/* -*- 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