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mojo / mojo-tools / 2b73f4b16c93ea97b4604c2f6e31488e05d853c0 / . / net / disk_cache / simple / simple_synchronous_entry.cc
blob: f85910550ee2e3836d01e07d0df001b1d2c9928b [file] [log] [blame]
// Copyright (c) 2013 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 "net/disk_cache/simple/simple_synchronous_entry.h"
#include <algorithm>
#include <cstring>
#include <functional>
#include <limits>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/files/file_util.h"
#include "base/hash.h"
#include "base/location.h"
#include "base/numerics/safe_conversions.h"
#include "base/sha1.h"
#include "base/strings/stringprintf.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
#include "net/disk_cache/simple/simple_backend_version.h"
#include "net/disk_cache/simple/simple_histogram_macros.h"
#include "net/disk_cache/simple/simple_util.h"
#include "third_party/zlib/zlib.h"
using base::File;
using base::FilePath;
using base::Time;
namespace {
// Used in histograms, please only add entries at the end.
enum OpenEntryResult {
OPEN_ENTRY_SUCCESS = 0,
OPEN_ENTRY_PLATFORM_FILE_ERROR = 1,
OPEN_ENTRY_CANT_READ_HEADER = 2,
OPEN_ENTRY_BAD_MAGIC_NUMBER = 3,
OPEN_ENTRY_BAD_VERSION = 4,
OPEN_ENTRY_CANT_READ_KEY = 5,
// OPEN_ENTRY_KEY_MISMATCH = 6, Deprecated.
OPEN_ENTRY_KEY_HASH_MISMATCH = 7,
OPEN_ENTRY_SPARSE_OPEN_FAILED = 8,
OPEN_ENTRY_MAX = 9,
};
// Used in histograms, please only add entries at the end.
enum WriteResult {
WRITE_RESULT_SUCCESS = 0,
WRITE_RESULT_PRETRUNCATE_FAILURE,
WRITE_RESULT_WRITE_FAILURE,
WRITE_RESULT_TRUNCATE_FAILURE,
WRITE_RESULT_LAZY_STREAM_ENTRY_DOOMED,
WRITE_RESULT_LAZY_CREATE_FAILURE,
WRITE_RESULT_LAZY_INITIALIZE_FAILURE,
WRITE_RESULT_MAX,
};
// Used in histograms, please only add entries at the end.
enum CheckEOFResult {
CHECK_EOF_RESULT_SUCCESS,
CHECK_EOF_RESULT_READ_FAILURE,
CHECK_EOF_RESULT_MAGIC_NUMBER_MISMATCH,
CHECK_EOF_RESULT_CRC_MISMATCH,
CHECK_EOF_RESULT_MAX,
};
// Used in histograms, please only add entries at the end.
enum CloseResult {
CLOSE_RESULT_SUCCESS,
CLOSE_RESULT_WRITE_FAILURE,
};
void RecordSyncOpenResult(net::CacheType cache_type,
OpenEntryResult result,
bool had_index) {
DCHECK_LT(result, OPEN_ENTRY_MAX);
SIMPLE_CACHE_UMA(ENUMERATION,
"SyncOpenResult", cache_type, result, OPEN_ENTRY_MAX);
if (had_index) {
SIMPLE_CACHE_UMA(ENUMERATION,
"SyncOpenResult_WithIndex", cache_type,
result, OPEN_ENTRY_MAX);
} else {
SIMPLE_CACHE_UMA(ENUMERATION,
"SyncOpenResult_WithoutIndex", cache_type,
result, OPEN_ENTRY_MAX);
}
}
void RecordWriteResult(net::CacheType cache_type, WriteResult result) {
SIMPLE_CACHE_UMA(ENUMERATION,
"SyncWriteResult", cache_type, result, WRITE_RESULT_MAX);
}
void RecordCheckEOFResult(net::CacheType cache_type, CheckEOFResult result) {
SIMPLE_CACHE_UMA(ENUMERATION,
"SyncCheckEOFResult", cache_type,
result, CHECK_EOF_RESULT_MAX);
}
void RecordCloseResult(net::CacheType cache_type, CloseResult result) {
SIMPLE_CACHE_UMA(ENUMERATION,
"SyncCloseResult", cache_type, result, WRITE_RESULT_MAX);
}
bool CanOmitEmptyFile(int file_index) {
DCHECK_GE(file_index, 0);
DCHECK_LT(file_index, disk_cache::kSimpleEntryFileCount);
return file_index == disk_cache::simple_util::GetFileIndexFromStreamIndex(2);
}
} // namespace
namespace disk_cache {
using simple_util::GetEntryHashKey;
using simple_util::GetFilenameFromEntryHashAndFileIndex;
using simple_util::GetSparseFilenameFromEntryHash;
using simple_util::GetDataSizeFromKeyAndFileSize;
using simple_util::GetFileSizeFromKeyAndDataSize;
using simple_util::GetFileIndexFromStreamIndex;
SimpleEntryStat::SimpleEntryStat(base::Time last_used,
base::Time last_modified,
const int32 data_size[],
const int32 sparse_data_size)
: last_used_(last_used),
last_modified_(last_modified),
sparse_data_size_(sparse_data_size) {
memcpy(data_size_, data_size, sizeof(data_size_));
}
int SimpleEntryStat::GetOffsetInFile(const std::string& key,
int offset,
int stream_index) const {
const size_t headers_size = sizeof(SimpleFileHeader) + key.size();
const size_t additional_offset =
stream_index == 0 ? data_size_[1] + sizeof(SimpleFileEOF) : 0;
return headers_size + offset + additional_offset;
}
int SimpleEntryStat::GetEOFOffsetInFile(const std::string& key,
int stream_index) const {
return GetOffsetInFile(key, data_size_[stream_index], stream_index);
}
int SimpleEntryStat::GetLastEOFOffsetInFile(const std::string& key,
int stream_index) const {
const int file_index = GetFileIndexFromStreamIndex(stream_index);
const int eof_data_offset =
file_index == 0 ? data_size_[0] + data_size_[1] + sizeof(SimpleFileEOF)
: data_size_[2];
return GetOffsetInFile(key, eof_data_offset, stream_index);
}
int64 SimpleEntryStat::GetFileSize(const std::string& key,
int file_index) const {
const int32 total_data_size =
file_index == 0 ? data_size_[0] + data_size_[1] + sizeof(SimpleFileEOF)
: data_size_[2];
return GetFileSizeFromKeyAndDataSize(key, total_data_size);
}
SimpleEntryCreationResults::SimpleEntryCreationResults(
SimpleEntryStat entry_stat)
: sync_entry(NULL),
entry_stat(entry_stat),
stream_0_crc32(crc32(0, Z_NULL, 0)),
result(net::OK) {
}
SimpleEntryCreationResults::~SimpleEntryCreationResults() {
}
SimpleSynchronousEntry::CRCRecord::CRCRecord() : index(-1),
has_crc32(false),
data_crc32(0) {
}
SimpleSynchronousEntry::CRCRecord::CRCRecord(int index_p,
bool has_crc32_p,
uint32 data_crc32_p)
: index(index_p),
has_crc32(has_crc32_p),
data_crc32(data_crc32_p) {}
SimpleSynchronousEntry::EntryOperationData::EntryOperationData(int index_p,
int offset_p,
int buf_len_p)
: index(index_p),
offset(offset_p),
buf_len(buf_len_p) {}
SimpleSynchronousEntry::EntryOperationData::EntryOperationData(int index_p,
int offset_p,
int buf_len_p,
bool truncate_p,
bool doomed_p)
: index(index_p),
offset(offset_p),
buf_len(buf_len_p),
truncate(truncate_p),
doomed(doomed_p) {}
SimpleSynchronousEntry::EntryOperationData::EntryOperationData(
int64 sparse_offset_p,
int buf_len_p)
: sparse_offset(sparse_offset_p),
buf_len(buf_len_p) {}
// static
void SimpleSynchronousEntry::OpenEntry(
net::CacheType cache_type,
const FilePath& path,
const uint64 entry_hash,
bool had_index,
SimpleEntryCreationResults *out_results) {
SimpleSynchronousEntry* sync_entry =
new SimpleSynchronousEntry(cache_type, path, "", entry_hash);
out_results->result =
sync_entry->InitializeForOpen(had_index,
&out_results->entry_stat,
&out_results->stream_0_data,
&out_results->stream_0_crc32);
if (out_results->result != net::OK) {
sync_entry->Doom();
delete sync_entry;
out_results->sync_entry = NULL;
out_results->stream_0_data = NULL;
return;
}
out_results->sync_entry = sync_entry;
}
// static
void SimpleSynchronousEntry::CreateEntry(
net::CacheType cache_type,
const FilePath& path,
const std::string& key,
const uint64 entry_hash,
bool had_index,
SimpleEntryCreationResults *out_results) {
DCHECK_EQ(entry_hash, GetEntryHashKey(key));
SimpleSynchronousEntry* sync_entry =
new SimpleSynchronousEntry(cache_type, path, key, entry_hash);
out_results->result = sync_entry->InitializeForCreate(
had_index, &out_results->entry_stat);
if (out_results->result != net::OK) {
if (out_results->result != net::ERR_FILE_EXISTS)
sync_entry->Doom();
delete sync_entry;
out_results->sync_entry = NULL;
return;
}
out_results->sync_entry = sync_entry;
}
// static
int SimpleSynchronousEntry::DoomEntry(
const FilePath& path,
uint64 entry_hash) {
const bool deleted_well = DeleteFilesForEntryHash(path, entry_hash);
return deleted_well ? net::OK : net::ERR_FAILED;
}
// static
int SimpleSynchronousEntry::DoomEntrySet(
const std::vector<uint64>* key_hashes,
const FilePath& path) {
const size_t did_delete_count = std::count_if(
key_hashes->begin(), key_hashes->end(), std::bind1st(
std::ptr_fun(SimpleSynchronousEntry::DeleteFilesForEntryHash), path));
return (did_delete_count == key_hashes->size()) ? net::OK : net::ERR_FAILED;
}
void SimpleSynchronousEntry::ReadData(const EntryOperationData& in_entry_op,
net::IOBuffer* out_buf,
uint32* out_crc32,
SimpleEntryStat* entry_stat,
int* out_result) const {
DCHECK(initialized_);
DCHECK_NE(0, in_entry_op.index);
const int64 file_offset =
entry_stat->GetOffsetInFile(key_, in_entry_op.offset, in_entry_op.index);
int file_index = GetFileIndexFromStreamIndex(in_entry_op.index);
// Zero-length reads and reads to the empty streams of omitted files should
// be handled in the SimpleEntryImpl.
DCHECK_GT(in_entry_op.buf_len, 0);
DCHECK(!empty_file_omitted_[file_index]);
File* file = const_cast<File*>(&files_[file_index]);
int bytes_read =
file->Read(file_offset, out_buf->data(), in_entry_op.buf_len);
if (bytes_read > 0) {
entry_stat->set_last_used(Time::Now());
*out_crc32 = crc32(crc32(0L, Z_NULL, 0),
reinterpret_cast<const Bytef*>(out_buf->data()),
bytes_read);
}
if (bytes_read >= 0) {
*out_result = bytes_read;
} else {
*out_result = net::ERR_CACHE_READ_FAILURE;
Doom();
}
}
void SimpleSynchronousEntry::WriteData(const EntryOperationData& in_entry_op,
net::IOBuffer* in_buf,
SimpleEntryStat* out_entry_stat,
int* out_result) {
DCHECK(initialized_);
DCHECK_NE(0, in_entry_op.index);
int index = in_entry_op.index;
int file_index = GetFileIndexFromStreamIndex(index);
int offset = in_entry_op.offset;
int buf_len = in_entry_op.buf_len;
bool truncate = in_entry_op.truncate;
bool doomed = in_entry_op.doomed;
const int64 file_offset = out_entry_stat->GetOffsetInFile(
key_, in_entry_op.offset, in_entry_op.index);
bool extending_by_write = offset + buf_len > out_entry_stat->data_size(index);
if (empty_file_omitted_[file_index]) {
// Don't create a new file if the entry has been doomed, to avoid it being
// mixed up with a newly-created entry with the same key.
if (doomed) {
DLOG(WARNING) << "Rejecting write to lazily omitted stream "
<< in_entry_op.index << " of doomed cache entry.";
RecordWriteResult(cache_type_, WRITE_RESULT_LAZY_STREAM_ENTRY_DOOMED);
*out_result = net::ERR_CACHE_WRITE_FAILURE;
return;
}
File::Error error;
if (!MaybeCreateFile(file_index, FILE_REQUIRED, &error)) {
RecordWriteResult(cache_type_, WRITE_RESULT_LAZY_CREATE_FAILURE);
Doom();
*out_result = net::ERR_CACHE_WRITE_FAILURE;
return;
}
CreateEntryResult result;
if (!InitializeCreatedFile(file_index, &result)) {
RecordWriteResult(cache_type_, WRITE_RESULT_LAZY_INITIALIZE_FAILURE);
Doom();
*out_result = net::ERR_CACHE_WRITE_FAILURE;
return;
}
}
DCHECK(!empty_file_omitted_[file_index]);
if (extending_by_write) {
// The EOF record and the eventual stream afterward need to be zeroed out.
const int64 file_eof_offset =
out_entry_stat->GetEOFOffsetInFile(key_, index);
if (!files_[file_index].SetLength(file_eof_offset)) {
RecordWriteResult(cache_type_, WRITE_RESULT_PRETRUNCATE_FAILURE);
Doom();
*out_result = net::ERR_CACHE_WRITE_FAILURE;
return;
}
}
if (buf_len > 0) {
if (files_[file_index].Write(file_offset, in_buf->data(), buf_len) !=
buf_len) {
RecordWriteResult(cache_type_, WRITE_RESULT_WRITE_FAILURE);
Doom();
*out_result = net::ERR_CACHE_WRITE_FAILURE;
return;
}
}
if (!truncate && (buf_len > 0 || !extending_by_write)) {
out_entry_stat->set_data_size(
index, std::max(out_entry_stat->data_size(index), offset + buf_len));
} else {
out_entry_stat->set_data_size(index, offset + buf_len);
int file_eof_offset = out_entry_stat->GetLastEOFOffsetInFile(key_, index);
if (!files_[file_index].SetLength(file_eof_offset)) {
RecordWriteResult(cache_type_, WRITE_RESULT_TRUNCATE_FAILURE);
Doom();
*out_result = net::ERR_CACHE_WRITE_FAILURE;
return;
}
}
RecordWriteResult(cache_type_, WRITE_RESULT_SUCCESS);
base::Time modification_time = Time::Now();
out_entry_stat->set_last_used(modification_time);
out_entry_stat->set_last_modified(modification_time);
*out_result = buf_len;
}
void SimpleSynchronousEntry::ReadSparseData(
const EntryOperationData& in_entry_op,
net::IOBuffer* out_buf,
base::Time* out_last_used,
int* out_result) {
DCHECK(initialized_);
int64 offset = in_entry_op.sparse_offset;
int buf_len = in_entry_op.buf_len;
char* buf = out_buf->data();
int read_so_far = 0;
// Find the first sparse range at or after the requested offset.
SparseRangeIterator it = sparse_ranges_.lower_bound(offset);
if (it != sparse_ranges_.begin()) {
// Hop back one range and read the one overlapping with the start.
--it;
SparseRange* found_range = &it->second;
DCHECK_EQ(it->first, found_range->offset);
if (found_range->offset + found_range->length > offset) {
DCHECK_GE(found_range->length, 0);
DCHECK_LE(found_range->length, kint32max);
DCHECK_GE(offset - found_range->offset, 0);
DCHECK_LE(offset - found_range->offset, kint32max);
int net_offset = static_cast<int>(offset - found_range->offset);
int range_len_after_offset =
static_cast<int>(found_range->length - net_offset);
DCHECK_GE(range_len_after_offset, 0);
int len_to_read = std::min(buf_len, range_len_after_offset);
if (!ReadSparseRange(found_range, net_offset, len_to_read, buf)) {
*out_result = net::ERR_CACHE_READ_FAILURE;
return;
}
read_so_far += len_to_read;
}
++it;
}
// Keep reading until the buffer is full or there is not another contiguous
// range.
while (read_so_far < buf_len &&
it != sparse_ranges_.end() &&
it->second.offset == offset + read_so_far) {
SparseRange* found_range = &it->second;
DCHECK_EQ(it->first, found_range->offset);
int range_len = base::saturated_cast<int>(found_range->length);
int len_to_read = std::min(buf_len - read_so_far, range_len);
if (!ReadSparseRange(found_range, 0, len_to_read, buf + read_so_far)) {
*out_result = net::ERR_CACHE_READ_FAILURE;
return;
}
read_so_far += len_to_read;
++it;
}
*out_result = read_so_far;
}
void SimpleSynchronousEntry::WriteSparseData(
const EntryOperationData& in_entry_op,
net::IOBuffer* in_buf,
uint64 max_sparse_data_size,
SimpleEntryStat* out_entry_stat,
int* out_result) {
DCHECK(initialized_);
int64 offset = in_entry_op.sparse_offset;
int buf_len = in_entry_op.buf_len;
const char* buf = in_buf->data();
int written_so_far = 0;
int appended_so_far = 0;
if (!sparse_file_open() && !CreateSparseFile()) {
*out_result = net::ERR_CACHE_WRITE_FAILURE;
return;
}
uint64 sparse_data_size = out_entry_stat->sparse_data_size();
// This is a pessimistic estimate; it assumes the entire buffer is going to
// be appended as a new range, not written over existing ranges.
if (sparse_data_size + buf_len > max_sparse_data_size) {
DVLOG(1) << "Truncating sparse data file (" << sparse_data_size << " + "
<< buf_len << " > " << max_sparse_data_size << ")";
TruncateSparseFile();
}
SparseRangeIterator it = sparse_ranges_.lower_bound(offset);
if (it != sparse_ranges_.begin()) {
--it;
SparseRange* found_range = &it->second;
if (found_range->offset + found_range->length > offset) {
DCHECK_GE(found_range->length, 0);
DCHECK_LE(found_range->length, kint32max);
DCHECK_GE(offset - found_range->offset, 0);
DCHECK_LE(offset - found_range->offset, kint32max);
int net_offset = static_cast<int>(offset - found_range->offset);
int range_len_after_offset =
static_cast<int>(found_range->length - net_offset);
DCHECK_GE(range_len_after_offset, 0);
int len_to_write = std::min(buf_len, range_len_after_offset);
if (!WriteSparseRange(found_range, net_offset, len_to_write, buf)) {
*out_result = net::ERR_CACHE_WRITE_FAILURE;
return;
}
written_so_far += len_to_write;
}
++it;
}
while (written_so_far < buf_len &&
it != sparse_ranges_.end() &&
it->second.offset < offset + buf_len) {
SparseRange* found_range = &it->second;
if (offset + written_so_far < found_range->offset) {
int len_to_append =
static_cast<int>(found_range->offset - (offset + written_so_far));
if (!AppendSparseRange(offset + written_so_far,
len_to_append,
buf + written_so_far)) {
*out_result = net::ERR_CACHE_WRITE_FAILURE;
return;
}
written_so_far += len_to_append;
appended_so_far += len_to_append;
}
int range_len = base::saturated_cast<int>(found_range->length);
int len_to_write = std::min(buf_len - written_so_far, range_len);
if (!WriteSparseRange(found_range,
0,
len_to_write,
buf + written_so_far)) {
*out_result = net::ERR_CACHE_WRITE_FAILURE;
return;
}
written_so_far += len_to_write;
++it;
}
if (written_so_far < buf_len) {
int len_to_append = buf_len - written_so_far;
if (!AppendSparseRange(offset + written_so_far,
len_to_append,
buf + written_so_far)) {
*out_result = net::ERR_CACHE_WRITE_FAILURE;
return;
}
written_so_far += len_to_append;
appended_so_far += len_to_append;
}
DCHECK_EQ(buf_len, written_so_far);
base::Time modification_time = Time::Now();
out_entry_stat->set_last_used(modification_time);
out_entry_stat->set_last_modified(modification_time);
int32 old_sparse_data_size = out_entry_stat->sparse_data_size();
out_entry_stat->set_sparse_data_size(old_sparse_data_size + appended_so_far);
*out_result = written_so_far;
}
void SimpleSynchronousEntry::GetAvailableRange(
const EntryOperationData& in_entry_op,
int64* out_start,
int* out_result) {
DCHECK(initialized_);
int64 offset = in_entry_op.sparse_offset;
int len = in_entry_op.buf_len;
SparseRangeIterator it = sparse_ranges_.lower_bound(offset);
int64 start = offset;
int64 avail_so_far = 0;
if (it != sparse_ranges_.end() && it->second.offset < offset + len)
start = it->second.offset;
if ((it == sparse_ranges_.end() || it->second.offset > offset) &&
it != sparse_ranges_.begin()) {
--it;
if (it->second.offset + it->second.length > offset) {
start = offset;
avail_so_far = (it->second.offset + it->second.length) - offset;
}
++it;
}
while (start + avail_so_far < offset + len &&
it != sparse_ranges_.end() &&
it->second.offset == start + avail_so_far) {
avail_so_far += it->second.length;
++it;
}
int64 len_from_start = len - (start - offset);
*out_start = start;
*out_result = static_cast<int>(std::min(avail_so_far, len_from_start));
}
void SimpleSynchronousEntry::CheckEOFRecord(int index,
const SimpleEntryStat& entry_stat,
uint32 expected_crc32,
int* out_result) const {
DCHECK(initialized_);
uint32 crc32;
bool has_crc32;
int stream_size;
*out_result =
GetEOFRecordData(index, entry_stat, &has_crc32, &crc32, &stream_size);
if (*out_result != net::OK) {
Doom();
return;
}
if (has_crc32 && crc32 != expected_crc32) {
DVLOG(1) << "EOF record had bad crc.";
*out_result = net::ERR_CACHE_CHECKSUM_MISMATCH;
RecordCheckEOFResult(cache_type_, CHECK_EOF_RESULT_CRC_MISMATCH);
Doom();
return;
}
RecordCheckEOFResult(cache_type_, CHECK_EOF_RESULT_SUCCESS);
}
void SimpleSynchronousEntry::Close(
const SimpleEntryStat& entry_stat,
scoped_ptr<std::vector<CRCRecord> > crc32s_to_write,
net::GrowableIOBuffer* stream_0_data) {
DCHECK(stream_0_data);
// Write stream 0 data.
int stream_0_offset = entry_stat.GetOffsetInFile(key_, 0, 0);
if (files_[0].Write(stream_0_offset, stream_0_data->data(),
entry_stat.data_size(0)) !=
entry_stat.data_size(0)) {
RecordCloseResult(cache_type_, CLOSE_RESULT_WRITE_FAILURE);
DVLOG(1) << "Could not write stream 0 data.";
Doom();
}
for (std::vector<CRCRecord>::const_iterator it = crc32s_to_write->begin();
it != crc32s_to_write->end(); ++it) {
const int stream_index = it->index;
const int file_index = GetFileIndexFromStreamIndex(stream_index);
if (empty_file_omitted_[file_index])
continue;
SimpleFileEOF eof_record;
eof_record.stream_size = entry_stat.data_size(stream_index);
eof_record.final_magic_number = kSimpleFinalMagicNumber;
eof_record.flags = 0;
if (it->has_crc32)
eof_record.flags |= SimpleFileEOF::FLAG_HAS_CRC32;
eof_record.data_crc32 = it->data_crc32;
int eof_offset = entry_stat.GetEOFOffsetInFile(key_, stream_index);
// If stream 0 changed size, the file needs to be resized, otherwise the
// next open will yield wrong stream sizes. On stream 1 and stream 2 proper
// resizing of the file is handled in SimpleSynchronousEntry::WriteData().
if (stream_index == 0 &&
!files_[file_index].SetLength(eof_offset)) {
RecordCloseResult(cache_type_, CLOSE_RESULT_WRITE_FAILURE);
DVLOG(1) << "Could not truncate stream 0 file.";
Doom();
break;
}
if (files_[file_index].Write(eof_offset,
reinterpret_cast<const char*>(&eof_record),
sizeof(eof_record)) !=
sizeof(eof_record)) {
RecordCloseResult(cache_type_, CLOSE_RESULT_WRITE_FAILURE);
DVLOG(1) << "Could not write eof record.";
Doom();
break;
}
}
for (int i = 0; i < kSimpleEntryFileCount; ++i) {
if (empty_file_omitted_[i])
continue;
files_[i].Close();
const int64 file_size = entry_stat.GetFileSize(key_, i);
SIMPLE_CACHE_UMA(CUSTOM_COUNTS,
"LastClusterSize", cache_type_,
file_size % 4096, 0, 4097, 50);
const int64 cluster_loss = file_size % 4096 ? 4096 - file_size % 4096 : 0;
SIMPLE_CACHE_UMA(PERCENTAGE,
"LastClusterLossPercent", cache_type_,
static_cast<base::HistogramBase::Sample>(
cluster_loss * 100 / (cluster_loss + file_size)));
}
if (sparse_file_open())
sparse_file_.Close();
if (files_created_) {
const int stream2_file_index = GetFileIndexFromStreamIndex(2);
SIMPLE_CACHE_UMA(BOOLEAN, "EntryCreatedAndStream2Omitted", cache_type_,
empty_file_omitted_[stream2_file_index]);
}
RecordCloseResult(cache_type_, CLOSE_RESULT_SUCCESS);
have_open_files_ = false;
delete this;
}
SimpleSynchronousEntry::SimpleSynchronousEntry(net::CacheType cache_type,
const FilePath& path,
const std::string& key,
const uint64 entry_hash)
: cache_type_(cache_type),
path_(path),
entry_hash_(entry_hash),
key_(key),
have_open_files_(false),
initialized_(false) {
for (int i = 0; i < kSimpleEntryFileCount; ++i)
empty_file_omitted_[i] = false;
}
SimpleSynchronousEntry::~SimpleSynchronousEntry() {
DCHECK(!(have_open_files_ && initialized_));
if (have_open_files_)
CloseFiles();
}
bool SimpleSynchronousEntry::MaybeOpenFile(
int file_index,
File::Error* out_error) {
DCHECK(out_error);
FilePath filename = GetFilenameFromFileIndex(file_index);
int flags = File::FLAG_OPEN | File::FLAG_READ | File::FLAG_WRITE |
File::FLAG_SHARE_DELETE;
files_[file_index].Initialize(filename, flags);
*out_error = files_[file_index].error_details();
if (CanOmitEmptyFile(file_index) && !files_[file_index].IsValid() &&
*out_error == File::FILE_ERROR_NOT_FOUND) {
empty_file_omitted_[file_index] = true;
return true;
}
return files_[file_index].IsValid();
}
bool SimpleSynchronousEntry::MaybeCreateFile(
int file_index,
FileRequired file_required,
File::Error* out_error) {
DCHECK(out_error);
if (CanOmitEmptyFile(file_index) && file_required == FILE_NOT_REQUIRED) {
empty_file_omitted_[file_index] = true;
return true;
}
FilePath filename = GetFilenameFromFileIndex(file_index);
int flags = File::FLAG_CREATE | File::FLAG_READ | File::FLAG_WRITE |
File::FLAG_SHARE_DELETE;
files_[file_index].Initialize(filename, flags);
*out_error = files_[file_index].error_details();
empty_file_omitted_[file_index] = false;
return files_[file_index].IsValid();
}
bool SimpleSynchronousEntry::OpenFiles(
bool had_index,
SimpleEntryStat* out_entry_stat) {
for (int i = 0; i < kSimpleEntryFileCount; ++i) {
File::Error error;
if (!MaybeOpenFile(i, &error)) {
// TODO(ttuttle,gavinp): Remove one each of these triplets of histograms.
// We can calculate the third as the sum or difference of the other two.
RecordSyncOpenResult(
cache_type_, OPEN_ENTRY_PLATFORM_FILE_ERROR, had_index);
SIMPLE_CACHE_UMA(ENUMERATION,
"SyncOpenPlatformFileError", cache_type_,
-error, -base::File::FILE_ERROR_MAX);
if (had_index) {
SIMPLE_CACHE_UMA(ENUMERATION,
"SyncOpenPlatformFileError_WithIndex", cache_type_,
-error, -base::File::FILE_ERROR_MAX);
} else {
SIMPLE_CACHE_UMA(ENUMERATION,
"SyncOpenPlatformFileError_WithoutIndex",
cache_type_,
-error, -base::File::FILE_ERROR_MAX);
}
while (--i >= 0)
CloseFile(i);
return false;
}
}
have_open_files_ = true;
base::TimeDelta entry_age = base::Time::Now() - base::Time::UnixEpoch();
for (int i = 0; i < kSimpleEntryFileCount; ++i) {
if (empty_file_omitted_[i]) {
out_entry_stat->set_data_size(i + 1, 0);
continue;
}
File::Info file_info;
bool success = files_[i].GetInfo(&file_info);
base::Time file_last_modified;
if (!success) {
DLOG(WARNING) << "Could not get platform file info.";
continue;
}
out_entry_stat->set_last_used(file_info.last_accessed);
if (simple_util::GetMTime(path_, &file_last_modified))
out_entry_stat->set_last_modified(file_last_modified);
else
out_entry_stat->set_last_modified(file_info.last_modified);
base::TimeDelta stream_age =
base::Time::Now() - out_entry_stat->last_modified();
if (stream_age < entry_age)
entry_age = stream_age;
// Two things prevent from knowing the right values for |data_size|:
// 1) The key is not known, hence its length is unknown.
// 2) Stream 0 and stream 1 are in the same file, and the exact size for
// each will only be known when reading the EOF record for stream 0.
//
// The size for file 0 and 1 is temporarily kept in
// |data_size(1)| and |data_size(2)| respectively. Reading the key in
// InitializeForOpen yields the data size for each file. In the case of
// file hash_1, this is the total size of stream 2, and is assigned to
// data_size(2). In the case of file 0, it is the combined size of stream
// 0, stream 1 and one EOF record. The exact distribution of sizes between
// stream 1 and stream 0 is only determined after reading the EOF record
// for stream 0 in ReadAndValidateStream0.
out_entry_stat->set_data_size(i + 1, static_cast<int>(file_info.size));
}
SIMPLE_CACHE_UMA(CUSTOM_COUNTS,
"SyncOpenEntryAge", cache_type_,
entry_age.InHours(), 1, 1000, 50);
files_created_ = false;
return true;
}
bool SimpleSynchronousEntry::CreateFiles(
bool had_index,
SimpleEntryStat* out_entry_stat) {
for (int i = 0; i < kSimpleEntryFileCount; ++i) {
File::Error error;
if (!MaybeCreateFile(i, FILE_NOT_REQUIRED, &error)) {
// TODO(ttuttle,gavinp): Remove one each of these triplets of histograms.
// We can calculate the third as the sum or difference of the other two.
RecordSyncCreateResult(CREATE_ENTRY_PLATFORM_FILE_ERROR, had_index);
SIMPLE_CACHE_UMA(ENUMERATION,
"SyncCreatePlatformFileError", cache_type_,
-error, -base::File::FILE_ERROR_MAX);
if (had_index) {
SIMPLE_CACHE_UMA(ENUMERATION,
"SyncCreatePlatformFileError_WithIndex", cache_type_,
-error, -base::File::FILE_ERROR_MAX);
} else {
SIMPLE_CACHE_UMA(ENUMERATION,
"SyncCreatePlatformFileError_WithoutIndex",
cache_type_,
-error, -base::File::FILE_ERROR_MAX);
}
while (--i >= 0)
CloseFile(i);
return false;
}
}
have_open_files_ = true;
base::Time creation_time = Time::Now();
out_entry_stat->set_last_modified(creation_time);
out_entry_stat->set_last_used(creation_time);
for (int i = 0; i < kSimpleEntryStreamCount; ++i)
out_entry_stat->set_data_size(i, 0);
files_created_ = true;
return true;
}
void SimpleSynchronousEntry::CloseFile(int index) {
if (empty_file_omitted_[index]) {
empty_file_omitted_[index] = false;
} else {
DCHECK(files_[index].IsValid());
files_[index].Close();
}
if (sparse_file_open())
CloseSparseFile();
}
void SimpleSynchronousEntry::CloseFiles() {
for (int i = 0; i < kSimpleEntryFileCount; ++i)
CloseFile(i);
}
int SimpleSynchronousEntry::InitializeForOpen(
bool had_index,
SimpleEntryStat* out_entry_stat,
scoped_refptr<net::GrowableIOBuffer>* stream_0_data,
uint32* out_stream_0_crc32) {
DCHECK(!initialized_);
if (!OpenFiles(had_index, out_entry_stat)) {
DLOG(WARNING) << "Could not open platform files for entry.";
return net::ERR_FAILED;
}
for (int i = 0; i < kSimpleEntryFileCount; ++i) {
if (empty_file_omitted_[i])
continue;
SimpleFileHeader header;
int header_read_result =
files_[i].Read(0, reinterpret_cast<char*>(&header), sizeof(header));
if (header_read_result != sizeof(header)) {
DLOG(WARNING) << "Cannot read header from entry.";
RecordSyncOpenResult(cache_type_, OPEN_ENTRY_CANT_READ_HEADER, had_index);
return net::ERR_FAILED;
}
if (header.initial_magic_number != kSimpleInitialMagicNumber) {
// TODO(gavinp): This seems very bad; for now we log at WARNING, but we
// should give consideration to not saturating the log with these if that
// becomes a problem.
DLOG(WARNING) << "Magic number did not match.";
RecordSyncOpenResult(cache_type_, OPEN_ENTRY_BAD_MAGIC_NUMBER, had_index);
return net::ERR_FAILED;
}
if (header.version != kSimpleEntryVersionOnDisk) {
DLOG(WARNING) << "Unreadable version.";
RecordSyncOpenResult(cache_type_, OPEN_ENTRY_BAD_VERSION, had_index);
return net::ERR_FAILED;
}
scoped_ptr<char[]> key(new char[header.key_length]);
int key_read_result = files_[i].Read(sizeof(header), key.get(),
header.key_length);
if (key_read_result != implicit_cast<int>(header.key_length)) {
DLOG(WARNING) << "Cannot read key from entry.";
RecordSyncOpenResult(cache_type_, OPEN_ENTRY_CANT_READ_KEY, had_index);
return net::ERR_FAILED;
}
key_ = std::string(key.get(), header.key_length);
if (i == 0) {
// File size for stream 0 has been stored temporarily in data_size[1].
int total_data_size =
GetDataSizeFromKeyAndFileSize(key_, out_entry_stat->data_size(1));
int ret_value_stream_0 = ReadAndValidateStream0(
total_data_size, out_entry_stat, stream_0_data, out_stream_0_crc32);
if (ret_value_stream_0 != net::OK)
return ret_value_stream_0;
} else {
out_entry_stat->set_data_size(
2, GetDataSizeFromKeyAndFileSize(key_, out_entry_stat->data_size(2)));
if (out_entry_stat->data_size(2) < 0) {
DLOG(WARNING) << "Stream 2 file is too small.";
return net::ERR_FAILED;
}
}
if (base::Hash(key.get(), header.key_length) != header.key_hash) {
DLOG(WARNING) << "Hash mismatch on key.";
RecordSyncOpenResult(
cache_type_, OPEN_ENTRY_KEY_HASH_MISMATCH, had_index);
return net::ERR_FAILED;
}
}
int32 sparse_data_size = 0;
if (!OpenSparseFileIfExists(&sparse_data_size)) {
RecordSyncOpenResult(
cache_type_, OPEN_ENTRY_SPARSE_OPEN_FAILED, had_index);
return net::ERR_FAILED;
}
out_entry_stat->set_sparse_data_size(sparse_data_size);
bool removed_stream2 = false;
const int stream2_file_index = GetFileIndexFromStreamIndex(2);
DCHECK(CanOmitEmptyFile(stream2_file_index));
if (!empty_file_omitted_[stream2_file_index] &&
out_entry_stat->data_size(2) == 0) {
DVLOG(1) << "Removing empty stream 2 file.";
CloseFile(stream2_file_index);
DeleteFileForEntryHash(path_, entry_hash_, stream2_file_index);
empty_file_omitted_[stream2_file_index] = true;
removed_stream2 = true;
}
SIMPLE_CACHE_UMA(BOOLEAN, "EntryOpenedAndStream2Removed", cache_type_,
removed_stream2);
RecordSyncOpenResult(cache_type_, OPEN_ENTRY_SUCCESS, had_index);
initialized_ = true;
return net::OK;
}
bool SimpleSynchronousEntry::InitializeCreatedFile(
int file_index,
CreateEntryResult* out_result) {
SimpleFileHeader header;
header.initial_magic_number = kSimpleInitialMagicNumber;
header.version = kSimpleEntryVersionOnDisk;
header.key_length = key_.size();
header.key_hash = base::Hash(key_);
int bytes_written = files_[file_index].Write(
0, reinterpret_cast<char*>(&header), sizeof(header));
if (bytes_written != sizeof(header)) {
*out_result = CREATE_ENTRY_CANT_WRITE_HEADER;
return false;
}
bytes_written = files_[file_index].Write(sizeof(header), key_.data(),
key_.size());
if (bytes_written != implicit_cast<int>(key_.size())) {
*out_result = CREATE_ENTRY_CANT_WRITE_KEY;
return false;
}
return true;
}
int SimpleSynchronousEntry::InitializeForCreate(
bool had_index,
SimpleEntryStat* out_entry_stat) {
DCHECK(!initialized_);
if (!CreateFiles(had_index, out_entry_stat)) {
DLOG(WARNING) << "Could not create platform files.";
return net::ERR_FILE_EXISTS;
}
for (int i = 0; i < kSimpleEntryFileCount; ++i) {
if (empty_file_omitted_[i])
continue;
CreateEntryResult result;
if (!InitializeCreatedFile(i, &result)) {
RecordSyncCreateResult(result, had_index);
return net::ERR_FAILED;
}
}
RecordSyncCreateResult(CREATE_ENTRY_SUCCESS, had_index);
initialized_ = true;
return net::OK;
}
int SimpleSynchronousEntry::ReadAndValidateStream0(
int total_data_size,
SimpleEntryStat* out_entry_stat,
scoped_refptr<net::GrowableIOBuffer>* stream_0_data,
uint32* out_stream_0_crc32) const {
// Temporarily assign all the data size to stream 1 in order to read the
// EOF record for stream 0, which contains the size of stream 0.
out_entry_stat->set_data_size(0, 0);
out_entry_stat->set_data_size(1, total_data_size - sizeof(SimpleFileEOF));
bool has_crc32;
uint32 read_crc32;
int stream_0_size;
int ret_value_crc32 = GetEOFRecordData(
0, *out_entry_stat, &has_crc32, &read_crc32, &stream_0_size);
if (ret_value_crc32 != net::OK)
return ret_value_crc32;
if (stream_0_size > out_entry_stat->data_size(1))
return net::ERR_FAILED;
// These are the real values of data size.
out_entry_stat->set_data_size(0, stream_0_size);
out_entry_stat->set_data_size(
1, out_entry_stat->data_size(1) - stream_0_size);
// Put stream 0 data in memory.
*stream_0_data = new net::GrowableIOBuffer();
(*stream_0_data)->SetCapacity(stream_0_size);
int file_offset = out_entry_stat->GetOffsetInFile(key_, 0, 0);
File* file = const_cast<File*>(&files_[0]);
int bytes_read =
file->Read(file_offset, (*stream_0_data)->data(), stream_0_size);
if (bytes_read != stream_0_size)
return net::ERR_FAILED;
// Check the CRC32.
uint32 expected_crc32 =
stream_0_size == 0
? crc32(0, Z_NULL, 0)
: crc32(crc32(0, Z_NULL, 0),
reinterpret_cast<const Bytef*>((*stream_0_data)->data()),
stream_0_size);
if (has_crc32 && read_crc32 != expected_crc32) {
DVLOG(1) << "EOF record had bad crc.";
RecordCheckEOFResult(cache_type_, CHECK_EOF_RESULT_CRC_MISMATCH);
return net::ERR_FAILED;
}
*out_stream_0_crc32 = expected_crc32;
RecordCheckEOFResult(cache_type_, CHECK_EOF_RESULT_SUCCESS);
return net::OK;
}
int SimpleSynchronousEntry::GetEOFRecordData(int index,
const SimpleEntryStat& entry_stat,
bool* out_has_crc32,
uint32* out_crc32,
int* out_data_size) const {
SimpleFileEOF eof_record;
int file_offset = entry_stat.GetEOFOffsetInFile(key_, index);
int file_index = GetFileIndexFromStreamIndex(index);
File* file = const_cast<File*>(&files_[file_index]);
if (file->Read(file_offset, reinterpret_cast<char*>(&eof_record),
sizeof(eof_record)) !=
sizeof(eof_record)) {
RecordCheckEOFResult(cache_type_, CHECK_EOF_RESULT_READ_FAILURE);
return net::ERR_CACHE_CHECKSUM_READ_FAILURE;
}
if (eof_record.final_magic_number != kSimpleFinalMagicNumber) {
RecordCheckEOFResult(cache_type_, CHECK_EOF_RESULT_MAGIC_NUMBER_MISMATCH);
DVLOG(1) << "EOF record had bad magic number.";
return net::ERR_CACHE_CHECKSUM_READ_FAILURE;
}
*out_has_crc32 = (eof_record.flags & SimpleFileEOF::FLAG_HAS_CRC32) ==
SimpleFileEOF::FLAG_HAS_CRC32;
*out_crc32 = eof_record.data_crc32;
*out_data_size = eof_record.stream_size;
SIMPLE_CACHE_UMA(BOOLEAN, "SyncCheckEOFHasCrc", cache_type_, *out_has_crc32);
return net::OK;
}
void SimpleSynchronousEntry::Doom() const {
DeleteFilesForEntryHash(path_, entry_hash_);
}
// static
bool SimpleSynchronousEntry::DeleteFileForEntryHash(
const FilePath& path,
const uint64 entry_hash,
const int file_index) {
FilePath to_delete = path.AppendASCII(
GetFilenameFromEntryHashAndFileIndex(entry_hash, file_index));
return simple_util::SimpleCacheDeleteFile(to_delete);
}
// static
bool SimpleSynchronousEntry::DeleteFilesForEntryHash(
const FilePath& path,
const uint64 entry_hash) {
bool result = true;
for (int i = 0; i < kSimpleEntryFileCount; ++i) {
if (!DeleteFileForEntryHash(path, entry_hash, i) && !CanOmitEmptyFile(i))
result = false;
}
FilePath to_delete = path.AppendASCII(
GetSparseFilenameFromEntryHash(entry_hash));
simple_util::SimpleCacheDeleteFile(to_delete);
return result;
}
void SimpleSynchronousEntry::RecordSyncCreateResult(CreateEntryResult result,
bool had_index) {
DCHECK_LT(result, CREATE_ENTRY_MAX);
SIMPLE_CACHE_UMA(ENUMERATION,
"SyncCreateResult", cache_type_, result, CREATE_ENTRY_MAX);
if (had_index) {
SIMPLE_CACHE_UMA(ENUMERATION,
"SyncCreateResult_WithIndex", cache_type_,
result, CREATE_ENTRY_MAX);
} else {
SIMPLE_CACHE_UMA(ENUMERATION,
"SyncCreateResult_WithoutIndex", cache_type_,
result, CREATE_ENTRY_MAX);
}
}
FilePath SimpleSynchronousEntry::GetFilenameFromFileIndex(int file_index) {
return path_.AppendASCII(
GetFilenameFromEntryHashAndFileIndex(entry_hash_, file_index));
}
bool SimpleSynchronousEntry::OpenSparseFileIfExists(
int32* out_sparse_data_size) {
DCHECK(!sparse_file_open());
FilePath filename = path_.AppendASCII(
GetSparseFilenameFromEntryHash(entry_hash_));
int flags = File::FLAG_OPEN | File::FLAG_READ | File::FLAG_WRITE |
File::FLAG_SHARE_DELETE;
sparse_file_.Initialize(filename, flags);
if (sparse_file_.IsValid())
return ScanSparseFile(out_sparse_data_size);
return sparse_file_.error_details() == File::FILE_ERROR_NOT_FOUND;
}
bool SimpleSynchronousEntry::CreateSparseFile() {
DCHECK(!sparse_file_open());
FilePath filename = path_.AppendASCII(
GetSparseFilenameFromEntryHash(entry_hash_));
int flags = File::FLAG_CREATE | File::FLAG_READ | File::FLAG_WRITE |
File::FLAG_SHARE_DELETE;
sparse_file_.Initialize(filename, flags);
if (!sparse_file_.IsValid())
return false;
return InitializeSparseFile();
}
void SimpleSynchronousEntry::CloseSparseFile() {
DCHECK(sparse_file_open());
sparse_file_.Close();
}
bool SimpleSynchronousEntry::TruncateSparseFile() {
DCHECK(sparse_file_open());
int64 header_and_key_length = sizeof(SimpleFileHeader) + key_.size();
if (!sparse_file_.SetLength(header_and_key_length)) {
DLOG(WARNING) << "Could not truncate sparse file";
return false;
}
sparse_ranges_.clear();
return true;
}
bool SimpleSynchronousEntry::InitializeSparseFile() {
DCHECK(sparse_file_open());
SimpleFileHeader header;
header.initial_magic_number = kSimpleInitialMagicNumber;
header.version = kSimpleVersion;
header.key_length = key_.size();
header.key_hash = base::Hash(key_);
int header_write_result =
sparse_file_.Write(0, reinterpret_cast<char*>(&header), sizeof(header));
if (header_write_result != sizeof(header)) {
DLOG(WARNING) << "Could not write sparse file header";
return false;
}
int key_write_result = sparse_file_.Write(sizeof(header), key_.data(),
key_.size());
if (key_write_result != implicit_cast<int>(key_.size())) {
DLOG(WARNING) << "Could not write sparse file key";
return false;
}
sparse_ranges_.clear();
sparse_tail_offset_ = sizeof(header) + key_.size();
return true;
}
bool SimpleSynchronousEntry::ScanSparseFile(int32* out_sparse_data_size) {
DCHECK(sparse_file_open());
int64 sparse_data_size = 0;
SimpleFileHeader header;
int header_read_result =
sparse_file_.Read(0, reinterpret_cast<char*>(&header), sizeof(header));
if (header_read_result != sizeof(header)) {
DLOG(WARNING) << "Could not read header from sparse file.";
return false;
}
if (header.initial_magic_number != kSimpleInitialMagicNumber) {
DLOG(WARNING) << "Sparse file magic number did not match.";
return false;
}
if (header.version != kSimpleVersion) {
DLOG(WARNING) << "Sparse file unreadable version.";
return false;
}
sparse_ranges_.clear();
int64 range_header_offset = sizeof(header) + key_.size();
while (1) {
SimpleFileSparseRangeHeader range_header;
int range_header_read_result =
sparse_file_.Read(range_header_offset,
reinterpret_cast<char*>(&range_header),
sizeof(range_header));
if (range_header_read_result == 0)
break;
if (range_header_read_result != sizeof(range_header)) {
DLOG(WARNING) << "Could not read sparse range header.";
return false;
}
if (range_header.sparse_range_magic_number !=
kSimpleSparseRangeMagicNumber) {
DLOG(WARNING) << "Invalid sparse range header magic number.";
return false;
}
SparseRange range;
range.offset = range_header.offset;
range.length = range_header.length;
range.data_crc32 = range_header.data_crc32;
range.file_offset = range_header_offset + sizeof(range_header);
sparse_ranges_.insert(std::make_pair(range.offset, range));
range_header_offset += sizeof(range_header) + range.length;
DCHECK_GE(sparse_data_size + range.length, sparse_data_size);
sparse_data_size += range.length;
}
*out_sparse_data_size = static_cast<int32>(sparse_data_size);
sparse_tail_offset_ = range_header_offset;
return true;
}
bool SimpleSynchronousEntry::ReadSparseRange(const SparseRange* range,
int offset, int len, char* buf) {
DCHECK(range);
DCHECK(buf);
DCHECK_LE(offset, range->length);
DCHECK_LE(offset + len, range->length);
int bytes_read = sparse_file_.Read(range->file_offset + offset, buf, len);
if (bytes_read < len) {
DLOG(WARNING) << "Could not read sparse range.";
return false;
}
// If we read the whole range and we have a crc32, check it.
if (offset == 0 && len == range->length && range->data_crc32 != 0) {
uint32 actual_crc32 = crc32(crc32(0L, Z_NULL, 0),
reinterpret_cast<const Bytef*>(buf),
len);
if (actual_crc32 != range->data_crc32) {
DLOG(WARNING) << "Sparse range crc32 mismatch.";
return false;
}
}
// TODO(ttuttle): Incremental crc32 calculation?
return true;
}
bool SimpleSynchronousEntry::WriteSparseRange(SparseRange* range,
int offset, int len,
const char* buf) {
DCHECK(range);
DCHECK(buf);
DCHECK_LE(offset, range->length);
DCHECK_LE(offset + len, range->length);
uint32 new_crc32 = 0;
if (offset == 0 && len == range->length) {
new_crc32 = crc32(crc32(0L, Z_NULL, 0),
reinterpret_cast<const Bytef*>(buf),
len);
}
if (new_crc32 != range->data_crc32) {
range->data_crc32 = new_crc32;
SimpleFileSparseRangeHeader header;
header.sparse_range_magic_number = kSimpleSparseRangeMagicNumber;
header.offset = range->offset;
header.length = range->length;
header.data_crc32 = range->data_crc32;
int bytes_written = sparse_file_.Write(range->file_offset - sizeof(header),
reinterpret_cast<char*>(&header),
sizeof(header));
if (bytes_written != implicit_cast<int>(sizeof(header))) {
DLOG(WARNING) << "Could not rewrite sparse range header.";
return false;
}
}
int bytes_written = sparse_file_.Write(range->file_offset + offset, buf, len);
if (bytes_written < len) {
DLOG(WARNING) << "Could not write sparse range.";
return false;
}
return true;
}
bool SimpleSynchronousEntry::AppendSparseRange(int64 offset,
int len,
const char* buf) {
DCHECK_GE(offset, 0);
DCHECK_GT(len, 0);
DCHECK(buf);
uint32 data_crc32 = crc32(crc32(0L, Z_NULL, 0),
reinterpret_cast<const Bytef*>(buf),
len);
SimpleFileSparseRangeHeader header;
header.sparse_range_magic_number = kSimpleSparseRangeMagicNumber;
header.offset = offset;
header.length = len;
header.data_crc32 = data_crc32;
int bytes_written = sparse_file_.Write(sparse_tail_offset_,
reinterpret_cast<char*>(&header),
sizeof(header));
if (bytes_written != implicit_cast<int>(sizeof(header))) {
DLOG(WARNING) << "Could not append sparse range header.";
return false;
}
sparse_tail_offset_ += bytes_written;
bytes_written = sparse_file_.Write(sparse_tail_offset_, buf, len);
if (bytes_written < len) {
DLOG(WARNING) << "Could not append sparse range data.";
return false;
}
int64 data_file_offset = sparse_tail_offset_;
sparse_tail_offset_ += bytes_written;
SparseRange range;
range.offset = offset;
range.length = len;
range.data_crc32 = data_crc32;
range.file_offset = data_file_offset;
sparse_ranges_.insert(std::make_pair(offset, range));
return true;
}
} // namespace disk_cache