From 2b9b07dbcbe07a1876adfc76ff06bfbd5305bc2b Mon Sep 17 00:00:00 2001
From: Daniel Cohen Gindi <danielgindi@gmail.com>
Date: Tue, 1 Feb 2022 19:53:38 +0200
Subject: [PATCH] Corrected "TypeError: Cannot assign to read only property",
 closes #68

---
 src/eucjpprober.js       | 5 +++--
 src/mbcharsetprober.js   | 8 +++-----
 src/sjisprober.js        | 4 ++--
 src/universaldetector.js | 6 +++---
 4 files changed, 11 insertions(+), 12 deletions(-)

diff --git a/src/eucjpprober.js b/src/eucjpprober.js
index e978878..45cf4c2 100644
--- a/src/eucjpprober.js
+++ b/src/eucjpprober.js
@@ -71,8 +71,9 @@ function EUCJPProber() {
                 var charLen = this._mCodingSM.getCurrentCharLen();
                 if( i == 0 ) {
                     this._mLastChar[1] = aBuf[0];
-                    this._mContextAnalyzer.feed(this._mLastChar, charLen);
-                    this._mDistributionAnalyzer.feed(this._mLastChar, charLen);
+                    var lastCharStr = this._mLastChar.join('');
+                    this._mContextAnalyzer.feed(lastCharStr, charLen);
+                    this._mDistributionAnalyzer.feed(lastCharStr, charLen);
                 } else {
                     this._mContextAnalyzer.feed(aBuf.slice(i-1,i+1), charLen);
                     this._mDistributionAnalyzer.feed(aBuf.slice(i-1,i+1), charLen);
diff --git a/src/mbcharsetprober.js b/src/mbcharsetprober.js
index c03719b..7c2ec7a 100644
--- a/src/mbcharsetprober.js
+++ b/src/mbcharsetprober.js
@@ -39,8 +39,7 @@ var logger = require('./logger');
     function init() {
         self._mDistributionAnalyzer = null;
         self._mCodingSM = null;
-        //self._mLastChar = ["\x00", "\x00"];
-        self._mLastChar = "\x00\x00";
+        self._mLastChar = ["\x00", "\x00"];
     }
 
     this.reset = function() {
@@ -51,8 +50,7 @@ var logger = require('./logger');
         if( this._mDistributionAnalyzer ) {
             this._mDistributionAnalyzer.reset();
         }
-        //this._mLastChar = ["\x00", "\x00"];
-        this._mLastChar = "\x00\x00";
+        this._mLastChar = ["\x00", "\x00"];
     }
 
     this.getCharsetName = function() {
@@ -73,7 +71,7 @@ var logger = require('./logger');
                 var charLen = this._mCodingSM.getCurrentCharLen();
                 if( i == 0 ) {
                     this._mLastChar[1] = aBuf[0];
-                    this._mDistributionAnalyzer.feed(this._mLastChar, charLen);
+                    this._mDistributionAnalyzer.feed(this._mLastChar.join(''), charLen);
                 } else {
                     this._mDistributionAnalyzer.feed(aBuf.slice(i-1,i+1), charLen);
                 }
diff --git a/src/sjisprober.js b/src/sjisprober.js
index 3160a66..4248fa2 100644
--- a/src/sjisprober.js
+++ b/src/sjisprober.js
@@ -71,8 +71,8 @@ function SJISProber() {
                 var charLen = this._mCodingSM.getCurrentCharLen();
                 if( i == 0 ) {
                     this._mLastChar[1] = aBuf[0];
-                    this._mContextAnalyzer.feed(this._mLastChar.slice(2 - charLen), charLen);
-                    this._mDistributionAnalyzer.feed(this._mLastChar, charLen);
+                    this._mContextAnalyzer.feed(this._mLastChar.slice(2 - charLen).join(''), charLen);
+                    this._mDistributionAnalyzer.feed(this._mLastChar.join(''), charLen);
                 } else {
                     this._mContextAnalyzer.feed(aBuf.slice(i + 1 - charLen, i + 3 - charLen), charLen);
                     this._mDistributionAnalyzer.feed(aBuf.slice(i - 1, i + 1), charLen);
diff --git a/src/universaldetector.js b/src/universaldetector.js
index c335591..8f51d22 100644
--- a/src/universaldetector.js
+++ b/src/universaldetector.js
@@ -108,7 +108,7 @@ function UniversalDetector(options) {
         this._mStart = true;
         this._mGotData = false;
         this._mInputState = _state.pureAscii;
-        this._mLastChar = "";
+        this._mLastChar = [];
         this._mBOM = "";
         if( this._mEscCharsetProber ) {
             this._mEscCharsetProber.reset();
@@ -169,12 +169,12 @@ function UniversalDetector(options) {
         if( this._mInputState == _state.pureAscii ) {
             if( this._highBitDetector.test(aBuf) ) {
                 this._mInputState = _state.highbyte;
-            } else if( this._escDetector.test(this._mLastChar + aBuf) ) {
+            } else if( this._escDetector.test(this._mLastChar.join('') + aBuf) ) {
                 this._mInputState = _state.escAscii;
             }
         }
 
-        this._mLastChar = aBuf.slice(-1);
+        this._mLastChar = aBuf.slice(-1).split('');
 
         if( this._mInputState == _state.escAscii ) {
             if( !this._mEscCharsetProber ) {