Add minimal sparse handler and split images up based on sparse chunks when flashing if the image is too big#4

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Add minimal sparse handler and split images up based on sparse chunks when flashing if the image is too big #4

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dbdcaa4
Add minimal sparse handler
halal-beef Dec 13, 2025
cbd3359
Add sparse splitting support to flashing command
halal-beef Dec 13, 2025
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186 changes: 186 additions & 0 deletions FastBootCommands.cs
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Original file line numberDiff line numberDiff line change
Expand Up@@ -21,9 +21,12 @@
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography.Xml;
using static FastBoot.Sparse;

namespace FastBoot
{
Expand DownExpand Up@@ -264,6 +267,189 @@ public static bool RebootBootloader(this FastBootTransport fastBootTransport)
public static bool FlashPartition(this FastBootTransport fastBootTransport, string partition, Stream stream)
{
FastBootStatus status;
uint maxDownloadSize = 0;
string deviceResponse;

if(!GetVariable(fastBootTransport, "max-download-size", out deviceResponse)) return false;
maxDownloadSize = Convert.ToUInt32(deviceResponse);

if (stream.Length > maxDownloadSize)
{
byte[] image_magic = new byte[4];

try
{
stream.Read(image_magic, 0, 4);
if(BitConverter.ToUInt32(image_magic) == Sparse.sparse_magic)
{
byte[] sparseFileHeaderBuffer = new byte[28];
byte[] sparseChunkHeaderBuffer = new byte[12];
sparseFileHeader fileHeader;

List<byte[]> chunks = new();
uint blockPosition = 0;
int availableSpace;

stream.Position = 0;

stream.ReadExactly(sparseFileHeaderBuffer, 0, 28);
fileHeader = ReadSparseFileHeader(sparseFileHeaderBuffer);
availableSpace = (int)maxDownloadSize - (int)fileHeader.fileHeaderSize;

for (int i = 0; i < fileHeader.totalChunks; i++)
{
stream.ReadExactly(sparseChunkHeaderBuffer, 0, 12);
sparseChunkHeader chunkHeader = ReadSparseChunkHeader(sparseChunkHeaderBuffer);

if (chunkHeader.totalSize > availableSpace && chunks.Count > 0)
{
sparseFileHeader newFileHeader = fileHeader;
int offset = fileHeader.fileHeaderSize;

uint padding_blocks = fileHeader.totalBlocks - blockPosition;
if (padding_blocks > 0)
{
sparseChunkHeader dummyChunk = new sparseChunkHeader
{
chunkType = (ushort)chunkTypes.DONT_CARE,
reserved = 0,
chunkSize = padding_blocks,
totalSize = fileHeader.chunkHeaderSize
};
chunks.Add(ChunkHeaderToBytes(dummyChunk));
}

newFileHeader.totalChunks = (uint)chunks.Count;

byte[] fileBuffer = new byte[HeaderToBytes(newFileHeader).Length + chunks.Sum(chunk => chunk.Length)];
Buffer.BlockCopy(HeaderToBytes(newFileHeader), 0, fileBuffer, 0, 28);

foreach (byte[] chunk in chunks)
{
Buffer.BlockCopy(chunk, 0, fileBuffer, offset, chunk.Length);
offset += chunk.Length;
}

using (MemoryStream ms = new MemoryStream(fileBuffer))
{
try
{
(status, string _, byte[] _) = fastBootTransport.SendData(ms);
}
catch
{
return false;
}

if (status != FastBootStatus.OKAY)
{
return false;
}

try
{
(FastBootStatus status, string response, byte[] rawResponse)[] responses = fastBootTransport.SendCommand($"flash:{partition}");
(status, string _, byte[] _) = responses.Last();
}
catch
{
return false;
}

if (status != FastBootStatus.OKAY)
{
return false;
}
}

chunks.Clear();
availableSpace = (int)maxDownloadSize - (int)fileHeader.fileHeaderSize;

if (blockPosition > 0)
{
sparseChunkHeader dummyChunk = new sparseChunkHeader
{
chunkType = (ushort)chunkTypes.DONT_CARE,
reserved = 0,
chunkSize = blockPosition,
totalSize = fileHeader.chunkHeaderSize
};
chunks.Add(ChunkHeaderToBytes(dummyChunk));
availableSpace -= fileHeader.chunkHeaderSize;
}
}

byte[] chunk_data = new byte[chunkHeader.totalSize];
Buffer.BlockCopy(sparseChunkHeaderBuffer, 0, chunk_data, 0, 12);

int payload = (int)chunkHeader.totalSize - 12;
stream.ReadExactly(chunk_data, 12, payload);

chunks.Add(chunk_data);
blockPosition += chunkHeader.chunkSize;
availableSpace -= (int)chunkHeader.totalSize;
}

if (chunks.Count > 0)
{
sparseFileHeader newFileHeader = fileHeader;
int offset = fileHeader.fileHeaderSize;

newFileHeader.totalChunks = (uint)chunks.Count;

byte[] fileBuffer = new byte[HeaderToBytes(newFileHeader).Length + chunks.Sum(chunk => chunk.Length)];
Buffer.BlockCopy(HeaderToBytes(newFileHeader), 0, fileBuffer, 0, 28);

foreach (byte[] chunk in chunks)
{
Buffer.BlockCopy(chunk, 0, fileBuffer, offset, chunk.Length);
offset += chunk.Length;
}

using (MemoryStream ms = new MemoryStream(fileBuffer))
{
try
{
(status, string _, byte[] _) = fastBootTransport.SendData(ms);
}
catch
{
return false;
}

if (status != FastBootStatus.OKAY)
{
return false;
}

try
{
(FastBootStatus status, string response, byte[] rawResponse)[] responses = fastBootTransport.SendCommand($"flash:{partition}");
(status, string _, byte[] _) = responses.Last();
}
catch
{
return false;
}

if (status != FastBootStatus.OKAY)
{
return false;
}
}
}
return true;
}
else
{
return false; // TODO: Handle non-sparse but large images (most likely just converting them into raw chunks and sending them off).
}
}
catch
{
return false;
}
}

try
{
Expand Down
121 changes: 121 additions & 0 deletions Sparse.cs
View file
Open in desktop
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,121 @@
using System;
using System.IO;

namespace FastBoot
{
internal class Sparse
{
public static readonly uint sparse_magic = 0xED26FF3A;

public enum chunkTypes
{
RAW = 0xCAC1,
FILL,
DONT_CARE,
CRC32
}

public struct sparseFileHeader
{
public uint magic;
public ushort majorVersion;
public ushort minorVersion;
public ushort fileHeaderSize;
public ushort chunkHeaderSize;
public uint blockSize;
public uint totalBlocks;
public uint totalChunks;
public uint imageChecksum;
}

public struct sparseChunkHeader
{
public ushort chunkType;
public ushort reserved;
public uint chunkSize;
public uint totalSize;
}

private static void VerifySparseFileHeader(sparseFileHeader fileHeader)
{
if (fileHeader.magic != sparse_magic) throw new Exception("Invalid sparse magic");
if (fileHeader.majorVersion > 1) throw new Exception("Sparse format too new");
if (fileHeader.fileHeaderSize != 28 && fileHeader.majorVersion == 1) throw new Exception("Invalid file header size");
if (fileHeader.chunkHeaderSize != 12 && fileHeader.majorVersion == 1) throw new Exception("Invalid chunk header size");
if (fileHeader.blockSize % 4 != 0) throw new Exception("Invalid block size");
}

public static sparseFileHeader ReadSparseFileHeader(byte[] buffer)
{
sparseFileHeader fileHeader = new();

using (var ms = new MemoryStream(buffer))
using (var br = new BinaryReader(ms))
{
fileHeader.magic = br.ReadUInt32();
fileHeader.majorVersion = br.ReadUInt16();
fileHeader.minorVersion = br.ReadUInt16();
fileHeader.fileHeaderSize = br.ReadUInt16();
fileHeader.chunkHeaderSize = br.ReadUInt16();
fileHeader.blockSize = br.ReadUInt32();
fileHeader.totalBlocks = br.ReadUInt32();
fileHeader.totalChunks = br.ReadUInt32();
fileHeader.imageChecksum = br.ReadUInt32();
}

VerifySparseFileHeader(fileHeader);

return fileHeader;
}

public static sparseChunkHeader ReadSparseChunkHeader(byte[] buffer)
{
sparseChunkHeader chunk_header = new();

using (var ms = new MemoryStream(buffer))
using (var br = new BinaryReader(ms))
{
chunk_header.chunkType = br.ReadUInt16();
chunk_header.reserved = br.ReadUInt16();
chunk_header.chunkSize = br.ReadUInt32();
chunk_header.totalSize = br.ReadUInt32();
}
return chunk_header;
}

public static byte[] HeaderToBytes(sparseFileHeader fileHeader)
{
using (var ms = new MemoryStream())
using (var bw = new BinaryWriter(ms))
{
bw.Write(fileHeader.magic);
bw.Write(fileHeader.majorVersion);
bw.Write(fileHeader.minorVersion);
bw.Write(fileHeader.fileHeaderSize);
bw.Write(fileHeader.chunkHeaderSize);
bw.Write(fileHeader.blockSize);
bw.Write(fileHeader.totalBlocks);
bw.Write(fileHeader.totalChunks);
bw.Write(fileHeader.imageChecksum);

return ms.ToArray();
}
}

public static byte[] ChunkHeaderToBytes(sparseChunkHeader chunk)
{
if (chunk.chunkType != (uint)chunkTypes.DONT_CARE) throw new Exception("Only DONT_CARE chunks can be generated in this lib.");

using (var ms = new MemoryStream())
using (var bw = new BinaryWriter(ms))
{
bw.Write(chunk.chunkType);
bw.Write(chunk.reserved);
bw.Write(chunk.chunkSize);
bw.Write(chunk.totalSize);

return ms.ToArray();
}
}
}
}
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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Add minimal sparse handler and split images up based on sparse chunks when flashing if the image is too big#4

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 Open

halal-beef
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commits into

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Add minimal sparse handler and split images up based on sparse chunks when flashing if the image is too big
#4
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dbdcaa4

Add minimal sparse handler


halal-beef Dec 13, 2025
cbd3359

Add sparse splitting support to flashing command


halal-beef Dec 13, 2025

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186 changes: 186 additions & 0 deletions
FastBootCommands.cs

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -21,9 +21,12 @@
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography.Xml;
using static FastBoot.Sparse;

namespace FastBoot
{
Expand DownExpand Up@@ -264,6 +267,189 @@ public static bool RebootBootloader(this FastBootTransport fastBootTransport)
 public static bool FlashPartition(this FastBootTransport fastBootTransport, string partition, Stream stream)
 {
 FastBootStatus status;
 uint maxDownloadSize = 0;
 string deviceResponse;

 if(!GetVariable(fastBootTransport, "max-download-size", out deviceResponse)) return false;
 maxDownloadSize = Convert.ToUInt32(deviceResponse);

 if (stream.Length > maxDownloadSize)
 {
 byte[] image_magic = new byte[4];

 try
 {
 stream.Read(image_magic, 0, 4);
 if(BitConverter.ToUInt32(image_magic) == Sparse.sparse_magic)
 {
 byte[] sparseFileHeaderBuffer = new byte[28];
 byte[] sparseChunkHeaderBuffer = new byte[12];
 sparseFileHeader fileHeader;

 List<byte[]> chunks = new();
 uint blockPosition = 0;
 int availableSpace;

 stream.Position = 0;

 stream.ReadExactly(sparseFileHeaderBuffer, 0, 28);
 fileHeader = ReadSparseFileHeader(sparseFileHeaderBuffer);
 availableSpace = (int)maxDownloadSize - (int)fileHeader.fileHeaderSize;

 for (int i = 0; i < fileHeader.totalChunks; i++)
 {
 stream.ReadExactly(sparseChunkHeaderBuffer, 0, 12);
 sparseChunkHeader chunkHeader = ReadSparseChunkHeader(sparseChunkHeaderBuffer);

 if (chunkHeader.totalSize > availableSpace && chunks.Count > 0)
 {
 sparseFileHeader newFileHeader = fileHeader;
 int offset = fileHeader.fileHeaderSize;

 uint padding_blocks = fileHeader.totalBlocks - blockPosition;
 if (padding_blocks > 0)
 {
 sparseChunkHeader dummyChunk = new sparseChunkHeader
 {
 chunkType = (ushort)chunkTypes.DONT_CARE,
 reserved = 0,
 chunkSize = padding_blocks,
 totalSize = fileHeader.chunkHeaderSize
 };
 chunks.Add(ChunkHeaderToBytes(dummyChunk));
 }

 newFileHeader.totalChunks = (uint)chunks.Count;

 byte[] fileBuffer = new byte[HeaderToBytes(newFileHeader).Length + chunks.Sum(chunk => chunk.Length)];
 Buffer.BlockCopy(HeaderToBytes(newFileHeader), 0, fileBuffer, 0, 28);

 foreach (byte[] chunk in chunks)
 {
 Buffer.BlockCopy(chunk, 0, fileBuffer, offset, chunk.Length);
 offset += chunk.Length;
 }

 using (MemoryStream ms = new MemoryStream(fileBuffer))
 {
 try
 {
 (status, string _, byte[] _) = fastBootTransport.SendData(ms);
 }
 catch
 {
 return false;
 }

 if (status != FastBootStatus.OKAY)
 {
 return false;
 }

 try
 {
 (FastBootStatus status, string response, byte[] rawResponse)[] responses = fastBootTransport.SendCommand($"flash:{partition}");
 (status, string _, byte[] _) = responses.Last();
 }
 catch
 {
 return false;
 }

 if (status != FastBootStatus.OKAY)
 {
 return false;
 }
 }

 chunks.Clear();
 availableSpace = (int)maxDownloadSize - (int)fileHeader.fileHeaderSize;

 if (blockPosition > 0)
 {
 sparseChunkHeader dummyChunk = new sparseChunkHeader
 {
 chunkType = (ushort)chunkTypes.DONT_CARE,
 reserved = 0,
 chunkSize = blockPosition,
 totalSize = fileHeader.chunkHeaderSize
 };
 chunks.Add(ChunkHeaderToBytes(dummyChunk));
 availableSpace -= fileHeader.chunkHeaderSize;
 }
 }

 byte[] chunk_data = new byte[chunkHeader.totalSize];
 Buffer.BlockCopy(sparseChunkHeaderBuffer, 0, chunk_data, 0, 12);

 int payload = (int)chunkHeader.totalSize - 12;
 stream.ReadExactly(chunk_data, 12, payload);

 chunks.Add(chunk_data);
 blockPosition += chunkHeader.chunkSize;
 availableSpace -= (int)chunkHeader.totalSize;
 }

 if (chunks.Count > 0)
 {
 sparseFileHeader newFileHeader = fileHeader;
 int offset = fileHeader.fileHeaderSize;

 newFileHeader.totalChunks = (uint)chunks.Count;

 byte[] fileBuffer = new byte[HeaderToBytes(newFileHeader).Length + chunks.Sum(chunk => chunk.Length)];
 Buffer.BlockCopy(HeaderToBytes(newFileHeader), 0, fileBuffer, 0, 28);

 foreach (byte[] chunk in chunks)
 {
 Buffer.BlockCopy(chunk, 0, fileBuffer, offset, chunk.Length);
 offset += chunk.Length;
 }

 using (MemoryStream ms = new MemoryStream(fileBuffer))
 {
 try
 {
 (status, string _, byte[] _) = fastBootTransport.SendData(ms);
 }
 catch
 {
 return false;
 }

 if (status != FastBootStatus.OKAY)
 {
 return false;
 }

 try
 {
 (FastBootStatus status, string response, byte[] rawResponse)[] responses = fastBootTransport.SendCommand($"flash:{partition}");
 (status, string _, byte[] _) = responses.Last();
 }
 catch
 {
 return false;
 }

 if (status != FastBootStatus.OKAY)
 {
 return false;
 }
 }
 }
 return true;
 }
 else
 {
 return false; // TODO: Handle non-sparse but large images (most likely just converting them into raw chunks and sending them off).
 }
 }
 catch
 {
 return false;
 }
 }

 try
 {
Expand Down

121 changes: 121 additions & 0 deletions
Sparse.cs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -0,0 +1,121 @@
using System;
using System.IO;

namespace FastBoot
{
 internal class Sparse
 {
 public static readonly uint sparse_magic = 0xED26FF3A;

 public enum chunkTypes
 {
 RAW = 0xCAC1,
 FILL,
 DONT_CARE,
 CRC32
 }

 public struct sparseFileHeader
 {
 public uint magic;
 public ushort majorVersion;
 public ushort minorVersion;
 public ushort fileHeaderSize;
 public ushort chunkHeaderSize;
 public uint blockSize;
 public uint totalBlocks;
 public uint totalChunks;
 public uint imageChecksum;
 }

 public struct sparseChunkHeader
 {
 public ushort chunkType;
 public ushort reserved;
 public uint chunkSize;
 public uint totalSize;
 }

 private static void VerifySparseFileHeader(sparseFileHeader fileHeader)
 {
 if (fileHeader.magic != sparse_magic) throw new Exception("Invalid sparse magic");
 if (fileHeader.majorVersion > 1) throw new Exception("Sparse format too new");
 if (fileHeader.fileHeaderSize != 28 && fileHeader.majorVersion == 1) throw new Exception("Invalid file header size");
 if (fileHeader.chunkHeaderSize != 12 && fileHeader.majorVersion == 1) throw new Exception("Invalid chunk header size");
 if (fileHeader.blockSize % 4 != 0) throw new Exception("Invalid block size");
 }

 public static sparseFileHeader ReadSparseFileHeader(byte[] buffer)
 {
 sparseFileHeader fileHeader = new();

 using (var ms = new MemoryStream(buffer))
 using (var br = new BinaryReader(ms))
 {
 fileHeader.magic = br.ReadUInt32();
 fileHeader.majorVersion = br.ReadUInt16();
 fileHeader.minorVersion = br.ReadUInt16();
 fileHeader.fileHeaderSize = br.ReadUInt16();
 fileHeader.chunkHeaderSize = br.ReadUInt16();
 fileHeader.blockSize = br.ReadUInt32();
 fileHeader.totalBlocks = br.ReadUInt32();
 fileHeader.totalChunks = br.ReadUInt32();
 fileHeader.imageChecksum = br.ReadUInt32();
 }

 VerifySparseFileHeader(fileHeader);

 return fileHeader;
 }

 public static sparseChunkHeader ReadSparseChunkHeader(byte[] buffer)
 {
 sparseChunkHeader chunk_header = new();

 using (var ms = new MemoryStream(buffer))
 using (var br = new BinaryReader(ms))
 {
 chunk_header.chunkType = br.ReadUInt16();
 chunk_header.reserved = br.ReadUInt16();
 chunk_header.chunkSize = br.ReadUInt32();
 chunk_header.totalSize = br.ReadUInt32();
 }
 return chunk_header;
 }

 public static byte[] HeaderToBytes(sparseFileHeader fileHeader)
 {
 using (var ms = new MemoryStream())
 using (var bw = new BinaryWriter(ms))
 {
 bw.Write(fileHeader.magic);
 bw.Write(fileHeader.majorVersion);
 bw.Write(fileHeader.minorVersion);
 bw.Write(fileHeader.fileHeaderSize);
 bw.Write(fileHeader.chunkHeaderSize);
 bw.Write(fileHeader.blockSize);
 bw.Write(fileHeader.totalBlocks);
 bw.Write(fileHeader.totalChunks);
 bw.Write(fileHeader.imageChecksum);

 return ms.ToArray();
 }
 }

 public static byte[] ChunkHeaderToBytes(sparseChunkHeader chunk)
 {
 if (chunk.chunkType != (uint)chunkTypes.DONT_CARE) throw new Exception("Only DONT_CARE chunks can be generated in this lib.");

 using (var ms = new MemoryStream())
 using (var bw = new BinaryWriter(ms))
 {
 bw.Write(chunk.chunkType);
 bw.Write(chunk.reserved);
 bw.Write(chunk.chunkSize);
 bw.Write(chunk.totalSize);

 return ms.ToArray();
 }
 }
 }
}

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Add minimal sparse handler and split images up based on sparse chunks when flashing if the image is too big#4

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halal-beef
wants to merge
2
commits into

base:main
Choose a base branch

from

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Add minimal sparse handler and split images up based on sparse chunks when flashing if the image is too big
#4
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dbdcaa4

Add minimal sparse handler


halal-beef Dec 13, 2025
cbd3359

Add sparse splitting support to flashing command


halal-beef Dec 13, 2025

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186 changes: 186 additions & 0 deletions
FastBootCommands.cs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -21,9 +21,12 @@
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography.Xml;
using static FastBoot.Sparse;

namespace FastBoot
{
Expand DownExpand Up@@ -264,6 +267,189 @@ public static bool RebootBootloader(this FastBootTransport fastBootTransport)
 public static bool FlashPartition(this FastBootTransport fastBootTransport, string partition, Stream stream)
 {
 FastBootStatus status;
 uint maxDownloadSize = 0;
 string deviceResponse;

 if(!GetVariable(fastBootTransport, "max-download-size", out deviceResponse)) return false;
 maxDownloadSize = Convert.ToUInt32(deviceResponse);

 if (stream.Length > maxDownloadSize)
 {
 byte[] image_magic = new byte[4];

 try
 {
 stream.Read(image_magic, 0, 4);
 if(BitConverter.ToUInt32(image_magic) == Sparse.sparse_magic)
 {
 byte[] sparseFileHeaderBuffer = new byte[28];
 byte[] sparseChunkHeaderBuffer = new byte[12];
 sparseFileHeader fileHeader;

 List<byte[]> chunks = new();
 uint blockPosition = 0;
 int availableSpace;

 stream.Position = 0;

 stream.ReadExactly(sparseFileHeaderBuffer, 0, 28);
 fileHeader = ReadSparseFileHeader(sparseFileHeaderBuffer);
 availableSpace = (int)maxDownloadSize - (int)fileHeader.fileHeaderSize;

 for (int i = 0; i < fileHeader.totalChunks; i++)
 {
 stream.ReadExactly(sparseChunkHeaderBuffer, 0, 12);
 sparseChunkHeader chunkHeader = ReadSparseChunkHeader(sparseChunkHeaderBuffer);

 if (chunkHeader.totalSize > availableSpace && chunks.Count > 0)
 {
 sparseFileHeader newFileHeader = fileHeader;
 int offset = fileHeader.fileHeaderSize;

 uint padding_blocks = fileHeader.totalBlocks - blockPosition;
 if (padding_blocks > 0)
 {
 sparseChunkHeader dummyChunk = new sparseChunkHeader
 {
 chunkType = (ushort)chunkTypes.DONT_CARE,
 reserved = 0,
 chunkSize = padding_blocks,
 totalSize = fileHeader.chunkHeaderSize
 };
 chunks.Add(ChunkHeaderToBytes(dummyChunk));
 }

 newFileHeader.totalChunks = (uint)chunks.Count;

 byte[] fileBuffer = new byte[HeaderToBytes(newFileHeader).Length + chunks.Sum(chunk => chunk.Length)];
 Buffer.BlockCopy(HeaderToBytes(newFileHeader), 0, fileBuffer, 0, 28);

 foreach (byte[] chunk in chunks)
 {
 Buffer.BlockCopy(chunk, 0, fileBuffer, offset, chunk.Length);
 offset += chunk.Length;
 }

 using (MemoryStream ms = new MemoryStream(fileBuffer))
 {
 try
 {
 (status, string _, byte[] _) = fastBootTransport.SendData(ms);
 }
 catch
 {
 return false;
 }

 if (status != FastBootStatus.OKAY)
 {
 return false;
 }

 try
 {
 (FastBootStatus status, string response, byte[] rawResponse)[] responses = fastBootTransport.SendCommand($"flash:{partition}");
 (status, string _, byte[] _) = responses.Last();
 }
 catch
 {
 return false;
 }

 if (status != FastBootStatus.OKAY)
 {
 return false;
 }
 }

 chunks.Clear();
 availableSpace = (int)maxDownloadSize - (int)fileHeader.fileHeaderSize;

 if (blockPosition > 0)
 {
 sparseChunkHeader dummyChunk = new sparseChunkHeader
 {
 chunkType = (ushort)chunkTypes.DONT_CARE,
 reserved = 0,
 chunkSize = blockPosition,
 totalSize = fileHeader.chunkHeaderSize
 };
 chunks.Add(ChunkHeaderToBytes(dummyChunk));
 availableSpace -= fileHeader.chunkHeaderSize;
 }
 }

 byte[] chunk_data = new byte[chunkHeader.totalSize];
 Buffer.BlockCopy(sparseChunkHeaderBuffer, 0, chunk_data, 0, 12);

 int payload = (int)chunkHeader.totalSize - 12;
 stream.ReadExactly(chunk_data, 12, payload);

 chunks.Add(chunk_data);
 blockPosition += chunkHeader.chunkSize;
 availableSpace -= (int)chunkHeader.totalSize;
 }

 if (chunks.Count > 0)
 {
 sparseFileHeader newFileHeader = fileHeader;
 int offset = fileHeader.fileHeaderSize;

 newFileHeader.totalChunks = (uint)chunks.Count;

 byte[] fileBuffer = new byte[HeaderToBytes(newFileHeader).Length + chunks.Sum(chunk => chunk.Length)];
 Buffer.BlockCopy(HeaderToBytes(newFileHeader), 0, fileBuffer, 0, 28);

 foreach (byte[] chunk in chunks)
 {
 Buffer.BlockCopy(chunk, 0, fileBuffer, offset, chunk.Length);
 offset += chunk.Length;
 }

 using (MemoryStream ms = new MemoryStream(fileBuffer))
 {
 try
 {
 (status, string _, byte[] _) = fastBootTransport.SendData(ms);
 }
 catch
 {
 return false;
 }

 if (status != FastBootStatus.OKAY)
 {
 return false;
 }

 try
 {
 (FastBootStatus status, string response, byte[] rawResponse)[] responses = fastBootTransport.SendCommand($"flash:{partition}");
 (status, string _, byte[] _) = responses.Last();
 }
 catch
 {
 return false;
 }

 if (status != FastBootStatus.OKAY)
 {
 return false;
 }
 }
 }
 return true;
 }
 else
 {
 return false; // TODO: Handle non-sparse but large images (most likely just converting them into raw chunks and sending them off).
 }
 }
 catch
 {
 return false;
 }
 }

 try
 {
Expand Down

121 changes: 121 additions & 0 deletions
Sparse.cs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -0,0 +1,121 @@
using System;
using System.IO;

namespace FastBoot
{
 internal class Sparse
 {
 public static readonly uint sparse_magic = 0xED26FF3A;

 public enum chunkTypes
 {
 RAW = 0xCAC1,
 FILL,
 DONT_CARE,
 CRC32
 }

 public struct sparseFileHeader
 {
 public uint magic;
 public ushort majorVersion;
 public ushort minorVersion;
 public ushort fileHeaderSize;
 public ushort chunkHeaderSize;
 public uint blockSize;
 public uint totalBlocks;
 public uint totalChunks;
 public uint imageChecksum;
 }

 public struct sparseChunkHeader
 {
 public ushort chunkType;
 public ushort reserved;
 public uint chunkSize;
 public uint totalSize;
 }

 private static void VerifySparseFileHeader(sparseFileHeader fileHeader)
 {
 if (fileHeader.magic != sparse_magic) throw new Exception("Invalid sparse magic");
 if (fileHeader.majorVersion > 1) throw new Exception("Sparse format too new");
 if (fileHeader.fileHeaderSize != 28 && fileHeader.majorVersion == 1) throw new Exception("Invalid file header size");
 if (fileHeader.chunkHeaderSize != 12 && fileHeader.majorVersion == 1) throw new Exception("Invalid chunk header size");
 if (fileHeader.blockSize % 4 != 0) throw new Exception("Invalid block size");
 }

 public static sparseFileHeader ReadSparseFileHeader(byte[] buffer)
 {
 sparseFileHeader fileHeader = new();

 using (var ms = new MemoryStream(buffer))
 using (var br = new BinaryReader(ms))
 {
 fileHeader.magic = br.ReadUInt32();
 fileHeader.majorVersion = br.ReadUInt16();
 fileHeader.minorVersion = br.ReadUInt16();
 fileHeader.fileHeaderSize = br.ReadUInt16();
 fileHeader.chunkHeaderSize = br.ReadUInt16();
 fileHeader.blockSize = br.ReadUInt32();
 fileHeader.totalBlocks = br.ReadUInt32();
 fileHeader.totalChunks = br.ReadUInt32();
 fileHeader.imageChecksum = br.ReadUInt32();
 }

 VerifySparseFileHeader(fileHeader);

 return fileHeader;
 }

 public static sparseChunkHeader ReadSparseChunkHeader(byte[] buffer)
 {
 sparseChunkHeader chunk_header = new();

 using (var ms = new MemoryStream(buffer))
 using (var br = new BinaryReader(ms))
 {
 chunk_header.chunkType = br.ReadUInt16();
 chunk_header.reserved = br.ReadUInt16();
 chunk_header.chunkSize = br.ReadUInt32();
 chunk_header.totalSize = br.ReadUInt32();
 }
 return chunk_header;
 }

 public static byte[] HeaderToBytes(sparseFileHeader fileHeader)
 {
 using (var ms = new MemoryStream())
 using (var bw = new BinaryWriter(ms))
 {
 bw.Write(fileHeader.magic);
 bw.Write(fileHeader.majorVersion);
 bw.Write(fileHeader.minorVersion);
 bw.Write(fileHeader.fileHeaderSize);
 bw.Write(fileHeader.chunkHeaderSize);
 bw.Write(fileHeader.blockSize);
 bw.Write(fileHeader.totalBlocks);
 bw.Write(fileHeader.totalChunks);
 bw.Write(fileHeader.imageChecksum);

 return ms.ToArray();
 }
 }

 public static byte[] ChunkHeaderToBytes(sparseChunkHeader chunk)
 {
 if (chunk.chunkType != (uint)chunkTypes.DONT_CARE) throw new Exception("Only DONT_CARE chunks can be generated in this lib.");

 using (var ms = new MemoryStream())
 using (var bw = new BinaryWriter(ms))
 {
 bw.Write(chunk.chunkType);
 bw.Write(chunk.reserved);
 bw.Write(chunk.chunkSize);
 bw.Write(chunk.totalSize);

 return ms.ToArray();
 }
 }
 }
}

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Add minimal sparse handler and split images up based on sparse chunks when flashing if the image is too big#4

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Add minimal sparse handler and split images up based on sparse chunks when flashing if the image is too big
#4
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dbdcaa4

Add minimal sparse handler


halal-beef Dec 13, 2025
cbd3359

Add sparse splitting support to flashing command


halal-beef Dec 13, 2025

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186 changes: 186 additions & 0 deletions
FastBootCommands.cs

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -21,9 +21,12 @@
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography.Xml;
using static FastBoot.Sparse;

namespace FastBoot
{
Expand DownExpand Up@@ -264,6 +267,189 @@ public static bool RebootBootloader(this FastBootTransport fastBootTransport)
 public static bool FlashPartition(this FastBootTransport fastBootTransport, string partition, Stream stream)
 {
 FastBootStatus status;
 uint maxDownloadSize = 0;
 string deviceResponse;

 if(!GetVariable(fastBootTransport, "max-download-size", out deviceResponse)) return false;
 maxDownloadSize = Convert.ToUInt32(deviceResponse);

 if (stream.Length > maxDownloadSize)
 {
 byte[] image_magic = new byte[4];

 try
 {
 stream.Read(image_magic, 0, 4);
 if(BitConverter.ToUInt32(image_magic) == Sparse.sparse_magic)
 {
 byte[] sparseFileHeaderBuffer = new byte[28];
 byte[] sparseChunkHeaderBuffer = new byte[12];
 sparseFileHeader fileHeader;

 List<byte[]> chunks = new();
 uint blockPosition = 0;
 int availableSpace;

 stream.Position = 0;

 stream.ReadExactly(sparseFileHeaderBuffer, 0, 28);
 fileHeader = ReadSparseFileHeader(sparseFileHeaderBuffer);
 availableSpace = (int)maxDownloadSize - (int)fileHeader.fileHeaderSize;

 for (int i = 0; i < fileHeader.totalChunks; i++)
 {
 stream.ReadExactly(sparseChunkHeaderBuffer, 0, 12);
 sparseChunkHeader chunkHeader = ReadSparseChunkHeader(sparseChunkHeaderBuffer);

 if (chunkHeader.totalSize > availableSpace && chunks.Count > 0)
 {
 sparseFileHeader newFileHeader = fileHeader;
 int offset = fileHeader.fileHeaderSize;

 uint padding_blocks = fileHeader.totalBlocks - blockPosition;
 if (padding_blocks > 0)
 {
 sparseChunkHeader dummyChunk = new sparseChunkHeader
 {
 chunkType = (ushort)chunkTypes.DONT_CARE,
 reserved = 0,
 chunkSize = padding_blocks,
 totalSize = fileHeader.chunkHeaderSize
 };
 chunks.Add(ChunkHeaderToBytes(dummyChunk));
 }

 newFileHeader.totalChunks = (uint)chunks.Count;

 byte[] fileBuffer = new byte[HeaderToBytes(newFileHeader).Length + chunks.Sum(chunk => chunk.Length)];
 Buffer.BlockCopy(HeaderToBytes(newFileHeader), 0, fileBuffer, 0, 28);

 foreach (byte[] chunk in chunks)
 {
 Buffer.BlockCopy(chunk, 0, fileBuffer, offset, chunk.Length);
 offset += chunk.Length;
 }

 using (MemoryStream ms = new MemoryStream(fileBuffer))
 {
 try
 {
 (status, string _, byte[] _) = fastBootTransport.SendData(ms);
 }
 catch
 {
 return false;
 }

 if (status != FastBootStatus.OKAY)
 {
 return false;
 }

 try
 {
 (FastBootStatus status, string response, byte[] rawResponse)[] responses = fastBootTransport.SendCommand($"flash:{partition}");
 (status, string _, byte[] _) = responses.Last();
 }
 catch
 {
 return false;
 }

 if (status != FastBootStatus.OKAY)
 {
 return false;
 }
 }

 chunks.Clear();
 availableSpace = (int)maxDownloadSize - (int)fileHeader.fileHeaderSize;

 if (blockPosition > 0)
 {
 sparseChunkHeader dummyChunk = new sparseChunkHeader
 {
 chunkType = (ushort)chunkTypes.DONT_CARE,
 reserved = 0,
 chunkSize = blockPosition,
 totalSize = fileHeader.chunkHeaderSize
 };
 chunks.Add(ChunkHeaderToBytes(dummyChunk));
 availableSpace -= fileHeader.chunkHeaderSize;
 }
 }

 byte[] chunk_data = new byte[chunkHeader.totalSize];
 Buffer.BlockCopy(sparseChunkHeaderBuffer, 0, chunk_data, 0, 12);

 int payload = (int)chunkHeader.totalSize - 12;
 stream.ReadExactly(chunk_data, 12, payload);

 chunks.Add(chunk_data);
 blockPosition += chunkHeader.chunkSize;
 availableSpace -= (int)chunkHeader.totalSize;
 }

 if (chunks.Count > 0)
 {
 sparseFileHeader newFileHeader = fileHeader;
 int offset = fileHeader.fileHeaderSize;

 newFileHeader.totalChunks = (uint)chunks.Count;

 byte[] fileBuffer = new byte[HeaderToBytes(newFileHeader).Length + chunks.Sum(chunk => chunk.Length)];
 Buffer.BlockCopy(HeaderToBytes(newFileHeader), 0, fileBuffer, 0, 28);

 foreach (byte[] chunk in chunks)
 {
 Buffer.BlockCopy(chunk, 0, fileBuffer, offset, chunk.Length);
 offset += chunk.Length;
 }

 using (MemoryStream ms = new MemoryStream(fileBuffer))
 {
 try
 {
 (status, string _, byte[] _) = fastBootTransport.SendData(ms);
 }
 catch
 {
 return false;
 }

 if (status != FastBootStatus.OKAY)
 {
 return false;
 }

 try
 {
 (FastBootStatus status, string response, byte[] rawResponse)[] responses = fastBootTransport.SendCommand($"flash:{partition}");
 (status, string _, byte[] _) = responses.Last();
 }
 catch
 {
 return false;
 }

 if (status != FastBootStatus.OKAY)
 {
 return false;
 }
 }
 }
 return true;
 }
 else
 {
 return false; // TODO: Handle non-sparse but large images (most likely just converting them into raw chunks and sending them off).
 }
 }
 catch
 {
 return false;
 }
 }

 try
 {
Expand Down

121 changes: 121 additions & 0 deletions
Sparse.cs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -0,0 +1,121 @@
using System;
using System.IO;

namespace FastBoot
{
 internal class Sparse
 {
 public static readonly uint sparse_magic = 0xED26FF3A;

 public enum chunkTypes
 {
 RAW = 0xCAC1,
 FILL,
 DONT_CARE,
 CRC32
 }

 public struct sparseFileHeader
 {
 public uint magic;
 public ushort majorVersion;
 public ushort minorVersion;
 public ushort fileHeaderSize;
 public ushort chunkHeaderSize;
 public uint blockSize;
 public uint totalBlocks;
 public uint totalChunks;
 public uint imageChecksum;
 }

 public struct sparseChunkHeader
 {
 public ushort chunkType;
 public ushort reserved;
 public uint chunkSize;
 public uint totalSize;
 }

 private static void VerifySparseFileHeader(sparseFileHeader fileHeader)
 {
 if (fileHeader.magic != sparse_magic) throw new Exception("Invalid sparse magic");
 if (fileHeader.majorVersion > 1) throw new Exception("Sparse format too new");
 if (fileHeader.fileHeaderSize != 28 && fileHeader.majorVersion == 1) throw new Exception("Invalid file header size");
 if (fileHeader.chunkHeaderSize != 12 && fileHeader.majorVersion == 1) throw new Exception("Invalid chunk header size");
 if (fileHeader.blockSize % 4 != 0) throw new Exception("Invalid block size");
 }

 public static sparseFileHeader ReadSparseFileHeader(byte[] buffer)
 {
 sparseFileHeader fileHeader = new();

 using (var ms = new MemoryStream(buffer))
 using (var br = new BinaryReader(ms))
 {
 fileHeader.magic = br.ReadUInt32();
 fileHeader.majorVersion = br.ReadUInt16();
 fileHeader.minorVersion = br.ReadUInt16();
 fileHeader.fileHeaderSize = br.ReadUInt16();
 fileHeader.chunkHeaderSize = br.ReadUInt16();
 fileHeader.blockSize = br.ReadUInt32();
 fileHeader.totalBlocks = br.ReadUInt32();
 fileHeader.totalChunks = br.ReadUInt32();
 fileHeader.imageChecksum = br.ReadUInt32();
 }

 VerifySparseFileHeader(fileHeader);

 return fileHeader;
 }

 public static sparseChunkHeader ReadSparseChunkHeader(byte[] buffer)
 {
 sparseChunkHeader chunk_header = new();

 using (var ms = new MemoryStream(buffer))
 using (var br = new BinaryReader(ms))
 {
 chunk_header.chunkType = br.ReadUInt16();
 chunk_header.reserved = br.ReadUInt16();
 chunk_header.chunkSize = br.ReadUInt32();
 chunk_header.totalSize = br.ReadUInt32();
 }
 return chunk_header;
 }

 public static byte[] HeaderToBytes(sparseFileHeader fileHeader)
 {
 using (var ms = new MemoryStream())
 using (var bw = new BinaryWriter(ms))
 {
 bw.Write(fileHeader.magic);
 bw.Write(fileHeader.majorVersion);
 bw.Write(fileHeader.minorVersion);
 bw.Write(fileHeader.fileHeaderSize);
 bw.Write(fileHeader.chunkHeaderSize);
 bw.Write(fileHeader.blockSize);
 bw.Write(fileHeader.totalBlocks);
 bw.Write(fileHeader.totalChunks);
 bw.Write(fileHeader.imageChecksum);

 return ms.ToArray();
 }
 }

 public static byte[] ChunkHeaderToBytes(sparseChunkHeader chunk)
 {
 if (chunk.chunkType != (uint)chunkTypes.DONT_CARE) throw new Exception("Only DONT_CARE chunks can be generated in this lib.");

 using (var ms = new MemoryStream())
 using (var bw = new BinaryWriter(ms))
 {
 bw.Write(chunk.chunkType);
 bw.Write(chunk.reserved);
 bw.Write(chunk.chunkSize);
 bw.Write(chunk.totalSize);

 return ms.ToArray();
 }
 }
 }
}

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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Add minimal sparse handler and split images up based on sparse chunks when flashing if the image is too big#4

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halal-beef
wants to merge
2
commits into

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Choose a base branch

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Add minimal sparse handler and split images up based on sparse chunks when flashing if the image is too big
#4
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dbdcaa4

Add minimal sparse handler


halal-beef Dec 13, 2025
cbd3359

Add sparse splitting support to flashing command


halal-beef Dec 13, 2025

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186 changes: 186 additions & 0 deletions
FastBootCommands.cs

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -21,9 +21,12 @@
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography.Xml;
using static FastBoot.Sparse;

namespace FastBoot
{
Expand DownExpand Up@@ -264,6 +267,189 @@ public static bool RebootBootloader(this FastBootTransport fastBootTransport)
 public static bool FlashPartition(this FastBootTransport fastBootTransport, string partition, Stream stream)
 {
 FastBootStatus status;
 uint maxDownloadSize = 0;
 string deviceResponse;

 if(!GetVariable(fastBootTransport, "max-download-size", out deviceResponse)) return false;
 maxDownloadSize = Convert.ToUInt32(deviceResponse);

 if (stream.Length > maxDownloadSize)
 {
 byte[] image_magic = new byte[4];

 try
 {
 stream.Read(image_magic, 0, 4);
 if(BitConverter.ToUInt32(image_magic) == Sparse.sparse_magic)
 {
 byte[] sparseFileHeaderBuffer = new byte[28];
 byte[] sparseChunkHeaderBuffer = new byte[12];
 sparseFileHeader fileHeader;

 List<byte[]> chunks = new();
 uint blockPosition = 0;
 int availableSpace;

 stream.Position = 0;

 stream.ReadExactly(sparseFileHeaderBuffer, 0, 28);
 fileHeader = ReadSparseFileHeader(sparseFileHeaderBuffer);
 availableSpace = (int)maxDownloadSize - (int)fileHeader.fileHeaderSize;

 for (int i = 0; i < fileHeader.totalChunks; i++)
 {
 stream.ReadExactly(sparseChunkHeaderBuffer, 0, 12);
 sparseChunkHeader chunkHeader = ReadSparseChunkHeader(sparseChunkHeaderBuffer);

 if (chunkHeader.totalSize > availableSpace && chunks.Count > 0)
 {
 sparseFileHeader newFileHeader = fileHeader;
 int offset = fileHeader.fileHeaderSize;

 uint padding_blocks = fileHeader.totalBlocks - blockPosition;
 if (padding_blocks > 0)
 {
 sparseChunkHeader dummyChunk = new sparseChunkHeader
 {
 chunkType = (ushort)chunkTypes.DONT_CARE,
 reserved = 0,
 chunkSize = padding_blocks,
 totalSize = fileHeader.chunkHeaderSize
 };
 chunks.Add(ChunkHeaderToBytes(dummyChunk));
 }

 newFileHeader.totalChunks = (uint)chunks.Count;

 byte[] fileBuffer = new byte[HeaderToBytes(newFileHeader).Length + chunks.Sum(chunk => chunk.Length)];
 Buffer.BlockCopy(HeaderToBytes(newFileHeader), 0, fileBuffer, 0, 28);

 foreach (byte[] chunk in chunks)
 {
 Buffer.BlockCopy(chunk, 0, fileBuffer, offset, chunk.Length);
 offset += chunk.Length;
 }

 using (MemoryStream ms = new MemoryStream(fileBuffer))
 {
 try
 {
 (status, string _, byte[] _) = fastBootTransport.SendData(ms);
 }
 catch
 {
 return false;
 }

 if (status != FastBootStatus.OKAY)
 {
 return false;
 }

 try
 {
 (FastBootStatus status, string response, byte[] rawResponse)[] responses = fastBootTransport.SendCommand($"flash:{partition}");
 (status, string _, byte[] _) = responses.Last();
 }
 catch
 {
 return false;
 }

 if (status != FastBootStatus.OKAY)
 {
 return false;
 }
 }

 chunks.Clear();
 availableSpace = (int)maxDownloadSize - (int)fileHeader.fileHeaderSize;

 if (blockPosition > 0)
 {
 sparseChunkHeader dummyChunk = new sparseChunkHeader
 {
 chunkType = (ushort)chunkTypes.DONT_CARE,
 reserved = 0,
 chunkSize = blockPosition,
 totalSize = fileHeader.chunkHeaderSize
 };
 chunks.Add(ChunkHeaderToBytes(dummyChunk));
 availableSpace -= fileHeader.chunkHeaderSize;
 }
 }

 byte[] chunk_data = new byte[chunkHeader.totalSize];
 Buffer.BlockCopy(sparseChunkHeaderBuffer, 0, chunk_data, 0, 12);

 int payload = (int)chunkHeader.totalSize - 12;
 stream.ReadExactly(chunk_data, 12, payload);

 chunks.Add(chunk_data);
 blockPosition += chunkHeader.chunkSize;
 availableSpace -= (int)chunkHeader.totalSize;
 }

 if (chunks.Count > 0)
 {
 sparseFileHeader newFileHeader = fileHeader;
 int offset = fileHeader.fileHeaderSize;

 newFileHeader.totalChunks = (uint)chunks.Count;

 byte[] fileBuffer = new byte[HeaderToBytes(newFileHeader).Length + chunks.Sum(chunk => chunk.Length)];
 Buffer.BlockCopy(HeaderToBytes(newFileHeader), 0, fileBuffer, 0, 28);

 foreach (byte[] chunk in chunks)
 {
 Buffer.BlockCopy(chunk, 0, fileBuffer, offset, chunk.Length);
 offset += chunk.Length;
 }

 using (MemoryStream ms = new MemoryStream(fileBuffer))
 {
 try
 {
 (status, string _, byte[] _) = fastBootTransport.SendData(ms);
 }
 catch
 {
 return false;
 }

 if (status != FastBootStatus.OKAY)
 {
 return false;
 }

 try
 {
 (FastBootStatus status, string response, byte[] rawResponse)[] responses = fastBootTransport.SendCommand($"flash:{partition}");
 (status, string _, byte[] _) = responses.Last();
 }
 catch
 {
 return false;
 }

 if (status != FastBootStatus.OKAY)
 {
 return false;
 }
 }
 }
 return true;
 }
 else
 {
 return false; // TODO: Handle non-sparse but large images (most likely just converting them into raw chunks and sending them off).
 }
 }
 catch
 {
 return false;
 }
 }

 try
 {
Expand Down

121 changes: 121 additions & 0 deletions
Sparse.cs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -0,0 +1,121 @@
using System;
using System.IO;

namespace FastBoot
{
 internal class Sparse
 {
 public static readonly uint sparse_magic = 0xED26FF3A;

 public enum chunkTypes
 {
 RAW = 0xCAC1,
 FILL,
 DONT_CARE,
 CRC32
 }

 public struct sparseFileHeader
 {
 public uint magic;
 public ushort majorVersion;
 public ushort minorVersion;
 public ushort fileHeaderSize;
 public ushort chunkHeaderSize;
 public uint blockSize;
 public uint totalBlocks;
 public uint totalChunks;
 public uint imageChecksum;
 }

 public struct sparseChunkHeader
 {
 public ushort chunkType;
 public ushort reserved;
 public uint chunkSize;
 public uint totalSize;
 }

 private static void VerifySparseFileHeader(sparseFileHeader fileHeader)
 {
 if (fileHeader.magic != sparse_magic) throw new Exception("Invalid sparse magic");
 if (fileHeader.majorVersion > 1) throw new Exception("Sparse format too new");
 if (fileHeader.fileHeaderSize != 28 && fileHeader.majorVersion == 1) throw new Exception("Invalid file header size");
 if (fileHeader.chunkHeaderSize != 12 && fileHeader.majorVersion == 1) throw new Exception("Invalid chunk header size");
 if (fileHeader.blockSize % 4 != 0) throw new Exception("Invalid block size");
 }

 public static sparseFileHeader ReadSparseFileHeader(byte[] buffer)
 {
 sparseFileHeader fileHeader = new();

 using (var ms = new MemoryStream(buffer))
 using (var br = new BinaryReader(ms))
 {
 fileHeader.magic = br.ReadUInt32();
 fileHeader.majorVersion = br.ReadUInt16();
 fileHeader.minorVersion = br.ReadUInt16();
 fileHeader.fileHeaderSize = br.ReadUInt16();
 fileHeader.chunkHeaderSize = br.ReadUInt16();
 fileHeader.blockSize = br.ReadUInt32();
 fileHeader.totalBlocks = br.ReadUInt32();
 fileHeader.totalChunks = br.ReadUInt32();
 fileHeader.imageChecksum = br.ReadUInt32();
 }

 VerifySparseFileHeader(fileHeader);

 return fileHeader;
 }

 public static sparseChunkHeader ReadSparseChunkHeader(byte[] buffer)
 {
 sparseChunkHeader chunk_header = new();

 using (var ms = new MemoryStream(buffer))
 using (var br = new BinaryReader(ms))
 {
 chunk_header.chunkType = br.ReadUInt16();
 chunk_header.reserved = br.ReadUInt16();
 chunk_header.chunkSize = br.ReadUInt32();
 chunk_header.totalSize = br.ReadUInt32();
 }
 return chunk_header;
 }

 public static byte[] HeaderToBytes(sparseFileHeader fileHeader)
 {
 using (var ms = new MemoryStream())
 using (var bw = new BinaryWriter(ms))
 {
 bw.Write(fileHeader.magic);
 bw.Write(fileHeader.majorVersion);
 bw.Write(fileHeader.minorVersion);
 bw.Write(fileHeader.fileHeaderSize);
 bw.Write(fileHeader.chunkHeaderSize);
 bw.Write(fileHeader.blockSize);
 bw.Write(fileHeader.totalBlocks);
 bw.Write(fileHeader.totalChunks);
 bw.Write(fileHeader.imageChecksum);

 return ms.ToArray();
 }
 }

 public static byte[] ChunkHeaderToBytes(sparseChunkHeader chunk)
 {
 if (chunk.chunkType != (uint)chunkTypes.DONT_CARE) throw new Exception("Only DONT_CARE chunks can be generated in this lib.");

 using (var ms = new MemoryStream())
 using (var bw = new BinaryWriter(ms))
 {
 bw.Write(chunk.chunkType);
 bw.Write(chunk.reserved);
 bw.Write(chunk.chunkSize);
 bw.Write(chunk.totalSize);

 return ms.ToArray();
 }
 }
 }
}

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Add minimal sparse handler and split images up based on sparse chunks when flashing if the image is too big#4

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Add minimal sparse handler and split images up based on sparse chunks when flashing if the image is too big
#4
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dbdcaa4

Add minimal sparse handler


halal-beef Dec 13, 2025
cbd3359

Add sparse splitting support to flashing command


halal-beef Dec 13, 2025

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186 changes: 186 additions & 0 deletions
FastBootCommands.cs

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -21,9 +21,12 @@
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography.Xml;
using static FastBoot.Sparse;

namespace FastBoot
{
Expand DownExpand Up@@ -264,6 +267,189 @@ public static bool RebootBootloader(this FastBootTransport fastBootTransport)
 public static bool FlashPartition(this FastBootTransport fastBootTransport, string partition, Stream stream)
 {
 FastBootStatus status;
 uint maxDownloadSize = 0;
 string deviceResponse;

 if(!GetVariable(fastBootTransport, "max-download-size", out deviceResponse)) return false;
 maxDownloadSize = Convert.ToUInt32(deviceResponse);

 if (stream.Length > maxDownloadSize)
 {
 byte[] image_magic = new byte[4];

 try
 {
 stream.Read(image_magic, 0, 4);
 if(BitConverter.ToUInt32(image_magic) == Sparse.sparse_magic)
 {
 byte[] sparseFileHeaderBuffer = new byte[28];
 byte[] sparseChunkHeaderBuffer = new byte[12];
 sparseFileHeader fileHeader;

 List<byte[]> chunks = new();
 uint blockPosition = 0;
 int availableSpace;

 stream.Position = 0;

 stream.ReadExactly(sparseFileHeaderBuffer, 0, 28);
 fileHeader = ReadSparseFileHeader(sparseFileHeaderBuffer);
 availableSpace = (int)maxDownloadSize - (int)fileHeader.fileHeaderSize;

 for (int i = 0; i < fileHeader.totalChunks; i++)
 {
 stream.ReadExactly(sparseChunkHeaderBuffer, 0, 12);
 sparseChunkHeader chunkHeader = ReadSparseChunkHeader(sparseChunkHeaderBuffer);

 if (chunkHeader.totalSize > availableSpace && chunks.Count > 0)
 {
 sparseFileHeader newFileHeader = fileHeader;
 int offset = fileHeader.fileHeaderSize;

 uint padding_blocks = fileHeader.totalBlocks - blockPosition;
 if (padding_blocks > 0)
 {
 sparseChunkHeader dummyChunk = new sparseChunkHeader
 {
 chunkType = (ushort)chunkTypes.DONT_CARE,
 reserved = 0,
 chunkSize = padding_blocks,
 totalSize = fileHeader.chunkHeaderSize
 };
 chunks.Add(ChunkHeaderToBytes(dummyChunk));
 }

 newFileHeader.totalChunks = (uint)chunks.Count;

 byte[] fileBuffer = new byte[HeaderToBytes(newFileHeader).Length + chunks.Sum(chunk => chunk.Length)];
 Buffer.BlockCopy(HeaderToBytes(newFileHeader), 0, fileBuffer, 0, 28);

 foreach (byte[] chunk in chunks)
 {
 Buffer.BlockCopy(chunk, 0, fileBuffer, offset, chunk.Length);
 offset += chunk.Length;
 }

 using (MemoryStream ms = new MemoryStream(fileBuffer))
 {
 try
 {
 (status, string _, byte[] _) = fastBootTransport.SendData(ms);
 }
 catch
 {
 return false;
 }

 if (status != FastBootStatus.OKAY)
 {
 return false;
 }

 try
 {
 (FastBootStatus status, string response, byte[] rawResponse)[] responses = fastBootTransport.SendCommand($"flash:{partition}");
 (status, string _, byte[] _) = responses.Last();
 }
 catch
 {
 return false;
 }

 if (status != FastBootStatus.OKAY)
 {
 return false;
 }
 }

 chunks.Clear();
 availableSpace = (int)maxDownloadSize - (int)fileHeader.fileHeaderSize;

 if (blockPosition > 0)
 {
 sparseChunkHeader dummyChunk = new sparseChunkHeader
 {
 chunkType = (ushort)chunkTypes.DONT_CARE,
 reserved = 0,
 chunkSize = blockPosition,
 totalSize = fileHeader.chunkHeaderSize
 };
 chunks.Add(ChunkHeaderToBytes(dummyChunk));
 availableSpace -= fileHeader.chunkHeaderSize;
 }
 }

 byte[] chunk_data = new byte[chunkHeader.totalSize];
 Buffer.BlockCopy(sparseChunkHeaderBuffer, 0, chunk_data, 0, 12);

 int payload = (int)chunkHeader.totalSize - 12;
 stream.ReadExactly(chunk_data, 12, payload);

 chunks.Add(chunk_data);
 blockPosition += chunkHeader.chunkSize;
 availableSpace -= (int)chunkHeader.totalSize;
 }

 if (chunks.Count > 0)
 {
 sparseFileHeader newFileHeader = fileHeader;
 int offset = fileHeader.fileHeaderSize;

 newFileHeader.totalChunks = (uint)chunks.Count;

 byte[] fileBuffer = new byte[HeaderToBytes(newFileHeader).Length + chunks.Sum(chunk => chunk.Length)];
 Buffer.BlockCopy(HeaderToBytes(newFileHeader), 0, fileBuffer, 0, 28);

 foreach (byte[] chunk in chunks)
 {
 Buffer.BlockCopy(chunk, 0, fileBuffer, offset, chunk.Length);
 offset += chunk.Length;
 }

 using (MemoryStream ms = new MemoryStream(fileBuffer))
 {
 try
 {
 (status, string _, byte[] _) = fastBootTransport.SendData(ms);
 }
 catch
 {
 return false;
 }

 if (status != FastBootStatus.OKAY)
 {
 return false;
 }

 try
 {
 (FastBootStatus status, string response, byte[] rawResponse)[] responses = fastBootTransport.SendCommand($"flash:{partition}");
 (status, string _, byte[] _) = responses.Last();
 }
 catch
 {
 return false;
 }

 if (status != FastBootStatus.OKAY)
 {
 return false;
 }
 }
 }
 return true;
 }
 else
 {
 return false; // TODO: Handle non-sparse but large images (most likely just converting them into raw chunks and sending them off).
 }
 }
 catch
 {
 return false;
 }
 }

 try
 {
Expand Down

121 changes: 121 additions & 0 deletions
Sparse.cs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -0,0 +1,121 @@
using System;
using System.IO;

namespace FastBoot
{
 internal class Sparse
 {
 public static readonly uint sparse_magic = 0xED26FF3A;

 public enum chunkTypes
 {
 RAW = 0xCAC1,
 FILL,
 DONT_CARE,
 CRC32
 }

 public struct sparseFileHeader
 {
 public uint magic;
 public ushort majorVersion;
 public ushort minorVersion;
 public ushort fileHeaderSize;
 public ushort chunkHeaderSize;
 public uint blockSize;
 public uint totalBlocks;
 public uint totalChunks;
 public uint imageChecksum;
 }

 public struct sparseChunkHeader
 {
 public ushort chunkType;
 public ushort reserved;
 public uint chunkSize;
 public uint totalSize;
 }

 private static void VerifySparseFileHeader(sparseFileHeader fileHeader)
 {
 if (fileHeader.magic != sparse_magic) throw new Exception("Invalid sparse magic");
 if (fileHeader.majorVersion > 1) throw new Exception("Sparse format too new");
 if (fileHeader.fileHeaderSize != 28 && fileHeader.majorVersion == 1) throw new Exception("Invalid file header size");
 if (fileHeader.chunkHeaderSize != 12 && fileHeader.majorVersion == 1) throw new Exception("Invalid chunk header size");
 if (fileHeader.blockSize % 4 != 0) throw new Exception("Invalid block size");
 }

 public static sparseFileHeader ReadSparseFileHeader(byte[] buffer)
 {
 sparseFileHeader fileHeader = new();

 using (var ms = new MemoryStream(buffer))
 using (var br = new BinaryReader(ms))
 {
 fileHeader.magic = br.ReadUInt32();
 fileHeader.majorVersion = br.ReadUInt16();
 fileHeader.minorVersion = br.ReadUInt16();
 fileHeader.fileHeaderSize = br.ReadUInt16();
 fileHeader.chunkHeaderSize = br.ReadUInt16();
 fileHeader.blockSize = br.ReadUInt32();
 fileHeader.totalBlocks = br.ReadUInt32();
 fileHeader.totalChunks = br.ReadUInt32();
 fileHeader.imageChecksum = br.ReadUInt32();
 }

 VerifySparseFileHeader(fileHeader);

 return fileHeader;
 }

 public static sparseChunkHeader ReadSparseChunkHeader(byte[] buffer)
 {
 sparseChunkHeader chunk_header = new();

 using (var ms = new MemoryStream(buffer))
 using (var br = new BinaryReader(ms))
 {
 chunk_header.chunkType = br.ReadUInt16();
 chunk_header.reserved = br.ReadUInt16();
 chunk_header.chunkSize = br.ReadUInt32();
 chunk_header.totalSize = br.ReadUInt32();
 }
 return chunk_header;
 }

 public static byte[] HeaderToBytes(sparseFileHeader fileHeader)
 {
 using (var ms = new MemoryStream())
 using (var bw = new BinaryWriter(ms))
 {
 bw.Write(fileHeader.magic);
 bw.Write(fileHeader.majorVersion);
 bw.Write(fileHeader.minorVersion);
 bw.Write(fileHeader.fileHeaderSize);
 bw.Write(fileHeader.chunkHeaderSize);
 bw.Write(fileHeader.blockSize);
 bw.Write(fileHeader.totalBlocks);
 bw.Write(fileHeader.totalChunks);
 bw.Write(fileHeader.imageChecksum);

 return ms.ToArray();
 }
 }

 public static byte[] ChunkHeaderToBytes(sparseChunkHeader chunk)
 {
 if (chunk.chunkType != (uint)chunkTypes.DONT_CARE) throw new Exception("Only DONT_CARE chunks can be generated in this lib.");

 using (var ms = new MemoryStream())
 using (var bw = new BinaryWriter(ms))
 {
 bw.Write(chunk.chunkType);
 bw.Write(chunk.reserved);
 bw.Write(chunk.chunkSize);
 bw.Write(chunk.totalSize);

 return ms.ToArray();
 }
 }
 }
}

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Add minimal sparse handler and split images up based on sparse chunks when flashing if the image is too big#4

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halal-beef
wants to merge
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Choose a base branch

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Add minimal sparse handler and split images up based on sparse chunks when flashing if the image is too big
#4
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dbdcaa4

Add minimal sparse handler


halal-beef Dec 13, 2025
cbd3359

Add sparse splitting support to flashing command


halal-beef Dec 13, 2025

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186 changes: 186 additions & 0 deletions
FastBootCommands.cs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -21,9 +21,12 @@
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography.Xml;
using static FastBoot.Sparse;

namespace FastBoot
{
Expand DownExpand Up@@ -264,6 +267,189 @@ public static bool RebootBootloader(this FastBootTransport fastBootTransport)
 public static bool FlashPartition(this FastBootTransport fastBootTransport, string partition, Stream stream)
 {
 FastBootStatus status;
 uint maxDownloadSize = 0;
 string deviceResponse;

 if(!GetVariable(fastBootTransport, "max-download-size", out deviceResponse)) return false;
 maxDownloadSize = Convert.ToUInt32(deviceResponse);

 if (stream.Length > maxDownloadSize)
 {
 byte[] image_magic = new byte[4];

 try
 {
 stream.Read(image_magic, 0, 4);
 if(BitConverter.ToUInt32(image_magic) == Sparse.sparse_magic)
 {
 byte[] sparseFileHeaderBuffer = new byte[28];
 byte[] sparseChunkHeaderBuffer = new byte[12];
 sparseFileHeader fileHeader;

 List<byte[]> chunks = new();
 uint blockPosition = 0;
 int availableSpace;

 stream.Position = 0;

 stream.ReadExactly(sparseFileHeaderBuffer, 0, 28);
 fileHeader = ReadSparseFileHeader(sparseFileHeaderBuffer);
 availableSpace = (int)maxDownloadSize - (int)fileHeader.fileHeaderSize;

 for (int i = 0; i < fileHeader.totalChunks; i++)
 {
 stream.ReadExactly(sparseChunkHeaderBuffer, 0, 12);
 sparseChunkHeader chunkHeader = ReadSparseChunkHeader(sparseChunkHeaderBuffer);

 if (chunkHeader.totalSize > availableSpace && chunks.Count > 0)
 {
 sparseFileHeader newFileHeader = fileHeader;
 int offset = fileHeader.fileHeaderSize;

 uint padding_blocks = fileHeader.totalBlocks - blockPosition;
 if (padding_blocks > 0)
 {
 sparseChunkHeader dummyChunk = new sparseChunkHeader
 {
 chunkType = (ushort)chunkTypes.DONT_CARE,
 reserved = 0,
 chunkSize = padding_blocks,
 totalSize = fileHeader.chunkHeaderSize
 };
 chunks.Add(ChunkHeaderToBytes(dummyChunk));
 }

 newFileHeader.totalChunks = (uint)chunks.Count;

 byte[] fileBuffer = new byte[HeaderToBytes(newFileHeader).Length + chunks.Sum(chunk => chunk.Length)];
 Buffer.BlockCopy(HeaderToBytes(newFileHeader), 0, fileBuffer, 0, 28);

 foreach (byte[] chunk in chunks)
 {
 Buffer.BlockCopy(chunk, 0, fileBuffer, offset, chunk.Length);
 offset += chunk.Length;
 }

 using (MemoryStream ms = new MemoryStream(fileBuffer))
 {
 try
 {
 (status, string _, byte[] _) = fastBootTransport.SendData(ms);
 }
 catch
 {
 return false;
 }

 if (status != FastBootStatus.OKAY)
 {
 return false;
 }

 try
 {
 (FastBootStatus status, string response, byte[] rawResponse)[] responses = fastBootTransport.SendCommand($"flash:{partition}");
 (status, string _, byte[] _) = responses.Last();
 }
 catch
 {
 return false;
 }

 if (status != FastBootStatus.OKAY)
 {
 return false;
 }
 }

 chunks.Clear();
 availableSpace = (int)maxDownloadSize - (int)fileHeader.fileHeaderSize;

 if (blockPosition > 0)
 {
 sparseChunkHeader dummyChunk = new sparseChunkHeader
 {
 chunkType = (ushort)chunkTypes.DONT_CARE,
 reserved = 0,
 chunkSize = blockPosition,
 totalSize = fileHeader.chunkHeaderSize
 };
 chunks.Add(ChunkHeaderToBytes(dummyChunk));
 availableSpace -= fileHeader.chunkHeaderSize;
 }
 }

 byte[] chunk_data = new byte[chunkHeader.totalSize];
 Buffer.BlockCopy(sparseChunkHeaderBuffer, 0, chunk_data, 0, 12);

 int payload = (int)chunkHeader.totalSize - 12;
 stream.ReadExactly(chunk_data, 12, payload);

 chunks.Add(chunk_data);
 blockPosition += chunkHeader.chunkSize;
 availableSpace -= (int)chunkHeader.totalSize;
 }

 if (chunks.Count > 0)
 {
 sparseFileHeader newFileHeader = fileHeader;
 int offset = fileHeader.fileHeaderSize;

 newFileHeader.totalChunks = (uint)chunks.Count;

 byte[] fileBuffer = new byte[HeaderToBytes(newFileHeader).Length + chunks.Sum(chunk => chunk.Length)];
 Buffer.BlockCopy(HeaderToBytes(newFileHeader), 0, fileBuffer, 0, 28);

 foreach (byte[] chunk in chunks)
 {
 Buffer.BlockCopy(chunk, 0, fileBuffer, offset, chunk.Length);
 offset += chunk.Length;
 }

 using (MemoryStream ms = new MemoryStream(fileBuffer))
 {
 try
 {
 (status, string _, byte[] _) = fastBootTransport.SendData(ms);
 }
 catch
 {
 return false;
 }

 if (status != FastBootStatus.OKAY)
 {
 return false;
 }

 try
 {
 (FastBootStatus status, string response, byte[] rawResponse)[] responses = fastBootTransport.SendCommand($"flash:{partition}");
 (status, string _, byte[] _) = responses.Last();
 }
 catch
 {
 return false;
 }

 if (status != FastBootStatus.OKAY)
 {
 return false;
 }
 }
 }
 return true;
 }
 else
 {
 return false; // TODO: Handle non-sparse but large images (most likely just converting them into raw chunks and sending them off).
 }
 }
 catch
 {
 return false;
 }
 }

 try
 {
Expand Down

121 changes: 121 additions & 0 deletions
Sparse.cs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -0,0 +1,121 @@
using System;
using System.IO;

namespace FastBoot
{
 internal class Sparse
 {
 public static readonly uint sparse_magic = 0xED26FF3A;

 public enum chunkTypes
 {
 RAW = 0xCAC1,
 FILL,
 DONT_CARE,
 CRC32
 }

 public struct sparseFileHeader
 {
 public uint magic;
 public ushort majorVersion;
 public ushort minorVersion;
 public ushort fileHeaderSize;
 public ushort chunkHeaderSize;
 public uint blockSize;
 public uint totalBlocks;
 public uint totalChunks;
 public uint imageChecksum;
 }

 public struct sparseChunkHeader
 {
 public ushort chunkType;
 public ushort reserved;
 public uint chunkSize;
 public uint totalSize;
 }

 private static void VerifySparseFileHeader(sparseFileHeader fileHeader)
 {
 if (fileHeader.magic != sparse_magic) throw new Exception("Invalid sparse magic");
 if (fileHeader.majorVersion > 1) throw new Exception("Sparse format too new");
 if (fileHeader.fileHeaderSize != 28 && fileHeader.majorVersion == 1) throw new Exception("Invalid file header size");
 if (fileHeader.chunkHeaderSize != 12 && fileHeader.majorVersion == 1) throw new Exception("Invalid chunk header size");
 if (fileHeader.blockSize % 4 != 0) throw new Exception("Invalid block size");
 }

 public static sparseFileHeader ReadSparseFileHeader(byte[] buffer)
 {
 sparseFileHeader fileHeader = new();

 using (var ms = new MemoryStream(buffer))
 using (var br = new BinaryReader(ms))
 {
 fileHeader.magic = br.ReadUInt32();
 fileHeader.majorVersion = br.ReadUInt16();
 fileHeader.minorVersion = br.ReadUInt16();
 fileHeader.fileHeaderSize = br.ReadUInt16();
 fileHeader.chunkHeaderSize = br.ReadUInt16();
 fileHeader.blockSize = br.ReadUInt32();
 fileHeader.totalBlocks = br.ReadUInt32();
 fileHeader.totalChunks = br.ReadUInt32();
 fileHeader.imageChecksum = br.ReadUInt32();
 }

 VerifySparseFileHeader(fileHeader);

 return fileHeader;
 }

 public static sparseChunkHeader ReadSparseChunkHeader(byte[] buffer)
 {
 sparseChunkHeader chunk_header = new();

 using (var ms = new MemoryStream(buffer))
 using (var br = new BinaryReader(ms))
 {
 chunk_header.chunkType = br.ReadUInt16();
 chunk_header.reserved = br.ReadUInt16();
 chunk_header.chunkSize = br.ReadUInt32();
 chunk_header.totalSize = br.ReadUInt32();
 }
 return chunk_header;
 }

 public static byte[] HeaderToBytes(sparseFileHeader fileHeader)
 {
 using (var ms = new MemoryStream())
 using (var bw = new BinaryWriter(ms))
 {
 bw.Write(fileHeader.magic);
 bw.Write(fileHeader.majorVersion);
 bw.Write(fileHeader.minorVersion);
 bw.Write(fileHeader.fileHeaderSize);
 bw.Write(fileHeader.chunkHeaderSize);
 bw.Write(fileHeader.blockSize);
 bw.Write(fileHeader.totalBlocks);
 bw.Write(fileHeader.totalChunks);
 bw.Write(fileHeader.imageChecksum);

 return ms.ToArray();
 }
 }

 public static byte[] ChunkHeaderToBytes(sparseChunkHeader chunk)
 {
 if (chunk.chunkType != (uint)chunkTypes.DONT_CARE) throw new Exception("Only DONT_CARE chunks can be generated in this lib.");

 using (var ms = new MemoryStream())
 using (var bw = new BinaryWriter(ms))
 {
 bw.Write(chunk.chunkType);
 bw.Write(chunk.reserved);
 bw.Write(chunk.chunkSize);
 bw.Write(chunk.totalSize);

 return ms.ToArray();
 }
 }
 }
}

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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Add minimal sparse handler and split images up based on sparse chunks when flashing if the image is too big#4

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Add minimal sparse handler and split images up based on sparse chunks when flashing if the image is too big
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dbdcaa4

Add minimal sparse handler


halal-beef Dec 13, 2025
cbd3359

Add sparse splitting support to flashing command


halal-beef Dec 13, 2025

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186 changes: 186 additions & 0 deletions
FastBootCommands.cs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -21,9 +21,12 @@
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography.Xml;
using static FastBoot.Sparse;

namespace FastBoot
{
Expand DownExpand Up@@ -264,6 +267,189 @@ public static bool RebootBootloader(this FastBootTransport fastBootTransport)
 public static bool FlashPartition(this FastBootTransport fastBootTransport, string partition, Stream stream)
 {
 FastBootStatus status;
 uint maxDownloadSize = 0;
 string deviceResponse;

 if(!GetVariable(fastBootTransport, "max-download-size", out deviceResponse)) return false;
 maxDownloadSize = Convert.ToUInt32(deviceResponse);

 if (stream.Length > maxDownloadSize)
 {
 byte[] image_magic = new byte[4];

 try
 {
 stream.Read(image_magic, 0, 4);
 if(BitConverter.ToUInt32(image_magic) == Sparse.sparse_magic)
 {
 byte[] sparseFileHeaderBuffer = new byte[28];
 byte[] sparseChunkHeaderBuffer = new byte[12];
 sparseFileHeader fileHeader;

 List<byte[]> chunks = new();
 uint blockPosition = 0;
 int availableSpace;

 stream.Position = 0;

 stream.ReadExactly(sparseFileHeaderBuffer, 0, 28);
 fileHeader = ReadSparseFileHeader(sparseFileHeaderBuffer);
 availableSpace = (int)maxDownloadSize - (int)fileHeader.fileHeaderSize;

 for (int i = 0; i < fileHeader.totalChunks; i++)
 {
 stream.ReadExactly(sparseChunkHeaderBuffer, 0, 12);
 sparseChunkHeader chunkHeader = ReadSparseChunkHeader(sparseChunkHeaderBuffer);

 if (chunkHeader.totalSize > availableSpace && chunks.Count > 0)
 {
 sparseFileHeader newFileHeader = fileHeader;
 int offset = fileHeader.fileHeaderSize;

 uint padding_blocks = fileHeader.totalBlocks - blockPosition;
 if (padding_blocks > 0)
 {
 sparseChunkHeader dummyChunk = new sparseChunkHeader
 {
 chunkType = (ushort)chunkTypes.DONT_CARE,
 reserved = 0,
 chunkSize = padding_blocks,
 totalSize = fileHeader.chunkHeaderSize
 };
 chunks.Add(ChunkHeaderToBytes(dummyChunk));
 }

 newFileHeader.totalChunks = (uint)chunks.Count;

 byte[] fileBuffer = new byte[HeaderToBytes(newFileHeader).Length + chunks.Sum(chunk => chunk.Length)];
 Buffer.BlockCopy(HeaderToBytes(newFileHeader), 0, fileBuffer, 0, 28);

 foreach (byte[] chunk in chunks)
 {
 Buffer.BlockCopy(chunk, 0, fileBuffer, offset, chunk.Length);
 offset += chunk.Length;
 }

 using (MemoryStream ms = new MemoryStream(fileBuffer))
 {
 try
 {
 (status, string _, byte[] _) = fastBootTransport.SendData(ms);
 }
 catch
 {
 return false;
 }

 if (status != FastBootStatus.OKAY)
 {
 return false;
 }

 try
 {
 (FastBootStatus status, string response, byte[] rawResponse)[] responses = fastBootTransport.SendCommand($"flash:{partition}");
 (status, string _, byte[] _) = responses.Last();
 }
 catch
 {
 return false;
 }

 if (status != FastBootStatus.OKAY)
 {
 return false;
 }
 }

 chunks.Clear();
 availableSpace = (int)maxDownloadSize - (int)fileHeader.fileHeaderSize;

 if (blockPosition > 0)
 {
 sparseChunkHeader dummyChunk = new sparseChunkHeader
 {
 chunkType = (ushort)chunkTypes.DONT_CARE,
 reserved = 0,
 chunkSize = blockPosition,
 totalSize = fileHeader.chunkHeaderSize
 };
 chunks.Add(ChunkHeaderToBytes(dummyChunk));
 availableSpace -= fileHeader.chunkHeaderSize;
 }
 }

 byte[] chunk_data = new byte[chunkHeader.totalSize];
 Buffer.BlockCopy(sparseChunkHeaderBuffer, 0, chunk_data, 0, 12);

 int payload = (int)chunkHeader.totalSize - 12;
 stream.ReadExactly(chunk_data, 12, payload);

 chunks.Add(chunk_data);
 blockPosition += chunkHeader.chunkSize;
 availableSpace -= (int)chunkHeader.totalSize;
 }

 if (chunks.Count > 0)
 {
 sparseFileHeader newFileHeader = fileHeader;
 int offset = fileHeader.fileHeaderSize;

 newFileHeader.totalChunks = (uint)chunks.Count;

 byte[] fileBuffer = new byte[HeaderToBytes(newFileHeader).Length + chunks.Sum(chunk => chunk.Length)];
 Buffer.BlockCopy(HeaderToBytes(newFileHeader), 0, fileBuffer, 0, 28);

 foreach (byte[] chunk in chunks)
 {
 Buffer.BlockCopy(chunk, 0, fileBuffer, offset, chunk.Length);
 offset += chunk.Length;
 }

 using (MemoryStream ms = new MemoryStream(fileBuffer))
 {
 try
 {
 (status, string _, byte[] _) = fastBootTransport.SendData(ms);
 }
 catch
 {
 return false;
 }

 if (status != FastBootStatus.OKAY)
 {
 return false;
 }

 try
 {
 (FastBootStatus status, string response, byte[] rawResponse)[] responses = fastBootTransport.SendCommand($"flash:{partition}");
 (status, string _, byte[] _) = responses.Last();
 }
 catch
 {
 return false;
 }

 if (status != FastBootStatus.OKAY)
 {
 return false;
 }
 }
 }
 return true;
 }
 else
 {
 return false; // TODO: Handle non-sparse but large images (most likely just converting them into raw chunks and sending them off).
 }
 }
 catch
 {
 return false;
 }
 }

 try
 {
Expand Down

121 changes: 121 additions & 0 deletions
Sparse.cs

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Open in desktop

Original file line numberDiff line numberDiff line change
@@ -0,0 +1,121 @@
using System;
using System.IO;

namespace FastBoot
{
 internal class Sparse
 {
 public static readonly uint sparse_magic = 0xED26FF3A;

 public enum chunkTypes
 {
 RAW = 0xCAC1,
 FILL,
 DONT_CARE,
 CRC32
 }

 public struct sparseFileHeader
 {
 public uint magic;
 public ushort majorVersion;
 public ushort minorVersion;
 public ushort fileHeaderSize;
 public ushort chunkHeaderSize;
 public uint blockSize;
 public uint totalBlocks;
 public uint totalChunks;
 public uint imageChecksum;
 }

 public struct sparseChunkHeader
 {
 public ushort chunkType;
 public ushort reserved;
 public uint chunkSize;
 public uint totalSize;
 }

 private static void VerifySparseFileHeader(sparseFileHeader fileHeader)
 {
 if (fileHeader.magic != sparse_magic) throw new Exception("Invalid sparse magic");
 if (fileHeader.majorVersion > 1) throw new Exception("Sparse format too new");
 if (fileHeader.fileHeaderSize != 28 && fileHeader.majorVersion == 1) throw new Exception("Invalid file header size");
 if (fileHeader.chunkHeaderSize != 12 && fileHeader.majorVersion == 1) throw new Exception("Invalid chunk header size");
 if (fileHeader.blockSize % 4 != 0) throw new Exception("Invalid block size");
 }

 public static sparseFileHeader ReadSparseFileHeader(byte[] buffer)
 {
 sparseFileHeader fileHeader = new();

 using (var ms = new MemoryStream(buffer))
 using (var br = new BinaryReader(ms))
 {
 fileHeader.magic = br.ReadUInt32();
 fileHeader.majorVersion = br.ReadUInt16();
 fileHeader.minorVersion = br.ReadUInt16();
 fileHeader.fileHeaderSize = br.ReadUInt16();
 fileHeader.chunkHeaderSize = br.ReadUInt16();
 fileHeader.blockSize = br.ReadUInt32();
 fileHeader.totalBlocks = br.ReadUInt32();
 fileHeader.totalChunks = br.ReadUInt32();
 fileHeader.imageChecksum = br.ReadUInt32();
 }

 VerifySparseFileHeader(fileHeader);

 return fileHeader;
 }

 public static sparseChunkHeader ReadSparseChunkHeader(byte[] buffer)
 {
 sparseChunkHeader chunk_header = new();

 using (var ms = new MemoryStream(buffer))
 using (var br = new BinaryReader(ms))
 {
 chunk_header.chunkType = br.ReadUInt16();
 chunk_header.reserved = br.ReadUInt16();
 chunk_header.chunkSize = br.ReadUInt32();
 chunk_header.totalSize = br.ReadUInt32();
 }
 return chunk_header;
 }

 public static byte[] HeaderToBytes(sparseFileHeader fileHeader)
 {
 using (var ms = new MemoryStream())
 using (var bw = new BinaryWriter(ms))
 {
 bw.Write(fileHeader.magic);
 bw.Write(fileHeader.majorVersion);
 bw.Write(fileHeader.minorVersion);
 bw.Write(fileHeader.fileHeaderSize);
 bw.Write(fileHeader.chunkHeaderSize);
 bw.Write(fileHeader.blockSize);
 bw.Write(fileHeader.totalBlocks);
 bw.Write(fileHeader.totalChunks);
 bw.Write(fileHeader.imageChecksum);

 return ms.ToArray();
 }
 }

 public static byte[] ChunkHeaderToBytes(sparseChunkHeader chunk)
 {
 if (chunk.chunkType != (uint)chunkTypes.DONT_CARE) throw new Exception("Only DONT_CARE chunks can be generated in this lib.");

 using (var ms = new MemoryStream())
 using (var bw = new BinaryWriter(ms))
 {
 bw.Write(chunk.chunkType);
 bw.Write(chunk.reserved);
 bw.Write(chunk.chunkSize);
 bw.Write(chunk.totalSize);

 return ms.ToArray();
 }
 }
 }
}