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annotate include/SDL_rwops.h @ 1525:23a347cfbed8

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Fixed bug #38 I'm using SDL 1.2.9 with Visual C++ 7.0 on Windows 2000. Here's the setup: my game starts in a window, with SDL_WM_GrabInput(SDL_GRAB_ON) to constrain the cursor to the game window. The mouse cursor is outside of the window when the game launches, and when the window appears the cursor is grabbed and placed at the top left corner of the inside of the game window. At this point, if I click the mouse without moving it, the SDL_MOUSEBUTTONDOWN event's mouse coordinates are (65535,65535).
author Sam Lantinga <slouken@libsdl.org>
date Tue, 14 Mar 2006 06:00:30 +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 */