/* 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/.

 */

#ifndef _nsStreamFunctions_h_

#define _nsStreamFunctions_h_

#include "nscore.h"

#include "nsIInputStream.h"

#include "nsIOutputStream.h"

/*

 * ZIP file data is stored little-endian. These are helper functions to read and

 * write little endian data to/from a char buffer.

 * The off argument, where present, is incremented according to the number of

 * bytes consumed from the buffer.

 */

inline void WRITE8(uint8_t* buf, uint32_t* off, uint8_t val)

{

  buf[(*off)++] = val;

}

inline void WRITE16(uint8_t* buf, uint32_t* off, uint16_t val)

{

  WRITE8(buf, off, val & 0xff);

  WRITE8(buf, off, (val >> 8) & 0xff);

}

inline void WRITE32(uint8_t* buf, uint32_t* off, uint32_t val)

{

  WRITE16(buf, off, val & 0xffff);

  WRITE16(buf, off, (val >> 16) & 0xffff);

}

inline uint8_t READ8(const uint8_t* buf, uint32_t* off)

{

  return buf[(*off)++];

}

inline uint16_t READ16(const uint8_t* buf, uint32_t* off)

{

  uint16_t val = READ8(buf, off);

  val |= READ8(buf, off) << 8;

  return val;

}

inline uint32_t READ32(const uint8_t* buf, uint32_t* off)

{

  uint32_t val = READ16(buf, off);

  val |= READ16(buf, off) << 16;

  return val;

}

inline uint32_t PEEK32(const uint8_t* buf)

{

  return (uint32_t)( (buf [0]      ) |

                     (buf [1] <<  8) |

                     (buf [2] << 16) |

                     (buf [3] << 24) );

}

nsresult ZW_ReadData(nsIInputStream *aStream, char *aBuffer, uint32_t aCount);

nsresult ZW_WriteData(nsIOutputStream *aStream, const char *aBuffer,

                      uint32_t aCount);

#endif