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1 #ifndef ALMIXER_RWOPS
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2 #define ALMIXER_RWOPS
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3
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4 #if defined(_WIN32)
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5 #if defined(ALMIXER_RWOPS_BUILD_LIBRARY)
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6 #define ALMIXER_RWOPS_DECLSPEC __declspec(dllexport)
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7 #else
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8 #define ALMIXER_RWOPS_DECLSPEC __declspec(dllimport)
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9 #endif
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10 #else
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11 #if defined(ALMIXER_RWOPS_BUILD_LIBRARY)
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12 #if defined (__GNUC__) && __GNUC__ >= 4
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13 #define ALMIXER_RWOPS_DECLSPEC __attribute__((visibility("default")))
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14 #else
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15 #define ALMIXER_RWOPS_DECLSPEC
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16 #endif
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17 #else
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18 #define ALMIXER_RWOPS_DECLSPEC
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19 #endif
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20 #endif
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21
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22 #if defined(_WIN32)
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23 #define ALMIXER_RWOPS_CALL __cdecl
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24 #else
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25 #define ALMIXER_RWOPS_CALL
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26 #endif
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27
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28 #ifdef __cplusplus
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29 extern "C" {
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30 #endif
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31
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32 /* Trying to keep compatibility with SDL_RWops,
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33 * but I don't plan on reimplementing everything.
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34 */
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35 #include <stdio.h>
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36 #include <stddef.h>
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37 /* The 'type' parameter needs to be 32-bits to match SDL_RWops.
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38 * <stdint.h> has been problematic for Visual Studio for years.
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39 * It appears that Visual Studio 2010 finally includes this.
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40 */
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41 #include <stdint.h>
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42 typedef struct ALmixer_RWops
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43 {
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44 /** Seek to 'offset' relative to whence, one of stdio's whence values:
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45 * SEEK_SET, SEEK_CUR, SEEK_END
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46 * Returns the final offset in the data source.
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47 * (Note this is different than stdio's seek. This returns ftell.)
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48 */
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49 int (ALMIXER_RWOPS_CALL *seek)(struct ALmixer_RWops* the_context, long offset, int whence);
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50
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51 /** Read up to 'nitems' objects each of size 'size' from the data
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52 * source to the area pointed at by 'ptr'.
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53 * Returns the number of objects read, or -1 if the read failed.
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54 */
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55 size_t (ALMIXER_RWOPS_CALL *read)(struct ALmixer_RWops* the_context, void* ptr, size_t size, size_t nitems);
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56
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57 /** Write exactly 'nitems' objects each of size 'size' from the area
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58 * pointed at by 'ptr' to data source.
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59 * Returns 'num', or -1 if the write failed.
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60 */
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61 size_t (ALMIXER_RWOPS_CALL *write)(struct ALmixer_RWops* the_context, const void* ptr, size_t size, size_t nitems);
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62
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63 /** Close and free an allocated ALmixer_RWops structure */
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64 int (ALMIXER_RWOPS_CALL *close)(struct ALmixer_RWops* the_context);
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65
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66 /* type Needs to be a 32-bit to be compatible with SDL */
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67 uint32_t type;
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68 union
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69 {
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70 #if defined(__WIN32__) && !defined(__SYMBIAN32__)
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71 /* Chances are that I will not implement this path.
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72 * But I want the padding to be the same as SDL.
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73 */
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74 struct
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75 {
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76 int append;
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77 void *h;
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78 struct
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79 {
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80 void *data;
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81 int size;
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82 int left;
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83 } buffer;
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84 } win32io;
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85 #endif
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86 struct
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87 {
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88 int autoclose;
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89 FILE* fp;
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90 } stdio;
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91 struct
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92 {
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93 unsigned char* base;
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94 unsigned char* here;
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95 unsigned char* stop;
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96 } mem;
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97 struct
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98 {
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99 void* data1;
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100 } unknown;
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101 } hidden;
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102 } ALmixer_RWops;
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103
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104 extern ALMIXER_RWOPS_DECLSPEC ALmixer_RWops* ALMIXER_RWOPS_CALL ALmixer_RWFromFile(const char* file_name, const char* file_mode);
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105 extern ALMIXER_RWOPS_DECLSPEC ALmixer_RWops* ALMIXER_RWOPS_CALL ALmixer_RWFromFP(FILE* file_pointer, char autoclose_flag);
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106
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107 #define ALmixer_RWseek(rwops, offset, whence) (rwops)->seek(rwops, offset, whence)
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108 #define ALmixer_RWtell(rwops) (rwops)->seek(rwops, 0, SEEK_CUR)
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109 #define ALmixer_RWread(rwops, ptr, size, nitems) (rwops)->read(rwops, ptr, size, nitems)
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110
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111 /* Ends C function definitions when using C++ */
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112 #ifdef __cplusplus
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113 }
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114 #endif
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115
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116 #endif
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117
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