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116 lines
3.9 KiB
116 lines
3.9 KiB
// Copyright 2014 PDFium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
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// Original code is licensed as follows:
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/*
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* Copyright 2006-2007 Jeremias Maerki.
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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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#include "fxbarcode/datamatrix/BC_ASCIIEncoder.h"
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#include "core/fxcrt/fx_extension.h"
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#include "fxbarcode/datamatrix/BC_Encoder.h"
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#include "fxbarcode/datamatrix/BC_EncoderContext.h"
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#include "fxbarcode/datamatrix/BC_HighLevelEncoder.h"
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#include "fxbarcode/datamatrix/BC_SymbolInfo.h"
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#include "third_party/base/optional.h"
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namespace {
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Optional<wchar_t> EncodeASCIIDigits(wchar_t digit1, wchar_t digit2) {
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if (!FXSYS_IsDecimalDigit(digit1) || !FXSYS_IsDecimalDigit(digit2)) {
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// This could potentially return 0 as a sentinel value. Then this function
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// can just return wchar_t instead of Optional<wchar_t>.
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return {};
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}
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return static_cast<wchar_t>((digit1 - 48) * 10 + (digit2 - 48) + 130);
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}
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size_t DetermineConsecutiveDigitCount(const WideString& msg, size_t startpos) {
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// This is faster in debug builds and helpful for fuzzers.
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// Access |data| with care.
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size_t count = 0;
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const size_t size = msg.GetLength();
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const wchar_t* data = msg.c_str();
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for (size_t i = startpos; i < size; ++i) {
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if (!FXSYS_IsDecimalDigit(data[i]))
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break;
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++count;
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}
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return count;
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}
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} // namespace
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CBC_ASCIIEncoder::CBC_ASCIIEncoder() = default;
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CBC_ASCIIEncoder::~CBC_ASCIIEncoder() = default;
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CBC_HighLevelEncoder::Encoding CBC_ASCIIEncoder::GetEncodingMode() {
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return CBC_HighLevelEncoder::Encoding::ASCII;
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}
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bool CBC_ASCIIEncoder::Encode(CBC_EncoderContext* context) {
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size_t n = DetermineConsecutiveDigitCount(context->m_msg, context->m_pos);
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if (n >= 2) {
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Optional<wchar_t> code = EncodeASCIIDigits(
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context->m_msg[context->m_pos], context->m_msg[context->m_pos + 1]);
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if (!code)
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return false;
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context->writeCodeword(*code);
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context->m_pos += 2;
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return true;
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}
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wchar_t c = context->getCurrentChar();
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CBC_HighLevelEncoder::Encoding newMode = CBC_HighLevelEncoder::LookAheadTest(
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context->m_msg, context->m_pos, GetEncodingMode());
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if (newMode != GetEncodingMode()) {
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switch (newMode) {
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case CBC_HighLevelEncoder::Encoding::BASE256:
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context->writeCodeword(CBC_HighLevelEncoder::LATCH_TO_BASE256);
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break;
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case CBC_HighLevelEncoder::Encoding::C40:
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context->writeCodeword(CBC_HighLevelEncoder::LATCH_TO_C40);
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break;
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case CBC_HighLevelEncoder::Encoding::X12:
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context->writeCodeword(CBC_HighLevelEncoder::LATCH_TO_ANSIX12);
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break;
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case CBC_HighLevelEncoder::Encoding::TEXT:
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context->writeCodeword(CBC_HighLevelEncoder::LATCH_TO_TEXT);
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break;
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case CBC_HighLevelEncoder::Encoding::EDIFACT:
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context->writeCodeword(CBC_HighLevelEncoder::LATCH_TO_EDIFACT);
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break;
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default:
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return false;
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}
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context->SignalEncoderChange(newMode);
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return true;
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}
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if (CBC_HighLevelEncoder::IsExtendedASCII(c)) {
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context->writeCodeword(CBC_HighLevelEncoder::UPPER_SHIFT);
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context->writeCodeword(static_cast<wchar_t>(c - 128 + 1));
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} else {
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context->writeCodeword(static_cast<wchar_t>(c + 1));
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}
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context->m_pos++;
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return true;
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}
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