/*- * 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. */ #ifdef _MSC_VER // bogus 'secure' nonsense #define _CRT_SECURE_NO_WARNINGS // bogus signed/unsigned mismatch #pragma warning( disable: 4018) #endif #ifdef _WIN32 #include #define ssize_t size_t #else #include #endif #if defined __APPLE__ && defined __MACH__ typedef unsigned char u_char; #endif #include "bzlib.h" #include "bspatch.h" #include #include #include #include static off_t offtin(u_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; } int bspatch(const char * oldfile, const char * newfile, const char * patchfile) { FILE * f, * cpf, * dpf, * epf; BZFILE * cpfbz2, * dpfbz2, * epfbz2; int cbz2err, dbz2err, ebz2err; FILE * temp; ssize_t oldsize,newsize; ssize_t bzctrllen,bzdatalen; unsigned char header[32],buf[8]; unsigned char *old_contents; unsigned char *new_contents; off_t oldpos,newpos; off_t ctrl[3]; off_t lenread; off_t i; /* Open patch file */ if ((f = fopen(patchfile, "rb")) == NULL) { //err(1, "fopen(%s)", argv[3]); return ERR_OTHER; } /* 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"); return ERR_CORRUPT_PATCH; } //err(1, "fread(%s)", argv[3]); return ERR_OTHER; } /* Check for appropriate magic */ if (memcmp(header, "BSDIFF40", 8) != 0) { //errx(1, "Corrupt patch\n"); return ERR_CORRUPT_PATCH; } /* 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"); return ERR_CORRUPT_PATCH; } /* Close patch file and re-open it via libbzip2 at the right places */ if (fclose(f)) { //err(1, "fclose(%s)", argv[3]); return ERR_OTHER; } if ((cpf = fopen(patchfile, "rb")) == NULL) { //err(1, "fopen(%s)", argv[3]); return ERR_OTHER; } if (fseek(cpf, 32, SEEK_SET)) { // err(1, "fseeko(%s, %lld)", argv[3], (long long)32); return ERR_OTHER; } if ((cpfbz2 = BZ2_bzReadOpen(&cbz2err, cpf, 0, 0, NULL, 0)) == NULL) { //errx(1, "BZ2_bzReadOpen, bz2err = %d", cbz2err); return ERR_OTHER; } if ((dpf = fopen(patchfile, "rb")) == NULL) { //err(1, "fopen(%s)", argv[3]); return ERR_OTHER; } if (fseek(dpf, 32 + bzctrllen, SEEK_SET)) { //err(1, "fseeko(%s, %lld)", argv[3], (long long)(32 + bzctrllen)); return ERR_OTHER; } if ((dpfbz2 = BZ2_bzReadOpen(&dbz2err, dpf, 0, 0, NULL, 0)) == NULL) { //errx(1, "BZ2_bzReadOpen, bz2err = %d", dbz2err); return ERR_OTHER; } if ((epf = fopen(patchfile, "rb")) == NULL) { //err(1, "fopen(%s)", argv[3]); return ERR_OTHER; } if (fseek(epf, 32 + bzctrllen + bzdatalen, SEEK_SET)) { //err(1, "fseeko(%s, %lld)", argv[3], (long long)(32 + bzctrllen + bzdatalen)); return ERR_OTHER; } if ((epfbz2 = BZ2_bzReadOpen(&ebz2err, epf, 0, 0, NULL, 0)) == NULL) { //errx(1, "BZ2_bzReadOpen, bz2err = %d", ebz2err); return ERR_OTHER; } if((temp=fopen(oldfile,"rb")) == NULL) { return ERR_OTHER; } if((fseek(temp,0,SEEK_END))!=0) { return ERR_OTHER; } oldsize = ftell(temp); if((old_contents=malloc(oldsize+1))==NULL) { return ERR_OTHER; } rewind(temp); if(fread(old_contents,oldsize,1,temp)!=1) { return ERR_OTHER; } if(fclose(temp)==EOF) { return ERR_OTHER; } if((new_contents=malloc(newsize+1))==NULL) { //err(1,NULL); return ERR_OTHER; } oldpos=0;newpos=0; while(newposnewsize) { //errx(1,"Corrupt patch\n"); return ERR_CORRUPT_PATCH; } /* Read diff string */ lenread = BZ2_bzRead(&dbz2err, dpfbz2, new_contents + newpos, ctrl[0]); if ((lenread < ctrl[0]) || ((dbz2err != BZ_OK) && (dbz2err != BZ_STREAM_END))) { //errx(1, "Corrupt patch\n"); return ERR_CORRUPT_PATCH; } /* Add old data to diff string */ for(i=0;i=0) && (oldpos+inewsize) { //errx(1,"Corrupt patch\n"); return ERR_CORRUPT_PATCH; } /* Read extra string */ lenread = BZ2_bzRead(&ebz2err, epfbz2, new_contents + newpos, ctrl[1]); if ((lenread < ctrl[1]) || ((ebz2err != BZ_OK) && (ebz2err != BZ_STREAM_END))) { //errx(1, "Corrupt patch\n"); return ERR_CORRUPT_PATCH; } /* 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]); return ERR_OTHER; } /* Write the new file */ if( ((temp=fopen(newfile,"wb"))==NULL) || (fwrite(new_contents,newsize,1,temp)==0) || (fclose(temp)==EOF) ) { //err(1,"%s",argv[2]); return ERR_OTHER; } free(new_contents); free(old_contents); return ERR_NONE; }