1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
|
#ifndef BASE64_ENV_H
#define BASE64_ENV_H
#include <stdint.h>
// This header file contains macro definitions that describe certain aspects of
// the compile-time environment. Compatibility and portability macros go here.
// Define machine endianness. This is for GCC:
#if (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
# define BASE64_LITTLE_ENDIAN 1
#else
# define BASE64_LITTLE_ENDIAN 0
#endif
// This is for Clang:
#ifdef __LITTLE_ENDIAN__
# define BASE64_LITTLE_ENDIAN 1
#endif
#ifdef __BIG_ENDIAN__
# define BASE64_LITTLE_ENDIAN 0
#endif
// MSVC++ needs intrin.h for _byteswap_uint64 (issue #68):
#if BASE64_LITTLE_ENDIAN && defined(_MSC_VER)
# include <intrin.h>
#endif
// Endian conversion functions:
#if BASE64_LITTLE_ENDIAN
# ifdef _MSC_VER
// Microsoft Visual C++:
# define BASE64_HTOBE32(x) _byteswap_ulong(x)
# define BASE64_HTOBE64(x) _byteswap_uint64(x)
# else
// GCC and Clang:
# define BASE64_HTOBE32(x) __builtin_bswap32(x)
# define BASE64_HTOBE64(x) __builtin_bswap64(x)
# endif
#else
// No conversion needed:
# define BASE64_HTOBE32(x) (x)
# define BASE64_HTOBE64(x) (x)
#endif
// Detect word size:
#if defined (__x86_64__)
// This also works for the x32 ABI, which has a 64-bit word size.
# define BASE64_WORDSIZE 64
#elif SIZE_MAX == UINT32_MAX
# define BASE64_WORDSIZE 32
#elif SIZE_MAX == UINT64_MAX
# define BASE64_WORDSIZE 64
#else
# error BASE64_WORDSIZE_NOT_DEFINED
#endif
// End-of-file definitions.
// Almost end-of-file when waiting for the last '=' character:
#define BASE64_AEOF 1
// End-of-file when stream end has been reached or invalid input provided:
#define BASE64_EOF 2
// GCC 7 defaults to issuing a warning for fallthrough in switch statements,
// unless the fallthrough cases are marked with an attribute. As we use
// fallthrough deliberately, define an alias for the attribute:
#if __GNUC__ >= 7
# define BASE64_FALLTHROUGH __attribute__((fallthrough));
#else
# define BASE64_FALLTHROUGH
#endif
// Declare macros to ensure that functions that are intended to be inlined, are
// actually inlined, even when no optimization is applied. A lot of inner loop
// code is factored into separate functions for reasons of readability, but
// that code should always be inlined (and optimized) in the main loop.
#ifdef _MSC_VER
# define BASE64_FORCE_INLINE __forceinline
#else
# define BASE64_FORCE_INLINE inline __attribute__((always_inline))
#endif
#endif // BASE64_ENV_H
|
