w32tex
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Compression.h
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1 /* GRAPHITE2 LICENSING
2 
3  Copyright 2015, SIL International
4  All rights reserved.
5 
6  This library is free software; you can redistribute it and/or modify
7  it under the terms of the GNU Lesser General Public License as published
8  by the Free Software Foundation; either version 2.1 of License, or
9  (at your option) any later version.
10 
11  This program is distributed in the hope that it will be useful,
12  but WITHOUT ANY WARRANTY; without even the implied warranty of
13  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  Lesser General Public License for more details.
15 
16  You should also have received a copy of the GNU Lesser General Public
17  License along with this library in the file named "LICENSE".
18  If not, write to the Free Software Foundation, 51 Franklin Street,
19  Suite 500, Boston, MA 02110-1335, USA or visit their web page on the
20  internet at http://www.fsf.org/licenses/lgpl.html.
21 
22 Alternatively, the contents of this file may be used under the terms of the
23 Mozilla Public License (http://mozilla.org/MPL) or the GNU General Public
24 License, as published by the Free Software Foundation, either version 2
25 of the License or (at your option) any later version.
26 */
27 
28 #pragma once
29 
30 #include <cassert>
31 #include <cstddef>
32 #include <cstring>
33 
34 namespace
35 {
36 
37 #if defined(_MSC_VER)
38 typedef unsigned __int8 u8;
39 typedef unsigned __int16 u16;
40 typedef unsigned __int32 u32;
41 typedef unsigned __int64 u64;
42 #else
43 #include <stdint.h>
44 typedef uint8_t u8;
45 typedef uint16_t u16;
46 typedef uint32_t u32;
47 typedef uint64_t u64;
48 #endif
49 
50 ptrdiff_t const MINMATCH = 4,
51  LASTLITERALS = 5,
52  MINCODA = LASTLITERALS+1,
53  MINSRCSIZE = 13;
54 
55 template<int S>
56 inline
57 void unaligned_copy(void * d, void const * s) {
58  ::memcpy(d, s, S);
59 }
60 
61 inline
62 size_t align(size_t p) {
63  return (p + sizeof(unsigned long)-1) & ~(sizeof(unsigned long)-1);
64 }
65 
66 inline
67 u8 * safe_copy(u8 * d, u8 const * s, size_t n) {
68  while (n--) *d++ = *s++;
69  return d;
70 }
71 
72 inline
73 u8 * overrun_copy(u8 * d, u8 const * s, size_t n) {
74  size_t const WS = sizeof(unsigned long);
75  u8 const * e = s + n;
76  do
77  {
78  unaligned_copy<WS>(d, s);
79  d += WS;
80  s += WS;
81  }
82  while (s < e);
83  d-=(s-e);
84 
85  return d;
86 }
87 
88 
89 inline
90 u8 * fast_copy(u8 * d, u8 const * s, size_t n) {
91  size_t const WS = sizeof(unsigned long);
92  size_t wn = n/WS;
93  while (wn--)
94  {
95  unaligned_copy<WS>(d, s);
96  d += WS;
97  s += WS;
98  }
99  n &= WS-1;
100  return safe_copy(d, s, n);
101 }
102 
103 
104 } // end of anonymous namespace
int ptrdiff_t
Definition: CPAL.d:3845
#define n
Definition: t4ht.c:1290
#define s
Definition: afcover.h:80
#define d(n)
Definition: gpos-common.c:151
#define memcpy(d, s, n)
Definition: gsftopk.c:64
#define u16
Definition: jbig2arith.cc:25
#define u32
Definition: jbig2arith.cc:24
#define u64
Definition: jbig2arith.cc:23
#define u8
Definition: jbig2arith.cc:26
small capitals from c petite p
Definition: afcover.h:72
unsigned short uint16_t
Definition: stdint.h:79
unsigned int uint32_t
Definition: stdint.h:80
unsigned char uint8_t
Definition: stdint.h:78
unsigned __int64 uint64_t
Definition: stdint.h:90
#define align(x, k)
Definition: obcommon.h:49
ShellFileEnvironment e
Definition: sh6.c:388
@ WS
Definition: ubidiimp.h:54
@ S
Definition: ubidiimp.h:53