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89 lines
1.7 KiB
C
89 lines
1.7 KiB
C
/*
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* Copyright (C) 2013 Jan Bobrowski <jb@wizard.ae.krakow.pl>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*/
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#include <string.h>
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#include <stdlib.h>
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#include <zlib.h>
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#include "ttf2woff.h"
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static struct buf get_or_inflate(u8 *p, size_t len, size_t orig_len)
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{
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struct buf buf;
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uLongf blen;
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char *m;
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int v;
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if(len == orig_len) {
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buf.ptr = p;
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buf.len = len;
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return buf;
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}
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buf.len = orig_len;
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buf.ptr = my_alloc(orig_len);
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blen = buf.len;
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v = uncompress(buf.ptr, &blen, p, len);
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switch(v) {
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case Z_OK:
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if(blen==buf.len)
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return buf;
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case Z_MEM_ERROR: m = "BAD_FONT uncompressed length"; break;
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case Z_DATA_ERROR: m = "Data corrupted"; ; break;
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default: m = "Error";
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}
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errx(3, "zlib: %s", m);
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}
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void read_woff(struct ttf *ttf, u8 *data, size_t length)
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{
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u8 *p;
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int i;
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if(length<=44+20) BAD_FONT;
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ttf->flavor = g32(data+4);
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if(g32(data+8) != length) BAD_FONT;
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ttf->ntables = g16(data+12);
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if(!ttf->ntables) BAD_FONT;
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{
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u32 len=g32(data+28), off;
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ttf->woff_meta.len = 0;
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if(len) {
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off = g32(data+24);
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if((off|len)>length || off+len>length)
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BAD_FONT;
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ttf->woff_meta = get_or_inflate(data+off, len, g32(data+32));
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}
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}
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ttf->woff_priv.len = g32(data+40);
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ttf->woff_priv.ptr = ttf->woff_priv.len ? data+g32(data+36) : 0;
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alloc_tables(ttf);
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p = data+44;
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for(i=0; i<ttf->ntables; i++) {
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struct table *t = &ttf->tables[i];
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u32 off=g32(p+4), len=g32(p+8);
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if((off|len)>length || off+len>length)
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BAD_FONT;
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t->tag = g32(p);
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t->csum = g32(p+16);
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t->pos = off;
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t->free_buf = 1;
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t->buf = get_or_inflate(data+off, len, g32(p+12));
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name_table(t);
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p += 20;
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}
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}
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