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annotate include/SDL_rwops.h @ 2159:dd4753e47ed4

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Merged read-ahead support for Win32 file I/O from SDL 1.2 revision 3183
author Sam Lantinga <slouken@libsdl.org>
date Tue, 10 Jul 2007 05:01:22 +0000
parents c121d94672cb
children 00adbaed3910
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 SEEK_SET, SEEK_CUR, 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 int (SDLCALL * seek) (struct SDL_RWops * context, int offset, int whence);
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53
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54 /* Read up to 'num' objects each of size 'objsize' from the data
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55 source to the area pointed at by 'ptr'.
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56 Returns the number of objects read, or -1 if the read failed.
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57 */
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58 int (SDLCALL * read) (struct SDL_RWops * context, void *ptr, int size,
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59 int maxnum);
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60
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61 /* Write exactly 'num' objects each of size 'objsize' from the area
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62 pointed at by 'ptr' to data source.
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63 Returns 'num', or -1 if the write failed.
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64 */
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65 int (SDLCALL * write) (struct SDL_RWops * context, const void *ptr,
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66 int size, int num);
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67
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68 /* Close and free an allocated SDL_FSops structure */
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69 int (SDLCALL * close) (struct SDL_RWops * context);
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70
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71 Uint32 type;
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72 union
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73 {
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74 #ifdef __WIN32__
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75 struct
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76 {
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77 int append;
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78 void *h;
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79 struct
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80 {
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81 void *data;
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82 int size;
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83 int left;
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84 } buffer;
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85 } win32io;
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86 #endif
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87 #ifdef HAVE_STDIO_H
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88 struct
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89 {
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90 int autoclose;
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91 FILE *fp;
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92 } stdio;
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93 #endif
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94 struct
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95 {
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96 Uint8 *base;
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97 Uint8 *here;
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98 Uint8 *stop;
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99 } mem;
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100 struct
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101 {
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102 void *data1;
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103 } unknown;
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104 } hidden;
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105
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106 } SDL_RWops;
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107
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108
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109 /* Functions to create SDL_RWops structures from various data sources */
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110
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111 extern DECLSPEC SDL_RWops *SDLCALL SDL_RWFromFile(const char *file,
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112 const char *mode);
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113
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114 #ifdef HAVE_STDIO_H
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115 extern DECLSPEC SDL_RWops *SDLCALL SDL_RWFromFP(FILE * fp, int autoclose);
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116 #endif
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117
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118 extern DECLSPEC SDL_RWops *SDLCALL SDL_RWFromMem(void *mem, int size);
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119 extern DECLSPEC SDL_RWops *SDLCALL SDL_RWFromConstMem(const void *mem,
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120 int size);
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121
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122 extern DECLSPEC SDL_RWops *SDLCALL SDL_AllocRW(void);
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123 extern DECLSPEC void SDLCALL SDL_FreeRW(SDL_RWops * area);
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124
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125 #define RW_SEEK_SET 0 /* Seek from the beginning of data */
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126 #define RW_SEEK_CUR 1 /* Seek relative to current read point */
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127 #define RW_SEEK_END 2 /* Seek relative to the end of data */
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128
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129 /* Macros to easily read and write from an SDL_RWops structure */
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130 #define SDL_RWseek(ctx, offset, whence) (ctx)->seek(ctx, offset, whence)
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131 #define SDL_RWtell(ctx) (ctx)->seek(ctx, 0, RW_SEEK_CUR)
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132 #define SDL_RWread(ctx, ptr, size, n) (ctx)->read(ctx, ptr, size, n)
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133 #define SDL_RWwrite(ctx, ptr, size, n) (ctx)->write(ctx, ptr, size, n)
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134 #define SDL_RWclose(ctx) (ctx)->close(ctx)
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135
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136
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137 /* Read an item of the specified endianness and return in native format */
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138 extern DECLSPEC Uint16 SDLCALL SDL_ReadLE16(SDL_RWops * src);
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139 extern DECLSPEC Uint16 SDLCALL SDL_ReadBE16(SDL_RWops * src);
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140 extern DECLSPEC Uint32 SDLCALL SDL_ReadLE32(SDL_RWops * src);
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141 extern DECLSPEC Uint32 SDLCALL SDL_ReadBE32(SDL_RWops * src);
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142 extern DECLSPEC Uint64 SDLCALL SDL_ReadLE64(SDL_RWops * src);
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143 extern DECLSPEC Uint64 SDLCALL SDL_ReadBE64(SDL_RWops * src);
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144
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145 /* Write an item of native format to the specified endianness */
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146 extern DECLSPEC int SDLCALL SDL_WriteLE16(SDL_RWops * dst, Uint16 value);
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147 extern DECLSPEC int SDLCALL SDL_WriteBE16(SDL_RWops * dst, Uint16 value);
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148 extern DECLSPEC int SDLCALL SDL_WriteLE32(SDL_RWops * dst, Uint32 value);
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149 extern DECLSPEC int SDLCALL SDL_WriteBE32(SDL_RWops * dst, Uint32 value);
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150 extern DECLSPEC int SDLCALL SDL_WriteLE64(SDL_RWops * dst, Uint64 value);
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151 extern DECLSPEC int SDLCALL SDL_WriteBE64(SDL_RWops * dst, Uint64 value);
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152
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153
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154 /* Ends C function definitions when using C++ */
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155 #ifdef __cplusplus
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156 /* *INDENT-OFF* */
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157 }
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158 /* *INDENT-ON* */
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159 #endif
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160 #include "close_code.h"
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161
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162 #endif /* _SDL_rwops_h */
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163
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164 /* vi: set ts=4 sw=4 expandtab: */