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annotate include/SDL_rwops.h @ 3235:d35b649858e0

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David Carre to Sam Hello sam, me again. I'v fixed another bug in the pandora code, it's on the no-X videodriver, i forgot to add some code to destroy the window so it was impossible to reload SDL inside the same application (eglTerminate). You'll find the svn diff attached. See you, David.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 11 Aug 2009 13:45:01 +0000
parents 99210400e8b9
children 5d7ef5970073
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 Sam Lantinga
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4
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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
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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.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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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
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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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 */
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29
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30 #ifndef _SDL_rwops_h
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31 #define _SDL_rwops_h
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32
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33 #include "SDL_stdinc.h"
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34 #include "SDL_error.h"
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35
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36 #include "begin_code.h"
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37 /* Set up for C function definitions, even when using C++ */
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38 #ifdef __cplusplus
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39 /* *INDENT-OFF* */
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40 extern "C" {
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41 /* *INDENT-ON* */
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42 #endif
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43
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44 /* This is the read/write operation structure -- very basic */
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45
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46 typedef struct SDL_RWops
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47 {
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48 /* Seek to 'offset' relative to whence, one of stdio's whence values:
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49 RW_SEEK_SET, RW_SEEK_CUR, RW_SEEK_END
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50 Returns the final offset in the data source.
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51 */
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52 long (SDLCALL * seek) (struct SDL_RWops * context, long offset,
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53 int whence);
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54
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55 /* Read up to 'num' objects each of size 'objsize' from the data
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56 source to the area pointed at by 'ptr'.
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57 Returns the number of objects read, or 0 at error or end of file.
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58 */
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59 size_t(SDLCALL * read) (struct SDL_RWops * context, void *ptr,
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60 size_t size, size_t maxnum);
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61
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62 /* Write exactly 'num' objects each of size 'objsize' from the area
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63 pointed at by 'ptr' to data source.
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64 Returns the number of objects written, or 0 at error or end of file.
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65 */
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66 size_t(SDLCALL * write) (struct SDL_RWops * context, const void *ptr,
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67 size_t size, size_t num);
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68
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69 /* Close and free an allocated SDL_RWops structure.
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70 Returns 0 if successful or -1 on write error when flushing data.
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71 */
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72 int (SDLCALL * close) (struct SDL_RWops * context);
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73
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74 Uint32 type;
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75 union
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76 {
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77 #ifdef __WIN32__
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78 struct
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79 {
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80 SDL_bool append;
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81 void *h;
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82 struct
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83 {
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84 void *data;
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85 int size;
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86 int left;
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87 } buffer;
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88 } win32io;
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89 #endif
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90 #ifdef HAVE_STDIO_H
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91 struct
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92 {
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93 SDL_bool autoclose;
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94 FILE *fp;
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95 } stdio;
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96 #endif
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97 struct
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98 {
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99 Uint8 *base;
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100 Uint8 *here;
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101 Uint8 *stop;
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102 } mem;
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103 struct
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104 {
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105 void *data1;
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106 } unknown;
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107 } hidden;
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108
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109 } SDL_RWops;
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110
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111
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112 /* Functions to create SDL_RWops structures from various data sources */
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113
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114 extern DECLSPEC SDL_RWops *SDLCALL SDL_RWFromFile(const char *file,
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115 const char *mode);
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116
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117 #ifdef HAVE_STDIO_H
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118 extern DECLSPEC SDL_RWops *SDLCALL SDL_RWFromFP(FILE * fp,
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119 SDL_bool autoclose);
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120 #endif
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121
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122 extern DECLSPEC SDL_RWops *SDLCALL SDL_RWFromMem(void *mem, int size);
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123 extern DECLSPEC SDL_RWops *SDLCALL SDL_RWFromConstMem(const void *mem,
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124 int size);
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125
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126 extern DECLSPEC SDL_RWops *SDLCALL SDL_AllocRW(void);
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127 extern DECLSPEC void SDLCALL SDL_FreeRW(SDL_RWops * area);
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128
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129 #define RW_SEEK_SET 0 /* Seek from the beginning of data */
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130 #define RW_SEEK_CUR 1 /* Seek relative to current read point */
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131 #define RW_SEEK_END 2 /* Seek relative to the end of data */
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132
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133 /* Macros to easily read and write from an SDL_RWops structure */
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134 #define SDL_RWseek(ctx, offset, whence) (ctx)->seek(ctx, offset, whence)
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135 #define SDL_RWtell(ctx) (ctx)->seek(ctx, 0, RW_SEEK_CUR)
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136 #define SDL_RWread(ctx, ptr, size, n) (ctx)->read(ctx, ptr, size, n)
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137 #define SDL_RWwrite(ctx, ptr, size, n) (ctx)->write(ctx, ptr, size, n)
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138 #define SDL_RWclose(ctx) (ctx)->close(ctx)
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139
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140
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141 /* Read an item of the specified endianness and return in native format */
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142 extern DECLSPEC Uint16 SDLCALL SDL_ReadLE16(SDL_RWops * src);
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143 extern DECLSPEC Uint16 SDLCALL SDL_ReadBE16(SDL_RWops * src);
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144 extern DECLSPEC Uint32 SDLCALL SDL_ReadLE32(SDL_RWops * src);
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145 extern DECLSPEC Uint32 SDLCALL SDL_ReadBE32(SDL_RWops * src);
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146 extern DECLSPEC Uint64 SDLCALL SDL_ReadLE64(SDL_RWops * src);
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147 extern DECLSPEC Uint64 SDLCALL SDL_ReadBE64(SDL_RWops * src);
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148
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149 /* Write an item of native format to the specified endianness */
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150 extern DECLSPEC int SDLCALL SDL_WriteLE16(SDL_RWops * dst, Uint16 value);
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151 extern DECLSPEC int SDLCALL SDL_WriteBE16(SDL_RWops * dst, Uint16 value);
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152 extern DECLSPEC int SDLCALL SDL_WriteLE32(SDL_RWops * dst, Uint32 value);
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153 extern DECLSPEC int SDLCALL SDL_WriteBE32(SDL_RWops * dst, Uint32 value);
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154 extern DECLSPEC int SDLCALL SDL_WriteLE64(SDL_RWops * dst, Uint64 value);
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155 extern DECLSPEC int SDLCALL SDL_WriteBE64(SDL_RWops * dst, Uint64 value);
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156
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157
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158 /* Ends C function definitions when using C++ */
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159 #ifdef __cplusplus
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160 /* *INDENT-OFF* */
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161 }
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162 /* *INDENT-ON* */
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163 #endif
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164 #include "close_code.h"
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165
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166 #endif /* _SDL_rwops_h */
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167
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168 /* vi: set ts=4 sw=4 expandtab: */