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#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <postgres.h>
#include <fmgr.h>
PG_MODULE_MAGIC;
Datum asn1oid_input(PG_FUNCTION_ARGS);
Datum asn1oid_output(PG_FUNCTION_ARGS);
Datum asn1oid_eq(PG_FUNCTION_ARGS);
Datum asn1oid_ne(PG_FUNCTION_ARGS);
Datum asn1oid_lt(PG_FUNCTION_ARGS);
Datum asn1oid_gt(PG_FUNCTION_ARGS);
Datum asn1oid_le(PG_FUNCTION_ARGS);
Datum asn1oid_ge(PG_FUNCTION_ARGS);
Datum asn1oid_cmp(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(asn1oid_input);
PG_FUNCTION_INFO_V1(asn1oid_output);
PG_FUNCTION_INFO_V1(asn1oid_eq);
PG_FUNCTION_INFO_V1(asn1oid_ne);
PG_FUNCTION_INFO_V1(asn1oid_lt);
PG_FUNCTION_INFO_V1(asn1oid_gt);
PG_FUNCTION_INFO_V1(asn1oid_le);
PG_FUNCTION_INFO_V1(asn1oid_ge);
PG_FUNCTION_INFO_V1(asn1oid_cmp);
struct asn1oid
{
int32 vl_len_;
uint32 data[1];
};
typedef struct asn1oid asn1oid;
static unsigned int size(asn1oid const *oid)
{
return (VARSIZE(oid) - offsetof(asn1oid, data)) / sizeof(uint32);
}
#define PG_GETARG_ASN1OID(x) (asn1oid *)DatumGetPointer(PG_DETOAST_DATUM(PG_GETARG_DATUM(x)))
Datum asn1oid_input(PG_FUNCTION_ARGS)
{
char *str = PG_GETARG_CSTRING(0);
uint32 tmp[64];
unsigned int i, j;
char const *c;
unsigned int size;
asn1oid *ret;
i = 0;
tmp[i] = 0;
for(c = str; *c; ++c)
{
switch(*c)
{
case '0':
tmp[i] *= 10;
break;
case '1':
tmp[i] *= 10;
tmp[i] += 1;
break;
case '2':
tmp[i] *= 10;
tmp[i] += 2;
break;
case '3':
tmp[i] *= 10;
tmp[i] += 3;
break;
case '4':
tmp[i] *= 10;
tmp[i] += 4;
break;
case '5':
tmp[i] *= 10;
tmp[i] += 5;
break;
case '6':
tmp[i] *= 10;
tmp[i] += 6;
break;
case '7':
tmp[i] *= 10;
tmp[i] += 7;
break;
case '8':
tmp[i] *= 10;
tmp[i] += 8;
break;
case '9':
tmp[i] *= 10;
tmp[i] += 9;
break;
case '.':
if(c == str)
PG_RETURN_POINTER(0);
++i;
if(i >= 64)
PG_RETURN_POINTER(0);
tmp[i] = 0;
break;
default:
PG_RETURN_POINTER(0);
}
}
if(c == str)
PG_RETURN_POINTER(0);
if(c[-1] == '.')
PG_RETURN_POINTER(0);
++i;
size = offsetof(asn1oid, data) + sizeof(uint32) * i;
ret = palloc(size);
SET_VARSIZE(ret, size);
for(j = 0; j < i; ++j)
ret->data[j] = tmp[j];
PG_RETURN_POINTER(ret);
}
Datum asn1oid_output(PG_FUNCTION_ARGS)
{
asn1oid *oid = PG_GETARG_ASN1OID(0);
unsigned int len = size(oid);
unsigned int size = 0;
unsigned int i;
char *ret, *j;
if(len == 0)
PG_RETURN_NULL();
for(i = 0; i < len; ++i)
{
uint32 t = oid->data[i];
if(t < 10)
size += 2;
else if(t < 100)
size += 3;
else if(t < 1000)
size += 4;
else if(t < 10000)
size += 5;
else if(t < 100000)
size += 6;
else if(t < 1000000)
size += 7;
else if(t < 10000000)
size += 8;
else if(t < 100000000)
size += 9;
else if(t < 1000000000)
size += 10;
else
size += 11;
}
ret = palloc(size);
j = ret;
for(i = 0; i < len; ++i)
{
uint32 t = oid->data[i];
char *b = j;
char *r;
do
{
*j++ = '0' + t % 10;
t /= 10;
}
while(t);
r = j;
for(--r; b < r; ++b, --r)
{
char t = *r;
*r = *b;
*b = t;
}
*j++ = '.';
}
j[-1] = 0;
PG_FREE_IF_COPY(oid, 0);
PG_RETURN_CSTRING(ret);
}
static int cmp(asn1oid const *lhs, asn1oid const *rhs)
{
unsigned int lhs_size = size(lhs);
unsigned int rhs_size = size(rhs);
unsigned int size = (lhs_size < rhs_size)?lhs_size:rhs_size;
unsigned int i;
for(i = 0; i < size; ++i)
{
uint32 l = lhs->data[i];
uint32 r = rhs->data[i];
if(l < r)
return -1;
if(l > r)
return 1;
}
if(lhs_size < rhs_size)
return -1;
if(lhs_size > rhs_size)
return 1;
return 0;
}
Datum asn1oid_eq(PG_FUNCTION_ARGS)
{
asn1oid *lhs = PG_GETARG_ASN1OID(0);
asn1oid *rhs = PG_GETARG_ASN1OID(1);
int res = cmp(lhs, rhs);
PG_FREE_IF_COPY(lhs, 0);
PG_FREE_IF_COPY(rhs, 1);
PG_RETURN_BOOL(res == 0);
}
Datum asn1oid_ne(PG_FUNCTION_ARGS)
{
asn1oid *lhs = PG_GETARG_ASN1OID(0);
asn1oid *rhs = PG_GETARG_ASN1OID(1);
int res = cmp(lhs, rhs);
PG_FREE_IF_COPY(lhs, 0);
PG_FREE_IF_COPY(rhs, 1);
PG_RETURN_BOOL(res != 0);
}
Datum asn1oid_lt(PG_FUNCTION_ARGS)
{
asn1oid *lhs = PG_GETARG_ASN1OID(0);
asn1oid *rhs = PG_GETARG_ASN1OID(1);
int res = cmp(lhs, rhs);
PG_FREE_IF_COPY(lhs, 0);
PG_FREE_IF_COPY(rhs, 1);
PG_RETURN_BOOL(res < 0);
}
Datum asn1oid_gt(PG_FUNCTION_ARGS)
{
asn1oid *lhs = PG_GETARG_ASN1OID(0);
asn1oid *rhs = PG_GETARG_ASN1OID(1);
int res = cmp(lhs, rhs);
PG_FREE_IF_COPY(lhs, 0);
PG_FREE_IF_COPY(rhs, 1);
PG_RETURN_BOOL(res > 0);
}
Datum asn1oid_le(PG_FUNCTION_ARGS)
{
asn1oid *lhs = PG_GETARG_ASN1OID(0);
asn1oid *rhs = PG_GETARG_ASN1OID(1);
int res = cmp(lhs, rhs);
PG_FREE_IF_COPY(lhs, 0);
PG_FREE_IF_COPY(rhs, 1);
PG_RETURN_BOOL(res <= 0);
}
Datum asn1oid_ge(PG_FUNCTION_ARGS)
{
asn1oid *lhs = PG_GETARG_ASN1OID(0);
asn1oid *rhs = PG_GETARG_ASN1OID(1);
int res = cmp(lhs, rhs);
PG_FREE_IF_COPY(lhs, 0);
PG_FREE_IF_COPY(rhs, 1);
PG_RETURN_BOOL(res >= 0);
}
Datum asn1oid_cmp(PG_FUNCTION_ARGS)
{
asn1oid *lhs = PG_GETARG_ASN1OID(0);
asn1oid *rhs = PG_GETARG_ASN1OID(1);
int res = cmp(lhs, rhs);
PG_FREE_IF_COPY(lhs, 0);
PG_FREE_IF_COPY(rhs, 1);
PG_RETURN_INT32(res);
}
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