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annotate src/file/SDL_rwops.c @ 1447:515df0086eb7

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Prefer the raw Win32 API over stdio for file RWops
author Sam Lantinga <slouken@libsdl.org>
date Mon, 27 Feb 2006 04:16:44 +0000
parents 47bf1767c4ca
children 2eb75f8a32ca
rev   line source
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
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1 /*
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2 SDL - Simple DirectMedia Layer
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c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges)
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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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c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges)
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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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c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges)
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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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c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges)
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parents: 1269
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13 Lesser General Public License for more details.
0
74212992fb08 Initial revision
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14
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c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges)
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parents: 1269
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15 You should have received a copy of the GNU Lesser General Public
c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges)
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parents: 1269
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16 License along with this library; if not, write to the Free Software
c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges)
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parents: 1269
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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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e8157fcb3114 Updated the source with the correct e-mail address
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20 slouken@libsdl.org
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21 */
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d910939febfa Use consistent identifiers for the various platforms we support.
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22 #include "SDL_config.h"
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23
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24 /* This file provides a general interface for SDL to read and write
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25 data sources. It can easily be extended to files, memory, etc.
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26 */
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27
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28 #include "SDL_endian.h"
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29 #include "SDL_rwops.h"
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450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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30
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22f39393668a Fixed build problem with SDL_string.c
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31
1447
515df0086eb7 Prefer the raw Win32 API over stdio for file RWops
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parents: 1446
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32 #ifdef __WIN32__
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33
1447
515df0086eb7 Prefer the raw Win32 API over stdio for file RWops
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34 /* Functions to read/write Win32 API file pointers */
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35
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47bf1767c4ca Date: Mon, 27 Feb 2006 02:17:29 +0100
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36 #define WINDOWS_LEAN_AND_MEAN
47bf1767c4ca Date: Mon, 27 Feb 2006 02:17:29 +0100
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37 #include <windows.h>
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38
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39 static int win32_file_open(SDL_RWops *context, const char *filename, const char *mode) {
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40
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41 UINT old_error_mode;
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42 HANDLE h;
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43 DWORD r_right, w_right;
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44 DWORD must_exist, truncate;
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45 int a_mode;
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46
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47 if (!context || !filename || !mode)
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48 return -1;
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49
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50 context->hidden.win32io.h = INVALID_HANDLE_VALUE; /* mark this as unusable */
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51
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52 /* "r" = reading, file must exist */
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53 /* "w" = writing, truncate existing, file may not exist */
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54 /* "r+"= reading or writing, file must exist */
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55 /* "a" = writing, append file may not exist */
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56 /* "a+"= append + read, file may not exist */
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57 /* "w+" = read, write, truncate. file may not exist */
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58
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59 must_exist = ( SDL_strchr(mode,'r') != NULL ) ? OPEN_EXISTING : 0;
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60 truncate = ( SDL_strchr(mode,'w') != NULL ) ? CREATE_ALWAYS : 0;
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61 r_right = ( SDL_strchr(mode,'+') != NULL || must_exist ) ? GENERIC_READ : 0;
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62 a_mode = ( SDL_strchr(mode,'a') != NULL );
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63 w_right = ( a_mode || SDL_strchr(mode,'w') || truncate ) ? GENERIC_WRITE : 0;
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64
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65 if (!r_right && !w_right) /* inconsistent mode */
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66 return -1; /* failed (invalid call)*/
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67
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68 /* Do not open a dialog box if failure */
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69 old_error_mode = SetErrorMode(SEM_NOOPENFILEERRORBOX|SEM_FAILCRITICALERRORS);
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70
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71 h = CreateFile(filename, (w_right|r_right), (w_right)? 0 : FILE_SHARE_READ,
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72 NULL, (must_exist|truncate), FILE_ATTRIBUTE_NORMAL,NULL);
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73
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74 /* restore old behaviour */
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75 SetErrorMode(old_error_mode);
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76
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77 if (h==INVALID_HANDLE_VALUE) {
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78 SDL_SetError("Couldn't open %s",filename);
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79 return -2; /* failed (CreateFile) */
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80 }
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81 context->hidden.win32io.h = h;
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82 context->hidden.win32io.append = a_mode;
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83
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84 return 0; /* ok */
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85 }
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86 static int win32_file_seek(SDL_RWops *context, int offset, int whence) {
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87 DWORD win32whence;
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88 int file_pos;
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89
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90 if (!context || context->hidden.win32io.h == INVALID_HANDLE_VALUE) {
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91 SDL_SetError("win32_file_seek: invalid context/file not opened");
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92 return -1;
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93 }
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94
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95 switch (whence) {
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96 case RW_SEEK_SET:
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97 win32whence = FILE_BEGIN; break;
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98 case RW_SEEK_CUR:
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99 win32whence = FILE_CURRENT; break;
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100 case RW_SEEK_END:
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101 win32whence = FILE_END; break;
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102 default:
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103 SDL_SetError("win32_file_seek: Unknown value for 'whence'");
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104 return -1;
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105 }
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106
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107 file_pos = SetFilePointer(context->hidden.win32io.h,offset,NULL,win32whence);
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108
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109 if ( file_pos != INVALID_SET_FILE_POINTER )
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110 return file_pos; /* success */
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111
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112 SDL_Error(SDL_EFSEEK);
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113 return -1; /* error */
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114 }
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115 static int win32_file_read(SDL_RWops *context, void *ptr, int size, int maxnum) {
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116
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117 int total_bytes;
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118 DWORD byte_read,nread;
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119
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120 total_bytes = size*maxnum;
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121
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122 if (!context || context->hidden.win32io.h == INVALID_HANDLE_VALUE || total_bytes<=0 || !size)
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123 return 0;
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124
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125 if (!ReadFile(context->hidden.win32io.h,ptr,total_bytes,&byte_read,NULL)) {
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126 SDL_Error(SDL_EFREAD);
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127 return 0;
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128 }
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129 nread = byte_read/size;
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130 return nread;
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131 }
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132 static int win32_file_write(SDL_RWops *context, const void *ptr, int size, int num) {
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133
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parents: 1402
diff changeset
134 int total_bytes;
47bf1767c4ca Date: Mon, 27 Feb 2006 02:17:29 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
135 DWORD byte_written,nwritten;
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Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
136
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parents: 1402
diff changeset
137 total_bytes = size*num;
47bf1767c4ca Date: Mon, 27 Feb 2006 02:17:29 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
138
47bf1767c4ca Date: Mon, 27 Feb 2006 02:17:29 +0100
Sam Lantinga <slouken@libsdl.org>
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diff changeset
139 if (!context || context->hidden.win32io.h==INVALID_HANDLE_VALUE || total_bytes<=0 || !size)
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Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
140 return 0;
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Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
141
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
142 /* if in append mode, we must go to the EOF before write */
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Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
143 if (context->hidden.win32io.append) {
47bf1767c4ca Date: Mon, 27 Feb 2006 02:17:29 +0100
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parents: 1402
diff changeset
144 if ( SetFilePointer(context->hidden.win32io.h,0L,NULL,FILE_END) == INVALID_SET_FILE_POINTER ) {
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parents: 1402
diff changeset
145 SDL_Error(SDL_EFWRITE);
47bf1767c4ca Date: Mon, 27 Feb 2006 02:17:29 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
146 return 0;
47bf1767c4ca Date: Mon, 27 Feb 2006 02:17:29 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
147 }
47bf1767c4ca Date: Mon, 27 Feb 2006 02:17:29 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
148 }
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
149
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
150 if (!WriteFile(context->hidden.win32io.h,ptr,total_bytes,&byte_written,NULL)) {
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diff changeset
151 SDL_Error(SDL_EFWRITE);
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
152 return 0;
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Sam Lantinga <slouken@libsdl.org>
parents: 1402
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153 }
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diff changeset
154
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diff changeset
155 nwritten = byte_written/size;
47bf1767c4ca Date: Mon, 27 Feb 2006 02:17:29 +0100
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parents: 1402
diff changeset
156 return nwritten;
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Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
157 }
47bf1767c4ca Date: Mon, 27 Feb 2006 02:17:29 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
158 static int win32_file_close(SDL_RWops *context) {
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diff changeset
159
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160 if ( context ) {
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161 if (context->hidden.win32io.h != INVALID_HANDLE_VALUE) {
47bf1767c4ca Date: Mon, 27 Feb 2006 02:17:29 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
162 CloseHandle(context->hidden.win32io.h);
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163 context->hidden.win32io.h = INVALID_HANDLE_VALUE; /* to be sure */
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parents: 1402
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164 }
47bf1767c4ca Date: Mon, 27 Feb 2006 02:17:29 +0100
Sam Lantinga <slouken@libsdl.org>
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diff changeset
165 SDL_FreeRW(context);
47bf1767c4ca Date: Mon, 27 Feb 2006 02:17:29 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
166 }
47bf1767c4ca Date: Mon, 27 Feb 2006 02:17:29 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
167 return(0);
47bf1767c4ca Date: Mon, 27 Feb 2006 02:17:29 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
168 }
1447
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diff changeset
169 #endif /* __WIN32__ */
1446
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diff changeset
170
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diff changeset
171 #ifdef HAVE_STDIO_H
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172
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diff changeset
173 /* Functions to read/write stdio file pointers */
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diff changeset
174
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parents: 1446
diff changeset
175 static int stdio_seek(SDL_RWops *context, int offset, int whence)
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parents: 1446
diff changeset
176 {
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parents: 1446
diff changeset
177 if ( fseek(context->hidden.stdio.fp, offset, whence) == 0 ) {
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parents: 1446
diff changeset
178 return(ftell(context->hidden.stdio.fp));
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diff changeset
179 } else {
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diff changeset
180 SDL_Error(SDL_EFSEEK);
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
181 return(-1);
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diff changeset
182 }
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diff changeset
183 }
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diff changeset
184 static int stdio_read(SDL_RWops *context, void *ptr, int size, int maxnum)
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parents: 1446
diff changeset
185 {
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Sam Lantinga <slouken@libsdl.org>
parents: 1446
diff changeset
186 size_t nread;
1446
47bf1767c4ca Date: Mon, 27 Feb 2006 02:17:29 +0100
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diff changeset
187
1447
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diff changeset
188 nread = fread(ptr, size, maxnum, context->hidden.stdio.fp);
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parents: 1446
diff changeset
189 if ( nread == 0 && ferror(context->hidden.stdio.fp) ) {
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parents: 1446
diff changeset
190 SDL_Error(SDL_EFREAD);
515df0086eb7 Prefer the raw Win32 API over stdio for file RWops
Sam Lantinga <slouken@libsdl.org>
parents: 1446
diff changeset
191 }
515df0086eb7 Prefer the raw Win32 API over stdio for file RWops
Sam Lantinga <slouken@libsdl.org>
parents: 1446
diff changeset
192 return(nread);
515df0086eb7 Prefer the raw Win32 API over stdio for file RWops
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parents: 1446
diff changeset
193 }
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parents: 1446
diff changeset
194 static int stdio_write(SDL_RWops *context, const void *ptr, int size, int num)
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parents: 1446
diff changeset
195 {
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parents: 1446
diff changeset
196 size_t nwrote;
1446
47bf1767c4ca Date: Mon, 27 Feb 2006 02:17:29 +0100
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diff changeset
197
1447
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diff changeset
198 nwrote = fwrite(ptr, size, num, context->hidden.stdio.fp);
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parents: 1446
diff changeset
199 if ( nwrote == 0 && ferror(context->hidden.stdio.fp) ) {
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parents: 1446
diff changeset
200 SDL_Error(SDL_EFWRITE);
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Sam Lantinga <slouken@libsdl.org>
parents: 1446
diff changeset
201 }
515df0086eb7 Prefer the raw Win32 API over stdio for file RWops
Sam Lantinga <slouken@libsdl.org>
parents: 1446
diff changeset
202 return(nwrote);
515df0086eb7 Prefer the raw Win32 API over stdio for file RWops
Sam Lantinga <slouken@libsdl.org>
parents: 1446
diff changeset
203 }
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diff changeset
204 static int stdio_close(SDL_RWops *context)
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parents: 1446
diff changeset
205 {
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Sam Lantinga <slouken@libsdl.org>
parents: 1446
diff changeset
206 if ( context ) {
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Sam Lantinga <slouken@libsdl.org>
parents: 1446
diff changeset
207 if ( context->hidden.stdio.autoclose ) {
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parents: 1446
diff changeset
208 /* WARNING: Check the return value here! */
515df0086eb7 Prefer the raw Win32 API over stdio for file RWops
Sam Lantinga <slouken@libsdl.org>
parents: 1446
diff changeset
209 fclose(context->hidden.stdio.fp);
515df0086eb7 Prefer the raw Win32 API over stdio for file RWops
Sam Lantinga <slouken@libsdl.org>
parents: 1446
diff changeset
210 }
515df0086eb7 Prefer the raw Win32 API over stdio for file RWops
Sam Lantinga <slouken@libsdl.org>
parents: 1446
diff changeset
211 SDL_FreeRW(context);
515df0086eb7 Prefer the raw Win32 API over stdio for file RWops
Sam Lantinga <slouken@libsdl.org>
parents: 1446
diff changeset
212 }
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Sam Lantinga <slouken@libsdl.org>
parents: 1446
diff changeset
213 return(0);
515df0086eb7 Prefer the raw Win32 API over stdio for file RWops
Sam Lantinga <slouken@libsdl.org>
parents: 1446
diff changeset
214 }
1446
47bf1767c4ca Date: Mon, 27 Feb 2006 02:17:29 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
215 #endif /* !HAVE_STDIO_H */
1330
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents: 1312
diff changeset
216
0
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parents:
diff changeset
217 /* Functions to read/write memory pointers */
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parents:
diff changeset
218
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parents:
diff changeset
219 static int mem_seek(SDL_RWops *context, int offset, int whence)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
220 {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
221 Uint8 *newpos;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
222
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
223 switch (whence) {
1330
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents: 1312
diff changeset
224 case RW_SEEK_SET:
0
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
225 newpos = context->hidden.mem.base+offset;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
226 break;
1330
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents: 1312
diff changeset
227 case RW_SEEK_CUR:
0
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parents:
diff changeset
228 newpos = context->hidden.mem.here+offset;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
229 break;
1330
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents: 1312
diff changeset
230 case RW_SEEK_END:
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
231 newpos = context->hidden.mem.stop+offset;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
232 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
233 default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
234 SDL_SetError("Unknown value for 'whence'");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
235 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
236 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
237 if ( newpos < context->hidden.mem.base ) {
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parents:
diff changeset
238 newpos = context->hidden.mem.base;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
239 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
240 if ( newpos > context->hidden.mem.stop ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
241 newpos = context->hidden.mem.stop;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
242 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
243 context->hidden.mem.here = newpos;
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parents:
diff changeset
244 return(context->hidden.mem.here-context->hidden.mem.base);
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parents:
diff changeset
245 }
74212992fb08 Initial revision
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parents:
diff changeset
246 static int mem_read(SDL_RWops *context, void *ptr, int size, int maxnum)
74212992fb08 Initial revision
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parents:
diff changeset
247 {
1078
e2ef6b7001fd Patch from Antonio SJ Musumeci:
Ryan C. Gordon <icculus@icculus.org>
parents: 769
diff changeset
248 int total_bytes;
e2ef6b7001fd Patch from Antonio SJ Musumeci:
Ryan C. Gordon <icculus@icculus.org>
parents: 769
diff changeset
249 int mem_available;
e2ef6b7001fd Patch from Antonio SJ Musumeci:
Ryan C. Gordon <icculus@icculus.org>
parents: 769
diff changeset
250
e2ef6b7001fd Patch from Antonio SJ Musumeci:
Ryan C. Gordon <icculus@icculus.org>
parents: 769
diff changeset
251 total_bytes = (maxnum * size);
e2ef6b7001fd Patch from Antonio SJ Musumeci:
Ryan C. Gordon <icculus@icculus.org>
parents: 769
diff changeset
252 if ( (maxnum <= 0) || (size <= 0) || ((total_bytes / maxnum) != size) ) {
e2ef6b7001fd Patch from Antonio SJ Musumeci:
Ryan C. Gordon <icculus@icculus.org>
parents: 769
diff changeset
253 return 0;
e2ef6b7001fd Patch from Antonio SJ Musumeci:
Ryan C. Gordon <icculus@icculus.org>
parents: 769
diff changeset
254 }
0
74212992fb08 Initial revision
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parents:
diff changeset
255
1078
e2ef6b7001fd Patch from Antonio SJ Musumeci:
Ryan C. Gordon <icculus@icculus.org>
parents: 769
diff changeset
256 mem_available = (context->hidden.mem.stop - context->hidden.mem.here);
e2ef6b7001fd Patch from Antonio SJ Musumeci:
Ryan C. Gordon <icculus@icculus.org>
parents: 769
diff changeset
257 if (total_bytes > mem_available) {
e2ef6b7001fd Patch from Antonio SJ Musumeci:
Ryan C. Gordon <icculus@icculus.org>
parents: 769
diff changeset
258 total_bytes = mem_available;
0
74212992fb08 Initial revision
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parents:
diff changeset
259 }
1078
e2ef6b7001fd Patch from Antonio SJ Musumeci:
Ryan C. Gordon <icculus@icculus.org>
parents: 769
diff changeset
260
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
261 SDL_memcpy(ptr, context->hidden.mem.here, total_bytes);
1078
e2ef6b7001fd Patch from Antonio SJ Musumeci:
Ryan C. Gordon <icculus@icculus.org>
parents: 769
diff changeset
262 context->hidden.mem.here += total_bytes;
e2ef6b7001fd Patch from Antonio SJ Musumeci:
Ryan C. Gordon <icculus@icculus.org>
parents: 769
diff changeset
263
e2ef6b7001fd Patch from Antonio SJ Musumeci:
Ryan C. Gordon <icculus@icculus.org>
parents: 769
diff changeset
264 return (total_bytes / size);
0
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
265 }
74212992fb08 Initial revision
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parents:
diff changeset
266 static int mem_write(SDL_RWops *context, const void *ptr, int size, int num)
74212992fb08 Initial revision
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parents:
diff changeset
267 {
74212992fb08 Initial revision
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parents:
diff changeset
268 if ( (context->hidden.mem.here + (num*size)) > context->hidden.mem.stop ) {
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parents:
diff changeset
269 num = (context->hidden.mem.stop-context->hidden.mem.here)/size;
74212992fb08 Initial revision
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parents:
diff changeset
270 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1330
diff changeset
271 SDL_memcpy(context->hidden.mem.here, ptr, num*size);
0
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parents:
diff changeset
272 context->hidden.mem.here += num*size;
74212992fb08 Initial revision
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parents:
diff changeset
273 return(num);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
274 }
764
974c0fb74bf8 Added function to create RWops from const memory: SDL_RWFromConstMem()
Sam Lantinga <slouken@libsdl.org>
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diff changeset
275 static int mem_writeconst(SDL_RWops *context, const void *ptr, int size, int num)
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276 {
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277 SDL_SetError("Can't write to read-only memory");
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278 return(-1);
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279 }
0
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280 static int mem_close(SDL_RWops *context)
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281 {
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282 if ( context ) {
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283 SDL_FreeRW(context);
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284 }
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285 return(0);
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286 }
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287
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288
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289 /* Functions to create SDL_RWops structures from various data sources */
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290
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291 #ifdef __MACOS__
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292 /*
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293 * translate unix-style slash-separated filename to mac-style colon-separated
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294 * name; return malloced string
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295 */
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296 static char *unix_to_mac(const char *file)
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297 {
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298 int flen = SDL_strlen(file);
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299 char *path = SDL_malloc(flen + 2);
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300 const char *src = file;
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301 char *dst = path;
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302 if(*src == '/') {
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303 /* really depends on filesystem layout, hope for the best */
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304 src++;
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305 } else {
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306 /* Check if this is a MacOS path to begin with */
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307 if(*src != ':')
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308 *dst++ = ':'; /* relative paths begin with ':' */
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309 }
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310 while(src < file + flen) {
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311 const char *end = SDL_strchr(src, '/');
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312 int len;
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313 if(!end)
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314 end = file + flen; /* last component */
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315 len = end - src;
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316 if(len == 0 || (len == 1 && src[0] == '.')) {
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317 /* remove repeated slashes and . */
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318 } else {
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319 if(len == 2 && src[0] == '.' && src[1] == '.') {
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320 /* replace .. with the empty string */
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321 } else {
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322 SDL_memcpy(dst, src, len);
0
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323 dst += len;
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324 }
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325 if(end < file + flen)
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326 *dst++ = ':';
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327 }
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328 src = end + 1;
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329 }
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330 *dst++ = '\0';
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331 return path;
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332 }
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333 #endif /* __MACOS__ */
0
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334
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335 SDL_RWops *SDL_RWFromFile(const char *file, const char *mode)
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336 {
1330
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337 SDL_RWops *rwops = NULL;
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338
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339 #ifdef __WIN32__
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340 rwops = SDL_AllocRW();
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341 rwops->hidden.win32io.h = INVALID_HANDLE_VALUE;
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342 if (win32_file_open(rwops,file,mode)) {
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343 SDL_FreeRW(rwops);
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344 return NULL;
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345 }
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346 rwops->seek = win32_file_seek;
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347 rwops->read = win32_file_read;
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348 rwops->write = win32_file_write;
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349 rwops->close = win32_file_close;
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350
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351 #elif HAVE_STDIO_H
0
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352 FILE *fp;
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353
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354 #ifdef __MACOS__
0
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355 {
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356 char *mpath = unix_to_mac(file);
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357 fp = fopen(mpath, mode);
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358 SDL_free(mpath);
0
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359 }
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diff changeset
360 #else
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361 fp = fopen(file, mode);
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362 #endif
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363 if ( fp == NULL ) {
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364 SDL_SetError("Couldn't open %s", file);
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365 } else {
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366 rwops = SDL_RWFromFP(fp, 1);
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367 }
1447
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diff changeset
368 #else
515df0086eb7 Prefer the raw Win32 API over stdio for file RWops
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369 SDL_SetError("SDL not compiled with stdio support");
1446
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370 #endif /* !HAVE_STDIO_H */
1447
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diff changeset
371
0
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diff changeset
372 return(rwops);
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diff changeset
373 }
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diff changeset
374
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375 #ifdef HAVE_STDIO_H
0
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376 SDL_RWops *SDL_RWFromFP(FILE *fp, int autoclose)
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diff changeset
377 {
1330
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diff changeset
378 SDL_RWops *rwops = NULL;
0
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diff changeset
379
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diff changeset
380 rwops = SDL_AllocRW();
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diff changeset
381 if ( rwops != NULL ) {
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diff changeset
382 rwops->seek = stdio_seek;
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diff changeset
383 rwops->read = stdio_read;
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diff changeset
384 rwops->write = stdio_write;
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diff changeset
385 rwops->close = stdio_close;
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diff changeset
386 rwops->hidden.stdio.fp = fp;
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diff changeset
387 rwops->hidden.stdio.autoclose = autoclose;
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parents:
diff changeset
388 }
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diff changeset
389 return(rwops);
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diff changeset
390 }
1330
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diff changeset
391 #endif /* HAVE_STDIO_H */
0
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diff changeset
392
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diff changeset
393 SDL_RWops *SDL_RWFromMem(void *mem, int size)
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diff changeset
394 {
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diff changeset
395 SDL_RWops *rwops;
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parents:
diff changeset
396
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diff changeset
397 rwops = SDL_AllocRW();
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diff changeset
398 if ( rwops != NULL ) {
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diff changeset
399 rwops->seek = mem_seek;
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diff changeset
400 rwops->read = mem_read;
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parents:
diff changeset
401 rwops->write = mem_write;
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parents:
diff changeset
402 rwops->close = mem_close;
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parents:
diff changeset
403 rwops->hidden.mem.base = (Uint8 *)mem;
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diff changeset
404 rwops->hidden.mem.here = rwops->hidden.mem.base;
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parents:
diff changeset
405 rwops->hidden.mem.stop = rwops->hidden.mem.base+size;
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parents:
diff changeset
406 }
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diff changeset
407 return(rwops);
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parents:
diff changeset
408 }
74212992fb08 Initial revision
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diff changeset
409
764
974c0fb74bf8 Added function to create RWops from const memory: SDL_RWFromConstMem()
Sam Lantinga <slouken@libsdl.org>
parents: 543
diff changeset
410 SDL_RWops *SDL_RWFromConstMem(const void *mem, int size)
974c0fb74bf8 Added function to create RWops from const memory: SDL_RWFromConstMem()
Sam Lantinga <slouken@libsdl.org>
parents: 543
diff changeset
411 {
974c0fb74bf8 Added function to create RWops from const memory: SDL_RWFromConstMem()
Sam Lantinga <slouken@libsdl.org>
parents: 543
diff changeset
412 SDL_RWops *rwops;
974c0fb74bf8 Added function to create RWops from const memory: SDL_RWFromConstMem()
Sam Lantinga <slouken@libsdl.org>
parents: 543
diff changeset
413
974c0fb74bf8 Added function to create RWops from const memory: SDL_RWFromConstMem()
Sam Lantinga <slouken@libsdl.org>
parents: 543
diff changeset
414 rwops = SDL_AllocRW();
974c0fb74bf8 Added function to create RWops from const memory: SDL_RWFromConstMem()
Sam Lantinga <slouken@libsdl.org>
parents: 543
diff changeset
415 if ( rwops != NULL ) {
974c0fb74bf8 Added function to create RWops from const memory: SDL_RWFromConstMem()
Sam Lantinga <slouken@libsdl.org>
parents: 543
diff changeset
416 rwops->seek = mem_seek;
974c0fb74bf8 Added function to create RWops from const memory: SDL_RWFromConstMem()
Sam Lantinga <slouken@libsdl.org>
parents: 543
diff changeset
417 rwops->read = mem_read;
974c0fb74bf8 Added function to create RWops from const memory: SDL_RWFromConstMem()
Sam Lantinga <slouken@libsdl.org>
parents: 543
diff changeset
418 rwops->write = mem_writeconst;
974c0fb74bf8 Added function to create RWops from const memory: SDL_RWFromConstMem()
Sam Lantinga <slouken@libsdl.org>
parents: 543
diff changeset
419 rwops->close = mem_close;
974c0fb74bf8 Added function to create RWops from const memory: SDL_RWFromConstMem()
Sam Lantinga <slouken@libsdl.org>
parents: 543
diff changeset
420 rwops->hidden.mem.base = (Uint8 *)mem;
974c0fb74bf8 Added function to create RWops from const memory: SDL_RWFromConstMem()
Sam Lantinga <slouken@libsdl.org>
parents: 543
diff changeset
421 rwops->hidden.mem.here = rwops->hidden.mem.base;
974c0fb74bf8 Added function to create RWops from const memory: SDL_RWFromConstMem()
Sam Lantinga <slouken@libsdl.org>
parents: 543
diff changeset
422 rwops->hidden.mem.stop = rwops->hidden.mem.base+size;
974c0fb74bf8 Added function to create RWops from const memory: SDL_RWFromConstMem()
Sam Lantinga <slouken@libsdl.org>
parents: 543
diff changeset
423 }
974c0fb74bf8 Added function to create RWops from const memory: SDL_RWFromConstMem()
Sam Lantinga <slouken@libsdl.org>
parents: 543
diff changeset
424 return(rwops);
974c0fb74bf8 Added function to create RWops from const memory: SDL_RWFromConstMem()
Sam Lantinga <slouken@libsdl.org>
parents: 543
diff changeset
425 }
974c0fb74bf8 Added function to create RWops from const memory: SDL_RWFromConstMem()
Sam Lantinga <slouken@libsdl.org>
parents: 543
diff changeset
426
0
74212992fb08 Initial revision
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parents:
diff changeset
427 SDL_RWops *SDL_AllocRW(void)
74212992fb08 Initial revision
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parents:
diff changeset
428 {
74212992fb08 Initial revision
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429 SDL_RWops *area;
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430
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3692456e7b0f Use SDL_ prefixed versions of C library functions.
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431 area = (SDL_RWops *)SDL_malloc(sizeof *area);
0
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432 if ( area == NULL ) {
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433 SDL_OutOfMemory();
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434 }
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435 return(area);
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436 }
74212992fb08 Initial revision
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437
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438 void SDL_FreeRW(SDL_RWops *area)
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439 {
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440 SDL_free(area);
0
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441 }
1354
22f39393668a Fixed build problem with SDL_string.c
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442
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443 /* Functions for dynamically reading and writing endian-specific values */
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444
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445 Uint16 SDL_ReadLE16 (SDL_RWops *src)
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446 {
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447 Uint16 value;
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448
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449 SDL_RWread(src, &value, (sizeof value), 1);
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450 return(SDL_SwapLE16(value));
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451 }
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452 Uint16 SDL_ReadBE16 (SDL_RWops *src)
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453 {
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454 Uint16 value;
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455
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456 SDL_RWread(src, &value, (sizeof value), 1);
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457 return(SDL_SwapBE16(value));
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458 }
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459 Uint32 SDL_ReadLE32 (SDL_RWops *src)
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460 {
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461 Uint32 value;
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462
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463 SDL_RWread(src, &value, (sizeof value), 1);
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464 return(SDL_SwapLE32(value));
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465 }
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466 Uint32 SDL_ReadBE32 (SDL_RWops *src)
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467 {
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468 Uint32 value;
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469
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470 SDL_RWread(src, &value, (sizeof value), 1);
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471 return(SDL_SwapBE32(value));
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472 }
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473 Uint64 SDL_ReadLE64 (SDL_RWops *src)
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474 {
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475 Uint64 value;
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476
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477 SDL_RWread(src, &value, (sizeof value), 1);
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478 return(SDL_SwapLE64(value));
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479 }
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480 Uint64 SDL_ReadBE64 (SDL_RWops *src)
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481 {
22f39393668a Fixed build problem with SDL_string.c
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482 Uint64 value;
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diff changeset
483
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484 SDL_RWread(src, &value, (sizeof value), 1);
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485 return(SDL_SwapBE64(value));
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486 }
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487
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488 int SDL_WriteLE16 (SDL_RWops *dst, Uint16 value)
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489 {
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490 value = SDL_SwapLE16(value);
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491 return(SDL_RWwrite(dst, &value, (sizeof value), 1));
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492 }
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493 int SDL_WriteBE16 (SDL_RWops *dst, Uint16 value)
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494 {
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495 value = SDL_SwapBE16(value);
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496 return(SDL_RWwrite(dst, &value, (sizeof value), 1));
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497 }
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498 int SDL_WriteLE32 (SDL_RWops *dst, Uint32 value)
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499 {
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500 value = SDL_SwapLE32(value);
22f39393668a Fixed build problem with SDL_string.c
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501 return(SDL_RWwrite(dst, &value, (sizeof value), 1));
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502 }
22f39393668a Fixed build problem with SDL_string.c
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503 int SDL_WriteBE32 (SDL_RWops *dst, Uint32 value)
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504 {
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505 value = SDL_SwapBE32(value);
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506 return(SDL_RWwrite(dst, &value, (sizeof value), 1));
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507 }
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508 int SDL_WriteLE64 (SDL_RWops *dst, Uint64 value)
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509 {
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diff changeset
510 value = SDL_SwapLE64(value);
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511 return(SDL_RWwrite(dst, &value, (sizeof value), 1));
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512 }
22f39393668a Fixed build problem with SDL_string.c
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diff changeset
513 int SDL_WriteBE64 (SDL_RWops *dst, Uint64 value)
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diff changeset
514 {
22f39393668a Fixed build problem with SDL_string.c
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diff changeset
515 value = SDL_SwapBE64(value);
22f39393668a Fixed build problem with SDL_string.c
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diff changeset
516 return(SDL_RWwrite(dst, &value, (sizeof value), 1));
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517 }