233 lines
7.5 KiB
C
233 lines
7.5 KiB
C
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/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// This file is a nearly line-for-line copy of bspatch.c from the
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// bsdiff-4.3 distribution; the primary differences being how the
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// input and output data are read and the error handling. Running
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// applypatch with the -l option will display the bsdiff license
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// notice.
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#include <stdio.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <unistd.h>
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#include <string.h>
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#include <bzlib.h>
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#include "mincrypt/sha.h"
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void ShowBSDiffLicense() {
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puts("The bsdiff library used herein is:\n"
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"\n"
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"Copyright 2003-2005 Colin Percival\n"
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"All rights reserved\n"
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"\n"
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"Redistribution and use in source and binary forms, with or without\n"
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"modification, are permitted providing that the following conditions\n"
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"are met:\n"
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"1. Redistributions of source code must retain the above copyright\n"
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" notice, this list of conditions and the following disclaimer.\n"
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"2. Redistributions in binary form must reproduce the above copyright\n"
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" notice, this list of conditions and the following disclaimer in the\n"
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" documentation and/or other materials provided with the distribution.\n"
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"\n"
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"THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR\n"
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"IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED\n"
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"WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\n"
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"ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY\n"
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"DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL\n"
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"DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS\n"
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"OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)\n"
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"HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,\n"
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"STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING\n"
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"IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE\n"
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"POSSIBILITY OF SUCH DAMAGE.\n"
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"\n------------------\n\n"
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"This program uses Julian R Seward's \"libbzip2\" library, available\n"
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"from http://www.bzip.org/.\n"
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);
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}
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static off_t offtin(u_char *buf)
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{
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off_t 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 ApplyBSDiffPatch(const unsigned char* old_data, ssize_t old_size,
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const char* patch_filename,
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FILE* output, SHA_CTX* ctx) {
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FILE* f;
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if ((f = fopen(patch_filename, "rb")) == NULL) {
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fprintf(stderr, "failed to open patch file\n");
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return 1;
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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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unsigned char header[32];
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if (fread(header, 1, 32, f) < 32) {
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fprintf(stderr, "failed to read patch file header\n");
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return 1;
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}
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if (memcmp(header, "BSDIFF40", 8) != 0) {
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fprintf(stderr, "corrupt patch file header (magic number)\n");
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return 1;
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}
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ssize_t ctrl_len, data_len;
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ssize_t new_size;
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ctrl_len = offtin(header+8);
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data_len = offtin(header+16);
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new_size = offtin(header+24);
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if (ctrl_len < 0 || data_len < 0 || new_size < 0) {
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fprintf(stderr, "corrupt patch file header (data lengths)\n");
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return 1;
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}
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fclose(f);
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int bzerr;
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#define OPEN_AT(f, bzf, offset) \
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FILE* f; \
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BZFILE* bzf; \
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if ((f = fopen(patch_filename, "rb")) == NULL) { \
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fprintf(stderr, "failed to open patch file\n"); \
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return 1; \
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} \
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if (fseeko(f, offset, SEEK_SET)) { \
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fprintf(stderr, "failed to seek in patch file\n"); \
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return 1; \
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} \
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if ((bzf = BZ2_bzReadOpen(&bzerr, f, 0, 0, NULL, 0)) == NULL) { \
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fprintf(stderr, "failed to bzReadOpen in patch file (%d)\n", bzerr); \
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return 1; \
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}
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OPEN_AT(cpf, cpfbz2, 32);
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OPEN_AT(dpf, dpfbz2, 32+ctrl_len);
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OPEN_AT(epf, epfbz2, 32+ctrl_len+data_len);
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#undef OPEN_AT
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unsigned char* new_data = malloc(new_size);
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if (new_data == NULL) {
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fprintf(stderr, "failed to allocate memory for output file\n");
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return 1;
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}
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off_t oldpos = 0, newpos = 0;
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off_t ctrl[3];
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off_t len_read;
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int i;
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unsigned char buf[8];
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while (newpos < new_size) {
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// Read control data
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for (i = 0; i < 3; ++i) {
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len_read = BZ2_bzRead(&bzerr, cpfbz2, buf, 8);
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if (len_read < 8 || !(bzerr == BZ_OK || bzerr == BZ_STREAM_END)) {
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fprintf(stderr, "corrupt patch (read control)\n");
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return 1;
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}
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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] > new_size) {
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fprintf(stderr, "corrupt patch (new file overrun)\n");
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return 1;
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}
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// Read diff string
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len_read = BZ2_bzRead(&bzerr, dpfbz2, new_data + newpos, ctrl[0]);
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if (len_read < ctrl[0] || !(bzerr == BZ_OK || bzerr == BZ_STREAM_END)) {
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fprintf(stderr, "corrupt patch (read diff)\n");
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return 1;
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}
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// Add old 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 < old_size)) {
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new_data[newpos+i] += old_data[oldpos+i];
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}
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}
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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] > new_size) {
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fprintf(stderr, "corrupt patch (new file overrun)\n");
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return 1;
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}
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// Read extra string
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len_read = BZ2_bzRead(&bzerr, epfbz2, new_data + newpos, ctrl[1]);
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if (len_read < ctrl[1] || !(bzerr == BZ_OK || bzerr == BZ_STREAM_END)) {
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fprintf(stderr, "corrupt patch (read extra)\n");
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return 1;
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}
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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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BZ2_bzReadClose(&bzerr, cpfbz2);
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BZ2_bzReadClose(&bzerr, dpfbz2);
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BZ2_bzReadClose(&bzerr, epfbz2);
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fclose(cpf);
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fclose(dpf);
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fclose(epf);
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if (fwrite(new_data, 1, new_size, output) < new_size) {
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fprintf(stderr, "short write of output: %d (%s)\n", errno, strerror(errno));
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return 1;
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}
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SHA_update(ctx, new_data, new_size);
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free(new_data);
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return 0;
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}
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