332 lines
7.3 KiB
C
332 lines
7.3 KiB
C
/*
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Copyright (c) 2003 by Juliusz Chroboczek
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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/* $XFree86: xc/programs/mkfontscale/ident.c,v 1.3tsi Exp $ */
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/* The function identifyBitmap returns -1 if filename is definitively not
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a font file, 1 if it is a single-face bitmap font with a XLFD name,
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and 0 if it should be processed normally. identifyBitmap is
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much faster than parsing the whole font. */
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#include <stdlib.h>
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#include <string.h>
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#include "zlib.h"
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#include "ident.h"
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#define PCF_VERSION (('p'<<24)|('c'<<16)|('f'<<8)|1)
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#define PCF_PROPERTIES (1 << 0)
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typedef struct _Prop {
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unsigned name;
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int isString;
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unsigned value;
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} PropRec, *PropPtr;
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static int pcfIdentify(gzFile f, char **name);
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static int bdfIdentify(gzFile f, char **name);
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static int
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getLSB32(gzFile f)
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{
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int rc;
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unsigned char c[4];
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rc = gzread(f, c, 4);
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if(rc != 4)
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return -1;
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return (c[0]) | (c[1] << 8) | (c[2] << 16) | (c[3] << 24);
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}
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static int
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getInt8(gzFile f, int format)
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{
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unsigned char c;
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int rc;
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rc = gzread(f, &c, 1);
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if(rc != 1)
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return -1;
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return c;
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}
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static int
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getInt32(gzFile f, int format)
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{
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int rc;
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unsigned char c[4];
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rc = gzread(f, c, 4);
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if(rc != 4)
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return -1;
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if(format & (1 << 2)) {
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return (c[0] << 24) | (c[1] << 16) | (c[2] << 8) | (c[3]);
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} else {
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return (c[0]) | (c[1] << 8) | (c[2] << 16) | (c[3] << 24);
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}
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}
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static int
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pcfskip(gzFile f, int n)
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{
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char buf[32];
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int i, rc;
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while(n > 0) {
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i = (n > 32 ? 32 : n);
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rc = gzread(f, buf, i);
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if(rc != i)
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return -1;
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n -= rc;
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}
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return 1;
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}
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int
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bitmapIdentify(char *filename, char **name)
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{
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gzFile f;
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int magic;
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f = gzopen(filename, "rb");
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if(f == NULL)
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return -1;
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magic = getLSB32(f);
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if(magic == PCF_VERSION)
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return pcfIdentify(f, name);
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else if(magic == ('S' | ('T' << 8) | ('A' << 16) | ('R') << 24))
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return bdfIdentify(f, name);
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gzclose(f);
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return 0;
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}
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static int
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pcfIdentify(gzFile f, char **name)
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{
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int prop_position;
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PropPtr props = NULL;
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int format, count, nprops, i, string_size, rc;
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char *strings = NULL, *s;
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count = getLSB32(f);
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if(count <= 0)
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goto fail;
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prop_position = -1;
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for(i = 0; i < count; i++) {
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int type, offset;
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type = getLSB32(f);
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(void) getLSB32(f);
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(void) getLSB32(f);
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offset = getLSB32(f);
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if(type == PCF_PROPERTIES) {
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prop_position = offset;
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break;
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}
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}
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if(prop_position < 0)
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goto fail;
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rc = gzseek(f, prop_position, SEEK_SET);
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if(rc < 0)
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goto fail;
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format = getLSB32(f);
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if((format & 0xFFFFFF00) != 0)
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goto fail;
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nprops = getInt32(f, format);
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if(nprops <= 0 || nprops > 1000)
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goto fail;
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props = malloc(nprops * sizeof(PropRec));
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if(props == NULL)
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goto fail;
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for(i = 0; i < nprops; i++) {
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props[i].name = getInt32(f, format);
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props[i].isString = getInt8(f, format);
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props[i].value = getInt32(f, format);
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}
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if(nprops & 3) {
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rc = pcfskip(f, 4 - (nprops & 3));
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if(rc < 0)
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goto fail;
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}
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string_size = getInt32(f, format);
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if(string_size < 0 || string_size > 100000)
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goto fail;
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strings = malloc(string_size);
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if(!strings)
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goto fail;
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rc = gzread(f, strings, string_size);
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if(rc != string_size)
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goto fail;
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for(i = 0; i < nprops; i++) {
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if(!props[i].isString ||
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props[i].name >= string_size - 4 ||
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props[i].value >= string_size)
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continue;
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if(strcmp(strings + props[i].name, "FONT") == 0)
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break;
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}
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if(i >= nprops)
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goto fail;
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s = malloc(strlen(strings + props[i].value) + 1);
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if(s == NULL)
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goto fail;
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strcpy(s, strings + props[i].value);
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*name = s;
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free(strings);
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free(props);
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gzclose(f);
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return 1;
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fail:
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if(strings) free(strings);
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if(props) free(props);
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gzclose(f);
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return 0;
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}
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#define NKEY 20
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static char*
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getKeyword(gzFile *f, int *eol)
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{
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static char keyword[NKEY + 1];
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int c, i;
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i = 0;
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while(i < NKEY) {
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c = gzgetc(f);
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if(c == ' ' || c == '\n') {
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if(i <= 0)
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return NULL;
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if(eol)
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*eol = (c == '\n');
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keyword[i] = '\0';
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return keyword;
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}
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if(c < 'A' || c > 'Z')
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return NULL;
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keyword[i++] = c;
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}
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return NULL;
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}
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static int
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bdfskip(gzFile *f)
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{
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int c;
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do {
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c = gzgetc(f);
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} while(c >= 0 && c != '\n');
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if(c < 0)
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return -1;
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return 1;
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}
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static char *
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bdfend(gzFile *f)
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{
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int c;
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char *buf = NULL;
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int bufsize = 0;
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int i = 0;
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do {
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c = gzgetc(f);
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} while (c == ' ');
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while(i < 1000) {
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if(c < 0 || (c == '\n' && i == 0)) {
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goto fail;
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}
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if(bufsize < i + 1) {
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char *newbuf;
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if(bufsize == 0) {
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bufsize = 20;
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newbuf = malloc(bufsize);
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} else {
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bufsize = 2 * bufsize;
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newbuf = realloc(buf, bufsize);
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}
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if(newbuf == NULL)
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goto fail;
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buf = newbuf;
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}
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if(c == '\n') {
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buf[i] = '\0';
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return buf;
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}
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buf[i++] = c;
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c = gzgetc(f);
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}
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fail:
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if(buf)
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free(buf);
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return NULL;
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}
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static int
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bdfIdentify(gzFile f, char **name)
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{
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char *k;
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int rc;
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int eol;
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/* bitmapIdentify already read "STAR", so we need to check for
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"TFONT" */
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k = getKeyword(f, &eol);
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if(k == NULL || eol)
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goto fail;
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if(strcmp(k, "TFONT") != 0)
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goto fail;
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while(1) {
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if(!eol) {
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rc = bdfskip(f);
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if(rc < 0)
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goto fail;
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}
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k = getKeyword(f, &eol);
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if(k == NULL)
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goto fail;
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else if(strcmp(k, "FONT") == 0) {
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if(eol)
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goto fail;
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k = bdfend(f);
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if(k == NULL)
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goto fail;
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*name = k;
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gzclose(f);
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return 1;
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} else if(strcmp(k, "CHARS") == 0)
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goto fail;
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}
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fail:
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gzclose(f);
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return 0;
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}
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