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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_C40Encoder.h"
#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) {
wchar_t c1 = sb[startPos];
wchar_t c2 = sb[startPos + 1];
wchar_t c3 = sb[startPos + 2];
int32_t v = (1600 * c1) + (40 * c2) + c3 + 1;
wchar_t cw[2];
cw[0] = static_cast<wchar_t>(v / 256);
cw[1] = static_cast<wchar_t>(v % 256);
return WideString(cw, FX_ArraySize(cw));
}
} // namespace
CBC_C40Encoder::CBC_C40Encoder() {}
CBC_C40Encoder::~CBC_C40Encoder() {}
int32_t CBC_C40Encoder::getEncodingMode() {
return C40_ENCODATION;
}
void CBC_C40Encoder::Encode(CBC_EncoderContext& context, int32_t& e) {
WideString buffer;
while (context.hasMoreCharacters()) {
wchar_t c = context.getCurrentChar();
context.m_pos++;
int32_t lastCharSize = encodeChar(c, buffer, e);
if (e != BCExceptionNO) {
return;
}
int32_t unwritten = (buffer.GetLength() / 3) * 2;
int32_t curCodewordCount = context.getCodewordCount() + unwritten;
context.updateSymbolInfo(curCodewordCount, e);
if (e != BCExceptionNO) {
return;
}
int32_t available = context.m_symbolInfo->dataCapacity() - curCodewordCount;
if (!context.hasMoreCharacters()) {
if ((buffer.GetLength() % 3) == 2) {
if (available < 2 || available > 2) {
lastCharSize = BacktrackOneCharacter(&context, &buffer, lastCharSize);
if (lastCharSize < 0) {
e = BCExceptionGeneric;
return;
}
}
}
while ((buffer.GetLength() % 3) == 1 &&
((lastCharSize <= 3 && available != 1) || lastCharSize > 3)) {
lastCharSize = BacktrackOneCharacter(&context, &buffer, lastCharSize);
if (lastCharSize < 0) {
e = BCExceptionGeneric;
return;
}
}
break;
}
int32_t count = buffer.GetLength();
if ((count % 3) == 0) {
int32_t newMode = CBC_HighLevelEncoder::lookAheadTest(
context.m_msg, context.m_pos, getEncodingMode());
if (newMode != getEncodingMode()) {
context.signalEncoderChange(newMode);
break;
}
}
}
handleEOD(context, buffer, e);
}
void CBC_C40Encoder::writeNextTriplet(CBC_EncoderContext& context,
WideString& buffer) {
context.writeCodewords(EncodeToCodewords(buffer, 0));
buffer.Delete(0, 3);
}
void CBC_C40Encoder::handleEOD(CBC_EncoderContext& context,
WideString& buffer,
int32_t& e) {
int32_t unwritten = (buffer.GetLength() / 3) * 2;
int32_t rest = buffer.GetLength() % 3;
int32_t curCodewordCount = context.getCodewordCount() + unwritten;
context.updateSymbolInfo(curCodewordCount, e);
if (e != BCExceptionNO) {
return;
}
int32_t available = context.m_symbolInfo->dataCapacity() - curCodewordCount;
if (rest == 2) {
buffer += (wchar_t)'\0';
while (buffer.GetLength() >= 3) {
writeNextTriplet(context, buffer);
}
if (context.hasMoreCharacters()) {
context.writeCodeword(CBC_HighLevelEncoder::C40_UNLATCH);
}
} else if (available == 1 && rest == 1) {
while (buffer.GetLength() >= 3) {
writeNextTriplet(context, buffer);
}
if (context.hasMoreCharacters()) {
context.writeCodeword(CBC_HighLevelEncoder::C40_UNLATCH);
}
context.m_pos--;
} else if (rest == 0) {
while (buffer.GetLength() >= 3) {
writeNextTriplet(context, buffer);
}
if (available > 0 || context.hasMoreCharacters()) {
context.writeCodeword(CBC_HighLevelEncoder::C40_UNLATCH);
}
} else {
e = BCExceptionIllegalStateUnexpectedCase;
return;
}
context.signalEncoderChange(ASCII_ENCODATION);
}
int32_t CBC_C40Encoder::encodeChar(wchar_t c, WideString& sb, int32_t& e) {
if (c == ' ') {
sb += (wchar_t)'\3';
return 1;
} else if ((c >= '0') && (c <= '9')) {
sb += (wchar_t)(c - 48 + 4);
return 1;
} else if ((c >= 'A') && (c <= 'Z')) {
sb += (wchar_t)(c - 65 + 14);
return 1;
} else if (c <= 0x1f) {
sb += (wchar_t)'\0';
sb += c;
return 2;
} else if ((c >= '!') && (c <= '/')) {
sb += (wchar_t)'\1';
sb += (wchar_t)(c - 33);
return 2;
} else if ((c >= ':') && (c <= '@')) {
sb += (wchar_t)'\1';
sb += (wchar_t)(c - 58 + 15);
return 2;
} else if ((c >= '[') && (c <= '_')) {
sb += (wchar_t)'\1';
sb += (wchar_t)(c - 91 + 22);
return 2;
} else if ((c >= 60) && (c <= 0x7f)) {
sb += (wchar_t)'\2';
sb += (wchar_t)(c - 96);
return 2;
} else if (c >= 80) {
sb += (wchar_t)'\1';
sb += (wchar_t)0x001e;
int32_t len = 2;
len += encodeChar((c - 128), sb, e);
if (e != BCExceptionNO)
return 0;
return len;
} else {
e = BCExceptionIllegalArgument;
return 0;
}
}
int32_t CBC_C40Encoder::BacktrackOneCharacter(CBC_EncoderContext* context,
WideString* buffer,
int32_t lastCharSize) {
if (context->m_pos < 1)
return -1;
int32_t count = buffer->GetLength();
if (count < lastCharSize)
return -1;
buffer->Delete(count - lastCharSize, lastCharSize);
context->m_pos--;
wchar_t c = context->getCurrentChar();
int32_t e = BCExceptionNO;
WideString removed;
int32_t len = encodeChar(c, removed, e);
if (e != BCExceptionNO)
return -1;
ASSERT(len > 0);
context->resetSymbolInfo();
return len;
}
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