1 | /* |
2 | Copyright (c) 2015-2016, Apple Inc. All rights reserved. |
3 | |
4 | Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: |
5 | |
6 | 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. |
7 | |
8 | 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer |
9 | in the documentation and/or other materials provided with the distribution. |
10 | |
11 | 3. Neither the name of the copyright holder(s) nor the names of any contributors may be used to endorse or promote products derived |
12 | from this software without specific prior written permission. |
13 | |
14 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
15 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
16 | COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
17 | (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
18 | HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
19 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
20 | */ |
21 | |
22 | // LZVN low-level decoder (v2) |
23 | // Functions in the low-level API should switch to these at some point. |
24 | // Apr 2014 |
25 | |
26 | #ifndef LZVN_DECODE_BASE_H |
27 | #define LZVN_DECODE_BASE_H |
28 | |
29 | #include "lzfse_internal.h" |
30 | |
31 | /*! @abstract Base decoder state. */ |
32 | typedef struct { |
33 | |
34 | // Decoder I/O |
35 | |
36 | // Next byte to read in source buffer |
37 | const unsigned char *src; |
38 | // Next byte after source buffer |
39 | const unsigned char *src_end; |
40 | |
41 | // Next byte to write in destination buffer (by decoder) |
42 | unsigned char *dst; |
43 | // Valid range for destination buffer is [dst_begin, dst_end - 1] |
44 | unsigned char *dst_begin; |
45 | unsigned char *dst_end; |
46 | // Next byte to read in destination buffer (modified by caller) |
47 | unsigned char *dst_current; |
48 | |
49 | // Decoder state |
50 | |
51 | // Partially expanded match, or 0,0,0. |
52 | // In that case, src points to the next literal to copy, or the next op-code |
53 | // if L==0. |
54 | size_t L, M, D; |
55 | |
56 | // Distance for last emitted match, or 0 |
57 | lzvn_offset d_prev; |
58 | |
59 | // Did we decode end-of-stream? |
60 | int end_of_stream; |
61 | |
62 | } lzvn_decoder_state; |
63 | |
64 | /*! @abstract Decode source to destination. |
65 | * Updates \p state (src,dst,d_prev). */ |
66 | void lzvn_decode(lzvn_decoder_state *state); |
67 | |
68 | #endif // LZVN_DECODE_BASE_H |
69 | |