1 files changed, 271 insertions, 0 deletions
diff --git a/src/net/gcdc/asn1/uper/ByteBitBuffer.java b/src/net/gcdc/asn1/uper/ByteBitBuffer.java
new file mode 100644
index 0000000..e55d9d5
--- /dev/null
+++ b/src/net/gcdc/asn1/uper/ByteBitBuffer.java
@@ -0,0 +1,271 @@
+package net.gcdc.asn1.uper;
+
+
+
+public class ByteBitBuffer implements BitBuffer {
+
+    byte[] bytes;
+    byte[] mask = new byte[] {
+     (byte) 0b1000_0000,
+            0b0100_0000,
+            0b0010_0000,
+            0b0001_0000,
+            0b0000_1000,
+            0b0000_0100,
+            0b0000_0010,
+            0b0000_0001,
+    };
+
+    boolean isFinite;
+
+    int mark;
+    int position;
+    int limit;
+
+    
+    @Override public boolean get(int index) {
+        if (index < 0) {
+            throw new IndexOutOfBoundsException("Index " + index + " is less than 0");
+        } else if (index >= limit) {
+            throw new IndexOutOfBoundsException("Index " + index + " violates the limit " + limit);
+        }
+        boolean result = (bytes[index / 8] & mask[index % 8]) != 0;
+        return result;
+    }
+
+    @Override public boolean get() {
+        boolean result = get(position);
+        position++;
+        return result;
+    }
+
+    private void grow() {
+        byte[] newbytes = new byte[2 * bytes.length];
+        System.arraycopy(bytes, 0, newbytes, 0, bytes.length);
+        bytes = newbytes;
+    }
+
+    @Override public BitBuffer put(int index, boolean element) {
+        if (bytes.length <= index / 8) {
+            if (isFinite) { throw new IndexOutOfBoundsException(); }
+            else { grow(); }
+        }
+        if (element) {
+            bytes[index / 8] |= mask[index % 8];
+        } else {
+            bytes[index / 8] &= ~mask[index % 8];
+        }
+        return this;
+    }
+
+    @Override public BitBuffer put(boolean element) {
+        put(position, element);
+        position++;
+        limit = limit < position ? position : limit;  // TODO: should it be here?
+        return this;
+    }
+
+    @Override public BitBuffer putByte(byte element) {
+        for (int i = 0; i < 8; i++) {
+            put((element & mask[i]) != 0);
+        }
+        return this;
+    }
+    
+    @Override public BitBuffer putByteArray(int index, byte[] data) {
+    	
+    	for (int l = 0; l < data.length;l++) {
+    		for (int i = 0; i < 8; i++) {
+    			put((data[l] & mask[i]) != 0);
+    		}
+    	}	
+    	return this;
+    }
+    
+
+    @Override public byte getByte() {
+        byte result = 0;
+        for (int i = 0; i < 8; i++) {
+            result |= (get() ? 1 : 0) << (7 - i);
+        }
+        return result;
+    }
+
+    @Override public int limit() {
+        return limit;
+    }
+
+    @Override public String toBooleanString(int startIndex, int length) {
+        StringBuilder sb = new StringBuilder(length);
+        for (int i = startIndex; i < startIndex + length; i++) {
+            sb.append(get(i) ? "1" : "0");
+        }
+        return sb.toString();
+    }
+
+    @Override public int capacity() {
+        return isFinite ? bytes.length * 8 : Integer.MAX_VALUE;
+    }
+
+    @Override public int position() {
+        return position;
+    }
+
+    @Override public int remaining() {
+        return limit - position;
+    }
+
+    public ByteBitBuffer(byte[] backingArray) {
+        this.bytes = backingArray;
+        this.isFinite = true;
+    }
+
+    private ByteBitBuffer(int initialCapacity) {
+        this.bytes = new byte[initialCapacity];
+        this.isFinite = false;
+    }
+
+    public static ByteBitBuffer allocate(int lengthInBits) {
+        return new ByteBitBuffer(new byte[(lengthInBits + 7) / 8]);
+    }
+
+    public static ByteBitBuffer createInfinite() {
+        return new ByteBitBuffer(64);
+    }
+
+    @Override public BitBuffer flip() {
+        limit = position;
+        position = 0;
+        return this;
+    }
+
+    @Override public String toBooleanStringFromPosition(int startIndex) {
+        return toBooleanString(startIndex, position-startIndex);
+    }
+
+    @Override public byte[] array() {
+        return bytes;
+    }
+
+	@Override
+	public void putInteger(int position, int length,int number) {
+		String s = Integer.toBinaryString(number);
+		if (s.length() > length) {
+			//value is to large
+			return;
+		}
+		
+		for (int i = 0;i < length;i++){
+			int index = position + i;
+     	    this.put(index,false);
+		}
+		
+		
+		int startIndex = position + length - s.length();
+		for (int i = 0;i < s.length();i++){
+			/*
+			 * i = max --> index = position + length - 1
+			 * i = 0 --> index = position + 
+			 */
+			int index = startIndex + i;
+			if (s.charAt(i) == '1') {
+			  this.put(index, true );
+			} else {
+			  this.put(index, false);		
+			}
+		}
+		
+	}
+	
+	@Override
+	public void putChar5String(int position, int length, String s) {
+
+		String upperCaseString  = s.toUpperCase();
+		int offset = 0;
+		for (int i = 0; i < s.length() ; i++) {
+			char character = upperCaseString.charAt(i);
+			int intValue = (int) character - 32;
+			if (intValue > -1 && intValue < 64) {
+				this.putInteger(position + offset,5, intValue); 
+				offset = offset + 5;
+			} else {
+				this.putInteger(position + offset,5,0); 
+				position = position + 5;
+			}
+		}
+	}
+
+	@Override
+	public void putChar6String(int position, int length, String s) {
+
+		String upperCaseString  = s.toUpperCase();
+		int offset = 0;
+		for (int i = 0; i < s.length() ; i++) {
+			char character = upperCaseString.charAt(i);
+			int intValue = (int) character - 32;
+			if (intValue > -1 && intValue < 64) {
+				this.putInteger(position + offset,6, intValue); 
+				offset = offset + 6;
+			} else {
+				this.putInteger(position + offset,6,0); 
+				position = position + 6;
+			}
+		}
+	}
+
+	@Override
+	public int getInteger(int position, int length) {
+		StringBuffer sb = new StringBuffer();
+		for (int i = 0;i < length;i++){
+			if (this.get(position + i)) {
+				sb.append("1");
+			} else {
+				sb.append("0");
+			}
+		}
+	    return Integer.parseInt(sb.toString(), 2);
+	}
+
+	@Override
+	public String getChar6String(int position, int length) {
+		
+		StringBuilder stringBuilder = new StringBuilder();
+
+		int chars = length / 6;
+
+		for (int i = 0; i < chars; i++) {
+			int newPosition =  position + i * 6;
+
+			int x =  this.getInteger(newPosition, 6);
+			x = x + 32;
+		
+			char c = (char) x;
+			stringBuilder.append(c);
+
+		}
+
+		return stringBuilder.toString().trim();
+	}
+	
+	@Override
+	public String getChar5String(int position, int length) {
+		
+		StringBuilder stringBuilder = new StringBuilder();
+
+		int chars = length / 5;
+
+		for (int i = 0; i < chars; i++) {
+			int newPosition =  position + i * 5;
+
+			int x =  getInteger(newPosition, 5);
+			x = x + 42;
+			
+			char c = (char) x;
+			stringBuilder.append(c);
+
+		}
+
+		return stringBuilder.toString().trim();
+	}
+
+}