@ -27,11 +27,11 @@
/ *
* Module "qrcodegen" . Public members inside this namespace :
* - Class QrCode :
* - Function encodeText ( str text , QrCode . Ecc ecl ) - > QrCode
* - Function encodeBinary ( list < int > data , QrCode . Ecc ecl ) - > QrCode
* - Function encodeSegments ( list < QrSegment > segs , QrCode . Ecc ecl ,
* int minVersion = 1 , int maxVersion = 40 , mask = - 1 , boostEcl = true ) - > QrCode
* - Class QrCode :
* - Constructor QrCode ( QrCode qr , int mask )
* - Constructor QrCode ( list < int > bytes , int mask , int version , QrCode . Ecc ecl )
* - Method getVersion ( ) - > int
@ -60,87 +60,6 @@
* /
var qrcodegen = new function ( ) {
/*---- Public static factory functions for QrCode ----*/
/ *
* Returns a QR Code symbol representing the given Unicode text string at the given error correction level .
* As a conservative upper bound , this function is guaranteed to succeed for strings that have 738 or fewer Unicode
* code points ( not UTF - 16 code units ) . The smallest possible QR Code version is automatically chosen for the output .
* /
this . encodeText = function ( text , ecl ) {
var segs = this . QrSegment . makeSegments ( text ) ;
return this . encodeSegments ( segs , ecl ) ;
} ;
/ *
* Returns a QR Code symbol representing the given binary data string at the given error correction level .
* This function always encodes using the binary segment mode , not any text mode . The maximum number of
* bytes allowed is 2953. The smallest possible QR Code version is automatically chosen for the output .
* /
this . encodeBinary = function ( data , ecl ) {
var seg = this . QrSegment . makeBytes ( data ) ;
return this . encodeSegments ( [ seg ] , ecl ) ;
} ;
/ *
* Returns a QR Code symbol representing the specified data segments with the specified encoding parameters .
* The smallest possible QR Code version within the specified range is automatically chosen for the output .
* This function allows the user to create a custom sequence of segments that switches
* between modes ( such as alphanumeric and binary ) to encode text more efficiently .
* This function is considered to be lower level than simply encoding text or binary data .
* /
this . encodeSegments = function ( segs , ecl , minVersion , maxVersion , mask , boostEcl ) {
if ( minVersion == undefined ) minVersion = 1 ;
if ( maxVersion == undefined ) maxVersion = 40 ;
if ( mask == undefined ) mask = - 1 ;
if ( boostEcl == undefined ) boostEcl = true ;
if ( ! ( 1 <= minVersion && minVersion <= maxVersion && maxVersion <= 40 ) || mask < - 1 || mask > 7 )
throw "Invalid value" ;
// Find the minimal version number to use
var version , dataUsedBits ;
for ( version = minVersion ; ; version ++ ) {
var dataCapacityBits = QrCode . getNumDataCodewords ( version , ecl ) * 8 ; // Number of data bits available
dataUsedBits = this . QrSegment . getTotalBits ( segs , version ) ;
if ( dataUsedBits != null && dataUsedBits <= dataCapacityBits )
break ; // This version number is found to be suitable
if ( version >= maxVersion ) // All versions in the range could not fit the given data
throw "Data too long" ;
}
// Increase the error correction level while the data still fits in the current version number
[ this . QrCode . Ecc . MEDIUM , this . QrCode . Ecc . QUARTILE , this . QrCode . Ecc . HIGH ] . forEach ( function ( newEcl ) {
if ( boostEcl && dataUsedBits <= QrCode . getNumDataCodewords ( version , newEcl ) * 8 )
ecl = newEcl ;
} ) ;
// Create the data bit string by concatenating all segments
var dataCapacityBits = QrCode . getNumDataCodewords ( version , ecl ) * 8 ;
var bb = new BitBuffer ( ) ;
segs . forEach ( function ( seg ) {
bb . appendBits ( seg . getMode ( ) . getModeBits ( ) , 4 ) ;
bb . appendBits ( seg . getNumChars ( ) , seg . getMode ( ) . numCharCountBits ( version ) ) ;
bb . appendData ( seg ) ;
} ) ;
// Add terminator and pad up to a byte if applicable
bb . appendBits ( 0 , Math . min ( 4 , dataCapacityBits - bb . bitLength ( ) ) ) ;
bb . appendBits ( 0 , ( 8 - bb . bitLength ( ) % 8 ) % 8 ) ;
// Pad with alternate bytes until data capacity is reached
for ( var padByte = 0xEC ; bb . bitLength ( ) < dataCapacityBits ; padByte ^= 0xEC ^ 0x11 )
bb . appendBits ( padByte , 8 ) ;
if ( bb . bitLength ( ) % 8 != 0 )
throw "Assertion error" ;
// Create the QR Code symbol
return new this . QrCode ( bb . getBytes ( ) , mask , version , ecl ) ;
} ;
/*---- QR Code symbol class ----*/
/ *
@ -594,6 +513,85 @@ var qrcodegen = new function() {
} ;
/*---- Public static factory functions for QrCode ----*/
/ *
* Returns a QR Code symbol representing the given Unicode text string at the given error correction level .
* As a conservative upper bound , this function is guaranteed to succeed for strings that have 738 or fewer Unicode
* code points ( not UTF - 16 code units ) . The smallest possible QR Code version is automatically chosen for the output .
* /
this . QrCode . encodeText = function ( text , ecl ) {
var segs = qrcodegen . QrSegment . makeSegments ( text ) ;
return this . encodeSegments ( segs , ecl ) ;
} ;
/ *
* Returns a QR Code symbol representing the given binary data string at the given error correction level .
* This function always encodes using the binary segment mode , not any text mode . The maximum number of
* bytes allowed is 2953. The smallest possible QR Code version is automatically chosen for the output .
* /
this . QrCode . encodeBinary = function ( data , ecl ) {
var seg = qrcodegen . QrSegment . makeBytes ( data ) ;
return this . encodeSegments ( [ seg ] , ecl ) ;
} ;
/ *
* Returns a QR Code symbol representing the specified data segments with the specified encoding parameters .
* The smallest possible QR Code version within the specified range is automatically chosen for the output .
* This function allows the user to create a custom sequence of segments that switches
* between modes ( such as alphanumeric and binary ) to encode text more efficiently .
* This function is considered to be lower level than simply encoding text or binary data .
* /
this . QrCode . encodeSegments = function ( segs , ecl , minVersion , maxVersion , mask , boostEcl ) {
if ( minVersion == undefined ) minVersion = 1 ;
if ( maxVersion == undefined ) maxVersion = 40 ;
if ( mask == undefined ) mask = - 1 ;
if ( boostEcl == undefined ) boostEcl = true ;
if ( ! ( 1 <= minVersion && minVersion <= maxVersion && maxVersion <= 40 ) || mask < - 1 || mask > 7 )
throw "Invalid value" ;
// Find the minimal version number to use
var version , dataUsedBits ;
for ( version = minVersion ; ; version ++ ) {
var dataCapacityBits = QrCode . getNumDataCodewords ( version , ecl ) * 8 ; // Number of data bits available
dataUsedBits = qrcodegen . QrSegment . getTotalBits ( segs , version ) ;
if ( dataUsedBits != null && dataUsedBits <= dataCapacityBits )
break ; // This version number is found to be suitable
if ( version >= maxVersion ) // All versions in the range could not fit the given data
throw "Data too long" ;
}
// Increase the error correction level while the data still fits in the current version number
[ this . Ecc . MEDIUM , this . Ecc . QUARTILE , this . Ecc . HIGH ] . forEach ( function ( newEcl ) {
if ( boostEcl && dataUsedBits <= QrCode . getNumDataCodewords ( version , newEcl ) * 8 )
ecl = newEcl ;
} ) ;
// Create the data bit string by concatenating all segments
var dataCapacityBits = QrCode . getNumDataCodewords ( version , ecl ) * 8 ;
var bb = new BitBuffer ( ) ;
segs . forEach ( function ( seg ) {
bb . appendBits ( seg . getMode ( ) . getModeBits ( ) , 4 ) ;
bb . appendBits ( seg . getNumChars ( ) , seg . getMode ( ) . numCharCountBits ( version ) ) ;
bb . appendData ( seg ) ;
} ) ;
// Add terminator and pad up to a byte if applicable
bb . appendBits ( 0 , Math . min ( 4 , dataCapacityBits - bb . bitLength ( ) ) ) ;
bb . appendBits ( 0 , ( 8 - bb . bitLength ( ) % 8 ) % 8 ) ;
// Pad with alternate bytes until data capacity is reached
for ( var padByte = 0xEC ; bb . bitLength ( ) < dataCapacityBits ; padByte ^= 0xEC ^ 0x11 )
bb . appendBits ( padByte , 8 ) ;
if ( bb . bitLength ( ) % 8 != 0 )
throw "Assertion error" ;
// Create the QR Code symbol
return new this ( bb . getBytes ( ) , mask , version , ecl ) ;
} ;
/*---- Private static helper functions ----*/
var QrCode = { } ; // Private object to assign properties to
Nayuki Minase
9 years ago