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//
// Copyright (C) 2020 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 <unistd.h>
#include <iostream>
#include <string>
#include <android-base/logging.h>
#include <android-base/unique_fd.h>
#include <libsnapshot/cow_reader.h>
namespace android {
namespace snapshot {
void MyLogger(android::base::LogId, android::base::LogSeverity severity, const char*, const char*,
unsigned int, const char* message) {
if (severity == android::base::ERROR) {
fprintf(stderr, "%s\n", message);
} else {
fprintf(stdout, "%s\n", message);
}
}
static void usage(void) {
LOG(ERROR) << "Usage: inspect_cow [-sd] <COW_FILE>";
LOG(ERROR) << "\t -s Run Silent";
LOG(ERROR) << "\t -d Attempt to decompress";
LOG(ERROR) << "\t -b Show data for failed decompress\n";
}
// Sink that always appends to the end of a string.
class StringSink : public IByteSink {
public:
void* GetBuffer(size_t requested, size_t* actual) override {
size_t old_size = stream_.size();
stream_.resize(old_size + requested, '\0');
*actual = requested;
return stream_.data() + old_size;
}
bool ReturnData(void*, size_t) override { return true; }
void Reset() { stream_.clear(); }
std::string& stream() { return stream_; }
private:
std::string stream_;
};
static void ShowBad(CowReader& reader, const struct CowOperation& op) {
size_t count;
auto buffer = std::make_unique<uint8_t[]>(op.data_length);
if (!reader.GetRawBytes(op.source, buffer.get(), op.data_length, &count)) {
std::cerr << "Failed to read at all!\n";
} else {
std::cout << "The Block data is:\n";
for (int i = 0; i < op.data_length; i++) {
std::cout << std::hex << (int)buffer[i];
}
std::cout << std::dec << "\n\n";
if (op.data_length >= sizeof(CowOperation)) {
std::cout << "The start, as an op, would be " << *(CowOperation*)buffer.get() << "\n";
}
}
}
static bool Inspect(const std::string& path, bool silent, bool decompress, bool show_bad) {
android::base::unique_fd fd(open(path.c_str(), O_RDONLY));
if (fd < 0) {
PLOG(ERROR) << "open failed: " << path;
return false;
}
CowReader reader;
if (!reader.Parse(fd)) {
LOG(ERROR) << "parse failed: " << path;
return false;
}
CowHeader header;
if (!reader.GetHeader(&header)) {
LOG(ERROR) << "could not get header: " << path;
return false;
}
CowFooter footer;
bool has_footer = false;
if (reader.GetFooter(&footer)) has_footer = true;
if (!silent) {
std::cout << "Major version: " << header.major_version << "\n";
std::cout << "Minor version: " << header.minor_version << "\n";
std::cout << "Header size: " << header.header_size << "\n";
std::cout << "Footer size: " << header.footer_size << "\n";
std::cout << "Block size: " << header.block_size << "\n";
std::cout << "\n";
if (has_footer) {
std::cout << "Total Ops size: " << footer.op.ops_size << "\n";
std::cout << "Number of Ops: " << footer.op.num_ops << "\n";
std::cout << "\n";
}
}
auto iter = reader.GetOpIter();
StringSink sink;
bool success = true;
while (!iter->Done()) {
const CowOperation& op = iter->Get();
if (!silent) std::cout << op << "\n";
if (decompress && op.type == kCowReplaceOp && op.compression != kCowCompressNone) {
if (!reader.ReadData(op, &sink)) {
std::cerr << "Failed to decompress for :" << op << "\n";
success = false;
if (show_bad) ShowBad(reader, op);
}
sink.Reset();
}
iter->Next();
}
return success;
}
} // namespace snapshot
} // namespace android
int main(int argc, char** argv) {
int ch;
bool silent = false;
bool decompress = false;
bool show_bad = false;
while ((ch = getopt(argc, argv, "sdb")) != -1) {
switch (ch) {
case 's':
silent = true;
break;
case 'd':
decompress = true;
break;
case 'b':
show_bad = true;
break;
default:
android::snapshot::usage();
}
}
android::base::InitLogging(argv, android::snapshot::MyLogger);
if (argc < optind + 1) {
android::snapshot::usage();
return 1;
}
if (!android::snapshot::Inspect(argv[optind], silent, decompress, show_bad)) {
return 1;
}
return 0;
}
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