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| Rev | Author | Line No. | Line |
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| 7696 | akron1 | 1 | (* |
| 7597 | akron1 | 2 | BSD 2-Clause License |
| 3 | |||
| 7696 | akron1 | 4 | Copyright (c) 2018-2019, 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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| 20 | count: INTEGER |
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| 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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| 86 | file.count := 0 |
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| 87 | ELSE |
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| 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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| 193 | res: BOOLEAN; |
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| 194 | |||
| 195 | BEGIN |
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| 196 | res := TRUE; |
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| 197 | IF (file # NIL) & (file.count >= 0) THEN |
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| 198 | IF file.count = LEN(file.buffer) THEN |
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| 199 | IF flush(file) # LEN(file.buffer) THEN |
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| 200 | res := FALSE |
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| 201 | ELSE |
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| 202 | file.buffer[0] := byte; |
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| 203 | file.count := 1 |
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| 204 | END |
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| 205 | ELSE |
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| 206 | file.buffer[file.count] := byte; |
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| 207 | INC(file.count) |
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| 208 | END |
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| 209 | ELSE |
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| 210 | res := FALSE |
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| 211 | END |
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| 212 | |||
| 213 | RETURN res |
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| 214 | END WriteByte; |
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| 215 | |||
| 216 | |||
| 217 | BEGIN |
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| 218 | files := C.create() |
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| 7696 | akron1 | 219 | END FILES. |