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/* Based on src/fontfile/gunzip.c
written by Mark Eichin <eichin@kitten.gen.ma.us> September 1996.
intended for inclusion in X11 public releases. */
/*
* Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include "config.h"
#include <X11/fonts/fontmisc.h>
#include <X11/fonts/bufio.h>
#include <bzlib.h>
typedef struct _xzip_buf {
bz_stream z;
int zstat;
BufChar b[BUFFILESIZE];
BufChar b_in[BUFFILESIZE];
BufFilePtr f;
} xzip_buf;
static int BufBzip2FileClose ( BufFilePtr f, int flag );
static int BufBzip2FileFill ( BufFilePtr f );
static int BufBzip2FileSkip ( BufFilePtr f, int c );
_X_HIDDEN BufFilePtr
BufFilePushBZIP2 (BufFilePtr f)
{
xzip_buf *x;
x = malloc (sizeof (xzip_buf));
if (!x) return NULL;
bzero(&(x->z), sizeof(bz_stream));
x->f = f;
x->zstat = BZ2_bzDecompressInit(&(x->z),
0, /* verbosity: 0 silent, 4 max */
0); /* 0: go faster, 1: use less memory */
if (x->zstat != BZ_OK) {
free(x);
return NULL;
}
/* now that the history buffer is allocated, we provide the data buffer */
x->z.next_out = (char *) x->b;
x->z.avail_out = BUFFILESIZE;
x->z.next_in = (char *) x->b_in;
x->z.avail_in = 0;
return BufFileCreate((char *)x,
BufBzip2FileFill,
NULL,
BufBzip2FileSkip,
BufBzip2FileClose);
}
static int
BufBzip2FileClose(BufFilePtr f, int flag)
{
xzip_buf *x = (xzip_buf *)f->private;
BZ2_bzDecompressEnd (&(x->z));
BufFileClose (x->f, flag);
free (x);
return 1;
}
/* here's the real work.
-- we need to put stuff in f.buffer, update f.left and f.bufp,
then return the first byte (or BUFFILEEOF).
-- to do this, we need to get stuff into avail_in, and next_in,
and call BZ2_bzDecompress appropriately.
-- we may also need to add CRC maintenance - if BZ2_bzDecompress tells us
BZ_STREAM_END, we then have 4bytes CRC and 4bytes length...
*/
static int
BufBzip2FileFill (BufFilePtr f)
{
xzip_buf *x = (xzip_buf *)f->private;
/* we only get called when left == 0... */
/* but just in case, deal */
if (f->left >= 0) {
f->left--;
return *(f->bufp++);
}
/* did we run out last time? */
switch (x->zstat) {
case BZ_OK:
break;
case BZ_STREAM_END:
case BZ_DATA_ERROR:
case BZ_DATA_ERROR_MAGIC:
f->left = 0;
return BUFFILEEOF;
default:
return BUFFILEEOF;
}
/* now we work to consume what we can */
/* let libbz2 know what we can handle */
x->z.next_out = (char *) x->b;
x->z.avail_out = BUFFILESIZE;
/* and try to consume all of it */
while (x->z.avail_out > 0) {
/* if we don't have anything to work from... */
if (x->z.avail_in == 0) {
/* ... fill the z buf from underlying file */
int i, c;
for (i = 0; i < sizeof(x->b_in); i++) {
c = BufFileGet(x->f);
if (c == BUFFILEEOF) break;
x->b_in[i] = c;
}
x->z.avail_in += i;
x->z.next_in = (char *) x->b_in;
}
/* so now we have some output space and some input data */
x->zstat = BZ2_bzDecompress(&(x->z));
/* the inflation output happens in the f buffer directly... */
if (x->zstat == BZ_STREAM_END) {
/* deal with EOF, crc */
break;
}
if (x->zstat != BZ_OK) {
break;
}
}
f->bufp = x->b;
f->left = BUFFILESIZE - x->z.avail_out;
if (f->left >= 0) {
f->left--;
return *(f->bufp++);
} else {
return BUFFILEEOF;
}
}
/* there should be a BufCommonSkip... */
static int
BufBzip2FileSkip (BufFilePtr f, int c)
{
/* BufFileRawSkip returns the count unchanged.
BufCompressedSkip returns 0.
That means it probably never gets called... */
int retval = c;
while(c--) {
int get = BufFileGet(f);
if (get == BUFFILEEOF) return get;
}
return retval;
}
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