/*- * 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 WIN32 #include #else #include #include #endif #include "../bzip2/bzlib.h" #include #include #include #include #define errx err void err(int exitcode, const char * fmt, ...) { va_list valist; va_start(valist, fmt); vprintf(fmt, valist); va_end(valist); exit(exitcode); } static long offtin(u_char *buf) { long 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 apply_bspatch(const char *infile, const char *outfile, const char *patchfile) { FILE * f, *cpf, *dpf, *epf; BZFILE * cpfbz2, *dpfbz2, *epfbz2; int cbz2err, dbz2err, ebz2err; FILE * fs; long oldsize, newsize; long bzctrllen, bzdatalen; u_char header[32], buf[8]; u_char *pold, *pnew; long oldpos, newpos; long ctrl[3]; long lenread; long i; /* Open patch file */ if ((f = fopen(patchfile, "r")) == NULL) err(1, "fopen(%s)", patchfile); /* 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"); err(1, "fread(%s)", patchfile); } /* Check for appropriate magic */ if (memcmp(header, "BSDIFF40", 8) != 0) errx(1, "Corrupt patch\n"); /* 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"); /* Close patch file and re-open it via libbzip2 at the right places */ if (fclose(f)) err(1, "fclose(%s)", patchfile); if ((cpf = fopen(patchfile, "rb")) == NULL) err(1, "fopen(%s)", patchfile); if (fseek(cpf, 32, SEEK_SET)) err(1, "fseeko(%s, %lld)", patchfile, (long long)32); if ((cpfbz2 = BZ2_bzReadOpen(&cbz2err, cpf, 0, 0, NULL, 0)) == NULL) errx(1, "BZ2_bzReadOpen, bz2err = %d", cbz2err); if ((dpf = fopen(patchfile, "rb")) == NULL) err(1, "fopen(%s)", patchfile); if (fseek(dpf, 32 + bzctrllen, SEEK_SET)) err(1, "fseeko(%s, %lld)", patchfile, (long long)(32 + bzctrllen)); if ((dpfbz2 = BZ2_bzReadOpen(&dbz2err, dpf, 0, 0, NULL, 0)) == NULL) errx(1, "BZ2_bzReadOpen, bz2err = %d", dbz2err); if ((epf = fopen(patchfile, "rb")) == NULL) err(1, "fopen(%s)", patchfile); if (fseek(epf, 32 + bzctrllen + bzdatalen, SEEK_SET)) err(1, "fseeko(%s, %lld)", patchfile, (long long)(32 + bzctrllen + bzdatalen)); if ((epfbz2 = BZ2_bzReadOpen(&ebz2err, epf, 0, 0, NULL, 0)) == NULL) errx(1, "BZ2_bzReadOpen, bz2err = %d", ebz2err); fs = fopen(infile, "rb"); if (fs == NULL)err(1, "Open failed :%s", infile); if (fseek(fs, 0, SEEK_END) != 0)err(1, "Seek failed :%s", infile); oldsize = ftell(fs); pold = (u_char *)malloc(oldsize + 1); if (pold == NULL) err(1, "Malloc failed :%s", infile); fseek(fs, 0, SEEK_SET); if (fread(pold, 1, oldsize, fs) == -1) err(1, "Read failed :%s", infile); if (fclose(fs) == -1) err(1, "Close failed :%s", infile); pnew = malloc(newsize + 1); if (pnew == NULL)err(1, NULL); 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"); ctrl[i] = offtin(buf); }; /* Sanity-check */ if (newpos + ctrl[0] > newsize) errx(1, "Corrupt patch\n"); /* Read diff string */ lenread = BZ2_bzRead(&dbz2err, dpfbz2, pnew + newpos, ctrl[0]); if ((lenread < ctrl[0]) || ((dbz2err != BZ_OK) && (dbz2err != BZ_STREAM_END))) errx(1, "Corrupt patch\n"); /* Add pold data to diff string */ for (i = 0;i < ctrl[0];i++) if ((oldpos + i >= 0) && (oldpos + i < oldsize)) pnew[newpos + i] += pold[oldpos + i]; /* Adjust pointers */ newpos += ctrl[0]; oldpos += ctrl[0]; /* Sanity-check */ if (newpos + ctrl[1] > newsize) errx(1, "Corrupt patch\n"); /* Read extra string */ lenread = BZ2_bzRead(&ebz2err, epfbz2, pnew + newpos, ctrl[1]); if ((lenread < ctrl[1]) || ((ebz2err != BZ_OK) && (ebz2err != BZ_STREAM_END))) errx(1, "Corrupt patch\n"); /* 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)", patchfile); /* Write the pnew file */ fs = fopen(outfile, "wb"); if (fs == NULL)err(1, "Create failed :%s", outfile); if (fwrite(pnew, 1, newsize, fs) == -1)err(1, "Write failed :%s", outfile); if (fclose(fs) == -1)err(1, "Close failed :%s", outfile); free(pnew); free(pold); return 0; }