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/*
*
* IRBOX, an Ivy driver for infra-red remote controls
*
* Copyright 1998-1999
* Centre d'Etudes de la Navigation Aerienne
*
* Tables for decoding events
*
* $Id$
*
*/
#include "irtable.h"
#include "irdev.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
typedef struct _irtablecell IrTableCell;
struct _irtablecell {
IrTable* table;
unsigned char code[6];
const char* key;
IrTableCell* next;
};
#define KEYCELLS 127
#define CODECELLS 1023
static IrTableCell* KeyToCell [KEYCELLS];
static IrTableCell* CodeToCell [CODECELLS];
static int Initialized = 0;
IrTable*
IrCreateTable ()
{
if (!Initialized) {
Initialized = 1;
memset (KeyToCell, 0, sizeof (KeyToCell));
memset (CodeToCell, 0, sizeof (CodeToCell));
}
return (IrTable*) malloc (sizeof (IrTable));
}
void
IrTableName (IrTable* t, const char* n)
{
t->name = strdup (n);
}
void
IrTableType (IrTable* t, const char* type)
{
t->type = strdup (type);
}
void
IrTableAddBrand (IrTable* t, const char* b)
{
}
static unsigned int
IrHashKey (const char* key)
{
register unsigned int h = 0;
register const char* p = key;
while (*p)
h += (h << 3) + *p++; /* this hash function was stolen from Tcl */
return h % KEYCELLS;
}
static unsigned int
IrHashCode (const unsigned char* code)
{
register unsigned int h = 0;
register const unsigned char* p = code;
register const unsigned char* q = p+6;
while (p < q)
h += (h << 3) + *p++; /* A ADAPTER */
return h % CODECELLS;
}
void
IrTableAddKey (IrTable* t, const char* k, int c0, int c1, int c2, int c3 , int c4, int c5)
{
IrTableCell* c = (IrTableCell*) malloc (sizeof (IrTableCell));
IrTableCell** cc;
IrTableCell* p;
c->table = t;
c->code[0] = c0;
c->code[1] = c1;
c->code[2] = c2;
c->code[3] = c3;
c->code[4] = c4;
c->code[5] = c5;
cc = CodeToCell + IrHashCode (c->code);
/* collision handling */
p = *cc;
while (p) {
if (strncmp (p->code, c->code, 6) == 0) {
fprintf (stderr, "Code for key \'%s\' on %s", k, t->name);
fprintf (stderr, " was already registered");
fprintf (stderr, " for key \'%s\' on %s\n", p->key, p->table->name);
free (c);
return;
}
p = p->next;
}
/* fine, we can keep on storing that key */
c->key = strdup (k);
c->next = *cc;
*cc = c;
}
int
IrTableTranslateCode (const unsigned char* code, IrTable** table, const char** key)
{
IrTableCell* c;
c = CodeToCell [IrHashCode (code)];
while (c) {
if (strncmp (code, c->code, 6) == 0)
break;
c = c->next;
}
if (c) {
if (table) *table = c->table;
if (key) *key = c->key;
} else {
if (table) *table = 0;
if (key) *key = 0;
}
return (int) (c);
}
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