| // 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 2007 ZXing authors |
| * |
| * 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 "xfa/fxbarcode/qrcode/BC_QRCoderFormatInformation.h" |
| |
| #include <limits> |
| |
| #include "xfa/fxbarcode/qrcode/BC_QRCoderErrorCorrectionLevel.h" |
| #include "xfa/fxbarcode/utils.h" |
| |
| namespace { |
| |
| const uint16_t FORMAT_INFO_MASK_QR = 0X5412; |
| |
| struct DecodeInfo { |
| uint16_t target; |
| uint16_t format; |
| }; |
| const DecodeInfo FORMAT_INFO_DECODE_LOOKUP[32] = { |
| {0x5412, 0x00}, {0x5125, 0x01}, {0x5E7C, 0x02}, {0x5B4B, 0x03}, |
| {0x45F9, 0x04}, {0x40CE, 0x05}, {0x4F97, 0x06}, {0x4AA0, 0x07}, |
| {0x77C4, 0x08}, {0x72F3, 0x09}, {0x7DAA, 0x0A}, {0x789D, 0x0B}, |
| {0x662F, 0x0C}, {0x6318, 0x0D}, {0x6C41, 0x0E}, {0x6976, 0x0F}, |
| {0x1689, 0x10}, {0x13BE, 0x11}, {0x1CE7, 0x12}, {0x19D0, 0x13}, |
| {0x0762, 0x14}, {0x0255, 0x15}, {0x0D0C, 0x16}, {0x083B, 0x17}, |
| {0x355F, 0x18}, {0x3068, 0x19}, {0x3F31, 0x1A}, {0x3A06, 0x1B}, |
| {0x24B4, 0x1C}, {0x2183, 0x1D}, {0x2EDA, 0x1E}, {0x2BED, 0x1F}, |
| }; |
| const uint8_t BITS_SET_IN_HALF_BYTE[] = {0, 1, 1, 2, 1, 2, 2, 3, |
| 1, 2, 2, 3, 2, 3, 3, 4}; |
| |
| CBC_QRCoderFormatInformation* DoDecodeFormatInformation( |
| int32_t maskedFormatInfo) { |
| int32_t bestDifference = std::numeric_limits<int32_t>::max(); |
| int32_t bestFormatInfo = 0; |
| for (int32_t i = 0; i < 32; ++i) { |
| const DecodeInfo& decodeInfo = FORMAT_INFO_DECODE_LOOKUP[i]; |
| if (decodeInfo.target == maskedFormatInfo) |
| return new CBC_QRCoderFormatInformation(decodeInfo.format); |
| |
| int32_t bitsDifference = CBC_QRCoderFormatInformation::NumBitsDiffering( |
| maskedFormatInfo, decodeInfo.target); |
| if (bitsDifference < bestDifference) { |
| bestFormatInfo = decodeInfo.format; |
| bestDifference = bitsDifference; |
| } |
| } |
| if (bestDifference > 3) |
| return nullptr; |
| return new CBC_QRCoderFormatInformation(bestFormatInfo); |
| } |
| |
| } // namespace |
| |
| CBC_QRCoderFormatInformation::CBC_QRCoderFormatInformation(int32_t formatInfo) |
| : m_dataMask(static_cast<uint8_t>(formatInfo & 0x07)) { |
| m_errorCorrectLevel = |
| CBC_QRCoderErrorCorrectionLevel::ForBits((formatInfo >> 3) & 0x03); |
| } |
| |
| CBC_QRCoderFormatInformation::~CBC_QRCoderFormatInformation() {} |
| int32_t CBC_QRCoderFormatInformation::NumBitsDiffering(int32_t a, int32_t b) { |
| a ^= b; |
| return BITS_SET_IN_HALF_BYTE[a & 0x0F] + |
| BITS_SET_IN_HALF_BYTE[(a >> 4) & 0x0F] + |
| BITS_SET_IN_HALF_BYTE[(a >> 8) & 0x0F] + |
| BITS_SET_IN_HALF_BYTE[(a >> 12) & 0x0F] + |
| BITS_SET_IN_HALF_BYTE[(a >> 16) & 0x0F] + |
| BITS_SET_IN_HALF_BYTE[(a >> 20) & 0x0F] + |
| BITS_SET_IN_HALF_BYTE[(a >> 24) & 0x0F] + |
| BITS_SET_IN_HALF_BYTE[(a >> 28) & 0x0F]; |
| } |
| uint8_t CBC_QRCoderFormatInformation::GetDataMask() const { |
| return m_dataMask; |
| } |
| |
| // static |
| CBC_QRCoderErrorCorrectionLevel* |
| CBC_QRCoderFormatInformation::GetErrorCorrectionLevel() { |
| return m_errorCorrectLevel; |
| } |
| |
| // static |
| CBC_QRCoderFormatInformation* |
| CBC_QRCoderFormatInformation::DecodeFormatInformation( |
| int32_t maskedFormatInfo) { |
| CBC_QRCoderFormatInformation* formatInfo = |
| DoDecodeFormatInformation(maskedFormatInfo); |
| if (formatInfo) |
| return formatInfo; |
| return DoDecodeFormatInformation(maskedFormatInfo ^ FORMAT_INFO_MASK_QR); |
| } |