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/* $Id: sqlite_checksum.c 1520 2014-08-03 11:27:06Z coelho $ */
/*
* SQLite extensions for pg_comparator.
*
* provide checksum functions: cksum2, cksum4 and cksum8.
* provide integer aggregates: xor and isum.
*/
#include <stdio.h>
#include <assert.h>
#define COMPILE_SQLITE_EXTENSIONS_AS_LOADABLE_MODULE 1
#ifdef COMPILE_SQLITE_EXTENSIONS_AS_LOADABLE_MODULE
// compile as loadable module
#include <sqlite3ext.h>
SQLITE_EXTENSION_INIT1
#else // not loadable
#include <sqlite3.h>
#endif // COMPILE_SQLITE_EXTENSIONS_AS_LOADABLE_MODULE
// plain C implementations
#include "jenkins.c"
/******************************************************* CHECKSUMS FUNCTIONS */
static void sqlite_checksum_int2(
sqlite3_context * ctx,
int argc,
sqlite3_value ** argv)
{
assert(argc==1);
const unsigned char * txt;
size_t len;
switch (sqlite3_value_type(argv[0])) {
case SQLITE_NULL:
txt = NULL;
len = 0;
break;
case SQLITE_TEXT:
txt = sqlite3_value_text(argv[0]);
len = sqlite3_value_bytes(argv[0]);
break;
// hmmm... should I do something else?
case SQLITE_INTEGER:
case SQLITE_FLOAT:
case SQLITE_BLOB:
default:
sqlite3_result_error(ctx, "expecting TEXT or NULL", -1);
return;
}
sqlite3_result_int(ctx, checksum_int2(txt, len));
}
static void sqlite_checksum_int4(
sqlite3_context * ctx,
int argc,
sqlite3_value ** argv)
{
assert(argc==1);
const unsigned char * txt;
size_t len;
switch (sqlite3_value_type(argv[0])) {
case SQLITE_NULL:
txt = NULL;
len = 0;
break;
case SQLITE_TEXT:
txt = sqlite3_value_text(argv[0]);
len = sqlite3_value_bytes(argv[0]);
break;
// hmmm... should I do something else?
case SQLITE_INTEGER:
case SQLITE_FLOAT:
case SQLITE_BLOB:
default:
sqlite3_result_error(ctx, "expecting TEXT or NULL", -1);
return;
}
sqlite3_result_int(ctx, checksum_int4(txt, len));
}
static void sqlite_checksum_int8(
sqlite3_context * ctx,
int argc,
sqlite3_value ** argv)
{
assert(argc==1);
const unsigned char * txt;
size_t len;
switch (sqlite3_value_type(argv[0])) {
case SQLITE_NULL:
txt = NULL;
len = 0;
break;
case SQLITE_TEXT:
txt = sqlite3_value_text(argv[0]);
len = sqlite3_value_bytes(argv[0]);
break;
// hmmm... should I do something else?
case SQLITE_INTEGER:
case SQLITE_FLOAT:
case SQLITE_BLOB:
default:
sqlite3_result_error(ctx, "expecting TEXT or NULL", -1);
return;
}
sqlite3_result_int64(ctx, checksum_int8(txt, len));
}
static void sqlite_fnv_int2(
sqlite3_context * ctx,
int argc,
sqlite3_value ** argv)
{
assert(argc==1);
const unsigned char * txt;
size_t len;
switch (sqlite3_value_type(argv[0])) {
case SQLITE_NULL:
txt = NULL;
len = 0;
break;
case SQLITE_TEXT:
txt = sqlite3_value_text(argv[0]);
len = sqlite3_value_bytes(argv[0]);
break;
// hmmm... should I do something else?
case SQLITE_INTEGER:
case SQLITE_FLOAT:
case SQLITE_BLOB:
default:
sqlite3_result_error(ctx, "expecting TEXT or NULL", -1);
return;
}
sqlite3_result_int(ctx, checksum_int2(txt, len));
}
static void sqlite_fnv_int4(
sqlite3_context * ctx,
int argc,
sqlite3_value ** argv)
{
assert(argc==1);
const unsigned char * txt;
size_t len;
switch (sqlite3_value_type(argv[0])) {
case SQLITE_NULL:
txt = NULL;
len = 0;
break;
case SQLITE_TEXT:
txt = sqlite3_value_text(argv[0]);
len = sqlite3_value_bytes(argv[0]);
break;
// hmmm... should I do something else?
case SQLITE_INTEGER:
case SQLITE_FLOAT:
case SQLITE_BLOB:
default:
sqlite3_result_error(ctx, "expecting TEXT or NULL", -1);
return;
}
sqlite3_result_int(ctx, checksum_int4(txt, len));
}
static void sqlite_fnv_int8(
sqlite3_context * ctx,
int argc,
sqlite3_value ** argv)
{
assert(argc==1);
const unsigned char * txt;
size_t len;
switch (sqlite3_value_type(argv[0])) {
case SQLITE_NULL:
txt = NULL;
len = 0;
break;
case SQLITE_TEXT:
txt = sqlite3_value_text(argv[0]);
len = sqlite3_value_bytes(argv[0]);
break;
// hmmm... should I do something else?
case SQLITE_INTEGER:
case SQLITE_FLOAT:
case SQLITE_BLOB:
default:
sqlite3_result_error(ctx, "expecting TEXT or NULL", -1);
return;
}
sqlite3_result_int64(ctx, checksum_int8(txt, len));
}
/***************************************************** INTEGER XOR AGGREGATE */
static void ixor_step(
sqlite3_context * ctx,
int argc,
sqlite3_value ** argv)
{
assert(argc==1);
int64_t * val = sqlite3_aggregate_context(ctx, sizeof(int64_t));
if (sqlite3_value_type(argv[0])==SQLITE_INTEGER)
*val ^= sqlite3_value_int64(argv[0]);
// else just ignore...
}
// integer SUM without fancy overflow handling
static void isum_step(
sqlite3_context * ctx,
int argc,
sqlite3_value ** argv)
{
assert(argc==1);
int64_t * val = sqlite3_aggregate_context(ctx, sizeof(int64_t));
if (sqlite3_value_type(argv[0])==SQLITE_INTEGER)
*val += sqlite3_value_int64(argv[0]);
// else just ignore...
}
static void int_finalize(sqlite3_context * ctx)
{
int64_t * val = sqlite3_aggregate_context(ctx, 0);
sqlite3_result_int64(ctx, val? *val: 0);
}
/***************************************************************** AUTO LOAD */
#ifdef COMPILE_SQLITE_EXTENSIONS_AS_LOADABLE_MODULE
// autoload checksum functions
int sqlite3_extension_init(
sqlite3 * db,
char ** pzErrMsg,
const sqlite3_api_routines *pApi)
{
SQLITE_EXTENSION_INIT2(pApi);
sqlite3_create_function(db,
// name, #arg, txt, data,
"cksum2", 1, SQLITE_UTF8, NULL,
// func, step, final
sqlite_checksum_int2, NULL, NULL);
sqlite3_create_function(db,
// name, #arg, txt, data,
"cksum4", 1, SQLITE_UTF8, NULL,
// func, step, final
sqlite_checksum_int4, NULL, NULL);
sqlite3_create_function(db,
// name, #arg, txt, data,
"cksum8", 1, SQLITE_UTF8, NULL,
// func, step, final
sqlite_checksum_int8, NULL, NULL);
sqlite3_create_function(db,
// name, #arg, txt, data,
"fnv2", 1, SQLITE_UTF8, NULL,
// func, step, final
sqlite_fnv_int2, NULL, NULL);
sqlite3_create_function(db,
// name, #arg, txt, data,
"fnv4", 1, SQLITE_UTF8, NULL,
// func, step, final
sqlite_fnv_int4, NULL, NULL);
sqlite3_create_function(db,
// name, #arg, txt, data,
"fnv8", 1, SQLITE_UTF8, NULL,
// func, step, final
sqlite_fnv_int8, NULL, NULL);
sqlite3_create_function(db,
// name, #args, txt, data,
"xor", 1, SQLITE_UTF8, NULL,
// func, step, final
NULL, ixor_step, int_finalize);
sqlite3_create_function(db,
// name, #args, txt, data,
"isum", 1, SQLITE_UTF8, NULL,
// func, step, final
NULL, isum_step, int_finalize);
return 0;
}
#endif // COMPILE_SQLITE_EXTENSIONS_AS_LOADABLE_MODULE
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