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/*
* Copyright 2008 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.
*/
use rxing_one_d_proc_derive::{EANReader, OneDReader};
use super::UPCEANReader;
use super::upc_ean_reader;
use super::OneDReader;
use crate::common::Result;
use crate::BarcodeFormat;
use crate::Exceptions;
/**
* <p>Implements decoding of the EAN-13 format.</p>
*
* @author dswitkin@google.com (Daniel Switkin)
* @author Sean Owen
* @author alasdair@google.com (Alasdair Mackintosh)
*/
#[derive(OneDReader, EANReader, Default)]
pub struct EAN13Reader;
impl UPCEANReader for EAN13Reader {
fn getBarcodeFormat(&self) -> crate::BarcodeFormat {
BarcodeFormat::EAN_13
}
fn decodeMiddle(
&self,
row: &crate::common::BitArray,
startRange: &[usize; 2],
resultString: &mut String,
) -> Result<usize> {
let mut counters = [0_u32; 4]; //decodeMiddleCounters;
// counters[0] = 0;
// counters[1] = 0;
// counters[2] = 0;
// counters[3] = 0;
let end = row.get_size();
let mut rowOffset = startRange[1];
let mut lgPatternFound = 0;
let mut x = 0;
while x < 6 && rowOffset < end {
// for (int x = 0; x < 6 && rowOffset < end; x++) {
let bestMatch = self.decodeDigit(
row,
&mut counters,
rowOffset,
&upc_ean_reader::L_AND_G_PATTERNS,
)?;
resultString
.push(char::from_u32('0' as u32 + bestMatch as u32 % 10).ok_or(Exceptions::PARSE)?);
rowOffset += counters.iter().sum::<u32>() as usize;
if bestMatch >= 10 {
lgPatternFound |= 1 << (5 - x);
}
x += 1;
}
Self::determineFirstDigit(resultString, lgPatternFound)?;
let middleRange =
self.findGuardPattern(row, rowOffset, true, &upc_ean_reader::MIDDLE_PATTERN)?;
rowOffset = middleRange[1];
let mut x = 0;
while x < 6 && rowOffset < end {
let bestMatch =
self.decodeDigit(row, &mut counters, rowOffset, &upc_ean_reader::L_PATTERNS)?;
resultString
.push(char::from_u32('0' as u32 + bestMatch as u32).ok_or(Exceptions::PARSE)?);
rowOffset += counters.iter().sum::<u32>() as usize;
x += 1;
}
Ok(rowOffset)
}
}
impl EAN13Reader {
// For an EAN-13 barcode, the first digit is represented by the parities used
// to encode the next six digits, according to the table below. For example,
// if the barcode is 5 123456 789012 then the value of the first digit is
// signified by using odd for '1', even for '2', even for '3', odd for '4',
// odd for '5', and even for '6'. See http://en.wikipedia.org/wiki/EAN-13
//
// Parity of next 6 digits
// Digit 0 1 2 3 4 5
// 0 Odd Odd Odd Odd Odd Odd
// 1 Odd Odd Even Odd Even Even
// 2 Odd Odd Even Even Odd Even
// 3 Odd Odd Even Even Even Odd
// 4 Odd Even Odd Odd Even Even
// 5 Odd Even Even Odd Odd Even
// 6 Odd Even Even Even Odd Odd
// 7 Odd Even Odd Even Odd Even
// 8 Odd Even Odd Even Even Odd
// 9 Odd Even Even Odd Even Odd
//
// Note that the encoding for '0' uses the same parity as a UPC barcode. Hence
// a UPC barcode can be converted to an EAN-13 barcode by prepending a 0.
//
// The encoding is represented by the following array, which is a bit pattern
// using Odd = 0 and Even = 1. For example, 5 is represented by:
//
// Odd Even Even Odd Odd Even
// in binary:
// 0 1 1 0 0 1 == 0x19
//
pub const FIRST_DIGIT_ENCODINGS: [usize; 10] =
[0x00, 0x0B, 0x0D, 0xE, 0x13, 0x19, 0x1C, 0x15, 0x16, 0x1A];
/**
* Based on pattern of odd-even ('L' and 'G') patterns used to encoded the explicitly-encoded
* digits in a barcode, determines the implicitly encoded first digit and adds it to the
* result string.
*
* @param resultString string to insert decoded first digit into
* @param lgPatternFound int whose bits indicates the pattern of odd/even L/G patterns used to
* encode digits
* @throws NotFoundException if first digit cannot be determined
*/
fn determineFirstDigit(resultString: &mut String, lgPatternFound: usize) -> Result<()> {
for (d, &fde) in Self::FIRST_DIGIT_ENCODINGS.iter().enumerate() {
// for (int d = 0; d < 10; d++) {
if lgPatternFound == fde {
resultString.insert(
0,
char::from_u32('0' as u32 + d as u32).ok_or(Exceptions::PARSE)?,
);
return Ok(());
}
}
Err(Exceptions::NOT_FOUND)
}
}