prosody
d7a403060946
util/dbuffer.lua

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util/dbuffer.lua @ 11028:d7a403060946

util.dbuffer: Fix traceback when :collapse() is called on empty buffer
author Matthew Wild <mwild1@gmail.com>
date Thu, 20 Aug 2020 15:22:19 +0100
parent 10980:eaee72c7afbd
child 11045:8c6bace13229
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rev   line source
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1 local queue = require "util.queue";
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2
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3 local dbuffer_methods = {};
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4 local dynamic_buffer_mt = { __index = dbuffer_methods };
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5
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6 function dbuffer_methods:write(data)
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7 if self.max_size and #data + self._length > self.max_size then
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8 return nil;
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9 end
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10 local ok = self.items:push(data);
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11 if not ok then
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12 self:collapse();
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13 ok = self.items:push(data);
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14 end
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15 if not ok then
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16 return nil;
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17 end
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18 self._length = self._length + #data;
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19 return true;
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20 end
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21
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22 function dbuffer_methods:read_chunk(requested_bytes)
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23 local chunk, consumed = self.items:peek(), self.front_consumed;
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24 if not chunk then return; end
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25 local chunk_length = #chunk;
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26 local remaining_chunk_length = chunk_length - consumed;
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27 if not requested_bytes then
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28 requested_bytes = remaining_chunk_length;
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29 end
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30 if remaining_chunk_length <= requested_bytes then
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31 self.front_consumed = 0;
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32 self._length = self._length - remaining_chunk_length;
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33 self.items:pop();
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34 assert(#chunk:sub(consumed + 1, -1) == remaining_chunk_length);
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35 return chunk:sub(consumed + 1, -1), remaining_chunk_length;
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36 end
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37 local end_pos = consumed + requested_bytes;
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38 self.front_consumed = end_pos;
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39 self._length = self._length - requested_bytes;
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40 assert(#chunk:sub(consumed + 1, end_pos) == requested_bytes);
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41 return chunk:sub(consumed + 1, end_pos), requested_bytes;
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42 end
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43
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44 function dbuffer_methods:read(requested_bytes)
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45 local chunks;
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46
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47 if requested_bytes and requested_bytes > self._length then
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48 return nil;
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49 end
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50
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51 local chunk, read_bytes = self:read_chunk(requested_bytes);
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52 if not requested_bytes then
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53 return chunk;
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54 elseif chunk then
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55 requested_bytes = requested_bytes - read_bytes;
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56 if requested_bytes == 0 then -- Already read everything we need
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57 return chunk;
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58 end
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59 chunks = {};
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60 else
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61 return nil;
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62 end
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63
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64 -- Need to keep reading more chunks
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65 while chunk do
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66 table.insert(chunks, chunk);
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67 if requested_bytes > 0 then
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68 chunk, read_bytes = self:read_chunk(requested_bytes);
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69 requested_bytes = requested_bytes - read_bytes;
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70 else
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71 break;
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72 end
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73 end
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74
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75 return table.concat(chunks);
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76 end
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77
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78 function dbuffer_methods:discard(requested_bytes)
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79 if requested_bytes > self._length then
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80 return nil;
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81 end
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82
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83 local chunk, read_bytes = self:read_chunk(requested_bytes);
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84 if chunk then
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85 requested_bytes = requested_bytes - read_bytes;
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86 if requested_bytes == 0 then -- Already read everything we need
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87 return true;
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88 end
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89 else
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90 return nil;
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91 end
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92
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93 while chunk do
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94 if requested_bytes > 0 then
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95 chunk, read_bytes = self:read_chunk(requested_bytes);
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96 requested_bytes = requested_bytes - read_bytes;
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97 else
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98 break;
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99 end
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100 end
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101 return true;
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102 end
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103
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104 function dbuffer_methods:sub(i, j)
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105 if j == nil then
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106 j = -1;
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107 end
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108 if j < 0 then
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109 j = self._length + (j+1);
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110 end
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111 if i < 0 then
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112 i = self._length + (i+1);
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113 end
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114 if i < 1 then
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115 i = 1;
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116 end
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117 if j > self._length then
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118 j = self._length;
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119 end
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120 if i > j then
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121 return "";
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122 end
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123
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124 self:collapse(j);
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125
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126 return self.items:peek():sub(i, j);
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127 end
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128
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129 function dbuffer_methods:byte(i, j)
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130 i = i or 1;
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131 j = j or i;
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132 return string.byte(self:sub(i, j), 1, -1);
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133 end
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134
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135 function dbuffer_methods:length()
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136 return self._length;
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137 end
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138 dynamic_buffer_mt.__len = dbuffer_methods.length; -- support # operator
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139
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140 function dbuffer_methods:collapse(bytes)
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141 bytes = bytes or self._length;
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142
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143 local front_chunk = self.items:peek();
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144
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145 if not front_chunk or #front_chunk - self.front_consumed >= bytes then
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146 return;
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147 end
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148
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149 local front_chunks = { front_chunk:sub(self.front_consumed+1) };
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150 local front_bytes = #front_chunks[1];
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151
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152 while front_bytes < bytes do
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153 self.items:pop();
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154 local chunk = self.items:peek();
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155 front_bytes = front_bytes + #chunk;
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156 table.insert(front_chunks, chunk);
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157 end
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158 self.items:replace(table.concat(front_chunks));
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159 self.front_consumed = 0;
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160 end
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161
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162 local function new(max_size, max_chunks)
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163 if max_size and max_size <= 0 then
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164 return nil;
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165 end
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166 return setmetatable({
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167 front_consumed = 0;
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168 _length = 0;
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169 max_size = max_size;
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170 items = queue.new(max_chunks or 32);
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171 }, dynamic_buffer_mt);
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172 end
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173
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174 return {
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175 new = new;
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176 };