diskbuilder/filetree.cpp at master · includeos/diskbuilder · GitHub

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#include"filetree.hpp"

#include<cassert>
#include<cerrno>
#include<cstdio>
#include<cstring>
#include<libgen.h>
#include<stdexcept>
#include<sys/stat.h>
#include<dirent.h>

File::File(constchar* path)
{
this->name = std::string(path);

FILE* f = fopen(path, "rb");
if (f == nullptr)
throwstd::runtime_error("diskbuilder: Could not open file " + std::string(path));

fseek(f, 0, SEEK_END);
this->size = ftell(f);
rewind(f);

this->data = std::unique_ptr<char[]> (newchar[size], std::default_delete<char[]> ());
if (this->size > 0)
 {
size_t actual = fread(this->data.get(), this->size, 1, f);
if (actual != 1) {
throwstd::runtime_error("diskbuilder: Could not read from file " + std::string(path));
 }
 }
fclose(f);
}
Dir::Dir(constchar* path)
{
this->name = std::string(path);

/// ... ///
}

voidDir::print(int level) const
{
for (const Dir& d : subs)
 {
printf ("Dir%*s ", level * 2, "");
printf("[%u entries] %s\n",
 d.sectors_used(),
 d.name.c_str());

 d.print(level + 1);
 }
for (const File& f : files)
 {
printf("File%*s ", level * 2, "");
printf("[%08u b -> %06u sect] %s\n",
 f.size,
 f.sectors_used(),
 f.name.c_str());
 }
}

uint32_tDir::sectors_used() const
{
uint32_t cnt = this->size_helper;

for (constauto& dir : subs)
 cnt += dir.sectors_used();

for (constauto& file : files)
 cnt += file.sectors_used();

return cnt;
}

voidFileSys::print() const
{
 root.print(0);
}
voidFileSys::add_dir(Dir& dvec)
{
// push work dir
char pwd_buffer[256];
getcwd(pwd_buffer, sizeof(pwd_buffer));
// go into directory
char cwd_buffer[256];
getcwd(cwd_buffer, sizeof(cwd_buffer));
strcat(cwd_buffer, "/");
strcat(cwd_buffer, dvec.name.c_str());

int res = chdir(cwd_buffer);
// throw immediately when unable to read directory
if (res < 0) {
fprintf(stderr, "Unable to enter directory %s: %s\n", cwd_buffer, strerror(errno));
throwstd::runtime_error("Unable to enter directory " + std::string(cwd_buffer));
 }

auto* dir = opendir(cwd_buffer);
// throw immediately when unable to open directory
if (dir == nullptr) {
fprintf(stderr, "Unable to open directory %s: %s\n", cwd_buffer, strerror(errno));
throwstd::runtime_error("Unable to open directory " + std::string(cwd_buffer));
 }

 std::vector<std::string> sub_dirs;
 std::vector<std::string> sub_files;

structdirent* ent;
while ((ent = readdir(dir)) != nullptr)
 {
 std::string name(ent->d_name);
if (name == ".." || name == ".") continue;

structstat buf;
int res = lstat(ent->d_name, &buf);
if (res < 0) {
fprintf(stderr, "Stat failed on %s with error %s\n",
 ent->d_name, strerror(errno));
continue;
 }

if (S_ISDIR(buf.st_mode)) {
 sub_dirs.push_back(std::move(name));
 }
elseif (S_ISREG(buf.st_mode)) {
 sub_files.push_back(std::move(name));
 }
else {
fprintf(stderr, "Encountered unknown entry %s\n", ent->d_name);
 }
 }
// close directory before adding more folders and files
 res = closedir(dir);
if (res < 0) {
fprintf(stderr, "Unable to close directory: %s\n", strerror(errno));
throwstd::runtime_error("diskbuilder: Failed to close directory");
 }

// add sub directories
for (constauto& dirname : sub_dirs) {
auto& d = dvec.add_dir(dirname.c_str());
add_dir(d);
 }
// add files in current directory
for (constauto& filename : sub_files)
 {
try {
 dvec.add_file(filename.c_str());
 } catch (std::exception& e) {
fprintf(stderr, "%s\n", e.what());
 }
 }

// pop work dir
 res = chdir(pwd_buffer);
if (res < 0) {
fprintf(stderr, "Unable to return to parent directory %s: %s\n", pwd_buffer, strerror(errno));
throwstd::runtime_error("diskbuilder: Failed to return back to parent directory");
 }
}

voidFileSys::gather(constchar* path)
{
 root = Dir(path);
add_dir(root);
}