import BarcodeFormat from '../BarcodeFormat' ; import BitArray from '../common/BitArray' ; import DecodeHintType from '../DecodeHintType' ; import Result from '../Result' ; import ResultMetadataType from '../ResultMetadataType' ; import ResultPoint from '../ResultPoint' ; import UPCEANExtensionSupport from './UPCEANExtensionSupport' ; import AbstractUPCEANReader from './AbstractUPCEANReader' ; import NotFoundException from '../NotFoundException' ; import FormatException from '../FormatException' ; import ChecksumException from '../ChecksumException' ; author dswitkin google author Sean Owen
 *  author alasdair google export default abstract class UPCEANReader extends AbstractUPCEANReader { public constructor ( ) { super ( ) ; this . decodeRowStringBuffer = '' ; UPCEANReader . L_AND_G_PATTERNS = UPCEANReader . L_PATTERNS . map ( arr => Int32Array . from ( arr ) ) ; for ( let i = 10 ; i < 20 ; i ++ ) { let widths = UPCEANReader . L_PATTERNS [ i - 10 ] ; let reversedWidths = new Int32Array ( widths . length ) ; for ( let j = 0 ; j < widths . length ; j ++ ) { reversedWidths [ j ] = widths [ widths . length - j - 1 ] ; } UPCEANReader . L_AND_G_PATTERNS [ i ] = reversedWidths ; } } public decodeRow ( rowNumber , row , hints ? ) { let startGuardRange = UPCEANReader . findStartGuardPattern ( row ) ; let resultPointCallback = hints == null ? null : hints . get ( DecodeHintType . NEED_RESULT_POINT_CALLBACK ) ; if ( resultPointCallback != null ) { const resultPoint = new ResultPoint ( ( startGuardRange [ 0 ] + startGuardRange [ 1 ] ) / 2.0 , rowNumber ) ; resultPointCallback . foundPossibleResultPoint ( resultPoint ) ; } let budello = this . decodeMiddle ( row , startGuardRange , this . decodeRowStringBuffer ) ; let endStart = budello . rowOffset ; let result = budello . resultString ; if ( resultPointCallback != null ) { const resultPoint = new ResultPoint ( endStart , rowNumber ) ; resultPointCallback . foundPossibleResultPoint ( resultPoint ) ; } let endRange = UPCEANReader . decodeEnd ( row , endStart ) ; if ( resultPointCallback != null ) { const resultPoint = new ResultPoint ( ( endRange [ 0 ] + endRange [ 1 ] ) / 2.0 , rowNumber ) ; resultPointCallback . foundPossibleResultPoint ( resultPoint ) ; } let end = endRange [ 1 ] ; let quietEnd = end + ( end - endRange [ 0 ] ) ; if ( quietEnd >= row . getSize ( ) || ! row . isRange ( end , quietEnd , false ) ) { throw new NotFoundException ( ) ; } let resultString = result . toString ( ) ; if ( resultString . length < 8 ) { throw new FormatException ( ) ; } if ( ! UPCEANReader . checkChecksum ( resultString ) ) { throw new ChecksumException ( ) ; } let left = ( startGuardRange [ 1 ] + startGuardRange [ 0 ] ) / 2.0 ; let right = ( endRange [ 1 ] + endRange [ 0 ] ) / 2.0 ; let format = this . getBarcodeFormat ( ) ; let resultPoint = [ new ResultPoint ( left , rowNumber ) , new ResultPoint ( right , rowNumber ) ] ; let decodeResult = new Result ( resultString , null , 0 , resultPoint , format , new Date ( ) . getTime ( ) ) ; let extensionLength = 0 ; try { let extensionResult = UPCEANExtensionSupport . decodeRow ( rowNumber , row , endRange [ 1 ] ) ; decodeResult . putMetadata ( ResultMetadataType . UPC_EAN_EXTENSION , extensionResult . getText ( ) ) ; decodeResult . putAllMetadata ( extensionResult . getResultMetadata ( ) ) ; decodeResult . addResultPoints ( extensionResult . getResultPoints ( ) ) ; extensionLength = extensionResult . getText ( ) . length ; } catch ( err ) { } let allowedExtensions = hints == null ? null : hints . get ( DecodeHintType . ALLOWED_EAN_EXTENSIONS ) ; if ( allowedExtensions != null ) { let valid = false ; for ( let length in allowedExtensions ) { if ( extensionLength . toString ( ) === length ) { valid = true ; break ; } } if ( ! valid ) { throw new NotFoundException ( ) ; } } if ( format === BarcodeFormat . EAN_13 || format === BarcodeFormat . UPC_A ) { } return decodeResult ; } static checkChecksum ( s ) { return UPCEANReader . checkStandardUPCEANChecksum ( s ) ; } static checkStandardUPCEANChecksum ( s ) { let length = s . length ; if ( length === 0 ) return false ; let check = parseInt ( s . charAt ( length - 1 ) , 10 ) ; return UPCEANReader . getStandardUPCEANChecksum ( s . substring ( 0 , length - 1 ) ) === check ; } static getStandardUPCEANChecksum ( s ) { let length = s . length ; let sum = 0 ; for ( let i = length - 1 ; i >= 0 ; i -= 2 ) { let digit = s . charAt ( i ) . charCodeAt ( 0 ) - '0' . charCodeAt ( 0 ) ; if ( digit < 0 || digit > 9 ) { throw new FormatException ( ) ; } sum += digit ; } sum *= 3 ; for ( let i = length - 2 ; i >= 0 ; i -= 2 ) { let digit = s . charAt ( i ) . charCodeAt ( 0 ) - '0' . charCodeAt ( 0 ) ; if ( digit < 0 || digit > 9 ) { throw new FormatException ( ) ; } sum += digit ; } return ( 1000 - sum ) % 10 ; } static decodeEnd ( row , endStart ) { return UPCEANReader . findGuardPattern ( row , endStart , false , UPCEANReader . START_END_PATTERN , new Int32Array ( UPCEANReader . START_END_PATTERN . length ) . fill ( 0 ) ) ; } }