/*
* Copyright (C) 2009 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <memory>
#include <vector>
#include "applypatch.h"
#include "edify/expr.h"
#include "openssl/sha.h"
static int CheckMode(int argc, char** argv) {
if (argc < 3) {
return 2;
}
return applypatch_check(argv[2], argc-3, argv+3);
}
static int SpaceMode(int argc, char** argv) {
if (argc != 3) {
return 2;
}
char* endptr;
size_t bytes = strtol(argv[2], &endptr, 10);
if (bytes == 0 && endptr == argv[2]) {
printf("can't parse \"%s\" as byte count\n\n", argv[2]);
return 1;
}
return CacheSizeCheck(bytes);
}
// Parse arguments (which should be of the form "<sha1>:<filename>"
// into the new parallel arrays *sha1s and *files.Returns true on
// success.
static bool ParsePatchArgs(int argc, char** argv, std::vector<char*>* sha1s,
std::vector<FileContents>* files) {
uint8_t digest[SHA_DIGEST_LENGTH];
for (int i = 0; i < argc; ++i) {
char* colon = strchr(argv[i], ':');
if (colon == nullptr) {
printf("no ':' in patch argument \"%s\"\n", argv[i]);
return false;
}
*colon = '\0';
++colon;
if (ParseSha1(argv[i], digest) != 0) {
printf("failed to parse sha1 \"%s\"\n", argv[i]);
return false;
}
sha1s->push_back(argv[i]);
FileContents fc;
if (LoadFileContents(colon, &fc) != 0) {
return false;
}
files->push_back(std::move(fc));
}
return true;
}
static int FlashMode(const char* src_filename, const char* tgt_filename,
const char* tgt_sha1, size_t tgt_size) {
return applypatch_flash(src_filename, tgt_filename, tgt_sha1, tgt_size);
}
static int PatchMode(int argc, char** argv) {
FileContents bonusFc;
Value bonusValue;
Value* bonus = nullptr;
if (argc >= 3 && strcmp(argv[1], "-b") == 0) {
if (LoadFileContents(argv[2], &bonusFc) != 0) {
printf("failed to load bonus file %s\n", argv[2]);
return 1;
}
bonus = &bonusValue;
bonus->type = VAL_BLOB;
bonus->size = bonusFc.data.size();
bonus->data = reinterpret_cast<char*>(bonusFc.data.data());
argc -= 2;
argv += 2;
}
if (argc < 4) {
return 2;
}
char* endptr;
size_t target_size = strtol(argv[4], &endptr, 10);
if (target_size == 0 && endptr == argv[4]) {
printf("can't parse \"%s\" as byte count\n\n", argv[4]);
return 1;
}
// If no <src-sha1>:<patch> is provided, it is in flash mode.
if (argc == 5) {
if (bonus != nullptr) {
printf("bonus file not supported in flash mode\n");
return 1;
}
return FlashMode(argv[1], argv[2], argv[3], target_size);
}
std::vector<char*> sha1s;
std::vector<FileContents> files;
if (!ParsePatchArgs(argc-5, argv+5, &sha1s, &files)) {
printf("failed to parse patch args\n");
return 1;
}
std::vector<Value> patches(files.size());
std::vector<Value*> patch_ptrs(files.size());
for (size_t i = 0; i < files.size(); ++i) {
patches[i].type = VAL_BLOB;
patches[i].size = files[i].data.size();
patches[i].data = reinterpret_cast<char*>(files[i].data.data());
patch_ptrs[i] = &patches[i];
}
return applypatch(argv[1], argv[2], argv[3], target_size,
patch_ptrs.size(), sha1s.data(),
patch_ptrs.data(), bonus);
}
// This program applies binary patches to files in a way that is safe
// (the original file is not touched until we have the desired
// replacement for it) and idempotent (it's okay to run this program
// multiple times).
//
// - if the sha1 hash of <tgt-file> is <tgt-sha1>, does nothing and exits
// successfully.
//
// - otherwise, if no <src-sha1>:<patch> is provided, flashes <tgt-file> with
// <src-file>. <tgt-file> must be a partition name, while <src-file> must
// be a regular image file. <src-file> will not be deleted on success.
//
// - otherwise, if the sha1 hash of <src-file> is <src-sha1>, applies the
// bsdiff <patch> to <src-file> to produce a new file (the type of patch
// is automatically detected from the file header). If that new
// file has sha1 hash <tgt-sha1>, moves it to replace <tgt-file>, and
// exits successfully. Note that if <src-file> and <tgt-file> are
// not the same, <src-file> is NOT deleted on success. <tgt-file>
// may be the string "-" to mean "the same as src-file".
//
// - otherwise, or if any error is encountered, exits with non-zero
// status.
//
// <src-file> (or <file> in check mode) may refer to an MTD partition
// to read the source data. See the comments for the
// LoadMTDContents() function above for the format of such a filename.
int main(int argc, char** argv) {
if (argc < 2) {
usage:
printf(
"usage: %s [-b <bonus-file>] <src-file> <tgt-file> <tgt-sha1> <tgt-size> "
"[<src-sha1>:<patch> ...]\n"
" or %s -c <file> [<sha1> ...]\n"
" or %s -s <bytes>\n"
" or %s -l\n"
"\n"
"Filenames may be of the form\n"
" MTD:<partition>:<len_1>:<sha1_1>:<len_2>:<sha1_2>:...\n"
"to specify reading from or writing to an MTD partition.\n\n",
argv[0], argv[0], argv[0], argv[0]);
return 2;
}
int result;
if (strncmp(argv[1], "-l", 3) == 0) {
result = ShowLicenses();
} else if (strncmp(argv[1], "-c", 3) == 0) {
result = CheckMode(argc, argv);
} else if (strncmp(argv[1], "-s", 3) == 0) {
result = SpaceMode(argc, argv);
} else {
result = PatchMode(argc, argv);
}
if (result == 2) {
goto usage;
}
return result;
}