zip-iterator
Version:
Extract contents from zip archive type using an iterator API using streams or paths. Use stream interface and pipe transforms to add decompression algorithms
189 lines • 3.64 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
function _export(target, all) {
for(var name in all)Object.defineProperty(target, name, {
enumerable: true,
get: Object.getOwnPropertyDescriptor(all, name).get
});
}
_export(exports, {
get decodeCP437 () {
return decodeCP437;
},
get isAscii () {
return isAscii;
}
});
/**
* CP437 (Code Page 437) to Unicode conversion
*
* CP437 was the original IBM PC character set and is the default encoding
* for ZIP filenames when the UTF-8 flag (bit 11) is not set.
*
* Characters 0x00-0x7F are standard ASCII.
* Characters 0x80-0xFF are the extended characters that differ from Latin-1.
*/ // CP437 to Unicode mapping for bytes 0x80-0xFF
// prettier-ignore
var CP437_HIGH = [
// 0x80-0x8F
'\u00C7',
'\u00FC',
'\u00E9',
'\u00E2',
'\u00E4',
'\u00E0',
'\u00E5',
'\u00E7',
'\u00EA',
'\u00EB',
'\u00E8',
'\u00EF',
'\u00EE',
'\u00EC',
'\u00C4',
'\u00C5',
// 0x90-0x9F
'\u00C9',
'\u00E6',
'\u00C6',
'\u00F4',
'\u00F6',
'\u00F2',
'\u00FB',
'\u00F9',
'\u00FF',
'\u00D6',
'\u00DC',
'\u00A2',
'\u00A3',
'\u00A5',
'\u20A7',
'\u0192',
// 0xA0-0xAF
'\u00E1',
'\u00ED',
'\u00F3',
'\u00FA',
'\u00F1',
'\u00D1',
'\u00AA',
'\u00BA',
'\u00BF',
'\u2310',
'\u00AC',
'\u00BD',
'\u00BC',
'\u00A1',
'\u00AB',
'\u00BB',
// 0xB0-0xBF (box drawing light)
'\u2591',
'\u2592',
'\u2593',
'\u2502',
'\u2524',
'\u2561',
'\u2562',
'\u2556',
'\u2555',
'\u2563',
'\u2551',
'\u2557',
'\u255D',
'\u255C',
'\u255B',
'\u2510',
// 0xC0-0xCF (box drawing)
'\u2514',
'\u2534',
'\u252C',
'\u251C',
'\u2500',
'\u253C',
'\u255E',
'\u255F',
'\u255A',
'\u2554',
'\u2569',
'\u2566',
'\u2560',
'\u2550',
'\u256C',
'\u2567',
// 0xD0-0xDF (box drawing continued)
'\u2568',
'\u2564',
'\u2565',
'\u2559',
'\u2558',
'\u2552',
'\u2553',
'\u256B',
'\u256A',
'\u2518',
'\u250C',
'\u2588',
'\u2584',
'\u258C',
'\u2590',
'\u2580',
// 0xE0-0xEF (Greek letters)
'\u03B1',
'\u00DF',
'\u0393',
'\u03C0',
'\u03A3',
'\u03C3',
'\u00B5',
'\u03C4',
'\u03A6',
'\u0398',
'\u03A9',
'\u03B4',
'\u221E',
'\u03C6',
'\u03B5',
'\u2229',
// 0xF0-0xFF (math symbols)
'\u2261',
'\u00B1',
'\u2265',
'\u2264',
'\u2320',
'\u2321',
'\u00F7',
'\u2248',
'\u00B0',
'\u2219',
'\u00B7',
'\u221A',
'\u207F',
'\u00B2',
'\u25A0',
'\u00A0'
];
function decodeCP437(buf, start, end) {
var result = '';
for(var i = start; i < end; i++){
var byte = buf[i];
if (byte < 0x80) {
// Standard ASCII
result += String.fromCharCode(byte);
} else {
// Extended characters - use lookup table
result += CP437_HIGH[byte - 0x80];
}
}
return result;
}
function isAscii(buf, start, end) {
for(var i = start; i < end; i++){
if (buf[i] >= 0x80) {
return false;
}
}
return true;
}
/* CJS INTEROP */ if (exports.__esModule && exports.default) { try { Object.defineProperty(exports.default, '__esModule', { value: true }); for (var key in exports) { exports.default[key] = exports[key]; } } catch (_) {}; module.exports = exports.default; }