Mercurial > sdl-ios-xcode
annotate include/SDL_rwops.h @ 1339:62802d9d7c87
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 07 Feb 2006 10:40:14 +0000 |
| parents | 450721ad5436 |
| children | 22f39393668a |
| 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_config.h" |
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31 |
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32 #ifdef HAVE_STDIO_H |
| 0 | 33 #include <stdio.h> |
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34 #endif |
| 0 | 35 |
| 36 #include "SDL_types.h" | |
| 37 | |
| 38 #include "begin_code.h" | |
| 39 /* Set up for C function definitions, even when using C++ */ | |
| 40 #ifdef __cplusplus | |
| 41 extern "C" { | |
| 42 #endif | |
| 43 | |
| 44 /* This is the read/write operation structure -- very basic */ | |
| 45 | |
| 46 typedef struct SDL_RWops { | |
| 47 /* Seek to 'offset' relative to whence, one of stdio's whence values: | |
| 48 SEEK_SET, SEEK_CUR, SEEK_END | |
| 49 Returns the final offset in the data source. | |
| 50 */ | |
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51 int (SDLCALL *seek)(struct SDL_RWops *context, int offset, int whence); |
| 0 | 52 |
| 53 /* Read up to 'num' objects each of size 'objsize' from the data | |
| 54 source to the area pointed at by 'ptr'. | |
| 55 Returns the number of objects read, or -1 if the read failed. | |
| 56 */ | |
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57 int (SDLCALL *read)(struct SDL_RWops *context, void *ptr, int size, int maxnum); |
| 0 | 58 |
| 59 /* Write exactly 'num' objects each of size 'objsize' from the area | |
| 60 pointed at by 'ptr' to data source. | |
| 61 Returns 'num', or -1 if the write failed. | |
| 62 */ | |
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63 int (SDLCALL *write)(struct SDL_RWops *context, const void *ptr, int size, int num); |
| 0 | 64 |
| 65 /* Close and free an allocated SDL_FSops structure */ | |
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66 int (SDLCALL *close)(struct SDL_RWops *context); |
| 0 | 67 |
| 68 Uint32 type; | |
| 69 union { | |
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70 #ifdef HAVE_STDIO_H |
| 0 | 71 struct { |
| 72 int autoclose; | |
| 73 FILE *fp; | |
| 74 } stdio; | |
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75 #endif |
| 0 | 76 struct { |
| 77 Uint8 *base; | |
| 78 Uint8 *here; | |
| 79 Uint8 *stop; | |
| 80 } mem; | |
| 81 struct { | |
| 82 void *data1; | |
| 83 } unknown; | |
| 84 } hidden; | |
| 85 | |
| 86 } SDL_RWops; | |
| 87 | |
| 88 | |
| 89 /* Functions to create SDL_RWops structures from various data sources */ | |
| 90 | |
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91 extern DECLSPEC SDL_RWops * SDLCALL SDL_RWFromFile(const char *file, const char *mode); |
| 0 | 92 |
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93 #ifdef HAVE_STDIO_H |
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94 extern DECLSPEC SDL_RWops * SDLCALL SDL_RWFromFP(FILE *fp, int autoclose); |
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95 #endif |
| 0 | 96 |
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97 extern DECLSPEC SDL_RWops * SDLCALL SDL_RWFromMem(void *mem, int size); |
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98 extern DECLSPEC SDL_RWops * SDLCALL SDL_RWFromConstMem(const void *mem, int size); |
| 0 | 99 |
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100 extern DECLSPEC SDL_RWops * SDLCALL SDL_AllocRW(void); |
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101 extern DECLSPEC void SDLCALL SDL_FreeRW(SDL_RWops *area); |
| 0 | 102 |
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parents:
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103 #define RW_SEEK_SET 0 /* Seek from the beginning of data */ |
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450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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diff
changeset
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104 #define RW_SEEK_CUR 1 /* Seek relative to current read point */ |
|
450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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diff
changeset
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105 #define RW_SEEK_END 2 /* Seek relative to the end of data */ |
|
450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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diff
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106 |
| 0 | 107 /* Macros to easily read and write from an SDL_RWops structure */ |
| 108 #define SDL_RWseek(ctx, offset, whence) (ctx)->seek(ctx, offset, whence) | |
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Sam Lantinga <slouken@libsdl.org>
parents:
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109 #define SDL_RWtell(ctx) (ctx)->seek(ctx, 0, RW_SEEK_CUR) |
| 0 | 110 #define SDL_RWread(ctx, ptr, size, n) (ctx)->read(ctx, ptr, size, n) |
| 111 #define SDL_RWwrite(ctx, ptr, size, n) (ctx)->write(ctx, ptr, size, n) | |
| 112 #define SDL_RWclose(ctx) (ctx)->close(ctx) | |
| 113 | |
| 114 | |
| 115 /* Ends C function definitions when using C++ */ | |
| 116 #ifdef __cplusplus | |
| 117 } | |
| 118 #endif | |
| 119 #include "close_code.h" | |
| 120 | |
| 121 #endif /* _SDL_RWops_h */ |