96 lines
3.1 KiB
C++
96 lines
3.1 KiB
C++
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/*
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* Copyright 2016 Nu-book Inc.
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* Copyright 2016 ZXing authors
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* Copyright 2023 gitlost
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*/
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// SPDX-License-Identifier: Apache-2.0
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#include "QRCodecMode.h"
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#include "Error.h"
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#include "QRVersion.h"
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#include "ZXAlgorithms.h"
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#include <array>
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namespace ZXing::QRCode {
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CodecMode CodecModeForBits(int bits, Type type)
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{
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if (type == Type::Micro) {
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constexpr CodecMode Bits2Mode[4] = {CodecMode::NUMERIC, CodecMode::ALPHANUMERIC, CodecMode::BYTE, CodecMode::KANJI};
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if (bits < Size(Bits2Mode))
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return Bits2Mode[bits];
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} else if (type == Type::rMQR) {
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constexpr CodecMode Bits2Mode[8] = {
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CodecMode::TERMINATOR, CodecMode::NUMERIC, CodecMode::ALPHANUMERIC, CodecMode::BYTE,
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CodecMode::KANJI, CodecMode::FNC1_FIRST_POSITION, CodecMode::FNC1_SECOND_POSITION, CodecMode::ECI
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};
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if (bits < Size(Bits2Mode))
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return Bits2Mode[bits];
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} else {
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if ((bits >= 0x00 && bits <= 0x05) || (bits >= 0x07 && bits <= 0x09) || bits == 0x0d)
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return static_cast<CodecMode>(bits);
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}
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throw FormatError("Invalid codec mode");
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}
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int CharacterCountBits(CodecMode mode, const Version& version)
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{
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int number = version.versionNumber();
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if (version.isMicro()) {
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switch (mode) {
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case CodecMode::NUMERIC: return std::array{3, 4, 5, 6}[number - 1];
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case CodecMode::ALPHANUMERIC: return std::array{3, 4, 5}[number - 2];
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case CodecMode::BYTE: return std::array{4, 5}[number - 3];
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case CodecMode::KANJI: [[fallthrough]];
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case CodecMode::HANZI: return std::array{3, 4}[number - 3];
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default: return 0;
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}
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}
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if (version.isRMQR()) {
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// See ISO/IEC 23941:2022 7.4.1, Table 3 - Number of bits of character count indicator
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constexpr char numeric[32] = {4, 5, 6, 7, 7, 5, 6, 7, 7, 8, 4, 6, 7, 7, 8, 8, 5, 6, 7, 7, 8, 8, 7, 7, 8, 8, 9, 7, 8, 8, 8, 9};
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constexpr char alphanum[32] = {3, 5, 5, 6, 6, 5, 5, 6, 6, 7, 4, 5, 6, 6, 7, 7, 5, 6, 6, 7, 7, 8, 6, 7, 7, 7, 8, 6, 7, 7, 8, 8};
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constexpr char byte[32] = {3, 4, 5, 5, 6, 4, 5, 5, 6, 6, 3, 5, 5, 6, 6, 7, 4, 5, 6, 6, 7, 7, 6, 6, 7, 7, 7, 6, 6, 7, 7, 8};
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constexpr char kanji[32] = {2, 3, 4, 5, 5, 3, 4, 5, 5, 6, 2, 4, 5, 5, 6, 6, 3, 5, 5, 6, 6, 7, 5, 5, 6, 6, 7, 5, 6, 6, 6, 7};
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switch (mode) {
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case CodecMode::NUMERIC: return numeric[number - 1];
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case CodecMode::ALPHANUMERIC: return alphanum[number - 1];
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case CodecMode::BYTE: return byte[number - 1];
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case CodecMode::KANJI: return kanji[number - 1];
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default: return 0;
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}
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}
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int i;
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if (number <= 9)
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i = 0;
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else if (number <= 26)
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i = 1;
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else
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i = 2;
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switch (mode) {
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case CodecMode::NUMERIC: return std::array{10, 12, 14}[i];
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case CodecMode::ALPHANUMERIC: return std::array{9, 11, 13}[i];
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case CodecMode::BYTE: return std::array{8, 16, 16}[i];
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case CodecMode::KANJI: [[fallthrough]];
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case CodecMode::HANZI: return std::array{8, 10, 12}[i];
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default: return 0;
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}
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}
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int CodecModeBitsLength(const Version& version)
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{
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return version.isMicro() ? version.versionNumber() - 1 : 4 - version.isRMQR();
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}
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int TerminatorBitsLength(const Version& version)
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{
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return version.isMicro() ? version.versionNumber() * 2 + 1 : 4 - version.isRMQR();
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}
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} // namespace ZXing::QRCode
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