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annotate lphobos/std/outbuffer.d @ 1137:45d73f0a9b43

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Automated merge with http://hg.dsource.org/projects/ldc
author Christian Kamm <kamm incasoftware de>
date Tue, 24 Mar 2009 14:34:16 +0100
parents 88e23f8c2354
children
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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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parents:
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147 }
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diff changeset
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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diff changeset
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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diff changeset
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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diff changeset
190 offset += nbytes;
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parents:
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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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parents:
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201 }
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parents:
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202 out
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203 {
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parents:
diff changeset
204 assert((offset & (alignsize - 1)) == 0);
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parents:
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205 }
373489eeaf90 Applied downs' lphobos update
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diff changeset
206 body
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diff changeset
207 { size_t nbytes;
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parents:
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208
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209 nbytes = offset & (alignsize - 1);
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diff changeset
210 if (nbytes)
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211 fill0(alignsize - nbytes);
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parents:
diff changeset
212 }
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parents:
diff changeset
213
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diff changeset
214 /****************************************
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diff changeset
215 * Optimize common special case alignSize(2)
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parents:
diff changeset
216 */
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parents:
diff changeset
217
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diff changeset
218 void align2()
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parents:
diff changeset
219 {
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parents:
diff changeset
220 if (offset & 1)
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parents:
diff changeset
221 write(cast(byte)0);
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parents:
diff changeset
222 }
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parents:
diff changeset
223
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diff changeset
224 /****************************************
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parents:
diff changeset
225 * Optimize common special case alignSize(4)
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parents:
diff changeset
226 */
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diff changeset
227
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diff changeset
228 void align4()
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parents:
diff changeset
229 {
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parents:
diff changeset
230 if (offset & 3)
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parents:
diff changeset
231 { size_t nbytes = (4 - offset) & 3;
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parents:
diff changeset
232 fill0(nbytes);
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parents:
diff changeset
233 }
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parents:
diff changeset
234 }
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
235
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parents:
diff changeset
236 /**************************************
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
237 * Convert internal buffer to array of chars.
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
238 */
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
239
373489eeaf90 Applied downs' lphobos update
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diff changeset
240 char[] toString()
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
241 {
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
242 //printf("OutBuffer.toString()\n");
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
243 return cast(char[])data[0 .. offset];
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parents:
diff changeset
244 }
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
245
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parents:
diff changeset
246 /*****************************************
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parents:
diff changeset
247 * Append output of C's vprintf() to internal buffer.
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parents:
diff changeset
248 */
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parents:
diff changeset
249
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parents:
diff changeset
250 void vprintf(char[] format, va_list args)
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parents:
diff changeset
251 {
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
252 char[128] buffer;
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diff changeset
253 char* p;
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
254 char* f;
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
255 uint psize;
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
256 int count;
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
257 va_list args_copy;
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parents:
diff changeset
258
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parents:
diff changeset
259 f = toStringz(format);
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diff changeset
260 p = buffer.ptr;
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parents:
diff changeset
261 psize = buffer.length;
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parents:
diff changeset
262 for (;;)
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
263 {
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
264 va_copy(args_copy, args);
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
265 version(Win32)
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
266 {
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
267 count = _vsnprintf(p,psize,f,args_copy);
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parents:
diff changeset
268 if (count != -1)
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
269 break;
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
270 psize *= 2;
662
88e23f8c2354 Applied downs' latest Phobos patch
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents: 473
diff changeset
271 p = cast(char *) /*alloca*/malloc(psize); // buffer too small, try again with larger size
473
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
272 }
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
273 else version(GNU) {
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parents:
diff changeset
274 count = vsnprintf(p,psize,f,args_copy);
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parents:
diff changeset
275 if (count == -1)
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
276 psize *= 2;
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
277 else if (count >= psize)
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
278 psize = count + 1;
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
279 else
373489eeaf90 Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
280 break;
662
88e23f8c2354 Applied downs' latest Phobos patch
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents: 473
diff changeset
281 p = cast(char *) /*alloca*/std.gc.malloc(psize); // buffer too small, try again with larger size
473
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
282 }
373489eeaf90 Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
283 else version(linux)
373489eeaf90 Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
284 {
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
285 count = vsnprintf(p,psize,f,args_copy);
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
286 if (count == -1)
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
287 psize *= 2;
373489eeaf90 Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
288 else if (count >= psize)
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
289 psize = count + 1;
373489eeaf90 Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
290 else
373489eeaf90 Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
291 break;
373489eeaf90 Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
292 /+
373489eeaf90 Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
293 if (p != buffer)
373489eeaf90 Applied downs' lphobos update
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
diff changeset
294 c.stdlib.free(p);
373489eeaf90 Applied downs' lphobos update
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parents:
diff changeset
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
473
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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 }