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 }; 154 155 /* Sanity-check */ 156 if(newpos+ctrl[0]>newsize) 157 errx(1,"Corrupt patch\n"); 158 159 /* Read diff string */ 160 lenread = BZ2_bzRead(&dbz2err, dpfbz2, new + newpos, ctrl[0]); 161 if ((lenread < ctrl[0]) || 162 ((dbz2err != BZ_OK) && (dbz2err != BZ_STREAM_END))) 163 errx(1, "Corrupt patch\n"); 164 165 /* Add old data to diff string */ 166 for(i=0;i<ctrl[0];i++) 167 if((oldpos+i>=0) && (oldpos+i<oldsize)) 168 new[newpos+i]+=old[oldpos+i]; 169 170 /* Adjust pointers */ 171 newpos+=ctrl[0]; 172 oldpos+=ctrl[0]; 173 174 /* Sanity-check */ 175 if(newpos+ctrl[1]>newsize) 176 errx(1,"Corrupt patch\n"); 177 178 /* Read extra string */ 179 lenread = BZ2_bzRead(&ebz2err, epfbz2, new + newpos, ctrl[1]); 180 if ((lenread < ctrl[1]) || 181 ((ebz2err != BZ_OK) && (ebz2err != BZ_STREAM_END))) 182 errx(1, "Corrupt patch\n"); 183 184 /* Adjust pointers */ 185 newpos+=ctrl[1]; 186 oldpos+=ctrl[2]; 187 }; 188 189 /* Clean up the bzip2 reads */ 190 BZ2_bzReadClose(&cbz2err, cpfbz2); 191 BZ2_bzReadClose(&dbz2err, dpfbz2); 192 BZ2_bzReadClose(&ebz2err, epfbz2); 193 if (fclose(cpf) || fclose(dpf) || fclose(epf)) 194 err(1, "fclose(%s)", argv[3]); 195 196 /* Write the new file */ 197 if(((fd=open(argv[2],O_CREAT|O_TRUNC|O_WRONLY,0666))<0) || 198 (write(fd,new,newsize)!=newsize) || (close(fd)==-1)) 199 err(1,"%s",argv[2]); 200 201 free(new); 202 free(old); 203 204 return 0; 205 } 206
