Commit 4bb5a351 authored by Steve Holme's avatar Steve Holme
Browse files

endian: Added big endian read functions

parent 43792592

lib/curl_endian.c

+73 −0
Original line number Diff line number Diff line
@@ -97,6 +97,79 @@ unsigned __int64 Curl_read64_le(unsigned char *buf) 
}

#endif



/*

 * Curl_read16_be()

 *

 * This function converts a 16-bit integer from the big endian format, as

 * used in the incoming package to whatever endian format we're using

 * natively.

 *

 * Parameters:

 *

 * buf      [in]     - A pointer to a 2 byte buffer.

 *

 * Returns the integer.

 */

unsigned short Curl_read16_be(unsigned char *buf)

{

  return (unsigned short)(((unsigned short)buf[0] << 8) |

                          ((unsigned short)buf[1]));

}



/*

 * Curl_read32_be()

 *

 * This function converts a 32-bit integer from the big endian format, as

 * used in the incoming package to whatever endian format we're using

 * natively.

 *

 * Parameters:

 *

 * buf      [in]     - A pointer to a 4 byte buffer.

 *

 * Returns the integer.

 */

unsigned int Curl_read32_be(unsigned char *buf)

{

  return ((unsigned int)buf[0] << 24) | ((unsigned int)buf[1] << 16) |

         ((unsigned int)buf[2] << 8) | ((unsigned int)buf[3]);

}



/*

 * Curl_read64_be()

 *

 * This function converts a 64-bit integer from the big endian format, as

 * used in the incoming package to whatever endian format we're using

 * natively.

 *

 * Parameters:

 *

 * buf      [in]     - A pointer to a 8 byte buffer.

 *

 * Returns the integer.

 */

#if defined(HAVE_LONGLONG)

unsigned long long Curl_read64_be(unsigned char *buf)

{

  return ((unsigned long long)buf[0] << 54) |

         ((unsigned long long)buf[1] << 48) |

         ((unsigned long long)buf[2] << 40) |

         ((unsigned long long)buf[3] << 32) |

         ((unsigned long long)buf[4] << 24) |

         ((unsigned long long)buf[5] << 16) |

         ((unsigned long long)buf[6] << 8) |

         ((unsigned long long)buf[7]);

}

#else

unsigned __int64 Curl_read64_be(unsigned char *buf)

{

  return ((unsigned __int64)buf[0] << 54) | ((unsigned __int64)buf[1] << 48) |

         ((unsigned __int64)buf[2] << 40) | ((unsigned __int64)buf[3] << 32) |

         ((unsigned __int64)buf[4] << 24) | ((unsigned __int64)buf[5] << 16) |

         ((unsigned __int64)buf[6] << 8) | ((unsigned __int64)buf[7]);

}

#endif



/*

 * Curl_write16_le()

 *

lib/curl_endian.h

+15 −0
Original line number Diff line number Diff line
@@ -37,6 +37,21 @@ unsigned __int64 Curl_read64_le(unsigned char *buf); 
#endif

#endif



/* Converts a 16-bit integer from big endian */

unsigned short Curl_read16_be(unsigned char *buf);



/* Converts a 32-bit integer from big endian */

unsigned int Curl_read32_be(unsigned char *buf);



#if (CURL_SIZEOF_CURL_OFF_T > 4)

/* Converts a 64-bit integer from big endian */

#if defined(HAVE_LONGLONG)

unsigned long long Curl_read64_be(unsigned char *buf);

#else

unsigned __int64 Curl_read64_be(unsigned char *buf);

#endif

#endif



/* Converts a 16-bit integer to little endian */

void Curl_write16_le(const short value, unsigned char *buffer);