remap.c

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};

#define isdigok(m, d) (m[(d) >> 3] & (1 << ((d) & 7)))

static unsigned short
#ifdef __STDC__
my_atous(unsigned char *s, unsigned char **end, int base)
#else
my_atous(s, end, base)
unsigned char *s, **end;
int base;
#endif
{
    unsigned short v;
    unsigned char *dmap;

    if (s == 0 || *s == 0)
      return 0;

    /*
     * Make sure the radix is something recognizable.  Default to 10.
     */
    switch (base) {
      case 8: dmap = odigits; break;
      case 16: dmap = hdigits; break;
      default: base = 10; dmap = ddigits; break;
    }

    /*
     * Check for the special hex prefix.
     */
    if (*s == '0' && (*(s + 1) == 'x' || *(s + 1) == 'X')) {
        base = 16;
        dmap = hdigits;
        s += 2;
    }

    for (v = 0; isdigok(dmap, *s); s++)
      v = (v * base) + a2i[(int) *s];

    if (end != 0)
      *end = s;

    return v;
}

/********************************************************************
 *
 * Routines to load, unload, and use mapping tables to remap BDF fonts
 * generated using ttf2bdf.
 *
 ********************************************************************/

/*
 * Strings used to store the registry and encoding values specified
 * in the mapping table.
 */
static char *registry;
static char *encoding;

/*
 * Trie node structure.
 */
typedef struct {
    unsigned short key;	/* Key value.					*/
    unsigned short val;	/* Data for the key.				*/
    unsigned long sibs;	/* Offset of siblings from trie beginning.	*/
    unsigned long kids; /* Offset of children from trie beginning.	*/
} node_t;

/*
 * The trie used for remapping codes.
 */
static node_t *nodes;
static unsigned long nodes_size = 0;
static unsigned long nodes_used = 0;

/*
 * Gets the next available node in the trie.
 */
static unsigned long
#ifdef __STDC__
getnode(unsigned short key)
#else
getnode(key)
unsigned short key;
#endif
{
    unsigned long loc;
    node_t *np;

    if (nodes_used == nodes_size) {
        if (nodes_size == 0)
          nodes = (node_t *) malloc(sizeof(node_t) << 7);
        else
          nodes = (node_t *) realloc((char *) nodes, sizeof(node_t) *
                                     (nodes_size + 128));
        np = nodes + nodes_size;
        nodes_size += 128;
        (void) memset((char *) np, 0, sizeof(node_t) << 7);
    }

    loc = nodes_used++;
    np = nodes + loc;
    np->kids = np->sibs = 0;
    np->key = key;
    return loc;
}

/*
 * Inserts a node in the trie.
 */
static void
#ifdef __STDC__
trie_insert(unsigned short key, unsigned short val)
#else
trie_insert(key, val)
unsigned short key, val;
#endif
{
    unsigned long i, n, t, l;
    unsigned short codes[2];

    /*
     * Convert the incoming key into two codes to make the trie lookup more
     * efficient.
     */
    codes[0] = (key >> 8) & 0xff;
    codes[1] = key & 0xff;

    for (i = t = 0; i < 2; i++) {
        if (nodes[t].kids == 0) {
            n = getnode(codes[i]);
            nodes[t].kids = t = n;
        } else if (nodes[nodes[t].kids].key == codes[i])
          t = nodes[t].kids;
        else if (nodes[nodes[t].kids].key > codes[i]) {
            n = getnode(codes[i]);
            nodes[n].sibs = nodes[t].kids;
            nodes[t].kids = t = n;
        } else {
            t = nodes[t].kids;
            for (l = t; nodes[t].sibs && nodes[t].key < codes[i]; ) {
                l = t;
                t = nodes[t].sibs;
            }
            if (nodes[t].key < codes[i]) {
                n = getnode(codes[i]);
                nodes[t].sibs = t = n;
            } else if (nodes[t].key > codes[i]) {
                n = getnode(codes[i]);
                nodes[n].sibs = t;
                nodes[l].sibs = t = n;
            }
        }
    }

    /*
     * Set the value in the leaf node.
     */
    nodes[t].val = val;
}

/*
 * List used by the routine that parses the map lines.
 */
static list_t list;

/*
 * Routine to parse each line of the mapping file.
 */
static int
#ifdef __STDC__
add_mapping(unsigned char *line, unsigned long linelen, unsigned long lineno,
            void *client_data)
#else
add_mapping(line, linelen, lineno, client_data)
unsigned char *line;
unsigned long linelen, lineno;
void *client_data;
#endif
{
    unsigned short key, val;

    /*
     * Split the line into parts separted by one or more spaces or tabs.
     */
    splitline((unsigned char *) " \t+", line, linelen, &list);

    /*
     * Check to see if the line starts with one of the keywords.
     */
    if (memcmp((char *) list.field[0], "REGISTRY", 8) == 0) {
        /*
         * Collect the XLFD CHARSET_REGISTRY value.
         */
        if (registry != 0)
          free((char *) registry);
        if ((val = strlen((char *) list.field[1])) == 0)
          registry = 0;
        else {
            registry = (char *) malloc(val + 1);
            (void) memcpy(registry, (char *) list.field[1], val + 1);
        }
        return 0;
    }

    if (memcmp((char *) list.field[0], "ENCODING", 8) == 0) {
        /*
         * Collect the XLFD CHARSET_ENCODING value.
         */
        if (encoding != 0)
          free((char *) encoding);
        if ((val = strlen((char *) list.field[1])) == 0)
          encoding = 0;
        else {
            encoding = (char *) malloc(val + 1);
            (void) memcpy(encoding, (char *) list.field[1], val + 1);
        }
        return 0;
    }

    /*
     * Get the second field value as the key (the Unicode value).  Always
     * assume the values are in hex.
     */
    key = my_atous(list.field[1], 0, 16);
    val = my_atous(list.field[0], 0, 16);

    trie_insert(key, val);

    return 0;
}

/********************************************************************
 *
 * API for mapping table support.
 *
 ********************************************************************/

int
#ifdef __STDC__
ttf2bdf_load_map(FILE *in)
#else
ttf2bdf_load_map(in)
FILE *in;
#endif
{
    unsigned long lineno;

    /*
     * Allocate some nodes initially.
     */
    if (nodes_size == 0) {
        nodes = (node_t *) malloc(sizeof(node_t) << 7);
        nodes_size = 128;
    }

    /*
     * Reset the trie in case more than one gets loaded for some reason.
     */
    if (nodes_size > 0)
      (void) memset((char *) nodes, 0, sizeof(node_t) * nodes_size);
    nodes_used = 1;

    return scanlines(fileno(in), add_mapping, 0, &lineno);
}

/*
 * Routine that deallocates the mapping trie.
 */
void
#ifdef __STDC__
ttf2bdf_free_map(void)
#else
ttf2bdf_free_map()
#endif
{
    if (registry != 0)
      free((char *) registry);
    if (encoding != 0)
      free((char *) encoding);
    registry = encoding = 0;

    if (list.size > 0)
      free((char *) list.field);
    list.size = list.used = 0;

    if (nodes_size > 0)
      free((char *) nodes);
    nodes_size = nodes_used = 0;
}

/*
 * The routine that actually remaps the code by looking it up in the trie.
 */
int
#ifdef __STDC__
ttf2bdf_remap(unsigned short *code)
#else
ttf2bdf_remap(code)
unsigned short *code;
#endif
{
    unsigned long i, n, t;
    unsigned short c, codes[2];

    /*
     * If no mapping table was loaded, then simply return the code.
     */
    if (nodes_used == 0)
      return 1;

    c = *code;
    codes[0] = (c >> 8) & 0xff;
    codes[1] = c & 0xff;

    for (i = n = 0; i < 2; i++) {
        t = nodes[n].kids;
        if (t == 0)
          return 0;
        for (; nodes[t].sibs && nodes[t].key != codes[i]; t = nodes[t].sibs);
        if (nodes[t].key != codes[i])
          return 0;
        n = t;
    }

    *code = nodes[n].val;
    return 1;
}

void
#ifdef __STDC__
ttf2bdf_remap_charset(char **registry_name, char **encoding_name)
#else
ttf2bdf_remap_charset(registry_name, encoding_name)
char **registry_name, **encoding_name;
#endif
{
    if (registry_name != 0)
      *registry_name = registry;
    if (encoding_name != 0)
      *encoding_name = encoding;
}