286
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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@clutteredmind.org).
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20 */
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21
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22 #include <stdio.h> /* used for SEEK_SET, SEEK_CUR, SEEK_END ... */
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23 #include "physfsrwops.h"
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24
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25 static int physfsrwops_seek(SDL_RWops *rw, int offset, int whence)
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26 {
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27 PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1;
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28 int pos = 0;
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29
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30 if (whence == SEEK_SET)
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31 {
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32 pos = offset;
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33 } /* if */
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34
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35 else if (whence == SEEK_CUR)
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36 {
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37 int current = PHYSFS_tell(handle);
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38 if (current == -1)
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39 {
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40 SDL_SetError("Can't find position in file: %s",
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41 PHYSFS_getLastError());
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42 return(-1);
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43 } /* if */
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44
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45 if (offset == 0) /* this is a "tell" call. We're done. */
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46 return(offset);
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47
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48 pos = current + offset;
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49 } /* else if */
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50
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51 else if (whence == SEEK_END)
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52 {
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53 int len = PHYSFS_fileLength(handle);
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54 if (len == -1)
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55 {
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56 SDL_SetError("Can't find end of file: %s", PHYSFS_getLastError());
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57 return(-1);
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58 } /* if */
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59
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60 pos = len + offset;
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61 } /* else if */
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62
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63 else
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64 {
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65 SDL_SetError("Invalid 'whence' parameter.");
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66 return(-1);
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67 } /* else */
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68
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69 if (!PHYSFS_seek(handle, pos))
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70 {
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71 SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
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72 return(-1);
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73 } /* if */
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74
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75 return(pos);
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76 } /* physfsrwops_seek */
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77
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78
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79 static int physfsrwops_read(SDL_RWops *rw, void *ptr, int size, int maxnum)
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80 {
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81 PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1;
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82 int rc = PHYSFS_read(handle, ptr, size, maxnum);
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83 if (rc != maxnum)
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84 {
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85 if (!PHYSFS_eof(handle)) /* not EOF? Must be an error. */
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86 SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
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87 } /* if */
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88
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89 return(rc);
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90 } /* physfsrwops_read */
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91
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92
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93 static int physfsrwops_write(SDL_RWops *rw, const void *ptr, int size, int num)
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94 {
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95 PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1;
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96 int rc = PHYSFS_write(handle, ptr, size, num);
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97 if (rc != num)
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98 SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
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99
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100 return(rc);
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101 } /* physfsrwops_write */
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102
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103
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104 static int physfsrwops_close(SDL_RWops *rw)
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105 {
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106 PHYSFS_file *handle = (PHYSFS_file *) rw->hidden.unknown.data1;
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107 if (!PHYSFS_close(handle))
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108 {
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109 SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
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110 return(-1);
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111 } /* if */
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112
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113 SDL_FreeRW(rw);
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114 return(0);
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115 } /* physfsrwops_close */
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116
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117
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118 static SDL_RWops *create_rwops(PHYSFS_file *handle)
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119 {
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120 SDL_RWops *retval = NULL;
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121
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122 if (handle == NULL)
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123 SDL_SetError("PhysicsFS error: %s", PHYSFS_getLastError());
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124 else
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125 {
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126 retval = SDL_AllocRW();
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127 if (retval != NULL)
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128 {
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129 retval->seek = physfsrwops_seek;
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130 retval->read = physfsrwops_read;
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131 retval->write = physfsrwops_write;
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132 retval->close = physfsrwops_close;
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133 retval->hidden.unknown.data1 = handle;
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134 } /* if */
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135 } /* else */
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136
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137 return(retval);
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138 } /* create_rwops */
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139
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140
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141 SDL_RWops *PHYSFSRWOPS_makeRWops(PHYSFS_file *handle)
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142 {
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143 SDL_RWops *retval = NULL;
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144 if (handle == NULL)
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145 SDL_SetError("NULL pointer passed to PHYSFSRWOPS_makeRWops().");
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146 else
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147 retval = create_rwops(handle);
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148
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149 return(retval);
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150 } /* PHYSFSRWOPS_makeRWops */
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151
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152
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153 SDL_RWops *PHYSFSRWOPS_openRead(const char *fname)
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154 {
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155 return(create_rwops(PHYSFS_openRead(fname)));
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156 } /* PHYSFSRWOPS_openRead */
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157
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158
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159 SDL_RWops *PHYSFSRWOPS_openWrite(const char *fname)
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160 {
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161 return(create_rwops(PHYSFS_openWrite(fname)));
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162 } /* PHYSFSRWOPS_openWrite */
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163
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164
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165 SDL_RWops *PHYSFSRWOPS_openAppend(const char *fname)
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166 {
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167 return(create_rwops(PHYSFS_openAppend(fname)));
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168 } /* PHYSFSRWOPS_openAppend */
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169
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170
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171 /* end of physfsrwops.c ... */
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172
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