Mercurial > projects > ldc
annotate lphobos/std/outbuffer.d @ 1134:152bd2c804d0
Update comments now that LLVM PR3861 has been fixed. However, since
conditionally removing the workaround makes the ABI dependent on LLVM version,
I reconsidered that.
(The same revision of LDC compiling for the same target should probably produce
code that follows the same ABI, right?)
author | Frits van Bommel <fvbommel wxs.nl> |
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date | Tue, 24 Mar 2009 02:46:57 +0100 |
parents | 88e23f8c2354 |
children |
rev | line source |
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473
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1 // outbuffer.d |
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2 |
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3 /** |
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4 * Boilerplate: |
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5 * $(std_boilerplate.html) |
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6 * Macros: |
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7 * WIKI = Phobos/StdOutbuffer |
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8 * Copyright: |
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9 * Copyright (c) 2001-2005 by Digital Mars |
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10 * All Rights Reserved |
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11 * www.digitalmars.com |
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12 */ |
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13 |
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14 |
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15 // Written by Walter Bright |
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16 |
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17 /* NOTE: This file has been patched from the original DMD distribution to |
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18 work with the GDC compiler. |
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19 |
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20 Modified by David Friedman, September 2004 |
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21 */ |
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22 |
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23 module std.outbuffer; |
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24 |
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25 private |
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26 { |
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27 import std.string; |
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28 import std.gc; |
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29 import std.c.stdio; |
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30 import std.c.stdlib; |
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31 import std.c.stdarg; |
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32 } |
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33 |
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34 /********************************************* |
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35 * OutBuffer provides a way to build up an array of bytes out |
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36 * of raw data. It is useful for things like preparing an |
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37 * array of bytes to write out to a file. |
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38 * OutBuffer's byte order is the format native to the computer. |
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39 * To control the byte order (endianness), use a class derived |
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40 * from OutBuffer. |
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41 */ |
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42 |
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43 class OutBuffer |
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44 { |
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45 ubyte data[]; |
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46 size_t offset; |
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47 |
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48 invariant |
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49 { |
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50 //printf("this = %p, offset = %x, data.length = %u\n", this, offset, data.length); |
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51 assert(offset <= data.length); |
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52 assert(data.length <= std.gc.capacity(data.ptr)); |
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53 } |
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54 |
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55 this() |
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56 { |
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57 //printf("in OutBuffer constructor\n"); |
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58 } |
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59 |
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60 /********************************* |
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61 * Convert to array of bytes. |
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62 */ |
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63 |
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64 ubyte[] toBytes() { return data[0 .. offset]; } |
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65 |
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66 /*********************************** |
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67 * Preallocate nbytes more to the size of the internal buffer. |
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68 * |
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69 * This is a |
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70 * speed optimization, a good guess at the maximum size of the resulting |
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71 * buffer will improve performance by eliminating reallocations and copying. |
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72 */ |
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73 |
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74 |
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75 void reserve(size_t nbytes) |
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76 in |
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77 { |
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78 assert(offset + nbytes >= offset); |
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79 } |
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80 out |
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81 { |
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82 assert(offset + nbytes <= data.length); |
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83 assert(data.length <= std.gc.capacity(data.ptr)); |
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84 } |
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85 body |
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86 { |
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87 if (data.length < offset + nbytes) |
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88 { |
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89 //std.c.stdio.printf("OutBuffer.reserve: ptr = %p, length = %d, offset = %d, nbytes = %d, capacity = %d\n", data.ptr, data.length, offset, nbytes, std.gc.capacity(data.ptr)); |
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90 data.length = (offset + nbytes) * 2; |
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91 //std.c.stdio.printf("OutBuffer.reserve: ptr = %p, length = %d, capacity = %d\n", data.ptr, data.length, std.gc.capacity(data.ptr)); |
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92 std.gc.hasPointers(data.ptr); |
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93 } |
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94 } |
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95 |
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96 /************************************* |
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97 * Append data to the internal buffer. |
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98 */ |
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99 |
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100 void write(ubyte[] bytes) |
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101 { |
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102 reserve(bytes.length); |
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103 data[offset .. offset + bytes.length] = bytes; |
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104 offset += bytes.length; |
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105 } |
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106 |
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107 void write(ubyte b) /// ditto |
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108 { |
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109 reserve(ubyte.sizeof); |
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110 this.data[offset] = b; |
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111 offset += ubyte.sizeof; |
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112 } |
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113 |
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114 void write(byte b) { write(cast(ubyte)b); } /// ditto |
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115 void write(char c) { write(cast(ubyte)c); } /// ditto |
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116 |
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117 void write(ushort w) /// ditto |
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118 { |
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119 reserve(ushort.sizeof); |
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120 *cast(ushort *)&data[offset] = w; |
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121 offset += ushort.sizeof; |
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122 } |
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123 |
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124 void write(short s) { write(cast(ushort)s); } /// ditto |
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125 |
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126 void write(wchar c) /// ditto |
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127 { |
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128 reserve(wchar.sizeof); |
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129 *cast(wchar *)&data[offset] = c; |
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130 offset += wchar.sizeof; |
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131 } |
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132 |
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133 void write(uint w) /// ditto |
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134 { |
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135 reserve(uint.sizeof); |
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136 *cast(uint *)&data[offset] = w; |
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137 offset += uint.sizeof; |
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138 } |
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139 |
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140 void write(int i) { write(cast(uint)i); } /// ditto |
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141 |
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142 void write(ulong l) /// ditto |
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143 { |
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144 reserve(ulong.sizeof); |
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145 *cast(ulong *)&data[offset] = l; |
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146 offset += ulong.sizeof; |
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147 } |
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148 |
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149 void write(long l) { write(cast(ulong)l); } /// ditto |
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150 |
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151 void write(float f) /// ditto |
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152 { |
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153 reserve(float.sizeof); |
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154 *cast(float *)&data[offset] = f; |
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155 offset += float.sizeof; |
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156 } |
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157 |
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158 void write(double f) /// ditto |
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159 { |
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160 reserve(double.sizeof); |
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161 *cast(double *)&data[offset] = f; |
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162 offset += double.sizeof; |
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163 } |
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164 |
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165 void write(real f) /// ditto |
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166 { |
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167 reserve(real.sizeof); |
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168 *cast(real *)&data[offset] = f; |
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169 offset += real.sizeof; |
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170 } |
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171 |
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172 void write(char[] s) /// ditto |
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173 { |
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174 write(cast(ubyte[])s); |
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175 } |
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176 |
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177 void write(OutBuffer buf) /// ditto |
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178 { |
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179 write(buf.toBytes()); |
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180 } |
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181 |
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182 /**************************************** |
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183 * Append nbytes of 0 to the internal buffer. |
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184 */ |
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185 |
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186 void fill0(uint nbytes) |
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187 { |
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188 reserve(nbytes); |
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189 data[offset .. offset + nbytes] = 0; |
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190 offset += nbytes; |
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191 } |
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192 |
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193 /********************************** |
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194 * 0-fill to align on power of 2 boundary. |
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195 */ |
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196 |
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197 void alignSize(size_t alignsize) |
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198 in |
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199 { |
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200 assert(alignsize && (alignsize & (alignsize - 1)) == 0); |
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201 } |
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202 out |
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203 { |
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204 assert((offset & (alignsize - 1)) == 0); |
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205 } |
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206 body |
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207 { size_t nbytes; |
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208 |
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209 nbytes = offset & (alignsize - 1); |
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210 if (nbytes) |
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211 fill0(alignsize - nbytes); |
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212 } |
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213 |
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214 /**************************************** |
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215 * Optimize common special case alignSize(2) |
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216 */ |
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217 |
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218 void align2() |
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219 { |
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220 if (offset & 1) |
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221 write(cast(byte)0); |
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222 } |
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223 |
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224 /**************************************** |
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225 * Optimize common special case alignSize(4) |
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226 */ |
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227 |
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228 void align4() |
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229 { |
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230 if (offset & 3) |
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231 { size_t nbytes = (4 - offset) & 3; |
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232 fill0(nbytes); |
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233 } |
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234 } |
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235 |
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236 /************************************** |
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237 * Convert internal buffer to array of chars. |
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238 */ |
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239 |
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240 char[] toString() |
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241 { |
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242 //printf("OutBuffer.toString()\n"); |
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243 return cast(char[])data[0 .. offset]; |
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244 } |
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245 |
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246 /***************************************** |
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247 * Append output of C's vprintf() to internal buffer. |
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248 */ |
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249 |
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250 void vprintf(char[] format, va_list args) |
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251 { |
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252 char[128] buffer; |
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253 char* p; |
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254 char* f; |
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255 uint psize; |
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256 int count; |
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257 va_list args_copy; |
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258 |
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259 f = toStringz(format); |
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260 p = buffer.ptr; |
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261 psize = buffer.length; |
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262 for (;;) |
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263 { |
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264 va_copy(args_copy, args); |
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265 version(Win32) |
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266 { |
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267 count = _vsnprintf(p,psize,f,args_copy); |
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268 if (count != -1) |
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269 break; |
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270 psize *= 2; |
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271 p = cast(char *) /*alloca*/malloc(psize); // buffer too small, try again with larger size |
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272 } |
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273 else version(GNU) { |
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274 count = vsnprintf(p,psize,f,args_copy); |
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275 if (count == -1) |
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276 psize *= 2; |
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277 else if (count >= psize) |
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278 psize = count + 1; |
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279 else |
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280 break; |
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281 p = cast(char *) /*alloca*/std.gc.malloc(psize); // buffer too small, try again with larger size |
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282 } |
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283 else version(linux) |
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284 { |
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285 count = vsnprintf(p,psize,f,args_copy); |
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286 if (count == -1) |
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287 psize *= 2; |
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288 else if (count >= psize) |
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289 psize = count + 1; |
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290 else |
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291 break; |
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292 /+ |
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293 if (p != buffer) |
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294 c.stdlib.free(p); |
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295 p = (char *) c.stdlib.malloc(psize); // buffer too small, try again with larger size |
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296 +/ |
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297 p = cast(char *) /*alloca*/std.gc.malloc(psize); // buffer too small, try again with larger size |
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298 } |
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299 } |
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300 write(p[0 .. count]); |
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301 /+ |
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302 version (linux) |
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303 { |
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304 if (p != buffer) |
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305 c.stdlib.free(p); |
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306 } |
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307 +/ |
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308 } |
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309 |
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310 /***************************************** |
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311 * Append output of C's printf() to internal buffer. |
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312 */ |
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313 |
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314 void printf(char[] format, ...) |
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315 { |
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316 version (GNU) |
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317 { |
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318 vprintf(format, _argptr); |
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319 } |
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320 else |
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321 { |
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322 va_list ap; |
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323 ap = cast(va_list)&format; |
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324 ap += format.sizeof; |
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325 vprintf(format, ap); |
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326 } |
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327 } |
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328 |
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329 /***************************************** |
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330 * At offset index into buffer, create nbytes of space by shifting upwards |
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331 * all data past index. |
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332 */ |
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333 |
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334 void spread(size_t index, size_t nbytes) |
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335 in |
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336 { |
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337 assert(index <= offset); |
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338 } |
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339 body |
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340 { |
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341 reserve(nbytes); |
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342 |
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343 // This is an overlapping copy - should use memmove() |
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344 for (size_t i = offset; i > index; ) |
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345 { |
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346 --i; |
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347 data[i + nbytes] = data[i]; |
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348 } |
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349 offset += nbytes; |
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350 } |
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351 } |
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352 |
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353 unittest |
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354 { |
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355 //printf("Starting OutBuffer test\n"); |
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356 |
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357 OutBuffer buf = new OutBuffer(); |
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358 |
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359 //printf("buf = %p\n", buf); |
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360 //printf("buf.offset = %x\n", buf.offset); |
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361 assert(buf.offset == 0); |
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362 buf.write("hello"); |
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363 buf.write(cast(byte)0x20); |
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364 buf.write("world"); |
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365 buf.printf(" %d", 6); |
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366 //printf("buf = '%.*s'\n", buf.toString()); |
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367 assert(cmp(buf.toString(), "hello world 6") == 0); |
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368 } |