Add cp874 support

README.md

@@ -50,7 +50,7 @@ If you don't specify a code page, it will assume you want to print only ASCII ch
         .text('简体中文')
         .encode()
 
-The following code pages are supported: cp437, cp737, cp850, cp775, cp852, cp855, cp857, cp858, cp860, cp861, cp862, cp863, cp864, cp865, cp866, cp869, cp936, cp949, cp950, cp1252, iso88596, shiftjis, windows1250, windows1251, windows1252, windows1253, windows1254, windows1255, windows1256, windows1257, windows1258.
+The following code pages are supported: cp437, cp737, cp850, cp775, cp852, cp855, cp857, cp858, cp860, cp861, cp862, cp863, cp864, cp865, cp866, cp869, cp874, cp936, cp949, cp950, cp1252, iso88596, shiftjis, windows1250, windows1251, windows1252, windows1253, windows1254, windows1255, windows1256, windows1257, windows1258.
 
 ### Text
 

src/esc-pos-encoder.js

@@ -99,6 +99,7 @@ class EscPosEncoder {
       'cp1252': [0x10, false],
       'iso88596': [0x16, false],
       'shiftjis': [0xfc, true],
+      'windows874': [0x1e, false],
       'windows1250': [0x48, false],
       'windows1251': [0x49, false],
       'windows1252': [0x47, false],

test/esc-pos-encoder.js

@@ -50,6 +50,14 @@ describe('EscPosEncoder', function() {
         });
     });
 
+    describe('codepage(cp874).text(กำลังทดสอบ) - thai', function () {
+        let result = encoder.codepage('cp874').text('กำลังทดสอบ').encode();
+
+        it('should be [ 27, 116, 0, 104, 130, 108, 108, 111 ]', function () {
+            assert.deepEqual(new Uint8Array([ 27, 116, 30, 161, 211, 197, 209, 167, 183, 180, 202, 205, 186 ]), result);
+        });
+    });
+
     describe('codepage(cp936).text(简体中文) - simplified chinese', function () {
         let result = encoder.codepage('cp936').text('简体中文').encode();