|
jens@0
|
1 |
/*
|
|
jens@0
|
2 |
* Base.h
|
|
jens@0
|
3 |
* Ottoman
|
|
jens@0
|
4 |
*
|
|
jens@0
|
5 |
* Created by Jens Alfke on 8/18/09.
|
|
jens@0
|
6 |
* Copyright 2009 Jens Alfke. All rights reserved.
|
|
jens@0
|
7 |
* BSD-Licensed: See the file "LICENSE.txt" for details.
|
|
jens@0
|
8 |
*/
|
|
jens@0
|
9 |
|
|
jens@0
|
10 |
#ifndef _MOOSEYARD_BASE_
|
|
jens@0
|
11 |
#define _MOOSEYARD_BASE_
|
|
jens@0
|
12 |
#include <stdlib.h>
|
|
jens@0
|
13 |
#include <stdint.h>
|
|
jens@0
|
14 |
#include <string.h>
|
|
jbm@8
|
15 |
|
|
jbm@8
|
16 |
#if OSX
|
|
jbm@8
|
17 |
/* OS X specific bits */
|
|
jens@0
|
18 |
#include <libkern/OSByteOrder.h>
|
|
jens@0
|
19 |
#include <CoreFoundation/CFByteOrder.h>
|
|
jens@0
|
20 |
|
|
jbm@8
|
21 |
#else
|
|
jbm@8
|
22 |
/* OS X fixup kludge bits */
|
|
jbm@8
|
23 |
|
|
jbm@8
|
24 |
#include <cf_fixup.h>
|
|
jbm@8
|
25 |
#include <stdint.h>
|
|
jbm@8
|
26 |
|
|
jbm@8
|
27 |
#endif
|
|
jbm@8
|
28 |
|
|
jens@0
|
29 |
namespace Mooseyard {
|
|
jens@0
|
30 |
|
|
jens@0
|
31 |
/** A 32-bit file position/offset. Supports files of up to 4GB. */
|
|
jens@0
|
32 |
typedef uint32_t FilePosition;
|
|
jens@0
|
33 |
const FilePosition kNoFilePosition = (FilePosition)-1L;
|
|
jens@0
|
34 |
|
|
jens@0
|
35 |
|
|
jens@0
|
36 |
/** A simple structure representing a range of memory (a pointer plus a length).
|
|
jens@0
|
37 |
It doesn't do any memory management; it just points. */
|
|
jens@0
|
38 |
struct Blob {
|
|
jens@0
|
39 |
const void *bytes;
|
|
jens@0
|
40 |
size_t length;
|
|
jens@0
|
41 |
|
|
jens@0
|
42 |
Blob() :bytes(NULL), length(0) { }
|
|
jens@0
|
43 |
Blob (const void *b, size_t len) :bytes(b), length(len) { }
|
|
jens@0
|
44 |
Blob (const char *str);
|
|
jens@0
|
45 |
const void* end() const {return (const uint8_t*)bytes+length;}
|
|
jens@0
|
46 |
|
|
jens@0
|
47 |
operator bool() const {return bytes!=NULL;}
|
|
jens@0
|
48 |
bool operator== (const Blob &b) {return bytes==b.bytes && length==b.length;}
|
|
jens@0
|
49 |
bool equals (const Blob &b) const {return length==b.length && memcmp(bytes,b.bytes,length)==0;}
|
|
jens@0
|
50 |
void clear() {bytes=NULL; length=0;}
|
|
jens@0
|
51 |
};
|
|
jens@0
|
52 |
|
|
jens@0
|
53 |
|
|
jens@0
|
54 |
// Utility to offset a pointer by some number of bytes.
|
|
jens@0
|
55 |
inline const void* offsetBy(const void *src, size_t off) {return (const uint8_t*)src + off;}
|
|
jens@0
|
56 |
inline void* offsetBy(void *src, size_t off) {return (uint8_t*)src + off;}
|
|
jens@0
|
57 |
|
|
jens@0
|
58 |
|
|
jens@0
|
59 |
#define UNCOPYABLE(CLASS) private: CLASS(const CLASS&); CLASS& operator=(const CLASS&)
|
|
jens@0
|
60 |
|
|
jens@0
|
61 |
|
|
jens@0
|
62 |
#pragma mark -
|
|
jens@0
|
63 |
#pragma mark LITTLE-ENDIAN:
|
|
jens@0
|
64 |
|
|
jens@0
|
65 |
/** A template for numeric types that are always stored in little-endian form.
|
|
jens@0
|
66 |
Useful for structures stored in files that need to be useable on all architectures. */
|
|
jens@0
|
67 |
template <typename INT, typename REP=INT>
|
|
jens@0
|
68 |
class LittleEndian {
|
|
jens@0
|
69 |
public:
|
|
jens@0
|
70 |
inline LittleEndian ();
|
|
jens@0
|
71 |
inline LittleEndian (INT);
|
|
jens@0
|
72 |
inline operator INT() const;
|
|
jens@0
|
73 |
inline LittleEndian& operator= (INT);
|
|
jens@0
|
74 |
inline LittleEndian& operator= (const LittleEndian&);
|
|
jens@0
|
75 |
inline LittleEndian& operator++();
|
|
jens@0
|
76 |
inline LittleEndian& operator--();
|
|
jens@0
|
77 |
private:
|
|
jens@0
|
78 |
static inline REP makeLittle (INT);
|
|
jens@0
|
79 |
static inline INT makeNative (REP);
|
|
jens@0
|
80 |
REP _value;
|
|
jens@0
|
81 |
};
|
|
jens@0
|
82 |
|
|
jens@0
|
83 |
typedef LittleEndian<double,CFSwappedFloat64> LittleEndianDouble;
|
|
jens@0
|
84 |
|
|
jens@0
|
85 |
|
|
jens@0
|
86 |
// Implementation gunk:
|
|
jens@0
|
87 |
template <typename INT, typename REP>
|
|
jens@0
|
88 |
inline LittleEndian<INT,REP>::LittleEndian () :_value() { }
|
|
jens@0
|
89 |
template <typename INT, typename REP>
|
|
jens@0
|
90 |
inline LittleEndian<INT,REP>::LittleEndian (INT i) :_value(makeLittle(i)) { }
|
|
jens@0
|
91 |
template <typename INT, typename REP>
|
|
jens@0
|
92 |
inline LittleEndian<INT,REP>::operator INT() const {return makeNative(_value);}
|
|
jens@0
|
93 |
template <typename INT, typename REP>
|
|
jens@0
|
94 |
inline LittleEndian<INT,REP>& LittleEndian<INT,REP>::operator++() {return *this = (INT)*this + 1;}
|
|
jens@0
|
95 |
template <typename INT, typename REP>
|
|
jens@0
|
96 |
inline LittleEndian<INT,REP>& LittleEndian<INT,REP>::operator--() {return *this = (INT)*this - 1;}
|
|
jens@0
|
97 |
|
|
jens@0
|
98 |
template <typename INT, typename REP>
|
|
jens@0
|
99 |
inline LittleEndian<INT,REP>& LittleEndian<INT,REP>::operator= (INT i) {
|
|
jens@0
|
100 |
_value = makeLittle(i);
|
|
jens@0
|
101 |
return *this;
|
|
jens@0
|
102 |
}
|
|
jens@0
|
103 |
template <typename INT, typename REP>
|
|
jens@0
|
104 |
inline LittleEndian<INT,REP>& LittleEndian<INT,REP>::operator= (const LittleEndian<INT,REP> &p) {
|
|
jens@0
|
105 |
_value = p._value;
|
|
jens@0
|
106 |
return *this;
|
|
jens@0
|
107 |
}
|
|
jens@0
|
108 |
|
|
jens@0
|
109 |
template <> inline uint32_t LittleEndian<uint32_t>::makeLittle (uint32_t i)
|
|
jens@0
|
110 |
{return OSSwapHostToLittleInt32(i);}
|
|
jens@0
|
111 |
template <> inline uint32_t LittleEndian<uint32_t>::makeNative (uint32_t i)
|
|
jens@0
|
112 |
{return OSSwapLittleToHostInt32(i);}
|
|
jens@0
|
113 |
template <> inline uint16_t LittleEndian<uint16_t>::makeLittle (uint16_t i)
|
|
jens@0
|
114 |
{return OSSwapHostToLittleInt16(i);}
|
|
jens@0
|
115 |
template <> inline uint16_t LittleEndian<uint16_t>::makeNative (uint16_t i)
|
|
jens@0
|
116 |
{return OSSwapLittleToHostInt16(i);}
|
|
jens@0
|
117 |
template <> inline CFSwappedFloat64 LittleEndian<double,CFSwappedFloat64>::makeLittle (double d)
|
|
jens@0
|
118 |
{return CFConvertDoubleHostToSwapped(d);}
|
|
jens@0
|
119 |
template <> inline double LittleEndian<double,CFSwappedFloat64>::makeNative (CFSwappedFloat64 d)
|
|
jens@0
|
120 |
{return CFConvertDoubleSwappedToHost(d);}
|
|
jens@0
|
121 |
|
|
jens@0
|
122 |
}
|
|
jens@0
|
123 |
|
|
jbm@8
|
124 |
#endif /* _MOOSEYARD_BASE_ */
|