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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_EdifactEncoder.h"
#include <algorithm>
#include "fxbarcode/common/BC_CommonBitMatrix.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"
namespace {
WideString EncodeToCodewords(const WideString& sb, int32_t startPos) {
int32_t len = sb.GetLength() - startPos;
if (len == 0)
return WideString();
wchar_t c1 = sb[startPos];
wchar_t c2 = len >= 2 ? sb[startPos + 1] : 0;
wchar_t c3 = len >= 3 ? sb[startPos + 2] : 0;
wchar_t c4 = len >= 4 ? sb[startPos + 3] : 0;
int32_t v = (c1 << 18) + (c2 << 12) + (c3 << 6) + c4;
constexpr int32_t kBuflen = 3;
wchar_t cw[kBuflen];
cw[0] = static_cast<wchar_t>((v >> 16) & 255);
cw[1] = static_cast<wchar_t>((v >> 8) & 255);
cw[2] = static_cast<wchar_t>(v & 255);
return WideString(cw, std::min(len, kBuflen));
}
bool HandleEOD(CBC_EncoderContext* context, const WideString& buffer) {
int32_t count = buffer.GetLength();
if (count == 0)
return true;
if (count > 4)
return false;
if (count == 1) {
int32_t e = BCExceptionNO;
context->updateSymbolInfo(e);
if (e != BCExceptionNO)
return false;
int32_t available =
context->m_symbolInfo->dataCapacity() - context->getCodewordCount();
int32_t remaining = context->getRemainingCharacters();
if (remaining == 0 && available <= 2)
return true;
}
int32_t restChars = count - 1;
WideString encoded = EncodeToCodewords(buffer, 0);
if (encoded.IsEmpty())
return false;
bool endOfSymbolReached = !context->hasMoreCharacters();
bool restInAscii = endOfSymbolReached && restChars <= 2;
if (restChars <= 2) {
int32_t e = BCExceptionNO;
context->updateSymbolInfo(context->getCodewordCount() + restChars, e);
if (e != BCExceptionNO)
return false;
int32_t available =
context->m_symbolInfo->dataCapacity() - context->getCodewordCount();
if (available >= 3) {
restInAscii = false;
context->updateSymbolInfo(
context->getCodewordCount() + encoded.GetLength(), e);
if (e != BCExceptionNO)
return false;
}
}
if (restInAscii) {
context->resetSymbolInfo();
context->m_pos -= restChars;
} else {
context->writeCodewords(encoded);
}
context->signalEncoderChange(ASCII_ENCODATION);
return true;
}
void encodeChar(wchar_t c, WideString* sb, int32_t& e) {
if (c >= ' ' && c <= '?') {
*sb += c;
} else if (c >= '@' && c <= '^') {
*sb += (wchar_t)(c - 64);
} else {
e = BCExceptionIllegalArgument;
}
}
} // namespace
CBC_EdifactEncoder::CBC_EdifactEncoder() {}
CBC_EdifactEncoder::~CBC_EdifactEncoder() {}
int32_t CBC_EdifactEncoder::getEncodingMode() {
return EDIFACT_ENCODATION;
}
void CBC_EdifactEncoder::Encode(CBC_EncoderContext& context, int32_t& e) {
WideString buffer;
while (context.hasMoreCharacters()) {
wchar_t c = context.getCurrentChar();
encodeChar(c, &buffer, e);
if (e != BCExceptionNO) {
return;
}
context.m_pos++;
int32_t count = buffer.GetLength();
if (count >= 4) {
WideString encoded = EncodeToCodewords(buffer, 0);
if (encoded.IsEmpty()) {
e = BCExceptionGeneric;
return;
}
context.writeCodewords(encoded);
buffer.Delete(0, 4);
int32_t newMode = CBC_HighLevelEncoder::lookAheadTest(
context.m_msg, context.m_pos, getEncodingMode());
if (newMode != getEncodingMode()) {
context.signalEncoderChange(ASCII_ENCODATION);
break;
}
}
}
buffer += static_cast<wchar_t>(31);
if (!HandleEOD(&context, buffer))
e = BCExceptionGeneric;
}
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