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annotate src/fileio.cpp @ 6248:0789677a15a0 draft

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(svn r9051) -Codechange: typedef [enum|struct] Y {} X; -> [enum|struct] X {};
author rubidium <rubidium@openttd.org>
date Wed, 07 Mar 2007 12:11:48 +0000 (2007-03-07)
parents 57363e064324
children bd24b660fbe8
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1 /* $Id$ */
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3 /** @file fileio.cpp Standard In/Out file operations */
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4
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5 #include "stdafx.h"
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6 #include "openttd.h"
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7 #include "fileio.h"
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8 #include "functions.h"
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9 #include "string.h"
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10 #include "macros.h"
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11 #include "variables.h"
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12 #include "debug.h"
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14 /*************************************************/
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15 /* FILE IO ROUTINES ******************************/
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16 /*************************************************/
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18 #define FIO_BUFFER_SIZE 512
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19 #define MAX_HANDLES 64
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21 struct Fio {
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22 byte *buffer, *buffer_end; ///< position pointer in local buffer and last valid byte of buffer
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23 uint32 pos; ///< current (system) position in file
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24 FILE *cur_fh; ///< current file handle
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25 FILE *handles[MAX_HANDLES]; ///< array of file handles we can have open
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26 byte buffer_start[FIO_BUFFER_SIZE]; ///< local buffer when read from file
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27 #if defined(LIMITED_FDS)
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28 uint open_handles; ///< current amount of open handles
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29 const char *filename[MAX_HANDLES]; ///< array of filenames we (should) have open
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30 uint usage_count[MAX_HANDLES]; ///< count how many times this file has been opened
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31 #endif /* LIMITED_FDS */
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32 };
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33
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34 static Fio _fio;
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36 /* Get current position in file */
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37 uint32 FioGetPos()
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38 {
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39 return _fio.pos + (_fio.buffer - _fio.buffer_start) - FIO_BUFFER_SIZE;
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40 }
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42 void FioSeekTo(uint32 pos, int mode)
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43 {
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44 if (mode == SEEK_CUR) pos += FioGetPos();
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45 _fio.buffer = _fio.buffer_end = _fio.buffer_start + FIO_BUFFER_SIZE;
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46 _fio.pos = pos;
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47 fseek(_fio.cur_fh, _fio.pos, SEEK_SET);
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48 }
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49
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50 #if defined(LIMITED_FDS)
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51 static void FioRestoreFile(int slot)
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52 {
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53 /* Do we still have the file open, or should we reopen it? */
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54 if (_fio.handles[slot] == NULL) {
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55 DEBUG(misc, 6, "Restoring file '%s' in slot '%d' from disk", _fio.filename[slot], slot);
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56 FioOpenFile(slot, _fio.filename[slot]);
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57 }
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58 _fio.usage_count[slot]++;
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59 }
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60 #endif /* LIMITED_FDS */
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61
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62 /* Seek to a file and a position */
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63 void FioSeekToFile(uint32 pos)
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64 {
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65 FILE *f;
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66 #if defined(LIMITED_FDS)
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67 /* Make sure we have this file open */
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68 FioRestoreFile(pos >> 24);
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69 #endif /* LIMITED_FDS */
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70 f = _fio.handles[pos >> 24];
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71 assert(f != NULL);
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72 _fio.cur_fh = f;
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73 FioSeekTo(GB(pos, 0, 24), SEEK_SET);
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74 }
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75
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76 byte FioReadByte()
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77 {
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78 if (_fio.buffer == _fio.buffer_end) {
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79 _fio.pos += FIO_BUFFER_SIZE;
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80 fread(_fio.buffer = _fio.buffer_start, 1, FIO_BUFFER_SIZE, _fio.cur_fh);
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81 }
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82 return *_fio.buffer++;
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83 }
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85 void FioSkipBytes(int n)
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86 {
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87 for (;;) {
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88 int m = min(_fio.buffer_end - _fio.buffer, n);
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89 _fio.buffer += m;
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90 n -= m;
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91 if (n == 0) break;
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92 FioReadByte();
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93 n--;
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94 }
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95 }
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96
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97 uint16 FioReadWord()
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98 {
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99 byte b = FioReadByte();
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100 return (FioReadByte() << 8) | b;
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101 }
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102
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103 uint32 FioReadDword()
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104 {
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105 uint b = FioReadWord();
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106 return (FioReadWord() << 16) | b;
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107 }
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108
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109 void FioReadBlock(void *ptr, uint size)
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110 {
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111 FioSeekTo(FioGetPos(), SEEK_SET);
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112 _fio.pos += size;
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113 fread(ptr, 1, size, _fio.cur_fh);
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114 }
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115
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116 static inline void FioCloseFile(int slot)
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117 {
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118 if (_fio.handles[slot] != NULL) {
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119 fclose(_fio.handles[slot]);
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120 _fio.handles[slot] = NULL;
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121 #if defined(LIMITED_FDS)
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122 _fio.open_handles--;
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123 #endif /* LIMITED_FDS */
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124 }
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125 }
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126
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127 void FioCloseAll()
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128 {
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129 int i;
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130
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131 for (i = 0; i != lengthof(_fio.handles); i++)
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132 FioCloseFile(i);
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133 }
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134
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135 bool FioCheckFileExists(const char *filename)
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136 {
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137 FILE *f = FioFOpenFile(filename);
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138 if (f == NULL) return false;
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139
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140 fclose(f);
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141 return true;
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142 }
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143
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144 #if defined(LIMITED_FDS)
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145 static void FioFreeHandle()
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146 {
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147 /* If we are about to open a file that will exceed the limit, close a file */
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148 if (_fio.open_handles + 1 == LIMITED_FDS) {
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149 uint i, count;
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150 int slot;
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151
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152 count = UINT_MAX;
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153 slot = -1;
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154 /* Find the file that is used the least */
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155 for (i = 0; i < lengthof(_fio.handles); i++) {
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156 if (_fio.handles[i] != NULL && _fio.usage_count[i] < count) {
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157 count = _fio.usage_count[i];
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158 slot = i;
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159 }
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160 }
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161 assert(slot != -1);
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162 DEBUG(misc, 6, "Closing filehandler '%s' in slot '%d' because of fd-limit", _fio.filename[slot], slot);
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163 FioCloseFile(slot);
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164 }
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165 }
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166 #endif /* LIMITED_FDS */
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167
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168 FILE *FioFOpenFile(const char *filename)
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169 {
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170 FILE *f;
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171 char buf[MAX_PATH];
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172
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173 snprintf(buf, lengthof(buf), "%s%s", _paths.data_dir, filename);
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174
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175 f = fopen(buf, "rb");
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176 #if !defined(WIN32)
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177 if (f == NULL) {
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178 strtolower(buf + strlen(_paths.data_dir) - 1);
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179 f = fopen(buf, "rb");
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180
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181 #if defined SECOND_DATA_DIR
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182 /* tries in the 2nd data directory */
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183 if (f == NULL) {
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184 snprintf(buf, lengthof(buf), "%s%s", _paths.second_data_dir, filename);
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185 strtolower(buf + strlen(_paths.second_data_dir) - 1);
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186 f = fopen(buf, "rb");
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187 }
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188 #endif
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189 }
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190 #endif
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191
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192 return f;
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193 }
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194
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195 void FioOpenFile(int slot, const char *filename)
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196 {
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197 FILE *f;
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198
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199 #if defined(LIMITED_FDS)
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200 FioFreeHandle();
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201 #endif /* LIMITED_FDS */
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202 f = FioFOpenFile(filename);
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203 if (f == NULL) error("Cannot open file '%s%s'", _paths.data_dir, filename);
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204
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205 FioCloseFile(slot); // if file was opened before, close it
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206 _fio.handles[slot] = f;
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207 #if defined(LIMITED_FDS)
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diff changeset
208 _fio.filename[slot] = filename;
0516aee3881f (svn r8647) -Codechange: add a general way to handle platforms who can only have a limited amount of file-descripters open at any given time.
truelight <truelight@openttd.org>
parents: 5584
diff changeset
209 _fio.usage_count[slot] = 0;
0516aee3881f (svn r8647) -Codechange: add a general way to handle platforms who can only have a limited amount of file-descripters open at any given time.
truelight <truelight@openttd.org>
parents: 5584
diff changeset
210 _fio.open_handles++;
0516aee3881f (svn r8647) -Codechange: add a general way to handle platforms who can only have a limited amount of file-descripters open at any given time.
truelight <truelight@openttd.org>
parents: 5584
diff changeset
211 #endif /* LIMITED_FDS */
5584
4b26bd55bd24 (svn r8033) [cpp] - Prepare for merge from branches/cpp (all .c files renamed to .cpp)
KUDr <KUDr@openttd.org>
parents:
diff changeset
212 FioSeekToFile(slot << 24);
4b26bd55bd24 (svn r8033) [cpp] - Prepare for merge from branches/cpp (all .c files renamed to .cpp)
KUDr <KUDr@openttd.org>
parents:
diff changeset
213 }