/*
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* Copyright 2013 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#import "ZXDataMatrixEncoderContext.h"
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#import "ZXDataMatrixHighLevelEncoder.h"
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#import "ZXDataMatrixSymbolInfo.h"
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#import "ZXDataMatrixX12Encoder.h"
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@implementation ZXDataMatrixX12Encoder
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- (int)encodingMode {
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return [ZXDataMatrixHighLevelEncoder x12Encodation];
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}
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- (void)encode:(ZXDataMatrixEncoderContext *)context {
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//step C
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NSMutableString *buffer = [NSMutableString string];
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while ([context hasMoreCharacters]) {
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unichar c = [context currentChar];
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context.pos++;
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[self encodeChar:c buffer:buffer];
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NSUInteger count = buffer.length;
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if ((count % 3) == 0) {
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[self writeNextTriplet:context buffer:buffer];
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int newMode = [ZXDataMatrixHighLevelEncoder lookAheadTest:context.message startpos:context.pos currentMode:[self encodingMode]];
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if (newMode != [self encodingMode]) {
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[context signalEncoderChange:newMode];
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break;
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}
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}
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}
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[self handleEOD:context buffer:buffer];
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}
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- (int)encodeChar:(unichar)c buffer:(NSMutableString *)sb {
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if (c == '\r') {
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[sb appendString:@"\0"];
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} else if (c == '*') {
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[sb appendString:@"\1"];
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} else if (c == '>') {
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[sb appendString:@"\2"];
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} else if (c == ' ') {
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[sb appendString:@"\3"];
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} else if (c >= '0' && c <= '9') {
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[sb appendFormat:@"%C", (unichar) (c - 48 + 4)];
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} else if (c >= 'A' && c <= 'Z') {
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[sb appendFormat:@"%C", (unichar) (c - 65 + 14)];
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} else {
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[ZXDataMatrixHighLevelEncoder illegalCharacter:c];
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}
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return 1;
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}
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- (void)handleEOD:(ZXDataMatrixEncoderContext *)context buffer:(NSMutableString *)buffer {
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[context updateSymbolInfo];
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int available = context.symbolInfo.dataCapacity - [context codewordCount];
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int count = (int)buffer.length;
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context.pos -= count;
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if (context.remainingCharacters > 1 || available > 1 ||
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context.remainingCharacters != available) {
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[context writeCodeword:[ZXDataMatrixHighLevelEncoder x12Unlatch]];
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}
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if (context.newEncoding < 0) {
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[context signalEncoderChange:[ZXDataMatrixHighLevelEncoder asciiEncodation]];
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}
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}
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@end
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