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-rw-r--r--lib/libstand/gzipfs.c318
1 files changed, 0 insertions, 318 deletions
diff --git a/lib/libstand/gzipfs.c b/lib/libstand/gzipfs.c
deleted file mode 100644
index fb64665cc3a2..000000000000
--- a/lib/libstand/gzipfs.c
+++ /dev/null
@@ -1,318 +0,0 @@
-/*
- * Copyright (c) 1998 Michael Smith.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * $Id: zipfs.c,v 1.2 1998/09/18 22:58:01 msmith Exp $
- *
- */
-
-#include "stand.h"
-
-#include <sys/stat.h>
-#include <string.h>
-#include <zlib.h>
-
-#define Z_BUFSIZE 2048 /* XXX larger? */
-
-struct z_file
-{
- int zf_rawfd;
- z_stream zf_zstream;
- char zf_buf[Z_BUFSIZE];
-};
-
-static int zf_fill(struct z_file *z);
-static int zf_open(const char *path, struct open_file *f);
-static int zf_close(struct open_file *f);
-static int zf_read(struct open_file *f, void *buf, size_t size, size_t *resid);
-static off_t zf_seek(struct open_file *f, off_t offset, int where);
-static int zf_stat(struct open_file *f, struct stat *sb);
-
-struct fs_ops zipfs_fsops = {
- "zip",
- zf_open,
- zf_close,
- zf_read,
- null_write,
- zf_seek,
- zf_stat
-};
-
-#if 0
-void *
-calloc(int items, size_t size)
-{
- return(malloc(items * size));
-}
-#endif
-
-static int
-zf_fill(struct z_file *zf)
-{
- int result;
- int req;
-
- req = Z_BUFSIZE - zf->zf_zstream.avail_in;
- result = 0;
-
- /* If we need more */
- if (req > 0) {
- /* move old data to bottom of buffer */
- if (req < Z_BUFSIZE)
- bcopy(zf->zf_buf + req, zf->zf_buf, Z_BUFSIZE - req);
-
- /* read to fill buffer and update availibility data */
- result = read(zf->zf_rawfd, zf->zf_buf + zf->zf_zstream.avail_in, req);
- zf->zf_zstream.next_in = zf->zf_buf;
- if (result >= 0)
- zf->zf_zstream.avail_in += result;
- }
- return(result);
-}
-
-/*
- * Adapted from get_byte/check_header in libz
- *
- * Returns 0 if the header is OK, nonzero if not.
- */
-static int
-get_byte(struct z_file *zf)
-{
- if ((zf->zf_zstream.avail_in == 0) && (zf_fill(zf) == -1))
- return(-1);
- zf->zf_zstream.avail_in--;
- return(*(zf->zf_zstream.next_in)++);
-}
-
-static int gz_magic[2] = {0x1f, 0x8b}; /* gzip magic header */
-
-/* gzip flag byte */
-#define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */
-#define HEAD_CRC 0x02 /* bit 1 set: header CRC present */
-#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
-#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
-#define COMMENT 0x10 /* bit 4 set: file comment present */
-#define RESERVED 0xE0 /* bits 5..7: reserved */
-
-static int
-check_header(struct z_file *zf)
-{
- int method; /* method byte */
- int flags; /* flags byte */
- uInt len;
- int c;
-
- /* Check the gzip magic header */
- for (len = 0; len < 2; len++) {
- c = get_byte(zf);
- if (c != gz_magic[len]) {
- return(1);
- }
- }
- method = get_byte(zf);
- flags = get_byte(zf);
- if (method != Z_DEFLATED || (flags & RESERVED) != 0) {
- return(1);
- }
-
- /* Discard time, xflags and OS code: */
- for (len = 0; len < 6; len++) (void)get_byte(zf);
-
- if ((flags & EXTRA_FIELD) != 0) { /* skip the extra field */
- len = (uInt)get_byte(zf);
- len += ((uInt)get_byte(zf))<<8;
- /* len is garbage if EOF but the loop below will quit anyway */
- while (len-- != 0 && get_byte(zf) != -1) ;
- }
- if ((flags & ORIG_NAME) != 0) { /* skip the original file name */
- while ((c = get_byte(zf)) != 0 && c != -1) ;
- }
- if ((flags & COMMENT) != 0) { /* skip the .gz file comment */
- while ((c = get_byte(zf)) != 0 && c != -1) ;
- }
- if ((flags & HEAD_CRC) != 0) { /* skip the header crc */
- for (len = 0; len < 2; len++) c = get_byte(zf);
- }
- /* if there's data left, we're in business */
- return((c == -1) ? 1 : 0);
-}
-
-static int
-zf_open(const char *fname, struct open_file *f)
-{
- static char *zfname;
- int rawfd;
- struct z_file *zf;
- char *cp;
- int error;
- struct stat sb;
-
- /* Have to be in "just read it" mode */
- if (f->f_flags != F_READ)
- return(EPERM);
-
- /* If the name already ends in .gz, ignore it */
- if ((cp = strrchr(fname, '.')) && !strcmp(cp, ".gz"))
- return(ENOENT);
-
- /* Construct new name */
- zfname = malloc(strlen(fname) + 4);
- sprintf(zfname, "%s.gz", fname);
-
- /* Try to open the compressed datafile */
- rawfd = open(zfname, O_RDONLY);
- free(zfname);
- if (rawfd == -1)
- return(ENOENT);
-
- if (fstat(rawfd, &sb) < 0) {
- printf("zf_open: stat failed\n");
- close(rawfd);
- return(ENOENT);
- }
- if (!S_ISREG(sb.st_mode)) {
- printf("zf_open: not a file\n");
- close(rawfd);
- return(EISDIR); /* best guess */
- }
-
- /* Allocate a z_file structure, populate it */
- zf = malloc(sizeof(struct z_file));
- bzero(zf, sizeof(struct z_file));
- zf->zf_rawfd = rawfd;
-
- /* Verify that the file is gzipped (XXX why do this afterwards?) */
- if (check_header(zf)) {
- close(zf->zf_rawfd);
- inflateEnd(&(zf->zf_zstream));
- free(zf);
- return(EFTYPE);
- }
-
- /* Initialise the inflation engine */
- if ((error = inflateInit2(&(zf->zf_zstream), -15)) != Z_OK) {
- printf("zf_open: inflateInit returned %d : %s\n", error, zf->zf_zstream.msg);
- close(zf->zf_rawfd);
- free(zf);
- return(EIO);
- }
-
- /* Looks OK, we'll take it */
- f->f_fsdata = zf;
- return(0);
-}
-
-static int
-zf_close(struct open_file *f)
-{
- struct z_file *zf = (struct z_file *)f->f_fsdata;
-
- inflateEnd(&(zf->zf_zstream));
- close(zf->zf_rawfd);
- free(zf);
- return(0);
-}
-
-static int
-zf_read(struct open_file *f, void *buf, size_t size, size_t *resid)
-{
- struct z_file *zf = (struct z_file *)f->f_fsdata;
- int error;
-
- zf->zf_zstream.next_out = buf; /* where and how much */
- zf->zf_zstream.avail_out = size;
-
- while (zf->zf_zstream.avail_out) {
- if ((zf->zf_zstream.avail_in == 0) && (zf_fill(zf) == -1)) {
- printf("zf_read: fill error\n");
- return(-1);
- }
- if (zf->zf_zstream.avail_in == 0) { /* oops, unexpected EOF */
- printf("zf_read: unexpected EOF\n");
- break;
- }
-
- error = inflate(&zf->zf_zstream, Z_SYNC_FLUSH); /* decompression pass */
- if (error == Z_STREAM_END) { /* EOF, all done */
- break;
- }
- if (error != Z_OK) { /* argh, decompression error */
- printf("inflate: %s\n", zf->zf_zstream.msg);
- errno = EIO;
- return(-1);
- }
- }
- if (resid != NULL)
- *resid = zf->zf_zstream.avail_out;
- return(0);
-}
-
-static off_t
-zf_seek(struct open_file *f, off_t offset, int where)
-{
- struct z_file *zf = (struct z_file *)f->f_fsdata;
- off_t target;
- char discard[16];
-
- switch (where) {
- case SEEK_SET:
- target = offset;
- break;
- case SEEK_CUR:
- target = offset + zf->zf_zstream.total_out;
- break;
- default:
- target = -1;
- }
-
- /* Can we get there from here? */
- if (target < zf->zf_zstream.total_out) {
- errno = EOFFSET;
- return -1;
- }
-
- /* skip forwards if required */
- while (target > zf->zf_zstream.total_out) {
- if (zf_read(f, discard, min(sizeof(discard), target - zf->zf_zstream.total_out), NULL) == -1)
- return(-1);
- }
- /* This is where we are (be honest if we overshot) */
- return (zf->zf_zstream.total_out);
-}
-
-
-static int
-zf_stat(struct open_file *f, struct stat *sb)
-{
- struct z_file *zf = (struct z_file *)f->f_fsdata;
- int result;
-
- /* stat as normal, but indicate that size is unknown */
- if ((result = fstat(zf->zf_rawfd, sb)) == 0)
- sb->st_size = -1;
- return(result);
-}
-
-
-
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