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Rev | Author | Line No. | Line |
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7983 | leency | 1 | (* |
7597 | akron1 | 2 | BSD 2-Clause License |
3 | |||
7983 | leency | 4 | Copyright (c) 2018-2020, Anton Krotov |
7597 | akron1 | 5 | All rights reserved. |
6 | *) |
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7 | |||
8 | MODULE FILES; |
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9 | |||
10 | IMPORT UTILS, C := COLLECTIONS, CONSOLE; |
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11 | |||
12 | |||
13 | TYPE |
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14 | |||
15 | FILE* = POINTER TO RECORD (C.ITEM) |
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16 | |||
17 | ptr: INTEGER; |
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18 | |||
19 | buffer: ARRAY 64*1024 OF BYTE; |
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8097 | maxcodehac | 20 | count: INTEGER |
7597 | akron1 | 21 | |
22 | END; |
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23 | |||
24 | VAR |
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25 | |||
26 | files: C.COLLECTION; |
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27 | |||
28 | |||
29 | PROCEDURE copy (src: ARRAY OF BYTE; src_idx: INTEGER; VAR dst: ARRAY OF BYTE; dst_idx: INTEGER; bytes: INTEGER); |
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30 | BEGIN |
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31 | WHILE bytes > 0 DO |
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32 | dst[dst_idx] := src[src_idx]; |
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33 | INC(dst_idx); |
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34 | INC(src_idx); |
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35 | DEC(bytes) |
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36 | END |
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37 | END copy; |
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38 | |||
39 | |||
40 | PROCEDURE flush (file: FILE): INTEGER; |
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41 | VAR |
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42 | res: INTEGER; |
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43 | |||
44 | BEGIN |
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45 | IF file # NIL THEN |
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46 | res := UTILS.FileWrite(file.ptr, file.buffer, file.count); |
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47 | IF res < 0 THEN |
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48 | res := 0 |
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49 | END |
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50 | ELSE |
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51 | res := 0 |
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52 | END |
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53 | |||
54 | RETURN res |
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55 | END flush; |
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56 | |||
57 | |||
58 | PROCEDURE NewFile (): FILE; |
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59 | VAR |
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60 | file: FILE; |
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61 | citem: C.ITEM; |
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62 | |||
63 | BEGIN |
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64 | citem := C.pop(files); |
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65 | IF citem = NIL THEN |
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66 | NEW(file) |
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67 | ELSE |
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68 | file := citem(FILE) |
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69 | END |
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70 | |||
71 | RETURN file |
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72 | END NewFile; |
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73 | |||
74 | |||
75 | PROCEDURE create* (name: ARRAY OF CHAR): FILE; |
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76 | VAR |
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77 | file: FILE; |
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78 | ptr: INTEGER; |
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79 | |||
80 | BEGIN |
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81 | ptr := UTILS.FileCreate(name); |
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82 | |||
83 | IF ptr > 0 THEN |
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84 | file := NewFile(); |
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85 | file.ptr := ptr; |
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8097 | maxcodehac | 86 | file.count := 0 |
7597 | akron1 | 87 | ELSE |
88 | file := NIL |
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89 | END |
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90 | |||
91 | RETURN file |
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92 | END create; |
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93 | |||
94 | |||
95 | PROCEDURE open* (name: ARRAY OF CHAR): FILE; |
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96 | VAR |
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97 | file: FILE; |
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98 | ptr: INTEGER; |
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99 | |||
100 | BEGIN |
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101 | ptr := UTILS.FileOpen(name); |
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102 | |||
103 | IF ptr > 0 THEN |
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104 | file := NewFile(); |
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105 | file.ptr := ptr; |
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106 | file.count := -1 |
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107 | ELSE |
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108 | file := NIL |
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109 | END |
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110 | |||
111 | RETURN file |
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112 | END open; |
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113 | |||
114 | |||
115 | PROCEDURE close* (VAR file: FILE); |
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116 | VAR |
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117 | n: INTEGER; |
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118 | |||
119 | BEGIN |
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120 | IF file # NIL THEN |
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121 | |||
122 | IF file.count > 0 THEN |
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123 | n := flush(file) |
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124 | END; |
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125 | |||
126 | file.count := -1; |
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127 | |||
128 | UTILS.FileClose(file.ptr); |
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129 | file.ptr := 0; |
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130 | |||
131 | C.push(files, file); |
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132 | file := NIL |
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133 | END |
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134 | END close; |
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135 | |||
136 | |||
7696 | akron1 | 137 | PROCEDURE read* (file: FILE; VAR chunk: ARRAY OF CHAR; bytes: INTEGER): INTEGER; |
7597 | akron1 | 138 | VAR |
139 | res: INTEGER; |
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140 | |||
141 | BEGIN |
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142 | IF file # NIL THEN |
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143 | res := UTILS.FileRead(file.ptr, chunk, MAX(MIN(bytes, LEN(chunk)), 0)); |
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144 | IF res < 0 THEN |
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145 | res := 0 |
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146 | END |
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147 | ELSE |
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148 | res := 0 |
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149 | END |
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150 | |||
151 | RETURN res |
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152 | END read; |
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153 | |||
154 | |||
155 | PROCEDURE write* (file: FILE; chunk: ARRAY OF BYTE; bytes: INTEGER): INTEGER; |
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156 | VAR |
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157 | free, n, k, res, idx: INTEGER; |
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158 | |||
159 | BEGIN |
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160 | idx := 0; |
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161 | res := 0; |
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162 | IF (file # NIL) & (file.count >= 0) THEN |
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163 | |||
164 | free := LEN(file.buffer) - file.count; |
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165 | WHILE bytes > 0 DO |
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166 | n := MIN(free, bytes); |
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167 | copy(chunk, idx, file.buffer, file.count, n); |
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168 | INC(res, n); |
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169 | DEC(free, n); |
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170 | DEC(bytes, n); |
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171 | INC(idx, n); |
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172 | INC(file.count, n); |
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173 | IF free = 0 THEN |
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174 | k := flush(file); |
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175 | IF k # LEN(file.buffer) THEN |
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176 | bytes := 0; |
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177 | DEC(res, n) |
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178 | ELSE |
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179 | file.count := 0; |
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180 | free := LEN(file.buffer) |
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181 | END |
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182 | END |
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183 | END |
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184 | |||
185 | END |
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186 | |||
187 | RETURN res |
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188 | END write; |
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189 | |||
190 | |||
191 | PROCEDURE WriteByte* (file: FILE; byte: BYTE): BOOLEAN; |
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192 | VAR |
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7983 | leency | 193 | arr: ARRAY 1 OF BYTE; |
7597 | akron1 | 194 | |
195 | BEGIN |
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7983 | leency | 196 | arr[0] := byte |
197 | RETURN write(file, arr, 1) = 1 |
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7597 | akron1 | 198 | END WriteByte; |
199 | |||
200 | |||
201 | BEGIN |
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202 | files := C.create() |
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7983 | leency | 203 | END FILES.>> |