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annotate include/SDL_rwops.h @ 5230:5d01d426f2ea

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It's now possible to disable the fast atomic operations, at a huge performance penalty.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 07 Feb 2011 22:57:33 -0800
parents c2539ff054c8
children b530ef003506
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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 streams. 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 /**
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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 stream.
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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);
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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 * stream 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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66
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67 /**
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68 * Write exactly \c num objects each of size \c size from the area
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69 * pointed at by \c ptr to data stream.
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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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75
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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);
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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 } windowsio;
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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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117
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118 } SDL_RWops;
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119
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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 streams.
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125 */
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126 /*@{*/
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127
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128 extern DECLSPEC SDL_RWops *SDLCALL SDL_RWFromFile(const char *file,
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129 const char *mode);
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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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138
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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);
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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);
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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 /*@{*/
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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)
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161 #define SDL_RWread(ctx, ptr, size, n) (ctx)->read(ctx, ptr, size, n)
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162 #define SDL_RWwrite(ctx, ptr, size, n) (ctx)->write(ctx, ptr, size, n)
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163 #define SDL_RWclose(ctx) (ctx)->close(ctx)
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164 /*@}*//*Read/write macros*/
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165
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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
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196 /* Ends C function definitions when using C++ */
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197 #ifdef __cplusplus
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198 /* *INDENT-OFF* */
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199 }
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200 /* *INDENT-ON* */
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201 #endif
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202 #include "close_code.h"
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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: */