The Android Open Source Project | c285fea | 2009-03-03 19:29:20 -0800 | [diff] [blame] | 1 | /*- |
| 2 | * Copyright 2003-2005 Colin Percival |
| 3 | * All rights reserved |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted providing that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * |
| 14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 15 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| 16 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
| 18 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 22 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| 23 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 24 | * POSSIBILITY OF SUCH DAMAGE. |
| 25 | */ |
| 26 | |
| 27 | #if 0 |
| 28 | __FBSDID("$FreeBSD: src/usr.bin/bsdiff/bspatch/bspatch.c,v 1.1 2005/08/06 01:59:06 cperciva Exp $"); |
| 29 | #endif |
| 30 | |
| 31 | #include <bzlib.h> |
| 32 | #include <stdlib.h> |
| 33 | #include <stdio.h> |
| 34 | #include <string.h> |
| 35 | #include <err.h> |
| 36 | #include <unistd.h> |
| 37 | #include <fcntl.h> |
| 38 | #include <sys/types.h> // android |
| 39 | |
| 40 | static off_t offtin(u_char *buf) |
| 41 | { |
| 42 | off_t y; |
| 43 | |
| 44 | y=buf[7]&0x7F; |
| 45 | y=y*256;y+=buf[6]; |
| 46 | y=y*256;y+=buf[5]; |
| 47 | y=y*256;y+=buf[4]; |
| 48 | y=y*256;y+=buf[3]; |
| 49 | y=y*256;y+=buf[2]; |
| 50 | y=y*256;y+=buf[1]; |
| 51 | y=y*256;y+=buf[0]; |
| 52 | |
| 53 | if(buf[7]&0x80) y=-y; |
| 54 | |
| 55 | return y; |
| 56 | } |
| 57 | |
| 58 | int main(int argc,char * argv[]) |
| 59 | { |
| 60 | FILE * f, * cpf, * dpf, * epf; |
| 61 | BZFILE * cpfbz2, * dpfbz2, * epfbz2; |
| 62 | int cbz2err, dbz2err, ebz2err; |
| 63 | int fd; |
| 64 | ssize_t oldsize,newsize; |
| 65 | ssize_t bzctrllen,bzdatalen; |
| 66 | u_char header[32],buf[8]; |
| 67 | u_char *old, *new; |
| 68 | off_t oldpos,newpos; |
| 69 | off_t ctrl[3]; |
| 70 | off_t lenread; |
| 71 | off_t i; |
| 72 | |
| 73 | if(argc!=4) errx(1,"usage: %s oldfile newfile patchfile\n",argv[0]); |
| 74 | |
| 75 | /* Open patch file */ |
| 76 | if ((f = fopen(argv[3], "r")) == NULL) |
| 77 | err(1, "fopen(%s)", argv[3]); |
| 78 | |
| 79 | /* |
| 80 | File format: |
| 81 | 0 8 "BSDIFF40" |
| 82 | 8 8 X |
| 83 | 16 8 Y |
| 84 | 24 8 sizeof(newfile) |
| 85 | 32 X bzip2(control block) |
| 86 | 32+X Y bzip2(diff block) |
| 87 | 32+X+Y ??? bzip2(extra block) |
| 88 | with control block a set of triples (x,y,z) meaning "add x bytes |
| 89 | from oldfile to x bytes from the diff block; copy y bytes from the |
| 90 | extra block; seek forwards in oldfile by z bytes". |
| 91 | */ |
| 92 | |
| 93 | /* Read header */ |
| 94 | if (fread(header, 1, 32, f) < 32) { |
| 95 | if (feof(f)) |
| 96 | errx(1, "Corrupt patch\n"); |
| 97 | err(1, "fread(%s)", argv[3]); |
| 98 | } |
| 99 | |
| 100 | /* Check for appropriate magic */ |
| 101 | if (memcmp(header, "BSDIFF40", 8) != 0) |
| 102 | errx(1, "Corrupt patch\n"); |
| 103 | |
| 104 | /* Read lengths from header */ |
| 105 | bzctrllen=offtin(header+8); |
| 106 | bzdatalen=offtin(header+16); |
| 107 | newsize=offtin(header+24); |
| 108 | if((bzctrllen<0) || (bzdatalen<0) || (newsize<0)) |
| 109 | errx(1,"Corrupt patch\n"); |
| 110 | |
| 111 | /* Close patch file and re-open it via libbzip2 at the right places */ |
| 112 | if (fclose(f)) |
| 113 | err(1, "fclose(%s)", argv[3]); |
| 114 | if ((cpf = fopen(argv[3], "r")) == NULL) |
| 115 | err(1, "fopen(%s)", argv[3]); |
| 116 | if (fseeko(cpf, 32, SEEK_SET)) |
| 117 | err(1, "fseeko(%s, %lld)", argv[3], |
| 118 | (long long)32); |
| 119 | if ((cpfbz2 = BZ2_bzReadOpen(&cbz2err, cpf, 0, 0, NULL, 0)) == NULL) |
| 120 | errx(1, "BZ2_bzReadOpen, bz2err = %d", cbz2err); |
| 121 | if ((dpf = fopen(argv[3], "r")) == NULL) |
| 122 | err(1, "fopen(%s)", argv[3]); |
| 123 | if (fseeko(dpf, 32 + bzctrllen, SEEK_SET)) |
| 124 | err(1, "fseeko(%s, %lld)", argv[3], |
| 125 | (long long)(32 + bzctrllen)); |
| 126 | if ((dpfbz2 = BZ2_bzReadOpen(&dbz2err, dpf, 0, 0, NULL, 0)) == NULL) |
| 127 | errx(1, "BZ2_bzReadOpen, bz2err = %d", dbz2err); |
| 128 | if ((epf = fopen(argv[3], "r")) == NULL) |
| 129 | err(1, "fopen(%s)", argv[3]); |
| 130 | if (fseeko(epf, 32 + bzctrllen + bzdatalen, SEEK_SET)) |
| 131 | err(1, "fseeko(%s, %lld)", argv[3], |
| 132 | (long long)(32 + bzctrllen + bzdatalen)); |
| 133 | if ((epfbz2 = BZ2_bzReadOpen(&ebz2err, epf, 0, 0, NULL, 0)) == NULL) |
| 134 | errx(1, "BZ2_bzReadOpen, bz2err = %d", ebz2err); |
| 135 | |
| 136 | if(((fd=open(argv[1],O_RDONLY,0))<0) || |
| 137 | ((oldsize=lseek(fd,0,SEEK_END))==-1) || |
| 138 | ((old=malloc(oldsize+1))==NULL) || |
| 139 | (lseek(fd,0,SEEK_SET)!=0) || |
| 140 | (read(fd,old,oldsize)!=oldsize) || |
| 141 | (close(fd)==-1)) err(1,"%s",argv[1]); |
| 142 | if((new=malloc(newsize+1))==NULL) err(1,NULL); |
| 143 | |
| 144 | oldpos=0;newpos=0; |
| 145 | while(newpos<newsize) { |
| 146 | /* Read control data */ |
| 147 | for(i=0;i<=2;i++) { |
| 148 | lenread = BZ2_bzRead(&cbz2err, cpfbz2, buf, 8); |
| 149 | if ((lenread < 8) || ((cbz2err != BZ_OK) && |
| 150 | (cbz2err != BZ_STREAM_END))) |
| 151 | errx(1, "Corrupt patch\n"); |
| 152 | ctrl[i]=offtin(buf); |
| 153 | }; |
| 154 | |
Doug Zongker | 4d05479 | 2014-05-13 08:37:06 -0700 | [diff] [blame] | 155 | // android local change (start) |
| 156 | if (ctrl[0]<0||ctrl[1]<0) |
| 157 | errx(1,"Corrupt patch\n"); |
| 158 | // android local change (end) |
| 159 | |
The Android Open Source Project | c285fea | 2009-03-03 19:29:20 -0800 | [diff] [blame] | 160 | /* Sanity-check */ |
| 161 | if(newpos+ctrl[0]>newsize) |
| 162 | errx(1,"Corrupt patch\n"); |
| 163 | |
| 164 | /* Read diff string */ |
| 165 | lenread = BZ2_bzRead(&dbz2err, dpfbz2, new + newpos, ctrl[0]); |
| 166 | if ((lenread < ctrl[0]) || |
| 167 | ((dbz2err != BZ_OK) && (dbz2err != BZ_STREAM_END))) |
| 168 | errx(1, "Corrupt patch\n"); |
| 169 | |
| 170 | /* Add old data to diff string */ |
| 171 | for(i=0;i<ctrl[0];i++) |
| 172 | if((oldpos+i>=0) && (oldpos+i<oldsize)) |
| 173 | new[newpos+i]+=old[oldpos+i]; |
| 174 | |
| 175 | /* Adjust pointers */ |
| 176 | newpos+=ctrl[0]; |
| 177 | oldpos+=ctrl[0]; |
| 178 | |
| 179 | /* Sanity-check */ |
| 180 | if(newpos+ctrl[1]>newsize) |
| 181 | errx(1,"Corrupt patch\n"); |
| 182 | |
| 183 | /* Read extra string */ |
| 184 | lenread = BZ2_bzRead(&ebz2err, epfbz2, new + newpos, ctrl[1]); |
| 185 | if ((lenread < ctrl[1]) || |
| 186 | ((ebz2err != BZ_OK) && (ebz2err != BZ_STREAM_END))) |
| 187 | errx(1, "Corrupt patch\n"); |
| 188 | |
| 189 | /* Adjust pointers */ |
| 190 | newpos+=ctrl[1]; |
| 191 | oldpos+=ctrl[2]; |
| 192 | }; |
| 193 | |
| 194 | /* Clean up the bzip2 reads */ |
| 195 | BZ2_bzReadClose(&cbz2err, cpfbz2); |
| 196 | BZ2_bzReadClose(&dbz2err, dpfbz2); |
| 197 | BZ2_bzReadClose(&ebz2err, epfbz2); |
| 198 | if (fclose(cpf) || fclose(dpf) || fclose(epf)) |
| 199 | err(1, "fclose(%s)", argv[3]); |
| 200 | |
| 201 | /* Write the new file */ |
| 202 | if(((fd=open(argv[2],O_CREAT|O_TRUNC|O_WRONLY,0666))<0) || |
| 203 | (write(fd,new,newsize)!=newsize) || (close(fd)==-1)) |
| 204 | err(1,"%s",argv[2]); |
| 205 | |
| 206 | free(new); |
| 207 | free(old); |
| 208 | |
| 209 | return 0; |
| 210 | } |