diff options
Diffstat (limited to 'src/fontfile/bunzip2.c')
| -rw-r--r-- | src/fontfile/bunzip2.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/src/fontfile/bunzip2.c b/src/fontfile/bunzip2.c new file mode 100644 index 0000000..9964de6 --- /dev/null +++ b/src/fontfile/bunzip2.c @@ -0,0 +1,179 @@ +/* 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 2008 Sun Microsystems, Inc. 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, and/or sell copies of the Software, and to permit persons + * to whom the Software is furnished to do so, provided that the above + * copyright notice(s) and this permission notice appear in all copies of + * the Software and that both the above copyright notice(s) and this + * permission notice appear in supporting documentation. + * + * 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 + * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR + * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL + * INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING + * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, + * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION + * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + * + * Except as contained in this notice, the name of a copyright holder + * shall not be used in advertising or otherwise to promote the sale, use + * or other dealings in this Software without prior written authorization + * of the copyright holder. + */ + + +#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 = (xzip_buf *) xalloc (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) { + xfree(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); + xfree (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; +} |