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96 lines
2.1 KiB
C
96 lines
2.1 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 <assert.h>
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#include "ttf2woff.h"
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#define MIN_COMPR 16
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void gen_woff(struct buf *out, struct ttf *ttf)
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{
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unsigned woff_size, sfnt_size;
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struct buf meta_comp={0};
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u32 meta_off, priv_off;
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u8 *buf, *p;
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int i;
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woff_size = 44 + 20*ttf->ntables;
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sfnt_size = 12 + 16*ttf->ntables;
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for(i=0; i<ttf->ntables; i++) {
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struct table *t = ttf->tab_pos[i];
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t->pos = woff_size; // remember offset in output file
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t->zbuf = t->buf;
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if(t->buf.len >= MIN_COMPR)
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zlib_compress(&t->zbuf, &t->buf);
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sfnt_size += t->buf.len+3 & ~3;
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woff_size += t->zbuf.len+3 & ~3;
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}
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meta_off = 0;
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if(ttf->woff_meta.len >= MIN_COMPR) {
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meta_comp = ttf->woff_meta;
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zlib_compress(&meta_comp, &ttf->woff_meta);
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meta_off = woff_size;
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woff_size += meta_comp.len;
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}
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priv_off = 0;
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if(ttf->woff_priv.len) {
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priv_off = woff_size;
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woff_size += ttf->woff_priv.len;
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}
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buf = my_alloc(woff_size);
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p32(buf, 0x774F4646);
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p32(buf+4, ttf->flavor);
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p32(buf+8, woff_size);
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p16(buf+12, ttf->ntables);
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p16(buf+14, 0);
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p32(buf+16, sfnt_size);
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p32(buf+20, 0); // version ?
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p32(buf+24, meta_off);
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p32(buf+28, meta_comp.len); // meta len
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p32(buf+32, ttf->woff_meta.len); // meta orig len
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p32(buf+36, priv_off);
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p32(buf+40, ttf->woff_priv.len);
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p = buf + 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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p32(p, t->tag);
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p32(p+4, t->pos);
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p32(p+8, t->zbuf.len);
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p32(p+12, t->buf.len);
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p32(p+16, t->csum);
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p += 20;
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}
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for(i=0; i<ttf->ntables; i++) {
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struct table *t = ttf->tab_pos[i];
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u32 sz = t->zbuf.len;
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p = append(p, t->zbuf.ptr, sz);
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while(sz&3) *p++=0, sz++;
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// if(t->zbuf.ptr != t->buf.ptr)
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// my_free(t->zbuf.ptr);
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}
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if(meta_comp.len)
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p = append(p, meta_comp.ptr, meta_comp.len);
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if(ttf->woff_priv.len)
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p = append(p, ttf->woff_priv.ptr, ttf->woff_priv.len);
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assert(p == buf+woff_size);
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out->ptr = buf;
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out->len = woff_size;
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}
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