Mercurial > projects > ldc
annotate lphobos/std/mmfile.d @ 978:6a32d2e18175
Fix a latent bug in the asm code.
I think that technically, using "*m0" instead of "*0" allows LLVM to pick
between using the same memory as output 0 and using a new memory location.
(So far I haven't been able to construct a testcase that actually breaks
because of this, though)
author | Frits van Bommel <fvbommel wxs.nl> |
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date | Wed, 18 Feb 2009 03:38:12 +0100 |
parents | 88e23f8c2354 |
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rev | line source |
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1 /* Copyright 2004-2005 by Digital Mars |
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2 * Written by Walter Bright and Matthew Wilson |
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3 * |
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4 * This software is provided 'as-is', without any express or implied |
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5 * warranty. In no event will the authors be held liable for any damages |
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6 * arising from the use of this software. |
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7 * |
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8 * Permission is granted to anyone to use this software for any purpose, |
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9 * including commercial applications, and to alter it and redistribute it |
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10 * freely, in both source and binary form, subject to the following |
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11 * restrictions: |
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12 * |
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13 * - The origin of this software must not be misrepresented; you must not |
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14 * claim that you wrote the original software. If you use this software |
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15 * in a product, an acknowledgment in the product documentation would be |
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16 * appreciated but is not required. |
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17 * - Altered source versions must be plainly marked as such, and must not |
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18 * be misrepresented as being the original software. |
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19 * - This notice may not be removed or altered from any source |
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20 * distribution. |
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21 * |
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22 */ |
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23 |
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24 /** |
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25 * Read and write memory mapped files. |
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26 * Macros: |
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27 * WIKI=Phobos/StdMmfile |
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28 */ |
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29 |
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30 /* NOTE: This file has been patched from the original DMD distribution to |
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31 work with the GDC compiler. |
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32 |
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33 Modified by David Friedman, September 2004 |
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34 */ |
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35 |
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36 module std.mmfile; |
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37 |
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38 private import std.c.stdio; |
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39 private import std.c.stdlib; |
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40 private import std.string; |
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41 |
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42 version(linux) version = Unix; |
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43 |
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44 //debug = MMFILE; |
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45 |
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46 version (Win32) |
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47 { |
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48 private import std.c.windows.windows; |
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49 private import std.utf; |
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50 |
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51 private uint dwVersion; |
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52 |
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53 static this() |
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54 { // http://msdn.microsoft.com/library/default.asp?url=/library/en-us/sysinfo/base/getversion.asp |
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55 dwVersion = GetVersion(); |
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56 } |
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57 |
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58 private const bool Have_MMFile = true; // private for now... |
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59 } |
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60 else version (Unix) |
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61 { |
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62 version (/*GNU_Unix_Have_MMap*/Unix) |
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63 { |
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64 version(linux) { |
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65 import std.c.linux.linux; |
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66 alias std.c.linux.linux unix; |
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67 } else { |
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68 private import std.c.unix.unix; |
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69 alias std.c.unix.unix unix; |
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70 } |
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71 |
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72 version = unix_mm; |
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73 private const bool Have_MMFile = true; |
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74 } |
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75 else |
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76 { |
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77 private const bool Have_MMFile = false; |
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78 } |
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79 |
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80 } |
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81 else |
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82 { |
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83 private const bool Have_MMFile = false; |
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84 // Can't simply fail because std.stream imports this module. |
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85 //static assert(0); |
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86 } |
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87 |
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88 static if (Have_MMFile) |
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89 { |
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90 private import std.file; |
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91 private import std.path; |
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92 } |
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93 |
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94 /** |
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95 * MmFile objects control the memory mapped file resource. |
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96 */ |
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97 class MmFile |
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98 { |
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99 /** |
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100 * The mode the memory mapped file is opened with. |
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101 */ |
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102 enum Mode |
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103 { Read, /// read existing file |
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104 ReadWriteNew, /// delete existing file, write new file |
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105 ReadWrite, /// read/write existing file, create if not existing |
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106 ReadCopyOnWrite, /// read/write existing file, copy on write |
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107 } |
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108 |
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109 /** |
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110 * Open memory mapped file filename for reading. |
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111 * File is closed when the object instance is deleted. |
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112 * Throws: |
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113 * std.file.FileException |
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114 */ |
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115 this(char[] filename) |
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116 { |
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117 this(filename, Mode.Read, 0, null); |
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118 } |
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119 |
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120 /** |
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121 * Open memory mapped file filename in mode. |
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122 * File is closed when the object instance is deleted. |
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123 * Params: |
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124 * filename = name of the file. |
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125 * If null, an anonymous file mapping is created. |
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126 * mode = access mode defined above. |
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127 * size = the size of the file. If 0, it is taken to be the |
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128 * size of the existing file. |
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129 * address = the preferred address to map the file to, |
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130 * although the system is not required to honor it. |
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131 * If null, the system selects the most convenient address. |
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132 * window = preferred block size of the amount of data to map at one time |
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133 * with 0 meaning map the entire file. The window size must be a |
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134 * multiple of the memory allocation page size. |
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135 * Throws: |
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136 * std.file.FileException |
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137 */ |
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138 this(char[] filename, Mode mode, ulong size, void* address, |
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139 size_t window = 0) |
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140 { |
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141 this.filename = filename; |
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142 this.mMode = mode; |
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143 this.window = window; |
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144 this.address = address; |
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145 |
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146 version (Win32) |
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147 { |
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148 void* p; |
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149 uint dwDesiredAccess2; |
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150 uint dwShareMode; |
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151 uint dwCreationDisposition; |
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152 uint flProtect; |
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153 |
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154 if (dwVersion & 0x80000000 && (dwVersion & 0xFF) == 3) |
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155 { |
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156 throw new FileException(filename, |
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157 "Win32s does not implement mm files"); |
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158 } |
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159 |
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160 switch (mode) |
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161 { |
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162 case Mode.Read: |
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163 dwDesiredAccess2 = GENERIC_READ; |
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164 dwShareMode = FILE_SHARE_READ; |
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165 dwCreationDisposition = OPEN_EXISTING; |
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166 flProtect = PAGE_READONLY; |
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167 dwDesiredAccess = FILE_MAP_READ; |
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168 break; |
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169 |
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170 case Mode.ReadWriteNew: |
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171 assert(size != 0); |
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172 dwDesiredAccess2 = GENERIC_READ | GENERIC_WRITE; |
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173 dwShareMode = FILE_SHARE_READ | FILE_SHARE_WRITE; |
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174 dwCreationDisposition = CREATE_ALWAYS; |
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175 flProtect = PAGE_READWRITE; |
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176 dwDesiredAccess = FILE_MAP_WRITE; |
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177 break; |
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178 |
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179 case Mode.ReadWrite: |
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180 dwDesiredAccess2 = GENERIC_READ | GENERIC_WRITE; |
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181 dwShareMode = FILE_SHARE_READ | FILE_SHARE_WRITE; |
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182 dwCreationDisposition = OPEN_ALWAYS; |
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183 flProtect = PAGE_READWRITE; |
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184 dwDesiredAccess = FILE_MAP_WRITE; |
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185 break; |
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186 |
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187 case Mode.ReadCopyOnWrite: |
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188 if (dwVersion & 0x80000000) |
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189 { |
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190 throw new FileException(filename, |
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191 "Win9x does not implement copy on write"); |
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192 } |
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193 dwDesiredAccess2 = GENERIC_READ | GENERIC_WRITE; |
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194 dwShareMode = FILE_SHARE_READ | FILE_SHARE_WRITE; |
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195 dwCreationDisposition = OPEN_EXISTING; |
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196 flProtect = PAGE_WRITECOPY; |
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197 dwDesiredAccess = FILE_MAP_COPY; |
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198 break; |
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199 |
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200 default: |
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201 assert(0); |
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|
202 } |
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203 |
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204 if (filename) |
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205 { |
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206 if (useWfuncs) |
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207 { |
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208 auto namez = std.utf.toUTF16z(filename); |
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209 hFile = CreateFileW(namez, |
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210 dwDesiredAccess2, |
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211 dwShareMode, |
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212 null, |
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213 dwCreationDisposition, |
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214 FILE_ATTRIBUTE_NORMAL, |
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215 cast(HANDLE)null); |
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216 } |
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217 else |
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218 { |
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219 auto namez = std.file.toMBSz(filename); |
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220 hFile = CreateFileA(namez, |
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221 dwDesiredAccess2, |
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222 dwShareMode, |
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223 null, |
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224 dwCreationDisposition, |
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225 FILE_ATTRIBUTE_NORMAL, |
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226 cast(HANDLE)null); |
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227 } |
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228 if (hFile == INVALID_HANDLE_VALUE) |
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229 goto err1; |
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230 } |
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231 else |
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232 hFile = null; |
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233 |
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234 int hi = cast(int)(size>>32); |
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235 hFileMap = CreateFileMappingA(hFile, null, flProtect, hi, cast(uint)size, null); |
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236 if (hFileMap == null) // mapping failed |
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237 goto err1; |
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238 |
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239 if (size == 0) |
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240 { |
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|
241 uint sizehi; |
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242 uint sizelow = GetFileSize(hFile,&sizehi); |
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243 size = (cast(ulong)sizehi << 32) + sizelow; |
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244 } |
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245 this.size = size; |
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246 |
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247 size_t initial_map = (window && 2*window<size)? 2*window : cast(size_t)size; |
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248 p = MapViewOfFileEx(hFileMap, dwDesiredAccess, 0, 0, initial_map, address); |
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249 if (!p) goto err1; |
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250 data = p[0 .. initial_map]; |
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251 |
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252 debug (MMFILE) printf("MmFile.this(): p = %p, size = %d\n", p, size); |
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changeset
|
253 return; |
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diff
changeset
|
254 |
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255 err1: |
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256 if (hFileMap != null) |
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257 CloseHandle(hFileMap); |
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258 hFileMap = null; |
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259 |
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260 if (hFile != INVALID_HANDLE_VALUE) |
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261 CloseHandle(hFile); |
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262 hFile = INVALID_HANDLE_VALUE; |
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263 |
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264 errNo(); |
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265 } |
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266 else version (unix_mm) |
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267 { |
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268 char* namez = toStringz(filename); |
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269 void* p; |
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270 int oflag; |
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271 int fmode; |
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272 |
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273 switch (mode) |
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274 { |
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275 case Mode.Read: |
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276 flags = MAP_SHARED; |
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277 prot = PROT_READ; |
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278 oflag = O_RDONLY; |
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279 fmode = 0; |
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280 break; |
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281 |
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282 case Mode.ReadWriteNew: |
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283 assert(size != 0); |
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284 flags = MAP_SHARED; |
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285 prot = PROT_READ | PROT_WRITE; |
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286 oflag = O_CREAT | O_RDWR | O_TRUNC; |
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287 fmode = 0660; |
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288 break; |
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289 |
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290 case Mode.ReadWrite: |
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291 flags = MAP_SHARED; |
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292 prot = PROT_READ | PROT_WRITE; |
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293 oflag = O_CREAT | O_RDWR; |
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294 fmode = 0660; |
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295 break; |
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296 |
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297 case Mode.ReadCopyOnWrite: |
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298 flags = MAP_PRIVATE; |
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299 prot = PROT_READ | PROT_WRITE; |
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300 oflag = O_RDWR; |
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301 fmode = 0; |
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302 break; |
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303 |
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304 default: |
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305 assert(0); |
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306 } |
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307 |
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308 if (filename.length) |
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309 { |
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310 struct_stat statbuf; |
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311 |
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312 fd = unix.open(namez, oflag, fmode); |
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313 if (fd == -1) |
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314 { |
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315 // printf("\topen error, errno = %d\n",getErrno()); |
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316 errNo(); |
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317 } |
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318 |
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319 if (unix.fstat(fd, &statbuf)) |
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320 { |
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321 //printf("\tfstat error, errno = %d\n",getErrno()); |
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322 unix.close(fd); |
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323 errNo(); |
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324 } |
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325 |
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326 if (prot & PROT_WRITE && size > statbuf.st_size) |
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327 { |
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328 // Need to make the file size bytes big |
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329 unix.lseek(fd, cast(off_t)(size - 1), SEEK_SET); |
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330 char c = 0; |
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331 unix.write(fd, &c, 1); |
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332 } |
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333 else if (prot & PROT_READ && size == 0) |
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334 size = statbuf.st_size; |
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335 } |
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336 else |
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337 { |
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338 fd = -1; |
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339 flags |= MAP_ANONYMOUS; |
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340 } |
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341 this.size = size; |
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342 size_t initial_map = (window && 2*window<size)? 2*window : cast(size_t)size; |
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343 p = mmap(address, initial_map, prot, flags, fd, 0); |
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344 if (p == MAP_FAILED) { |
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345 if (fd != -1) |
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346 unix.close(fd); |
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347 errNo(); |
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348 } |
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349 |
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350 data = p[0 .. initial_map]; |
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351 } |
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352 else static if (! Have_MMFile) |
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353 { |
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354 throw new FileException("This system does support memory mapped files"); |
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355 } |
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356 else |
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357 { |
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358 static assert(0); |
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359 } |
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360 } |
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361 |
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362 /** |
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363 * Flushes pending output and closes the memory mapped file. |
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364 */ |
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365 ~this() |
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366 { |
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367 debug (MMFILE) printf("MmFile.~this()\n"); |
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368 unmap(); |
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369 version (Win32) |
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370 { |
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371 if (hFileMap != null && CloseHandle(hFileMap) != TRUE) |
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372 errNo(); |
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373 hFileMap = null; |
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374 |
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375 if (hFile != INVALID_HANDLE_VALUE && CloseHandle(hFile) != TRUE) |
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376 errNo(); |
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377 hFile = INVALID_HANDLE_VALUE; |
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378 } |
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379 else version (unix_mm) |
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380 { |
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381 if (fd != -1 && unix.close(fd) == -1) |
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382 errNo(); |
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383 fd = -1; |
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384 } |
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385 else static if (! Have_MMFile) |
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386 { |
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387 } |
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388 else |
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389 { |
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390 static assert(0); |
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391 } |
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392 data = null; |
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393 } |
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394 |
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395 /* Flush any pending output. |
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396 */ |
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397 void flush() |
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398 { |
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399 debug (MMFILE) printf("MmFile.flush()\n"); |
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400 version (Win32) |
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401 { |
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402 FlushViewOfFile(data.ptr, data.length); |
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403 } |
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404 else version (unix_mm) |
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405 { |
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406 int i; |
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407 |
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408 i = msync(cast(void*)data, data.length, MS_SYNC); // sys/mman.h |
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409 if (i != 0) |
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410 errNo(); |
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411 } |
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412 else static if (! Have_MMFile) |
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413 { |
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414 } |
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415 else |
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416 { |
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417 static assert(0); |
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418 } |
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419 } |
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420 |
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421 /** |
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422 * Gives size in bytes of the memory mapped file. |
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423 */ |
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424 ulong length() |
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425 { |
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426 debug (MMFILE) printf("MmFile.length()\n"); |
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427 return size; |
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428 } |
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429 |
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430 /** |
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431 * Read-only property returning the file mode. |
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432 */ |
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433 Mode mode() |
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434 { |
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435 debug (MMFILE) printf("MmFile.mode()\n"); |
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436 return mMode; |
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437 } |
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438 |
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439 /** |
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440 * Returns entire file contents as an array. |
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441 */ |
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442 void[] opSlice() |
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443 { |
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444 debug (MMFILE) printf("MmFile.opSlice()\n"); |
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445 return opSlice(0,size); |
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446 } |
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447 |
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448 /** |
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449 * Returns slice of file contents as an array. |
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450 */ |
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451 void[] opSlice(ulong i1, ulong i2) |
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452 { |
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453 debug (MMFILE) printf("MmFile.opSlice(%lld, %lld)\n", i1, i2); |
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454 ensureMapped(i1,i2); |
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455 size_t off1 = cast(size_t)(i1-start); |
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456 size_t off2 = cast(size_t)(i2-start); |
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457 return data[off1 .. off2]; |
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458 } |
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459 |
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460 /** |
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461 * Returns byte at index i in file. |
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462 */ |
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463 ubyte opIndex(ulong i) |
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464 { |
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465 debug (MMFILE) printf("MmFile.opIndex(%lld)\n", i); |
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466 ensureMapped(i); |
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467 size_t off = cast(size_t)(i-start); |
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468 return (cast(ubyte[])data)[off]; |
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469 } |
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470 |
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471 /** |
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472 * Sets and returns byte at index i in file to value. |
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473 */ |
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474 ubyte opIndexAssign(ubyte value, ulong i) |
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475 { |
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476 debug (MMFILE) printf("MmFile.opIndex(%lld, %d)\n", i, value); |
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477 ensureMapped(i); |
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478 size_t off = cast(size_t)(i-start); |
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479 return (cast(ubyte[])data)[off] = value; |
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480 } |
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481 |
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482 |
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483 // return true if the given position is currently mapped |
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484 private int mapped(ulong i) |
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485 { |
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486 debug (MMFILE) printf("MmFile.mapped(%lld, %lld, %d)\n", i,start, |
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487 data.length); |
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488 return i >= start && i < start+data.length; |
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489 } |
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490 |
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491 // unmap the current range |
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492 private void unmap() |
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493 { |
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494 debug (MMFILE) printf("MmFile.unmap()\n"); |
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495 version(Windows) { |
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496 /* Note that under Windows 95, UnmapViewOfFile() seems to return |
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497 * random values, not TRUE or FALSE. |
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498 */ |
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499 if (data && UnmapViewOfFile(data.ptr) == FALSE && |
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500 (dwVersion & 0x80000000) == 0) |
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501 errNo(); |
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502 } else version (unix_mm) { |
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503 if (data && munmap(cast(void*)data, data.length) != 0) |
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504 errNo(); |
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505 } |
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506 data = null; |
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507 } |
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508 |
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509 // map range |
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510 private void map(ulong start, size_t len) |
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511 { |
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512 debug (MMFILE) printf("MmFile.map(%lld, %d)\n", start, len); |
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513 void* p; |
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514 if (start+len > size) |
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515 len = cast(size_t)(size-start); |
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516 version(Windows) { |
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517 uint hi = cast(uint)(start>>32); |
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518 p = MapViewOfFileEx(hFileMap, dwDesiredAccess, hi, cast(uint)start, len, address); |
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519 if (!p) errNo(); |
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520 } else version (unix_mm) { |
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521 p = mmap(address, len, prot, flags, fd, cast(off_t)start); |
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522 if (p == MAP_FAILED) errNo(); |
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523 } |
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524 data = p[0 .. len]; |
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525 this.start = start; |
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526 } |
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|
527 |
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|
528 // ensure a given position is mapped |
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529 private void ensureMapped(ulong i) |
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530 { |
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531 debug (MMFILE) printf("MmFile.ensureMapped(%lld)\n", i); |
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532 if (!mapped(i)) { |
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533 unmap(); |
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534 if (window == 0) { |
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535 map(0,cast(size_t)size); |
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536 } else { |
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537 ulong block = i/window; |
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538 if (block == 0) |
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539 map(0,2*window); |
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540 else |
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541 map(window*(block-1),3*window); |
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542 } |
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543 } |
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parents:
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544 } |
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545 |
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546 // ensure a given range is mapped |
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547 private void ensureMapped(ulong i, ulong j) |
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548 { |
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549 debug (MMFILE) printf("MmFile.ensureMapped(%lld, %lld)\n", i, j); |
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550 if (!mapped(i) || !mapped(j-1)) { |
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551 unmap(); |
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diff
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552 if (window == 0) { |
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553 map(0,cast(size_t)size); |
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554 } else { |
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555 ulong iblock = i/window; |
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parents:
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556 ulong jblock = (j-1)/window; |
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557 if (iblock == 0) { |
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558 map(0,cast(size_t)(window*(jblock+2))); |
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559 } else { |
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parents:
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|
560 map(window*(iblock-1),cast(size_t)(window*(jblock-iblock+3))); |
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diff
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|
561 } |
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562 } |
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parents:
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563 } |
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parents:
diff
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|
564 } |
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diff
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|
565 |
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566 private: |
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567 char[] filename; |
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568 void[] data; |
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569 ulong start; |
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570 size_t window; |
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571 ulong size; |
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572 Mode mMode; |
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573 void* address; |
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|
574 |
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|
575 version (Win32) |
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576 { |
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577 HANDLE hFile = INVALID_HANDLE_VALUE; |
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578 HANDLE hFileMap = null; |
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|
579 uint dwDesiredAccess; |
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|
580 } |
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parents:
diff
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|
581 else version (unix_mm) |
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parents:
diff
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582 { |
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583 int fd; |
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584 int prot; |
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|
585 int flags; |
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diff
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|
586 int fmode; |
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587 } |
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parents:
diff
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|
588 else static if (! Have_MMFile) |
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parents:
diff
changeset
|
589 { |
373489eeaf90
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parents:
diff
changeset
|
590 } |
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Applied downs' lphobos update
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parents:
diff
changeset
|
591 else |
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parents:
diff
changeset
|
592 { |
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parents:
diff
changeset
|
593 static assert(0); |
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parents:
diff
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|
594 } |
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parents:
diff
changeset
|
595 |
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parents:
diff
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596 // Report error, where errno gives the error number |
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597 void errNo() |
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parents:
diff
changeset
|
598 { |
373489eeaf90
Applied downs' lphobos update
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changeset
|
599 version (Win32) |
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changeset
|
600 { |
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Applied downs' lphobos update
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parents:
diff
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|
601 throw new FileException(filename, GetLastError()); |
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diff
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|
602 } |
373489eeaf90
Applied downs' lphobos update
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parents:
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|
603 else version (Unix) |
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diff
changeset
|
604 { |
373489eeaf90
Applied downs' lphobos update
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|
605 throw new FileException(filename, getErrno()); |
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Applied downs' lphobos update
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changeset
|
606 } |
373489eeaf90
Applied downs' lphobos update
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|
607 else static if (! Have_MMFile) |
373489eeaf90
Applied downs' lphobos update
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parents:
diff
changeset
|
608 { |
373489eeaf90
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changeset
|
609 throw new FileException(filename, "MMFile unsupported"); |
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parents:
diff
changeset
|
610 } |
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Applied downs' lphobos update
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parents:
diff
changeset
|
611 else |
373489eeaf90
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parents:
diff
changeset
|
612 { |
373489eeaf90
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diff
changeset
|
613 static assert(0); |
373489eeaf90
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diff
changeset
|
614 } |
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parents:
diff
changeset
|
615 } |
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diff
changeset
|
616 } |
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parents:
diff
changeset
|
617 |
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|
618 unittest { |
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|
619 static if (Have_MMFile) |
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|
620 { |
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|
621 const size_t K = 1024; |
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|
622 size_t win = 64*K; // assume the page size is 64K |
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|
623 version(Win32) { |
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|
624 /+ these aren't defined in std.c.windows.windows so let's use the default |
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|
625 SYSTEM_INFO sysinfo; |
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|
626 GetSystemInfo(&sysinfo); |
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|
627 win = sysinfo.dwAllocationGranularity; |
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diff
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|
628 +/ |
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|
629 } else version (Unix) { |
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|
630 // getpagesize() is not defined in the unix D headers so use the guess |
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|
631 } |
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|
632 MmFile mf = new MmFile("testing.txt",MmFile.Mode.ReadWriteNew,100*K,null,win); |
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633 ubyte[] str = cast(ubyte[])"1234567890"; |
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|
634 ubyte[] data = cast(ubyte[])mf[0 .. 10]; |
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|
635 data[] = str[]; |
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|
636 assert( mf[0 .. 10] == str ); |
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|
637 data = cast(ubyte[])mf[50 .. 60]; |
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changeset
|
638 data[] = str[]; |
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diff
changeset
|
639 assert( mf[50 .. 60] == str ); |
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diff
changeset
|
640 ubyte[] data2 = cast(ubyte[])mf[20*K .. 60*K]; |
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parents:
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|
641 assert( data2.length == 40*K ); |
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changeset
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642 assert( data2[length-1] == 0 ); |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
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643 mf[100*K-1] = cast(ubyte)'b'; |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
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644 data2 = cast(ubyte[])mf[21*K .. 100*K]; |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
|
645 assert( data2.length == 79*K ); |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
|
646 assert( data2[length-1] == 'b' ); |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
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647 delete mf; |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
|
648 std.file.remove("testing.txt"); |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
|
649 } |
373489eeaf90
Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff
changeset
|
650 } |