| 1 | /*
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| 2 | * Copyright (c) 2000-2007 Marc Alexander Lehmann <schmorp@schmorp.de>
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| 3 | *
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| 4 | * Redistribution and use in source and binary forms, with or without modifica-
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| 5 | * tion, are permitted provided that the following conditions are met:
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| 6 | *
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| 7 | * 1. Redistributions of source code must retain the above copyright notice,
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| 8 | * this list of conditions and the following disclaimer.
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| 9 | *
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer in the
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| 12 | * documentation and/or other materials provided with the distribution.
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| 13 | *
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| 14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 15 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
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| 16 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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| 17 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
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| 18 | * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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| 19 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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| 20 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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| 21 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
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| 22 | * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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| 23 | * OF THE POSSIBILITY OF SUCH DAMAGE.
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| 24 | *
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| 25 | * Alternatively, the contents of this file may be used under the terms of
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| 26 | * the GNU General Public License ("GPL") version 2 or any later version,
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| 27 | * in which case the provisions of the GPL are applicable instead of
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| 28 | * the above. If you wish to allow the use of your version of this file
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| 29 | * only under the terms of the GPL and not to allow others to use your
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| 30 | * version of this file under the BSD license, indicate your decision
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| 31 | * by deleting the provisions above and replace them with the notice
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| 32 | * and other provisions required by the GPL. If you do not delete the
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| 33 | * provisions above, a recipient may use your version of this file under
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| 34 | * either the BSD or the GPL.
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| 35 | */
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| 36 |
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| 37 | #include "lzfP.h"
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| 38 | #ifdef VBOX
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| 39 | # include "lzf.h" /* need the prototype */
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| 40 | #endif
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| 41 |
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| 42 | #if AVOID_ERRNO
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| 43 | # define SET_ERRNO(n)
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| 44 | #else
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| 45 | # include <errno.h>
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| 46 | # define SET_ERRNO(n) errno = (n)
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| 47 | #endif
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| 48 |
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| 49 | #if (__i386 || __amd64) && __GNUC__ >= 3
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| 50 | # define lzf_movsb(dst, src, len) \
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| 51 | asm ("rep movsb" \
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| 52 | : "=D" (dst), "=S" (src), "=c" (len) \
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| 53 | : "0" (dst), "1" (src), "2" (len));
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| 54 | #endif
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| 55 |
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| 56 | unsigned int
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| 57 | lzf_decompress (const void *const in_data, unsigned int in_len,
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| 58 | void *out_data, unsigned int out_len)
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| 59 | {
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| 60 | u8 const *ip = (const u8 *)in_data;
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| 61 | u8 *op = (u8 *)out_data;
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| 62 | u8 const *const in_end = ip + in_len;
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| 63 | u8 *const out_end = op + out_len;
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| 64 |
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| 65 | do
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| 66 | {
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| 67 | unsigned int ctrl = *ip++;
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| 68 |
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| 69 | if (ctrl < (1 << 5)) /* literal run */
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| 70 | {
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| 71 | ctrl++;
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| 72 |
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| 73 | if (op + ctrl > out_end)
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| 74 | {
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| 75 | SET_ERRNO (E2BIG);
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| 76 | return 0;
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| 77 | }
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| 78 |
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| 79 | #if CHECK_INPUT
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| 80 | if (ip + ctrl > in_end)
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| 81 | {
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| 82 | SET_ERRNO (EINVAL);
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| 83 | return 0;
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| 84 | }
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| 85 | #endif
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| 86 |
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| 87 | #ifdef lzf_movsb
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| 88 | lzf_movsb (op, ip, ctrl);
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| 89 | #else
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| 90 | do
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| 91 | *op++ = *ip++;
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| 92 | while (--ctrl);
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| 93 | #endif
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| 94 | }
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| 95 | else /* back reference */
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| 96 | {
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| 97 | unsigned int len = ctrl >> 5;
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| 98 |
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| 99 | u8 *ref = op - ((ctrl & 0x1f) << 8) - 1;
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| 100 |
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| 101 | #if CHECK_INPUT
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| 102 | if (ip >= in_end)
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| 103 | {
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| 104 | SET_ERRNO (EINVAL);
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| 105 | return 0;
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| 106 | }
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| 107 | #endif
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| 108 | if (len == 7)
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| 109 | {
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| 110 | len += *ip++;
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| 111 | #if CHECK_INPUT
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| 112 | if (ip >= in_end)
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| 113 | {
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| 114 | SET_ERRNO (EINVAL);
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| 115 | return 0;
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| 116 | }
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| 117 | #endif
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| 118 | }
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| 119 |
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| 120 | ref -= *ip++;
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| 121 |
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| 122 | if (op + len + 2 > out_end)
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| 123 | {
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| 124 | SET_ERRNO (E2BIG);
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| 125 | return 0;
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| 126 | }
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| 127 |
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| 128 | if (ref < (u8 *)out_data)
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| 129 | {
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| 130 | SET_ERRNO (EINVAL);
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| 131 | return 0;
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| 132 | }
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| 133 |
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| 134 | #ifdef lzf_movsb
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| 135 | len += 2;
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| 136 | lzf_movsb (op, ref, len);
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| 137 | #else
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| 138 | *op++ = *ref++;
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| 139 | *op++ = *ref++;
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| 140 |
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| 141 | do
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| 142 | *op++ = *ref++;
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| 143 | while (--len);
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| 144 | #endif
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| 145 | }
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| 146 | }
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| 147 | while (ip < in_end);
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| 148 |
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| 149 | return op - (u8 *)out_data;
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| 150 | }
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| 151 |
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