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curl_endian.c
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curl_endian.c
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at http://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "curl_setup.h"
#include "curl_endian.h"
/*
* Curl_read16_le()
*
* This function converts a 16-bit integer from the little 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_le(unsigned char *buf)
{
return (unsigned short)(((unsigned short)buf[0]) |
((unsigned short)buf[1] << 8));
}
/*
* Curl_read32_le()
*
* This function converts a 32-bit integer from the little 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_le(unsigned char *buf)
{
return ((unsigned int)buf[0]) | ((unsigned int)buf[1] << 8) |
((unsigned int)buf[2] << 16) | ((unsigned int)buf[3] << 24);
}
#if (CURL_SIZEOF_CURL_OFF_T > 4)
/*
* Curl_read64_le()
*
* This function converts a 64-bit integer from the little 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_le(unsigned char *buf)
{
return ((unsigned long long)buf[0]) |
((unsigned long long)buf[1] << 8) |
((unsigned long long)buf[2] << 16) |
((unsigned long long)buf[3] << 24) |
((unsigned long long)buf[4] << 32) |
((unsigned long long)buf[5] << 40) |
((unsigned long long)buf[6] << 48) |
((unsigned long long)buf[7] << 56);
}
#else
unsigned __int64 Curl_read64_le(unsigned char *buf)
{
return ((unsigned __int64)buf[0]) | ((unsigned __int64)buf[1] << 8) |
((unsigned __int64)buf[2] << 16) | ((unsigned __int64)buf[3] << 24) |
((unsigned __int64)buf[4] << 32) | ((unsigned __int64)buf[5] << 40) |
((unsigned __int64)buf[6] << 48) | ((unsigned __int64)buf[7] << 56);
}
#endif
#endif /* CURL_SIZEOF_CURL_OFF_T > 4 */
/*
* 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]);
}
#if (CURL_SIZEOF_CURL_OFF_T > 4)
/*
* 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] << 56) |
((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] << 56) | ((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
#endif /* CURL_SIZEOF_CURL_OFF_T > 4 */
/*
* Curl_write16_le()
*
* This function converts a 16-bit integer from the native endian format,
* to little endian format ready for sending down the wire.
*
* Parameters:
*
* value [in] - The 16-bit integer value.
* buffer [in] - A pointer to the output buffer.
*/
void Curl_write16_le(const short value, unsigned char *buffer)
{
buffer[0] = (char)(value & 0x00FF);
buffer[1] = (char)((value & 0xFF00) >> 8);
}
/*
* Curl_write32_le()
*
* This function converts a 32-bit integer from the native endian format,
* to little endian format ready for sending down the wire.
*
* Parameters:
*
* value [in] - The 32-bit integer value.
* buffer [in] - A pointer to the output buffer.
*/
void Curl_write32_le(const int value, unsigned char *buffer)
{
buffer[0] = (char)(value & 0x000000FF);
buffer[1] = (char)((value & 0x0000FF00) >> 8);
buffer[2] = (char)((value & 0x00FF0000) >> 16);
buffer[3] = (char)((value & 0xFF000000) >> 24);
}
#if (CURL_SIZEOF_CURL_OFF_T > 4)
/*
* Curl_write64_le()
*
* This function converts a 64-bit integer from the native endian format,
* to little endian format ready for sending down the wire.
*
* Parameters:
*
* value [in] - The 64-bit integer value.
* buffer [in] - A pointer to the output buffer.
*/
#if defined(HAVE_LONGLONG)
void Curl_write64_le(const long long value, unsigned char *buffer)
#else
void Curl_write64_le(const __int64 value, unsigned char *buffer)
#endif
{
Curl_write32_le((int)value, buffer);
Curl_write32_le((int)(value >> 32), buffer + 4);
}
#endif /* CURL_SIZEOF_CURL_OFF_T > 4 */