-/*\r
+/*\r
+* Copyright 2008 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
* See the License for the specific language governing permissions and\r
* limitations under the License.\r
*/\r
+using System;\r
+using BarcodeFormat = com.google.zxing.BarcodeFormat;\r
+using ReaderException = com.google.zxing.ReaderException;\r
+using Result = com.google.zxing.Result;\r
+using ResultPoint = com.google.zxing.ResultPoint;\r
+using BitArray = com.google.zxing.common.BitArray;\r
namespace com.google.zxing.oned\r
{\r
- using System;\r
- using System.Text;\r
- using com.google.zxing.common;\r
-\r
-\r
- public sealed class Code39Reader : AbstractOneDReader \r
- { \r
- private static String ALPHABET_STRING = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. *$/+%";\r
- private static char[] ALPHABET = ALPHABET_STRING.ToCharArray();\r
-\r
- /**\r
- * These represent the encodings of characters, as patterns of wide and narrow bars.\r
- * The 9 least-significant bits of each int correspond to the pattern of wide and narrow,\r
- * with 1s representing "wide" and 0s representing narrow.\r
- */\r
- private static int[] CHARACTER_ENCODINGS = {\r
- 0x034, 0x121, 0x061, 0x160, 0x031, 0x130, 0x070, 0x025, 0x124, 0x064, // 0-9\r
- 0x109, 0x049, 0x148, 0x019, 0x118, 0x058, 0x00D, 0x10C, 0x04C, 0x01C, // A-J\r
- 0x103, 0x043, 0x142, 0x013, 0x112, 0x052, 0x007, 0x106, 0x046, 0x016, // K-T\r
- 0x181, 0x0C1, 0x1C0, 0x091, 0x190, 0x0D0, 0x085, 0x184, 0x0C4, 0x094, // U-*\r
- 0x0A8, 0x0A2, 0x08A, 0x02A // $-%\r
- };\r
-\r
- private static int ASTERISK_ENCODING = CHARACTER_ENCODINGS[39];\r
-\r
- private bool usingCheckDigit;\r
- private bool extendedMode;\r
-\r
- /**\r
- * Creates a reader that assumes all encoded data is data, and does not treat the \r
- * character as a check digit. It will not decoded "extended Code 39" sequences.\r
- */\r
- public Code39Reader() {\r
- usingCheckDigit = false;\r
- extendedMode = false;\r
- }\r
-\r
- /**\r
- * Creates a reader that can be configured to check the last character as a check digit.\r
- * It will not decoded "extended Code 39" sequences.\r
- *\r
- * @param usingCheckDigit if true, treat the last data character as a check digit, not\r
- * data, and verify that the checksum passes.\r
- */\r
- public Code39Reader(bool usingCheckDigit) {\r
- this.usingCheckDigit = usingCheckDigit;\r
- this.extendedMode = false;\r
- }\r
-\r
- /**\r
- * Creates a reader that can be configured to check the last character as a check digit,\r
- * or optionally attempt to decode "extended Code 39" sequences that are used to encode\r
- * the full ASCII character set.\r
- *\r
- * @param usingCheckDigit if true, treat the last data character as a check digit, not\r
- * data, and verify that the checksum passes.\r
- * @param extendedMode if true, will attempt to decode extended Code 39 sequences in the\r
- * text.\r
- */\r
- public Code39Reader(bool usingCheckDigit, bool extendedMode) {\r
- this.usingCheckDigit = usingCheckDigit;\r
- this.extendedMode = extendedMode;\r
- }\r
-\r
- public override Result decodeRow(int rowNumber, BitArray row, System.Collections.Hashtable hints) {\r
-\r
- int[] start = findAsteriskPattern(row);\r
- int nextStart = start[1];\r
- int end = row.getSize();\r
-\r
- // Read off white space\r
- while (nextStart < end && !row.get(nextStart)) {\r
- nextStart++;\r
- }\r
-\r
- StringBuilder result = new StringBuilder();\r
- int[] counters = new int[9];\r
- char decodedChar;\r
- int lastStart;\r
- do {\r
- recordPattern(row, nextStart, counters);\r
- int pattern = toNarrowWidePattern(counters);\r
- decodedChar = patternToChar(pattern);\r
- result.Append(decodedChar);\r
- lastStart = nextStart;\r
- for (int i = 0; i < counters.Length; i++) {\r
- nextStart += counters[i];\r
- }\r
- // Read off white space\r
- while (nextStart < end && !row.get(nextStart)) {\r
- nextStart++;\r
- }\r
- } while (decodedChar != '*');\r
-\r
- result.Remove(result.Length - 1, 1); // remove asterisk\r
-\r
- // Look for whitespace after pattern:\r
- int lastPatternSize = 0;\r
- for (int i = 0; i < counters.Length; i++) {\r
- lastPatternSize += counters[i];\r
- }\r
- int whiteSpaceAfterEnd = nextStart - lastStart - lastPatternSize;\r
- // If 50% of last pattern size, following last pattern, is not whitespace, fail\r
- // (but if it's whitespace to the very end of the image, that's OK)\r
- if (nextStart != end && whiteSpaceAfterEnd / 2 < lastPatternSize) {\r
- throw new ReaderException();\r
- }\r
-\r
- if (usingCheckDigit) {\r
- int max = result.Length - 1;\r
- int total = 0;\r
- for (int i = 0; i < max; i++) {\r
- total += ALPHABET_STRING.IndexOf(result[i]);\r
- }\r
- if (total % 43 != ALPHABET_STRING.IndexOf(result[max]))\r
- {\r
- throw new ReaderException();\r
- }\r
- result.Remove(max,1);\r
- }\r
-\r
- String resultString = result.ToString();\r
- if (extendedMode) {\r
- resultString = decodeExtended(resultString);\r
- }\r
-\r
- if (resultString.Length == 0) {\r
- // Almost surely a false positive\r
- throw new ReaderException();\r
- }\r
-\r
- float left = (float) (start[1] + start[0]) / 2.0f;\r
- float right = (float) (nextStart + lastStart) / 2.0f;\r
- return new Result(\r
- resultString,\r
- null,\r
- new ResultPoint[]{\r
- new GenericResultPoint(left, (float) rowNumber),\r
- new GenericResultPoint(right, (float) rowNumber)},\r
- BarcodeFormat.CODE_39);\r
-\r
- }\r
-\r
- private static int[] findAsteriskPattern(BitArray row) {\r
- int width = row.getSize();\r
- int rowOffset = 0;\r
- while (rowOffset < width) {\r
- if (row.get(rowOffset)) {\r
- break;\r
- }\r
- rowOffset++;\r
- }\r
-\r
- int counterPosition = 0;\r
- int[] counters = new int[9];\r
- int patternStart = rowOffset;\r
- bool isWhite = false;\r
- int patternLength = counters.Length;\r
-\r
- for (int i = rowOffset; i < width; i++) {\r
- bool pixel = row.get(i);\r
- if ((!pixel && isWhite) || (pixel && !isWhite)) {\r
- counters[counterPosition]++;\r
- } else {\r
- if (counterPosition == patternLength - 1) {\r
- try {\r
- if (toNarrowWidePattern(counters) == ASTERISK_ENCODING) {\r
- // Look for whitespace before start pattern, >= 50% of width of start pattern\r
- if (row.isRange(Math.Max(0, patternStart - (i - patternStart) / 2), patternStart, false)) {\r
- return new int[]{patternStart, i};\r
- }\r
- }\r
- } catch (ReaderException re) {\r
- // no match, continue\r
- }\r
- patternStart += counters[0] + counters[1];\r
- for (int y = 2; y < patternLength; y++) {\r
- counters[y - 2] = counters[y];\r
- }\r
- counters[patternLength - 2] = 0;\r
- counters[patternLength - 1] = 0;\r
- counterPosition--;\r
- } else {\r
- counterPosition++;\r
- }\r
- counters[counterPosition] = 1;\r
- isWhite = !isWhite;\r
- }\r
- }\r
- throw new ReaderException();\r
- }\r
-\r
- private static int toNarrowWidePattern(int[] counters) {\r
- int numCounters = counters.Length;\r
- int maxNarrowCounter = 0;\r
- int wideCounters;\r
- do {\r
- int minCounter = int.MaxValue;\r
- for (int i = 0; i < numCounters; i++) {\r
- int counter = counters[i];\r
- if (counter < minCounter && counter > maxNarrowCounter) {\r
- minCounter = counter;\r
- }\r
- }\r
- maxNarrowCounter = minCounter;\r
- wideCounters = 0;\r
- int totalWideCountersWidth = 0;\r
- int pattern = 0;\r
- for (int i = 0; i < numCounters; i++) {\r
- int counter = counters[i];\r
- if (counters[i] > maxNarrowCounter) {\r
- pattern |= 1 << (numCounters - 1 - i);\r
- wideCounters++;\r
- totalWideCountersWidth += counter;\r
- }\r
- }\r
- if (wideCounters == 3) {\r
- // Found 3 wide counters, but are they close enough in width?\r
- // We can perform a cheap, conservative check to see if any individual\r
- // counter is more than 1.5 times the average:\r
- for (int i = 0; i < numCounters && wideCounters > 0; i++) {\r
- int counter = counters[i];\r
- if (counters[i] > maxNarrowCounter) {\r
- wideCounters--;\r
- // totalWideCountersWidth = 3 * average, so this checks if counter >= 3/2 * average\r
- if ((counter << 1) >= totalWideCountersWidth) {\r
- throw new ReaderException();\r
- }\r
- }\r
- }\r
- return pattern;\r
- }\r
- } while (wideCounters > 3);\r
- throw new ReaderException();\r
- }\r
-\r
- private static char patternToChar(int pattern) {\r
- for (int i = 0; i < CHARACTER_ENCODINGS.Length; i++) {\r
- if (CHARACTER_ENCODINGS[i] == pattern) {\r
- return ALPHABET[i];\r
- }\r
- }\r
- throw new ReaderException();\r
- }\r
-\r
- private static String decodeExtended(String encoded) {\r
- int Length = encoded.Length;\r
- StringBuilder decoded = new StringBuilder(Length);\r
- for (int i = 0; i < Length; i++) {\r
- char c = encoded[i];\r
- if (c == '+' || c == '$' || c == '%' || c == '/') {\r
- char next = encoded[i + 1];\r
- char decodedChar = '\0';\r
- switch (c) {\r
- case '+':\r
- // +A to +Z map to a to z\r
- if (next >= 'A' && next <= 'Z') {\r
- decodedChar = (char) (next + 32);\r
- } else {\r
- throw new ReaderException();\r
- }\r
- break;\r
- case '$':\r
- // $A to $Z map to control codes SH to SB\r
- if (next >= 'A' && next <= 'Z') {\r
- decodedChar = (char) (next - 64);\r
- } else {\r
- throw new ReaderException();\r
- }\r
- break;\r
- case '%':\r
- // %A to %E map to control codes ESC to US\r
- if (next >= 'A' && next <= 'E') {\r
- decodedChar = (char) (next - 38);\r
- } else if (next >= 'F' && next <= 'W') {\r
- decodedChar = (char) (next - 11);\r
- } else {\r
- throw new ReaderException();\r
- }\r
- break;\r
- case '/':\r
- // /A to /O map to ! to , and /Z maps to :\r
- if (next >= 'A' && next <= 'O') {\r
- decodedChar = (char) (next - 32);\r
- } else if (next == 'Z') {\r
- decodedChar = ':';\r
- } else {\r
- throw new ReaderException();\r
- }\r
- break;\r
- }\r
- decoded.Append(decodedChar);\r
- // bump up i again since we read two characters\r
- i++;\r
- } else {\r
- decoded.Append(c);\r
- }\r
- }\r
- return decoded.ToString();\r
- }\r
-\r
- \r
- }\r
+ \r
+ /// <summary> <p>Decodes Code 39 barcodes. This does not support "Full ASCII Code 39" yet.</p>\r
+ /// \r
+ /// </summary>\r
+ /// <author> Sean Owen\r
+ /// </author>\r
+ /// <author>www.Redivivus.in (suraj.supekar@redivivus.in) - Ported from ZXING Java Source \r
+ /// </author>\r
+ public sealed class Code39Reader:OneDReader\r
+ {\r
+ \r
+ private const System.String ALPHABET_STRING = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. *$/+%";\r
+ //UPGRADE_NOTE: Final was removed from the declaration of 'ALPHABET '. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"\r
+ private static readonly char[] ALPHABET = ALPHABET_STRING.ToCharArray();\r
+ \r
+ /// <summary> These represent the encodings of characters, as patterns of wide and narrow bars.\r
+ /// The 9 least-significant bits of each int correspond to the pattern of wide and narrow,\r
+ /// with 1s representing "wide" and 0s representing narrow.\r
+ /// </summary>\r
+ //UPGRADE_NOTE: Final was removed from the declaration of 'CHARACTER_ENCODINGS'. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"\r
+ private static readonly int[] CHARACTER_ENCODINGS = new int[]{0x034, 0x121, 0x061, 0x160, 0x031, 0x130, 0x070, 0x025, 0x124, 0x064, 0x109, 0x049, 0x148, 0x019, 0x118, 0x058, 0x00D, 0x10C, 0x04C, 0x01C, 0x103, 0x043, 0x142, 0x013, 0x112, 0x052, 0x007, 0x106, 0x046, 0x016, 0x181, 0x0C1, 0x1C0, 0x091, 0x190, 0x0D0, 0x085, 0x184, 0x0C4, 0x094, 0x0A8, 0x0A2, 0x08A, 0x02A};\r
+ \r
+ //UPGRADE_NOTE: Final was removed from the declaration of 'ASTERISK_ENCODING '. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"\r
+ private static readonly int ASTERISK_ENCODING = CHARACTER_ENCODINGS[39];\r
+ \r
+ //UPGRADE_NOTE: Final was removed from the declaration of 'usingCheckDigit '. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"\r
+ private bool usingCheckDigit;\r
+ //UPGRADE_NOTE: Final was removed from the declaration of 'extendedMode '. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"\r
+ private bool extendedMode;\r
+ \r
+ /// <summary> Creates a reader that assumes all encoded data is data, and does not treat the final\r
+ /// character as a check digit. It will not decoded "extended Code 39" sequences.\r
+ /// </summary>\r
+ public Code39Reader()\r
+ {\r
+ usingCheckDigit = false;\r
+ extendedMode = false;\r
+ }\r
+ \r
+ /// <summary> Creates a reader that can be configured to check the last character as a check digit.\r
+ /// It will not decoded "extended Code 39" sequences.\r
+ /// \r
+ /// </summary>\r
+ /// <param name="usingCheckDigit">if true, treat the last data character as a check digit, not\r
+ /// data, and verify that the checksum passes.\r
+ /// </param>\r
+ public Code39Reader(bool usingCheckDigit)\r
+ {\r
+ this.usingCheckDigit = usingCheckDigit;\r
+ this.extendedMode = false;\r
+ }\r
+ \r
+ /// <summary> Creates a reader that can be configured to check the last character as a check digit,\r
+ /// or optionally attempt to decode "extended Code 39" sequences that are used to encode\r
+ /// the full ASCII character set.\r
+ /// \r
+ /// </summary>\r
+ /// <param name="usingCheckDigit">if true, treat the last data character as a check digit, not\r
+ /// data, and verify that the checksum passes.\r
+ /// </param>\r
+ /// <param name="extendedMode">if true, will attempt to decode extended Code 39 sequences in the\r
+ /// text.\r
+ /// </param>\r
+ public Code39Reader(bool usingCheckDigit, bool extendedMode)\r
+ {\r
+ this.usingCheckDigit = usingCheckDigit;\r
+ this.extendedMode = extendedMode;\r
+ }\r
+ \r
+ public override Result decodeRow(int rowNumber, BitArray row, System.Collections.Hashtable hints)\r
+ {\r
+ \r
+ int[] start = findAsteriskPattern(row);\r
+ int nextStart = start[1];\r
+ int end = row.Size;\r
+ \r
+ // Read off white space\r
+ while (nextStart < end && !row.get_Renamed(nextStart))\r
+ {\r
+ nextStart++;\r
+ }\r
+ \r
+ System.Text.StringBuilder result = new System.Text.StringBuilder(20);\r
+ int[] counters = new int[9];\r
+ char decodedChar;\r
+ int lastStart;\r
+ do \r
+ {\r
+ recordPattern(row, nextStart, counters);\r
+ int pattern = toNarrowWidePattern(counters);\r
+ if (pattern < 0)\r
+ {\r
+ throw ReaderException.Instance;\r
+ }\r
+ decodedChar = patternToChar(pattern);\r
+ result.Append(decodedChar);\r
+ lastStart = nextStart;\r
+ for (int i = 0; i < counters.Length; i++)\r
+ {\r
+ nextStart += counters[i];\r
+ }\r
+ // Read off white space\r
+ while (nextStart < end && !row.get_Renamed(nextStart))\r
+ {\r
+ nextStart++;\r
+ }\r
+ }\r
+ while (decodedChar != '*');\r
+ result.Remove(result.Length - 1, 1); // remove asterisk\r
+ \r
+ // Look for whitespace after pattern:\r
+ int lastPatternSize = 0;\r
+ for (int i = 0; i < counters.Length; i++)\r
+ {\r
+ lastPatternSize += counters[i];\r
+ }\r
+ int whiteSpaceAfterEnd = nextStart - lastStart - lastPatternSize;\r
+ // If 50% of last pattern size, following last pattern, is not whitespace, fail\r
+ // (but if it's whitespace to the very end of the image, that's OK)\r
+ if (nextStart != end && whiteSpaceAfterEnd / 2 < lastPatternSize)\r
+ {\r
+ throw ReaderException.Instance;\r
+ }\r
+ \r
+ if (usingCheckDigit)\r
+ {\r
+ int max = result.Length - 1;\r
+ int total = 0;\r
+ for (int i = 0; i < max; i++)\r
+ {\r
+ total += ALPHABET_STRING.IndexOf((System.Char) result[i]);\r
+ }\r
+ if (total % 43 != ALPHABET_STRING.IndexOf((System.Char) result[max]))\r
+ {\r
+ throw ReaderException.Instance;\r
+ }\r
+ result.Remove(max, 1);\r
+ }\r
+ \r
+ System.String resultString = result.ToString();\r
+ if (extendedMode)\r
+ {\r
+ resultString = decodeExtended(resultString);\r
+ }\r
+ \r
+ if (resultString.Length == 0)\r
+ {\r
+ // Almost surely a false positive\r
+ throw ReaderException.Instance;\r
+ }\r
+ \r
+ //UPGRADE_WARNING: Data types in Visual C# might be different. Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"\r
+ float left = (float) (start[1] + start[0]) / 2.0f;\r
+ //UPGRADE_WARNING: Data types in Visual C# might be different. Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"\r
+ float right = (float) (nextStart + lastStart) / 2.0f;\r
+ //UPGRADE_WARNING: Data types in Visual C# might be different. Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"\r
+ return new Result(resultString, null, new ResultPoint[]{new ResultPoint(left, (float) rowNumber), new ResultPoint(right, (float) rowNumber)}, BarcodeFormat.CODE_39);\r
+ }\r
+ \r
+ private static int[] findAsteriskPattern(BitArray row)\r
+ {\r
+ int width = row.Size;\r
+ int rowOffset = 0;\r
+ while (rowOffset < width)\r
+ {\r
+ if (row.get_Renamed(rowOffset))\r
+ {\r
+ break;\r
+ }\r
+ rowOffset++;\r
+ }\r
+ \r
+ int counterPosition = 0;\r
+ int[] counters = new int[9];\r
+ int patternStart = rowOffset;\r
+ bool isWhite = false;\r
+ int patternLength = counters.Length;\r
+ \r
+ for (int i = rowOffset; i < width; i++)\r
+ {\r
+ bool pixel = row.get_Renamed(i);\r
+ if (pixel ^ isWhite)\r
+ {\r
+ counters[counterPosition]++;\r
+ }\r
+ else\r
+ {\r
+ if (counterPosition == patternLength - 1)\r
+ {\r
+ if (toNarrowWidePattern(counters) == ASTERISK_ENCODING)\r
+ {\r
+ // Look for whitespace before start pattern, >= 50% of width of start pattern\r
+ if (row.isRange(System.Math.Max(0, patternStart - (i - patternStart) / 2), patternStart, false))\r
+ {\r
+ return new int[]{patternStart, i};\r
+ }\r
+ }\r
+ patternStart += counters[0] + counters[1];\r
+ for (int y = 2; y < patternLength; y++)\r
+ {\r
+ counters[y - 2] = counters[y];\r
+ }\r
+ counters[patternLength - 2] = 0;\r
+ counters[patternLength - 1] = 0;\r
+ counterPosition--;\r
+ }\r
+ else\r
+ {\r
+ counterPosition++;\r
+ }\r
+ counters[counterPosition] = 1;\r
+ isWhite = !isWhite;\r
+ }\r
+ }\r
+ throw ReaderException.Instance;\r
+ }\r
+ \r
+ // For efficiency, returns -1 on failure. Not throwing here saved as many as 700 exceptions\r
+ // per image when using some of our blackbox images.\r
+ private static int toNarrowWidePattern(int[] counters)\r
+ {\r
+ int numCounters = counters.Length;\r
+ int maxNarrowCounter = 0;\r
+ int wideCounters;\r
+ do \r
+ {\r
+ int minCounter = System.Int32.MaxValue;\r
+ for (int i = 0; i < numCounters; i++)\r
+ {\r
+ int counter = counters[i];\r
+ if (counter < minCounter && counter > maxNarrowCounter)\r
+ {\r
+ minCounter = counter;\r
+ }\r
+ }\r
+ maxNarrowCounter = minCounter;\r
+ wideCounters = 0;\r
+ int totalWideCountersWidth = 0;\r
+ int pattern = 0;\r
+ for (int i = 0; i < numCounters; i++)\r
+ {\r
+ int counter = counters[i];\r
+ if (counters[i] > maxNarrowCounter)\r
+ {\r
+ pattern |= 1 << (numCounters - 1 - i);\r
+ wideCounters++;\r
+ totalWideCountersWidth += counter;\r
+ }\r
+ }\r
+ if (wideCounters == 3)\r
+ {\r
+ // Found 3 wide counters, but are they close enough in width?\r
+ // We can perform a cheap, conservative check to see if any individual\r
+ // counter is more than 1.5 times the average:\r
+ for (int i = 0; i < numCounters && wideCounters > 0; i++)\r
+ {\r
+ int counter = counters[i];\r
+ if (counters[i] > maxNarrowCounter)\r
+ {\r
+ wideCounters--;\r
+ // totalWideCountersWidth = 3 * average, so this checks if counter >= 3/2 * average\r
+ if ((counter << 1) >= totalWideCountersWidth)\r
+ {\r
+ return - 1;\r
+ }\r
+ }\r
+ }\r
+ return pattern;\r
+ }\r
+ }\r
+ while (wideCounters > 3);\r
+ return - 1;\r
+ }\r
+ \r
+ private static char patternToChar(int pattern)\r
+ {\r
+ for (int i = 0; i < CHARACTER_ENCODINGS.Length; i++)\r
+ {\r
+ if (CHARACTER_ENCODINGS[i] == pattern)\r
+ {\r
+ return ALPHABET[i];\r
+ }\r
+ }\r
+ throw ReaderException.Instance;\r
+ }\r
+ \r
+ private static System.String decodeExtended(System.String encoded)\r
+ {\r
+ int length = encoded.Length;\r
+ System.Text.StringBuilder decoded = new System.Text.StringBuilder(length);\r
+ for (int i = 0; i < length; i++)\r
+ {\r
+ char c = encoded[i];\r
+ if (c == '+' || c == '$' || c == '%' || c == '/')\r
+ {\r
+ char next = encoded[i + 1];\r
+ char decodedChar = '\x0000';\r
+ switch (c)\r
+ {\r
+ \r
+ case '+': \r
+ // +A to +Z map to a to z\r
+ if (next >= 'A' && next <= 'Z')\r
+ {\r
+ decodedChar = (char) (next + 32);\r
+ }\r
+ else\r
+ {\r
+ throw ReaderException.Instance;\r
+ }\r
+ break;\r
+ \r
+ case '$': \r
+ // $A to $Z map to control codes SH to SB\r
+ if (next >= 'A' && next <= 'Z')\r
+ {\r
+ decodedChar = (char) (next - 64);\r
+ }\r
+ else\r
+ {\r
+ throw ReaderException.Instance;\r
+ }\r
+ break;\r
+ \r
+ case '%': \r
+ // %A to %E map to control codes ESC to US\r
+ if (next >= 'A' && next <= 'E')\r
+ {\r
+ decodedChar = (char) (next - 38);\r
+ }\r
+ else if (next >= 'F' && next <= 'W')\r
+ {\r
+ decodedChar = (char) (next - 11);\r
+ }\r
+ else\r
+ {\r
+ throw ReaderException.Instance;\r
+ }\r
+ break;\r
+ \r
+ case '/': \r
+ // /A to /O map to ! to , and /Z maps to :\r
+ if (next >= 'A' && next <= 'O')\r
+ {\r
+ decodedChar = (char) (next - 32);\r
+ }\r
+ else if (next == 'Z')\r
+ {\r
+ decodedChar = ':';\r
+ }\r
+ else\r
+ {\r
+ throw ReaderException.Instance;\r
+ }\r
+ break;\r
+ }\r
+ decoded.Append(decodedChar);\r
+ // bump up i again since we read two characters\r
+ i++;\r
+ }\r
+ else\r
+ {\r
+ decoded.Append(c);\r
+ }\r
+ }\r
+ return decoded.ToString();\r
+ }\r
+ }\r
}
\ No newline at end of file
projects / zxing.git / blobdiff