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/* $Id: pgc_checksum.c 1022 2010-08-06 07:28:07Z fabien $
*
* This function computes a simple and fast checksum of a text.
* It is unclear to me what happends on different encodings.
* NOT CRYPTOGRAPHICALLY SECURE.
*/
#include "postgres.h"
#include "executor/spi.h"
#ifdef PG_MODULE_MAGIC
PG_MODULE_MAGIC;
#endif
extern Datum text_checksum2(PG_FUNCTION_ARGS);
extern Datum text_checksum4(PG_FUNCTION_ARGS);
extern Datum text_checksum8(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(text_checksum2);
PG_FUNCTION_INFO_V1(text_checksum4);
PG_FUNCTION_INFO_V1(text_checksum8);
#include "jenkins.c"
Datum text_checksum2(PG_FUNCTION_ARGS)
{
unsigned char * data;
size_t size;
if (PG_ARGISNULL(0))
{
data = NULL, size = 0;
}
else
{
text *t = PG_GETARG_TEXT_P(0);
size = VARSIZE(t) - VARHDRSZ;
data = (unsigned char *) VARDATA(t);
}
PG_RETURN_INT16(checksum_int2(data, size));
}
Datum text_checksum4(PG_FUNCTION_ARGS)
{
unsigned char * data;
size_t size;
if (PG_ARGISNULL(0))
{
data = NULL, size = 0;
}
else
{
text *t = PG_GETARG_TEXT_P(0);
size = VARSIZE(t) - VARHDRSZ;
data = (unsigned char *) VARDATA(t);
}
PG_RETURN_INT32(checksum_int4(data, size));
}
Datum text_checksum8(PG_FUNCTION_ARGS)
{
unsigned char * data;
size_t size;
if (PG_ARGISNULL(0))
{
data = NULL, size = 0;
}
else
{
text * t = PG_GETARG_TEXT_P(0);
data = (unsigned char *) VARDATA(t);
size = VARSIZE(t) - VARHDRSZ;
}
PG_RETURN_INT64(checksum_int8(data, size));
}
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