+++ /dev/null
-/*\r
-* Copyright 2007 ZXing authors\r
-*\r
-* Licensed under the Apache License, Version 2.0 (the "License");\r
-* you may not use this file except in compliance with the License.\r
-* You may obtain a copy of the License at\r
-*\r
-* http://www.apache.org/licenses/LICENSE-2.0\r
-*\r
-* Unless required by applicable law or agreed to in writing, software\r
-* distributed under the License is distributed on an "AS IS" BASIS,\r
-* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r
-* See the License for the specific language governing permissions and\r
-* limitations under the License.\r
-*/\r
-using System;\r
-using com.google.zxing;\r
-using com.google.zxing.common;\r
-\r
-namespace com.google.zxing.qrcode.decoder\r
-{\r
- public sealed class FormatInformation\r
- { \r
- private static int FORMAT_INFO_MASK_QR = 0x5412;\r
- /**\r
- * See ISO 18004:2006, Annex C, Table C.1\r
- */\r
- private static readonly int[][] FORMAT_INFO_DECODE_LOOKUP = new int[][] { new int[] { 0x5412, 0x00 }, new int[] { 0x5125, 0x01 }, new int[] { 0x5E7C, 0x02 }, new int[] { 0x5B4B, 0x03 }, new int[] { 0x45F9, 0x04 }, new int[] { 0x40CE, 0x05 }, new int[] { 0x4F97, 0x06 }, new int[] { 0x4AA0, 0x07 }, new int[] { 0x77C4, 0x08 }, new int[] { 0x72F3, 0x09 }, new int[] { 0x7DAA, 0x0A }, new int[] { 0x789D, 0x0B }, new int[] { 0x662F, 0x0C }, new int[] { 0x6318, 0x0D }, new int[] { 0x6C41, 0x0E }, new int[] { 0x6976, 0x0F }, new int[] { 0x1689, 0x10 }, new int[] { 0x13BE, 0x11 }, new int[] { 0x1CE7, 0x12 }, new int[] { 0x19D0, 0x13 }, new int[] { 0x0762, 0x14 }, new int[] { 0x0255, 0x15 }, new int[] { 0x0D0C, 0x16 }, new int[] { 0x083B, 0x17 }, new int[] { 0x355F, 0x18 }, new int[] { 0x3068, 0x19 }, new int[] { 0x3F31, 0x1A }, new int[] { 0x3A06, 0x1B }, new int[] { 0x24B4, 0x1C }, new int[] { 0x2183, 0x1D }, new int[] { 0x2EDA, 0x1E }, new int[] { 0x2BED, 0x1F } };\r
- \r
- /**\r
- * Offset i holds the number of 1 bits in the binary representation of i\r
- */\r
- private static int[] BITS_SET_IN_HALF_BYTE =\r
- {0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4};\r
-\r
- private ErrorCorrectionLevel errorCorrectionLevel;\r
- private byte dataMask;\r
-\r
- private FormatInformation(int formatInfo) {\r
- // Bits 3,4\r
- errorCorrectionLevel = ErrorCorrectionLevel.forBits((formatInfo >> 3) & 0x03);\r
- // Bottom 3 bits\r
- dataMask = (byte) (formatInfo & 0x07);\r
- }\r
-\r
- public static int numBitsDiffering(int a, int b) {\r
- a ^= b; // a now has a 1 bit exactly where its bit differs with b's\r
- // Count bits set quickly with a series of lookups:\r
- return BITS_SET_IN_HALF_BYTE[a & 0x0F] + BITS_SET_IN_HALF_BYTE[(SupportClass.URShift(a, 4) & 0x0F)] + BITS_SET_IN_HALF_BYTE[(SupportClass.URShift(a, 8) & 0x0F)] + BITS_SET_IN_HALF_BYTE[(SupportClass.URShift(a, 12) & 0x0F)] + BITS_SET_IN_HALF_BYTE[(SupportClass.URShift(a, 16) & 0x0F)] + BITS_SET_IN_HALF_BYTE[(SupportClass.URShift(a, 20) & 0x0F)] + BITS_SET_IN_HALF_BYTE[(SupportClass.URShift(a, 24) & 0x0F)] + BITS_SET_IN_HALF_BYTE[(SupportClass.URShift(a, 28) & 0x0F)];\r
- }\r
-\r
- /**\r
- * @param rawFormatInfo\r
- * @return\r
- */\r
- public static FormatInformation decodeFormatInformation(int rawFormatInfo){\r
- try{\r
- FormatInformation formatInfo = doDecodeFormatInformation(rawFormatInfo);\r
- if (formatInfo != null) {\r
- return formatInfo;\r
- }\r
- // Should return null, but, some QR codes apparently\r
- // do not mask this info. Try again, first masking the raw bits so\r
- // the function will unmask\r
- return doDecodeFormatInformation(rawFormatInfo ^ FORMAT_INFO_MASK_QR);\r
- }catch(Exception e){\r
- throw new ReaderException(e.Message);\r
- } \r
- }\r
-\r
- private static FormatInformation doDecodeFormatInformation(int rawFormatInfo) {\r
- // Unmask:\r
- int unmaskedFormatInfo = rawFormatInfo ^ FORMAT_INFO_MASK_QR;\r
- // Find the int in FORMAT_INFO_DECODE_LOOKUP with fewest bits differing\r
- int bestDifference = int.MaxValue;\r
- int bestFormatInfo = 0;\r
- for (int i = 0; i < FORMAT_INFO_DECODE_LOOKUP.Length; i++) {\r
- int[] decodeInfo = FORMAT_INFO_DECODE_LOOKUP[i];\r
- int targetInfo = decodeInfo[0];\r
- if (targetInfo == unmaskedFormatInfo) {\r
- // Found an exact match\r
- return new FormatInformation(decodeInfo[1]);\r
- }\r
- int bitsDifference = numBitsDiffering(unmaskedFormatInfo, targetInfo);\r
- if (bitsDifference < bestDifference) {\r
- bestFormatInfo = decodeInfo[1];\r
- bestDifference = bitsDifference;\r
- }\r
- }\r
- if (bestDifference <= 3) {\r
- return new FormatInformation(bestFormatInfo);\r
- }\r
- return null;\r
- }\r
-\r
- public ErrorCorrectionLevel getErrorCorrectionLevel() {\r
- return errorCorrectionLevel;\r
- }\r
-\r
- public byte getDataMask() {\r
- return dataMask;\r
- }\r
-\r
- public int hashCode() {\r
- return (errorCorrectionLevel.ordinal() << 3) | (int) dataMask;\r
- }\r
-\r
- public bool equals(Object o) {\r
- if (!(o.GetType() == typeof(FormatInformation))){\r
- return false;\r
- }\r
- FormatInformation other = (FormatInformation) o;\r
- return this.errorCorrectionLevel == other.errorCorrectionLevel &&\r
- this.dataMask == other.dataMask;\r
- }\r
- \r
- }\r
-}
\ No newline at end of file
projects / zxing.git / blobdiff