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