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-rw-r--r--apps/codecs/libgme/blargg_endian.h147
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diff --git a/apps/codecs/libgme/blargg_endian.h b/apps/codecs/libgme/blargg_endian.h
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1// CPU Byte Order Utilities
2
3// Game_Music_Emu 0.5.2
4#ifndef BLARGG_ENDIAN
5#define BLARGG_ENDIAN
6
7#include "blargg_common.h"
8
9// BLARGG_CPU_CISC: Defined if CPU has very few general-purpose registers (< 16)
10#if defined (_M_IX86) || defined (_M_IA64) || defined (__i486__) || \
11 defined (__x86_64__) || defined (__ia64__) || defined (__i386__)
12 #define BLARGG_CPU_X86 1
13 #define BLARGG_CPU_CISC 1
14#endif
15
16#if defined (__powerpc__) || defined (__ppc__) || defined (__POWERPC__) || defined (__powerc)
17 #define BLARGG_CPU_POWERPC 1
18#endif
19
20// BLARGG_BIG_ENDIAN, BLARGG_LITTLE_ENDIAN: Determined automatically, otherwise only
21// one may be #defined to 1. Only needed if something actually depends on byte order.
22#if !defined (BLARGG_BIG_ENDIAN) && !defined (BLARGG_LITTLE_ENDIAN)
23#ifdef __GLIBC__
24 // GCC handles this for us
25 #include <endian.h>
26 #if __BYTE_ORDER == __LITTLE_ENDIAN
27 #define BLARGG_LITTLE_ENDIAN 1
28 #elif __BYTE_ORDER == __BIG_ENDIAN
29 #define BLARGG_BIG_ENDIAN 1
30 #endif
31#else
32
33#if defined (LSB_FIRST) || defined (__LITTLE_ENDIAN__) || defined (BLARGG_CPU_X86) || \
34 (defined (LITTLE_ENDIAN) && LITTLE_ENDIAN+0 != 1234)
35 #define BLARGG_LITTLE_ENDIAN 1
36#endif
37
38#if defined (MSB_FIRST) || defined (__BIG_ENDIAN__) || defined (WORDS_BIGENDIAN) || \
39 defined (__mips__) || defined (__sparc__) || defined (BLARGG_CPU_POWERPC) || \
40 (defined (BIG_ENDIAN) && BIG_ENDIAN+0 != 4321)
41 #define BLARGG_BIG_ENDIAN 1
42#else
43 // No endian specified; assume little-endian, since it's most common
44 #define BLARGG_LITTLE_ENDIAN 1
45#endif
46#endif
47#endif
48
49#if defined (BLARGG_LITTLE_ENDIAN) && defined(BLARGG_BIG_ENDIAN)
50 #undef BLARGG_LITTLE_ENDIAN
51 #undef BLARGG_BIG_ENDIAN
52#endif
53
54static inline void blargg_verify_byte_order( void )
55{
56 #ifndef NDEBUG
57 #if BLARGG_BIG_ENDIAN
58 volatile int i = 1;
59 assert( *(volatile char*) &i == 0 );
60 #elif BLARGG_LITTLE_ENDIAN
61 volatile int i = 1;
62 assert( *(volatile char*) &i != 0 );
63 #endif
64 #endif
65}
66
67static inline unsigned get_le16( void const* p ) {
68 return ((unsigned char const*) p) [1] * 0x100u +
69 ((unsigned char const*) p) [0];
70}
71static inline unsigned get_be16( void const* p ) {
72 return ((unsigned char const*) p) [0] * 0x100u +
73 ((unsigned char const*) p) [1];
74}
75static inline blargg_ulong get_le32( void const* p ) {
76 return ((unsigned char const*) p) [3] * 0x01000000u +
77 ((unsigned char const*) p) [2] * 0x00010000u +
78 ((unsigned char const*) p) [1] * 0x00000100u +
79 ((unsigned char const*) p) [0];
80}
81static inline blargg_ulong get_be32( void const* p ) {
82 return ((unsigned char const*) p) [0] * 0x01000000u +
83 ((unsigned char const*) p) [1] * 0x00010000u +
84 ((unsigned char const*) p) [2] * 0x00000100u +
85 ((unsigned char const*) p) [3];
86}
87static inline void set_le16( void* p, unsigned n ) {
88 ((unsigned char*) p) [1] = (unsigned char) (n >> 8);
89 ((unsigned char*) p) [0] = (unsigned char) n;
90}
91static inline void set_be16( void* p, unsigned n ) {
92 ((unsigned char*) p) [0] = (unsigned char) (n >> 8);
93 ((unsigned char*) p) [1] = (unsigned char) n;
94}
95static inline void set_le32( void* p, blargg_ulong n ) {
96 ((unsigned char*) p) [3] = (unsigned char) (n >> 24);
97 ((unsigned char*) p) [2] = (unsigned char) (n >> 16);
98 ((unsigned char*) p) [1] = (unsigned char) (n >> 8);
99 ((unsigned char*) p) [0] = (unsigned char) n;
100}
101static inline void set_be32( void* p, blargg_ulong n ) {
102 ((unsigned char*) p) [0] = (unsigned char) (n >> 24);
103 ((unsigned char*) p) [1] = (unsigned char) (n >> 16);
104 ((unsigned char*) p) [2] = (unsigned char) (n >> 8);
105 ((unsigned char*) p) [3] = (unsigned char) n;
106}
107
108#if defined(BLARGG_NONPORTABLE)
109 // Optimized implementation if byte order is known
110 #if defined(BLARGG_LITTLE_ENDIAN)
111 #define GET_LE16( addr ) (*(BOOST::uint16_t*) (addr))
112 #define GET_LE32( addr ) (*(BOOST::uint32_t*) (addr))
113 #define SET_LE16( addr, data ) (void) (*(BOOST::uint16_t*) (addr) = (data))
114 #define SET_LE32( addr, data ) (void) (*(BOOST::uint32_t*) (addr) = (data))
115 #elif defined(BLARGG_BIG_ENDIAN)
116 #define GET_BE16( addr ) (*(BOOST::uint16_t*) (addr))
117 #define GET_BE32( addr ) (*(BOOST::uint32_t*) (addr))
118 #define SET_BE16( addr, data ) (void) (*(BOOST::uint16_t*) (addr) = (data))
119 #define SET_BE32( addr, data ) (void) (*(BOOST::uint32_t*) (addr) = (data))
120 #endif
121
122 #if defined(BLARGG_CPU_POWERPC) && defined (__MWERKS__)
123 // PowerPC has special byte-reversed instructions
124 // to do: assumes that PowerPC is running in big-endian mode
125 // to do: implement for other compilers which don't support these macros
126 #define GET_LE16( addr ) (__lhbrx( (addr), 0 ))
127 #define GET_LE32( addr ) (__lwbrx( (addr), 0 ))
128 #define SET_LE16( addr, data ) (__sthbrx( (data), (addr), 0 ))
129 #define SET_LE32( addr, data ) (__stwbrx( (data), (addr), 0 ))
130 #endif
131#endif
132
133#ifndef GET_LE16
134 #define GET_LE16( addr ) get_le16( addr )
135 #define GET_LE32( addr ) get_le32( addr )
136 #define SET_LE16( addr, data ) set_le16( addr, data )
137 #define SET_LE32( addr, data ) set_le32( addr, data )
138#endif
139
140#ifndef GET_BE16
141 #define GET_BE16( addr ) get_be16( addr )
142 #define GET_BE32( addr ) get_be32( addr )
143 #define SET_BE16( addr, data ) set_be16( addr, data )
144 #define SET_BE32( addr, data ) set_be32( addr, data )
145#endif
146
147#endif
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