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f5c1412b283633f11aa0f0a222b93a9ce2cf6f4e
SLikeNet/DependentExtensions/Autopatcher/ApplyPatch.cpp
dev0 f5c1412b28 Init
2025-11-24 14:19:51 +05:30

480 lines
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/*-
* Parts of this code are copyright 2003-2005 Colin Percival
* All rights reserved
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted providing that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This file was taken from RakNet 4.082.
* Please see licenses/RakNet license.txt for the underlying license and related copyright.
*
* Modified work: Copyright (c) 2016-2020, SLikeSoft UG (haftungsbeschränkt)
*
* This source code was modified by SLikeSoft. Modifications are licensed under the MIT-style
* license found in the license.txt file in the root directory of this source tree.
* Alternatively you are permitted to license the modifications under the Simplified BSD License.
*/
#if 0
__FBSDID("$FreeBSD: src/usr.bin/bsdiff/bspatch/bspatch.c,v 1.1 2005/08/06 01:59:06 cperciva Exp $");
#endif
#include "MemoryCompressor.h"
#include <bzlib.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#ifndef _WIN32
// KevinJ - Windows compatibility
#include <err.h>
#include <unistd.h>
#else
typedef int ssize_t;
#include <wchar.h>
#include <io.h>
#include "slikenet/linux_adapter.h"
#include "slikenet/osx_adapter.h"
#define fseeko fseek
static void err(int i, ...)
{
exit(i);
}
static void errx(int i, ...)
{
exit(i);
}
#endif
#include <fcntl.h>
#ifndef _O_BINARY
#define _O_BINARY 0
#endif
#ifndef O_BINARY
#define O_BINARY _O_BINARY
#endif
static off_t offtin(unsigned char *buf)
{
off_t y;
y=buf[7]&0x7F;
y=y*256;y+=buf[6];
y=y*256;y+=buf[5];
y=y*256;y+=buf[4];
y=y*256;y+=buf[3];
y=y*256;y+=buf[2];
y=y*256;y+=buf[1];
y=y*256;y+=buf[0];
if(buf[7]&0x80) y=-y;
return y;
}
// This function modifies the main() function included in bspatch.c of bsdiff-4.3 found at http://www.daemonology.net/bsdiff/
// It is changed to be a standalone function, to work entirely in memory, and to use my class MemoryDecompressor as an interface to BZip
// Up to the caller to deallocate new
bool ApplyPatch(char *old, unsigned int oldsize, char **_new, unsigned int *newsize, char *patch, unsigned int patchsize )
{
// FILE * f, * cpf, * dpf, * epf;
// BZFILE * cpfbz2, * dpfbz2, * epfbz2;
// int cbz2err, dbz2err, ebz2err;
// int fd;
// ssize_t oldsize,newsize;
ssize_t bzctrllen,bzdatalen;
//unsigned char header[32];
unsigned char buf[8];
// unsigned char *old, *_new;
off_t oldpos,newpos;
off_t ctrl[3];
// off_t lenread;
off_t i;
MemoryDecompressor decompress;
unsigned int coff, doff, eoff;
// if(argc!=4) errx(1,"usage: %s oldfile newfile patchfile\n",argv[0]);
/* Open patch file */
// if (fopen_s(&f, argv[3], "rb") != 0)
// err(1, "fopen(%s)", argv[3]);
/*
File format:
0 8 "BSDIFF40"
8 8 X
16 8 Y
24 8 sizeof(newfile)
32 X bzip2(control block)
32+X Y bzip2(diff block)
32+X+Y ??? bzip2(extra block)
with control block a set of triples (x,y,z) meaning "add x bytes
from oldfile to x bytes from the diff block; copy y bytes from the
extra block; seek forwards in oldfile by z bytes".
*/
/* Read header */
// if (fread(header, 1, 32, f) < 32) {
// if (feof(f))
// errx(1, "Corrupt patch\n",0);
// err(1, "fread(%s)", argv[3]);
// }
// memcpy(header, patch, 32);
/* Check for appropriate magic */
if (memcmp(patch, "BSDIFF40", 8) != 0)
// errx(1, "Corrupt patch\n",0);
return false;
/* Read lengths from header */
bzctrllen=offtin((unsigned char*)patch+8);
bzdatalen=offtin((unsigned char*)patch+16);
*newsize=offtin((unsigned char*)patch+24);
if((bzctrllen<0) || (bzdatalen<0) || (*newsize<0))
// errx(1,"Corrupt patch\n",0);
return false;
/* Close patch file and re-open it via libbzip2 at the right places */
// if (fclose(f))
// err(1, "fclose(%s)", argv[3]);
// if (fopen_s(&cpf, argv[3], "rb") != 0)
// err(1, "fopen(%s)", argv[3]);
// if (fseeko(cpf, 32, SEEK_SET))
// err(1, "fseeko(%s, %lld)", argv[3],
// (long long)32);
// if ((cpfbz2 = BZ2_bzReadOpen(&cbz2err, cpf, 0, 0, nullptr, 0)) == nullptr)
// errx(1, "BZ2_bzReadOpen, bz2err = %d", cbz2err);
// if (fopen_s(&dpf, argv[3], "rb") != 0)
// err(1, "fopen(%s)", argv[3]);
// if (fseeko(dpf, 32 + bzctrllen, SEEK_SET))
// err(1, "fseeko(%s, %lld)", argv[3],
// (long long)(32 + bzctrllen));
// if ((dpfbz2 = BZ2_bzReadOpen(&dbz2err, dpf, 0, 0, nullptr, 0)) == nullptr)
// errx(1, "BZ2_bzReadOpen, bz2err = %d", dbz2err);
// if (fopen_s(&epf, argv[3], "rb") != 0)
// err(1, "fopen(%s)", argv[3]);
// if (fseeko(epf, 32 + bzctrllen + bzdatalen, SEEK_SET))
// err(1, "fseeko(%s, %lld)", argv[3],
// (long long)(32 + bzctrllen + bzdatalen));
// if ((epfbz2 = BZ2_bzReadOpen(&ebz2err, epf, 0, 0, nullptr, 0)) == nullptr)
// errx(1, "BZ2_bzReadOpen, bz2err = %d", ebz2err);
// decompress.Decompress((char*)patch+32, patchsize-32, true);
coff=0;
if (decompress.Decompress((char*)patch+32, bzctrllen, false)==false)
return false;
doff=decompress.GetTotalOutputSize();
if (decompress.Decompress((char*)patch+32+bzctrllen, bzdatalen, false)==false)
return false;
eoff=decompress.GetTotalOutputSize();
if (decompress.Decompress((char*)patch+32+bzctrllen+bzdatalen, patchsize-(32+bzctrllen+bzdatalen), true)==false)
return false;
// if(((fd=_open(argv[1],O_RDONLY | _O_BINARY,0))<0) ||
// ((oldsize=_lseek(fd,0,SEEK_END))==-1) ||
// ((old=(unsigned char*)malloc(oldsize+1))==nullptr) ||
// (_lseek(fd,0,SEEK_SET)!=0) ||
// (_read(fd,old,oldsize)!=oldsize) ||
// (_close(fd)==-1)) err(1,"%s",argv[1]);
// if((_new=(unsigned char*)malloc(newsize+1))==nullptr) err(1,nullptr);
*_new = new char[*newsize+1];
oldpos=0;newpos=0;
while(newpos<(off_t)*newsize) {
/* Read control data */
for(i=0;i<=2;i++) {
// lenread = BZ2_bzRead(&cbz2err, cpfbz2, buf, 8);
// if ((lenread < 8) || ((cbz2err != BZ_OK) &&
// (cbz2err != BZ_STREAM_END)))
// errx(1, "Corrupt patch\n");
memcpy(buf, decompress.GetOutput()+coff, 8);
coff+=8;
ctrl[i]=offtin(buf);
};
/* Sanity-check */
if(newpos+ctrl[0]>(off_t)*newsize)
{
delete [] (*_new);
return false;
}
/* Read diff string */
//lenread = BZ2_bzRead(&dbz2err, dpfbz2, _new + newpos, ctrl[0]);
//if ((lenread < ctrl[0]) ||
// ((dbz2err != BZ_OK) && (dbz2err != BZ_STREAM_END)))
// errx(1, "Corrupt patch\n");
memcpy(*_new + newpos, decompress.GetOutput()+doff, ctrl[0]);
doff+=ctrl[0];
/* Add old data to diff string */
for(i=0;i<ctrl[0];i++)
if((oldpos+i>=0) && (oldpos+i<(off_t)oldsize))
(*_new)[newpos+i]+=old[oldpos+i];
/* Adjust pointers */
newpos+=ctrl[0];
oldpos+=ctrl[0];
/* Sanity-check */
if(newpos+ctrl[1]>(off_t)*newsize)
{
delete [] (*_new);
return false;
}
/* Read extra string */
//lenread = BZ2_bzRead(&ebz2err, epfbz2, _new + newpos, ctrl[1]);
//if ((lenread < ctrl[1]) ||
// ((ebz2err != BZ_OK) && (ebz2err != BZ_STREAM_END)))
// errx(1, "Corrupt patch\n");
memcpy(*_new + newpos, decompress.GetOutput()+eoff, ctrl[1]);
eoff+=ctrl[1];
/* Adjust pointers */
newpos+=ctrl[1];
oldpos+=ctrl[2];
};
/* Clean up the bzip2 reads */
// BZ2_bzReadClose(&cbz2err, cpfbz2);
// BZ2_bzReadClose(&dbz2err, dpfbz2);
// BZ2_bzReadClose(&ebz2err, epfbz2);
// if (fclose(cpf) || fclose(dpf) || fclose(epf))
// err(1, "fclose(%s)", argv[3]);
/* Write the new file */
// if(((fd=_open(argv[2],O_CREAT|O_TRUNC|O_WRONLY,0666))<0) ||
// (_write(fd,_new,newsize)!=newsize) || (_close(fd)==-1))
// err(1,"%s",argv[2]);
// free(_new);
// free(old);
return true;
}
int TestPatchInMemory(int argc,char *argv[])
{
FILE *patchFile, *newFile, *oldFile;
char *patch,*_new,*old;
unsigned patchSize, oldSize;
unsigned int newSize;
int res;
if(argc!=4) errx(1,"usage: %s oldfile newfile patchfile\n",argv[0]);
fopen_s(&patchFile, argv[3], "rb");
fopen_s(&newFile, argv[2], "wb");
fopen_s(&oldFile, argv[1], "rb");
fseeko(patchFile, 0, SEEK_END);
fseeko(oldFile, 0, SEEK_END);
patchSize=ftell(patchFile);
oldSize=ftell(oldFile);
fseeko(patchFile, 0, SEEK_SET);
fseeko(oldFile, 0, SEEK_SET);
patch = new char [patchSize];
old = new char [oldSize];
fread(patch, patchSize, 1, patchFile);
fread(old, oldSize, 1, oldFile);
// #low Should not allocate memory in ApplyPatch and then free it in the caller again
// also return value looks inconsistent
res = (ApplyPatch( old, oldSize, &_new, &newSize,patch, patchSize) ? 1 : 0);
delete[] old;
delete[] patch;
fwrite(_new, newSize, 1, newFile);
if (res == 1) {
// if res == 0, _new was already cleared in ApplyPatch
delete[] _new;
}
fclose(patchFile);
fclose(newFile);
fclose(oldFile);
return res;
}
int PATCH_main(int argc,char * argv[])
{
FILE * f, * cpf, * dpf, * epf;
BZFILE * cpfbz2, * dpfbz2, * epfbz2;
int cbz2err, dbz2err, ebz2err;
int fd;
ssize_t oldsize,newsize;
ssize_t bzctrllen,bzdatalen;
unsigned char header[32],buf[8];
unsigned char *old, *_new;
off_t oldpos,newpos;
off_t ctrl[3];
off_t lenread;
off_t i;
unsigned bytesRead=0;
if(argc!=4) errx(1,"usage: %s oldfile newfile patchfile\n",argv[0]);
/* Open patch file */
if (fopen_s(&f, argv[3], "rb") != 0)
err(1, "fopen(%s)", argv[3]);
/*
File format:
0 8 "BSDIFF40"
8 8 X
16 8 Y
24 8 sizeof(newfile)
32 X bzip2(control block)
32+X Y bzip2(diff block)
32+X+Y ??? bzip2(extra block)
with control block a set of triples (x,y,z) meaning "add x bytes
from oldfile to x bytes from the diff block; copy y bytes from the
extra block; seek forwards in oldfile by z bytes".
*/
/* Read header */
if (fread(header, 1, 32, f) < 32) {
if (feof(f))
errx(1, "Corrupt patch\n");
err(1, "fread(%s)", argv[3]);
}
/* Check for appropriate magic */
if (memcmp(header, "BSDIFF40", 8) != 0)
errx(1, "Corrupt patch\n");
/* Read lengths from header */
bzctrllen=offtin(header+8);
bzdatalen=offtin(header+16);
newsize=offtin(header+24);
if((bzctrllen<0) || (bzdatalen<0) || (newsize<0))
errx(1,"Corrupt patch\n");
/* Close patch file and re-open it via libbzip2 at the right places */
if (fclose(f))
err(1, "fclose(%s)", argv[3]);
if (fopen_s(&cpf, argv[3], "rb") != 0)
err(1, "fopen(%s)", argv[3]);
if (fseeko(cpf, 32, SEEK_SET))
err(1, "fseeko(%s, %lld)", argv[3],
(long long)32);
if ((cpfbz2 = BZ2_bzReadOpen(&cbz2err, cpf, 0, 0, nullptr, 0)) == nullptr)
errx(1, "BZ2_bzReadOpen, bz2err = %d", cbz2err);
if (fopen_s(&dpf, argv[3], "rb") != 0)
err(1, "fopen(%s)", argv[3]);
if (fseeko(dpf, 32 + bzctrllen, SEEK_SET))
err(1, "fseeko(%s, %lld)", argv[3],
(long long)(32 + bzctrllen));
if ((dpfbz2 = BZ2_bzReadOpen(&dbz2err, dpf, 0, 0, nullptr, 0)) == nullptr)
errx(1, "BZ2_bzReadOpen, bz2err = %d", dbz2err);
if (fopen_s(&epf, argv[3], "rb") != 0)
err(1, "fopen(%s)", argv[3]);
if (fseeko(epf, 32 + bzctrllen + bzdatalen, SEEK_SET))
err(1, "fseeko(%s, %lld)", argv[3],
(long long)(32 + bzctrllen + bzdatalen));
if ((epfbz2 = BZ2_bzReadOpen(&ebz2err, epf, 0, 0, nullptr, 0)) == nullptr)
errx(1, "BZ2_bzReadOpen, bz2err = %d", ebz2err);
if(((fd=_open(argv[1],O_RDONLY|O_BINARY,0))<0) ||
((oldsize=_lseek(fd,0,SEEK_END))==-1) ||
((old=(unsigned char*)malloc(oldsize+1))== nullptr) ||
(_lseek(fd,0,SEEK_SET)!=0) ||
(_read(fd,old,oldsize)!=oldsize) ||
(_close(fd)==-1)) err(1,"%s",argv[1]);
if((_new=(unsigned char*)malloc(newsize+1))== nullptr) err(1, nullptr);
oldpos=0;newpos=0;
while(newpos<newsize) {
/* Read control data */
for(i=0;i<=2;i++) {
lenread = BZ2_bzRead(&cbz2err, cpfbz2, buf, 8);
if ((lenread < 8) || ((cbz2err != BZ_OK) &&
(cbz2err != BZ_STREAM_END)))
errx(1, "Corrupt patch\n");
bytesRead+=8;
//printf("cbz2err cpfbz2 %i %i\n", 8, bytesRead);
ctrl[i]=offtin(buf);
};
/* Sanity-check */
if(newpos+ctrl[0]>newsize)
errx(1,"Corrupt patch\n");
/* Read diff string */
lenread = BZ2_bzRead(&dbz2err, dpfbz2, _new + newpos, ctrl[0]);
bytesRead+=8;
// printf("dbz2err dpfbz2 %i %i\n", ctrl[0], bytesRead);
if ((lenread < ctrl[0]) ||
((dbz2err != BZ_OK) && (dbz2err != BZ_STREAM_END)))
errx(1, "Corrupt patch\n");
/* Add old data to diff string */
for(i=0;i<ctrl[0];i++)
if((oldpos+i>=0) && (oldpos+i<oldsize))
_new[newpos+i]+=old[oldpos+i];
/* Adjust pointers */
newpos+=ctrl[0];
oldpos+=ctrl[0];
/* Sanity-check */
if(newpos+ctrl[1]>newsize)
errx(1,"Corrupt patch\n");
/* Read extra string */
lenread = BZ2_bzRead(&ebz2err, epfbz2, _new + newpos, ctrl[1]);
bytesRead+=8;
// printf("ebz2err epfbz2 %i %i\n", ctrl[1], bytesRead);
if ((lenread < ctrl[1]) ||
((ebz2err != BZ_OK) && (ebz2err != BZ_STREAM_END)))
errx(1, "Corrupt patch\n");
/* Adjust pointers */
newpos+=ctrl[1];
oldpos+=ctrl[2];
};
/* Clean up the bzip2 reads */
BZ2_bzReadClose(&cbz2err, cpfbz2);
BZ2_bzReadClose(&dbz2err, dpfbz2);
BZ2_bzReadClose(&ebz2err, epfbz2);
if (fclose(cpf) || fclose(dpf) || fclose(epf))
err(1, "fclose(%s)", argv[3]);
/* Write the new file */
if(((fd=_open(argv[2],O_CREAT|O_TRUNC|O_WRONLY|O_BINARY,0666))<0) ||
(_write(fd,_new,newsize)!=newsize) || (_close(fd)==-1))
err(1,"%s",argv[2]);
free(_new);
free(old);
return 0;
}
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