annotate playsound/physfsrwops.c @ 551:668dd6675b7f

Renamed a bunch of FILENAME to FILENAME.txt
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 09 Sep 2008 16:26:24 -0400
parents 2df1f5c62d38
children
rev   line source
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1 /*
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2 * This code provides a glue layer between PhysicsFS and Simple Directmedia
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3 * Layer's (SDL) RWops i/o abstraction.
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4 *
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5 * License: this code is public domain. I make no warranty that it is useful,
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6 * correct, harmless, or environmentally safe.
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7 *
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8 * This particular file may be used however you like, including copying it
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9 * verbatim into a closed-source project, exploiting it commercially, and
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10 * removing any trace of my name from the source (although I hope you won't
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11 * do that). I welcome enhancements and corrections to this file, but I do
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12 * not require you to send me patches if you make changes.
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13 *
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14 * Unless otherwise stated, the rest of PhysicsFS falls under the GNU Lesser
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15 * General Public License: http://www.gnu.org/licenses/lgpl.txt
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16 *
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17 * SDL falls under the LGPL, too. You can get SDL at http://www.libsdl.org/
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18 *
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19 * This file was written by Ryan C. Gordon. (icculus@icculus.org).
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20 */
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21
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22 #if SUPPORT_PHYSFS
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23
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24 #include <stdio.h> /* used for SEEK_SET, SEEK_CUR, SEEK_END ... */
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25 #include "physfsrwops.h"
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26
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27 static int physfsrwops_seek(SDL_RWops *rw, int offset, int whence)
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28 {
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29 PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1;
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30 int pos = 0;
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31
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32 if (whence == SEEK_SET)
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33 {
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34 pos = offset;
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35 } /* if */
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36
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37 else if (whence == SEEK_CUR)
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38 {
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39 PHYSFS_sint64 current = PHYSFS_tell(handle);
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40 if (current == -1)
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41 {
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42 SDL_SetError("Can't find position in file: %s",
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43 PHYSFS_getLastError());
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44 return(-1);
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45 } /* if */
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46
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47 pos = (int) current;
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48 if ( ((PHYSFS_sint64) pos) != current )
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49 {
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50 SDL_SetError("Can't fit current file position in an int!");
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51 return(-1);
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52 } /* if */
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53
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54 if (offset == 0) /* this is a "tell" call. We're done. */
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55 return(pos);
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56
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57 pos += offset;
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58 } /* else if */
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59
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60 else if (whence == SEEK_END)
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61 {
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62 PHYSFS_sint64 len = PHYSFS_fileLength(handle);
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63 if (len == -1)
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64 {
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65 SDL_SetError("Can't find end of file: %s", PHYSFS_getLastError());
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66 return(-1);
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67 } /* if */
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68
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69 pos = (int) len;
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70 if ( ((PHYSFS_sint64) pos) != len )
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71 {
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72 SDL_SetError("Can't fit end-of-file position in an int!");
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73 return(-1);
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74 } /* if */
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75
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76 pos += offset;
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77 } /* else if */
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78
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79 else
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80 {
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81 SDL_SetError("Invalid 'whence' parameter.");
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82 return(-1);
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83 } /* else */
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84
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85 if ( pos < 0 )
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86 {
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87 SDL_SetError("Attempt to seek past start of file.");
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88 return(-1);
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89 } /* if */
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90
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91 if (!PHYSFS_seek(handle, (PHYSFS_uint64) pos))
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92 {
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93 SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
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94 return(-1);
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95 } /* if */
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96
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97 return(pos);
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98 } /* physfsrwops_seek */
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99
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100
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101 static int physfsrwops_read(SDL_RWops *rw, void *ptr, int size, int maxnum)
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102 {
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103 PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1;
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104 PHYSFS_sint64 rc = PHYSFS_read(handle, ptr, size, maxnum);
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105 if (rc != maxnum)
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106 {
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107 if (!PHYSFS_eof(handle)) /* not EOF? Must be an error. */
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108 SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
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109 } /* if */
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110
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111 return((int) rc);
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112 } /* physfsrwops_read */
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113
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114
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115 static int physfsrwops_write(SDL_RWops *rw, const void *ptr, int size, int num)
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116 {
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117 PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1;
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118 PHYSFS_sint64 rc = PHYSFS_write(handle, ptr, size, num);
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119 if (rc != num)
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120 SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
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121
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122 return((int) rc);
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123 } /* physfsrwops_write */
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124
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125
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126 static int physfsrwops_close(SDL_RWops *rw)
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127 {
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128 PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1;
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129 if (!PHYSFS_close(handle))
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130 {
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131 SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
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132 return(-1);
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133 } /* if */
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134
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135 SDL_FreeRW(rw);
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136 return(0);
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137 } /* physfsrwops_close */
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138
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139
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140 static SDL_RWops *create_rwops(PHYSFS_file *handle)
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141 {
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142 SDL_RWops *retval = NULL;
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143
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144 if (handle == NULL)
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145 SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
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146 else
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147 {
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148 retval = SDL_AllocRW();
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149 if (retval != NULL)
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150 {
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151 retval->seek = physfsrwops_seek;
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152 retval->read = physfsrwops_read;
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153 retval->write = physfsrwops_write;
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154 retval->close = physfsrwops_close;
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155 retval->hidden.unknown.data1 = handle;
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156 } /* if */
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157 } /* else */
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158
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159 return(retval);
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160 } /* create_rwops */
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161
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162
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163 SDL_RWops *PHYSFSRWOPS_makeRWops(PHYSFS_file *handle)
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164 {
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165 SDL_RWops *retval = NULL;
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166 if (handle == NULL)
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167 SDL_SetError("NULL pointer passed to PHYSFSRWOPS_makeRWops().");
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168 else
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169 retval = create_rwops(handle);
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170
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171 return(retval);
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172 } /* PHYSFSRWOPS_makeRWops */
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173
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174
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175 SDL_RWops *PHYSFSRWOPS_openRead(const char *fname)
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176 {
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177 return(create_rwops(PHYSFS_openRead(fname)));
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178 } /* PHYSFSRWOPS_openRead */
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179
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180
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181 SDL_RWops *PHYSFSRWOPS_openWrite(const char *fname)
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182 {
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183 return(create_rwops(PHYSFS_openWrite(fname)));
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184 } /* PHYSFSRWOPS_openWrite */
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185
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186
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187 SDL_RWops *PHYSFSRWOPS_openAppend(const char *fname)
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188 {
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189 return(create_rwops(PHYSFS_openAppend(fname)));
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190 } /* PHYSFSRWOPS_openAppend */
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191
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192 #endif
286
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193
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194 /* end of physfsrwops.c ... */
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195