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15882081
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2013-04-08T14:41:54.907
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2013-04-08T14:41:54.907
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I came across a similar Problem... The class form the first post to decode/parse the PackedDecimals worked fine... but the code in Gilbert Le Blancs answer did not produce a valid output. so i fixed his code... <pre><code>public class PackedDecimal { private static final int PlusSign = 0x0C; // Plus sign private static final int MinusSign = 0x0D; // Minus private static final int NoSign = 0x0F; // Unsigned private static final int DropHO = 0xFF; // AND mask to drop HO sign bits private static final int GetLO = 0x0F; // Get only LO digit public static long parse(byte[] pdIn) throws Exception { long val = 0; // Value to return for (int i = 0; i < pdIn.length; i++) { int aByte = pdIn[i] & DropHO; // Get next 2 digits & drop sign bits if (i == pdIn.length - 1) { // last digit? int digit = aByte >> 4; // First get digit val = val * 10 + digit; log("digit=" + digit + ", val=" + val); int sign = aByte & GetLO; // now get sign if (sign == MinusSign) val = -val; else { // Do we care if there is an invalid sign? if (sign != PlusSign && sign != NoSign) { System.out.println(); for (int x = 0; x < pdIn.length; x++) { System.out.print(Integer.toString(pdIn[x] & 0x000000ff, 16)); } System.out.println(); throw new Exception("OC7"); } } } else { int digit = aByte >> 4; // HO first val = val * 10 + digit; log("digit=" + digit + ", val=" + val); digit = aByte & GetLO; // now LO val = val * 10 + digit; log("digit=" + digit + ", val=" + val); } } return val; } public static byte[] format(long number, int byteCount) { byte[] bytes = new byte[byteCount]; String data = Long.toString(number); int length = data.length(); boolean isNegative = false; if (data.charAt(0) == '-') { isNegative = true; data = data.substring(1); length--; } if (length % 2 == 0) { data = "0" + data; length++; } int neededBytes = (int) (((length + 1) / 2f) + 0.5f); int extraBytes = neededBytes - byteCount; if (extraBytes < 0) { // Pad extra byte positions with zero for (int i = 0; i < -extraBytes; i++) { bytes[i] = 0x00; } } else if (extraBytes > 0) { // Truncate the high order digits of the number to fit data = data.substring(extraBytes); length -= extraBytes; extraBytes = 0; } // Translate the string digits into bytes for (int pos = 0; pos <= length - 1; pos++) { String digit = data.substring(pos, pos + 1); int now = (pos / 2) - extraBytes; if (pos % 2 == 0) { // High bytes[now] = (byte) (Byte.valueOf(digit) << 4); log("HIGH " + digit); } else { // Low bytes[now] = (byte) (bytes[now] | (Byte.valueOf(digit) & 0x0f)); log("LOW " + digit); } } // Add the sign byte if (isNegative) { bytes[byteCount - 1] = (byte) (bytes[byteCount - 1] | MinusSign); } else { bytes[byteCount - 1] = (byte) (bytes[byteCount - 1] | PlusSign); } return bytes; } private static void log(String string) { // System.out.println(string); } public static void main(String[] args) throws Exception { long price; byte[] format; price = 44981; format = PackedDecimal.format(price, 5); System.out.println("Input: " + price); System.out.println("Bytes: " + byteToString(format)); System.out.println("Result: " + PackedDecimal.parse(format)); System.out.println("---------"); price = 4498; format = PackedDecimal.format(price, 4); System.out.println("Input: " + price); System.out.println("Bytes: " + byteToString(format)); System.out.println("Result: " + PackedDecimal.parse(format)); System.out.println("---------"); price = 1337; format = PackedDecimal.format(price, 3); System.out.println("Input: " + price); System.out.println("Bytes: " + byteToString(format)); System.out.println("Result: " + PackedDecimal.parse(format)); System.out.println("---------"); } public static String byteToString(byte[] b) { StringBuilder sb = new StringBuilder(); for (int i = 0; i < b.length; i++) { int curByte = b[i] & 0xFF; sb.append("0x"); if (curByte <= 0x0F) { sb.append("0"); } sb.append(Integer.toString(curByte, 16)); sb.append(" "); } return sb.toString().trim(); } } </code></pre> The results: <pre><code>Input: 44981 Bytes: 0x00 0x00 0x44 0x98 0x1c Result: 44981 --------- Input: 4498 Bytes: 0x00 0x04 0x49 0x8c Result: 4498 --------- Input: 1337 Bytes: 0x01 0x33 0x7c Result: 1337 --------- </code></pre> Have fun & enjoy
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1. POJava: Convert String to packed decimal
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1. USDodge
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