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