blob: 46147acb5ed241de54bfd2779756e445bc7d3305 [file] [log] [blame]
// Copyright (c) 2006-2008 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/mapped_file.h"
#include <errno.h>
#include <sys/mman.h>
#include "net/disk_cache/disk_cache.h"
namespace disk_cache {
void* MappedFile::Init(const std::wstring name, size_t size) {
DCHECK(!init_);
if (init_ || !File::Init(name))
return NULL;
if (!size)
size = GetLength();
buffer_ = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED,
platform_file(), 0);
init_ = true;
DCHECK(reinterpret_cast<int>(buffer_) != -1);
if (reinterpret_cast<int>(buffer_) == -1)
buffer_ = 0;
view_size_ = size;
return buffer_;
}
MappedFile::~MappedFile() {
if (!init_)
return;
if (buffer_) {
int ret = munmap(buffer_, view_size_);
DCHECK(0 == ret);
}
}
bool MappedFile::Load(const FileBlock* block) {
size_t offset = block->offset() + view_size_;
return Read(block->buffer(), block->size(), offset);
}
bool MappedFile::Store(const FileBlock* block) {
size_t offset = block->offset() + view_size_;
return Write(block->buffer(), block->size(), offset);
}
} // namespace disk_cache