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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 | 4x 4x 1x 7x 90x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 4x 1x 1x 4000x 4000x 1x 4x 4x 4x 4x 1x 1x 1x 1x 4x 1x 1x 1x 1x 1x 1x | import { readFile, writeFile } from 'fs';
const createSauce = (
columns,
rows,
datatype,
filetype,
filesize,
doFlagsAndTInfoS,
iceColors,
letterSpacing,
) => {
const addText = (text, maxlength, index) => {
let i;
for (i = 0; i < maxlength; i += 1) {
sauce[i + index] = i < text.length ? text.charCodeAt(i) : 0x20;
}
};
const sauce = new Uint8Array(129);
sauce[0] = 0x1a;
sauce.set(new Uint8Array([0x53, 0x41, 0x55, 0x43, 0x45, 0x30, 0x30]), 1);
addText('', 35, 8);
addText('', 20, 43);
addText('', 20, 63);
const date = new Date();
addText(date.getFullYear().toString(10), 4, 83);
const month = date.getMonth() + 1;
addText(month < 10 ? '0' + month.toString(10) : month.toString(10), 2, 87);
const day = date.getDate();
addText(day < 10 ? '0' + day.toString(10) : day.toString(10), 2, 89);
sauce[91] = filesize & 0xff;
sauce[92] = (filesize >> 8) & 0xff;
sauce[93] = (filesize >> 16) & 0xff;
sauce[94] = filesize >> 24;
sauce[95] = datatype;
sauce[96] = filetype;
sauce[97] = columns & 0xff;
sauce[98] = columns >> 8;
sauce[99] = rows & 0xff;
sauce[100] = rows >> 8;
sauce[105] = 0;
Eif (doFlagsAndTInfoS === true) {
let flags = 0;
Iif (iceColors === true) {
flags += 1;
}
if (letterSpacing === false) {
flags += 1 << 1;
} else E{
flags += 1 << 2;
}
sauce[106] = flags;
const fontName = 'IBM VGA';
addText(fontName, fontName.length, 107);
}
return sauce;
};
const convert16BitArrayTo8BitArray = Uint16s => {
const Uint8s = new Uint8Array(Uint16s.length * 2);
for (let i = 0, j = 0; i < Uint16s.length; i++, j += 2) {
Uint8s[j] = Uint16s[i] >> 8;
Uint8s[j + 1] = Uint16s[i] & 255;
}
return Uint8s;
};
const bytesToString = (bytes, offset, size) => {
let text = '',
i;
for (i = 0; i < size; i++) {
text += String.fromCharCode(bytes[offset + i]);
}
return text;
};
const getSauce = (bytes, defaultColumnValue) => {
let sauce, fileSize, dataType, columns, rows, flags;
const removeTrailingWhitespace = text => {
return text.replace(/\s+$/, '');
};
if (bytes.length >= 128) {
sauce = bytes.slice(-128);
if (
bytesToString(sauce, 0, 5) === 'SAUCE' &&
bytesToString(sauce, 5, 2) === '00'
) {
fileSize =
(sauce[93] << 24) + (sauce[92] << 16) + (sauce[91] << 8) + sauce[90];
dataType = sauce[94];
if (dataType === 5) {
columns = sauce[95] * 2;
rows = fileSize / columns / 2;
} else {
columns = (sauce[97] << 8) + sauce[96];
rows = (sauce[99] << 8) + sauce[98];
}
flags = sauce[105];
return {
title: removeTrailingWhitespace(bytesToString(sauce, 7, 35)),
author: removeTrailingWhitespace(bytesToString(sauce, 42, 20)),
group: removeTrailingWhitespace(bytesToString(sauce, 62, 20)),
fileSize:
(sauce[93] << 24) + (sauce[92] << 16) + (sauce[91] << 8) + sauce[90],
columns: columns,
rows: rows,
iceColors: (flags & 0x01) === 1,
letterSpacing: ((flags >> 1) & 0x02) === 2,
};
}
}
return {
title: '',
author: '',
group: '',
fileSize: bytes.length,
columns: defaultColumnValue,
rows: undefined,
iceColors: false,
letterSpacing: false,
};
};
const convertUInt8ToUint16 = (uint8Array, start, size) => {
let i, j;
const uint16Array = new Uint16Array(size / 2);
for (i = 0, j = 0; i < size; i += 2, j += 1) {
uint16Array[j] = (uint8Array[start + i] << 8) + uint8Array[start + i + 1];
}
return uint16Array;
};
const load = (filename, callback) => {
readFile(filename, (err, bytes) => {
if (err) {
console.log(`${filename} not found, generating new canvas`);
callback(undefined);
} else E{
const sauce = getSauce(bytes, 160);
const data = convertUInt8ToUint16(
bytes,
0,
sauce.columns * sauce.rows * 2,
);
callback({
columns: sauce.columns,
rows: sauce.rows,
data: data,
iceColors: sauce.iceColors,
letterSpacing: sauce.letterSpacing,
});
}
});
};
const save = (filename, imageData, callback) => {
const data = convert16BitArrayTo8BitArray(imageData.data);
const sauce = createSauce(
0,
0,
5,
imageData.columns / 2,
data.length,
true,
imageData.iceColors,
imageData.letterSpacing,
);
const output = new Uint8Array(data.length + sauce.length);
output.set(data, 0);
output.set(sauce, data.length);
writeFile(filename, Buffer.from(output.buffer), () => {
if (callback !== undefined) {
callback();
}
});
};
export { load, save };
export default {
load: load,
save: save,
};
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