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Copy pathCompressedBaseFile.cpp
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353 lines (296 loc) · 10.8 KB
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Copy pathCompressedBaseFile.cpp
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353 lines (296 loc) · 10.8 KB
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#include "CompressedBaseFile.h"
#include <sstream>
v8 SCRANTIC::CompressedBaseFile::RLECompress(v8 const &uncompressedData) {
v8 compressedData;
size_t pos = 0;
size_t differenceStart;
u8 length = 0;
u8 byte;
while (pos < uncompressedData.size()) {
byte = uncompressedData[pos++];
while ((uncompressedData[pos] == byte)
&& (length < 0x7E) && (pos < uncompressedData.size())) {
length++;
pos++;
}
if (length) {
compressedData.push_back((length+1) | 0x80);
compressedData.push_back(byte);
length = 0;
continue;
}
differenceStart = pos - 1;
while ((uncompressedData[pos] != byte)
&& (length < 0x7E) && (pos < uncompressedData.size())) {
byte = uncompressedData[pos++];
length++;
}
compressedData.push_back(length+1);
length = 0;
for (; differenceStart < pos; ++differenceStart) {
compressedData.push_back(uncompressedData[differenceStart]);
}
}
return compressedData;
}
v8 SCRANTIC::CompressedBaseFile::RLEDecompress(v8 const &compressedData, size_t offset, u32 size) {
v8 decompressedData;
u8 byte, length;
while ((offset < compressedData.size()) && ((size == 0) || (decompressedData.size() < size))) {
byte = compressedData[offset++];
if ((byte & 0x80) == 0x80) {
length = (u8)(byte & 0x7F);
byte = compressedData[offset++];
for (u8 i = 0; i < length; ++i) {
decompressedData.push_back(byte);
}
} else {
for (u8 i = 0; i < byte; ++i) {
decompressedData.push_back(compressedData[offset++]);
}
}
}
return decompressedData;
}
v8 SCRANTIC::CompressedBaseFile::RLE2Decompress(v8 const &compressedData, size_t offset, u32 size) {
v8 decompressedData;
u8 byte, length;
while ((offset < compressedData.size()) && ((size == 0) || (decompressedData.size() < size))) {
byte = compressedData[offset++];
if ((byte & 0x80) == 0x80) {
length = compressedData[offset++];
for (u8 i = 0; i < length; ++i) {
decompressedData.push_back(byte & 0x7F);
}
} else {
for (u8 i = 0; i < byte; ++i) {
decompressedData.push_back(compressedData[offset++]);
}
}
}
return decompressedData;
}
void SCRANTIC::CompressedBaseFile::writeBits(v8 &data, u8 &bitPos, u16 bits, u8 bitLength) {
bool partialByte = (bitPos != 0);
u32 shiftedData = bits << bitPos;
size_t byteCount = (bitLength + bitPos) / 8;
bitPos = (bitLength + bitPos) % 8;
if (bitPos) {
++byteCount;
}
for (size_t i = 0; i < byteCount; ++i) {
u8 currentByte = (shiftedData >> (8*i)) & 0xFF;
if ((i == 0) && (partialByte)) {
data[data.size() - 1] |= currentByte;
} else {
data.push_back(currentByte);
}
}
}
u16 SCRANTIC::CompressedBaseFile::readBits(v8 const &data, size_t &bytePos, u8 &bitPos, u16 bits) {
u16 byte = 0x00;
for (u16 i = 0; i < bits; ++i) {
if (bytePos >= data.size()) {
return byte;
}
byte |= ((data[bytePos] >> bitPos) & 1) << i;
if (bitPos >= 7) {
bitPos = 0;
++bytePos;
} else {
++bitPos;
}
}
return byte;
}
bool SCRANTIC::CompressedBaseFile::findInDictionary(std::vector<v8> &dictionary, v8 currentBlock, u16 &dictPos) {
if (currentBlock.size() == 1) {
dictPos = currentBlock[0];
return true;
}
for (u16 i = 0; i < dictionary.size(); ++i) {
if (currentBlock.size() != dictionary[i].size()) {
continue;
}
bool mismatch = false;
for (size_t j = 0; j < dictionary[i].size(); ++j) {
if (dictionary[i][j] != currentBlock[j]) {
mismatch = true;
break;
}
}
if (!mismatch) {
dictPos = i + 257;
return true;
}
}
return false;
}
v8 SCRANTIC::CompressedBaseFile::LZCCompress(v8 const &uncompressedData) {
v8 compressedData;
v8 currentBlock;
std::vector<v8> dictionary;
u8 bitLength = 9;
u8 bitPos = 0;
size_t bytePos = 0;
u32 bitCounter = 0;
u8 nextByte;
u16 dictPos = 0;
while (bytePos < uncompressedData.size()) {
nextByte = uncompressedData[bytePos++];
currentBlock.push_back(nextByte);
if (!findInDictionary(dictionary, currentBlock, dictPos)) {
if (dictionary.size() + 256 < 4095) {
dictionary.push_back(currentBlock);
}
currentBlock.pop_back();
if (currentBlock.size() == 1) {
writeBits(compressedData, bitPos, currentBlock[0], bitLength);
} else {
writeBits(compressedData, bitPos, dictPos, bitLength);
}
bitCounter += bitLength;
currentBlock = { nextByte };
if (dictionary.size() + 256 >= (1 << bitLength)) {
++bitLength;
bitCounter = 0;
}
if (dictionary.size() + 256 >= 4095) {
writeBits(compressedData, bitPos, 256, bitLength);
bitCounter += bitLength;
u16 nskip = ((bitLength*8) - ((bitCounter - 1) % (bitLength*8))) - 1;
writeBits(compressedData, bitPos, 0, nskip);
bitCounter = 0;
bitLength = 9;
dictionary.clear();
}
}
}
for (size_t i = 0; i < currentBlock.size(); ++i) {
writeBits(compressedData, bitPos, currentBlock[i], bitLength);
}
return compressedData;
}
v8 SCRANTIC::CompressedBaseFile::LZCDecompress(v8 const &compressedData, size_t offset, u32 size) {
v8 decompressedData;
std::pair<u16, u8> dictionary[4096];
v8 decodeStack;
u8 bitLength = 9;
u16 freeDictPos = 257;
u16 oldcode, newcode, code;
size_t bytePos = offset;
u8 bitPos = 0;
u8 lastbyte;
u32 bitCounter = 0;
oldcode = readBits(compressedData, bytePos, bitPos, bitLength);
lastbyte = oldcode;
decompressedData.push_back((u8)oldcode);
while ((bytePos < compressedData.size()-1) && ((size == 0) || (decompressedData.size() < size))) {
newcode = readBits(compressedData, bytePos, bitPos, bitLength);
bitCounter += bitLength;
if (newcode == 256) {
u16 nskip = ((bitLength*8) - ((bitCounter - 1) % (bitLength*8))) - 1;
readBits(compressedData, bytePos, bitPos, nskip);
bitLength = 9;
freeDictPos = 256;
bitCounter = 0;
continue;
}
code = newcode;
if (code >= freeDictPos) {
if (decodeStack.size() >= 4096) {
break;
}
decodeStack.push_back(lastbyte);
code = oldcode;
}
while (code >= 256) {
if (code > 4095) {
break;
}
decodeStack.push_back(dictionary[code].second);
code = dictionary[code].first;
}
decodeStack.push_back((u8)code);
lastbyte = (u8)code;
for (size_t i = decodeStack.size(); i > 0; --i) {
decompressedData.push_back(decodeStack[i-1]);
}
decodeStack.clear();
if (freeDictPos < 4096) {
dictionary[freeDictPos].first = oldcode;
dictionary[freeDictPos].second = lastbyte;
++freeDictPos;
if ((bitLength < 12) && (freeDictPos >= (1 << bitLength))) {
++bitLength;
bitCounter = 0;
}
}
oldcode = newcode;
}
return decompressedData;
}
bool SCRANTIC::CompressedBaseFile::handleDecompression(v8 &data, v8::iterator &it, v8 &uncompressedData) {
readUintLE(it, compressedSize);
compressedSize -= 5; // substract compressionFlag and uncompressedSize
readUintLE(it, compressionFlag);
readUintLE(it, uncompressedSize);
size_t i = std::distance(data.begin(), it);
switch (compressionFlag) {
case 0x00:
uncompressedData = v8(it, (it+uncompressedSize));
break;
case 0x01:
uncompressedData = RLEDecompress(data, i, uncompressedSize);
// {
// v8 recompressedData = RLECompress(uncompressedData);
// v8 derecompressedData = RLEDecompress(recompressedData, 0, uncompressedSize);
// std::cout << filename << ": compression size " << (u32)compressedSize << std::endl;
// std::cout << filename << ": recompression size " << recompressedData.size() << std::endl;
// for (u32 j = 0; j < uncompressedSize; ++j) {
// if (derecompressedData[j] != uncompressedData[j]) {
// std::cout << filename << ": >>>>>>>>>>>>>>>>>>>>>>>>>> Recompression did not work" << std::endl;
// break;
// }
// }
// }
break;
case 0x02:
uncompressedData = LZCDecompress(data, i, uncompressedSize);
// {
// std::cout << filename << ": Compression flag: " << (i16)compressionFlag << std::endl;
// v8 recompressedData = LZCCompress(uncompressedData);
// v8 derecompressedData = LZCDecompress(recompressedData, 0, uncompressedSize);
// //std::cout << filename << ": compression size " << (u32)compressedSize << std::endl;
// //std::cout << filename << ": recompression size " << recompressedData.size() << std::endl;
// bool mismatch = false;
// for (u32 j = 0; j < uncompressedSize; ++j) {
// if (derecompressedData[j] != uncompressedData[j]) {
// std::cout << filename << ": >>>>>>>>>>>>>>>>>>>>>>>>>> Recompression did not work" << std::endl;
// mismatch = true;
// break;
// }
// }
// if (!mismatch) {
// std::cout << filename << ": compression size difference " << (i32)(recompressedData.size() - compressedSize) << std::endl;
// }
// }
break;
case 0x03:
uncompressedData = RLE2Decompress(data, i, uncompressedSize);
break;
default:
std::cerr << filename << ": unhandled compression type: "
<< (i16)compressionFlag << std::endl;
}
if (uncompressedSize != (u32)uncompressedData.size()) {
std::cerr << filename << ": decompression error: expected size: "
<< (size_t)uncompressedSize << " - got " << uncompressedData.size()
<< " type " << (i16)compressionFlag << std::endl;
return false;
}
if (!uncompressedData.size()) {
return false;
}
return true;
}
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