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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "app/data_pack.h"
#include <errno.h>
#include "base/file_util.h"
#include "base/logging.h"
#include "base/metrics/histogram.h"
#include "base/ref_counted_memory.h"
#include "base/string_piece.h"
// For details of the file layout, see
// http://dev.chromium.org/developers/design-documents/linuxresourcesandlocalizedstrings
namespace {
// A word is four bytes.
static const size_t kWord = 4;
static const uint32 kFileFormatVersion = 1;
// Length of file header: version and entry count.
static const size_t kHeaderLength = 2 * sizeof(uint32);
struct DataPackEntry {
uint32 resource_id;
uint32 file_offset;
uint32 length;
static int CompareById(const void* void_key, const void* void_entry) {
uint32 key = *reinterpret_cast<const uint32*>(void_key);
const DataPackEntry* entry =
reinterpret_cast<const DataPackEntry*>(void_entry);
if (key < entry->resource_id) {
return -1;
} else if (key > entry->resource_id) {
return 1;
} else {
return 0;
}
}
};
COMPILE_ASSERT(sizeof(DataPackEntry) == 12, size_of_header_must_be_twelve);
// We're crashing when trying to load a pak file on Windows. Add some error
// codes for logging.
// http://crbug.com/58056
enum LoadErrors {
INIT_FAILED = 1,
BAD_VERSION,
INDEX_TRUNCATED,
ENTRY_NOT_FOUND,
LOAD_ERRORS_COUNT,
};
} // anonymous namespace
namespace app {
// In .cc for MemoryMappedFile dtor.
DataPack::DataPack() : resource_count_(0) {
}
DataPack::~DataPack() {
}
bool DataPack::Load(const FilePath& path) {
mmap_.reset(new file_util::MemoryMappedFile);
if (!mmap_->Initialize(path)) {
DLOG(ERROR) << "Failed to mmap datapack";
UMA_HISTOGRAM_ENUMERATION("DataPack.Load", INIT_FAILED,
LOAD_ERRORS_COUNT);
return false;
}
// Parse the header of the file.
// First uint32: version; second: resource count.
const uint32* ptr = reinterpret_cast<const uint32*>(mmap_->data());
uint32 version = ptr[0];
if (version != kFileFormatVersion) {
LOG(ERROR) << "Bad data pack version: got " << version << ", expected "
<< kFileFormatVersion;
UMA_HISTOGRAM_ENUMERATION("DataPack.Load", BAD_VERSION,
LOAD_ERRORS_COUNT);
mmap_.reset();
return false;
}
resource_count_ = ptr[1];
// Sanity check the file.
// 1) Check we have enough entries.
if (kHeaderLength + resource_count_ * sizeof(DataPackEntry) >
mmap_->length()) {
LOG(ERROR) << "Data pack file corruption: too short for number of "
"entries specified.";
UMA_HISTOGRAM_ENUMERATION("DataPack.Load", INDEX_TRUNCATED,
LOAD_ERRORS_COUNT);
mmap_.reset();
return false;
}
// 2) Verify the entries are within the appropriate bounds.
for (size_t i = 0; i < resource_count_; ++i) {
const DataPackEntry* entry = reinterpret_cast<const DataPackEntry*>(
mmap_->data() + kHeaderLength + (i * sizeof(DataPackEntry)));
if (entry->file_offset + entry->length > mmap_->length()) {
LOG(ERROR) << "Entry #" << i << " in data pack points off end of file. "
<< "Was the file corrupted?";
UMA_HISTOGRAM_ENUMERATION("DataPack.Load", ENTRY_NOT_FOUND,
LOAD_ERRORS_COUNT);
mmap_.reset();
return false;
}
}
return true;
}
bool DataPack::GetStringPiece(uint32 resource_id,
base::StringPiece* data) const {
// It won't be hard to make this endian-agnostic, but it's not worth
// bothering to do right now.
#if defined(__BYTE_ORDER)
// Linux check
COMPILE_ASSERT(__BYTE_ORDER == __LITTLE_ENDIAN,
datapack_assumes_little_endian);
#elif defined(__BIG_ENDIAN__)
// Mac check
#error DataPack assumes little endian
#endif
DataPackEntry* target = reinterpret_cast<DataPackEntry*>(
bsearch(&resource_id, mmap_->data() + kHeaderLength, resource_count_,
sizeof(DataPackEntry), DataPackEntry::CompareById));
if (!target) {
return false;
}
data->set(mmap_->data() + target->file_offset, target->length);
return true;
}
RefCountedStaticMemory* DataPack::GetStaticMemory(uint32 resource_id) const {
base::StringPiece piece;
if (!GetStringPiece(resource_id, &piece))
return NULL;
return new RefCountedStaticMemory(
reinterpret_cast<const unsigned char*>(piece.data()), piece.length());
}
// static
bool DataPack::WritePack(const FilePath& path,
const std::map<uint32, base::StringPiece>& resources) {
FILE* file = file_util::OpenFile(path, "wb");
if (!file)
return false;
if (fwrite(&kFileFormatVersion, 1, kWord, file) != kWord) {
LOG(ERROR) << "Failed to write file version";
file_util::CloseFile(file);
return false;
}
// Note: the python version of this function explicitly sorted keys, but
// std::map is a sorted associative container, we shouldn't have to do that.
uint32 entry_count = resources.size();
if (fwrite(&entry_count, 1, kWord, file) != kWord) {
LOG(ERROR) << "Failed to write entry count";
file_util::CloseFile(file);
return false;
}
// Each entry is 3 uint32s.
uint32 index_length = entry_count * 3 * kWord;
uint32 data_offset = kHeaderLength + index_length;
for (std::map<uint32, base::StringPiece>::const_iterator it =
resources.begin();
it != resources.end(); ++it) {
if (fwrite(&it->first, 1, kWord, file) != kWord) {
LOG(ERROR) << "Failed to write id for " << it->first;
file_util::CloseFile(file);
return false;
}
if (fwrite(&data_offset, 1, kWord, file) != kWord) {
LOG(ERROR) << "Failed to write offset for " << it->first;
file_util::CloseFile(file);
return false;
}
uint32 len = it->second.length();
if (fwrite(&len, 1, kWord, file) != kWord) {
LOG(ERROR) << "Failed to write length for " << it->first;
file_util::CloseFile(file);
return false;
}
data_offset += len;
}
for (std::map<uint32, base::StringPiece>::const_iterator it =
resources.begin();
it != resources.end(); ++it) {
if (fwrite(it->second.data(), it->second.length(), 1, file) != 1) {
LOG(ERROR) << "Failed to write data for " << it->first;
file_util::CloseFile(file);
return false;
}
}
file_util::CloseFile(file);
return true;
}
} // namespace app
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