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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_Base256Encoder.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"
namespace {
wchar_t Randomize255State(wchar_t ch, int32_t position) {
int32_t pseudoRandom = ((149 * position) % 255) + 1;
int32_t tempVariable = ch + pseudoRandom;
if (tempVariable <= 255)
return static_cast<wchar_t>(tempVariable);
return static_cast<wchar_t>(tempVariable - 256);
}
} // namespace
CBC_Base256Encoder::CBC_Base256Encoder() = default;
CBC_Base256Encoder::~CBC_Base256Encoder() = default;
CBC_HighLevelEncoder::Encoding CBC_Base256Encoder::GetEncodingMode() {
return CBC_HighLevelEncoder::Encoding::BASE256;
}
bool CBC_Base256Encoder::Encode(CBC_EncoderContext* context) {
WideString buffer;
buffer.Reserve(context->getRemainingCharacters() + 1);
buffer += L'\0';
while (context->hasMoreCharacters()) {
wchar_t c = context->getCurrentChar();
buffer += c;
context->m_pos++;
CBC_HighLevelEncoder::Encoding newMode =
CBC_HighLevelEncoder::LookAheadTest(context->m_msg, context->m_pos,
GetEncodingMode());
if (newMode != GetEncodingMode()) {
context->SignalEncoderChange(newMode);
break;
}
}
size_t dataCount = buffer.GetLength() - 1;
char buf[128];
FXSYS_itoa(dataCount, buf, 10);
buffer.SetAt(0, static_cast<wchar_t>(*buf) - '0');
int32_t lengthFieldSize = 1;
int32_t currentSize =
context->getCodewordCount() + dataCount + lengthFieldSize;
if (!context->UpdateSymbolInfo(currentSize))
return false;
bool mustPad = (context->m_symbolInfo->data_capacity() - currentSize) > 0;
if (context->hasMoreCharacters() || mustPad) {
if (dataCount <= 249) {
buffer.SetAt(0, static_cast<wchar_t>(dataCount));
} else if (dataCount > 249 && dataCount <= 1555) {
buffer.SetAt(0, static_cast<wchar_t>((dataCount / 250) + 249));
buffer.Insert(1, static_cast<wchar_t>(dataCount % 250));
} else {
return false;
}
}
for (const auto& c : buffer) {
context->writeCodeword(
Randomize255State(c, context->getCodewordCount() + 1));
}
return true;
}