更新

2026-08-11 17:41:36 +08:00
parent cfe4c82c90
commit 03fe4ddf9d
18771 changed files with 3617239 additions and 0 deletions
@@ -0,0 +1,121 @@
+/*
+  Ported to JavaScript by Lazar Laszlo 2011
+
+  lazarsoft@gmail.com, www.lazarsoft.info
+
+*/
+
+/*
+*
+* Copyright 2007 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.
+*/
+
+import {URShift} from './qrcode';
+import ErrorCorrectionLevel from './errorlevel';
+
+var FORMAT_INFO_MASK_QR = 0x5412;
+var FORMAT_INFO_DECODE_LOOKUP = [
+  [0x5412, 0x00],
+  [0x5125, 0x01],
+  [0x5E7C, 0x02],
+  [0x5B4B, 0x03],
+  [0x45F9, 0x04],
+  [0x40CE, 0x05],
+  [0x4F97, 0x06],
+  [0x4AA0, 0x07],
+  [0x77C4, 0x08],
+  [0x72F3, 0x09],
+  [0x7DAA, 0x0A],
+  [0x789D, 0x0B],
+  [0x662F, 0x0C],
+  [0x6318, 0x0D],
+  [0x6C41, 0x0E],
+  [0x6976, 0x0F],
+  [0x1689, 0x10],
+  [0x13BE, 0x11],
+  [0x1CE7, 0x12],
+  [0x19D0, 0x13],
+  [0x0762, 0x14],
+  [0x0255, 0x15],
+  [0x0D0C, 0x16],
+  [0x083B, 0x17],
+  [0x355F, 0x18],
+  [0x3068, 0x19],
+  [0x3F31, 0x1A],
+  [0x3A06, 0x1B],
+  [0x24B4, 0x1C],
+  [0x2183, 0x1D],
+  [0x2EDA, 0x1E],
+  [0x2BED, 0x1F],
+];
+var BITS_SET_IN_HALF_BYTE = [0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4];
+
+
+export default function FormatInformation(formatInfo) {
+  this.errorCorrectionLevel = ErrorCorrectionLevel.forBits((formatInfo >> 3) & 0x03);
+  this.dataMask =  (formatInfo & 0x07);
+}
+
+FormatInformation.prototype.GetHashCode = function() {
+  return (this.errorCorrectionLevel.ordinal() << 3) |  this.dataMask;
+};
+
+FormatInformation.prototype.Equals = function(o) {
+  var other =  o;
+  return this.errorCorrectionLevel == other.errorCorrectionLevel && this.dataMask == other.dataMask;
+};
+
+FormatInformation.numBitsDiffering = function(a,  b) {
+  a ^= b; // a now has a 1 bit exactly where its bit differs with b's
+  // Count bits set quickly with a series of lookups:
+  return BITS_SET_IN_HALF_BYTE[a & 0x0F] + BITS_SET_IN_HALF_BYTE[(URShift(a, 4) & 0x0F)] + BITS_SET_IN_HALF_BYTE[(URShift(a, 8) & 0x0F)] + BITS_SET_IN_HALF_BYTE[(URShift(a, 12) & 0x0F)] + BITS_SET_IN_HALF_BYTE[(URShift(a, 16) & 0x0F)] + BITS_SET_IN_HALF_BYTE[(URShift(a, 20) & 0x0F)] + BITS_SET_IN_HALF_BYTE[(URShift(a, 24) & 0x0F)] + BITS_SET_IN_HALF_BYTE[(URShift(a, 28) & 0x0F)];
+};
+
+FormatInformation.decodeFormatInformation = function(maskedFormatInfo) {
+  var formatInfo = FormatInformation.doDecodeFormatInformation(maskedFormatInfo);
+  if (formatInfo != null) {
+    return formatInfo;
+  }
+  // Should return null, but, some QR codes apparently
+  // do not mask this info. Try again by actually masking the pattern
+  // first
+  return FormatInformation.doDecodeFormatInformation(maskedFormatInfo ^ FORMAT_INFO_MASK_QR);
+};
+FormatInformation.doDecodeFormatInformation = function(maskedFormatInfo) {
+  // Find the int in FORMAT_INFO_DECODE_LOOKUP with fewest bits differing
+  var bestDifference = 0xffffffff;
+  var bestFormatInfo = 0;
+  for (var i = 0; i < FORMAT_INFO_DECODE_LOOKUP.length; i++) {
+    var decodeInfo = FORMAT_INFO_DECODE_LOOKUP[i];
+    var targetInfo = decodeInfo[0];
+    if (targetInfo == maskedFormatInfo) {
+      // Found an exact match
+      return new FormatInformation(decodeInfo[1]);
+    }
+    var bitsDifference = this.numBitsDiffering(maskedFormatInfo, targetInfo);
+    if (bitsDifference < bestDifference) {
+      bestFormatInfo = decodeInfo[1];
+      bestDifference = bitsDifference;
+    }
+  }
+  // Hamming distance of the 32 masked codes is 7, by construction, so <= 3 bits
+  // differing means we found a match
+  if (bestDifference <= 3) {
+    return new FormatInformation(bestFormatInfo);
+  }
+  return null;
+};
+
+