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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.
part of core;
class _MojoSharedBufferNatives {
static List Create(int numBytes, int flags)
native "MojoSharedBuffer_Create";
static List Duplicate(int bufferHandle, int flags)
native "MojoSharedBuffer_Duplicate";
static List Map(MojoSharedBuffer buffer,
int bufferHandle,
int offset,
int numBytes,
int flags)
native "MojoSharedBuffer_Map";
static int Unmap(ByteData buffer)
native "MojoSharedBuffer_Unmap";
}
class MojoSharedBuffer {
static const int CREATE_FLAG_NONE = 0;
static const int DUPLICATE_FLAG_NONE = 0;
static const int MAP_FLAG_NONE = 0;
MojoHandle handle;
MojoResult status;
ByteData mapping;
MojoSharedBuffer(
this.handle, [this.status = MojoResult.OK, this.mapping = null]);
factory MojoSharedBuffer.create(int numBytes, [int flags = 0]) {
List result = _MojoSharedBufferNatives.Create(numBytes, flags);
if (result == null) {
return null;
}
assert((result is List) && (result.length == 2));
var r = new MojoResult(result[0]);
if (!r.isOk) {
return null;
}
MojoSharedBuffer buf =
new MojoSharedBuffer(new MojoHandle(result[1]), r, null);
return buf;
}
factory MojoSharedBuffer.duplicate(MojoSharedBuffer msb, [int flags = 0]) {
List result = _MojoSharedBufferNatives.Duplicate(msb.handle.h, flags);
if (result == null) {
return null;
}
assert((result is List) && (result.length == 2));
var r = new MojoResult(result[0]);
if(!r.isOk) {
return null;
}
MojoSharedBuffer dupe =
new MojoSharedBuffer(new MojoHandle(result[1]), r, null);
return dupe;
}
MojoResult close() {
if (handle == null) {
status = MojoResult.INVALID_ARGUMENT;
return status;
}
MojoResult r = handle.close();
status = r;
mapping = null;
return status;
}
MojoResult map(int offset, int numBytes, [int flags = 0]) {
if (handle == null) {
status = MojoResult.INVALID_ARGUMENT;
return status;
}
List result = _MojoSharedBufferNatives.Map(
this, handle.h, offset, numBytes, flags);
if (result == null) {
status = MojoResult.INVALID_ARGUMENT;
return status;
}
assert((result is List) && (result.length == 2));
status = new MojoResult(result[0]);
mapping = result[1];
return status;
}
MojoResult unmap() {
int r = _MojoSharedBufferNatives.Unmap(mapping);
status = new MojoResult(r);
mapping = null;
return status;
}
}
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