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// Copyright 2014 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
// Original code is licensed as follows:
/*
* Copyright 2006-2007 Jeremias Maerki.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "fxbarcode/datamatrix/BC_ASCIIEncoder.h"
#include "fxbarcode/datamatrix/BC_Encoder.h"
#include "fxbarcode/datamatrix/BC_EncoderContext.h"
#include "fxbarcode/datamatrix/BC_HighLevelEncoder.h"
#include "fxbarcode/datamatrix/BC_SymbolInfo.h"
#include "fxbarcode/utils.h"
#include "third_party/base/optional.h"
namespace {
Optional<wchar_t> EncodeASCIIDigits(wchar_t digit1, wchar_t digit2) {
if (!CBC_HighLevelEncoder::isDigit(digit1) ||
!CBC_HighLevelEncoder::isDigit(digit2)) {
// This could potentially return 0 as a sentinel value. Then this function
// can just return wchar_t instead of Optional<wchar_t>.
return {};
}
return static_cast<wchar_t>((digit1 - 48) * 10 + (digit2 - 48) + 130);
}
} // namespace
CBC_ASCIIEncoder::CBC_ASCIIEncoder() {}
CBC_ASCIIEncoder::~CBC_ASCIIEncoder() {}
int32_t CBC_ASCIIEncoder::getEncodingMode() {
return ASCII_ENCODATION;
}
void CBC_ASCIIEncoder::Encode(CBC_EncoderContext& context, int32_t& e) {
int32_t n = CBC_HighLevelEncoder::determineConsecutiveDigitCount(
context.m_msg, context.m_pos);
if (n >= 2) {
Optional<wchar_t> code = EncodeASCIIDigits(
context.m_msg[context.m_pos], context.m_msg[context.m_pos + 1]);
if (!code) {
e = BCExceptionGeneric;
return;
}
context.writeCodeword(*code);
context.m_pos += 2;
return;
}
wchar_t c = context.getCurrentChar();
int32_t newMode = CBC_HighLevelEncoder::lookAheadTest(
context.m_msg, context.m_pos, getEncodingMode());
if (newMode != getEncodingMode()) {
switch (newMode) {
case BASE256_ENCODATION:
context.writeCodeword(CBC_HighLevelEncoder::LATCH_TO_BASE256);
context.signalEncoderChange(BASE256_ENCODATION);
return;
case C40_ENCODATION:
context.writeCodeword(CBC_HighLevelEncoder::LATCH_TO_C40);
context.signalEncoderChange(C40_ENCODATION);
return;
case X12_ENCODATION:
context.writeCodeword(CBC_HighLevelEncoder::LATCH_TO_ANSIX12);
context.signalEncoderChange(X12_ENCODATION);
return;
case TEXT_ENCODATION:
context.writeCodeword(CBC_HighLevelEncoder::LATCH_TO_TEXT);
context.signalEncoderChange(TEXT_ENCODATION);
return;
case EDIFACT_ENCODATION:
context.writeCodeword(CBC_HighLevelEncoder::LATCH_TO_EDIFACT);
context.signalEncoderChange(EDIFACT_ENCODATION);
return;
default:
e = BCExceptionGeneric;
return;
}
}
if (CBC_HighLevelEncoder::isExtendedASCII(c)) {
context.writeCodeword(CBC_HighLevelEncoder::UPPER_SHIFT);
context.writeCodeword(static_cast<wchar_t>(c - 128 + 1));
} else {
context.writeCodeword(static_cast<wchar_t>(c + 1));
}
context.m_pos++;
}
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