| // 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; |
| } |