| /* |
| * Copyright (C) 2014 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "core/xml/parser/SharedBufferReader.h" |
| |
| #include "platform/SharedBuffer.h" |
| #include "wtf/PassRefPtr.h" |
| #include "wtf/RefPtr.h" |
| |
| #include <algorithm> |
| #include <cstring> |
| |
| namespace WebCore { |
| |
| SharedBufferReader::SharedBufferReader(PassRefPtr<SharedBuffer> buffer) |
| : m_buffer(buffer) |
| , m_currentOffset(0) |
| { |
| } |
| |
| SharedBufferReader::~SharedBufferReader() |
| { |
| } |
| |
| int SharedBufferReader::readData(char* outputBuffer, unsigned askedToRead) |
| { |
| if (!m_buffer || m_currentOffset > m_buffer->size()) |
| return 0; |
| |
| unsigned bytesCopied = 0; |
| unsigned bytesLeft = m_buffer->size() - m_currentOffset; |
| unsigned lenToCopy = std::min(askedToRead, bytesLeft); |
| |
| while (bytesCopied < lenToCopy) { |
| const char* data; |
| unsigned segmentSize = m_buffer->getSomeData(data, m_currentOffset); |
| if (!segmentSize) |
| break; |
| |
| segmentSize = std::min(segmentSize, lenToCopy - bytesCopied); |
| memcpy(outputBuffer + bytesCopied, data, segmentSize); |
| bytesCopied += segmentSize; |
| m_currentOffset += segmentSize; |
| } |
| |
| return bytesCopied; |
| } |
| |
| } // namespace WebCore |