/*
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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 "ZXDataMatrixSymbolInfo.h"
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@interface ZXDataMatrixEncoderContext ()
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@property (nonatomic, strong) ZXDimension *maxSize;
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@property (nonatomic, strong) ZXDimension *minSize;
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@end
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@implementation ZXDataMatrixEncoderContext
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- (id)initWithMessage:(NSString *)msg {
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if (self = [super init]) {
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//From this point on Strings are not Unicode anymore!
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NSData *msgData = [msg dataUsingEncoding:NSISOLatin1StringEncoding];
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if (!msgData) {
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[NSException raise:NSInvalidArgumentException format:@"Message contains characters outside ISO-8859-1 encoding."];
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}
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const char *msgBinary = [msgData bytes];
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NSMutableString *sb = [NSMutableString string];
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for (int i = 0, c = (int)msg.length; i < c; i++) {
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unichar ch = (unichar) (msgBinary[i] & 0xff);
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[sb appendFormat:@"%C", ch];
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}
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_message = [[NSString alloc] initWithString:sb];
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_symbolShape = ZXDataMatrixSymbolShapeHintForceNone;
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_codewords = [[NSMutableString alloc] initWithCapacity:msg.length];
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_newEncoding = -1;
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}
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return self;
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}
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- (void)setSizeConstraints:(ZXDimension *)minSize maxSize:(ZXDimension *)maxSize {
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self.minSize = minSize;
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self.maxSize = maxSize;
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}
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- (unichar)currentChar {
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return [self.message characterAtIndex:self.pos];
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}
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- (unichar)current {
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return [self.message characterAtIndex:self.pos];
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}
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- (void)writeCodewords:(NSString *)codewords {
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[self.codewords appendString:codewords];
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}
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- (void)writeCodeword:(unichar)codeword {
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[self.codewords appendFormat:@"%C", codeword];
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}
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- (int)codewordCount {
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return (int)self.codewords.length;
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}
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- (void)signalEncoderChange:(int)encoding {
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self.newEncoding = encoding;
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}
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- (void)resetEncoderSignal {
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self.newEncoding = -1;
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}
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- (BOOL)hasMoreCharacters {
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return self.pos < [self totalMessageCharCount];
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}
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- (int)totalMessageCharCount {
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return (int)self.message.length - self.skipAtEnd;
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}
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- (int)remainingCharacters {
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return [self totalMessageCharCount] - self.pos;
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}
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- (void)updateSymbolInfo {
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[self updateSymbolInfoWithLength:[self codewordCount]];
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}
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- (void)updateSymbolInfoWithLength:(int)len {
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if (self.symbolInfo == nil || len > self.symbolInfo.dataCapacity) {
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self.symbolInfo = [ZXDataMatrixSymbolInfo lookup:len shape:self.symbolShape minSize:self.minSize maxSize:self.maxSize fail:YES];
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}
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}
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- (void)resetSymbolInfo {
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self.symbolInfo = nil;
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}
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@end
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