LXR uboot/fs/cramfs/uncompress.c

   1/*
   2 * uncompress.c
   3 *
   4 * Copyright (C) 1999 Linus Torvalds
   5 * Copyright (C) 2000-2002 Transmeta Corporation
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License (Version 2) as
   9 * published by the Free Software Foundation.
  10 *
  11 * cramfs interfaces to the uncompression library. There's really just
  12 * three entrypoints:
  13 *
  14 *  - cramfs_uncompress_init() - called to initialize the thing.
  15 *  - cramfs_uncompress_exit() - tell me when you're done
  16 *  - cramfs_uncompress_block() - uncompress a block.
  17 *
  18 * NOTE NOTE NOTE! The uncompression is entirely single-threaded. We
  19 * only have one stream, and we'll initialize it only once even if it
  20 * then is used by multiple filesystems.
  21 */
  22
  23#include <common.h>
  24#include <malloc.h>
  25#include <watchdog.h>
  26#include <u-boot/zlib.h>
  27
  28static z_stream stream;
  29
  30/* Returns length of decompressed data. */
  31int cramfs_uncompress_block (void *dst, void *src, int srclen)
  32{
  33        int err;
  34
  35        inflateReset (&stream);
  36
  37        stream.next_in = src;
  38        stream.avail_in = srclen;
  39
  40        stream.next_out = dst;
  41        stream.avail_out = 4096 * 2;
  42
  43        err = inflate (&stream, Z_FINISH);
  44
  45        if (err != Z_STREAM_END)
  46                goto err;
  47        return stream.total_out;
  48
  49      err:
  50        /*printf ("Error %d while decompressing!\n", err); */
  51        /*printf ("%p(%d)->%p\n", src, srclen, dst); */
  52        return -1;
  53}
  54
  55int cramfs_uncompress_init (void)
  56{
  57        int err;
  58
  59        stream.zalloc = gzalloc;
  60        stream.zfree = gzfree;
  61        stream.next_in = 0;
  62        stream.avail_in = 0;
  63
  64#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
  65        stream.outcb = (cb_func) WATCHDOG_RESET;
  66#else
  67        stream.outcb = Z_NULL;
  68#endif /* CONFIG_HW_WATCHDOG */
  69
  70        err = inflateInit (&stream);
  71        if (err != Z_OK) {
  72                printf ("Error: inflateInit2() returned %d\n", err);
  73                return -1;
  74        }
  75
  76        return 0;
  77}
  78
  79int cramfs_uncompress_exit (void)
  80{
  81        inflateEnd (&stream);
  82        return 0;
  83}
  84