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Added EAN-8 Reader

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This commit is contained in:
Christoph Oberhofer
2015-04-26 21:34:31 +02:00
parent 19aaeefc60
commit 5bf9add381
12 changed files with 221 additions and 77 deletions
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src/barcode_decoder.js
+19 -1
View File
@@ -1,12 +1,30 @@
/* jshint undef: true, unused: true, browser:true, devel: true */
/* global define */
define(["bresenham", "image_debug", 'code_128_reader', 'ean_reader', 'code_39_reader', 'codabar_reader', 'upc_reader'], function(Bresenham, ImageDebug, Code128Reader, EANReader, Code39Reader, CodabarReader, UPCReader) {
define([
"bresenham",
"image_debug",
'code_128_reader',
'ean_reader',
'code_39_reader',
'codabar_reader',
'upc_reader',
'ean_8_reader'
], function(
Bresenham,
ImageDebug,
Code128Reader,
EANReader,
Code39Reader,
CodabarReader,
UPCReader,
EAN8Reader) {
"use strict";
var readers = {
code_128_reader: Code128Reader,
ean_reader: EANReader,
ean_8_reader: EAN8Reader,
code_39_reader: Code39Reader,
codabar_reader: CodabarReader,
upc_reader: UPCReader
src/ean_8_reader.js
+45
View File
@@ -0,0 +1,45 @@
/* jshint undef: true, unused: true, browser:true, devel: true */
/* global define */
define(
[
"./ean_reader"
],
function(EANReader) {
"use strict";
function EAN8Reader() {
EANReader.call(this);
}
EAN8Reader.prototype = Object.create(EANReader.prototype);
EAN8Reader.prototype.constructor = EAN8Reader;
EAN8Reader.prototype._decodePayload = function(code, result, decodedCodes) {
var i,
self = this;
for ( i = 0; i < 4; i++) {
code = self._decodeCode(code.end);
result.push(code.code);
decodedCodes.push(code);
}
code = self._findPattern(self.MIDDLE_PATTERN, code.end, true);
if (code === null) {
return null;
}
decodedCodes.push(code);
for ( i = 0; i < 4; i++) {
code = self._decodeCode(code.end, self.CODE_G_START);
decodedCodes.push(code);
result.push(code.code);
}
return code;
};
return (EAN8Reader);
}
);
src/ean_reader.js
+40 -33
View File
@@ -200,13 +200,50 @@ define(
return null;
};
EANReader.prototype._decodePayload = function(code, result, decodedCodes) {
var i,
self = this,
codeFrequency = 0x0;
for ( i = 0; i < 6; i++) {
code = self._decodeCode(code.end);
if (code.code >= self.CODE_G_START) {
code.code = code.code - self.CODE_G_START;
codeFrequency |= 1 << (5 - i);
} else {
codeFrequency |= 0 << (5 - i);
}
result.push(code.code);
decodedCodes.push(code);
}
for ( i = 0; i < self.CODE_FREQUENCY.length; i++) {
if (codeFrequency === self.CODE_FREQUENCY[i]) {
result.unshift(i);
break;
}
}
code = self._findPattern(self.MIDDLE_PATTERN, code.end, true);
if (code === null) {
return null;
}
decodedCodes.push(code);
for ( i = 0; i < 6; i++) {
code = self._decodeCode(code.end, self.CODE_G_START);
decodedCodes.push(code);
result.push(code.code);
}
return code;
};
EANReader.prototype._decode = function() {
var startInfo,
self = this,
code = null,
result = [],
i,
codeFrequency = 0x0,
decodedCodes = [];
try {
@@ -217,37 +254,7 @@ define(
end : startInfo.end
};
decodedCodes.push(code);
for ( i = 0; i < 6; i++) {
code = self._decodeCode(code.end);
if (code.code >= self.CODE_G_START) {
code.code = code.code - self.CODE_G_START;
codeFrequency |= 1 << (5 - i);
} else {
codeFrequency |= 0 << (5 - i);
}
result.push(code.code);
decodedCodes.push(code);
}
for ( i = 0; i < self.CODE_FREQUENCY.length; i++) {
if (codeFrequency === self.CODE_FREQUENCY[i]) {
result.unshift(i);
break;
}
}
code = self._findPattern(self.MIDDLE_PATTERN, code.end, true);
if (code === null) {
return null;
}
decodedCodes.push(code);
for ( i = 0; i < 6; i++) {
code = self._decodeCode(code.end, self.CODE_G_START);
decodedCodes.push(code);
result.push(code.code);
}
code = self._decodePayload(code, result, decodedCodes);
code = self._findEnd(code.end);
if (code === null){
return null;