lib/libstand/bzipfs.c

199767f8919635c4928607450d9e0abb932109ceToomas Soome/*
199767f8919635c4928607450d9e0abb932109ceToomas Soome * Copyright (c) 1998 Michael Smith.
199767f8919635c4928607450d9e0abb932109ceToomas Soome * Copyright (c) 2000 Maxim Sobolev
199767f8919635c4928607450d9e0abb932109ceToomas Soome * All rights reserved.
199767f8919635c4928607450d9e0abb932109ceToomas Soome *
199767f8919635c4928607450d9e0abb932109ceToomas Soome * Redistribution and use in source and binary forms, with or without
199767f8919635c4928607450d9e0abb932109ceToomas Soome * modification, are permitted provided that the following conditions
199767f8919635c4928607450d9e0abb932109ceToomas Soome * are met:
199767f8919635c4928607450d9e0abb932109ceToomas Soome * 1. Redistributions of source code must retain the above copyright
199767f8919635c4928607450d9e0abb932109ceToomas Soome *    notice, this list of conditions and the following disclaimer.
199767f8919635c4928607450d9e0abb932109ceToomas Soome * 2. Redistributions in binary form must reproduce the above copyright
199767f8919635c4928607450d9e0abb932109ceToomas Soome *    notice, this list of conditions and the following disclaimer in the
199767f8919635c4928607450d9e0abb932109ceToomas Soome *    documentation and/or other materials provided with the distribution.
199767f8919635c4928607450d9e0abb932109ceToomas Soome *
199767f8919635c4928607450d9e0abb932109ceToomas Soome * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
199767f8919635c4928607450d9e0abb932109ceToomas Soome * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
199767f8919635c4928607450d9e0abb932109ceToomas Soome * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
199767f8919635c4928607450d9e0abb932109ceToomas Soome * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
199767f8919635c4928607450d9e0abb932109ceToomas Soome * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
199767f8919635c4928607450d9e0abb932109ceToomas Soome * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
199767f8919635c4928607450d9e0abb932109ceToomas Soome * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
199767f8919635c4928607450d9e0abb932109ceToomas Soome * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
199767f8919635c4928607450d9e0abb932109ceToomas Soome * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
199767f8919635c4928607450d9e0abb932109ceToomas Soome * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
199767f8919635c4928607450d9e0abb932109ceToomas Soome * SUCH DAMAGE.
199767f8919635c4928607450d9e0abb932109ceToomas Soome */
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome#include <sys/cdefs.h>
199767f8919635c4928607450d9e0abb932109ceToomas Soome__FBSDID("$FreeBSD$");
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome#ifndef REGRESSION
199767f8919635c4928607450d9e0abb932109ceToomas Soome#include "stand.h"
199767f8919635c4928607450d9e0abb932109ceToomas Soome#else
199767f8919635c4928607450d9e0abb932109ceToomas Soome#include <stdlib.h>
199767f8919635c4928607450d9e0abb932109ceToomas Soome#include <sys/errno.h>
199767f8919635c4928607450d9e0abb932109ceToomas Soome#include <sys/fcntl.h>
199767f8919635c4928607450d9e0abb932109ceToomas Soome#include <sys/types.h>
199767f8919635c4928607450d9e0abb932109ceToomas Soome#include <sys/unistd.h>
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soomestruct open_file {
199767f8919635c4928607450d9e0abb932109ceToomas Soome    int                 f_flags;        /* see F_* below */
199767f8919635c4928607450d9e0abb932109ceToomas Soome    void                *f_fsdata;      /* file system specific data */
199767f8919635c4928607450d9e0abb932109ceToomas Soome};
199767f8919635c4928607450d9e0abb932109ceToomas Soome#define F_READ          0x0001  /* file opened for reading */
199767f8919635c4928607450d9e0abb932109ceToomas Soome#define EOFFSET (ELAST+8)       /* relative seek not supported */
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic inline u_int min(u_int a, u_int b) { return(a < b ? a : b); }
199767f8919635c4928607450d9e0abb932109ceToomas Soome#define panic(x, y) abort()
199767f8919635c4928607450d9e0abb932109ceToomas Soome#endif
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome#include <sys/stat.h>
199767f8919635c4928607450d9e0abb932109ceToomas Soome#include <string.h>
199767f8919635c4928607450d9e0abb932109ceToomas Soome#include <bzlib.h>
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome#define BZ_BUFSIZE 2048 /* XXX larger? */
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soomestruct bz_file
199767f8919635c4928607450d9e0abb932109ceToomas Soome{
199767f8919635c4928607450d9e0abb932109ceToomas Soome    int         bzf_rawfd;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    bz_stream       bzf_bzstream;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    char        bzf_buf[BZ_BUFSIZE];
199767f8919635c4928607450d9e0abb932109ceToomas Soome    int         bzf_endseen;
199767f8919635c4928607450d9e0abb932109ceToomas Soome};
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic int  bzf_fill(struct bz_file *z);
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic int  bzf_open(const char *path, struct open_file *f);
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic int  bzf_close(struct open_file *f);
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic int  bzf_read(struct open_file *f, void *buf, size_t size, size_t *resid);
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic off_t    bzf_seek(struct open_file *f, off_t offset, int where);
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic int  bzf_stat(struct open_file *f, struct stat *sb);
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome#ifndef REGRESSION
199767f8919635c4928607450d9e0abb932109ceToomas Soomestruct fs_ops bzipfs_fsops = {
199767f8919635c4928607450d9e0abb932109ceToomas Soome    "bzip",
199767f8919635c4928607450d9e0abb932109ceToomas Soome    bzf_open,
199767f8919635c4928607450d9e0abb932109ceToomas Soome    bzf_close,
199767f8919635c4928607450d9e0abb932109ceToomas Soome    bzf_read,
199767f8919635c4928607450d9e0abb932109ceToomas Soome    null_write,
199767f8919635c4928607450d9e0abb932109ceToomas Soome    bzf_seek,
199767f8919635c4928607450d9e0abb932109ceToomas Soome    bzf_stat,
199767f8919635c4928607450d9e0abb932109ceToomas Soome    null_readdir
199767f8919635c4928607450d9e0abb932109ceToomas Soome};
199767f8919635c4928607450d9e0abb932109ceToomas Soome#endif
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic int
199767f8919635c4928607450d9e0abb932109ceToomas Soomebzf_fill(struct bz_file *bzf)
199767f8919635c4928607450d9e0abb932109ceToomas Soome{
199767f8919635c4928607450d9e0abb932109ceToomas Soome    int     result;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    int     req;
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    req = BZ_BUFSIZE - bzf->bzf_bzstream.avail_in;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    result = 0;
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    /* If we need more */
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if (req > 0) {
199767f8919635c4928607450d9e0abb932109ceToomas Soome    /* move old data to bottom of buffer */
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if (req < BZ_BUFSIZE)
199767f8919635c4928607450d9e0abb932109ceToomas Soome        bcopy(bzf->bzf_buf + req, bzf->bzf_buf, BZ_BUFSIZE - req);
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    /* read to fill buffer and update availibility data */
199767f8919635c4928607450d9e0abb932109ceToomas Soome    result = read(bzf->bzf_rawfd, bzf->bzf_buf + bzf->bzf_bzstream.avail_in, req);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    bzf->bzf_bzstream.next_in = bzf->bzf_buf;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if (result >= 0)
199767f8919635c4928607450d9e0abb932109ceToomas Soome        bzf->bzf_bzstream.avail_in += result;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    }
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return(result);
199767f8919635c4928607450d9e0abb932109ceToomas Soome}
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome/*
199767f8919635c4928607450d9e0abb932109ceToomas Soome * Adapted from get_byte/check_header in libz
199767f8919635c4928607450d9e0abb932109ceToomas Soome *
199767f8919635c4928607450d9e0abb932109ceToomas Soome * Returns 0 if the header is OK, nonzero if not.
199767f8919635c4928607450d9e0abb932109ceToomas Soome */
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic int
199767f8919635c4928607450d9e0abb932109ceToomas Soomeget_byte(struct bz_file *bzf)
199767f8919635c4928607450d9e0abb932109ceToomas Soome{
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if ((bzf->bzf_bzstream.avail_in == 0) && (bzf_fill(bzf) == -1))
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return(-1);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    bzf->bzf_bzstream.avail_in--;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return(*(bzf->bzf_bzstream.next_in)++);
199767f8919635c4928607450d9e0abb932109ceToomas Soome}
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic int bz_magic[3] = {'B', 'Z', 'h'}; /* bzip2 magic header */
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic int
199767f8919635c4928607450d9e0abb932109ceToomas Soomecheck_header(struct bz_file *bzf)
199767f8919635c4928607450d9e0abb932109ceToomas Soome{
199767f8919635c4928607450d9e0abb932109ceToomas Soome    unsigned int len;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    int      c;
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    /* Check the bzip2 magic header */
199767f8919635c4928607450d9e0abb932109ceToomas Soome    for (len = 0; len < 3; len++) {
199767f8919635c4928607450d9e0abb932109ceToomas Soome    c = get_byte(bzf);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if (c != bz_magic[len]) {
199767f8919635c4928607450d9e0abb932109ceToomas Soome        return(1);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    }
199767f8919635c4928607450d9e0abb932109ceToomas Soome    }
199767f8919635c4928607450d9e0abb932109ceToomas Soome    /* Check that the block size is valid */
199767f8919635c4928607450d9e0abb932109ceToomas Soome    c = get_byte(bzf);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if (c < '1' || c > '9')
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return(1);
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    /* Put back bytes that we've took from the input stream */
199767f8919635c4928607450d9e0abb932109ceToomas Soome    bzf->bzf_bzstream.next_in -= 4;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    bzf->bzf_bzstream.avail_in += 4;
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return(0);
199767f8919635c4928607450d9e0abb932109ceToomas Soome}
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic int
199767f8919635c4928607450d9e0abb932109ceToomas Soomebzf_open(const char *fname, struct open_file *f)
199767f8919635c4928607450d9e0abb932109ceToomas Soome{
199767f8919635c4928607450d9e0abb932109ceToomas Soome    static char     *bzfname;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    int         rawfd;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    struct bz_file  *bzf;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    char        *cp;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    int         error;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    struct stat     sb;
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    /* Have to be in "just read it" mode */
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if (f->f_flags != F_READ)
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return(EPERM);
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    /* If the name already ends in .gz or .bz2, ignore it */
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if ((cp = strrchr(fname, '.')) && (!strcmp(cp, ".gz")
199767f8919635c4928607450d9e0abb932109ceToomas Soome        || !strcmp(cp, ".bz2") || !strcmp(cp, ".split")))
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return(ENOENT);
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    /* Construct new name */
199767f8919635c4928607450d9e0abb932109ceToomas Soome    bzfname = malloc(strlen(fname) + 5);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if (bzfname == NULL)
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return(ENOMEM);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    sprintf(bzfname, "%s.bz2", fname);
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    /* Try to open the compressed datafile */
199767f8919635c4928607450d9e0abb932109ceToomas Soome    rawfd = open(bzfname, O_RDONLY);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    free(bzfname);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if (rawfd == -1)
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return(ENOENT);
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if (fstat(rawfd, &sb) < 0) {
199767f8919635c4928607450d9e0abb932109ceToomas Soome    printf("bzf_open: stat failed\n");
199767f8919635c4928607450d9e0abb932109ceToomas Soome    close(rawfd);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return(ENOENT);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    }
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if (!S_ISREG(sb.st_mode)) {
199767f8919635c4928607450d9e0abb932109ceToomas Soome    printf("bzf_open: not a file\n");
199767f8919635c4928607450d9e0abb932109ceToomas Soome    close(rawfd);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return(EISDIR);         /* best guess */
199767f8919635c4928607450d9e0abb932109ceToomas Soome    }
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    /* Allocate a bz_file structure, populate it */
199767f8919635c4928607450d9e0abb932109ceToomas Soome    bzf = malloc(sizeof(struct bz_file));
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if (bzf == NULL)
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return(ENOMEM);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    bzero(bzf, sizeof(struct bz_file));
199767f8919635c4928607450d9e0abb932109ceToomas Soome    bzf->bzf_rawfd = rawfd;
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    /* Verify that the file is bzipped */
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if (check_header(bzf)) {
199767f8919635c4928607450d9e0abb932109ceToomas Soome    close(bzf->bzf_rawfd);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    free(bzf);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return(EFTYPE);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    }
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    /* Initialise the inflation engine */
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if ((error = BZ2_bzDecompressInit(&(bzf->bzf_bzstream), 0, 1)) != BZ_OK) {
199767f8919635c4928607450d9e0abb932109ceToomas Soome    printf("bzf_open: BZ2_bzDecompressInit returned %d\n", error);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    close(bzf->bzf_rawfd);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    free(bzf);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return(EIO);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    }
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    /* Looks OK, we'll take it */
199767f8919635c4928607450d9e0abb932109ceToomas Soome    f->f_fsdata = bzf;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return(0);
199767f8919635c4928607450d9e0abb932109ceToomas Soome}
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic int
199767f8919635c4928607450d9e0abb932109ceToomas Soomebzf_close(struct open_file *f)
199767f8919635c4928607450d9e0abb932109ceToomas Soome{
199767f8919635c4928607450d9e0abb932109ceToomas Soome    struct bz_file  *bzf = (struct bz_file *)f->f_fsdata;
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    BZ2_bzDecompressEnd(&(bzf->bzf_bzstream));
199767f8919635c4928607450d9e0abb932109ceToomas Soome    close(bzf->bzf_rawfd);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    free(bzf);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return(0);
199767f8919635c4928607450d9e0abb932109ceToomas Soome}
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic int
199767f8919635c4928607450d9e0abb932109ceToomas Soomebzf_read(struct open_file *f, void *buf, size_t size, size_t *resid)
199767f8919635c4928607450d9e0abb932109ceToomas Soome{
199767f8919635c4928607450d9e0abb932109ceToomas Soome    struct bz_file  *bzf = (struct bz_file *)f->f_fsdata;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    int         error;
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    bzf->bzf_bzstream.next_out = buf;           /* where and how much */
199767f8919635c4928607450d9e0abb932109ceToomas Soome    bzf->bzf_bzstream.avail_out = size;
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    while (bzf->bzf_bzstream.avail_out && bzf->bzf_endseen == 0) {
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if ((bzf->bzf_bzstream.avail_in == 0) && (bzf_fill(bzf) == -1)) {
199767f8919635c4928607450d9e0abb932109ceToomas Soome        printf("bzf_read: fill error\n");
199767f8919635c4928607450d9e0abb932109ceToomas Soome        return(EIO);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    }
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if (bzf->bzf_bzstream.avail_in == 0) {      /* oops, unexpected EOF */
199767f8919635c4928607450d9e0abb932109ceToomas Soome        printf("bzf_read: unexpected EOF\n");
199767f8919635c4928607450d9e0abb932109ceToomas Soome        if (bzf->bzf_bzstream.avail_out == size)
199767f8919635c4928607450d9e0abb932109ceToomas Soome        return(EIO);
199767f8919635c4928607450d9e0abb932109ceToomas Soome        break;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    }
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    error = BZ2_bzDecompress(&bzf->bzf_bzstream);   /* decompression pass */
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if (error == BZ_STREAM_END) {           /* EOF, all done */
199767f8919635c4928607450d9e0abb932109ceToomas Soome        bzf->bzf_endseen = 1;
199767f8919635c4928607450d9e0abb932109ceToomas Soome        break;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    }
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if (error != BZ_OK) {               /* argh, decompression error */
199767f8919635c4928607450d9e0abb932109ceToomas Soome        printf("bzf_read: BZ2_bzDecompress returned %d\n", error);
199767f8919635c4928607450d9e0abb932109ceToomas Soome        return(EIO);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    }
199767f8919635c4928607450d9e0abb932109ceToomas Soome    }
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if (resid != NULL)
199767f8919635c4928607450d9e0abb932109ceToomas Soome    *resid = bzf->bzf_bzstream.avail_out;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return(0);
199767f8919635c4928607450d9e0abb932109ceToomas Soome}
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic int
199767f8919635c4928607450d9e0abb932109ceToomas Soomebzf_rewind(struct open_file *f)
199767f8919635c4928607450d9e0abb932109ceToomas Soome{
199767f8919635c4928607450d9e0abb932109ceToomas Soome    struct bz_file  *bzf = (struct bz_file *)f->f_fsdata;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    struct bz_file  *bzf_tmp;
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    /*
199767f8919635c4928607450d9e0abb932109ceToomas Soome     * Since bzip2 does not have an equivalent inflateReset function a crude
199767f8919635c4928607450d9e0abb932109ceToomas Soome     * one needs to be provided.  The functions all called in such a way that
199767f8919635c4928607450d9e0abb932109ceToomas Soome     * at any time an error occurs a roll back can be done (effectively making
199767f8919635c4928607450d9e0abb932109ceToomas Soome     * this rewind 'atomic', either the reset occurs successfully or not at all,
199767f8919635c4928607450d9e0abb932109ceToomas Soome     * with no 'undefined' state happening).
199767f8919635c4928607450d9e0abb932109ceToomas Soome     */
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    /* Allocate a bz_file structure, populate it */
199767f8919635c4928607450d9e0abb932109ceToomas Soome    bzf_tmp = malloc(sizeof(struct bz_file));
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if (bzf_tmp == NULL)
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return(-1);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    bzero(bzf_tmp, sizeof(struct bz_file));
199767f8919635c4928607450d9e0abb932109ceToomas Soome    bzf_tmp->bzf_rawfd = bzf->bzf_rawfd;
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    /* Initialise the inflation engine */
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if (BZ2_bzDecompressInit(&(bzf_tmp->bzf_bzstream), 0, 1) != BZ_OK) {
199767f8919635c4928607450d9e0abb932109ceToomas Soome    free(bzf_tmp);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return(-1);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    }
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    /* Seek back to the beginning of the file */
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if (lseek(bzf->bzf_rawfd, 0, SEEK_SET) == -1) {
199767f8919635c4928607450d9e0abb932109ceToomas Soome    BZ2_bzDecompressEnd(&(bzf_tmp->bzf_bzstream));
199767f8919635c4928607450d9e0abb932109ceToomas Soome    free(bzf_tmp);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return(-1);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    }
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    /* Free old bz_file data */
199767f8919635c4928607450d9e0abb932109ceToomas Soome    BZ2_bzDecompressEnd(&(bzf->bzf_bzstream));
199767f8919635c4928607450d9e0abb932109ceToomas Soome    free(bzf);
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    /* Use the new bz_file data */
199767f8919635c4928607450d9e0abb932109ceToomas Soome    f->f_fsdata = bzf_tmp;
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return(0);
199767f8919635c4928607450d9e0abb932109ceToomas Soome}
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic off_t
199767f8919635c4928607450d9e0abb932109ceToomas Soomebzf_seek(struct open_file *f, off_t offset, int where)
199767f8919635c4928607450d9e0abb932109ceToomas Soome{
199767f8919635c4928607450d9e0abb932109ceToomas Soome    struct bz_file  *bzf = (struct bz_file *)f->f_fsdata;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    off_t       target;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    char        discard[16];
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    switch (where) {
199767f8919635c4928607450d9e0abb932109ceToomas Soome    case SEEK_SET:
199767f8919635c4928607450d9e0abb932109ceToomas Soome    target = offset;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    break;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    case SEEK_CUR:
199767f8919635c4928607450d9e0abb932109ceToomas Soome    target = offset + bzf->bzf_bzstream.total_out_lo32;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    break;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    case SEEK_END:
199767f8919635c4928607450d9e0abb932109ceToomas Soome    target = -1;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    default:
199767f8919635c4928607450d9e0abb932109ceToomas Soome    errno = EINVAL;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return(-1);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    }
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    /* Can we get there from here? */
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if (target < bzf->bzf_bzstream.total_out_lo32 && bzf_rewind(f) != 0) {
199767f8919635c4928607450d9e0abb932109ceToomas Soome    errno = EOFFSET;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return -1;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    }
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    /* if bzf_rewind was called then bzf has changed */
199767f8919635c4928607450d9e0abb932109ceToomas Soome    bzf = (struct bz_file *)f->f_fsdata;
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    /* skip forwards if required */
199767f8919635c4928607450d9e0abb932109ceToomas Soome    while (target > bzf->bzf_bzstream.total_out_lo32) {
199767f8919635c4928607450d9e0abb932109ceToomas Soome    errno = bzf_read(f, discard, min(sizeof(discard),
199767f8919635c4928607450d9e0abb932109ceToomas Soome        target - bzf->bzf_bzstream.total_out_lo32), NULL);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if (errno)
199767f8919635c4928607450d9e0abb932109ceToomas Soome        return(-1);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    }
199767f8919635c4928607450d9e0abb932109ceToomas Soome    /* This is where we are (be honest if we overshot) */
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return(bzf->bzf_bzstream.total_out_lo32);
199767f8919635c4928607450d9e0abb932109ceToomas Soome}
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic int
199767f8919635c4928607450d9e0abb932109ceToomas Soomebzf_stat(struct open_file *f, struct stat *sb)
199767f8919635c4928607450d9e0abb932109ceToomas Soome{
199767f8919635c4928607450d9e0abb932109ceToomas Soome    struct bz_file  *bzf = (struct bz_file *)f->f_fsdata;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    int         result;
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    /* stat as normal, but indicate that size is unknown */
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if ((result = fstat(bzf->bzf_rawfd, sb)) == 0)
199767f8919635c4928607450d9e0abb932109ceToomas Soome    sb->st_size = -1;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    return(result);
199767f8919635c4928607450d9e0abb932109ceToomas Soome}
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soomevoid
199767f8919635c4928607450d9e0abb932109ceToomas Soomebz_internal_error(int errorcode)
199767f8919635c4928607450d9e0abb932109ceToomas Soome{
199767f8919635c4928607450d9e0abb932109ceToomas Soome    panic("bzipfs: critical error %d in bzip2 library occured\n", errorcode);
199767f8919635c4928607450d9e0abb932109ceToomas Soome}
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome#ifdef REGRESSION
199767f8919635c4928607450d9e0abb932109ceToomas Soome/* Small test case, open and decompress test.bz2 */
199767f8919635c4928607450d9e0abb932109ceToomas Soomeint main()
199767f8919635c4928607450d9e0abb932109ceToomas Soome{
199767f8919635c4928607450d9e0abb932109ceToomas Soome    struct open_file f;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    char buf[1024];
199767f8919635c4928607450d9e0abb932109ceToomas Soome    size_t resid;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    int err;
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    memset(&f, '\0', sizeof(f));
199767f8919635c4928607450d9e0abb932109ceToomas Soome    f.f_flags = F_READ;
199767f8919635c4928607450d9e0abb932109ceToomas Soome    err = bzf_open("test", &f);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if (err != 0)
199767f8919635c4928607450d9e0abb932109ceToomas Soome    exit(1);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    do {
199767f8919635c4928607450d9e0abb932109ceToomas Soome    err = bzf_read(&f, buf, sizeof(buf), &resid);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    } while (err == 0 && resid != sizeof(buf));
199767f8919635c4928607450d9e0abb932109ceToomas Soome
199767f8919635c4928607450d9e0abb932109ceToomas Soome    if (err != 0)
199767f8919635c4928607450d9e0abb932109ceToomas Soome    exit(2);
199767f8919635c4928607450d9e0abb932109ceToomas Soome    exit(0);
199767f8919635c4928607450d9e0abb932109ceToomas Soome}
199767f8919635c4928607450d9e0abb932109ceToomas Soome#endif