// 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 EncodeToEdifactCodewords(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 = EncodeToEdifactCodewords(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 = EncodeToEdifactCodewords(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; }