Move data pack from base to app (it's just part of the resource bundle system...

base/data_pack.cc

Index: base/data_pack.cc
===================================================================
--- base/data_pack.cc	(revision 69977)
+++ base/data_pack.cc	(working copy)
@@ -1,216 +0,0 @@
-// 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 "base/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 base {
-
-// 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, 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, 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, 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, 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 base