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endian: Added big endian read functions

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This commit is contained in:
Steve Holme 2015-01-01 20:26:17 +00:00
parent 43792592ca
commit 4bb5a351b2
2 changed files with 88 additions and 0 deletions
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73
lib/curl_endian.c
View File

@ -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()
*

15
lib/curl_endian.h
View File

@ -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);