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// Copyright 2014 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 "mojo/embedder/simple_platform_shared_buffer.h"
#include "base/logging.h"
#include "mojo/embedder/platform_handle_utils.h"
namespace mojo {
namespace embedder {
// static
SimplePlatformSharedBuffer* SimplePlatformSharedBuffer::Create(
size_t num_bytes) {
DCHECK_GT(num_bytes, 0u);
SimplePlatformSharedBuffer* rv = new SimplePlatformSharedBuffer(num_bytes);
if (!rv->Init()) {
// We can't just delete it directly, due to the "in destructor" (debug)
// check.
scoped_refptr<SimplePlatformSharedBuffer> deleter(rv);
return NULL;
}
return rv;
}
// static
SimplePlatformSharedBuffer*
SimplePlatformSharedBuffer::CreateFromPlatformHandle(
size_t num_bytes,
ScopedPlatformHandle platform_handle) {
DCHECK_GT(num_bytes, 0u);
SimplePlatformSharedBuffer* rv = new SimplePlatformSharedBuffer(num_bytes);
if (!rv->InitFromPlatformHandle(platform_handle.Pass())) {
// We can't just delete it directly, due to the "in destructor" (debug)
// check.
scoped_refptr<SimplePlatformSharedBuffer> deleter(rv);
return NULL;
}
return rv;
}
size_t SimplePlatformSharedBuffer::GetNumBytes() const {
return num_bytes_;
}
scoped_ptr<PlatformSharedBufferMapping> SimplePlatformSharedBuffer::Map(
size_t offset,
size_t length) {
if (!IsValidMap(offset, length))
return scoped_ptr<PlatformSharedBufferMapping>();
return MapNoCheck(offset, length);
}
bool SimplePlatformSharedBuffer::IsValidMap(size_t offset, size_t length) {
if (offset > num_bytes_ || length == 0)
return false;
// Note: This is an overflow-safe check of |offset + length > num_bytes_|
// (that |num_bytes >= offset| is verified above).
if (length > num_bytes_ - offset)
return false;
return true;
}
scoped_ptr<PlatformSharedBufferMapping> SimplePlatformSharedBuffer::MapNoCheck(
size_t offset,
size_t length) {
DCHECK(IsValidMap(offset, length));
return MapImpl(offset, length);
}
ScopedPlatformHandle SimplePlatformSharedBuffer::DuplicatePlatformHandle() {
return mojo::embedder::DuplicatePlatformHandle(handle_.get());
}
ScopedPlatformHandle SimplePlatformSharedBuffer::PassPlatformHandle() {
DCHECK(HasOneRef());
return handle_.Pass();
}
SimplePlatformSharedBuffer::SimplePlatformSharedBuffer(size_t num_bytes)
: num_bytes_(num_bytes) {
}
SimplePlatformSharedBuffer::~SimplePlatformSharedBuffer() {
}
SimplePlatformSharedBufferMapping::~SimplePlatformSharedBufferMapping() {
Unmap();
}
void* SimplePlatformSharedBufferMapping::GetBase() const {
return base_;
}
size_t SimplePlatformSharedBufferMapping::GetLength() const {
return length_;
}
} // namespace embedder
} // namespace mojo
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