| /* GENERATED SOURCE. DO NOT MODIFY. */ |
| package com.android.internal.org.bouncycastle.util.encoders; |
| |
| import java.io.IOException; |
| import java.io.OutputStream; |
| |
| /** |
| * A streaming Hex encoder. |
| * @hide This class is not part of the Android public SDK API |
| */ |
| public class HexEncoder |
| implements Encoder |
| { |
| protected final byte[] encodingTable = |
| { |
| (byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5', (byte)'6', (byte)'7', |
| (byte)'8', (byte)'9', (byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f' |
| }; |
| |
| /* |
| * set up the decoding table. |
| */ |
| protected final byte[] decodingTable = new byte[128]; |
| |
| protected void initialiseDecodingTable() |
| { |
| for (int i = 0; i < decodingTable.length; i++) |
| { |
| decodingTable[i] = (byte)0xff; |
| } |
| |
| for (int i = 0; i < encodingTable.length; i++) |
| { |
| decodingTable[encodingTable[i]] = (byte)i; |
| } |
| |
| decodingTable['A'] = decodingTable['a']; |
| decodingTable['B'] = decodingTable['b']; |
| decodingTable['C'] = decodingTable['c']; |
| decodingTable['D'] = decodingTable['d']; |
| decodingTable['E'] = decodingTable['e']; |
| decodingTable['F'] = decodingTable['f']; |
| } |
| |
| public HexEncoder() |
| { |
| initialiseDecodingTable(); |
| } |
| |
| public int encode(byte[] inBuf, int inOff, int inLen, byte[] outBuf, int outOff) throws IOException |
| { |
| int inPos = inOff; |
| int inEnd = inOff + inLen; |
| int outPos = outOff; |
| |
| while (inPos < inEnd) |
| { |
| int b = inBuf[inPos++] & 0xFF; |
| |
| outBuf[outPos++] = encodingTable[b >>> 4]; |
| outBuf[outPos++] = encodingTable[b & 0xF]; |
| } |
| |
| return outPos - outOff; |
| } |
| |
| /** |
| * encode the input data producing a Hex output stream. |
| * |
| * @return the number of bytes produced. |
| */ |
| public int encode(byte[] buf, int off, int len, OutputStream out) |
| throws IOException |
| { |
| byte[] tmp = new byte[72]; |
| while (len > 0) |
| { |
| int inLen = Math.min(36, len); |
| int outLen = encode(buf, off, inLen, tmp, 0); |
| out.write(tmp, 0, outLen); |
| off += inLen; |
| len -= inLen; |
| } |
| return len * 2; |
| } |
| |
| private static boolean ignore( |
| char c) |
| { |
| return c == '\n' || c =='\r' || c == '\t' || c == ' '; |
| } |
| |
| /** |
| * decode the Hex encoded byte data writing it to the given output stream, |
| * whitespace characters will be ignored. |
| * |
| * @return the number of bytes produced. |
| */ |
| public int decode( |
| byte[] data, |
| int off, |
| int length, |
| OutputStream out) |
| throws IOException |
| { |
| byte b1, b2; |
| int outLen = 0; |
| byte[] buf = new byte[36]; |
| int bufOff = 0; |
| |
| int end = off + length; |
| |
| while (end > off) |
| { |
| if (!ignore((char)data[end - 1])) |
| { |
| break; |
| } |
| |
| end--; |
| } |
| |
| int i = off; |
| while (i < end) |
| { |
| while (i < end && ignore((char)data[i])) |
| { |
| i++; |
| } |
| |
| b1 = decodingTable[data[i++]]; |
| |
| while (i < end && ignore((char)data[i])) |
| { |
| i++; |
| } |
| |
| b2 = decodingTable[data[i++]]; |
| |
| if ((b1 | b2) < 0) |
| { |
| throw new IOException("invalid characters encountered in Hex data"); |
| } |
| |
| buf[bufOff++] = (byte)((b1 << 4) | b2); |
| |
| if (bufOff == buf.length) |
| { |
| out.write(buf); |
| bufOff = 0; |
| } |
| outLen++; |
| } |
| |
| if (bufOff > 0) |
| { |
| out.write(buf, 0, bufOff); |
| } |
| |
| return outLen; |
| } |
| |
| /** |
| * decode the Hex encoded String data writing it to the given output stream, |
| * whitespace characters will be ignored. |
| * |
| * @return the number of bytes produced. |
| */ |
| public int decode( |
| String data, |
| OutputStream out) |
| throws IOException |
| { |
| byte b1, b2; |
| int length = 0; |
| byte[] buf = new byte[36]; |
| int bufOff = 0; |
| |
| int end = data.length(); |
| |
| while (end > 0) |
| { |
| if (!ignore(data.charAt(end - 1))) |
| { |
| break; |
| } |
| |
| end--; |
| } |
| |
| int i = 0; |
| while (i < end) |
| { |
| while (i < end && ignore(data.charAt(i))) |
| { |
| i++; |
| } |
| |
| b1 = decodingTable[data.charAt(i++)]; |
| |
| while (i < end && ignore(data.charAt(i))) |
| { |
| i++; |
| } |
| |
| b2 = decodingTable[data.charAt(i++)]; |
| |
| if ((b1 | b2) < 0) |
| { |
| throw new IOException("invalid characters encountered in Hex string"); |
| } |
| |
| buf[bufOff++] = (byte)((b1 << 4) | b2); |
| |
| if (bufOff == buf.length) |
| { |
| out.write(buf); |
| bufOff = 0; |
| } |
| |
| length++; |
| } |
| |
| if (bufOff > 0) |
| { |
| out.write(buf, 0, bufOff); |
| } |
| |
| return length; |
| } |
| |
| byte[] decodeStrict(String str, int off, int len) throws IOException |
| { |
| if (null == str) |
| { |
| throw new NullPointerException("'str' cannot be null"); |
| } |
| if (off < 0 || len < 0 || off > (str.length() - len)) |
| { |
| throw new IndexOutOfBoundsException("invalid offset and/or length specified"); |
| } |
| if (0 != (len & 1)) |
| { |
| throw new IOException("a hexadecimal encoding must have an even number of characters"); |
| } |
| |
| int resultLen = len >>> 1; |
| byte[] result = new byte[resultLen]; |
| |
| int strPos = off; |
| for (int i = 0; i < resultLen; ++i) |
| { |
| byte b1 = decodingTable[str.charAt(strPos++)]; |
| byte b2 = decodingTable[str.charAt(strPos++)]; |
| |
| int n = (b1 << 4) | b2; |
| if (n < 0) |
| { |
| throw new IOException("invalid characters encountered in Hex string"); |
| } |
| |
| result[i] = (byte)n; |
| } |
| return result; |
| } |
| } |