390 lines
11 KiB
C++
390 lines
11 KiB
C++
/*
|
|
* Copyright (C) 2015 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 "entry_name_utils-inl.h"
|
|
#include "zip_archive_common.h"
|
|
#include "ziparchive/zip_writer.h"
|
|
|
|
#include <utils/Log.h>
|
|
|
|
#include <cassert>
|
|
#include <cstdio>
|
|
#include <memory>
|
|
#include <zlib.h>
|
|
#define DEF_MEM_LEVEL 8 // normally in zutil.h?
|
|
|
|
/* Zip compression methods we support */
|
|
enum {
|
|
kCompressStored = 0, // no compression
|
|
kCompressDeflated = 8, // standard deflate
|
|
};
|
|
|
|
// Size of the output buffer used for compression.
|
|
static const size_t kBufSize = 32768u;
|
|
|
|
// No error, operation completed successfully.
|
|
static const int32_t kNoError = 0;
|
|
|
|
// The ZipWriter is in a bad state.
|
|
static const int32_t kInvalidState = -1;
|
|
|
|
// There was an IO error while writing to disk.
|
|
static const int32_t kIoError = -2;
|
|
|
|
// The zip entry name was invalid.
|
|
static const int32_t kInvalidEntryName = -3;
|
|
|
|
// An error occurred in zlib.
|
|
static const int32_t kZlibError = -4;
|
|
|
|
static const char* sErrorCodes[] = {
|
|
"Invalid state",
|
|
"IO error",
|
|
"Invalid entry name",
|
|
"Zlib error",
|
|
};
|
|
|
|
const char* ZipWriter::ErrorCodeString(int32_t error_code) {
|
|
if (error_code < 0 && (-error_code) < static_cast<int32_t>(arraysize(sErrorCodes))) {
|
|
return sErrorCodes[-error_code];
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
static void DeleteZStream(z_stream* stream) {
|
|
deflateEnd(stream);
|
|
delete stream;
|
|
}
|
|
|
|
ZipWriter::ZipWriter(FILE* f) : file_(f), current_offset_(0), state_(State::kWritingZip),
|
|
z_stream_(nullptr, DeleteZStream), buffer_(kBufSize) {
|
|
}
|
|
|
|
ZipWriter::ZipWriter(ZipWriter&& writer) : file_(writer.file_),
|
|
current_offset_(writer.current_offset_),
|
|
state_(writer.state_),
|
|
files_(std::move(writer.files_)),
|
|
z_stream_(std::move(writer.z_stream_)),
|
|
buffer_(std::move(writer.buffer_)){
|
|
writer.file_ = nullptr;
|
|
writer.state_ = State::kError;
|
|
}
|
|
|
|
ZipWriter& ZipWriter::operator=(ZipWriter&& writer) {
|
|
file_ = writer.file_;
|
|
current_offset_ = writer.current_offset_;
|
|
state_ = writer.state_;
|
|
files_ = std::move(writer.files_);
|
|
z_stream_ = std::move(writer.z_stream_);
|
|
buffer_ = std::move(writer.buffer_);
|
|
writer.file_ = nullptr;
|
|
writer.state_ = State::kError;
|
|
return *this;
|
|
}
|
|
|
|
int32_t ZipWriter::HandleError(int32_t error_code) {
|
|
state_ = State::kError;
|
|
z_stream_.reset();
|
|
return error_code;
|
|
}
|
|
|
|
int32_t ZipWriter::StartEntry(const char* path, size_t flags) {
|
|
return StartEntryWithTime(path, flags, time_t());
|
|
}
|
|
|
|
static void ExtractTimeAndDate(time_t when, uint16_t* out_time, uint16_t* out_date) {
|
|
/* round up to an even number of seconds */
|
|
when = static_cast<time_t>((static_cast<unsigned long>(when) + 1) & (~1));
|
|
|
|
struct tm* ptm;
|
|
#if !defined(_WIN32)
|
|
struct tm tm_result;
|
|
ptm = localtime_r(&when, &tm_result);
|
|
#else
|
|
ptm = localtime(&when);
|
|
#endif
|
|
|
|
int year = ptm->tm_year;
|
|
if (year < 80) {
|
|
year = 80;
|
|
}
|
|
|
|
*out_date = (year - 80) << 9 | (ptm->tm_mon + 1) << 5 | ptm->tm_mday;
|
|
*out_time = ptm->tm_hour << 11 | ptm->tm_min << 5 | ptm->tm_sec >> 1;
|
|
}
|
|
|
|
int32_t ZipWriter::StartEntryWithTime(const char* path, size_t flags, time_t time) {
|
|
if (state_ != State::kWritingZip) {
|
|
return kInvalidState;
|
|
}
|
|
|
|
FileInfo fileInfo = {};
|
|
fileInfo.path = std::string(path);
|
|
fileInfo.local_file_header_offset = current_offset_;
|
|
|
|
if (!IsValidEntryName(reinterpret_cast<const uint8_t*>(fileInfo.path.data()),
|
|
fileInfo.path.size())) {
|
|
return kInvalidEntryName;
|
|
}
|
|
|
|
LocalFileHeader header = {};
|
|
header.lfh_signature = LocalFileHeader::kSignature;
|
|
|
|
// Set this flag to denote that a DataDescriptor struct will appear after the data,
|
|
// containing the crc and size fields.
|
|
header.gpb_flags |= kGPBDDFlagMask;
|
|
|
|
if (flags & ZipWriter::kCompress) {
|
|
fileInfo.compression_method = kCompressDeflated;
|
|
|
|
int32_t result = PrepareDeflate();
|
|
if (result != kNoError) {
|
|
return result;
|
|
}
|
|
} else {
|
|
fileInfo.compression_method = kCompressStored;
|
|
}
|
|
header.compression_method = fileInfo.compression_method;
|
|
|
|
ExtractTimeAndDate(time, &fileInfo.last_mod_time, &fileInfo.last_mod_date);
|
|
header.last_mod_time = fileInfo.last_mod_time;
|
|
header.last_mod_date = fileInfo.last_mod_date;
|
|
|
|
header.file_name_length = fileInfo.path.size();
|
|
|
|
off64_t offset = current_offset_ + sizeof(header) + fileInfo.path.size();
|
|
if ((flags & ZipWriter::kAlign32) && (offset & 0x03)) {
|
|
// Pad the extra field so the data will be aligned.
|
|
uint16_t padding = 4 - (offset % 4);
|
|
header.extra_field_length = padding;
|
|
offset += padding;
|
|
}
|
|
|
|
if (fwrite(&header, sizeof(header), 1, file_) != 1) {
|
|
return HandleError(kIoError);
|
|
}
|
|
|
|
if (fwrite(path, sizeof(*path), fileInfo.path.size(), file_) != fileInfo.path.size()) {
|
|
return HandleError(kIoError);
|
|
}
|
|
|
|
if (fwrite("\0\0\0", 1, header.extra_field_length, file_) != header.extra_field_length) {
|
|
return HandleError(kIoError);
|
|
}
|
|
|
|
files_.emplace_back(std::move(fileInfo));
|
|
|
|
current_offset_ = offset;
|
|
state_ = State::kWritingEntry;
|
|
return kNoError;
|
|
}
|
|
|
|
int32_t ZipWriter::PrepareDeflate() {
|
|
assert(state_ == State::kWritingZip);
|
|
|
|
// Initialize the z_stream for compression.
|
|
z_stream_ = std::unique_ptr<z_stream, void(*)(z_stream*)>(new z_stream(), DeleteZStream);
|
|
|
|
int zerr = deflateInit2(z_stream_.get(), Z_BEST_COMPRESSION, Z_DEFLATED, -MAX_WBITS,
|
|
DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY);
|
|
if (zerr != Z_OK) {
|
|
if (zerr == Z_VERSION_ERROR) {
|
|
ALOGE("Installed zlib is not compatible with linked version (%s)", ZLIB_VERSION);
|
|
return HandleError(kZlibError);
|
|
} else {
|
|
ALOGE("deflateInit2 failed (zerr=%d)", zerr);
|
|
return HandleError(kZlibError);
|
|
}
|
|
}
|
|
|
|
z_stream_->next_out = buffer_.data();
|
|
z_stream_->avail_out = buffer_.size();
|
|
return kNoError;
|
|
}
|
|
|
|
int32_t ZipWriter::WriteBytes(const void* data, size_t len) {
|
|
if (state_ != State::kWritingEntry) {
|
|
return HandleError(kInvalidState);
|
|
}
|
|
|
|
FileInfo& currentFile = files_.back();
|
|
int32_t result = kNoError;
|
|
if (currentFile.compression_method & kCompressDeflated) {
|
|
result = CompressBytes(¤tFile, data, len);
|
|
} else {
|
|
result = StoreBytes(¤tFile, data, len);
|
|
}
|
|
|
|
if (result != kNoError) {
|
|
return result;
|
|
}
|
|
|
|
currentFile.crc32 = crc32(currentFile.crc32, reinterpret_cast<const Bytef*>(data), len);
|
|
currentFile.uncompressed_size += len;
|
|
return kNoError;
|
|
}
|
|
|
|
int32_t ZipWriter::StoreBytes(FileInfo* file, const void* data, size_t len) {
|
|
assert(state_ == State::kWritingEntry);
|
|
|
|
if (fwrite(data, 1, len, file_) != len) {
|
|
return HandleError(kIoError);
|
|
}
|
|
file->compressed_size += len;
|
|
current_offset_ += len;
|
|
return kNoError;
|
|
}
|
|
|
|
int32_t ZipWriter::CompressBytes(FileInfo* file, const void* data, size_t len) {
|
|
assert(state_ == State::kWritingEntry);
|
|
assert(z_stream_);
|
|
assert(z_stream_->next_out != nullptr);
|
|
assert(z_stream_->avail_out != 0);
|
|
|
|
// Prepare the input.
|
|
z_stream_->next_in = reinterpret_cast<const uint8_t*>(data);
|
|
z_stream_->avail_in = len;
|
|
|
|
while (z_stream_->avail_in > 0) {
|
|
// We have more data to compress.
|
|
int zerr = deflate(z_stream_.get(), Z_NO_FLUSH);
|
|
if (zerr != Z_OK) {
|
|
return HandleError(kZlibError);
|
|
}
|
|
|
|
if (z_stream_->avail_out == 0) {
|
|
// The output is full, let's write it to disk.
|
|
size_t dataToWrite = z_stream_->next_out - buffer_.data();
|
|
if (fwrite(buffer_.data(), 1, dataToWrite, file_) != dataToWrite) {
|
|
return HandleError(kIoError);
|
|
}
|
|
file->compressed_size += dataToWrite;
|
|
current_offset_ += dataToWrite;
|
|
|
|
// Reset the output buffer for the next input.
|
|
z_stream_->next_out = buffer_.data();
|
|
z_stream_->avail_out = buffer_.size();
|
|
}
|
|
}
|
|
return kNoError;
|
|
}
|
|
|
|
int32_t ZipWriter::FlushCompressedBytes(FileInfo* file) {
|
|
assert(state_ == State::kWritingEntry);
|
|
assert(z_stream_);
|
|
assert(z_stream_->next_out != nullptr);
|
|
assert(z_stream_->avail_out != 0);
|
|
|
|
int zerr = deflate(z_stream_.get(), Z_FINISH);
|
|
if (zerr != Z_STREAM_END) {
|
|
return HandleError(kZlibError);
|
|
}
|
|
|
|
size_t dataToWrite = z_stream_->next_out - buffer_.data();
|
|
if (dataToWrite != 0) {
|
|
if (fwrite(buffer_.data(), 1, dataToWrite, file_) != dataToWrite) {
|
|
return HandleError(kIoError);
|
|
}
|
|
file->compressed_size += dataToWrite;
|
|
current_offset_ += dataToWrite;
|
|
}
|
|
z_stream_.reset();
|
|
return kNoError;
|
|
}
|
|
|
|
int32_t ZipWriter::FinishEntry() {
|
|
if (state_ != State::kWritingEntry) {
|
|
return kInvalidState;
|
|
}
|
|
|
|
FileInfo& currentFile = files_.back();
|
|
if (currentFile.compression_method & kCompressDeflated) {
|
|
int32_t result = FlushCompressedBytes(¤tFile);
|
|
if (result != kNoError) {
|
|
return result;
|
|
}
|
|
}
|
|
|
|
const uint32_t sig = DataDescriptor::kOptSignature;
|
|
if (fwrite(&sig, sizeof(sig), 1, file_) != 1) {
|
|
state_ = State::kError;
|
|
return kIoError;
|
|
}
|
|
|
|
DataDescriptor dd = {};
|
|
dd.crc32 = currentFile.crc32;
|
|
dd.compressed_size = currentFile.compressed_size;
|
|
dd.uncompressed_size = currentFile.uncompressed_size;
|
|
if (fwrite(&dd, sizeof(dd), 1, file_) != 1) {
|
|
return HandleError(kIoError);
|
|
}
|
|
|
|
current_offset_ += sizeof(DataDescriptor::kOptSignature) + sizeof(dd);
|
|
state_ = State::kWritingZip;
|
|
return kNoError;
|
|
}
|
|
|
|
int32_t ZipWriter::Finish() {
|
|
if (state_ != State::kWritingZip) {
|
|
return kInvalidState;
|
|
}
|
|
|
|
off64_t startOfCdr = current_offset_;
|
|
for (FileInfo& file : files_) {
|
|
CentralDirectoryRecord cdr = {};
|
|
cdr.record_signature = CentralDirectoryRecord::kSignature;
|
|
cdr.gpb_flags |= kGPBDDFlagMask;
|
|
cdr.compression_method = file.compression_method;
|
|
cdr.last_mod_time = file.last_mod_time;
|
|
cdr.last_mod_date = file.last_mod_date;
|
|
cdr.crc32 = file.crc32;
|
|
cdr.compressed_size = file.compressed_size;
|
|
cdr.uncompressed_size = file.uncompressed_size;
|
|
cdr.file_name_length = file.path.size();
|
|
cdr.local_file_header_offset = file.local_file_header_offset;
|
|
if (fwrite(&cdr, sizeof(cdr), 1, file_) != 1) {
|
|
return HandleError(kIoError);
|
|
}
|
|
|
|
if (fwrite(file.path.data(), 1, file.path.size(), file_) != file.path.size()) {
|
|
return HandleError(kIoError);
|
|
}
|
|
|
|
current_offset_ += sizeof(cdr) + file.path.size();
|
|
}
|
|
|
|
EocdRecord er = {};
|
|
er.eocd_signature = EocdRecord::kSignature;
|
|
er.disk_num = 0;
|
|
er.cd_start_disk = 0;
|
|
er.num_records_on_disk = files_.size();
|
|
er.num_records = files_.size();
|
|
er.cd_size = current_offset_ - startOfCdr;
|
|
er.cd_start_offset = startOfCdr;
|
|
|
|
if (fwrite(&er, sizeof(er), 1, file_) != 1) {
|
|
return HandleError(kIoError);
|
|
}
|
|
|
|
if (fflush(file_) != 0) {
|
|
return HandleError(kIoError);
|
|
}
|
|
|
|
current_offset_ += sizeof(er);
|
|
state_ = State::kDone;
|
|
return kNoError;
|
|
}
|