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annotate include/SDL_rwops.h @ 4013:5804139bdf0b SDL-1.2

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author Sam Lantinga <slouken@libsdl.org>
date Sat, 07 Jul 2007 19:22:27 +0000
parents 2eb75f8a32ca
children 782fd950bd46 c121d94672cb 255b0469ca83
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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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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 /* This file provides a general interface for SDL to read and write
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24 data sources. It can easily be extended to files, memory, etc.
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25 */
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26
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27 #ifndef _SDL_rwops_h
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28 #define _SDL_rwops_h
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29
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30 #include "SDL_stdinc.h"
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31 #include "SDL_error.h"
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32
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33 #include "begin_code.h"
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34 /* Set up for C function definitions, even when using C++ */
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35 #ifdef __cplusplus
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36 extern "C" {
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37 #endif
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38
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39 /* This is the read/write operation structure -- very basic */
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40
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41 typedef struct SDL_RWops {
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42 /* Seek to 'offset' relative to whence, one of stdio's whence values:
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43 SEEK_SET, SEEK_CUR, SEEK_END
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44 Returns the final offset in the data source.
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45 */
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46 int (SDLCALL *seek)(struct SDL_RWops *context, int offset, int whence);
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47
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48 /* Read up to 'num' objects each of size 'objsize' from the data
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49 source to the area pointed at by 'ptr'.
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50 Returns the number of objects read, or -1 if the read failed.
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51 */
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52 int (SDLCALL *read)(struct SDL_RWops *context, void *ptr, int size, int maxnum);
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53
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54 /* Write exactly 'num' objects each of size 'objsize' from the area
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55 pointed at by 'ptr' to data source.
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56 Returns 'num', or -1 if the write failed.
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57 */
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58 int (SDLCALL *write)(struct SDL_RWops *context, const void *ptr, int size, int num);
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59
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60 /* Close and free an allocated SDL_FSops structure */
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61 int (SDLCALL *close)(struct SDL_RWops *context);
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62
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63 Uint32 type;
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64 union {
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65 #ifdef __WIN32__
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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 } win32io;
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70 #endif
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71 #ifdef HAVE_STDIO_H
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72 struct {
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73 int autoclose;
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74 FILE *fp;
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75 } stdio;
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76 #endif
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77 struct {
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78 Uint8 *base;
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79 Uint8 *here;
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80 Uint8 *stop;
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81 } mem;
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82 struct {
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83 void *data1;
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84 } unknown;
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85 } hidden;
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86
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87 } SDL_RWops;
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88
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89
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90 /* Functions to create SDL_RWops structures from various data sources */
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91
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92 extern DECLSPEC SDL_RWops * SDLCALL SDL_RWFromFile(const char *file, const char *mode);
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93
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94 #ifdef HAVE_STDIO_H
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95 extern DECLSPEC SDL_RWops * SDLCALL SDL_RWFromFP(FILE *fp, int autoclose);
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96 #endif
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97
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98 extern DECLSPEC SDL_RWops * SDLCALL SDL_RWFromMem(void *mem, int size);
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99 extern DECLSPEC SDL_RWops * SDLCALL SDL_RWFromConstMem(const void *mem, int size);
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100
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101 extern DECLSPEC SDL_RWops * SDLCALL SDL_AllocRW(void);
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102 extern DECLSPEC void SDLCALL SDL_FreeRW(SDL_RWops *area);
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103
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104 #define RW_SEEK_SET 0 /* Seek from the beginning of data */
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105 #define RW_SEEK_CUR 1 /* Seek relative to current read point */
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106 #define RW_SEEK_END 2 /* Seek relative to the end of data */
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107
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108 /* Macros to easily read and write from an SDL_RWops structure */
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109 #define SDL_RWseek(ctx, offset, whence) (ctx)->seek(ctx, offset, whence)
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110 #define SDL_RWtell(ctx) (ctx)->seek(ctx, 0, RW_SEEK_CUR)
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111 #define SDL_RWread(ctx, ptr, size, n) (ctx)->read(ctx, ptr, size, n)
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112 #define SDL_RWwrite(ctx, ptr, size, n) (ctx)->write(ctx, ptr, size, n)
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113 #define SDL_RWclose(ctx) (ctx)->close(ctx)
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114
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115
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116 /* Read an item of the specified endianness and return in native format */
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117 extern DECLSPEC Uint16 SDLCALL SDL_ReadLE16(SDL_RWops *src);
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118 extern DECLSPEC Uint16 SDLCALL SDL_ReadBE16(SDL_RWops *src);
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119 extern DECLSPEC Uint32 SDLCALL SDL_ReadLE32(SDL_RWops *src);
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120 extern DECLSPEC Uint32 SDLCALL SDL_ReadBE32(SDL_RWops *src);
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121 extern DECLSPEC Uint64 SDLCALL SDL_ReadLE64(SDL_RWops *src);
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122 extern DECLSPEC Uint64 SDLCALL SDL_ReadBE64(SDL_RWops *src);
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123
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124 /* Write an item of native format to the specified endianness */
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125 extern DECLSPEC int SDLCALL SDL_WriteLE16(SDL_RWops *dst, Uint16 value);
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126 extern DECLSPEC int SDLCALL SDL_WriteBE16(SDL_RWops *dst, Uint16 value);
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127 extern DECLSPEC int SDLCALL SDL_WriteLE32(SDL_RWops *dst, Uint32 value);
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128 extern DECLSPEC int SDLCALL SDL_WriteBE32(SDL_RWops *dst, Uint32 value);
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129 extern DECLSPEC int SDLCALL SDL_WriteLE64(SDL_RWops *dst, Uint64 value);
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130 extern DECLSPEC int SDLCALL SDL_WriteBE64(SDL_RWops *dst, Uint64 value);
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131
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132
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133 /* Ends C function definitions when using C++ */
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134 #ifdef __cplusplus
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135 }
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136 #endif
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137 #include "close_code.h"
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138
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139 #endif /* _SDL_rwops_h */