fontconfig/fc-glyphname/fc-glyphname.c

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/*
2008-08-13 09:30:23 +02:00
* fontconfig/fc-glyphname/fc-glyphname.c
*
2004-12-07 02:14:46 +01:00
* Copyright © 2003 Keith Packard
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of the author(s) not be used in
* advertising or publicity pertaining to distribution of the software without
* specific, written prior permission. The authors make no
* representations about the suitability of this software for any purpose. It
* is provided "as is" without express or implied warranty.
*
* THE AUTHOR(S) DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#include "fcint.h"
static int
rawindex (const FcGlyphName *gn);
static void
scan (FILE *f, char *filename);
static int
isprime (int i);
static void
find_hash (void);
static FcChar32
FcHashGlyphName (const FcChar8 *name);
static void
insert (FcGlyphName *gn, FcGlyphName **table, FcChar32 h);
static void
dump (FcGlyphName * const *table, const char *name);
static FcGlyphName *
FcAllocGlyphName (FcChar32 ucs, FcChar8 *name)
{
FcGlyphName *gn;
gn = malloc (sizeof (FcGlyphName) + strlen ((char *) name));
if (!gn)
return 0;
gn->ucs = ucs;
strcpy ((char *) gn->name, (char *) name);
return gn;
}
static void
fatal (const char *file, int lineno, const char *msg)
{
if (lineno)
fprintf (stderr, "%s:%d: %s\n", file, lineno, msg);
else
fprintf (stderr, "%s: %s\n", file, msg);
exit (1);
}
#define MAX_GLYPHFILE 256
#define MAX_GLYPHNAME 10240
#define MAX_NAMELEN 1024
static FcGlyphName *raw[MAX_GLYPHNAME];
static int nraw;
static int max_name_len;
static FcGlyphName *name_to_ucs[MAX_GLYPHNAME*2];
static FcGlyphName *ucs_to_name[MAX_GLYPHNAME*2];
static unsigned int hash, rehash;
static int
rawindex (const FcGlyphName *gn)
{
int i;
for (i = 0; i < nraw; i++)
if (raw[i] == gn)
return i;
return -1;
}
static void
scan (FILE *f, char *filename)
{
char buf[MAX_NAMELEN];
char name[MAX_NAMELEN];
unsigned long ucs;
FcGlyphName *gn;
int lineno = 0;
int len;
while (fgets (buf, sizeof (buf), f))
{
lineno++;
if (sscanf (buf, "%[^;];%lx\n", name, &ucs) != 2)
continue;
gn = FcAllocGlyphName ((FcChar32) ucs, (FcChar8 *) name);
if (!gn)
fatal (filename, lineno, "out of memory");
len = strlen (name);
if (len > max_name_len)
max_name_len = len;
raw[nraw++] = gn;
}
}
static int compare_string (const void *a, const void *b)
{
const char *const *as = a, *const *bs = b;
return strcmp (*as, *bs);
}
static int compare_glyphname (const void *a, const void *b)
{
const FcGlyphName *const *ag = a, *const *bg = b;
return strcmp ((char *) (*ag)->name, (char *) (*bg)->name);
}
static int
isqrt (int a)
{
int l, h, m;
l = 2;
h = a/2;
while ((h-l) > 1)
{
m = (h+l) >> 1;
if (m * m < a)
l = m;
else
h = m;
}
return h;
}
static int
isprime (int i)
{
int l, t;
if (i < 2)
return FcFalse;
if ((i & 1) == 0)
{
if (i == 2)
return FcTrue;
return FcFalse;
}
l = isqrt (i) + 1;
for (t = 3; t <= l; t += 2)
if (i % t == 0)
return 0;
return 1;
}
/*
* Find a prime pair that leaves at least 25% of the hash table empty
*/
static void
find_hash (void)
{
int h;
h = nraw + nraw / 4;
if ((h & 1) == 0)
h++;
while (!isprime(h-2) || !isprime(h))
h += 2;
hash = h;
rehash = h-2;
}
static FcChar32
FcHashGlyphName (const FcChar8 *name)
{
FcChar32 h = 0;
FcChar8 c;
while ((c = *name++))
{
h = ((h << 1) | (h >> 31)) ^ c;
}
return h;
}
static void
insert (FcGlyphName *gn, FcGlyphName **table, FcChar32 h)
{
int i, r = 0;
i = (int) (h % hash);
while (table[i])
{
if (!r) r = (int) (h % rehash + 1);
i += r;
if (i >= hash)
i -= hash;
}
table[i] = gn;
}
static void
dump (FcGlyphName * const *table, const char *name)
{
int i;
printf ("static const FcGlyphId %s[%d] = {\n", name, hash);
for (i = 0; i < hash; i++)
if (table[i])
printf (" %d,\n", rawindex(table[i]));
else
printf (" -1,\n");
printf ("};\n");
}
int
main (int argc, char **argv)
{
char *files[MAX_GLYPHFILE];
char line[1024];
FILE *f;
int i;
char *type;
i = 0;
while (argv[i+1])
{
if (i == MAX_GLYPHFILE)
fatal (*argv, 0, "Too many glyphname files");
files[i] = argv[i+1];
i++;
}
files[i] = 0;
qsort (files, i, sizeof (char *), compare_string);
for (i = 0; files[i]; i++)
{
f = fopen (files[i], "r");
if (!f)
fatal (files[i], 0, strerror (errno));
scan (f, files[i]);
fclose (f);
}
qsort (raw, nraw, sizeof (FcGlyphName *), compare_glyphname);
find_hash ();
for (i = 0; i < nraw; i++)
{
insert (raw[i], name_to_ucs, FcHashGlyphName (raw[i]->name));
insert (raw[i], ucs_to_name, raw[i]->ucs);
}
/*
* Scan the input until the marker is found
*/
while (fgets (line, sizeof (line), stdin))
{
if (!strncmp (line, "@@@", 3))
break;
fputs (line, stdout);
}
printf ("/* %d glyphnames in %d entries, %d%% occupancy */\n\n",
nraw, hash, nraw * 100 / hash);
printf ("#define FC_GLYPHNAME_HASH %u\n", hash);
printf ("#define FC_GLYPHNAME_REHASH %u\n", rehash);
printf ("#define FC_GLYPHNAME_MAXLEN %d\n\n", max_name_len);
if (nraw < 128)
type = "int8_t";
else if (nraw < 32768)
type = "int16_t";
else
type = "int32_t";
printf ("typedef %s FcGlyphId;\n\n", type);
/*
* Dump out entries
*/
printf ("static const struct { const FcChar32 ucs; const FcChar8 name[%d]; } _fc_glyph_names[%d] = {\n",
max_name_len + 1, nraw);
for (i = 0; i < nraw; i++)
printf (" { 0x%lx, \"%s\" },\n",
(unsigned long) raw[i]->ucs, raw[i]->name);
printf ("};\n");
/*
* Dump out name_to_ucs table
*/
dump (name_to_ucs, "_fc_name_to_ucs");
/*
* Dump out ucs_to_name table
*/
dump (ucs_to_name, "_fc_ucs_to_name");
while (fgets (line, sizeof (line), stdin))
fputs (line, stdout);
fflush (stdout);
exit (ferror (stdout));
}