304 lines
7.0 KiB
C
304 lines
7.0 KiB
C
/*-
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* Copyright 2003-2005 Colin Percival
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* All rights reserved
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted providing that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef _MSC_VER
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// bogus 'secure' nonsense
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#define _CRT_SECURE_NO_WARNINGS
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// bogus signed/unsigned mismatch
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#pragma warning( disable: 4018)
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#endif
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#ifdef _WIN32
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#include <sys/types.h>
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#define ssize_t size_t
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#else
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#include <unistd.h>
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#endif
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#if defined __APPLE__ && defined __MACH__
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typedef unsigned char u_char;
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#endif
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#include "bzlib.h"
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#include "bspatch.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <fcntl.h>
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static off_t offtin(u_char *buf)
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{
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off_t y;
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y=buf[7]&0x7F;
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y=y*256;y+=buf[6];
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y=y*256;y+=buf[5];
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y=y*256;y+=buf[4];
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y=y*256;y+=buf[3];
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y=y*256;y+=buf[2];
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y=y*256;y+=buf[1];
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y=y*256;y+=buf[0];
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if(buf[7]&0x80) y=-y;
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return y;
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}
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int bspatch(const char * oldfile, const char * newfile, const char * patchfile)
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{
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FILE * f, * cpf, * dpf, * epf;
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BZFILE * cpfbz2, * dpfbz2, * epfbz2;
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int cbz2err, dbz2err, ebz2err;
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FILE * temp;
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ssize_t oldsize,newsize;
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ssize_t bzctrllen,bzdatalen;
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unsigned char header[32],buf[8];
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unsigned char *old_contents;
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unsigned char *new_contents;
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off_t oldpos,newpos;
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off_t ctrl[3];
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off_t lenread;
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off_t i;
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/* Open patch file */
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if ((f = fopen(patchfile, "rb")) == NULL)
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{
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//err(1, "fopen(%s)", argv[3]);
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return ERR_OTHER;
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}
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/*
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File format:
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0 8 "BSDIFF40"
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8 8 X
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16 8 Y
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24 8 sizeof(newfile)
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32 X bzip2(control block)
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32+X Y bzip2(diff block)
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32+X+Y ??? bzip2(extra block)
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with control block a set of triples (x,y,z) meaning "add x bytes
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from oldfile to x bytes from the diff block; copy y bytes from the
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extra block; seek forwards in oldfile by z bytes".
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*/
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/* Read header */
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if (fread(header, 1, 32, f) < 32)
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{
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if (feof(f))
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{
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//errx(1, "Corrupt patch\n");
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return ERR_CORRUPT_PATCH;
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}
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//err(1, "fread(%s)", argv[3]);
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return ERR_OTHER;
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}
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/* Check for appropriate magic */
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if (memcmp(header, "BSDIFF40", 8) != 0)
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{
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//errx(1, "Corrupt patch\n");
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return ERR_CORRUPT_PATCH;
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}
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/* Read lengths from header */
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bzctrllen=offtin(header+8);
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bzdatalen=offtin(header+16);
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newsize=offtin(header+24);
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if((bzctrllen<0) || (bzdatalen<0) || (newsize<0))
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{
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//errx(1,"Corrupt patch\n");
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return ERR_CORRUPT_PATCH;
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}
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/* Close patch file and re-open it via libbzip2 at the right places */
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if (fclose(f))
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{
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//err(1, "fclose(%s)", argv[3]);
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return ERR_OTHER;
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}
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if ((cpf = fopen(patchfile, "rb")) == NULL)
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{
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//err(1, "fopen(%s)", argv[3]);
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return ERR_OTHER;
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}
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if (fseek(cpf, 32, SEEK_SET))
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{
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// err(1, "fseeko(%s, %lld)", argv[3], (long long)32);
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return ERR_OTHER;
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}
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if ((cpfbz2 = BZ2_bzReadOpen(&cbz2err, cpf, 0, 0, NULL, 0)) == NULL)
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{
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//errx(1, "BZ2_bzReadOpen, bz2err = %d", cbz2err);
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return ERR_OTHER;
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}
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if ((dpf = fopen(patchfile, "rb")) == NULL)
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{
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//err(1, "fopen(%s)", argv[3]);
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return ERR_OTHER;
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}
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if (fseek(dpf, 32 + bzctrllen, SEEK_SET))
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{
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//err(1, "fseeko(%s, %lld)", argv[3], (long long)(32 + bzctrllen));
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return ERR_OTHER;
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}
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if ((dpfbz2 = BZ2_bzReadOpen(&dbz2err, dpf, 0, 0, NULL, 0)) == NULL)
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{
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//errx(1, "BZ2_bzReadOpen, bz2err = %d", dbz2err);
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return ERR_OTHER;
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}
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if ((epf = fopen(patchfile, "rb")) == NULL)
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{
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//err(1, "fopen(%s)", argv[3]);
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return ERR_OTHER;
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}
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if (fseek(epf, 32 + bzctrllen + bzdatalen, SEEK_SET))
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{
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//err(1, "fseeko(%s, %lld)", argv[3], (long long)(32 + bzctrllen + bzdatalen));
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return ERR_OTHER;
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}
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if ((epfbz2 = BZ2_bzReadOpen(&ebz2err, epf, 0, 0, NULL, 0)) == NULL)
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{
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//errx(1, "BZ2_bzReadOpen, bz2err = %d", ebz2err);
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return ERR_OTHER;
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}
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if((temp=fopen(oldfile,"rb")) == NULL)
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{
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return ERR_OTHER;
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}
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if((fseek(temp,0,SEEK_END))!=0)
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{
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return ERR_OTHER;
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}
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oldsize = ftell(temp);
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if((old_contents=malloc(oldsize+1))==NULL)
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{
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return ERR_OTHER;
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}
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rewind(temp);
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if(fread(old_contents,oldsize,1,temp)!=1)
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{
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return ERR_OTHER;
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}
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if(fclose(temp)==EOF)
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{
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return ERR_OTHER;
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}
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if((new_contents=malloc(newsize+1))==NULL)
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{
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//err(1,NULL);
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return ERR_OTHER;
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}
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oldpos=0;newpos=0;
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while(newpos<newsize)
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{
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/* Read control data */
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for(i=0;i<=2;i++) {
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lenread = BZ2_bzRead(&cbz2err, cpfbz2, buf, 8);
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if ((lenread < 8) || ((cbz2err != BZ_OK) && (cbz2err != BZ_STREAM_END)))
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{
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//errx(1, "Corrupt patch\n");
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return ERR_CORRUPT_PATCH;
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}
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ctrl[i]=offtin(buf);
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};
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/* Sanity-check */
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if(newpos+ctrl[0]>newsize)
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{
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//errx(1,"Corrupt patch\n");
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return ERR_CORRUPT_PATCH;
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}
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/* Read diff string */
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lenread = BZ2_bzRead(&dbz2err, dpfbz2, new_contents + newpos, ctrl[0]);
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if ((lenread < ctrl[0]) || ((dbz2err != BZ_OK) && (dbz2err != BZ_STREAM_END)))
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{
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//errx(1, "Corrupt patch\n");
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return ERR_CORRUPT_PATCH;
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}
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/* Add old data to diff string */
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for(i=0;i<ctrl[0];i++)
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{
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if((oldpos+i>=0) && (oldpos+i<oldsize))
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{
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new_contents[newpos+i]+=old_contents[oldpos+i];
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}
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}
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/* Adjust pointers */
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newpos+=ctrl[0];
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oldpos+=ctrl[0];
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/* Sanity-check */
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if(newpos+ctrl[1]>newsize)
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{
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//errx(1,"Corrupt patch\n");
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return ERR_CORRUPT_PATCH;
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}
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/* Read extra string */
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lenread = BZ2_bzRead(&ebz2err, epfbz2, new_contents + newpos, ctrl[1]);
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if ((lenread < ctrl[1]) || ((ebz2err != BZ_OK) && (ebz2err != BZ_STREAM_END)))
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{
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//errx(1, "Corrupt patch\n");
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return ERR_CORRUPT_PATCH;
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}
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/* Adjust pointers */
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newpos+=ctrl[1];
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oldpos+=ctrl[2];
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};
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/* Clean up the bzip2 reads */
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BZ2_bzReadClose(&cbz2err, cpfbz2);
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BZ2_bzReadClose(&dbz2err, dpfbz2);
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BZ2_bzReadClose(&ebz2err, epfbz2);
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if (fclose(cpf) || fclose(dpf) || fclose(epf))
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{
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//err(1, "fclose(%s)", argv[3]);
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return ERR_OTHER;
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}
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/* Write the new file */
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if(
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((temp=fopen(newfile,"wb"))==NULL) ||
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(fwrite(new_contents,newsize,1,temp)==0) ||
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(fclose(temp)==EOF)
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)
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{
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//err(1,"%s",argv[2]);
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return ERR_OTHER;
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}
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free(new_contents);
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free(old_contents);
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return ERR_NONE;
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}
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