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//---------------------------------------------------------------------------
// FileFormat1.cpp
//---------------------------------------------------------------------------
// -=* VPatch *=-
//---------------------------------------------------------------------------
// Copyright (C) 2001-2005 Koen van de Sande / Van de Sande Productions
//---------------------------------------------------------------------------
// Website: http://www.tibed.net/vpatch
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would be
// appreciated but is not required.
// 2. Altered source versions must be plainly marked as such, and must not be
// misrepresented as being the original software.
// 3. This notice may not be removed or altered from any source distribution.
#include "FileFormat1.h"
#include "GlobalTypes.h"
#define MAGIC_VPAT 0x54415056
namespace FileFormat1 {
void writeByte(bostream& patch, TFileOffset dw) {
unsigned char b = dw & 0xFF;
patch.write(reinterpret_cast<char*>(&b),sizeof(b));
}
void writeWord(bostream& patch, TFileOffset dw) {
unsigned char b = dw & 0xFF;
patch.write(reinterpret_cast<char*>(&b),sizeof(b));
b = (dw & 0xFF00) >> 8;
patch.write(reinterpret_cast<char*>(&b),sizeof(b));
}
void writeDword(bostream& patch, TFileOffset dw) {
unsigned char b = dw & 0xFF;
patch.write(reinterpret_cast<char*>(&b),sizeof(b));
b = (dw & 0xFF00) >> 8;
patch.write(reinterpret_cast<char*>(&b),sizeof(b));
b = (dw & 0xFF0000) >> 16;
patch.write(reinterpret_cast<char*>(&b),sizeof(b));
b = (dw & 0xFF000000) >> 24;
patch.write(reinterpret_cast<char*>(&b),sizeof(b));
}
void writeMD5(bostream& patch, md5_byte_t digest[16]) {
for(int i = 0; i < 16; i++) {
writeByte(patch, digest[i]);
}
}
TFileOffset readDword(bistream& patch) {
unsigned char b;
patch.read(reinterpret_cast<char*>(&b),sizeof(b));
TFileOffset dw = b;
patch.read(reinterpret_cast<char*>(&b),sizeof(b));
dw = dw | (b << 8);
patch.read(reinterpret_cast<char*>(&b),sizeof(b));
dw = dw | (b << 16);
patch.read(reinterpret_cast<char*>(&b),sizeof(b));
dw = dw | (b << 24);
return dw;
}
void readMD5(bistream& patch, md5_byte_t digest[16]) {
unsigned char b;
for(int i = 0; i < 16; i++) {
patch.read(reinterpret_cast<char*>(&b),sizeof(b));
digest[i] = b;
}
}
void writeFileCount(bostream& f, TFileOffset currentCount) {
f.seekp(4,ios::beg);
writeDword(f,currentCount);
}
TFileOffset removeExistingPatch(bistream& in, TFileOffset inSize, bostream& out, TChecksum* removeCRC, bool existanceIsError) {
TFileOffset fileCount = 0x80000000; // MD5 mode
if(in.bad() || in.eof() || (inSize == 0)) { // empty file/does not yet exist
writeDword(out,MAGIC_VPAT);
writeDword(out,fileCount); // noFiles
return fileCount;
}
// copy and do stuff
if(readDword(in) != MAGIC_VPAT) {
writeDword(out,MAGIC_VPAT);
writeDword(out,fileCount); // noFiles
return fileCount;
}
fileCount = readDword(in);
writeDword(out,MAGIC_VPAT);
writeDword(out,fileCount); // noFiles
bool MD5Mode = (fileCount & 0x80000000) != 0;
if(MD5Mode) removeCRC->mode = TChecksum::MD5;
if(!MD5Mode) removeCRC->mode = TChecksum::CRC32;
// top byte is reserved for extensions
fileCount = fileCount & 0x00FFFFFF;
TFileOffset tempCount = fileCount;
for(TFileOffset i = 0; i < tempCount; i++) {
TFileOffset startOffset = in.tellg();
readDword(in); // noBlocks
TChecksum sourceChecksum;
if(!MD5Mode) {
crc32_t sourceCRC = readDword(in); // SourceCRC
readDword(in); // TargetCRC
sourceChecksum.loadCRC32(sourceCRC);
} else {
md5_byte_t digest[16];
readMD5(in, digest); // SourceCRC
sourceChecksum.loadMD5(digest);
readMD5(in, digest); // TargetCRC
}
TFileOffset bodySize = readDword(in); // bodySize
in.seekg(bodySize,ios::cur);
TFileOffset endOffset = in.tellg();
if(sourceChecksum == *removeCRC) {
if(existanceIsError) {
throw "Source file with the exact same contents already exists in patch!\nUse /R option (replace) to replace it with this patch!";
}
fileCount--;
} else {
// copy this patch to out
in.seekg(startOffset,ios::beg);
TFileOffset size = endOffset-startOffset;
char* buffer = new char[size];
in.read(buffer,size);
out.write(buffer,size);
delete[] buffer;
}
}
TFileOffset curPos = out.tellp();
if(MD5Mode) fileCount = fileCount | 0x80000000;
writeFileCount(out,fileCount);
out.seekp(curPos,ios::beg);
return fileCount;
}
void writePatch(bostream& patch, bistream& target, vector<SameBlock*>& sameBlocks, TChecksum* sourceCRC, TChecksum* targetCRC, TFileOffset currentFileCount, POSIX::ALT_FILETIME targetTime) {
TFileOffset bodySize = 0;
TFileOffset noBlocks = 0;
TFileOffset noBlocksOffset = patch.tellp();
writeDword(patch,noBlocks);
if(sourceCRC->mode == TChecksum::MD5) {
writeMD5(patch,sourceCRC->digest); // sourceCRC
writeMD5(patch,targetCRC->digest); // targetCRC
} else {
writeDword(patch,sourceCRC->crc); // sourceCRC
writeDword(patch,targetCRC->crc); // targetCRC
}
TFileOffset bodySizeOffset = patch.tellp();
writeDword(patch,bodySize);
for(vector<SameBlock*>::iterator iter = sameBlocks.begin(); iter != sameBlocks.end(); iter++) {
SameBlock* current = *iter;
// store current block
if(current->size > 0) {
// copy block from sourceFile
if(current->size < 256) {
writeByte(patch,1);
writeByte(patch,current->size);
bodySize += 2;
} else if(current->size < 65536) {
writeByte(patch,2);
writeWord(patch,current->size);
bodySize += 3;
} else {
writeByte(patch,3);
writeDword(patch,current->size);
bodySize += 5;
}
writeDword(patch,current->sourceOffset);
bodySize += 4;
noBlocks++;
}
iter++;
if(iter == sameBlocks.end()) break;
SameBlock* next = *iter;
iter--;
// calculate area inbetween this block and the next
TFileOffset notFoundStart = current->targetOffset+current->size;
if(notFoundStart > next->targetOffset) {
throw "makeBinaryPatch input problem: there was overlap";
}
TFileOffset notFoundSize = next->targetOffset - notFoundStart;
if(notFoundSize > 0) {
// we need to include this area in the patch directly
if(notFoundSize < 256) {
writeByte(patch,5);
writeByte(patch,notFoundSize);
bodySize += 2;
} else if(notFoundSize < 65536) {
writeByte(patch,6);
writeWord(patch,notFoundSize);
bodySize += 3;
} else {
writeByte(patch,7);
writeDword(patch,notFoundSize);
bodySize += 5;
}
// copy from target...
target.seekg(notFoundStart,ios::beg);
#define COPY_BUF_SIZE 4096
char copyBuffer[COPY_BUF_SIZE];
for(TFileOffset i = 0; i < notFoundSize; i += COPY_BUF_SIZE) {
TFileOffset j = notFoundSize - i;
if(j > COPY_BUF_SIZE) j = COPY_BUF_SIZE;
target.read(copyBuffer,j);
patch.write(copyBuffer,j);
}
bodySize += notFoundSize;
noBlocks++;
}
}
// we are done, now add just one extra block with the target file time
writeByte(patch,255);
writeDword(patch,targetTime.dwLowDateTime);
writeDword(patch,targetTime.dwHighDateTime);
noBlocks++;
bodySize += 9;
TFileOffset curPos = patch.tellp();
patch.seekp(noBlocksOffset,ios::beg);
writeDword(patch,noBlocks);
patch.seekp(bodySizeOffset,ios::beg);
writeDword(patch,bodySize);
// do this at the end because it messes up file position
writeFileCount(patch,++currentFileCount);
patch.seekp(curPos,ios::beg);
}
}
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