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1 -----------------------------------------------------------------------------
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2 -- GNAT COMPILER COMPONENTS --
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3 -- --
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4 -- G N A T . R E W R I T E _ D A T A --
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5 -- --
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6 -- B o d y --
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7 -- --
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8 -- Copyright (C) 2014-2017, Free Software Foundation, Inc. --
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9 -- --
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10 -- GNAT is free software; you can redistribute it and/or modify it under --
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11 -- terms of the GNU General Public License as published by the Free Soft- --
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12 -- ware Foundation; either version 3, or (at your option) any later ver- --
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13 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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14 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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15 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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16 -- --
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17 -- As a special exception under Section 7 of GPL version 3, you are granted --
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18 -- additional permissions described in the GCC Runtime Library Exception, --
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19 -- version 3.1, as published by the Free Software Foundation. --
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20 -- --
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21 -- You should have received a copy of the GNU General Public License and --
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22 -- a copy of the GCC Runtime Library Exception along with this program; --
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23 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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24 -- <http://www.gnu.org/licenses/>. --
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25 -- --
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26 -- GNAT was originally developed by the GNAT team at New York University. --
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27 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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28 -- --
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29 ------------------------------------------------------------------------------
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30
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31 with Ada.Unchecked_Conversion;
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32
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33 package body GNAT.Rewrite_Data is
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34
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35 use Ada;
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36
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37 subtype SEO is Stream_Element_Offset;
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38
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39 procedure Do_Output
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40 (B : in out Buffer;
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41 Data : Stream_Element_Array;
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42 Output : not null access procedure (Data : Stream_Element_Array));
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43 -- Do the actual output. This ensures that we properly send the data
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44 -- through linked rewrite buffers if any.
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45
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46 ------------
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47 -- Create --
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48 ------------
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49
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50 function Create
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51 (Pattern, Value : String;
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52 Size : Stream_Element_Offset := 1_024) return Buffer
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53 is
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54
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55 subtype SP is String (1 .. Pattern'Length);
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56 subtype SEAP is Stream_Element_Array (1 .. Pattern'Length);
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57
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58 subtype SV is String (1 .. Value'Length);
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59 subtype SEAV is Stream_Element_Array (1 .. Value'Length);
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60
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61 function To_SEAP is new Unchecked_Conversion (SP, SEAP);
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62 function To_SEAV is new Unchecked_Conversion (SV, SEAV);
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63
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64 begin
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65 -- Return result (can't be smaller than pattern)
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66
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67 return B : Buffer
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68 (SEO'Max (Size, SEO (Pattern'Length)),
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69 SEO (Pattern'Length),
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70 SEO (Value'Length))
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71 do
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72 B.Pattern := To_SEAP (Pattern);
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73 B.Value := To_SEAV (Value);
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74 B.Pos_C := 0;
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75 B.Pos_B := 0;
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76 end return;
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77 end Create;
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78
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79 ---------------
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80 -- Do_Output --
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81 ---------------
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82
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83 procedure Do_Output
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84 (B : in out Buffer;
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85 Data : Stream_Element_Array;
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86 Output : not null access procedure (Data : Stream_Element_Array))
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87 is
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88 begin
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89 if B.Next = null then
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90 Output (Data);
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91 else
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92 Write (B.Next.all, Data, Output);
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93 end if;
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94 end Do_Output;
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95
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96 -----------
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97 -- Flush --
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98 -----------
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99
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100 procedure Flush
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101 (B : in out Buffer;
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102 Output : not null access procedure (Data : Stream_Element_Array))
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103 is
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104 begin
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105 -- Flush output buffer
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106
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107 if B.Pos_B > 0 then
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108 Do_Output (B, B.Buffer (1 .. B.Pos_B), Output);
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109 end if;
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110
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111 -- Flush current buffer
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112
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113 if B.Pos_C > 0 then
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114 Do_Output (B, B.Current (1 .. B.Pos_C), Output);
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115 end if;
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116
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117 -- Flush linked buffer if any
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118
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119 if B.Next /= null then
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120 Flush (B.Next.all, Output);
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121 end if;
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122
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123 Reset (B);
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124 end Flush;
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125
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126 ----------
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127 -- Link --
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128 ----------
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129
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130 procedure Link (From : in out Buffer; To : Buffer_Ref) is
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131 begin
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132 From.Next := To;
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133 end Link;
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134
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135 -----------
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136 -- Reset --
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137 -----------
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138
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139 procedure Reset (B : in out Buffer) is
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140 begin
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141 B.Pos_B := 0;
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142 B.Pos_C := 0;
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143
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144 if B.Next /= null then
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145 Reset (B.Next.all);
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146 end if;
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147 end Reset;
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148
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149 -------------
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150 -- Rewrite --
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151 -------------
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152
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153 procedure Rewrite
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154 (B : in out Buffer;
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155 Input : not null access procedure
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156 (Buffer : out Stream_Element_Array;
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157 Last : out Stream_Element_Offset);
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158 Output : not null access procedure (Data : Stream_Element_Array))
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159 is
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160 Buffer : Stream_Element_Array (1 .. B.Size);
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161 Last : Stream_Element_Offset;
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162
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163 begin
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164 Rewrite_All : loop
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165 Input (Buffer, Last);
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166 exit Rewrite_All when Last = 0;
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167 Write (B, Buffer (1 .. Last), Output);
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168 end loop Rewrite_All;
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169
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170 Flush (B, Output);
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171 end Rewrite;
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172
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173 ----------
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174 -- Size --
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175 ----------
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176
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177 function Size (B : Buffer) return Natural is
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178 begin
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179 return Natural (B.Pos_B + B.Pos_C);
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180 end Size;
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181
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182 -----------
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183 -- Write --
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184 -----------
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185
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186 procedure Write
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187 (B : in out Buffer;
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188 Data : Stream_Element_Array;
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189 Output : not null access procedure (Data : Stream_Element_Array))
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190 is
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191 procedure Need_Space (Size : Stream_Element_Offset);
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192 pragma Inline (Need_Space);
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193
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194 ----------------
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195 -- Need_Space --
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196 ----------------
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197
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198 procedure Need_Space (Size : Stream_Element_Offset) is
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199 begin
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200 if B.Pos_B + Size > B.Size then
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201 Do_Output (B, B.Buffer (1 .. B.Pos_B), Output);
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202 B.Pos_B := 0;
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203 end if;
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204 end Need_Space;
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205
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206 -- Start of processing for Write
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207
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208 begin
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209 if B.Size_Pattern = 0 then
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210 Do_Output (B, Data, Output);
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211
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212 else
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213 for K in Data'Range loop
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214 if Data (K) = B.Pattern (B.Pos_C + 1) then
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215
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216 -- Store possible start of a match
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217
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218 B.Pos_C := B.Pos_C + 1;
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219 B.Current (B.Pos_C) := Data (K);
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220
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221 else
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222 -- Not part of pattern, if a start of a match was found,
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223 -- remove it.
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224
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225 if B.Pos_C /= 0 then
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226 Need_Space (B.Pos_C);
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227
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228 B.Buffer (B.Pos_B + 1 .. B.Pos_B + B.Pos_C) :=
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229 B.Current (1 .. B.Pos_C);
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230 B.Pos_B := B.Pos_B + B.Pos_C;
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231 B.Pos_C := 0;
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232 end if;
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233
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234 Need_Space (1);
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235 B.Pos_B := B.Pos_B + 1;
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236 B.Buffer (B.Pos_B) := Data (K);
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237 end if;
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238
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239 if B.Pos_C = B.Size_Pattern then
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240
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241 -- The pattern is found
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242
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243 Need_Space (B.Size_Value);
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244
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245 B.Buffer (B.Pos_B + 1 .. B.Pos_B + B.Size_Value) := B.Value;
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246 B.Pos_C := 0;
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247 B.Pos_B := B.Pos_B + B.Size_Value;
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248 end if;
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249 end loop;
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250 end if;
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251 end Write;
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252
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253 end GNAT.Rewrite_Data;
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