[0c0f128] | 1 | /* |
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| 2 | * JFFS2 -- Journalling Flash File System, Version 2. |
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| 3 | * |
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| 4 | * Copyright © 2001-2007 Red Hat, Inc. |
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| 5 | * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org> |
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| 6 | * |
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| 7 | * Created by David Woodhouse <dwmw2@infradead.org> |
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| 8 | * |
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| 9 | * For licensing information, see the file 'LICENCE' in this directory. |
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| 10 | * |
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| 11 | */ |
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| 12 | |
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| 13 | #if !defined(__KERNEL__) && !defined(__ECOS) |
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| 14 | #error "The userspace support got too messy and was removed. Update your mkfs.jffs2" |
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| 15 | #endif |
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| 16 | |
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| 17 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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| 18 | |
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| 19 | #include <linux/kernel.h> |
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| 20 | #include <linux/zlib.h> |
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| 21 | #include <linux/zutil.h> |
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| 22 | #include "nodelist.h" |
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| 23 | #include "compr.h" |
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| 24 | |
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| 25 | /* Plan: call deflate() with avail_in == *sourcelen, |
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| 26 | avail_out = *dstlen - 12 and flush == Z_FINISH. |
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| 27 | If it doesn't manage to finish, call it again with |
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| 28 | avail_in == 0 and avail_out set to the remaining 12 |
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| 29 | bytes for it to clean up. |
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| 30 | Q: Is 12 bytes sufficient? |
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| 31 | */ |
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| 32 | #define STREAM_END_SPACE 12 |
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| 33 | |
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| 34 | static DEFINE_MUTEX(deflate_mutex); |
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| 35 | static DEFINE_MUTEX(inflate_mutex); |
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| 36 | |
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[3c96bee] | 37 | static rtems_jffs2_compressor_zlib_control *get_zlib_control( |
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| 38 | rtems_jffs2_compressor_control *super |
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| 39 | ) |
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[0c0f128] | 40 | { |
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[3c96bee] | 41 | return (rtems_jffs2_compressor_zlib_control *) super; |
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[0c0f128] | 42 | } |
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| 43 | |
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[3c96bee] | 44 | uint16_t rtems_jffs2_compressor_zlib_compress( |
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| 45 | rtems_jffs2_compressor_control *super, |
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| 46 | unsigned char *data_in, |
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| 47 | unsigned char *cpage_out, |
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| 48 | uint32_t *sourcelen, |
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| 49 | uint32_t *dstlen |
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| 50 | ) |
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[0c0f128] | 51 | { |
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[3c96bee] | 52 | rtems_jffs2_compressor_zlib_control *self = get_zlib_control(super); |
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| 53 | z_stream *def_strm = &self->stream; |
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[0c0f128] | 54 | int ret; |
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| 55 | |
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| 56 | if (*dstlen <= STREAM_END_SPACE) |
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[3c96bee] | 57 | return JFFS2_COMPR_NONE; |
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[0c0f128] | 58 | |
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| 59 | mutex_lock(&deflate_mutex); |
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| 60 | |
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[3c96bee] | 61 | if (Z_OK != zlib_deflateInit(def_strm, 3)) { |
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[0c0f128] | 62 | pr_warn("deflateInit failed\n"); |
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| 63 | mutex_unlock(&deflate_mutex); |
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[3c96bee] | 64 | return JFFS2_COMPR_NONE; |
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[0c0f128] | 65 | } |
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| 66 | |
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[3c96bee] | 67 | def_strm->next_in = data_in; |
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| 68 | def_strm->total_in = 0; |
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[0c0f128] | 69 | |
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[3c96bee] | 70 | def_strm->next_out = cpage_out; |
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| 71 | def_strm->total_out = 0; |
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[0c0f128] | 72 | |
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[3c96bee] | 73 | while (def_strm->total_out < *dstlen - STREAM_END_SPACE && def_strm->total_in < *sourcelen) { |
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| 74 | def_strm->avail_out = *dstlen - (def_strm->total_out + STREAM_END_SPACE); |
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| 75 | def_strm->avail_in = min((unsigned)(*sourcelen-def_strm->total_in), def_strm->avail_out); |
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[0c0f128] | 76 | jffs2_dbg(1, "calling deflate with avail_in %d, avail_out %d\n", |
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[3c96bee] | 77 | def_strm->avail_in, def_strm->avail_out); |
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| 78 | ret = zlib_deflate(def_strm, Z_PARTIAL_FLUSH); |
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[0c0f128] | 79 | jffs2_dbg(1, "deflate returned with avail_in %d, avail_out %d, total_in %ld, total_out %ld\n", |
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[3c96bee] | 80 | def_strm->avail_in, def_strm->avail_out, |
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| 81 | def_strm->total_in, def_strm->total_out); |
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[0c0f128] | 82 | if (ret != Z_OK) { |
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| 83 | jffs2_dbg(1, "deflate in loop returned %d\n", ret); |
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[3c96bee] | 84 | zlib_deflateEnd(def_strm); |
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[0c0f128] | 85 | mutex_unlock(&deflate_mutex); |
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[3c96bee] | 86 | return JFFS2_COMPR_NONE; |
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[0c0f128] | 87 | } |
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| 88 | } |
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[3c96bee] | 89 | def_strm->avail_out += STREAM_END_SPACE; |
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| 90 | def_strm->avail_in = 0; |
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| 91 | ret = zlib_deflate(def_strm, Z_FINISH); |
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| 92 | zlib_deflateEnd(def_strm); |
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[0c0f128] | 93 | |
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| 94 | if (ret != Z_STREAM_END) { |
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| 95 | jffs2_dbg(1, "final deflate returned %d\n", ret); |
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[3c96bee] | 96 | ret = JFFS2_COMPR_NONE; |
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[0c0f128] | 97 | goto out; |
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| 98 | } |
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| 99 | |
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[3c96bee] | 100 | if (def_strm->total_out >= def_strm->total_in) { |
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[0c0f128] | 101 | jffs2_dbg(1, "zlib compressed %ld bytes into %ld; failing\n", |
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[3c96bee] | 102 | def_strm->total_in, def_strm->total_out); |
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| 103 | ret = JFFS2_COMPR_NONE; |
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[0c0f128] | 104 | goto out; |
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| 105 | } |
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| 106 | |
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| 107 | jffs2_dbg(1, "zlib compressed %ld bytes into %ld\n", |
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[3c96bee] | 108 | def_strm->total_in, def_strm->total_out); |
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[0c0f128] | 109 | |
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[3c96bee] | 110 | *dstlen = def_strm->total_out; |
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| 111 | *sourcelen = def_strm->total_in; |
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| 112 | ret = JFFS2_COMPR_ZLIB; |
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[0c0f128] | 113 | out: |
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| 114 | mutex_unlock(&deflate_mutex); |
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| 115 | return ret; |
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| 116 | } |
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| 117 | |
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[3c96bee] | 118 | int rtems_jffs2_compressor_zlib_decompress( |
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| 119 | rtems_jffs2_compressor_control *super, |
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| 120 | uint16_t comprtype, |
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| 121 | unsigned char *data_in, |
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| 122 | unsigned char *cpage_out, |
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| 123 | uint32_t srclen, |
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| 124 | uint32_t destlen |
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| 125 | ) |
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[0c0f128] | 126 | { |
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[3c96bee] | 127 | rtems_jffs2_compressor_zlib_control *self = get_zlib_control(super); |
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| 128 | z_stream *inf_strm = &self->stream; |
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[0c0f128] | 129 | int ret; |
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| 130 | int wbits = MAX_WBITS; |
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| 131 | |
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[3c96bee] | 132 | if (comprtype != JFFS2_COMPR_ZLIB) { |
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| 133 | return -EIO; |
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| 134 | } |
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| 135 | |
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[0c0f128] | 136 | mutex_lock(&inflate_mutex); |
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| 137 | |
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[3c96bee] | 138 | inf_strm->next_in = data_in; |
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| 139 | inf_strm->avail_in = srclen; |
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| 140 | inf_strm->total_in = 0; |
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[0c0f128] | 141 | |
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[3c96bee] | 142 | inf_strm->next_out = cpage_out; |
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| 143 | inf_strm->avail_out = destlen; |
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| 144 | inf_strm->total_out = 0; |
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[0c0f128] | 145 | |
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| 146 | /* If it's deflate, and it's got no preset dictionary, then |
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| 147 | we can tell zlib to skip the adler32 check. */ |
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| 148 | if (srclen > 2 && !(data_in[1] & PRESET_DICT) && |
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| 149 | ((data_in[0] & 0x0f) == Z_DEFLATED) && |
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| 150 | !(((data_in[0]<<8) + data_in[1]) % 31)) { |
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| 151 | |
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| 152 | jffs2_dbg(2, "inflate skipping adler32\n"); |
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| 153 | wbits = -((data_in[0] >> 4) + 8); |
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[3c96bee] | 154 | inf_strm->next_in += 2; |
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| 155 | inf_strm->avail_in -= 2; |
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[0c0f128] | 156 | } else { |
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| 157 | /* Let this remain D1 for now -- it should never happen */ |
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| 158 | jffs2_dbg(1, "inflate not skipping adler32\n"); |
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| 159 | } |
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| 160 | |
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| 161 | |
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[3c96bee] | 162 | if (Z_OK != zlib_inflateInit2(inf_strm, wbits)) { |
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[0c0f128] | 163 | pr_warn("inflateInit failed\n"); |
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| 164 | mutex_unlock(&inflate_mutex); |
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[3c96bee] | 165 | return -EIO; |
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[0c0f128] | 166 | } |
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| 167 | |
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[3c96bee] | 168 | while((ret = zlib_inflate(inf_strm, Z_FINISH)) == Z_OK) |
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[0c0f128] | 169 | ; |
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| 170 | if (ret != Z_STREAM_END) { |
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| 171 | pr_notice("inflate returned %d\n", ret); |
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| 172 | } |
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[3c96bee] | 173 | zlib_inflateEnd(inf_strm); |
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[0c0f128] | 174 | mutex_unlock(&inflate_mutex); |
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| 175 | return 0; |
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| 176 | } |
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