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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 23 | h266 | 1 | /*- |
| 2 | * Copyright 2003-2005 Colin Percival |
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| 3 | * All rights reserved |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted providing that the following conditions |
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| 7 | * are met: |
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| 8 | * 1. Redistributions of source code must retain the above copyright |
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| 9 | * notice, this list of conditions and the following disclaimer. |
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 11 | * notice, this list of conditions and the following disclaimer in the |
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| 12 | * documentation and/or other materials provided with the distribution. |
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| 13 | * |
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| 14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 15 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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| 16 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
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| 18 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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| 22 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
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| 23 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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| 24 | * POSSIBILITY OF SUCH DAMAGE. |
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| 25 | */ |
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| 26 | |||
| 27 | #if 0 |
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| 28 | __FBSDID("$FreeBSD: src/usr.bin/bsdiff/bspatch/bspatch.c,v 1.1 2005/08/06 01:59:06 cperciva Exp $"); |
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| 29 | #endif |
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| 30 | |||
| 31 | #include <bzlib.h> |
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| 32 | #include <stdlib.h> |
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| 33 | #include <stdio.h> |
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| 34 | #include <string.h> |
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| 35 | #include <err.h> |
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| 36 | #include <unistd.h> |
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| 37 | #include <fcntl.h> |
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| 38 | |||
| 39 | static off_t offtin(u_char *buf) |
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| 40 | { |
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| 41 | off_t y; |
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| 42 | |||
| 43 | y=buf[7]&0x7F; |
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| 44 | y=y*256;y+=buf[6]; |
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| 45 | y=y*256;y+=buf[5]; |
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| 46 | y=y*256;y+=buf[4]; |
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| 47 | y=y*256;y+=buf[3]; |
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| 48 | y=y*256;y+=buf[2]; |
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| 49 | y=y*256;y+=buf[1]; |
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| 50 | y=y*256;y+=buf[0]; |
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| 51 | |||
| 52 | if(buf[7]&0x80) y=-y; |
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| 53 | |||
| 54 | return y; |
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| 55 | } |
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| 56 | |||
| 57 | int main(int argc,char * argv[]) |
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| 58 | { |
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| 59 | FILE * f, * cpf, * dpf, * epf; |
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| 60 | BZFILE * cpfbz2, * dpfbz2, * epfbz2; |
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| 61 | int cbz2err, dbz2err, ebz2err; |
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| 62 | int fd; |
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| 63 | ssize_t oldsize,newsize; |
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| 64 | ssize_t bzctrllen,bzdatalen; |
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| 65 | u_char header[32],buf[8]; |
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| 66 | u_char *old, *new; |
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| 67 | off_t oldpos,newpos; |
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| 68 | off_t ctrl[3]; |
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| 69 | off_t lenread; |
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| 70 | off_t i; |
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| 71 | |||
| 72 | if(argc!=4) errx(1,"usage: %s oldfile newfile patchfile\n",argv[0]); |
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| 73 | |||
| 74 | /* Open patch file */ |
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| 75 | if ((f = fopen(argv[3], "r")) == NULL) |
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| 76 | err(1, "fopen(%s)", argv[3]); |
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| 77 | |||
| 78 | /* |
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| 79 | File format: |
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| 80 | |||
| 81 | 8 8 X |
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| 82 | 16 8 Y |
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| 83 | 24 8 sizeof(newfile) |
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| 84 | 32 X bzip2(control block) |
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| 85 | 32+X Y bzip2(diff block) |
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| 86 | 32+X+Y ??? bzip2(extra block) |
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| 87 | with control block a set of triples (x,y,z) meaning "add x bytes |
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| 88 | from oldfile to x bytes from the diff block; copy y bytes from the |
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| 89 | extra block; seek forwards in oldfile by z bytes". |
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| 90 | */ |
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| 91 | |||
| 92 | /* Read header */ |
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| 93 | if (fread(header, 1, 32, f) < 32) { |
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| 94 | if (feof(f)) |
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| 95 | errx(1, "Corrupt patch\n"); |
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| 96 | err(1, "fread(%s)", argv[3]); |
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| 97 | } |
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| 98 | |||
| 99 | /* Check for appropriate magic */ |
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| 100 | if (memcmp(header, "BSDIFF40", 8) != 0) |
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| 101 | errx(1, "Corrupt patch\n"); |
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| 102 | |||
| 103 | /* Read lengths from header */ |
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| 104 | bzctrllen=offtin(header+8); |
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| 105 | bzdatalen=offtin(header+16); |
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| 106 | newsize=offtin(header+24); |
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| 107 | if((bzctrllen<0) || (bzdatalen<0) || (newsize<0)) |
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| 108 | errx(1,"Corrupt patch\n"); |
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| 109 | |||
| 110 | /* Close patch file and re-open it via libbzip2 at the right places */ |
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| 111 | if (fclose(f)) |
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| 112 | err(1, "fclose(%s)", argv[3]); |
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| 113 | if ((cpf = fopen(argv[3], "r")) == NULL) |
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| 114 | err(1, "fopen(%s)", argv[3]); |
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| 115 | if (fseeko(cpf, 32, SEEK_SET)) |
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| 116 | err(1, "fseeko(%s, %lld)", argv[3], |
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| 117 | (long long)32); |
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| 118 | if ((cpfbz2 = BZ2_bzReadOpen(&cbz2err, cpf, 0, 0, NULL, 0)) == NULL) |
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| 119 | errx(1, "BZ2_bzReadOpen, bz2err = %d", cbz2err); |
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| 120 | if ((dpf = fopen(argv[3], "r")) == NULL) |
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| 121 | err(1, "fopen(%s)", argv[3]); |
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| 122 | if (fseeko(dpf, 32 + bzctrllen, SEEK_SET)) |
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| 123 | err(1, "fseeko(%s, %lld)", argv[3], |
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| 124 | (long long)(32 + bzctrllen)); |
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| 125 | if ((dpfbz2 = BZ2_bzReadOpen(&dbz2err, dpf, 0, 0, NULL, 0)) == NULL) |
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| 126 | errx(1, "BZ2_bzReadOpen, bz2err = %d", dbz2err); |
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| 127 | if ((epf = fopen(argv[3], "r")) == NULL) |
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| 128 | err(1, "fopen(%s)", argv[3]); |
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| 129 | if (fseeko(epf, 32 + bzctrllen + bzdatalen, SEEK_SET)) |
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| 130 | err(1, "fseeko(%s, %lld)", argv[3], |
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| 131 | (long long)(32 + bzctrllen + bzdatalen)); |
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| 132 | if ((epfbz2 = BZ2_bzReadOpen(&ebz2err, epf, 0, 0, NULL, 0)) == NULL) |
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| 133 | errx(1, "BZ2_bzReadOpen, bz2err = %d", ebz2err); |
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| 134 | |||
| 135 | if(((fd=open(argv[1],O_RDONLY,0))<0) || |
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| 136 | ((oldsize=lseek(fd,0,SEEK_END))==-1) || |
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| 137 | ((old=malloc(oldsize+1))==NULL) || |
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| 138 | (lseek(fd,0,SEEK_SET)!=0) || |
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| 139 | (read(fd,old,oldsize)!=oldsize) || |
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| 140 | (close(fd)==-1)) err(1,"%s",argv[1]); |
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| 141 | if((new=malloc(newsize+1))==NULL) err(1,NULL); |
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| 142 | |||
| 143 | oldpos=0;newpos=0; |
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| 144 | while(newpos<newsize) { |
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| 145 | /* Read control data */ |
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| 146 | for(i=0;i<=2;i++) { |
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| 147 | lenread = BZ2_bzRead(&cbz2err, cpfbz2, buf, 8); |
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| 148 | if ((lenread < 8) || ((cbz2err != BZ_OK) && |
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| 149 | (cbz2err != BZ_STREAM_END))) |
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| 150 | errx(1, "Corrupt patch\n"); |
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| 151 | ctrl[i]=offtin(buf); |
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| 152 | }; |
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| 153 | |||
| 154 | /* Sanity-check */ |
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| 155 | if(newpos+ctrl[0]>newsize) |
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| 156 | errx(1,"Corrupt patch\n"); |
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| 157 | |||
| 158 | /* Read diff string */ |
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| 159 | lenread = BZ2_bzRead(&dbz2err, dpfbz2, new + newpos, ctrl[0]); |
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| 160 | if ((lenread < ctrl[0]) || |
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| 161 | ((dbz2err != BZ_OK) && (dbz2err != BZ_STREAM_END))) |
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| 162 | errx(1, "Corrupt patch\n"); |
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| 163 | |||
| 164 | /* Add old data to diff string */ |
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| 165 | for(i=0;i<ctrl[0];i++) |
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| 166 | if((oldpos+i>=0) && (oldpos+i<oldsize)) |
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| 167 | new[newpos+i]+=old[oldpos+i]; |
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| 168 | |||
| 169 | /* Adjust pointers */ |
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| 170 | newpos+=ctrl[0]; |
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| 171 | oldpos+=ctrl[0]; |
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| 172 | |||
| 173 | /* Sanity-check */ |
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| 174 | if(newpos+ctrl[1]>newsize) |
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| 175 | errx(1,"Corrupt patch\n"); |
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| 176 | |||
| 177 | /* Read extra string */ |
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| 178 | lenread = BZ2_bzRead(&ebz2err, epfbz2, new + newpos, ctrl[1]); |
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| 179 | if ((lenread < ctrl[1]) || |
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| 180 | ((ebz2err != BZ_OK) && (ebz2err != BZ_STREAM_END))) |
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| 181 | errx(1, "Corrupt patch\n"); |
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| 182 | |||
| 183 | /* Adjust pointers */ |
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| 184 | newpos+=ctrl[1]; |
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| 185 | oldpos+=ctrl[2]; |
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| 186 | }; |
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| 187 | |||
| 188 | /* Clean up the bzip2 reads */ |
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| 189 | BZ2_bzReadClose(&cbz2err, cpfbz2); |
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| 190 | BZ2_bzReadClose(&dbz2err, dpfbz2); |
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| 191 | BZ2_bzReadClose(&ebz2err, epfbz2); |
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| 192 | if (fclose(cpf) || fclose(dpf) || fclose(epf)) |
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| 193 | err(1, "fclose(%s)", argv[3]); |
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| 194 | |||
| 195 | /* Write the new file */ |
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| 196 | if(((fd=open(argv[2],O_CREAT|O_TRUNC|O_WRONLY,0666))<0) || |
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| 197 | (write(fd,new,newsize)!=newsize) || (close(fd)==-1)) |
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| 198 | err(1,"%s",argv[2]); |
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| 199 | |||
| 200 | free(new); |
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| 201 | free(old); |
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| 202 | |||
| 203 | return 0; |
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| 204 | } |