diff options
Diffstat (limited to 'patchlib/bspatch.c')
| -rw-r--r-- | patchlib/bspatch.c | 303 |
1 files changed, 303 insertions, 0 deletions
diff --git a/patchlib/bspatch.c b/patchlib/bspatch.c new file mode 100644 index 00000000..e8469edc --- /dev/null +++ b/patchlib/bspatch.c @@ -0,0 +1,303 @@ +/*- + * 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 <sys/types.h> + #define ssize_t size_t +#else + #include <unistd.h> +#endif + +#if defined __APPLE__ && defined __MACH__ + typedef unsigned char u_char; +#endif + +#include "bzlib.h" +#include "bspatch.h" +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <fcntl.h> + +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(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"); + return ERR_CORRUPT_PATCH; + } + ctrl[i]=offtin(buf); + }; + + /* Sanity-check */ + if(newpos+ctrl[0]>newsize) + { + //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<ctrl[0];i++) + { + if((oldpos+i>=0) && (oldpos+i<oldsize)) + { + new_contents[newpos+i]+=old_contents[oldpos+i]; + } + } + + /* Adjust pointers */ + newpos+=ctrl[0]; + oldpos+=ctrl[0]; + + /* Sanity-check */ + if(newpos+ctrl[1]>newsize) + { + //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; +} |