@zxing/library
Version:
TypeScript port of ZXing multi-format 1D/2D barcode image processing library.
62 lines (61 loc) • 2.7 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.Base256Encoder = void 0;
var StringUtils_1 = require("../../common/StringUtils");
var StringBuilder_1 = require("../../util/StringBuilder");
var HighLevelEncoder_1 = require("./HighLevelEncoder");
var constants_1 = require("./constants");
var Base256Encoder = /** @class */ (function () {
function Base256Encoder() {
}
Base256Encoder.prototype.getEncodingMode = function () {
return constants_1.BASE256_ENCODATION;
};
Base256Encoder.prototype.encode = function (context) {
var buffer = new StringBuilder_1.default();
buffer.append(0); // Initialize length field
while (context.hasMoreCharacters()) {
var c = context.getCurrentChar();
buffer.append(c);
context.pos++;
var newMode = HighLevelEncoder_1.default.lookAheadTest(context.getMessage(), context.pos, this.getEncodingMode());
if (newMode !== this.getEncodingMode()) {
// Return to ASCII encodation, which will actually handle latch to new mode
context.signalEncoderChange(constants_1.ASCII_ENCODATION);
break;
}
}
var dataCount = buffer.length() - 1;
var lengthFieldSize = 1;
var currentSize = context.getCodewordCount() + dataCount + lengthFieldSize;
context.updateSymbolInfo(currentSize);
var mustPad = context.getSymbolInfo().getDataCapacity() - currentSize > 0;
if (context.hasMoreCharacters() || mustPad) {
if (dataCount <= 249) {
buffer.setCharAt(0, StringUtils_1.default.getCharAt(dataCount));
}
else if (dataCount <= 1555) {
buffer.setCharAt(0, StringUtils_1.default.getCharAt(Math.floor(dataCount / 250) + 249));
buffer.insert(1, StringUtils_1.default.getCharAt(dataCount % 250));
}
else {
throw new Error('Message length not in valid ranges: ' + dataCount);
}
}
for (var i = 0, c = buffer.length(); i < c; i++) {
context.writeCodeword(this.randomize255State(buffer.charAt(i).charCodeAt(0), context.getCodewordCount() + 1));
}
};
Base256Encoder.prototype.randomize255State = function (ch, codewordPosition) {
var pseudoRandom = ((149 * codewordPosition) % 255) + 1;
var tempVariable = ch + pseudoRandom;
if (tempVariable <= 255) {
return tempVariable;
}
else {
return tempVariable - 256;
}
};
return Base256Encoder;
}());
exports.Base256Encoder = Base256Encoder;