prosody
25260c20c5a4
util/dbuffer.lua

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util/dbuffer.lua @ 11339:25260c20c5a4

doap: Move comment into <implements> it comments on
author Kim Alvefur <zash@zash.se>
date Fri, 29 Jan 2021 23:14:48 +0100
parent 11196:f243836c449a
child 11636:11e0a0a08da3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 local queue = require "util.queue";
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2
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3 local s_byte, s_sub = string.byte, string.sub;
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4 local dbuffer_methods = {};
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5 local dynamic_buffer_mt = { __name = "dbuffer", __index = dbuffer_methods };
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6
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7 function dbuffer_methods:write(data)
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8 if self.max_size and #data + self._length > self.max_size then
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9 return nil;
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10 end
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11 local ok = self.items:push(data);
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12 if not ok then
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13 self:collapse();
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14 ok = self.items:push(data);
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15 end
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16 if not ok then
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17 return nil;
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18 end
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19 self._length = self._length + #data;
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20 return true;
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21 end
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22
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23 function dbuffer_methods:read_chunk(requested_bytes)
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24 local chunk, consumed = self.items:peek(), self.front_consumed;
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25 if not chunk then return; end
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26 local chunk_length = #chunk;
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27 local remaining_chunk_length = chunk_length - consumed;
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28 if not requested_bytes then
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29 requested_bytes = remaining_chunk_length;
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30 end
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31 if remaining_chunk_length <= requested_bytes then
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32 self.front_consumed = 0;
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33 self._length = self._length - remaining_chunk_length;
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34 self.items:pop();
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35 assert(#chunk:sub(consumed + 1, -1) == remaining_chunk_length);
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36 return chunk:sub(consumed + 1, -1), remaining_chunk_length;
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37 end
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38 local end_pos = consumed + requested_bytes;
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39 self.front_consumed = end_pos;
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40 self._length = self._length - requested_bytes;
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41 assert(#chunk:sub(consumed + 1, end_pos) == requested_bytes);
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42 return chunk:sub(consumed + 1, end_pos), requested_bytes;
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43 end
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44
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45 function dbuffer_methods:read(requested_bytes)
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46 local chunks;
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47
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48 if requested_bytes and requested_bytes > self._length then
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49 return nil;
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50 end
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51
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52 local chunk, read_bytes = self:read_chunk(requested_bytes);
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53 if not requested_bytes then
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54 return chunk;
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55 elseif chunk then
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56 requested_bytes = requested_bytes - read_bytes;
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57 if requested_bytes == 0 then -- Already read everything we need
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58 return chunk;
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59 end
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60 chunks = {};
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61 else
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62 return nil;
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63 end
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64
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65 -- Need to keep reading more chunks
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66 while chunk do
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67 table.insert(chunks, chunk);
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68 if requested_bytes > 0 then
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69 chunk, read_bytes = self:read_chunk(requested_bytes);
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70 requested_bytes = requested_bytes - read_bytes;
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71 else
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72 break;
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73 end
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74 end
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75
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76 return table.concat(chunks);
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77 end
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78
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79 function dbuffer_methods:discard(requested_bytes)
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80 if requested_bytes > self._length then
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81 return nil;
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82 end
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83
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84 local chunk, read_bytes = self:read_chunk(requested_bytes);
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85 if chunk then
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86 requested_bytes = requested_bytes - read_bytes;
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87 if requested_bytes == 0 then -- Already read everything we need
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88 return true;
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89 end
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90 else
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91 return nil;
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92 end
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93
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94 while chunk do
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95 if requested_bytes > 0 then
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96 chunk, read_bytes = self:read_chunk(requested_bytes);
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97 requested_bytes = requested_bytes - read_bytes;
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98 else
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99 break;
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100 end
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101 end
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102 return true;
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103 end
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104
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105 -- Normalize i, j into absolute offsets within the
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106 -- front chunk (accounting for front_consumed), and
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107 -- ensure there is enough data in the first chunk
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108 -- to cover any subsequent :sub() or :byte() operation
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109 function dbuffer_methods:_prep_sub(i, j)
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110 if j == nil then
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111 j = -1;
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112 end
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113 if j < 0 then
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114 j = self._length + (j+1);
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115 end
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116 if i < 0 then
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117 i = self._length + (i+1);
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118 end
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119 if i < 1 then
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120 i = 1;
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121 end
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122 if j > self._length then
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123 j = self._length;
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124 end
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125 if i > j then
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126 return nil;
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127 end
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128
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129 self:collapse(j);
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130
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131 if self.front_consumed > 0 then
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132 i = i + self.front_consumed;
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133 j = j + self.front_consumed;
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134 end
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135
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136 return i, j;
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137 end
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138
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139 function dbuffer_methods:sub(i, j)
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140 i, j = self:_prep_sub(i, j);
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141 if not i then
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142 return "";
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143 end
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144 return s_sub(self.items:peek(), i, j);
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145 end
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146
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147 function dbuffer_methods:byte(i, j)
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148 i = i or 1;
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149 j = j or i;
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150 i, j = self:_prep_sub(i, j);
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151 if not i then
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152 return;
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153 end
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154 return s_byte(self.items:peek(), i, j);
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155 end
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156
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157 function dbuffer_methods:length()
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158 return self._length;
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159 end
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160 dbuffer_methods.len = dbuffer_methods.length; -- strings have :len()
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161 dynamic_buffer_mt.__len = dbuffer_methods.length; -- support # operator
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162
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163 function dbuffer_methods:collapse(bytes)
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164 bytes = bytes or self._length;
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165
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166 local front_chunk = self.items:peek();
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167
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168 if not front_chunk or #front_chunk - self.front_consumed >= bytes then
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169 return;
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170 end
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171
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172 local front_chunks = { front_chunk:sub(self.front_consumed+1) };
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173 local front_bytes = #front_chunks[1];
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174
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175 while front_bytes < bytes do
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176 self.items:pop();
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177 local chunk = self.items:peek();
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178 front_bytes = front_bytes + #chunk;
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179 table.insert(front_chunks, chunk);
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180 end
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181 self.items:replace(table.concat(front_chunks));
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182 self.front_consumed = 0;
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183 end
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184
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185 local function new(max_size, max_chunks)
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186 if max_size and max_size <= 0 then
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187 return nil;
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188 end
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189 return setmetatable({
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190 front_consumed = 0;
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191 _length = 0;
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192 max_size = max_size;
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193 items = queue.new(max_chunks or 32);
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194 }, dynamic_buffer_mt);
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195 end
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196
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197 return {
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198 new = new;
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199 };