232 lines
7 KiB
C++
232 lines
7 KiB
C++
/*
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* Copyright (C) 2009 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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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "applypatch.h"
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#include "edify/expr.h"
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#include "openssl/sha.h"
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static int CheckMode(int argc, char** argv) {
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if (argc < 3) {
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return 2;
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}
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return applypatch_check(argv[2], argc-3, argv+3);
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}
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static int SpaceMode(int argc, char** argv) {
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if (argc != 3) {
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return 2;
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}
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char* endptr;
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size_t bytes = strtol(argv[2], &endptr, 10);
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if (bytes == 0 && endptr == argv[2]) {
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printf("can't parse \"%s\" as byte count\n\n", argv[2]);
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return 1;
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}
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return CacheSizeCheck(bytes);
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}
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// Parse arguments (which should be of the form "<sha1>" or
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// "<sha1>:<filename>" into the new parallel arrays *sha1s and
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// *patches (loading file contents into the patches). Returns true on
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// success.
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static bool ParsePatchArgs(int argc, char** argv, char*** sha1s,
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Value*** patches, int* num_patches) {
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*num_patches = argc;
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*sha1s = reinterpret_cast<char**>(malloc(*num_patches * sizeof(char*)));
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*patches = reinterpret_cast<Value**>(malloc(*num_patches * sizeof(Value*)));
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memset(*patches, 0, *num_patches * sizeof(Value*));
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uint8_t digest[SHA_DIGEST_LENGTH];
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for (int i = 0; i < *num_patches; ++i) {
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char* colon = strchr(argv[i], ':');
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if (colon != NULL) {
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*colon = '\0';
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++colon;
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}
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if (ParseSha1(argv[i], digest) != 0) {
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printf("failed to parse sha1 \"%s\"\n", argv[i]);
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return false;
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}
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(*sha1s)[i] = argv[i];
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if (colon == NULL) {
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(*patches)[i] = NULL;
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} else {
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FileContents fc;
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if (LoadFileContents(colon, &fc) != 0) {
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goto abort;
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}
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(*patches)[i] = reinterpret_cast<Value*>(malloc(sizeof(Value)));
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(*patches)[i]->type = VAL_BLOB;
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(*patches)[i]->size = fc.size;
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(*patches)[i]->data = reinterpret_cast<char*>(fc.data);
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}
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}
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return true;
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abort:
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for (int i = 0; i < *num_patches; ++i) {
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Value* p = (*patches)[i];
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if (p != NULL) {
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free(p->data);
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free(p);
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}
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}
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free(*sha1s);
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free(*patches);
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return false;
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}
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static int FlashMode(const char* src_filename, const char* tgt_filename,
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const char* tgt_sha1, size_t tgt_size) {
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return applypatch_flash(src_filename, tgt_filename, tgt_sha1, tgt_size);
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}
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static int PatchMode(int argc, char** argv) {
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Value* bonus = NULL;
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if (argc >= 3 && strcmp(argv[1], "-b") == 0) {
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FileContents fc;
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if (LoadFileContents(argv[2], &fc) != 0) {
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printf("failed to load bonus file %s\n", argv[2]);
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return 1;
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}
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bonus = reinterpret_cast<Value*>(malloc(sizeof(Value)));
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bonus->type = VAL_BLOB;
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bonus->size = fc.size;
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bonus->data = (char*)fc.data;
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argc -= 2;
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argv += 2;
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}
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if (argc < 4) {
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return 2;
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}
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char* endptr;
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size_t target_size = strtol(argv[4], &endptr, 10);
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if (target_size == 0 && endptr == argv[4]) {
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printf("can't parse \"%s\" as byte count\n\n", argv[4]);
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return 1;
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}
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// If no <src-sha1>:<patch> is provided, it is in flash mode.
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if (argc == 5) {
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if (bonus != NULL) {
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printf("bonus file not supported in flash mode\n");
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return 1;
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}
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return FlashMode(argv[1], argv[2], argv[3], target_size);
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}
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char** sha1s;
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Value** patches;
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int num_patches;
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if (!ParsePatchArgs(argc-5, argv+5, &sha1s, &patches, &num_patches)) {
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printf("failed to parse patch args\n");
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return 1;
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}
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int result = applypatch(argv[1], argv[2], argv[3], target_size,
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num_patches, sha1s, patches, bonus);
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int i;
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for (i = 0; i < num_patches; ++i) {
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Value* p = patches[i];
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if (p != NULL) {
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free(p->data);
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free(p);
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}
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}
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if (bonus) {
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free(bonus->data);
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free(bonus);
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}
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free(sha1s);
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free(patches);
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return result;
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}
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// This program applies binary patches to files in a way that is safe
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// (the original file is not touched until we have the desired
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// replacement for it) and idempotent (it's okay to run this program
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// multiple times).
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//
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// - if the sha1 hash of <tgt-file> is <tgt-sha1>, does nothing and exits
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// successfully.
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//
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// - otherwise, if no <src-sha1>:<patch> is provided, flashes <tgt-file> with
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// <src-file>. <tgt-file> must be a partition name, while <src-file> must
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// be a regular image file. <src-file> will not be deleted on success.
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//
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// - otherwise, if the sha1 hash of <src-file> is <src-sha1>, applies the
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// bsdiff <patch> to <src-file> to produce a new file (the type of patch
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// is automatically detected from the file header). If that new
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// file has sha1 hash <tgt-sha1>, moves it to replace <tgt-file>, and
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// exits successfully. Note that if <src-file> and <tgt-file> are
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// not the same, <src-file> is NOT deleted on success. <tgt-file>
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// may be the string "-" to mean "the same as src-file".
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//
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// - otherwise, or if any error is encountered, exits with non-zero
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// status.
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//
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// <src-file> (or <file> in check mode) may refer to an MTD partition
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// to read the source data. See the comments for the
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// LoadMTDContents() function above for the format of such a filename.
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int main(int argc, char** argv) {
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if (argc < 2) {
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usage:
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printf(
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"usage: %s [-b <bonus-file>] <src-file> <tgt-file> <tgt-sha1> <tgt-size> "
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"[<src-sha1>:<patch> ...]\n"
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" or %s -c <file> [<sha1> ...]\n"
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" or %s -s <bytes>\n"
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" or %s -l\n"
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"\n"
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"Filenames may be of the form\n"
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" MTD:<partition>:<len_1>:<sha1_1>:<len_2>:<sha1_2>:...\n"
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"to specify reading from or writing to an MTD partition.\n\n",
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argv[0], argv[0], argv[0], argv[0]);
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return 2;
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}
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int result;
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if (strncmp(argv[1], "-l", 3) == 0) {
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result = ShowLicenses();
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} else if (strncmp(argv[1], "-c", 3) == 0) {
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result = CheckMode(argc, argv);
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} else if (strncmp(argv[1], "-s", 3) == 0) {
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result = SpaceMode(argc, argv);
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} else {
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result = PatchMode(argc, argv);
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}
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if (result == 2) {
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goto usage;
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}
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return result;
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}
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