Mercurial > sdl-ios-xcode
annotate include/SDL_rwops.h @ 4803:a4c1df880690
Added code to make testshape switch shapes on keystrokes and exit on an ESC keystroke.
author | Eli Gottlieb <eligottlieb@gmail.com> |
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date | Sun, 18 Jul 2010 23:36:39 -0400 |
parents | f7b03b6838cb |
children | ebcb4988b16f |
rev | line source |
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0 | 1 /* |
2 SDL - Simple DirectMedia Layer | |
3697 | 3 Copyright (C) 1997-2010 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 | |
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23 /** |
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24 * \file SDL_rwops.h |
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25 * |
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26 * This file provides a general interface for SDL to read and write |
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27 * data sources. It can easily be extended to files, memory, etc. |
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28 */ |
0 | 29 |
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30 #ifndef _SDL_rwops_h |
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31 #define _SDL_rwops_h |
0 | 32 |
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33 #include "SDL_stdinc.h" |
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34 #include "SDL_error.h" |
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35 |
0 | 36 #include "begin_code.h" |
37 /* Set up for C function definitions, even when using C++ */ | |
38 #ifdef __cplusplus | |
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39 /* *INDENT-OFF* */ |
0 | 40 extern "C" { |
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41 /* *INDENT-ON* */ |
0 | 42 #endif |
43 | |
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44 /** |
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45 * This is the read/write operation structure -- very basic. |
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46 */ |
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47 typedef struct SDL_RWops |
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48 { |
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49 /** |
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50 * Seek to \c offset relative to \c whence, one of stdio's whence values: |
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51 * RW_SEEK_SET, RW_SEEK_CUR, RW_SEEK_END |
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52 * |
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53 * \return the final offset in the data source. |
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54 */ |
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55 long (SDLCALL * seek) (struct SDL_RWops * context, long offset, |
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56 int whence); |
0 | 57 |
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58 /** |
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59 * Read up to \c maxnum objects each of size \c size from the data |
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60 * source to the area pointed at by \c ptr. |
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61 * |
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62 * \return the number of objects read, or 0 at error or end of file. |
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63 */ |
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64 size_t(SDLCALL * read) (struct SDL_RWops * context, void *ptr, |
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65 size_t size, size_t maxnum); |
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67 /** |
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68 * Write exactly \c num objects each of size \c objsize from the area |
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69 * pointed at by \c ptr to data source. |
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70 * |
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71 * \return the number of objects written, or 0 at error or end of file. |
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72 */ |
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73 size_t(SDLCALL * write) (struct SDL_RWops * context, const void *ptr, |
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74 size_t size, size_t num); |
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76 /** |
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77 * Close and free an allocated SDL_RWops structure. |
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78 * |
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79 * \return 0 if successful or -1 on write error when flushing data. |
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80 */ |
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81 int (SDLCALL * close) (struct SDL_RWops * context); |
0 | 82 |
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83 Uint32 type; |
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84 union |
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85 { |
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86 #ifdef __WIN32__ |
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87 struct |
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88 { |
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89 SDL_bool append; |
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90 void *h; |
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91 struct |
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92 { |
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93 void *data; |
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94 size_t size; |
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95 size_t left; |
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96 } buffer; |
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97 } win32io; |
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98 #endif |
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99 #ifdef HAVE_STDIO_H |
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100 struct |
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101 { |
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102 SDL_bool autoclose; |
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103 FILE *fp; |
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104 } stdio; |
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105 #endif |
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106 struct |
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107 { |
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108 Uint8 *base; |
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109 Uint8 *here; |
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110 Uint8 *stop; |
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111 } mem; |
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112 struct |
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113 { |
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114 void *data1; |
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115 } unknown; |
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116 } hidden; |
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118 } SDL_RWops; | |
119 | |
120 | |
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121 /** |
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122 * \name RWFrom functions |
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123 * |
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124 * Functions to create SDL_RWops structures from various data sources. |
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125 */ |
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126 /*@{*/ |
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128 extern DECLSPEC SDL_RWops *SDLCALL SDL_RWFromFile(const char *file, |
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129 const char *mode); |
0 | 130 |
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131 #ifdef HAVE_STDIO_H |
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132 extern DECLSPEC SDL_RWops *SDLCALL SDL_RWFromFP(FILE * fp, |
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133 SDL_bool autoclose); |
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134 #else |
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135 extern DECLSPEC SDL_RWops *SDLCALL SDL_RWFromFP(void * fp, |
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136 SDL_bool autoclose); |
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137 #endif |
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139 extern DECLSPEC SDL_RWops *SDLCALL SDL_RWFromMem(void *mem, int size); |
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140 extern DECLSPEC SDL_RWops *SDLCALL SDL_RWFromConstMem(const void *mem, |
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141 int size); |
0 | 142 |
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143 /*@}*//*RWFrom functions*/ |
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144 |
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145 |
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146 extern DECLSPEC SDL_RWops *SDLCALL SDL_AllocRW(void); |
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147 extern DECLSPEC void SDLCALL SDL_FreeRW(SDL_RWops * area); |
0 | 148 |
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149 #define RW_SEEK_SET 0 /**< Seek from the beginning of data */ |
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150 #define RW_SEEK_CUR 1 /**< Seek relative to current read point */ |
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151 #define RW_SEEK_END 2 /**< Seek relative to the end of data */ |
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152 |
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153 /** |
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154 * \name Read/write macros |
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155 * |
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156 * Macros to easily read and write from an SDL_RWops structure. |
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157 */ |
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158 /*@{*/ |
0 | 159 #define SDL_RWseek(ctx, offset, whence) (ctx)->seek(ctx, offset, whence) |
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160 #define SDL_RWtell(ctx) (ctx)->seek(ctx, 0, RW_SEEK_CUR) |
0 | 161 #define SDL_RWread(ctx, ptr, size, n) (ctx)->read(ctx, ptr, size, n) |
162 #define SDL_RWwrite(ctx, ptr, size, n) (ctx)->write(ctx, ptr, size, n) | |
163 #define SDL_RWclose(ctx) (ctx)->close(ctx) | |
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164 /*@}*//*Read/write macros*/ |
0 | 165 |
166 | |
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167 /** |
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168 * \name Read endian functions |
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169 * |
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170 * Read an item of the specified endianness and return in native format. |
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171 */ |
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172 /*@{*/ |
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173 extern DECLSPEC Uint16 SDLCALL SDL_ReadLE16(SDL_RWops * src); |
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174 extern DECLSPEC Uint16 SDLCALL SDL_ReadBE16(SDL_RWops * src); |
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175 extern DECLSPEC Uint32 SDLCALL SDL_ReadLE32(SDL_RWops * src); |
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176 extern DECLSPEC Uint32 SDLCALL SDL_ReadBE32(SDL_RWops * src); |
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177 extern DECLSPEC Uint64 SDLCALL SDL_ReadLE64(SDL_RWops * src); |
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178 extern DECLSPEC Uint64 SDLCALL SDL_ReadBE64(SDL_RWops * src); |
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179 /*@}*//*Read endian functions*/ |
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180 |
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181 /** |
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182 * \name Write endian functions |
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183 * |
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184 * Write an item of native format to the specified endianness. |
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185 */ |
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186 /*@{*/ |
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187 extern DECLSPEC size_t SDLCALL SDL_WriteLE16(SDL_RWops * dst, Uint16 value); |
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188 extern DECLSPEC size_t SDLCALL SDL_WriteBE16(SDL_RWops * dst, Uint16 value); |
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189 extern DECLSPEC size_t SDLCALL SDL_WriteLE32(SDL_RWops * dst, Uint32 value); |
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190 extern DECLSPEC size_t SDLCALL SDL_WriteBE32(SDL_RWops * dst, Uint32 value); |
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191 extern DECLSPEC size_t SDLCALL SDL_WriteLE64(SDL_RWops * dst, Uint64 value); |
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192 extern DECLSPEC size_t SDLCALL SDL_WriteBE64(SDL_RWops * dst, Uint64 value); |
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193 /*@}*//*Write endian functions*/ |
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194 |
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195 |
0 | 196 /* Ends C function definitions when using C++ */ |
197 #ifdef __cplusplus | |
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198 /* *INDENT-OFF* */ |
0 | 199 } |
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200 /* *INDENT-ON* */ |
0 | 201 #endif |
202 #include "close_code.h" | |
203 | |
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204 #endif /* _SDL_rwops_h */ |
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205 |
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206 /* vi: set ts=4 sw=4 expandtab: */ |