| 1 | /*
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| 2 | * Copyright (c) 2000-2005 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 | * 3. The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 18 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
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| 19 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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| 20 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
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| 21 | * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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| 22 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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| 23 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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| 24 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
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| 25 | * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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| 26 | * OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | *
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| 28 | * Alternatively, the contents of this file may be used under the terms of
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| 29 | * the GNU General Public License version 2 (the "GPL"), in which case the
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| 30 | * provisions of the GPL are applicable instead of the above. If you wish to
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| 31 | * allow the use of your version of this file only under the terms of the
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| 32 | * GPL and not to allow others to use your version of this file under the
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| 33 | * BSD license, indicate your decision by deleting the provisions above and
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| 34 | * replace them with the notice and other provisions required by the GPL. If
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| 35 | * you do not delete the provisions above, a recipient may use your version
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| 36 | * of this file under either the BSD or the GPL.
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| 37 | */
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| 38 |
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| 39 | #include "lzfP.h"
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| 40 | #ifdef VBOX
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| 41 | #include "lzf.h"
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| 42 | #endif
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| 43 |
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| 44 | #if AVOID_ERRNO
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| 45 | # define SET_ERRNO(n)
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| 46 | #else
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| 47 | # include <errno.h>
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| 48 | # define SET_ERRNO(n) errno = (n)
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| 49 | #endif
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| 50 |
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| 51 | unsigned int
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| 52 | lzf_decompress (const void *const in_data, unsigned int in_len,
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| 53 | void *out_data, unsigned int out_len)
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| 54 | {
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| 55 | u8 const *ip = (const u8 *)in_data;
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| 56 | u8 *op = (u8 *)out_data;
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| 57 | u8 const *const in_end = ip + in_len;
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| 58 | u8 *const out_end = op + out_len;
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| 59 |
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| 60 | do
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| 61 | {
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| 62 | unsigned int ctrl = *ip++;
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| 63 |
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| 64 | if (ctrl < (1 << 5)) /* literal run */
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| 65 | {
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| 66 | ctrl++;
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| 67 |
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| 68 | if (op + ctrl > out_end)
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| 69 | {
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| 70 | SET_ERRNO (E2BIG);
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| 71 | return 0;
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| 72 | }
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| 73 |
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| 74 | #if USE_MEMCPY
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| 75 | memcpy (op, ip, ctrl);
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| 76 | op += ctrl;
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| 77 | ip += ctrl;
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| 78 | #else
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| 79 | do
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| 80 | *op++ = *ip++;
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| 81 | while (--ctrl);
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| 82 | #endif
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| 83 | }
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| 84 | else /* back reference */
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| 85 | {
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| 86 | unsigned int len = ctrl >> 5;
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| 87 |
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| 88 | u8 *ref = op - ((ctrl & 0x1f) << 8) - 1;
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| 89 |
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| 90 | if (len == 7)
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| 91 | len += *ip++;
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| 92 |
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| 93 | ref -= *ip++;
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| 94 |
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| 95 | if (op + len + 2 > out_end)
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| 96 | {
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| 97 | SET_ERRNO (E2BIG);
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| 98 | return 0;
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| 99 | }
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| 100 |
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| 101 | if (ref < (u8 *)out_data)
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| 102 | {
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| 103 | SET_ERRNO (EINVAL);
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| 104 | return 0;
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| 105 | }
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| 106 |
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| 107 | *op++ = *ref++;
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| 108 | *op++ = *ref++;
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| 109 |
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| 110 | do
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| 111 | *op++ = *ref++;
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| 112 | while (--len);
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| 113 | }
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| 114 | }
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| 115 | while (op < out_end && ip < in_end);
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| 116 |
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| 117 | return op - (u8 *)out_data;
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| 118 | }
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| 119 |
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