C++ (Cpp) setWritePosition示例

示例#1

文件： IndexBuffer.cpp 项目： venkatarajasekhar/Qt

gl::Error StreamingIndexBufferInterface::reserveBufferSpace(unsigned int size, GLenum indexType)
{
    unsigned int curBufferSize = getBufferSize();
    unsigned int writePos = getWritePosition();
    if (size > curBufferSize)
    {
        gl::Error error = setBufferSize(std::max(size, 2 * curBufferSize), indexType);
        if (error.isError())
        {
            return error;
        }
        setWritePosition(0);
    }
    else if (writePos + size > curBufferSize || writePos + size < writePos)
    {
        gl::Error error = discard();
        if (error.isError())
        {
            return error;
        }
        setWritePosition(0);
    }

    return gl::Error(GL_NO_ERROR);
}

示例#2

文件： plain-file.cpp 项目： AeroEng43/hhvm

bool PlainFile::seek(int64_t offset, int whence /* = SEEK_SET */) {
  assert(valid());

  if (whence == SEEK_CUR) {
    off_t result = lseek(getFd(), 0, SEEK_CUR);
    if (result != (off_t)-1) {
      offset += result - (bufferedLen() + getPosition());
    }
    if (offset > 0 && offset < bufferedLen()) {
      setReadPosition(getReadPosition() + offset);
      setPosition(getPosition() + offset);
      return true;
    }
    offset += getPosition();
    whence = SEEK_SET;
  }

  // invalidate the current buffer
  setWritePosition(0);
  setReadPosition(0);
  // clear the eof flag
  setEof(false);
  flush();
  // lseek instead of seek to be consistent with read
  off_t result = lseek(getFd(), offset, whence);
  setPosition(result);
  return result != (off_t)-1;
}

示例#3

文件： zip-file.cpp 项目： josephcopenhaver/hhvm

bool ZipFile::seek(int64_t offset, int whence /* = SEEK_SET */) {
  assert(m_gzFile);

  if (whence == SEEK_CUR) {
    off_t result = gzseek(m_gzFile, 0, SEEK_CUR);
    if (result != (off_t)-1) {
      offset += result - (bufferedLen() + getPosition());
    }
    if (offset > 0 && offset < bufferedLen()) {
      setReadPosition(getReadPosition() + offset);
      setPosition(getPosition() + offset);
      return true;
    }
    offset += getPosition();
    whence = SEEK_SET;
  }

  // invalidate the current buffer
  setWritePosition(0);
  setReadPosition(0);
  setEof(false);
  flush();
  off_t result = gzseek(m_gzFile, offset, whence);
  setPosition(result);
  return result != (off_t)-1;
}

示例#4

文件： plain-file.cpp 项目： AeroEng43/hhvm

bool PlainFile::rewind() {
  assert(valid());
  seek(0);
  setWritePosition(0);
  setReadPosition(0);
  setPosition(0);
  return true;
}

示例#5

文件： mem-file.cpp 项目： fredemmott/hhvm

bool MemFile::rewind() {
  assertx(m_len != -1);
  m_cursor = 0;
  setWritePosition(0);
  setReadPosition(0);
  setPosition(0);
  return true;
}

示例#6

文件： zip-file.cpp 项目： josephcopenhaver/hhvm

bool ZipFile::rewind() {
  assert(m_gzFile);
  seek(0);
  setWritePosition(0);
  setReadPosition(0);
  setPosition(0);
  setEof(false);
  gzrewind(m_gzFile);
  return true;
}

示例#7

文件： IndexBuffer.cpp 项目： google/angle

angle::Result StreamingIndexBufferInterface::reserveBufferSpace(const gl::Context *context,
                                                                unsigned int size,
                                                                gl::DrawElementsType indexType)
{
    unsigned int curBufferSize = getBufferSize();
    unsigned int writePos      = getWritePosition();
    if (size > curBufferSize)
    {
        ANGLE_TRY(setBufferSize(context, std::max(size, 2 * curBufferSize), indexType));
        setWritePosition(0);
    }
    else if (writePos + size > curBufferSize || writePos + size < writePos)
    {
        ANGLE_TRY(discard(context));
        setWritePosition(0);
    }

    return angle::Result::Continue;
}

示例#8

文件： VertexBuffer.cpp 项目： rtwf/skia-externals

bool StreamingVertexBufferInterface::reserveSpace(unsigned int size)
{
    bool result = true;
    unsigned int curBufferSize = getBufferSize();
    if (size > curBufferSize)
    {
        result = setBufferSize(std::max(size, 3 * curBufferSize / 2));
        setWritePosition(0);
    }
    else if (getWritePosition() + size > curBufferSize)
    {
        if (!discard())
        {
            return false;
        }
        setWritePosition(0);
    }

    return result;
}

示例#9

文件： IndexBuffer.cpp 项目： WHS-TechOps/Aviator

bool StreamingIndexBufferInterface::reserveBufferSpace(unsigned int size, GLenum indexType)
{
    bool result = true;
    unsigned int curBufferSize = getBufferSize();
    unsigned int writePos = getWritePosition();
    if (size > curBufferSize)
    {
        result = setBufferSize(std::max(size, 2 * curBufferSize), indexType);
        setWritePosition(0);
    }
    else if (writePos + size > curBufferSize || writePos + size < writePos)
    {
        if (!discard())
        {
            return false;
        }
        setWritePosition(0);
    }

    return result;
}

示例#10

文件： VertexBuffer.cpp 项目： Drakey83/steamlink-sdk

gl::Error StreamingVertexBufferInterface::reserveSpace(unsigned int size)
{
    unsigned int curBufferSize = getBufferSize();
    if (size > curBufferSize)
    {
        gl::Error error = setBufferSize(std::max(size, 3 * curBufferSize / 2));
        if (error.isError())
        {
            return error;
        }
        setWritePosition(0);
    }
    else if (getWritePosition() + size > curBufferSize)
    {
        gl::Error error = discard();
        if (error.isError())
        {
            return error;
        }
        setWritePosition(0);
    }

    return gl::Error(GL_NO_ERROR);
}

示例#11

文件： user-file.cpp 项目： HilayPatel/hhvm

bool UserFile::seek(int64_t offset, int whence /* = SEEK_SET */) {
  assert(seekable());

  // Seek within m_buffer if we can, otherwise kill it and call user stream_seek / stream_tell
  if (whence == SEEK_CUR &&
      0 <= getReadPosition() + offset &&
           getReadPosition() + offset < getWritePosition()) {
    setReadPosition(getReadPosition() + offset);
    setPosition(getPosition() + offset);
    return true;
  } else if (whence == SEEK_SET &&
             0 <= offset - getPosition() + getReadPosition() &&
             offset - getPosition() + getReadPosition() < getWritePosition()) {
    setReadPosition(offset - getPosition() + getReadPosition());
    setPosition(offset);
    return true;
  } else {
    if (whence == SEEK_CUR) {
      offset += getReadPosition() - getWritePosition();
    }
    setReadPosition(0);
    setWritePosition(0);
  }

  // bool stream_seek($offset, $whence)
  bool invoked = false;
  bool sought  = invoke(
    m_StreamSeek, s_stream_seek, make_packed_array(offset, whence), invoked
  ).toBoolean();
  if (!invoked) {
    always_assert("No seek method? But I found one earlier?");
  }
  if (!sought) {
    return false;
  }

  // int stream_tell()
  Variant ret = invoke(m_StreamTell, s_stream_tell, Array::Create(), invoked);
  if (!invoked) {
    raise_warning("%s::stream_tell is not implemented!", m_cls->name()->data());
    return false;
  }
  setPosition(ret.isInteger() ? ret.toInt64() : -1);
  return true;
}

示例#12

文件： mem-file.cpp 项目： fredemmott/hhvm

bool MemFile::seek(int64_t offset, int whence /* = SEEK_SET */) {
  assertx(m_len != -1);
  if (whence == SEEK_CUR) {
    if (offset > 0 && offset < bufferedLen()) {
      setReadPosition(getReadPosition() + offset);
      setPosition(getPosition() + offset);
      return true;
    }
    offset += getPosition();
    whence = SEEK_SET;
  }

  // invalidate the current buffer
  setWritePosition(0);
  setReadPosition(0);
  if (whence == SEEK_SET) {
    m_cursor = offset;
  } else {
    assertx(whence == SEEK_END);
    m_cursor = m_len + offset;
  }
  setPosition(m_cursor);
  return true;
}