Mercurial > sdl-ios-xcode
annotate include/SDL_rwops.h @ 1356:67114343400d
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 10 Feb 2006 03:19:02 +0000 |
| parents | 22f39393668a |
| children | c71e05b4dc2e |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
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6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 9 |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
|
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13 Lesser General Public License for more details. |
| 0 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 /* This file provides a general interface for SDL to read and write | |
| 24 data sources. It can easily be extended to files, memory, etc. | |
| 25 */ | |
| 26 | |
| 27 #ifndef _SDL_RWops_h | |
| 28 #define _SDL_RWops_h | |
| 29 | |
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30 #include "SDL_stdinc.h" |
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31 |
| 0 | 32 #include "begin_code.h" |
| 33 /* Set up for C function definitions, even when using C++ */ | |
| 34 #ifdef __cplusplus | |
| 35 extern "C" { | |
| 36 #endif | |
| 37 | |
| 38 /* This is the read/write operation structure -- very basic */ | |
| 39 | |
| 40 typedef struct SDL_RWops { | |
| 41 /* Seek to 'offset' relative to whence, one of stdio's whence values: | |
| 42 SEEK_SET, SEEK_CUR, SEEK_END | |
| 43 Returns the final offset in the data source. | |
| 44 */ | |
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45 int (SDLCALL *seek)(struct SDL_RWops *context, int offset, int whence); |
| 0 | 46 |
| 47 /* Read up to 'num' objects each of size 'objsize' from the data | |
| 48 source to the area pointed at by 'ptr'. | |
| 49 Returns the number of objects read, or -1 if the read failed. | |
| 50 */ | |
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51 int (SDLCALL *read)(struct SDL_RWops *context, void *ptr, int size, int maxnum); |
| 0 | 52 |
| 53 /* Write exactly 'num' objects each of size 'objsize' from the area | |
| 54 pointed at by 'ptr' to data source. | |
| 55 Returns 'num', or -1 if the write failed. | |
| 56 */ | |
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57 int (SDLCALL *write)(struct SDL_RWops *context, const void *ptr, int size, int num); |
| 0 | 58 |
| 59 /* Close and free an allocated SDL_FSops structure */ | |
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60 int (SDLCALL *close)(struct SDL_RWops *context); |
| 0 | 61 |
| 62 Uint32 type; | |
| 63 union { | |
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64 #ifdef HAVE_STDIO_H |
| 0 | 65 struct { |
| 66 int autoclose; | |
| 67 FILE *fp; | |
| 68 } stdio; | |
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69 #endif |
| 0 | 70 struct { |
| 71 Uint8 *base; | |
| 72 Uint8 *here; | |
| 73 Uint8 *stop; | |
| 74 } mem; | |
| 75 struct { | |
| 76 void *data1; | |
| 77 } unknown; | |
| 78 } hidden; | |
| 79 | |
| 80 } SDL_RWops; | |
| 81 | |
| 82 | |
| 83 /* Functions to create SDL_RWops structures from various data sources */ | |
| 84 | |
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85 extern DECLSPEC SDL_RWops * SDLCALL SDL_RWFromFile(const char *file, const char *mode); |
| 0 | 86 |
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87 #ifdef HAVE_STDIO_H |
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88 extern DECLSPEC SDL_RWops * SDLCALL SDL_RWFromFP(FILE *fp, int autoclose); |
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89 #endif |
| 0 | 90 |
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91 extern DECLSPEC SDL_RWops * SDLCALL SDL_RWFromMem(void *mem, int size); |
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92 extern DECLSPEC SDL_RWops * SDLCALL SDL_RWFromConstMem(const void *mem, int size); |
| 0 | 93 |
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94 extern DECLSPEC SDL_RWops * SDLCALL SDL_AllocRW(void); |
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95 extern DECLSPEC void SDLCALL SDL_FreeRW(SDL_RWops *area); |
| 0 | 96 |
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97 #define RW_SEEK_SET 0 /* Seek from the beginning of data */ |
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98 #define RW_SEEK_CUR 1 /* Seek relative to current read point */ |
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99 #define RW_SEEK_END 2 /* Seek relative to the end of data */ |
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100 |
| 0 | 101 /* Macros to easily read and write from an SDL_RWops structure */ |
| 102 #define SDL_RWseek(ctx, offset, whence) (ctx)->seek(ctx, offset, whence) | |
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103 #define SDL_RWtell(ctx) (ctx)->seek(ctx, 0, RW_SEEK_CUR) |
| 0 | 104 #define SDL_RWread(ctx, ptr, size, n) (ctx)->read(ctx, ptr, size, n) |
| 105 #define SDL_RWwrite(ctx, ptr, size, n) (ctx)->write(ctx, ptr, size, n) | |
| 106 #define SDL_RWclose(ctx) (ctx)->close(ctx) | |
| 107 | |
| 108 | |
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109 /* Read an item of the specified endianness and return in native format */ |
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110 extern DECLSPEC Uint16 SDLCALL SDL_ReadLE16(SDL_RWops *src); |
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111 extern DECLSPEC Uint16 SDLCALL SDL_ReadBE16(SDL_RWops *src); |
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112 extern DECLSPEC Uint32 SDLCALL SDL_ReadLE32(SDL_RWops *src); |
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113 extern DECLSPEC Uint32 SDLCALL SDL_ReadBE32(SDL_RWops *src); |
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114 extern DECLSPEC Uint64 SDLCALL SDL_ReadLE64(SDL_RWops *src); |
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115 extern DECLSPEC Uint64 SDLCALL SDL_ReadBE64(SDL_RWops *src); |
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116 |
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117 /* Write an item of native format to the specified endianness */ |
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118 extern DECLSPEC int SDLCALL SDL_WriteLE16(SDL_RWops *dst, Uint16 value); |
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119 extern DECLSPEC int SDLCALL SDL_WriteBE16(SDL_RWops *dst, Uint16 value); |
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120 extern DECLSPEC int SDLCALL SDL_WriteLE32(SDL_RWops *dst, Uint32 value); |
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121 extern DECLSPEC int SDLCALL SDL_WriteBE32(SDL_RWops *dst, Uint32 value); |
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122 extern DECLSPEC int SDLCALL SDL_WriteLE64(SDL_RWops *dst, Uint64 value); |
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123 extern DECLSPEC int SDLCALL SDL_WriteBE64(SDL_RWops *dst, Uint64 value); |
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124 |
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125 |
| 0 | 126 /* Ends C function definitions when using C++ */ |
| 127 #ifdef __cplusplus | |
| 128 } | |
| 129 #endif | |
| 130 #include "close_code.h" | |
| 131 | |
| 132 #endif /* _SDL_RWops_h */ |