зеркало из https://github.com/mozilla/gecko-dev.git
69 строки
1.6 KiB
C++
69 строки
1.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "ResourceStream.h"
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namespace mozilla {
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ResourceStream::ResourceStream(mozilla::MediaResource* aResource)
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: mResource(aResource)
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, mPinCount(0)
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{
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MOZ_ASSERT(aResource);
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DDLINKCHILD("resource", &mResource);
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}
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ResourceStream::~ResourceStream()
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{
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MOZ_ASSERT(mPinCount == 0);
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}
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bool
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ResourceStream::ReadAt(int64_t aOffset, void* aBuffer, size_t aCount,
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size_t* aBytesRead)
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{
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uint32_t sum = 0;
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uint32_t bytesRead = 0;
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do {
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uint64_t offset = aOffset + sum;
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char* buffer = reinterpret_cast<char*>(aBuffer) + sum;
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uint32_t toRead = aCount - sum;
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nsresult rv = mResource.ReadAt(offset, buffer, toRead, &bytesRead);
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if (NS_FAILED(rv)) {
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return false;
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}
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sum += bytesRead;
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} while (sum < aCount && bytesRead > 0);
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*aBytesRead = sum;
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return true;
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}
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bool
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ResourceStream::CachedReadAt(int64_t aOffset, void* aBuffer, size_t aCount,
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size_t* aBytesRead)
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{
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nsresult rv = mResource.GetResource()->ReadFromCache(
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reinterpret_cast<char*>(aBuffer), aOffset, aCount);
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if (NS_FAILED(rv)) {
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*aBytesRead = 0;
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return false;
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}
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*aBytesRead = aCount;
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return true;
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}
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bool
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ResourceStream::Length(int64_t* aSize)
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{
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if (mResource.GetLength() < 0)
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return false;
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*aSize = mResource.GetLength();
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return true;
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}
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} // namespace mozilla
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