219 lines
6.3 KiB
C
219 lines
6.3 KiB
C
/*-
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* Copyright 2003-2005 Colin Percival
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* All rights reserved
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted providing that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef WIN32
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#include <io.h>
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#else
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#include <stdarg.h>
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#include <sys/types.h>
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#endif
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#include "../bzip2/bzlib.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <fcntl.h>
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#define errx err
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void err(int exitcode, const char * fmt, ...)
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{
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va_list valist;
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va_start(valist, fmt);
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vprintf(fmt, valist);
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va_end(valist);
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exit(exitcode);
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}
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static long offtin(u_char *buf)
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{
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long y;
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y = buf[7] & 0x7F;
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y = y * 256;y += buf[6];
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y = y * 256;y += buf[5];
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y = y * 256;y += buf[4];
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y = y * 256;y += buf[3];
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y = y * 256;y += buf[2];
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y = y * 256;y += buf[1];
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y = y * 256;y += buf[0];
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if (buf[7] & 0x80) y = -y;
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return y;
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}
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int apply_bspatch(const char *infile, const char *outfile, const char *patchfile)
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{
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FILE * f, *cpf, *dpf, *epf;
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BZFILE * cpfbz2, *dpfbz2, *epfbz2;
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int cbz2err, dbz2err, ebz2err;
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FILE * fs;
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long oldsize, newsize;
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long bzctrllen, bzdatalen;
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u_char header[32], buf[8];
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u_char *pold, *pnew;
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long oldpos, newpos;
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long ctrl[3];
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long lenread;
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long i;
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/* Open patch file */
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if ((f = fopen(patchfile, "r")) == NULL)
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err(1, "fopen(%s)", patchfile);
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/*
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File format:
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0 8 "BSDIFF40"
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8 8 X
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16 8 Y
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24 8 sizeof(newfile)
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32 X bzip2(control block)
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32+X Y bzip2(diff block)
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32+X+Y ??? bzip2(extra block)
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with control block a set of triples (x,y,z) meaning "add x bytes
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from oldfile to x bytes from the diff block; copy y bytes from the
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extra block; seek forwards in oldfile by z bytes".
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*/
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/* Read header */
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if (fread(header, 1, 32, f) < 32) {
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if (feof(f))
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errx(1, "Corrupt patch\n");
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err(1, "fread(%s)", patchfile);
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}
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/* Check for appropriate magic */
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if (memcmp(header, "BSDIFF40", 8) != 0)
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errx(1, "Corrupt patch\n");
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/* Read lengths from header */
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bzctrllen = offtin(header + 8);
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bzdatalen = offtin(header + 16);
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newsize = offtin(header + 24);
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if ((bzctrllen < 0) || (bzdatalen < 0) || (newsize < 0))
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errx(1, "Corrupt patch\n");
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/* Close patch file and re-open it via libbzip2 at the right places */
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if (fclose(f))
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err(1, "fclose(%s)", patchfile);
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if ((cpf = fopen(patchfile, "rb")) == NULL)
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err(1, "fopen(%s)", patchfile);
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if (fseek(cpf, 32, SEEK_SET))
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err(1, "fseeko(%s, %lld)", patchfile,
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(long long)32);
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if ((cpfbz2 = BZ2_bzReadOpen(&cbz2err, cpf, 0, 0, NULL, 0)) == NULL)
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errx(1, "BZ2_bzReadOpen, bz2err = %d", cbz2err);
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if ((dpf = fopen(patchfile, "rb")) == NULL)
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err(1, "fopen(%s)", patchfile);
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if (fseek(dpf, 32 + bzctrllen, SEEK_SET))
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err(1, "fseeko(%s, %lld)", patchfile,
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(long long)(32 + bzctrllen));
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if ((dpfbz2 = BZ2_bzReadOpen(&dbz2err, dpf, 0, 0, NULL, 0)) == NULL)
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errx(1, "BZ2_bzReadOpen, bz2err = %d", dbz2err);
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if ((epf = fopen(patchfile, "rb")) == NULL)
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err(1, "fopen(%s)", patchfile);
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if (fseek(epf, 32 + bzctrllen + bzdatalen, SEEK_SET))
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err(1, "fseeko(%s, %lld)", patchfile,
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(long long)(32 + bzctrllen + bzdatalen));
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if ((epfbz2 = BZ2_bzReadOpen(&ebz2err, epf, 0, 0, NULL, 0)) == NULL)
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errx(1, "BZ2_bzReadOpen, bz2err = %d", ebz2err);
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fs = fopen(infile, "rb");
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if (fs == NULL)err(1, "Open failed :%s", infile);
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if (fseek(fs, 0, SEEK_END) != 0)err(1, "Seek failed :%s", infile);
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oldsize = ftell(fs);
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pold = (u_char *)malloc(oldsize + 1);
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if (pold == NULL) err(1, "Malloc failed :%s", infile);
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fseek(fs, 0, SEEK_SET);
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if (fread(pold, 1, oldsize, fs) == -1) err(1, "Read failed :%s", infile);
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if (fclose(fs) == -1) err(1, "Close failed :%s", infile);
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pnew = malloc(newsize + 1);
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if (pnew == NULL)err(1, NULL);
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oldpos = 0;newpos = 0;
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while (newpos < newsize) {
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/* Read control data */
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for (i = 0;i <= 2;i++) {
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lenread = BZ2_bzRead(&cbz2err, cpfbz2, buf, 8);
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if ((lenread < 8) || ((cbz2err != BZ_OK) &&
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(cbz2err != BZ_STREAM_END)))
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errx(1, "Corrupt patch\n");
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ctrl[i] = offtin(buf);
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};
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/* Sanity-check */
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if (newpos + ctrl[0] > newsize)
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errx(1, "Corrupt patch\n");
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/* Read diff string */
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lenread = BZ2_bzRead(&dbz2err, dpfbz2, pnew + newpos, ctrl[0]);
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if ((lenread < ctrl[0]) ||
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((dbz2err != BZ_OK) && (dbz2err != BZ_STREAM_END)))
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errx(1, "Corrupt patch\n");
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/* Add pold data to diff string */
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for (i = 0;i < ctrl[0];i++)
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if ((oldpos + i >= 0) && (oldpos + i < oldsize))
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pnew[newpos + i] += pold[oldpos + i];
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/* Adjust pointers */
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newpos += ctrl[0];
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oldpos += ctrl[0];
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/* Sanity-check */
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if (newpos + ctrl[1] > newsize)
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errx(1, "Corrupt patch\n");
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/* Read extra string */
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lenread = BZ2_bzRead(&ebz2err, epfbz2, pnew + newpos, ctrl[1]);
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if ((lenread < ctrl[1]) ||
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((ebz2err != BZ_OK) && (ebz2err != BZ_STREAM_END)))
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errx(1, "Corrupt patch\n");
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/* Adjust pointers */
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newpos += ctrl[1];
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oldpos += ctrl[2];
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};
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/* Clean up the bzip2 reads */
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BZ2_bzReadClose(&cbz2err, cpfbz2);
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BZ2_bzReadClose(&dbz2err, dpfbz2);
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BZ2_bzReadClose(&ebz2err, epfbz2);
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if (fclose(cpf) || fclose(dpf) || fclose(epf))
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err(1, "fclose(%s)", patchfile);
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/* Write the pnew file */
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fs = fopen(outfile, "wb");
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if (fs == NULL)err(1, "Create failed :%s", outfile);
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if (fwrite(pnew, 1, newsize, fs) == -1)err(1, "Write failed :%s", outfile);
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if (fclose(fs) == -1)err(1, "Close failed :%s", outfile);
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free(pnew);
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free(pold);
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return 0;
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}
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