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partial stub out of decoder

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This commit is contained in:
Henry Schimke
2023-03-27 11:45:26 -05:00
parent d2316408b5
commit 0636a63291
13 changed files with 977 additions and 317 deletions
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203
src/qrcode/cpp_port/bitmatrix_parser.rs Normal file
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@@ -0,0 +1,203 @@
// /*
// * Copyright 2016 Nu-book Inc.
// * Copyright 2016 ZXing authors
// */
// // SPDX-License-Identifier: Apache-2.0
use crate::{
common::{BitMatrix, Result},
qrcode::decoder::{FormatInformation, Version, VersionRef},
Exceptions,
};
pub fn getBit(bitMatrix: &BitMatrix, x: u32, y: u32, mirrored: Option<bool>) -> bool {
let mirrored = mirrored.unwrap_or(false);
if mirrored {
bitMatrix.get(y, x)
} else {
bitMatrix.get(x, y)
}
}
pub fn hasValidDimension(bitMatrix: &BitMatrix, isMicro: bool) -> bool {
let dimension = bitMatrix.height();
if (isMicro) {
dimension >= 11 && dimension <= 17 && (dimension % 2) == 1
} else {
dimension >= 21 && dimension <= 177 && (dimension % 4) == 1
}
}
pub fn ReadVersion(bitMatrix: &BitMatrix) -> Result<VersionRef> {
todo!()
// int dimension = bitMatrix.height();
// const Version* version = Version::FromDimension(dimension);
// if (!version || version->versionNumber() < 7)
// return version;
// for (bool mirror : {false, true}) {
// // Read top-right/bottom-left version info: 3 wide by 6 tall (depending on mirrored)
// int versionBits = 0;
// for (int y = 5; y >= 0; --y)
// for (int x = dimension - 9; x >= dimension - 11; --x)
// AppendBit(versionBits, getBit(bitMatrix, x, y, mirror));
// version = Version::DecodeVersionInformation(versionBits);
// if (version && version->dimension() == dimension)
// return version;
// }
// return nullptr;
}
pub fn ReadFormatInformation(bitMatrix: &BitMatrix, isMicro: bool) -> Result<FormatInformation> {
todo!()
// if (!hasValidDimension(bitMatrix, isMicro))
// return {};
// if (isMicro) {
// // Read top-left format info bits
// int formatInfoBits = 0;
// for (int x = 1; x < 9; x++)
// AppendBit(formatInfoBits, getBit(bitMatrix, x, 8));
// for (int y = 7; y >= 1; y--)
// AppendBit(formatInfoBits, getBit(bitMatrix, 8, y));
// return FormatInformation::DecodeMQR(formatInfoBits);
// }
// // Read top-left format info bits
// int formatInfoBits1 = 0;
// for (int x = 0; x < 6; x++)
// AppendBit(formatInfoBits1, getBit(bitMatrix, x, 8));
// // .. and skip a bit in the timing pattern ...
// AppendBit(formatInfoBits1, getBit(bitMatrix, 7, 8));
// AppendBit(formatInfoBits1, getBit(bitMatrix, 8, 8));
// AppendBit(formatInfoBits1, getBit(bitMatrix, 8, 7));
// // .. and skip a bit in the timing pattern ...
// for (int y = 5; y >= 0; y--)
// AppendBit(formatInfoBits1, getBit(bitMatrix, 8, y));
// // Read the top-right/bottom-left pattern including the 'Dark Module' from the bottom-left
// // part that has to be considered separately when looking for mirrored symbols.
// // See also FormatInformation::DecodeQR
// int dimension = bitMatrix.height();
// int formatInfoBits2 = 0;
// for (int y = dimension - 1; y >= dimension - 8; y--)
// AppendBit(formatInfoBits2, getBit(bitMatrix, 8, y));
// for (int x = dimension - 8; x < dimension; x++)
// AppendBit(formatInfoBits2, getBit(bitMatrix, x, 8));
// return FormatInformation::DecodeQR(formatInfoBits1, formatInfoBits2);
}
pub fn ReadQRCodewords(
bitMatrix: &BitMatrix,
version: VersionRef,
formatInfo: &FormatInformation,
) -> Result<Vec<u8>> {
todo!()
// BitMatrix functionPattern = version.buildFunctionPattern();
// ByteArray result;
// result.reserve(version.totalCodewords());
// uint8_t currentByte = 0;
// bool readingUp = true;
// int bitsRead = 0;
// int dimension = bitMatrix.height();
// // Read columns in pairs, from right to left
// for (int x = dimension - 1; x > 0; x -= 2) {
// // Skip whole column with vertical timing pattern.
// if (x == 6)
// x--;
// // Read alternatingly from bottom to top then top to bottom
// for (int row = 0; row < dimension; row++) {
// int y = readingUp ? dimension - 1 - row : row;
// for (int col = 0; col < 2; col++) {
// int xx = x - col;
// // Ignore bits covered by the function pattern
// if (!functionPattern.get(xx, y)) {
// // Read a bit
// AppendBit(currentByte,
// GetDataMaskBit(formatInfo.dataMask, xx, y) != getBit(bitMatrix, xx, y, formatInfo.isMirrored));
// // If we've made a whole byte, save it off
// if (++bitsRead % 8 == 0)
// result.push_back(std::exchange(currentByte, 0));
// }
// }
// }
// readingUp = !readingUp; // switch directions
// }
// if (Size(result) != version.totalCodewords())
// return {};
// return result;
}
pub fn ReadMQRCodewords(
bitMatrix: &BitMatrix,
version: VersionRef,
formatInfo: &FormatInformation,
) -> Result<Vec<u8>> {
todo!()
// BitMatrix functionPattern = version.buildFunctionPattern();
// // D3 in a Version M1 symbol, D11 in a Version M3-L symbol and D9
// // in a Version M3-M symbol is a 2x2 square 4-module block.
// // See ISO 18004:2006 6.7.3.
// bool hasD4mBlock = version.versionNumber() % 2 == 1;
// int d4mBlockIndex =
// version.versionNumber() == 1 ? 3 : (formatInfo.ecLevel == QRCode::ErrorCorrectionLevel::Low ? 11 : 9);
// ByteArray result;
// result.reserve(version.totalCodewords());
// uint8_t currentByte = 0;
// bool readingUp = true;
// int bitsRead = 0;
// int dimension = bitMatrix.height();
// // Read columns in pairs, from right to left
// for (int x = dimension - 1; x > 0; x -= 2) {
// // Read alternatingly from bottom to top then top to bottom
// for (int row = 0; row < dimension; row++) {
// int y = readingUp ? dimension - 1 - row : row;
// for (int col = 0; col < 2; col++) {
// int xx = x - col;
// // Ignore bits covered by the function pattern
// if (!functionPattern.get(xx, y)) {
// // Read a bit
// AppendBit(currentByte,
// GetDataMaskBit(formatInfo.dataMask, xx, y, true) != getBit(bitMatrix, xx, y, formatInfo.isMirrored));
// ++bitsRead;
// // If we've made a whole byte, save it off; save early if 2x2 data block.
// if (bitsRead == 8 || (bitsRead == 4 && hasD4mBlock && Size(result) == d4mBlockIndex - 1)) {
// result.push_back(std::exchange(currentByte, 0));
// bitsRead = 0;
// }
// }
// }
// }
// readingUp = !readingUp; // switch directions
// }
// if (Size(result) != version.totalCodewords())
// return {};
// return result;
}
pub fn ReadCodewords(
bitMatrix: &BitMatrix,
version: VersionRef,
formatInfo: &FormatInformation,
) -> Result<Vec<u8>> {
if (!hasValidDimension(bitMatrix, version.isMicroQRCode())) {
return Err(Exceptions::FORMAT);
}
if version.isMicroQRCode() {
ReadMQRCodewords(bitMatrix, version, formatInfo)
} else {
ReadQRCodewords(bitMatrix, version, formatInfo)
}
}

725
src/qrcode/cpp_port/decoder.rs
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@@ -4,357 +4,450 @@
// */
// // SPDX-License-Identifier: Apache-2.0
// #include "QRDecoder.h"
use crate::common::cpp_essentials::{DecoderResult, StructuredAppendInfo};
use crate::common::reedsolomon::{
get_predefined_genericgf, PredefinedGenericGF, ReedSolomonDecoder,
};
use crate::common::{
AIFlag, BitMatrix, BitSource, CharacterSet, DecoderRXingResult, ECIStringBuilder, Eci, Result,
SymbologyIdentifier,
};
use crate::qrcode::cpp_port::bitmatrix_parser::{
ReadCodewords, ReadFormatInformation, ReadVersion,
};
use crate::qrcode::decoder::{DataBlock, ErrorCorrectionLevel, Mode, Version};
use crate::Exceptions;
// #include "BitMatrix.h"
// #include "BitSource.h"
// #include "CharacterSet.h"
// #include "DecoderResult.h"
// #include "GenericGF.h"
// #include "QRBitMatrixParser.h"
// #include "QRCodecMode.h"
// #include "QRDataBlock.h"
// #include "QRFormatInformation.h"
// #include "QRVersion.h"
// #include "ReedSolomonDecoder.h"
// #include "StructuredAppend.h"
// #include "ZXAlgorithms.h"
// #include "ZXTestSupport.h"
/**
* <p>Given data and error-correction codewords received, possibly corrupted by errors, attempts to
* correct the errors in-place using Reed-Solomon error correction.</p>
*
* @param codewordBytes data and error correction codewords
* @param numDataCodewords number of codewords that are data bytes
* @return false if error correction fails
*/
pub fn CorrectErrors(codewordBytes: &mut [u8], numDataCodewords: u32) -> Result<bool> {
// First read into an array of ints
// std::vector<int> codewordsInts(codewordBytes.begin(), codewordBytes.end());
let mut codewordsInts = codewordBytes.iter().copied().map(|b| b as i32).collect();
// #include <algorithm>
// #include <stdexcept>
// #include <utility>
// #include <vector>
let numECCodewords = ((codewordBytes.len() as u32) - numDataCodewords) as i32;
let rs = ReedSolomonDecoder::new(get_predefined_genericgf(
PredefinedGenericGF::QrCodeField256,
));
if rs.decode(&mut codewordsInts, numECCodewords)? == 0
// if (!ReedSolomonDecode(GenericGF::QRCodeField256(), codewordsInts, numECCodewords))
{
return Ok(false);
}
// namespace ZXing::QRCode {
// Copy back into array of bytes -- only need to worry about the bytes that were data
// We don't care about errors in the error-correction codewords
codewordBytes[..numDataCodewords as usize].copy_from_slice(
&codewordsInts[..numDataCodewords as usize]
.into_iter()
.copied()
.map(|i| i as u8)
.collect::<Vec<u8>>(),
);
// std::copy_n(codewordsInts.begin(), numDataCodewords, codewordBytes.begin());
// /**
// * <p>Given data and error-correction codewords received, possibly corrupted by errors, attempts to
// * correct the errors in-place using Reed-Solomon error correction.</p>
// *
// * @param codewordBytes data and error correction codewords
// * @param numDataCodewords number of codewords that are data bytes
// * @return false if error correction fails
// */
// static bool CorrectErrors(ByteArray& codewordBytes, int numDataCodewords)
// {
// // First read into an array of ints
// std::vector<int> codewordsInts(codewordBytes.begin(), codewordBytes.end());
Ok(true)
}
// int numECCodewords = Size(codewordBytes) - numDataCodewords;
// if (!ReedSolomonDecode(GenericGF::QRCodeField256(), codewordsInts, numECCodewords))
// return false;
/**
* See specification GBT 18284-2000
*/
pub fn DecodeHanziSegment(
bits: &mut BitSource,
count: u32,
result: &mut ECIStringBuilder,
) -> Result<()> {
let mut count = count;
// // Copy back into array of bytes -- only need to worry about the bytes that were data
// // We don't care about errors in the error-correction codewords
// std::copy_n(codewordsInts.begin(), numDataCodewords, codewordBytes.begin());
// return true;
// }
// Each character will require 2 bytes, decode as GB2312
// There is no ECI value for GB2312, use GB18030 which is a superset
result.switch_encoding(CharacterSet::GB18030);
result.reserve(2 * count as usize);
while (count > 0) {
// Each 13 bits encodes a 2-byte character
let twoBytes = bits.readBits(13)?;
let mut assembledTwoBytes = ((twoBytes / 0x060) << 8) | (twoBytes % 0x060);
if (assembledTwoBytes < 0x00A00) {
// In the 0xA1A1 to 0xAAFE range
assembledTwoBytes += 0x0A1A1;
} else {
// In the 0xB0A1 to 0xFAFE range
assembledTwoBytes += 0x0A6A1;
}
*result += ((assembledTwoBytes >> 8) & 0xFF) as u8;
*result += (assembledTwoBytes & 0xFF) as u8;
count -= 1;
}
Ok(())
}
// /**
// * See specification GBT 18284-2000
// */
// static void DecodeHanziSegment(BitSource& bits, int count, Content& result)
// {
// // Each character will require 2 bytes, decode as GB2312
// // There is no ECI value for GB2312, use GB18030 which is a superset
// result.switchEncoding(CharacterSet::GB18030);
// result.reserve(2 * count);
pub fn DecodeKanjiSegment(
bits: &mut BitSource,
count: u32,
result: &mut ECIStringBuilder,
) -> Result<()> {
let mut count = count;
// Each character will require 2 bytes. Read the characters as 2-byte pairs
// and decode as Shift_JIS afterwards
result.switch_encoding(CharacterSet::Shift_JIS);
result.reserve(2 * count as usize);
// while (count > 0) {
// // Each 13 bits encodes a 2-byte character
// int twoBytes = bits.readBits(13);
// int assembledTwoBytes = ((twoBytes / 0x060) << 8) | (twoBytes % 0x060);
// if (assembledTwoBytes < 0x00A00) {
// // In the 0xA1A1 to 0xAAFE range
// assembledTwoBytes += 0x0A1A1;
// } else {
// // In the 0xB0A1 to 0xFAFE range
// assembledTwoBytes += 0x0A6A1;
// }
// result += narrow_cast<uint8_t>((assembledTwoBytes >> 8) & 0xFF);
// result += narrow_cast<uint8_t>(assembledTwoBytes & 0xFF);
// count--;
// }
// }
while (count > 0) {
// Each 13 bits encodes a 2-byte character
let twoBytes = bits.readBits(13)?;
let mut assembledTwoBytes = ((twoBytes / 0x0C0) << 8) | (twoBytes % 0x0C0);
if (assembledTwoBytes < 0x01F00) {
// In the 0x8140 to 0x9FFC range
assembledTwoBytes += 0x08140;
} else {
// In the 0xE040 to 0xEBBF range
assembledTwoBytes += 0x0C140;
}
*result += (assembledTwoBytes >> 8) as u8;
*result += (assembledTwoBytes) as u8;
count -= 1;
}
Ok(())
}
// static void DecodeKanjiSegment(BitSource& bits, int count, Content& result)
// {
// // Each character will require 2 bytes. Read the characters as 2-byte pairs
// // and decode as Shift_JIS afterwards
// result.switchEncoding(CharacterSet::Shift_JIS);
// result.reserve(2 * count);
pub fn DecodeByteSegment(
bits: &mut BitSource,
count: u32,
result: &mut ECIStringBuilder,
) -> Result<()> {
result.switch_encoding(CharacterSet::Unknown);
result.reserve(count as usize);
// while (count > 0) {
// // Each 13 bits encodes a 2-byte character
// int twoBytes = bits.readBits(13);
// int assembledTwoBytes = ((twoBytes / 0x0C0) << 8) | (twoBytes % 0x0C0);
// if (assembledTwoBytes < 0x01F00) {
// // In the 0x8140 to 0x9FFC range
// assembledTwoBytes += 0x08140;
// } else {
// // In the 0xE040 to 0xEBBF range
// assembledTwoBytes += 0x0C140;
// }
// result += narrow_cast<uint8_t>(assembledTwoBytes >> 8);
// result += narrow_cast<uint8_t>(assembledTwoBytes);
// count--;
// }
// }
for i in 0..count {
// for (int i = 0; i < count; i++)
*result += (bits.readBits(8)?) as u8;
}
Ok(())
}
// static void DecodeByteSegment(BitSource& bits, int count, Content& result)
// {
// result.switchEncoding(CharacterSet::Unknown);
// result.reserve(count);
pub fn ToAlphaNumericChar(value: u32) -> Result<char> {
let value = value as usize;
/**
* See ISO 18004:2006, 6.4.4 Table 5
*/
const ALPHANUMERIC_CHARS: [char; 45] = [
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
' ', '$', '%', '*', '+', '-', '.', '/', ':',
];
// for (int i = 0; i < count; i++)
// result += narrow_cast<uint8_t>(bits.readBits(8));
// }
if (value < 0 || value >= (ALPHANUMERIC_CHARS.len())) {
return Err(Exceptions::index_out_of_bounds_with(
"oAlphaNumericChar: out of range",
));
}
// static char ToAlphaNumericChar(int value)
// {
// /**
// * See ISO 18004:2006, 6.4.4 Table 5
// */
// static const char ALPHANUMERIC_CHARS[] = {
// '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B',
// 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',
// 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
// ' ', '$', '%', '*', '+', '-', '.', '/', ':'
// };
Ok(ALPHANUMERIC_CHARS[value])
}
// if (value < 0 || value >= Size(ALPHANUMERIC_CHARS))
// throw std::out_of_range("ToAlphaNumericChar: out of range");
pub fn DecodeAlphanumericSegment(
bits: &mut BitSource,
count: u32,
result: &mut ECIStringBuilder,
) -> Result<()> {
let mut count = count;
// return ALPHANUMERIC_CHARS[value];
// }
// Read two characters at a time
let mut buffer = String::new();
// static void DecodeAlphanumericSegment(BitSource& bits, int count, Content& result)
// {
// // Read two characters at a time
// std::string buffer;
// while (count > 1) {
// int nextTwoCharsBits = bits.readBits(11);
// buffer += ToAlphaNumericChar(nextTwoCharsBits / 45);
// buffer += ToAlphaNumericChar(nextTwoCharsBits % 45);
// count -= 2;
// }
// if (count == 1) {
// // special case: one character left
// buffer += ToAlphaNumericChar(bits.readBits(6));
// }
// // See section 6.4.8.1, 6.4.8.2
// if (result.symbology.aiFlag != AIFlag::None) {
// // We need to massage the result a bit if in an FNC1 mode:
// for (size_t i = 0; i < buffer.length(); i++) {
// if (buffer[i] == '%') {
// if (i < buffer.length() - 1 && buffer[i + 1] == '%') {
// // %% is rendered as %
// buffer.erase(i + 1);
// } else {
// // In alpha mode, % should be converted to FNC1 separator 0x1D
// buffer[i] = static_cast<char>(0x1D);
// }
// }
// }
// }
while count > 1 {
let nextTwoCharsBits = bits.readBits(11)?;
buffer.push(ToAlphaNumericChar(nextTwoCharsBits / 45)?);
buffer.push(ToAlphaNumericChar(nextTwoCharsBits % 45)?);
count -= 2;
}
if (count == 1) {
// special case: one character left
buffer.push(ToAlphaNumericChar(bits.readBits(6)?)?);
}
// See section 6.4.8.1, 6.4.8.2
if (result.symbology.aiFlag != AIFlag::None) {
// We need to massage the result a bit if in an FNC1 mode:
for i in 0..buffer.len() {
// for (size_t i = 0; i < buffer.length(); i++) {
if (buffer
.chars()
.nth(i)
.ok_or(Exceptions::INDEX_OUT_OF_BOUNDS)?
== '%')
{
if (i < buffer.len() - 1
&& buffer
.chars()
.nth(i + 1)
.ok_or(Exceptions::INDEX_OUT_OF_BOUNDS)?
== '%')
{
// %% is rendered as %
buffer.remove(i + 1);
// buffer.erase(i + 1);
} else {
// In alpha mode, % should be converted to FNC1 separator 0x1D
buffer.replace_range(i..i, &char::from(0x1D).to_string());
// buffer[i] = static_cast<char>(0x1D);
}
}
}
}
// result.switchEncoding(CharacterSet::ISO8859_1);
// result += buffer;
// }
result.switch_encoding(CharacterSet::ISO8859_1);
*result += buffer;
// static void DecodeNumericSegment(BitSource& bits, int count, Content& result)
// {
// result.switchEncoding(CharacterSet::ISO8859_1);
// result.reserve(count);
Ok(())
}
// while (count) {
// int n = std::min(count, 3);
// int nDigits = bits.readBits(1 + 3 * n); // read 4, 7 or 10 bits into 1, 2 or 3 digits
// result.append(ZXing::ToString(nDigits, n));
// count -= n;
// }
// }
pub fn DecodeNumericSegment(
bits: &mut BitSource,
count: u32,
result: &mut ECIStringBuilder,
) -> Result<()> {
let mut count = count;
// static ECI ParseECIValue(BitSource& bits)
// {
// int firstByte = bits.readBits(8);
// if ((firstByte & 0x80) == 0) {
// // just one byte
// return ECI(firstByte & 0x7F);
// }
// if ((firstByte & 0xC0) == 0x80) {
// // two bytes
// int secondByte = bits.readBits(8);
// return ECI(((firstByte & 0x3F) << 8) | secondByte);
// }
// if ((firstByte & 0xE0) == 0xC0) {
// // three bytes
// int secondThirdBytes = bits.readBits(16);
// return ECI(((firstByte & 0x1F) << 16) | secondThirdBytes);
// }
// throw FormatError("ParseECIValue: invalid value");
// }
result.switch_encoding(CharacterSet::ISO8859_1);
result.reserve(count as usize);
// /**
// * QR codes encode mode indicators and terminator codes into a constant bit length of 4.
// * Micro QR codes have terminator codes that vary in bit length but are always longer than
// * the mode indicators.
// * M1 - 0 length mode code, 3 bits terminator code
// * M2 - 1 bit mode code, 5 bits terminator code
// * M3 - 2 bit mode code, 7 bits terminator code
// * M4 - 3 bit mode code, 9 bits terminator code
// * IsTerminator peaks into the bit stream to see if the current position is at the start of
// * a terminator code. If true, then the decoding can finish. If false, then the decoding
// * can read off the next mode code.
// *
// * See ISO 18004:2015, 7.4.1 Table 2
// *
// * @param bits the stream of bits that might have a terminator code
// * @param version the QR or micro QR code version
// */
// bool IsEndOfStream(const BitSource& bits, const Version& version)
// {
// const int bitsRequired = TerminatorBitsLength(version);
// const int bitsAvailable = std::min(bits.available(), bitsRequired);
// return bitsAvailable == 0 || bits.peakBits(bitsAvailable) == 0;
// }
while (count > 0) {
let n = std::cmp::min(count, 3);
let nDigits = bits.readBits(1 + 3 * n as usize)?; // read 4, 7 or 10 bits into 1, 2 or 3 digits
result.append_string(&crate::common::cpp_essentials::util::ToString(
nDigits as usize,
n as usize,
)?);
count -= n;
}
// /**
// * <p>QR Codes can encode text as bits in one of several modes, and can use multiple modes
// * in one QR Code. This method decodes the bits back into text.</p>
// *
// * <p>See ISO 18004:2006, 6.4.3 - 6.4.7</p>
// */
Ok(())
}
pub fn ParseECIValue(bits: &mut BitSource) -> Result<Eci> {
let firstByte = bits.readBits(8)?;
if ((firstByte & 0x80) == 0) {
// just one byte
return Ok(Eci::from(firstByte & 0x7F));
}
if ((firstByte & 0xC0) == 0x80) {
// two bytes
let secondByte = bits.readBits(8)?;
return Ok(Eci::from(((firstByte & 0x3F) << 8) | secondByte));
}
if ((firstByte & 0xE0) == 0xC0) {
// three bytes
let secondThirdBytes = bits.readBits(16)?;
return Ok(Eci::from(((firstByte & 0x1F) << 16) | secondThirdBytes));
}
Err(Exceptions::format_with("ParseECIValue: invalid value"))
}
/**
* QR codes encode mode indicators and terminator codes into a constant bit length of 4.
* Micro QR codes have terminator codes that vary in bit length but are always longer than
* the mode indicators.
* M1 - 0 length mode code, 3 bits terminator code
* M2 - 1 bit mode code, 5 bits terminator code
* M3 - 2 bit mode code, 7 bits terminator code
* M4 - 3 bit mode code, 9 bits terminator code
* IsTerminator peaks into the bit stream to see if the current position is at the start of
* a terminator code. If true, then the decoding can finish. If false, then the decoding
* can read off the next mode code.
*
* See ISO 18004:2015, 7.4.1 Table 2
*
* @param bits the stream of bits that might have a terminator code
* @param version the QR or micro QR code version
*/
pub fn IsEndOfStream(bits: &mut BitSource, version: &Version) -> Result<bool> {
let bitsRequired = Mode::get_terminator_bit_length(version); //super::qr_codec_mode::TerminatorBitsLength(version);
let bitsAvailable = std::cmp::min(bits.available(), bitsRequired as usize);
Ok(bitsAvailable == 0 || bits.peak_bits(bitsAvailable)? == 0)
}
/**
* <p>QR Codes can encode text as bits in one of several modes, and can use multiple modes
* in one QR Code. This method decodes the bits back into text.</p>
*
* <p>See ISO 18004:2006, 6.4.3 - 6.4.7</p>
*/
// ZXING_EXPORT_TEST_ONLY
// DecoderResult DecodeBitStream(ByteArray&& bytes, const Version& version, ErrorCorrectionLevel ecLevel)
// {
// BitSource bits(bytes);
// Content result;
// Error error;
// result.symbology = {'Q', '1', 1};
// StructuredAppendInfo structuredAppend;
// const int modeBitLength = CodecModeBitsLength(version);
pub fn DecodeBitStream(
bytes: &[u8],
version: &Version,
ecLevel: ErrorCorrectionLevel,
) -> Result<DecoderResult<bool>> {
let mut bits = BitSource::new(bytes.to_vec());
let mut result = ECIStringBuilder::default();
// Error error;
result.symbology = SymbologyIdentifier {
code: b'Q',
modifier: b'1',
eciModifierOffset: 1,
aiFlag: AIFlag::None,
}; //{'Q', '1', 1};
let mut structuredAppend = StructuredAppendInfo::default();
let modeBitLength = Mode::get_codec_mode_bits_length(version);
// try
// {
// while(!IsEndOfStream(bits, version)) {
// CodecMode mode;
// if (modeBitLength == 0)
// mode = CodecMode::NUMERIC; // MicroQRCode version 1 is always NUMERIC and modeBitLength is 0
// else
// mode = CodecModeForBits(bits.readBits(modeBitLength), version.isMicroQRCode());
let res = (|| {
while (!IsEndOfStream(&mut bits, version)?) {
let mode: Mode;
if (modeBitLength == 0) {
mode = Mode::NUMERIC; // MicroQRCode version 1 is always NUMERIC and modeBitLength is 0
} else {
mode = Mode::CodecModeForBits(
bits.readBits(modeBitLength as usize)?,
Some(version.isMicroQRCode()),
);
}
// switch (mode) {
// case CodecMode::FNC1_FIRST_POSITION:
// // if (!result.empty()) // uncomment to enforce specification
// // throw FormatError("GS1 Indicator (FNC1 in first position) at illegal position");
// result.symbology.modifier = '3';
// result.symbology.aiFlag = AIFlag::GS1; // In Alphanumeric mode undouble doubled '%' and treat single '%' as <GS>
// break;
// case CodecMode::FNC1_SECOND_POSITION:
// if (!result.empty())
// throw FormatError("AIM Application Indicator (FNC1 in second position) at illegal position");
// result.symbology.modifier = '5'; // As above
// // ISO/IEC 18004:2015 7.4.8.3 AIM Application Indicator (FNC1 in second position), "00-99" or "A-Za-z"
// if (int appInd = bits.readBits(8); appInd < 100) // "00-09"
// result += ZXing::ToString(appInd, 2);
// else if ((appInd >= 165 && appInd <= 190) || (appInd >= 197 && appInd <= 222)) // "A-Za-z"
// result += narrow_cast<uint8_t>(appInd - 100);
// else
// throw FormatError("Invalid AIM Application Indicator");
// result.symbology.aiFlag = AIFlag::AIM; // see also above
// break;
// case CodecMode::STRUCTURED_APPEND:
// // sequence number and parity is added later to the result metadata
// // Read next 4 bits of index, 4 bits of symbol count, and 8 bits of parity data, then continue
// structuredAppend.index = bits.readBits(4);
// structuredAppend.count = bits.readBits(4) + 1;
// structuredAppend.id = std::to_string(bits.readBits(8));
// break;
// case CodecMode::ECI:
// // Count doesn't apply to ECI
// result.switchEncoding(ParseECIValue(bits));
// break;
// case CodecMode::HANZI: {
// // First handle Hanzi mode which does not start with character count
// // chinese mode contains a sub set indicator right after mode indicator
// if (int subset = bits.readBits(4); subset != 1) // GB2312_SUBSET is the only supported one right now
// throw FormatError("Unsupported HANZI subset");
// int count = bits.readBits(CharacterCountBits(mode, version));
// DecodeHanziSegment(bits, count, result);
// break;
// }
// default: {
// // "Normal" QR code modes:
// // How many characters will follow, encoded in this mode?
// int count = bits.readBits(CharacterCountBits(mode, version));
// switch (mode) {
// case CodecMode::NUMERIC: DecodeNumericSegment(bits, count, result); break;
// case CodecMode::ALPHANUMERIC: DecodeAlphanumericSegment(bits, count, result); break;
// case CodecMode::BYTE: DecodeByteSegment(bits, count, result); break;
// case CodecMode::KANJI: DecodeKanjiSegment(bits, count, result); break;
// default: throw FormatError("Invalid CodecMode");
// }
// break;
// }
// }
// }
// } catch (std::out_of_range& e) { // see BitSource::readBits
// error = FormatError("Truncated bit stream");
// } catch (Error e) {
// error = std::move(e);
// }
match (mode) {
Mode::FNC1_FIRST_POSITION => {
// if (!result.empty()) // uncomment to enforce specification
// throw FormatError("GS1 Indicator (FNC1 in first position) at illegal position");
result.symbology.modifier = b'3';
result.symbology.aiFlag = AIFlag::GS1; // In Alphanumeric mode undouble doubled '%' and treat single '%' as <GS>
}
Mode::FNC1_SECOND_POSITION => {
if (!result.is_empty()) {
return Err(Exceptions::format_with("AIM Application Indicator (FNC1 in second position) at illegal position"));
// throw FormatError("AIM Application Indicator (FNC1 in second position) at illegal position");
}
result.symbology.modifier = b'5'; // As above
// ISO/IEC 18004:2015 7.4.8.3 AIM Application Indicator (FNC1 in second position), "00-99" or "A-Za-z"
let appInd = bits.readBits(8)?;
if (appInd < 100)
// "00-09"
{
result +=
crate::common::cpp_essentials::util::ToString(appInd as usize, 2)?;
} else if ((appInd >= 165 && appInd <= 190) || (appInd >= 197 && appInd <= 222))
// "A-Za-z"
{
result += (appInd - 100) as u8;
} else {
return Err(Exceptions::format_with("Invalid AIM Application Indicator"));
// throw FormatError("Invalid AIM Application Indicator");
}
result.symbology.aiFlag = AIFlag::AIM; // see also above
}
Mode::STRUCTURED_APPEND => {
// sequence number and parity is added later to the result metadata
// Read next 4 bits of index, 4 bits of symbol count, and 8 bits of parity data, then continue
structuredAppend.index = bits.readBits(4)? as i32;
structuredAppend.count = bits.readBits(4)? as i32 + 1;
structuredAppend.id = (bits.readBits(8)?).to_string(); //std::to_string(bits.readBits(8));
}
Mode::ECI => {
// Count doesn't apply to ECI
result.switch_encoding(ParseECIValue(&mut bits)?.into());
}
Mode::HANZI => {
// First handle Hanzi mode which does not start with character count
// chinese mode contains a sub set indicator right after mode indicator
let subset = bits.readBits(4)?;
if (subset != 1)
// GB2312_SUBSET is the only supported one right now
{
return Err(Exceptions::format_with("Unsupported HANZI subset"));
// throw FormatError("Unsupported HANZI subset");
}
let count = bits.readBits(mode.CharacterCountBits(version) as usize)?;
DecodeHanziSegment(&mut bits, count, &mut result);
}
_ => {
// "Normal" QR code modes:
// How many characters will follow, encoded in this mode?
let count = bits.readBits(mode.CharacterCountBits(version) as usize)?;
match (mode) {
Mode::NUMERIC => DecodeNumericSegment(&mut bits, count, &mut result),
Mode::ALPHANUMERIC => {
DecodeAlphanumericSegment(&mut bits, count, &mut result)
}
Mode::BYTE => DecodeByteSegment(&mut bits, count, &mut result),
Mode::KANJI => DecodeKanjiSegment(&mut bits, count, &mut result),
_ => return Err(Exceptions::format_with("Invalid CodecMode")), //throw FormatError("Invalid CodecMode");
};
}
}
}
Ok(())
})();
// } catch (std::out_of_range& e) { // see BitSource::readBits
// error = FormatError("Truncated bit stream");
// } catch (Error e) {
// error = std::move(e);
// }
// return DecoderResult(std::move(result))
// .setError(std::move(error))
// .setEcLevel(ToString(ecLevel))
// .setVersionNumber(version.versionNumber())
// .setStructuredAppend(structuredAppend);
// }
Ok(DecoderResult::with_eci_string_builder(result)
.withEcLevel(ecLevel.to_string())
.withVersionNumber(version.getVersionNumber())
.withStructuredAppend(structuredAppend))
// DecoderResult Decode(const BitMatrix& bits)
// {
// const Version* pversion = ReadVersion(bits);
// if (!pversion)
// return FormatError("Invalid version");
// const Version& version = *pversion;
// return DecoderResult(std::move(result))
// .setError(std::move(error))
// .setEcLevel(ToString(ecLevel))
// .setVersionNumber(version.versionNumber())
// .setStructuredAppend(structuredAppend);
}
// auto formatInfo = ReadFormatInformation(bits, version.isMicroQRCode());
// if (!formatInfo.isValid())
// return FormatError("Invalid format information");
pub fn Decode(bits: &BitMatrix) -> Result<DecoderResult<bool>> {
let Ok(pversion) = ReadVersion(bits) else {
return Err(Exceptions::format_with("Invalid version"))
};
let version = pversion;
// // Read codewords
// ByteArray codewords = ReadCodewords(bits, version, formatInfo);
// if (codewords.empty())
// return FormatError("Failed to read codewords");
let Ok(formatInfo) = ReadFormatInformation(bits, version.isMicroQRCode()) else {
return Err(Exceptions::format_with("Invalid format information"))
};
// // Separate into data blocks
// std::vector<DataBlock> dataBlocks = DataBlock::GetDataBlocks(codewords, version, formatInfo.ecLevel);
// if (dataBlocks.empty())
// return FormatError("Failed to get data blocks");
// Read codewords
let codewords = ReadCodewords(bits, &version, &formatInfo)?;
if (codewords.is_empty()) {
return Err(Exceptions::format_with("Failed to read codewords"));
}
// // Count total number of data bytes
// const auto op = [](auto totalBytes, const auto& dataBlock){ return totalBytes + dataBlock.numDataCodewords();};
// const auto totalBytes = std::accumulate(std::begin(dataBlocks), std::end(dataBlocks), int{}, op);
// ByteArray resultBytes(totalBytes);
// auto resultIterator = resultBytes.begin();
// Separate into data blocks
let dataBlocks: Vec<DataBlock> =
DataBlock::getDataBlocks(&codewords, &version, formatInfo.error_correction_level)?;
if (dataBlocks.is_empty()) {
return Err(Exceptions::format_with("Failed to get data blocks"));
}
// // Error-correct and copy data blocks together into a stream of bytes
// for (auto& dataBlock : dataBlocks)
// {
// ByteArray& codewordBytes = dataBlock.codewords();
// int numDataCodewords = dataBlock.numDataCodewords();
// Count total number of data bytes
let op = |totalBytes, dataBlock: &DataBlock| totalBytes + dataBlock.getNumDataCodewords();
let totalBytes = dataBlocks.iter().fold(0, op); // std::accumulate(std::begin(dataBlocks), std::end(dataBlocks), int{}, op);
let mut resultBytes = vec![0u8; totalBytes as usize];
let mut resultIterator = 0; //resultBytes.begin();
// if (!CorrectErrors(codewordBytes, numDataCodewords))
// return ChecksumError();
// Error-correct and copy data blocks together into a stream of bytes
for dataBlock in dataBlocks.iter() {
let mut codewordBytes = dataBlock.getCodewords().to_vec();
let numDataCodewords = dataBlock.getNumDataCodewords() as usize;
// resultIterator = std::copy_n(codewordBytes.begin(), numDataCodewords, resultIterator);
// }
if (!CorrectErrors(&mut codewordBytes, numDataCodewords as u32)?) {
return Err(Exceptions::CHECKSUM);
}
// // Decode the contents of that stream of bytes
// return DecodeBitStream(std::move(resultBytes), version, formatInfo.ecLevel).setIsMirrored(formatInfo.isMirrored);
// }
// resultIterator = std::copy_n(codewordBytes.begin(), numDataCodewords, resultIterator);
resultBytes[resultIterator..numDataCodewords]
.copy_from_slice(&codewordBytes[..numDataCodewords]);
resultIterator += numDataCodewords;
}
// Decode the contents of that stream of bytes
Ok(
DecodeBitStream(&resultBytes, &version, formatInfo.error_correction_level)?
.withIsMirrored(formatInfo.isMirrored),
)
}
// } // namespace ZXing::QRCode

2
src/qrcode/cpp_port/mod.rs
View File

@@ -1,2 +1,4 @@
pub mod decoder;
pub mod detector;
mod bitmatrix_parser;