Mercurial > sdl-ios-xcode
annotate include/SDL_rwops.h @ 4088:cbe2f23a1c2b SDL-1.2
Fixed window titles on Windows 95/98/ME
author | Sam Lantinga <slouken@libsdl.org> |
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date | Mon, 23 Jul 2007 01:19:56 +0000 |
parents | 255b0469ca83 |
children | a1b03ba2fcd0 |
rev | line source |
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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 | |
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27 #ifndef _SDL_rwops_h |
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28 #define _SDL_rwops_h |
0 | 29 |
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30 #include "SDL_stdinc.h" |
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31 #include "SDL_error.h" |
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32 |
0 | 33 #include "begin_code.h" |
34 /* Set up for C function definitions, even when using C++ */ | |
35 #ifdef __cplusplus | |
36 extern "C" { | |
37 #endif | |
38 | |
39 /* This is the read/write operation structure -- very basic */ | |
40 | |
41 typedef struct SDL_RWops { | |
42 /* Seek to 'offset' relative to whence, one of stdio's whence values: | |
43 SEEK_SET, SEEK_CUR, SEEK_END | |
44 Returns the final offset in the data source. | |
45 */ | |
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46 int (SDLCALL *seek)(struct SDL_RWops *context, int offset, int whence); |
0 | 47 |
48 /* Read up to 'num' objects each of size 'objsize' from the data | |
49 source to the area pointed at by 'ptr'. | |
50 Returns the number of objects read, or -1 if the read failed. | |
51 */ | |
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52 int (SDLCALL *read)(struct SDL_RWops *context, void *ptr, int size, int maxnum); |
0 | 53 |
54 /* Write exactly 'num' objects each of size 'objsize' from the area | |
55 pointed at by 'ptr' to data source. | |
56 Returns 'num', or -1 if the write failed. | |
57 */ | |
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58 int (SDLCALL *write)(struct SDL_RWops *context, const void *ptr, int size, int num); |
0 | 59 |
60 /* Close and free an allocated SDL_FSops structure */ | |
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61 int (SDLCALL *close)(struct SDL_RWops *context); |
0 | 62 |
63 Uint32 type; | |
64 union { | |
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65 #if defined(__WIN32__) && !defined(__SYMBIAN32__) |
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66 struct { |
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67 int append; |
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68 void *h; |
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69 struct { |
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70 void *data; |
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71 int size; |
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72 int left; |
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73 } buffer; |
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74 } win32io; |
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75 #endif |
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76 #ifdef HAVE_STDIO_H |
0 | 77 struct { |
78 int autoclose; | |
79 FILE *fp; | |
80 } stdio; | |
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81 #endif |
0 | 82 struct { |
83 Uint8 *base; | |
84 Uint8 *here; | |
85 Uint8 *stop; | |
86 } mem; | |
87 struct { | |
88 void *data1; | |
89 } unknown; | |
90 } hidden; | |
91 | |
92 } SDL_RWops; | |
93 | |
94 | |
95 /* Functions to create SDL_RWops structures from various data sources */ | |
96 | |
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97 extern DECLSPEC SDL_RWops * SDLCALL SDL_RWFromFile(const char *file, const char *mode); |
0 | 98 |
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99 #ifdef HAVE_STDIO_H |
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100 extern DECLSPEC SDL_RWops * SDLCALL SDL_RWFromFP(FILE *fp, int autoclose); |
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101 #endif |
0 | 102 |
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103 extern DECLSPEC SDL_RWops * SDLCALL SDL_RWFromMem(void *mem, int size); |
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104 extern DECLSPEC SDL_RWops * SDLCALL SDL_RWFromConstMem(const void *mem, int size); |
0 | 105 |
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106 extern DECLSPEC SDL_RWops * SDLCALL SDL_AllocRW(void); |
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107 extern DECLSPEC void SDLCALL SDL_FreeRW(SDL_RWops *area); |
0 | 108 |
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109 #define RW_SEEK_SET 0 /* Seek from the beginning of data */ |
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110 #define RW_SEEK_CUR 1 /* Seek relative to current read point */ |
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111 #define RW_SEEK_END 2 /* Seek relative to the end of data */ |
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112 |
0 | 113 /* Macros to easily read and write from an SDL_RWops structure */ |
114 #define SDL_RWseek(ctx, offset, whence) (ctx)->seek(ctx, offset, whence) | |
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115 #define SDL_RWtell(ctx) (ctx)->seek(ctx, 0, RW_SEEK_CUR) |
0 | 116 #define SDL_RWread(ctx, ptr, size, n) (ctx)->read(ctx, ptr, size, n) |
117 #define SDL_RWwrite(ctx, ptr, size, n) (ctx)->write(ctx, ptr, size, n) | |
118 #define SDL_RWclose(ctx) (ctx)->close(ctx) | |
119 | |
120 | |
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121 /* Read an item of the specified endianness and return in native format */ |
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122 extern DECLSPEC Uint16 SDLCALL SDL_ReadLE16(SDL_RWops *src); |
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123 extern DECLSPEC Uint16 SDLCALL SDL_ReadBE16(SDL_RWops *src); |
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124 extern DECLSPEC Uint32 SDLCALL SDL_ReadLE32(SDL_RWops *src); |
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125 extern DECLSPEC Uint32 SDLCALL SDL_ReadBE32(SDL_RWops *src); |
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126 extern DECLSPEC Uint64 SDLCALL SDL_ReadLE64(SDL_RWops *src); |
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127 extern DECLSPEC Uint64 SDLCALL SDL_ReadBE64(SDL_RWops *src); |
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128 |
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129 /* Write an item of native format to the specified endianness */ |
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130 extern DECLSPEC int SDLCALL SDL_WriteLE16(SDL_RWops *dst, Uint16 value); |
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131 extern DECLSPEC int SDLCALL SDL_WriteBE16(SDL_RWops *dst, Uint16 value); |
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132 extern DECLSPEC int SDLCALL SDL_WriteLE32(SDL_RWops *dst, Uint32 value); |
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133 extern DECLSPEC int SDLCALL SDL_WriteBE32(SDL_RWops *dst, Uint32 value); |
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134 extern DECLSPEC int SDLCALL SDL_WriteLE64(SDL_RWops *dst, Uint64 value); |
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135 extern DECLSPEC int SDLCALL SDL_WriteBE64(SDL_RWops *dst, Uint64 value); |
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136 |
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137 |
0 | 138 /* Ends C function definitions when using C++ */ |
139 #ifdef __cplusplus | |
140 } | |
141 #endif | |
142 #include "close_code.h" | |
143 | |
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144 #endif /* _SDL_rwops_h */ |