imports
This commit is contained in:
Dmitry Shirokov
parent
b237d4c59f
commit
a93a9cd557
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testing.js
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java
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var util = require('util'),
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Match = require ('../match');
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/**
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* This is a superclass for the individual detectors for
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* each of the detectable members of the ISO 2022 family
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* of encodings.
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*/
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function ISO_2022() {};
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ISO_2022.prototype.match = function(det) {
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/**
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* Matching function shared among the 2022 detectors JP, CN and KR
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* Counts up the number of legal an unrecognized escape sequences in
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* the sample of text, and computes a score based on the total number &
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* the proportion that fit the encoding.
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*
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*
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* @param text the byte buffer containing text to analyse
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* @param textLen the size of the text in the byte.
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* @param escapeSequences the byte escape sequences to test for.
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* @return match quality, in the range of 0-100.
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*/
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var i, j;
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var escN;
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var hits = 0;
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var misses = 0;
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var shifts = 0;
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var quality;
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// TODO: refactor me
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// int match(byte [] text, int textLen, byte [][] escapeSequences) {
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// det.fInputBytes, det.fInputLen
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var text = det.fInputBytes;
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var textLen = det.fInputLen;
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scanInput:
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for (i=0; i<textLen; i++) {
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if (text[i] == 0x1b) {
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checkEscapes:
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for (escN=0; escN < this.escapeSequences.length; escN++) {
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var seq = this.escapeSequences[escN];
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if ((textLen - i) < seq.length) {
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continue checkEscapes;
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}
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for (j=1; j<seq.length; j++) {
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if (seq[j] != text[i+j]) {
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continue checkEscapes;
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}
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}
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hits++;
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i += seq.length-1;
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continue scanInput;
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}
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misses++;
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}
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if (text[i] == 0x0e || text[i] == 0x0f) {
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// Shift in/out
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shifts++;
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}
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}
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if (hits == 0) {
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return null;
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}
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//
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// Initial quality is based on relative proportion of recongized vs.
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// unrecognized escape sequences.
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// All good: quality = 100;
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// half or less good: quality = 0;
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// linear inbetween.
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quality = (100*hits - 100*misses) / (hits + misses);
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// Back off quality if there were too few escape sequences seen.
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// Include shifts in this computation, so that KR does not get penalized
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// for having only a single Escape sequence, but many shifts.
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if (hits+shifts < 5) {
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quality -= (5-(hits+shifts))*10;
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}
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if (quality < 0) {
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quality = 0;
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}
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// return quality;
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return quality == 0 ? null : new Match(det, this, quality);
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};
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module.exports.ISO_2022_JP = function() {
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this.name = "ISO-2022-JP";
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this.escapeSequences = [
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[ 0x1b, 0x24, 0x28, 0x43 ], // KS X 1001:1992
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[ 0x1b, 0x24, 0x28, 0x44 ], // JIS X 212-1990
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[ 0x1b, 0x24, 0x40 ], // JIS C 6226-1978
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[ 0x1b, 0x24, 0x41 ], // GB 2312-80
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[ 0x1b, 0x24, 0x42 ], // JIS X 208-1983
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[ 0x1b, 0x26, 0x40 ], // JIS X 208 1990, 1997
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[ 0x1b, 0x28, 0x42 ], // ASCII
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[ 0x1b, 0x28, 0x48 ], // JIS-Roman
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[ 0x1b, 0x28, 0x49 ], // Half-width katakana
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[ 0x1b, 0x28, 0x4a ], // JIS-Roman
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[ 0x1b, 0x2e, 0x41 ], // ISO 8859-1
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[ 0x1b, 0x2e, 0x46 ] // ISO 8859-7
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];
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};
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util.inherits(module.exports.ISO_2022_JP, ISO_2022);
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module.exports.ISO_2022_KR = function() {
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this.name = "ISO-2022-KR";
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this.escapeSequences = [
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[ 0x1b, 0x24, 0x29, 0x43 ]
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];
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};
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util.inherits(module.exports.ISO_2022_KR, ISO_2022);
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module.exports.ISO_2022_CN = function() {
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this.name = "ISO-2022-CN";
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this.escapeSequences = [
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[ 0x1b, 0x24, 0x29, 0x41 ], // GB 2312-80
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[ 0x1b, 0x24, 0x29, 0x47 ], // CNS 11643-1992 Plane 1
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[ 0x1b, 0x24, 0x2A, 0x48 ], // CNS 11643-1992 Plane 2
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[ 0x1b, 0x24, 0x29, 0x45 ], // ISO-IR-165
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[ 0x1b, 0x24, 0x2B, 0x49 ], // CNS 11643-1992 Plane 3
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[ 0x1b, 0x24, 0x2B, 0x4A ], // CNS 11643-1992 Plane 4
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[ 0x1b, 0x24, 0x2B, 0x4B ], // CNS 11643-1992 Plane 5
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[ 0x1b, 0x24, 0x2B, 0x4C ], // CNS 11643-1992 Plane 6
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[ 0x1b, 0x24, 0x2B, 0x4D ], // CNS 11643-1992 Plane 7
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[ 0x1b, 0x4e ], // SS2
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[ 0x1b, 0x4f ] // SS3
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];
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};
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util.inherits(module.exports.ISO_2022_CN, ISO_2022);
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var util = require('util'),
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Match = require ('../match');
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/**
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* Binary search implementation (recursive)
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*/
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function binarySearch(arr, searchValue) {
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function find(arr, searchValue, left, right) {
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if (right < left) {
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return -1;
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}
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/*
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int mid = mid = (left + right) / 2;
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There is a bug in the above line;
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Joshua Bloch suggests the following replacement:
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*/
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var mid = Math.floor((left + right) >>> 1);
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if (searchValue > arr[mid]) {
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return find(arr, searchValue, mid + 1, right);
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} else if (searchValue < arr[mid]) {
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return find(arr, searchValue, left, mid - 1);
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} else {
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return mid;
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}
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};
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return find(arr, searchValue, 0, arr.length - 1);
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};
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// "Character" iterated character class.
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// Recognizers for specific mbcs encodings make their "characters" available
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// by providing a nextChar() function that fills in an instance of iteratedChar
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// with the next char from the input.
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// The returned characters are not converted to Unicode, but remain as the raw
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// bytes (concatenated into an int) from the codepage data.
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//
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// For Asian charsets, use the raw input rather than the input that has been
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// stripped of markup. Detection only considers multi-byte chars, effectively
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// stripping markup anyway, and double byte chars do occur in markup too.
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//
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function IteratedChar() {
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this.charValue = 0; // 1-4 bytes from the raw input data
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this.index = 0;
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this.nextIndex = 0;
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this.error = false;
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this.done = false;
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this.reset = function() {
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this.charValue = 0;
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this.index = -1;
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this.nextIndex = 0;
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this.error = false;
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this.done = false;
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};
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this.nextByte = function(det) {
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if (this.nextIndex >= det.fRawLength) {
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this.done = true;
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return -1;
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}
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var byteValue = det.fRawInput[this.nextIndex++] & 0x00ff;
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return byteValue;
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};
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};
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/**
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* Asian double or multi-byte - charsets.
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* Match is determined mostly by the input data adhering to the
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* encoding scheme for the charset, and, optionally,
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* frequency-of-occurence of characters.
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*/
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function mbcs() {};
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/**
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* Test the match of this charset with the input text data
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* which is obtained via the CharsetDetector object.
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*
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* @param det The CharsetDetector, which contains the input text
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* to be checked for being in this charset.
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* @return Two values packed into one int (Damn java, anyhow)
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* <br/>
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* bits 0-7: the match confidence, ranging from 0-100
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* <br/>
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* bits 8-15: The match reason, an enum-like value.
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*/
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mbcs.prototype.match = function(det) {
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var singleByteCharCount = 0, //TODO Do we really need this?
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doubleByteCharCount = 0,
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commonCharCount = 0,
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badCharCount = 0,
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totalCharCount = 0,
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confidence = 0;
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var iter = new IteratedChar();
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detectBlock: {
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for (iter.reset(); this.nextChar(iter, det);) {
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totalCharCount++;
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if (iter.error) {
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badCharCount++;
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} else {
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var cv = iter.charValue & 0xFFFFFFFF;
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if (cv <= 0xff) {
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singleByteCharCount++;
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} else {
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doubleByteCharCount++;
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if (this.commonChars != null) {
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// NOTE: This assumes that there are no 4-byte common chars.
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if (binarySearch(this.commonChars, cv) >= 0) {
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commonCharCount++;
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}
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}
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}
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}
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if (badCharCount >= 2 && badCharCount*5 >= doubleByteCharCount) {
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console.log(1)
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// Bail out early if the byte data is not matching the encoding scheme.
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break detectBlock;
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}
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}
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if (doubleByteCharCount <= 10 && badCharCount== 0) {
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// Not many multi-byte chars.
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if (doubleByteCharCount == 0 && totalCharCount < 10) {
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// There weren't any multibyte sequences, and there was a low density of non-ASCII single bytes.
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// We don't have enough data to have any confidence.
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// Statistical analysis of single byte non-ASCII charcters would probably help here.
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confidence = 0;
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}
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else {
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// ASCII or ISO file? It's probably not our encoding,
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// but is not incompatible with our encoding, so don't give it a zero.
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confidence = 10;
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}
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break detectBlock;
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}
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//
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// No match if there are too many characters that don't fit the encoding scheme.
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// (should we have zero tolerance for these?)
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//
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if (doubleByteCharCount < 20*badCharCount) {
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confidence = 0;
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break detectBlock;
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}
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if (this.commonChars == null) {
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// We have no statistics on frequently occuring characters.
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// Assess confidence purely on having a reasonable number of
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// multi-byte characters (the more the better
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confidence = 30 + doubleByteCharCount - 20*badCharCount;
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if (confidence > 100) {
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confidence = 100;
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}
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} else {
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//
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// Frequency of occurence statistics exist.
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//
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var maxVal = Math.log(parseFloat(doubleByteCharCount) / 4);
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var scaleFactor = 90.0 / maxVal;
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confidence = Math.floor(Math.log(commonCharCount+1) * scaleFactor + 10);
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confidence = Math.min(confidence, 100);
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}
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} // end of detectBlock:
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return confidence == 0 ? null : new Match(det, this, confidence);
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};
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/**
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* Get the next character (however many bytes it is) from the input data
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* Subclasses for specific charset encodings must implement this function
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* to get characters according to the rules of their encoding scheme.
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*
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* This function is not a method of class iteratedChar only because
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* that would require a lot of extra derived classes, which is awkward.
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* @param it The iteratedChar "struct" into which the returned char is placed.
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* @param det The charset detector, which is needed to get at the input byte data
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* being iterated over.
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* @return True if a character was returned, false at end of input.
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*/
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mbcs.prototype.nextChar = function(iter, det) {};
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/**
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* Shift-JIS charset recognizer.
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*/
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module.exports.sjis = function() {
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this.name = "Shift_JIS";
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this.language = "ja";
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// TODO: This set of data comes from the character frequency-
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// of-occurence analysis tool. The data needs to be moved
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// into a resource and loaded from there.
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this.commonChars = [
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0x8140, 0x8141, 0x8142, 0x8145, 0x815b, 0x8169, 0x816a, 0x8175, 0x8176, 0x82a0,
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0x82a2, 0x82a4, 0x82a9, 0x82aa, 0x82ab, 0x82ad, 0x82af, 0x82b1, 0x82b3, 0x82b5,
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0x82b7, 0x82bd, 0x82be, 0x82c1, 0x82c4, 0x82c5, 0x82c6, 0x82c8, 0x82c9, 0x82cc,
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0x82cd, 0x82dc, 0x82e0, 0x82e7, 0x82e8, 0x82e9, 0x82ea, 0x82f0, 0x82f1, 0x8341,
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0x8343, 0x834e, 0x834f, 0x8358, 0x835e, 0x8362, 0x8367, 0x8375, 0x8376, 0x8389,
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0x838a, 0x838b, 0x838d, 0x8393, 0x8e96, 0x93fa, 0x95aa
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];
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this.nextChar = function(iter, det) {
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iter.index = iter.nextIndex;
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iter.error = false;
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var firstByte;
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firstByte = iter.charValue = iter.nextByte(det);
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// console.log('fb', firstByte)
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if (firstByte < 0) {
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return false;
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}
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if (firstByte <= 0x7f || (firstByte>0xa0 && firstByte<=0xdf)) {
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return true;
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}
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var secondByte = iter.nextByte(det);
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if (secondByte < 0) {
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return false;
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}
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iter.charValue = (firstByte << 8) | secondByte;
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if (! ((secondByte>=0x40 && secondByte<=0x7f) || (secondByte>=0x80 && secondByte<=0xff))) {
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// Illegal second byte value.
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iter.error = true;
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}
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return true;
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};
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};
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util.inherits(module.exports.sjis, mbcs);
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/**
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* Big5 charset recognizer.
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*/
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module.exports.big5 = function() {
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this.name = "Big5";
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this.language = "zh";
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// TODO: This set of data comes from the character frequency-
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// of-occurence analysis tool. The data needs to be moved
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// into a resource and loaded from there.
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this.commonChars = [
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0xa140, 0xa141, 0xa142, 0xa143, 0xa147, 0xa149, 0xa175, 0xa176, 0xa440, 0xa446,
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0xa447, 0xa448, 0xa451, 0xa454, 0xa457, 0xa464, 0xa46a, 0xa46c, 0xa477, 0xa4a3,
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0xa4a4, 0xa4a7, 0xa4c1, 0xa4ce, 0xa4d1, 0xa4df, 0xa4e8, 0xa4fd, 0xa540, 0xa548,
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0xa558, 0xa569, 0xa5cd, 0xa5e7, 0xa657, 0xa661, 0xa662, 0xa668, 0xa670, 0xa6a8,
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0xa6b3, 0xa6b9, 0xa6d3, 0xa6db, 0xa6e6, 0xa6f2, 0xa740, 0xa751, 0xa759, 0xa7da,
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0xa8a3, 0xa8a5, 0xa8ad, 0xa8d1, 0xa8d3, 0xa8e4, 0xa8fc, 0xa9c0, 0xa9d2, 0xa9f3,
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0xaa6b, 0xaaba, 0xaabe, 0xaacc, 0xaafc, 0xac47, 0xac4f, 0xacb0, 0xacd2, 0xad59,
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0xaec9, 0xafe0, 0xb0ea, 0xb16f, 0xb2b3, 0xb2c4, 0xb36f, 0xb44c, 0xb44e, 0xb54c,
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0xb5a5, 0xb5bd, 0xb5d0, 0xb5d8, 0xb671, 0xb7ed, 0xb867, 0xb944, 0xbad8, 0xbb44,
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0xbba1, 0xbdd1, 0xc2c4, 0xc3b9, 0xc440, 0xc45f
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];
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this.nextChar = function(iter, det) {
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iter.index = iter.nextIndex;
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iter.error = false;
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var firstByte;
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firstByte = iter.charValue = iter.nextByte(det);
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if (firstByte < 0) {
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return false;
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}
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if (firstByte <= 0x7f || firstByte == 0xff) {
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// single byte character.
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return true;
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}
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var secondByte = iter.nextByte(det);
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if (secondByte < 0) {
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return false;
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}
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iter.charValue = (iter.charValue << 8) | secondByte;
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if (secondByte < 0x40 ||
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secondByte == 0x7f ||
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secondByte == 0xff) {
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iter.error = true;
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}
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return true;
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};
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};
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util.inherits(module.exports.big5, mbcs);
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/**
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* EUC charset recognizers. One abstract class that provides the common function
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* for getting the next character according to the EUC encoding scheme,
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* and nested derived classes for EUC_KR, EUC_JP, EUC_CN.
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*
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*/
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module.exports.euc = function() {
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/*
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* Get the next character value for EUC based encodings.
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* Character "value" is simply the raw bytes that make up the character
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||||
* packed into an int.
|
||||
*/
|
||||
this.nextChar = function(iter, det) {
|
||||
it.index = it.nextIndex;
|
||||
iter.error = false;
|
||||
var firstByte = 0;
|
||||
var secondByte = 0;
|
||||
var thirdByte = 0;
|
||||
//int fourthByte = 0;
|
||||
buildChar: {
|
||||
firstByte = iter.charValue = iter.nextByte(det);
|
||||
if (firstByte < 0) {
|
||||
// Ran off the end of the input data
|
||||
iter.done = true;
|
||||
break buildChar;
|
||||
}
|
||||
if (firstByte <= 0x8d) {
|
||||
// single byte char
|
||||
break buildChar;
|
||||
}
|
||||
secondByte = iter.nextByte(det);
|
||||
iter.charValue = (iter.charValue << 8) | secondByte;
|
||||
if (firstByte >= 0xA1 && firstByte <= 0xfe) {
|
||||
// Two byte Char
|
||||
if (secondByte < 0xa1) {
|
||||
iter.error = true;
|
||||
}
|
||||
break buildChar;
|
||||
}
|
||||
if (firstByte == 0x8e) {
|
||||
// Code Set 2.
|
||||
// In EUC-JP, total char size is 2 bytes, only one byte of actual char value.
|
||||
// In EUC-TW, total char size is 4 bytes, three bytes contribute to char value.
|
||||
// We don't know which we've got.
|
||||
// Treat it like EUC-JP. If the data really was EUC-TW, the following two
|
||||
// bytes will look like a well formed 2 byte char.
|
||||
if (secondByte < 0xa1) {
|
||||
iter.error = true;
|
||||
}
|
||||
break buildChar;
|
||||
}
|
||||
if (firstByte == 0x8f) {
|
||||
// Code set 3.
|
||||
// Three byte total char size, two bytes of actual char value.
|
||||
thirdByte = iter.nextByte(det);
|
||||
iter.charValue = (iter.charValue << 8) | thirdByte;
|
||||
if (thirdByte < 0xa1) {
|
||||
iter.error = true;
|
||||
}
|
||||
}
|
||||
}
|
||||
return (iter.done == false);
|
||||
};
|
||||
};
|
||||
util.inherits(module.exports.euc, mbcs);
|
||||
|
||||
|
||||
|
||||
/**
|
||||
* The charset recognize for EUC-JP. A singleton instance of this class
|
||||
* is created and kept by the public CharsetDetector class
|
||||
*/
|
||||
module.exports.euc_jp = function() {
|
||||
this.name = "EUC-JP";
|
||||
this.language = "ja";
|
||||
|
||||
// TODO: This set of data comes from the character frequency-
|
||||
// of-occurence analysis tool. The data needs to be moved
|
||||
// into a resource and loaded from there.
|
||||
this.commonChars = [
|
||||
0xa1a1, 0xa1a2, 0xa1a3, 0xa1a6, 0xa1bc, 0xa1ca, 0xa1cb, 0xa1d6, 0xa1d7, 0xa4a2,
|
||||
0xa4a4, 0xa4a6, 0xa4a8, 0xa4aa, 0xa4ab, 0xa4ac, 0xa4ad, 0xa4af, 0xa4b1, 0xa4b3,
|
||||
0xa4b5, 0xa4b7, 0xa4b9, 0xa4bb, 0xa4bd, 0xa4bf, 0xa4c0, 0xa4c1, 0xa4c3, 0xa4c4,
|
||||
0xa4c6, 0xa4c7, 0xa4c8, 0xa4c9, 0xa4ca, 0xa4cb, 0xa4ce, 0xa4cf, 0xa4d0, 0xa4de,
|
||||
0xa4df, 0xa4e1, 0xa4e2, 0xa4e4, 0xa4e8, 0xa4e9, 0xa4ea, 0xa4eb, 0xa4ec, 0xa4ef,
|
||||
0xa4f2, 0xa4f3, 0xa5a2, 0xa5a3, 0xa5a4, 0xa5a6, 0xa5a7, 0xa5aa, 0xa5ad, 0xa5af,
|
||||
0xa5b0, 0xa5b3, 0xa5b5, 0xa5b7, 0xa5b8, 0xa5b9, 0xa5bf, 0xa5c3, 0xa5c6, 0xa5c7,
|
||||
0xa5c8, 0xa5c9, 0xa5cb, 0xa5d0, 0xa5d5, 0xa5d6, 0xa5d7, 0xa5de, 0xa5e0, 0xa5e1,
|
||||
0xa5e5, 0xa5e9, 0xa5ea, 0xa5eb, 0xa5ec, 0xa5ed, 0xa5f3, 0xb8a9, 0xb9d4, 0xbaee,
|
||||
0xbbc8, 0xbef0, 0xbfb7, 0xc4ea, 0xc6fc, 0xc7bd, 0xcab8, 0xcaf3, 0xcbdc, 0xcdd1
|
||||
];
|
||||
};
|
||||
util.inherits(module.exports.euc_jp, module.exports.euc);
|
||||
|
||||
|
||||
|
||||
/**
|
||||
* The charset recognize for EUC-KR. A singleton instance of this class
|
||||
* is created and kept by the public CharsetDetector class
|
||||
*/
|
||||
module.exports.euc_kr = function() {
|
||||
this.name = "EUC-KR";
|
||||
this.language = "ko";
|
||||
|
||||
// TODO: This set of data comes from the character frequency-
|
||||
// of-occurence analysis tool. The data needs to be moved
|
||||
// into a resource and loaded from there.
|
||||
this.commonChars = [
|
||||
0xb0a1, 0xb0b3, 0xb0c5, 0xb0cd, 0xb0d4, 0xb0e6, 0xb0ed, 0xb0f8, 0xb0fa, 0xb0fc,
|
||||
0xb1b8, 0xb1b9, 0xb1c7, 0xb1d7, 0xb1e2, 0xb3aa, 0xb3bb, 0xb4c2, 0xb4cf, 0xb4d9,
|
||||
0xb4eb, 0xb5a5, 0xb5b5, 0xb5bf, 0xb5c7, 0xb5e9, 0xb6f3, 0xb7af, 0xb7c2, 0xb7ce,
|
||||
0xb8a6, 0xb8ae, 0xb8b6, 0xb8b8, 0xb8bb, 0xb8e9, 0xb9ab, 0xb9ae, 0xb9cc, 0xb9ce,
|
||||
0xb9fd, 0xbab8, 0xbace, 0xbad0, 0xbaf1, 0xbbe7, 0xbbf3, 0xbbfd, 0xbcad, 0xbcba,
|
||||
0xbcd2, 0xbcf6, 0xbdba, 0xbdc0, 0xbdc3, 0xbdc5, 0xbec6, 0xbec8, 0xbedf, 0xbeee,
|
||||
0xbef8, 0xbefa, 0xbfa1, 0xbfa9, 0xbfc0, 0xbfe4, 0xbfeb, 0xbfec, 0xbff8, 0xc0a7,
|
||||
0xc0af, 0xc0b8, 0xc0ba, 0xc0bb, 0xc0bd, 0xc0c7, 0xc0cc, 0xc0ce, 0xc0cf, 0xc0d6,
|
||||
0xc0da, 0xc0e5, 0xc0fb, 0xc0fc, 0xc1a4, 0xc1a6, 0xc1b6, 0xc1d6, 0xc1df, 0xc1f6,
|
||||
0xc1f8, 0xc4a1, 0xc5cd, 0xc6ae, 0xc7cf, 0xc7d1, 0xc7d2, 0xc7d8, 0xc7e5, 0xc8ad
|
||||
];
|
||||
};
|
||||
util.inherits(module.exports.euc_kr, module.exports.euc);
|
||||
|
||||
|
||||
|
||||
/**
|
||||
* GB-18030 recognizer. Uses simplified Chinese statistics.
|
||||
*/
|
||||
module.exports.gb_18030 = function() {
|
||||
this.name = "GB18030";
|
||||
this.language = "zh";
|
||||
/*
|
||||
* (non-Javadoc)
|
||||
* Get the next character value for EUC based encodings.
|
||||
* Character "value" is simply the raw bytes that make up the character
|
||||
* packed into an int.
|
||||
*/
|
||||
this.nextChar = function(iter, det) {
|
||||
iter.index = iter.nextIndex;
|
||||
iter.error = false;
|
||||
var firstByte = 0;
|
||||
var secondByte = 0;
|
||||
var thirdByte = 0;
|
||||
var fourthByte = 0;
|
||||
buildChar: {
|
||||
firstByte = iter.charValue = iter.nextByte(det);
|
||||
if (firstByte < 0) {
|
||||
// Ran off the end of the input data
|
||||
iter.done = true;
|
||||
break buildChar;
|
||||
}
|
||||
if (firstByte <= 0x80) {
|
||||
// single byte char
|
||||
break buildChar;
|
||||
}
|
||||
secondByte = iter.nextByte(det);
|
||||
iter.charValue = (iter.charValue << 8) | secondByte;
|
||||
if (firstByte >= 0x81 && firstByte <= 0xFE) {
|
||||
// Two byte Char
|
||||
if ((secondByte >= 0x40 && secondByte <= 0x7E) || (secondByte >=80 && secondByte <=0xFE)) {
|
||||
break buildChar;
|
||||
}
|
||||
// Four byte char
|
||||
if (secondByte >= 0x30 && secondByte <= 0x39) {
|
||||
thirdByte = iter.nextByte(det);
|
||||
if (thirdByte >= 0x81 && thirdByte <= 0xFE) {
|
||||
fourthByte = iter.nextByte(det);
|
||||
if (fourthByte >= 0x30 && fourthByte <= 0x39) {
|
||||
iter.charValue = (iter.charValue << 16) | (thirdByte << 8) | fourthByte;
|
||||
break buildChar;
|
||||
}
|
||||
}
|
||||
}
|
||||
iter.error = true;
|
||||
break buildChar;
|
||||
}
|
||||
}
|
||||
return (iter.done == false);
|
||||
};
|
||||
|
||||
// TODO: This set of data comes from the character frequency-
|
||||
// of-occurence analysis tool. The data needs to be moved
|
||||
// into a resource and loaded from there.
|
||||
this.commonChars = [
|
||||
0xa1a1, 0xa1a2, 0xa1a3, 0xa1a4, 0xa1b0, 0xa1b1, 0xa1f1, 0xa1f3, 0xa3a1, 0xa3ac,
|
||||
0xa3ba, 0xb1a8, 0xb1b8, 0xb1be, 0xb2bb, 0xb3c9, 0xb3f6, 0xb4f3, 0xb5bd, 0xb5c4,
|
||||
0xb5e3, 0xb6af, 0xb6d4, 0xb6e0, 0xb7a2, 0xb7a8, 0xb7bd, 0xb7d6, 0xb7dd, 0xb8b4,
|
||||
0xb8df, 0xb8f6, 0xb9ab, 0xb9c9, 0xb9d8, 0xb9fa, 0xb9fd, 0xbacd, 0xbba7, 0xbbd6,
|
||||
0xbbe1, 0xbbfa, 0xbcbc, 0xbcdb, 0xbcfe, 0xbdcc, 0xbecd, 0xbedd, 0xbfb4, 0xbfc6,
|
||||
0xbfc9, 0xc0b4, 0xc0ed, 0xc1cb, 0xc2db, 0xc3c7, 0xc4dc, 0xc4ea, 0xc5cc, 0xc6f7,
|
||||
0xc7f8, 0xc8ab, 0xc8cb, 0xc8d5, 0xc8e7, 0xc9cf, 0xc9fa, 0xcab1, 0xcab5, 0xcac7,
|
||||
0xcad0, 0xcad6, 0xcaf5, 0xcafd, 0xccec, 0xcdf8, 0xceaa, 0xcec4, 0xced2, 0xcee5,
|
||||
0xcfb5, 0xcfc2, 0xcfd6, 0xd0c2, 0xd0c5, 0xd0d0, 0xd0d4, 0xd1a7, 0xd2aa, 0xd2b2,
|
||||
0xd2b5, 0xd2bb, 0xd2d4, 0xd3c3, 0xd3d0, 0xd3fd, 0xd4c2, 0xd4da, 0xd5e2, 0xd6d0
|
||||
];
|
||||
};
|
||||
util.inherits(module.exports.gb_18030, mbcs);
|
||||
|
|
@ -0,0 +1,508 @@
|
|||
var util = require('util'),
|
||||
Match = require ('../match');
|
||||
|
||||
/**
|
||||
* This class recognizes single-byte encodings. Because the encoding scheme is so
|
||||
* simple, language statistics are used to do the matching.
|
||||
*/
|
||||
|
||||
function NGramParser(theNgramList, theByteMap) {
|
||||
var N_GRAM_MASK = 0xFFFFFF;
|
||||
|
||||
this.byteIndex = 0;
|
||||
this.ngram = 0;
|
||||
|
||||
this.ngramList = theNgramList;
|
||||
this.byteMap = theByteMap;
|
||||
|
||||
this.ngramCount = 0;
|
||||
this.hitCount = 0;
|
||||
|
||||
this.spaceChar;
|
||||
|
||||
/*
|
||||
* Binary search for value in table, which must have exactly 64 entries.
|
||||
*/
|
||||
this.search = function(table, value) {
|
||||
var index = 0;
|
||||
|
||||
if (table[index + 32] <= value) {
|
||||
index += 32;
|
||||
}
|
||||
|
||||
if (table[index + 16] <= value) {
|
||||
index += 16;
|
||||
}
|
||||
|
||||
if (table[index + 8] <= value) {
|
||||
index += 8;
|
||||
}
|
||||
|
||||
if (table[index + 4] <= value) {
|
||||
index += 4;
|
||||
}
|
||||
|
||||
if (table[index + 2] <= value) {
|
||||
index += 2;
|
||||
}
|
||||
|
||||
if (table[index + 1] <= value) {
|
||||
index += 1;
|
||||
}
|
||||
|
||||
if (table[index] > value) {
|
||||
index -= 1;
|
||||
}
|
||||
|
||||
if (index < 0 || table[index] != value) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
return index;
|
||||
};
|
||||
|
||||
this.lookup = function(thisNgram) {
|
||||
this.ngramCount += 1;
|
||||
if (this.search(this.ngramList, thisNgram) >= 0) {
|
||||
this.hitCount += 1;
|
||||
}
|
||||
};
|
||||
|
||||
this.addByte = function(b) {
|
||||
this.ngram = ((this.ngram << 8) + (b & 0xFF)) & N_GRAM_MASK;
|
||||
this.lookup(this.ngram);
|
||||
}
|
||||
|
||||
this.nextByte = function(det)
|
||||
{
|
||||
if (this.byteIndex >= det.fInputLen) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
return det.fInputBytes[this.byteIndex++] & 0xFF;
|
||||
}
|
||||
|
||||
// public int parse(CharsetDetector det)
|
||||
// {
|
||||
// return parse (det, (byte)0x20);
|
||||
// }
|
||||
|
||||
this.parse = function(det, spaceCh) {
|
||||
var b;
|
||||
var ignoreSpace = false;
|
||||
this.spaceChar = spaceCh;
|
||||
|
||||
while ((b = this.nextByte(det)) >= 0) {
|
||||
var mb = this.byteMap[b];
|
||||
|
||||
// TODO: 0x20 might not be a space in all character sets...
|
||||
if (mb != 0) {
|
||||
if (!(mb == this.spaceChar && ignoreSpace)) {
|
||||
this.addByte(mb);
|
||||
}
|
||||
|
||||
ignoreSpace = (mb == this.spaceChar);
|
||||
}
|
||||
}
|
||||
|
||||
// TODO: Is this OK? The buffer could have ended in the middle of a word...
|
||||
this.addByte(this.spaceChar);
|
||||
|
||||
var rawPercent = this.hitCount / this.ngramCount;
|
||||
|
||||
// if (rawPercent <= 2.0) {
|
||||
// return 0;
|
||||
// }
|
||||
|
||||
// TODO - This is a bit of a hack to take care of a case
|
||||
// were we were getting a confidence of 135...
|
||||
if (rawPercent > 0.33) {
|
||||
return 98;
|
||||
}
|
||||
|
||||
return Math.floor(rawPercent * 300.0);
|
||||
};
|
||||
};
|
||||
|
||||
function NGramsPlusLang(la, ng) {
|
||||
this.fLang = la;
|
||||
this.fNGrams = ng;
|
||||
};
|
||||
|
||||
function sbcs() {};
|
||||
sbcs.prototype.spaceChar = 0x20;
|
||||
sbcs.prototype.ngrams = [];
|
||||
sbcs.prototype.byteMap = [];
|
||||
sbcs.prototype.match = function(det) {
|
||||
|
||||
var multiple = (this.ngrams instanceof Array && this.ngrams[0] instanceof Array);
|
||||
if (multiple) {
|
||||
var bestConfidenceSoFar = -1;
|
||||
var lang = null;
|
||||
|
||||
for (var i = this.ngrams.length - 1; i >= 0; i--) {
|
||||
var ngl = this.ngrams[i];
|
||||
|
||||
var parser = new NGramParser(ngl.fNGrams, this.byteMap);
|
||||
var confidence = parser.parse(det, this.spaceChar);
|
||||
if (confidence > bestConfidenceSoFar) {
|
||||
bestConfidenceSoFar = confidence;
|
||||
lang = ngl.fLang;
|
||||
}
|
||||
}
|
||||
|
||||
var name = this.getName(det);
|
||||
return bestConfidenceSoFar <= 0 ? null : new Match(det, this, bestConfidenceSoFar, name, lang);
|
||||
}
|
||||
|
||||
var parser = new NGramParser(this.ngrams, this.byteMap);
|
||||
var confidence = parser.parse(det, this.spaceChar);
|
||||
return confidence <= 0 ? null : new Match(det, this, confidence);
|
||||
};
|
||||
|
||||
|
||||
module.exports.ISO_8859_1 = function() {
|
||||
this.byteMap = [
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
|
||||
0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F,
|
||||
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
|
||||
0x78, 0x79, 0x7A, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
|
||||
0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F,
|
||||
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
|
||||
0x78, 0x79, 0x7A, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0xAA, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0xB5, 0x20, 0x20,
|
||||
0x20, 0x20, 0xBA, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7,
|
||||
0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF,
|
||||
0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0x20,
|
||||
0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xDF,
|
||||
0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7,
|
||||
0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF,
|
||||
0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0x20,
|
||||
0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF
|
||||
];
|
||||
|
||||
this.ngrams = [
|
||||
new NGramsPlusLang("da", [
|
||||
0x206166, 0x206174, 0x206465, 0x20656E, 0x206572, 0x20666F, 0x206861, 0x206920, 0x206D65, 0x206F67, 0x2070E5, 0x207369, 0x207374, 0x207469, 0x207669, 0x616620,
|
||||
0x616E20, 0x616E64, 0x617220, 0x617420, 0x646520, 0x64656E, 0x646572, 0x646574, 0x652073, 0x656420, 0x656465, 0x656E20, 0x656E64, 0x657220, 0x657265, 0x657320,
|
||||
0x657420, 0x666F72, 0x676520, 0x67656E, 0x676572, 0x696765, 0x696C20, 0x696E67, 0x6B6520, 0x6B6B65, 0x6C6572, 0x6C6967, 0x6C6C65, 0x6D6564, 0x6E6465, 0x6E6520,
|
||||
0x6E6720, 0x6E6765, 0x6F6720, 0x6F6D20, 0x6F7220, 0x70E520, 0x722064, 0x722065, 0x722073, 0x726520, 0x737465, 0x742073, 0x746520, 0x746572, 0x74696C, 0x766572
|
||||
]),
|
||||
new NGramsPlusLang("de", [
|
||||
0x20616E, 0x206175, 0x206265, 0x206461, 0x206465, 0x206469, 0x206569, 0x206765, 0x206861, 0x20696E, 0x206D69, 0x207363, 0x207365, 0x20756E, 0x207665, 0x20766F,
|
||||
0x207765, 0x207A75, 0x626572, 0x636820, 0x636865, 0x636874, 0x646173, 0x64656E, 0x646572, 0x646965, 0x652064, 0x652073, 0x65696E, 0x656974, 0x656E20, 0x657220,
|
||||
0x657320, 0x67656E, 0x68656E, 0x687420, 0x696368, 0x696520, 0x696E20, 0x696E65, 0x697420, 0x6C6963, 0x6C6C65, 0x6E2061, 0x6E2064, 0x6E2073, 0x6E6420, 0x6E6465,
|
||||
0x6E6520, 0x6E6720, 0x6E6765, 0x6E7465, 0x722064, 0x726465, 0x726569, 0x736368, 0x737465, 0x742064, 0x746520, 0x74656E, 0x746572, 0x756E64, 0x756E67, 0x766572
|
||||
]),
|
||||
new NGramsPlusLang("en", [
|
||||
0x206120, 0x20616E, 0x206265, 0x20636F, 0x20666F, 0x206861, 0x206865, 0x20696E, 0x206D61, 0x206F66, 0x207072, 0x207265, 0x207361, 0x207374, 0x207468, 0x20746F,
|
||||
0x207768, 0x616964, 0x616C20, 0x616E20, 0x616E64, 0x617320, 0x617420, 0x617465, 0x617469, 0x642061, 0x642074, 0x652061, 0x652073, 0x652074, 0x656420, 0x656E74,
|
||||
0x657220, 0x657320, 0x666F72, 0x686174, 0x686520, 0x686572, 0x696420, 0x696E20, 0x696E67, 0x696F6E, 0x697320, 0x6E2061, 0x6E2074, 0x6E6420, 0x6E6720, 0x6E7420,
|
||||
0x6F6620, 0x6F6E20, 0x6F7220, 0x726520, 0x727320, 0x732061, 0x732074, 0x736169, 0x737420, 0x742074, 0x746572, 0x746861, 0x746865, 0x74696F, 0x746F20, 0x747320
|
||||
]),
|
||||
new NGramsPlusLang("es", [
|
||||
0x206120, 0x206361, 0x20636F, 0x206465, 0x20656C, 0x20656E, 0x206573, 0x20696E, 0x206C61, 0x206C6F, 0x207061, 0x20706F, 0x207072, 0x207175, 0x207265, 0x207365,
|
||||
0x20756E, 0x207920, 0x612063, 0x612064, 0x612065, 0x61206C, 0x612070, 0x616369, 0x61646F, 0x616C20, 0x617220, 0x617320, 0x6369F3, 0x636F6E, 0x646520, 0x64656C,
|
||||
0x646F20, 0x652064, 0x652065, 0x65206C, 0x656C20, 0x656E20, 0x656E74, 0x657320, 0x657374, 0x69656E, 0x69F36E, 0x6C6120, 0x6C6F73, 0x6E2065, 0x6E7465, 0x6F2064,
|
||||
0x6F2065, 0x6F6E20, 0x6F7220, 0x6F7320, 0x706172, 0x717565, 0x726120, 0x726573, 0x732064, 0x732065, 0x732070, 0x736520, 0x746520, 0x746F20, 0x756520, 0xF36E20
|
||||
]),
|
||||
new NGramsPlusLang("fr", [
|
||||
0x206175, 0x20636F, 0x206461, 0x206465, 0x206475, 0x20656E, 0x206574, 0x206C61, 0x206C65, 0x207061, 0x20706F, 0x207072, 0x207175, 0x207365, 0x20736F, 0x20756E,
|
||||
0x20E020, 0x616E74, 0x617469, 0x636520, 0x636F6E, 0x646520, 0x646573, 0x647520, 0x652061, 0x652063, 0x652064, 0x652065, 0x65206C, 0x652070, 0x652073, 0x656E20,
|
||||
0x656E74, 0x657220, 0x657320, 0x657420, 0x657572, 0x696F6E, 0x697320, 0x697420, 0x6C6120, 0x6C6520, 0x6C6573, 0x6D656E, 0x6E2064, 0x6E6520, 0x6E7320, 0x6E7420,
|
||||
0x6F6E20, 0x6F6E74, 0x6F7572, 0x717565, 0x72206C, 0x726520, 0x732061, 0x732064, 0x732065, 0x73206C, 0x732070, 0x742064, 0x746520, 0x74696F, 0x756520, 0x757220
|
||||
]),
|
||||
new NGramsPlusLang("it", [
|
||||
0x20616C, 0x206368, 0x20636F, 0x206465, 0x206469, 0x206520, 0x20696C, 0x20696E, 0x206C61, 0x207065, 0x207072, 0x20756E, 0x612063, 0x612064, 0x612070, 0x612073,
|
||||
0x61746F, 0x636865, 0x636F6E, 0x64656C, 0x646920, 0x652061, 0x652063, 0x652064, 0x652069, 0x65206C, 0x652070, 0x652073, 0x656C20, 0x656C6C, 0x656E74, 0x657220,
|
||||
0x686520, 0x692061, 0x692063, 0x692064, 0x692073, 0x696120, 0x696C20, 0x696E20, 0x696F6E, 0x6C6120, 0x6C6520, 0x6C6920, 0x6C6C61, 0x6E6520, 0x6E6920, 0x6E6F20,
|
||||
0x6E7465, 0x6F2061, 0x6F2064, 0x6F2069, 0x6F2073, 0x6F6E20, 0x6F6E65, 0x706572, 0x726120, 0x726520, 0x736920, 0x746120, 0x746520, 0x746920, 0x746F20, 0x7A696F
|
||||
]),
|
||||
new NGramsPlusLang("nl", [
|
||||
0x20616C, 0x206265, 0x206461, 0x206465, 0x206469, 0x206565, 0x20656E, 0x206765, 0x206865, 0x20696E, 0x206D61, 0x206D65, 0x206F70, 0x207465, 0x207661, 0x207665,
|
||||
0x20766F, 0x207765, 0x207A69, 0x61616E, 0x616172, 0x616E20, 0x616E64, 0x617220, 0x617420, 0x636874, 0x646520, 0x64656E, 0x646572, 0x652062, 0x652076, 0x65656E,
|
||||
0x656572, 0x656E20, 0x657220, 0x657273, 0x657420, 0x67656E, 0x686574, 0x696520, 0x696E20, 0x696E67, 0x697320, 0x6E2062, 0x6E2064, 0x6E2065, 0x6E2068, 0x6E206F,
|
||||
0x6E2076, 0x6E6465, 0x6E6720, 0x6F6E64, 0x6F6F72, 0x6F7020, 0x6F7220, 0x736368, 0x737465, 0x742064, 0x746520, 0x74656E, 0x746572, 0x76616E, 0x766572, 0x766F6F
|
||||
]),
|
||||
new NGramsPlusLang("no", [
|
||||
0x206174, 0x206176, 0x206465, 0x20656E, 0x206572, 0x20666F, 0x206861, 0x206920, 0x206D65, 0x206F67, 0x2070E5, 0x207365, 0x20736B, 0x20736F, 0x207374, 0x207469,
|
||||
0x207669, 0x20E520, 0x616E64, 0x617220, 0x617420, 0x646520, 0x64656E, 0x646574, 0x652073, 0x656420, 0x656E20, 0x656E65, 0x657220, 0x657265, 0x657420, 0x657474,
|
||||
0x666F72, 0x67656E, 0x696B6B, 0x696C20, 0x696E67, 0x6B6520, 0x6B6B65, 0x6C6520, 0x6C6C65, 0x6D6564, 0x6D656E, 0x6E2073, 0x6E6520, 0x6E6720, 0x6E6765, 0x6E6E65,
|
||||
0x6F6720, 0x6F6D20, 0x6F7220, 0x70E520, 0x722073, 0x726520, 0x736F6D, 0x737465, 0x742073, 0x746520, 0x74656E, 0x746572, 0x74696C, 0x747420, 0x747465, 0x766572
|
||||
]),
|
||||
new NGramsPlusLang("pt", [
|
||||
0x206120, 0x20636F, 0x206461, 0x206465, 0x20646F, 0x206520, 0x206573, 0x206D61, 0x206E6F, 0x206F20, 0x207061, 0x20706F, 0x207072, 0x207175, 0x207265, 0x207365,
|
||||
0x20756D, 0x612061, 0x612063, 0x612064, 0x612070, 0x616465, 0x61646F, 0x616C20, 0x617220, 0x617261, 0x617320, 0x636F6D, 0x636F6E, 0x646120, 0x646520, 0x646F20,
|
||||
0x646F73, 0x652061, 0x652064, 0x656D20, 0x656E74, 0x657320, 0x657374, 0x696120, 0x696361, 0x6D656E, 0x6E7465, 0x6E746F, 0x6F2061, 0x6F2063, 0x6F2064, 0x6F2065,
|
||||
0x6F2070, 0x6F7320, 0x706172, 0x717565, 0x726120, 0x726573, 0x732061, 0x732064, 0x732065, 0x732070, 0x737461, 0x746520, 0x746F20, 0x756520, 0xE36F20, 0xE7E36F
|
||||
]),
|
||||
new NGramsPlusLang("sv", [
|
||||
0x206174, 0x206176, 0x206465, 0x20656E, 0x2066F6, 0x206861, 0x206920, 0x20696E, 0x206B6F, 0x206D65, 0x206F63, 0x2070E5, 0x20736B, 0x20736F, 0x207374, 0x207469,
|
||||
0x207661, 0x207669, 0x20E472, 0x616465, 0x616E20, 0x616E64, 0x617220, 0x617474, 0x636820, 0x646520, 0x64656E, 0x646572, 0x646574, 0x656420, 0x656E20, 0x657220,
|
||||
0x657420, 0x66F672, 0x67656E, 0x696C6C, 0x696E67, 0x6B6120, 0x6C6C20, 0x6D6564, 0x6E2073, 0x6E6120, 0x6E6465, 0x6E6720, 0x6E6765, 0x6E696E, 0x6F6368, 0x6F6D20,
|
||||
0x6F6E20, 0x70E520, 0x722061, 0x722073, 0x726120, 0x736B61, 0x736F6D, 0x742073, 0x746120, 0x746520, 0x746572, 0x74696C, 0x747420, 0x766172, 0xE47220, 0xF67220,
|
||||
])
|
||||
];
|
||||
|
||||
this.getName = function(det) {
|
||||
if (typeof det == 'undefined')
|
||||
return "ISO-8859-1";
|
||||
return det.fC1Bytes ? "windows-1252" : "ISO-8859-1";
|
||||
};
|
||||
};
|
||||
util.inherits(module.exports.ISO_8859_1, sbcs);
|
||||
|
||||
|
||||
module.exports.ISO_8859_2 = function() {
|
||||
this.byteMap = [
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
|
||||
0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F,
|
||||
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
|
||||
0x78, 0x79, 0x7A, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
|
||||
0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F,
|
||||
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
|
||||
0x78, 0x79, 0x7A, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0xB1, 0x20, 0xB3, 0x20, 0xB5, 0xB6, 0x20,
|
||||
0x20, 0xB9, 0xBA, 0xBB, 0xBC, 0x20, 0xBE, 0xBF,
|
||||
0x20, 0xB1, 0x20, 0xB3, 0x20, 0xB5, 0xB6, 0xB7,
|
||||
0x20, 0xB9, 0xBA, 0xBB, 0xBC, 0x20, 0xBE, 0xBF,
|
||||
0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7,
|
||||
0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF,
|
||||
0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0x20,
|
||||
0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xDF,
|
||||
0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7,
|
||||
0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF,
|
||||
0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0x20,
|
||||
0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0x20
|
||||
];
|
||||
|
||||
this.ngrams = [
|
||||
new NGramsPlusLang("cs", [
|
||||
0x206120, 0x206279, 0x20646F, 0x206A65, 0x206E61, 0x206E65, 0x206F20, 0x206F64, 0x20706F, 0x207072, 0x2070F8, 0x20726F, 0x207365, 0x20736F, 0x207374, 0x20746F,
|
||||
0x207620, 0x207679, 0x207A61, 0x612070, 0x636520, 0x636820, 0x652070, 0x652073, 0x652076, 0x656D20, 0x656EED, 0x686F20, 0x686F64, 0x697374, 0x6A6520, 0x6B7465,
|
||||
0x6C6520, 0x6C6920, 0x6E6120, 0x6EE920, 0x6EEC20, 0x6EED20, 0x6F2070, 0x6F646E, 0x6F6A69, 0x6F7374, 0x6F7520, 0x6F7661, 0x706F64, 0x706F6A, 0x70726F, 0x70F865,
|
||||
0x736520, 0x736F75, 0x737461, 0x737469, 0x73746E, 0x746572, 0x746EED, 0x746F20, 0x752070, 0xBE6520, 0xE16EED, 0xE9686F, 0xED2070, 0xED2073, 0xED6D20, 0xF86564,
|
||||
]),
|
||||
new NGramsPlusLang("hu", [
|
||||
0x206120, 0x20617A, 0x206265, 0x206567, 0x20656C, 0x206665, 0x206861, 0x20686F, 0x206973, 0x206B65, 0x206B69, 0x206BF6, 0x206C65, 0x206D61, 0x206D65, 0x206D69,
|
||||
0x206E65, 0x20737A, 0x207465, 0x20E973, 0x612061, 0x61206B, 0x61206D, 0x612073, 0x616B20, 0x616E20, 0x617A20, 0x62616E, 0x62656E, 0x656779, 0x656B20, 0x656C20,
|
||||
0x656C65, 0x656D20, 0x656E20, 0x657265, 0x657420, 0x657465, 0x657474, 0x677920, 0x686F67, 0x696E74, 0x697320, 0x6B2061, 0x6BF67A, 0x6D6567, 0x6D696E, 0x6E2061,
|
||||
0x6E616B, 0x6E656B, 0x6E656D, 0x6E7420, 0x6F6779, 0x732061, 0x737A65, 0x737A74, 0x737AE1, 0x73E967, 0x742061, 0x747420, 0x74E173, 0x7A6572, 0xE16E20, 0xE97320,
|
||||
]),
|
||||
new NGramsPlusLang("pl", [
|
||||
0x20637A, 0x20646F, 0x206920, 0x206A65, 0x206B6F, 0x206D61, 0x206D69, 0x206E61, 0x206E69, 0x206F64, 0x20706F, 0x207072, 0x207369, 0x207720, 0x207769, 0x207779,
|
||||
0x207A20, 0x207A61, 0x612070, 0x612077, 0x616E69, 0x636820, 0x637A65, 0x637A79, 0x646F20, 0x647A69, 0x652070, 0x652073, 0x652077, 0x65207A, 0x65676F, 0x656A20,
|
||||
0x656D20, 0x656E69, 0x676F20, 0x696120, 0x696520, 0x69656A, 0x6B6120, 0x6B6920, 0x6B6965, 0x6D6965, 0x6E6120, 0x6E6961, 0x6E6965, 0x6F2070, 0x6F7761, 0x6F7769,
|
||||
0x706F6C, 0x707261, 0x70726F, 0x70727A, 0x727A65, 0x727A79, 0x7369EA, 0x736B69, 0x737461, 0x776965, 0x796368, 0x796D20, 0x7A6520, 0x7A6965, 0x7A7920, 0xF37720,
|
||||
]),
|
||||
new NGramsPlusLang("ro", [
|
||||
0x206120, 0x206163, 0x206361, 0x206365, 0x20636F, 0x206375, 0x206465, 0x206469, 0x206C61, 0x206D61, 0x207065, 0x207072, 0x207365, 0x2073E3, 0x20756E, 0x20BA69,
|
||||
0x20EE6E, 0x612063, 0x612064, 0x617265, 0x617420, 0x617465, 0x617520, 0x636172, 0x636F6E, 0x637520, 0x63E320, 0x646520, 0x652061, 0x652063, 0x652064, 0x652070,
|
||||
0x652073, 0x656120, 0x656920, 0x656C65, 0x656E74, 0x657374, 0x692061, 0x692063, 0x692064, 0x692070, 0x696520, 0x696920, 0x696E20, 0x6C6120, 0x6C6520, 0x6C6F72,
|
||||
0x6C7569, 0x6E6520, 0x6E7472, 0x6F7220, 0x70656E, 0x726520, 0x726561, 0x727520, 0x73E320, 0x746520, 0x747275, 0x74E320, 0x756920, 0x756C20, 0xBA6920, 0xEE6E20,
|
||||
])
|
||||
];
|
||||
|
||||
this.getName = function(det) {
|
||||
if (typeof det == 'undefined')
|
||||
return "ISO-8859-2";
|
||||
return det.fC1Bytes ? "windows-1250" : "ISO-8859-2";
|
||||
};
|
||||
};
|
||||
util.inherits(module.exports.ISO_8859_2, sbcs);
|
||||
|
||||
|
||||
module.exports.ISO_8859_5 = function() {
|
||||
this.byteMap = [
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
|
||||
0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F,
|
||||
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
|
||||
0x78, 0x79, 0x7A, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
|
||||
0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F,
|
||||
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
|
||||
0x78, 0x79, 0x7A, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7,
|
||||
0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0x20, 0xFE, 0xFF,
|
||||
0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7,
|
||||
0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF,
|
||||
0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7,
|
||||
0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF,
|
||||
0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7,
|
||||
0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF,
|
||||
0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7,
|
||||
0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF,
|
||||
0x20, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7,
|
||||
0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0x20, 0xFE, 0xFF
|
||||
];
|
||||
|
||||
this.ngrams = [
|
||||
0x20D220, 0x20D2DE, 0x20D4DE, 0x20D7D0, 0x20D820, 0x20DAD0, 0x20DADE, 0x20DDD0, 0x20DDD5, 0x20DED1, 0x20DFDE, 0x20DFE0, 0x20E0D0, 0x20E1DE, 0x20E1E2, 0x20E2DE,
|
||||
0x20E7E2, 0x20EDE2, 0xD0DDD8, 0xD0E2EC, 0xD3DE20, 0xD5DBEC, 0xD5DDD8, 0xD5E1E2, 0xD5E220, 0xD820DF, 0xD8D520, 0xD8D820, 0xD8EF20, 0xDBD5DD, 0xDBD820, 0xDBECDD,
|
||||
0xDDD020, 0xDDD520, 0xDDD8D5, 0xDDD8EF, 0xDDDE20, 0xDDDED2, 0xDE20D2, 0xDE20DF, 0xDE20E1, 0xDED220, 0xDED2D0, 0xDED3DE, 0xDED920, 0xDEDBEC, 0xDEDC20, 0xDEE1E2,
|
||||
0xDFDEDB, 0xDFE0D5, 0xDFE0D8, 0xDFE0DE, 0xE0D0D2, 0xE0D5D4, 0xE1E2D0, 0xE1E2D2, 0xE1E2D8, 0xE1EF20, 0xE2D5DB, 0xE2DE20, 0xE2DEE0, 0xE2EC20, 0xE7E2DE, 0xEBE520
|
||||
];
|
||||
|
||||
this.getName = function(det) {
|
||||
return "ISO-8859-5";
|
||||
};
|
||||
|
||||
this.getLanguage = function() {
|
||||
return "ru";
|
||||
};
|
||||
};
|
||||
util.inherits(module.exports.ISO_8859_5, sbcs);
|
||||
|
||||
|
||||
module.exports.ISO_8859_6 = function() {
|
||||
this.byteMap = [
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
|
||||
0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F,
|
||||
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
|
||||
0x78, 0x79, 0x7A, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
|
||||
0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F,
|
||||
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
|
||||
0x78, 0x79, 0x7A, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7,
|
||||
0xC8, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF,
|
||||
0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7,
|
||||
0xD8, 0xD9, 0xDA, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7,
|
||||
0xE8, 0xE9, 0xEA, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20
|
||||
];
|
||||
|
||||
this.ngrams = [
|
||||
0x20C7E4, 0x20C7E6, 0x20C8C7, 0x20D9E4, 0x20E1EA, 0x20E4E4, 0x20E5E6, 0x20E8C7, 0xC720C7, 0xC7C120, 0xC7CA20, 0xC7D120, 0xC7E420, 0xC7E4C3, 0xC7E4C7, 0xC7E4C8,
|
||||
0xC7E4CA, 0xC7E4CC, 0xC7E4CD, 0xC7E4CF, 0xC7E4D3, 0xC7E4D9, 0xC7E4E2, 0xC7E4E5, 0xC7E4E8, 0xC7E4EA, 0xC7E520, 0xC7E620, 0xC7E6CA, 0xC820C7, 0xC920C7, 0xC920E1,
|
||||
0xC920E4, 0xC920E5, 0xC920E8, 0xCA20C7, 0xCF20C7, 0xCFC920, 0xD120C7, 0xD1C920, 0xD320C7, 0xD920C7, 0xD9E4E9, 0xE1EA20, 0xE420C7, 0xE4C920, 0xE4E920, 0xE4EA20,
|
||||
0xE520C7, 0xE5C720, 0xE5C920, 0xE5E620, 0xE620C7, 0xE720C7, 0xE7C720, 0xE8C7E4, 0xE8E620, 0xE920C7, 0xEA20C7, 0xEA20E5, 0xEA20E8, 0xEAC920, 0xEAD120, 0xEAE620
|
||||
];
|
||||
|
||||
this.getName = function(det) {
|
||||
return "ISO-8859-6";
|
||||
};
|
||||
|
||||
this.getLanguage = function() {
|
||||
return "ar";
|
||||
};
|
||||
};
|
||||
util.inherits(module.exports.ISO_8859_6, sbcs);
|
||||
|
||||
|
||||
module.exports.ISO_8859_7 = function() {
|
||||
this.byteMap = [
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
|
||||
0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F,
|
||||
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
|
||||
0x78, 0x79, 0x7A, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
|
||||
0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F,
|
||||
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
|
||||
0x78, 0x79, 0x7A, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0xA1, 0xA2, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
|
||||
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0xDC, 0x20,
|
||||
0xDD, 0xDE, 0xDF, 0x20, 0xFC, 0x20, 0xFD, 0xFE,
|
||||
0xC0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7,
|
||||
0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF,
|
||||
0xF0, 0xF1, 0x20, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7,
|
||||
0xF8, 0xF9, 0xFA, 0xFB, 0xDC, 0xDD, 0xDE, 0xDF,
|
||||
0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7,
|
||||
0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF,
|
||||
0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7,
|
||||
0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0x20
|
||||
];
|
||||
|
||||
this.ngrams = [
|
||||
0x20E1ED, 0x20E1F0, 0x20E3E9, 0x20E4E9, 0x20E5F0, 0x20E720, 0x20EAE1, 0x20ECE5, 0x20EDE1, 0x20EF20, 0x20F0E1, 0x20F0EF, 0x20F0F1, 0x20F3F4, 0x20F3F5, 0x20F4E7,
|
||||
0x20F4EF, 0xDFE120, 0xE120E1, 0xE120F4, 0xE1E920, 0xE1ED20, 0xE1F0FC, 0xE1F220, 0xE3E9E1, 0xE5E920, 0xE5F220, 0xE720F4, 0xE7ED20, 0xE7F220, 0xE920F4, 0xE9E120,
|
||||
0xE9EADE, 0xE9F220, 0xEAE1E9, 0xEAE1F4, 0xECE520, 0xED20E1, 0xED20E5, 0xED20F0, 0xEDE120, 0xEFF220, 0xEFF520, 0xF0EFF5, 0xF0F1EF, 0xF0FC20, 0xF220E1, 0xF220E5,
|
||||
0xF220EA, 0xF220F0, 0xF220F4, 0xF3E520, 0xF3E720, 0xF3F4EF, 0xF4E120, 0xF4E1E9, 0xF4E7ED, 0xF4E7F2, 0xF4E9EA, 0xF4EF20, 0xF4EFF5, 0xF4F9ED, 0xF9ED20, 0xFEED20
|
||||
];
|
||||
|
||||
this.getName = function(det) {
|
||||
if (typeof det == 'undefined')
|
||||
return "ISO-8859-7";
|
||||
return det.fC1Bytes ? "windows-1253" : "ISO-8859-7";
|
||||
};
|
||||
|
||||
this.getLanguage = function() {
|
||||
return "el";
|
||||
};
|
||||
};
|
||||
util.inherits(module.exports.ISO_8859_7, sbcs);
|
||||
|
||||
|
||||
|
||||
|
|
@ -0,0 +1,106 @@
|
|||
var util = require('util'),
|
||||
Match = require ('../match');
|
||||
|
||||
/**
|
||||
* This class matches UTF-16 and UTF-32, both big- and little-endian. The
|
||||
* BOM will be used if it is present.
|
||||
*/
|
||||
|
||||
module.exports.UTF_16BE = function() {
|
||||
this.name = "UTF-16BE";
|
||||
this.match = function(det) {
|
||||
var input = det.fRawInput;
|
||||
|
||||
if (input.length>=2 && ((input[0] & 0xFF) == 0xFE && (input[1] & 0xFF) == 0xFF)) {
|
||||
var confidence = 100;
|
||||
return new Match(det, this, confidence);
|
||||
}
|
||||
|
||||
// TODO: Do some statistics to check for unsigned UTF-16BE
|
||||
return null;
|
||||
}
|
||||
};
|
||||
|
||||
module.exports.UTF_16LE = function() {
|
||||
this.name = "UTF-16LE";
|
||||
this.match = function(det) {
|
||||
var input = det.fRawInput;
|
||||
|
||||
if (input.length >= 2 && ((input[0] & 0xFF) == 0xFF && (input[1] & 0xFF) == 0xFE)) {
|
||||
// An LE BOM is present.
|
||||
if (input.length>=4 && input[2] == 0x00 && input[3] == 0x00) {
|
||||
// It is probably UTF-32 LE, not UTF-16
|
||||
return null;
|
||||
}
|
||||
var confidence = 100;
|
||||
return new Match(det, this, confidence);
|
||||
}
|
||||
|
||||
// TODO: Do some statistics to check for unsigned UTF-16LE
|
||||
return null;
|
||||
}
|
||||
};
|
||||
|
||||
function UTF_32() {};
|
||||
UTF_32.prototype.match = function(det) {
|
||||
var input = det.fRawInput,
|
||||
limit = (det.fRawLength / 4) * 4,
|
||||
numValid = 0,
|
||||
numInvalid = 0,
|
||||
hasBOM = false,
|
||||
confidence = 0;
|
||||
|
||||
if (limit==0) {
|
||||
return null;
|
||||
}
|
||||
|
||||
if (this.getChar(input, 0) == 0x0000FEFF) {
|
||||
hasBOM = true;
|
||||
}
|
||||
|
||||
for(var i = 0; i < limit; i += 4) {
|
||||
var ch = this.getChar(input, i);
|
||||
|
||||
if (ch < 0 || ch >= 0x10FFFF || (ch >= 0xD800 && ch <= 0xDFFF)) {
|
||||
numInvalid += 1;
|
||||
} else {
|
||||
numValid += 1;
|
||||
}
|
||||
}
|
||||
|
||||
// Cook up some sort of confidence score, based on presence of a BOM
|
||||
// and the existence of valid and/or invalid multi-byte sequences.
|
||||
if (hasBOM && numInvalid==0) {
|
||||
confidence = 100;
|
||||
} else if (hasBOM && numValid > numInvalid*10) {
|
||||
confidence = 80;
|
||||
} else if (numValid > 3 && numInvalid == 0) {
|
||||
confidence = 100;
|
||||
} else if (numValid > 0 && numInvalid == 0) {
|
||||
confidence = 80;
|
||||
} else if (numValid > numInvalid*10) {
|
||||
// Probably corrupt UTF-32BE data. Valid sequences aren't likely by chance.
|
||||
confidence = 25;
|
||||
}
|
||||
|
||||
// return confidence == 0 ? null : new CharsetMatch(det, this, confidence);
|
||||
return confidence == 0 ? null : new Match(det, this, confidence);
|
||||
};
|
||||
|
||||
module.exports.UTF_32BE = function() {
|
||||
this.name = "UTF_32BE";
|
||||
this.getChar = function(input, index) {
|
||||
return (input[index + 0] & 0xFF) << 24 | (input[index + 1] & 0xFF) << 16 |
|
||||
(input[index + 2] & 0xFF) << 8 | (input[index + 3] & 0xFF);
|
||||
};
|
||||
};
|
||||
util.inherits(module.exports.UTF_32BE, UTF_32);
|
||||
|
||||
module.exports.UTF_32LE = function() {
|
||||
this.name = "UTF_32LE";
|
||||
this.getChar = function(input, index) {
|
||||
return (input[index + 3] & 0xFF) << 24 | (input[index + 2] & 0xFF) << 16 |
|
||||
(input[index + 1] & 0xFF) << 8 | (input[index + 0] & 0xFF);
|
||||
};
|
||||
};
|
||||
util.inherits(module.exports.UTF_32LE, UTF_32);
|
||||
|
|
@ -0,0 +1,84 @@
|
|||
|
||||
var Match = require ('../match');
|
||||
|
||||
/**
|
||||
* Charset recognizer for UTF-8
|
||||
*/
|
||||
module.exports = function() {
|
||||
this.name = "UTF-8";
|
||||
this.match = function(det) {
|
||||
|
||||
var hasBOM = false,
|
||||
numValid = 0,
|
||||
numInvalid = 0,
|
||||
input = det.fRawInput,
|
||||
i,
|
||||
trailBytes = 0,
|
||||
confidence;
|
||||
|
||||
if (det.fRawLength >= 3 &&
|
||||
(input[0] & 0xFF) == 0xef && (input[1] & 0xFF) == 0xbb && (input[2] & 0xFF) == 0xbf) {
|
||||
hasBOM = true;
|
||||
}
|
||||
|
||||
// Scan for multi-byte sequences
|
||||
for (i=0; i<det.fRawLength; i++) {
|
||||
var b = input[i];
|
||||
if ((b & 0x80) == 0) {
|
||||
continue; // ASCII
|
||||
}
|
||||
|
||||
// Hi bit on char found. Figure out how long the sequence should be
|
||||
if ((b & 0x0e0) == 0x0c0) {
|
||||
trailBytes = 1;
|
||||
} else if ((b & 0x0f0) == 0x0e0) {
|
||||
trailBytes = 2;
|
||||
} else if ((b & 0x0f8) == 0xf0) {
|
||||
trailBytes = 3;
|
||||
} else {
|
||||
numInvalid++;
|
||||
if (numInvalid > 5) {
|
||||
break;
|
||||
}
|
||||
trailBytes = 0;
|
||||
}
|
||||
|
||||
// Verify that we've got the right number of trail bytes in the sequence
|
||||
for (;;) {
|
||||
i++;
|
||||
if (i>=det.fRawLength) {
|
||||
break;
|
||||
}
|
||||
b = input[i];
|
||||
if ((b & 0xc0) != 0x080) {
|
||||
numInvalid++;
|
||||
break;
|
||||
}
|
||||
if (--trailBytes == 0) {
|
||||
numValid++;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Cook up some sort of confidence score, based on presense of a BOM
|
||||
// and the existence of valid and/or invalid multi-byte sequences.
|
||||
confidence = 0;
|
||||
if (hasBOM && numInvalid==0) {
|
||||
confidence = 100;
|
||||
} else if (hasBOM && numValid > numInvalid*10) {
|
||||
confidence = 80;
|
||||
} else if (numValid > 3 && numInvalid == 0) {
|
||||
confidence = 100;
|
||||
} else if (numValid > 0 && numInvalid == 0) {
|
||||
confidence = 80;
|
||||
} else if (numValid == 0 && numInvalid == 0) {
|
||||
// Plain ASCII.
|
||||
confidence = 10;
|
||||
} else if (numValid > numInvalid*10) {
|
||||
// Probably corruput utf-8 data. Valid sequences aren't likely by chance.
|
||||
confidence = 25;
|
||||
}
|
||||
return confidence == 0 ? null : new Match(det, this, confidence);
|
||||
};
|
||||
};
|
||||
Loading…
Reference in New Issue