cpp-decoder/fif_decoder.h at master · fifoc/cpp-decoder · GitHub

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//C++ FastIF decoder
//Copyright (C) 2020 I.C.

#pragma once
#include<iostream>
#include<cstring>

structFIFrgb {
unsignedchar r = 0;
unsignedchar g = 0;
unsignedchar b = 0;
};

structFIF {
constunsignedchar* data = nullptr;
unsignedint width = 0;
unsignedint height = 0;
unsignedlong datapos = 0;
bool eof = 0;
 FIFrgb currentBG;
 FIFrgb currentFG;
 FIFrgb* decoded_data = nullptr;
};

//Utils
unsignedchar* fif_slice;
char* fif_slicestring;
//Read bytes of data
unsignedchar* fif_readbytes(FIF* fiffile,unsignedlong length) {
delete[] fif_slice;
 fif_slice = newunsignedchar[length];
for(unsignedint i=0;i<length;i++) {
 fif_slice[i]=fiffile->data[fiffile->datapos++];
 }
return fif_slice;
}
//Get slice as a null terminated string
char* fif_readbytesAsString(FIF* fiffile,unsignedlong length) {
unsignedchar slicestr[length+1];
unsignedchar* bytes=fif_readbytes(fiffile,length);
for(unsignedint i=0;i<length;i++) {
 slicestr[i]=bytes[i];
if(slicestr[i]=='\0') {slicestr[i]='';}
 }
 slicestr[length]='\0';
delete[] fif_slice;
 fif_slicestring = newchar[length+1];
for(unsignedint i=0;i<length+1;i++) {
 fif_slicestring[i]=slicestr[i];
 }
return fif_slicestring;
}
//Get slice and convert it to a number
unsignedcharfif_readbyte(FIF* fiffile) {
return fiffile->data[fiffile->datapos++];
}
//Spliy byte into bits
bool fif_bits[8] = {0};
constbool* fif_getbits(unsignedchar b) {
unsignedchar mask=1;
for(unsignedchar i=0;i<8;i++) {
 fif_bits[i]=(b & (mask << i)) != 0;
 }
return fif_bits;
}
//-----

constunsignedchar fif_bitindex[8] = {0,2,4,1,3,5,6,7};

voidFIF_renderchar(FIF* fiffile, unsignedint x, unsignedint y, unsignedchar c) {
constbool* bits = fif_getbits(c);
unsignedint pos = (x*2)+(y*4)*fiffile->width;
for(unsignedchar i=0;i<8;i++) {
unsignedint wpos = pos + ((fif_bitindex[i] / 2) * fiffile->width) + (fif_bitindex[i] % 2);
if(wpos >= fiffile->width*fiffile->height) {std::cout << "Writer went out of bounds (X: " << x << " Y: " << y << ").\n"; return;};
 fiffile->decoded_data[wpos] = bits[i] ? fiffile->currentFG : fiffile->currentBG;
 }
}

/*
 * Main read function
 *
 * Returns:
 * 0 - success, done decoding file
 * >0 - sleep operation, ms to sleepyes
 * <0 - error
*/
signedintFIF_read(FIF* fiffile) {
if(fiffile->eof) return0;
if(fiffile->datapos == 0) {
//Magic
char* str = fif_readbytesAsString(fiffile,6);
if(strcmp(str,"FastIF") != 0) {
 std::cout << "Invalid FIF file.\n";
return -1;
 }
//Width and height
 fiffile->width = fif_readbyte(fiffile) * 2;
 fiffile->height = fif_readbyte(fiffile) * 4;
//Initialize memory
 fiffile->decoded_data = new FIFrgb[fiffile->width*fiffile->height];
 fiffile->currentBG.r = 0;
 fiffile->currentBG.g = 0;
 fiffile->currentBG.b = 0;
 fiffile->currentFG.r = 0;
 fiffile->currentFG.g = 0;
 fiffile->currentFG.b = 0;
return1;
 }

//Main reading loop
while(!fiffile->eof) {
unsignedchar opbyte = 0;
switch(opbyte = fif_readbyte(fiffile)) {

//BG color
case0x01: {
 fiffile->currentBG.r = fif_readbyte(fiffile);
 fiffile->currentBG.g = fif_readbyte(fiffile);
 fiffile->currentBG.b = fif_readbyte(fiffile);
break;
 }

//FG color
case0x02: {
 fiffile->currentFG.r = fif_readbyte(fiffile);
 fiffile->currentFG.g = fif_readbyte(fiffile);
 fiffile->currentFG.b = fif_readbyte(fiffile);
break;
 }

//Horizontal line
case0x10: {
unsignedint x = fif_readbyte(fiffile);
unsignedint y = fif_readbyte(fiffile);
unsignedint s = fif_readbyte(fiffile);
for(unsignedint i=0;i<s;i++) {
FIF_renderchar(fiffile,x+i,y,fif_readbyte(fiffile));
 }
break;
 }

//Fill
case0x11: {
unsignedint x = fif_readbyte(fiffile);
unsignedint y = fif_readbyte(fiffile);
unsignedint fw = fif_readbyte(fiffile);
unsignedint fh = fif_readbyte(fiffile);
unsignedchar c = fif_readbyte(fiffile);
for(unsignedint ix=0;ix<fw;ix++) {
for(unsignedint iy=0;iy<fh;iy++) {
FIF_renderchar(fiffile,x+ix,y+iy,c);
 }
 }
break;
 }

//Sleep
case0x12: {
returnfif_readbyte(fiffile) * 10;
break;
 }

//Vertical line
case0x13: {
unsignedint x = fif_readbyte(fiffile);
unsignedint y = fif_readbyte(fiffile);
unsignedint s = fif_readbyte(fiffile);
for(unsignedint i=0;i<s;i++) {
FIF_renderchar(fiffile,x,y+i,fif_readbyte(fiffile));
 }
break;
 }

//EOF
case0x20: {
 fiffile->eof = 1;
return0;
 }

//Unused
case0x40: {
for(unsignedint i=0;i<8;i++) fif_readbyte(fiffile);
break;
 }

//Unsupported
default: {
 std::cout << "Unsupported opcode " << std::hex << (unsignedint)opbyte << " at offset " << fiffile->datapos-1 << ".\n";
return -1;
 }
 }
 }
return0;
}

//Free FIF struct memory
voidFIF_free(FIF* fiffile) {
delete[] fiffile->data;
delete[] fiffile->decoded_data;
}