[old-projects.git] / ekit / com / hexidec / util / Base64Codec.java

package com.hexidec.util;\r
\r
import java.util.Vector;\r
\r
public class Base64Codec\r
{\r
	public static Vector Base64Tokens = new Vector(64);\r
	static\r
	{\r
		Base64Tokens.add("A");\r
		Base64Tokens.add("B");\r
		Base64Tokens.add("C");\r
		Base64Tokens.add("D");\r
		Base64Tokens.add("E");\r
		Base64Tokens.add("F");\r
		Base64Tokens.add("G");\r
		Base64Tokens.add("H");\r
		Base64Tokens.add("I");\r
		Base64Tokens.add("J");\r
		Base64Tokens.add("K");\r
		Base64Tokens.add("L");\r
		Base64Tokens.add("M");\r
		Base64Tokens.add("N");\r
		Base64Tokens.add("O");\r
		Base64Tokens.add("P");\r
		Base64Tokens.add("Q");\r
		Base64Tokens.add("R");\r
		Base64Tokens.add("S");\r
		Base64Tokens.add("T");\r
		Base64Tokens.add("U");\r
		Base64Tokens.add("V");\r
		Base64Tokens.add("W");\r
		Base64Tokens.add("X");\r
		Base64Tokens.add("Y");\r
		Base64Tokens.add("Z");\r
		Base64Tokens.add("a");\r
		Base64Tokens.add("b");\r
		Base64Tokens.add("c");\r
		Base64Tokens.add("d");\r
		Base64Tokens.add("e");\r
		Base64Tokens.add("f");\r
		Base64Tokens.add("g");\r
		Base64Tokens.add("h");\r
		Base64Tokens.add("i");\r
		Base64Tokens.add("j");\r
		Base64Tokens.add("k");\r
		Base64Tokens.add("l");\r
		Base64Tokens.add("m");\r
		Base64Tokens.add("n");\r
		Base64Tokens.add("o");\r
		Base64Tokens.add("p");\r
		Base64Tokens.add("q");\r
		Base64Tokens.add("r");\r
		Base64Tokens.add("s");\r
		Base64Tokens.add("t");\r
		Base64Tokens.add("u");\r
		Base64Tokens.add("v");\r
		Base64Tokens.add("w");\r
		Base64Tokens.add("x");\r
		Base64Tokens.add("y");\r
		Base64Tokens.add("z");\r
		Base64Tokens.add("0");\r
		Base64Tokens.add("1");\r
		Base64Tokens.add("2");\r
		Base64Tokens.add("3");\r
		Base64Tokens.add("4");\r
		Base64Tokens.add("5");\r
		Base64Tokens.add("6");\r
		Base64Tokens.add("7");\r
		Base64Tokens.add("8");\r
		Base64Tokens.add("9");\r
		Base64Tokens.add("+");\r
		Base64Tokens.add("/");\r
	}	\r
	public static final char Base64Pad = '=';\r
	public static final char Linefeed = (char)10;\r
	public static final char Carriage = (char)13;\r
	public static final int  LineMax = 75;\r
\r
	public Base64Codec()\r
	{\r
	}\r
\r
	public static String encode(String source)\r
	{\r
		byte[] sourceBytes = source.getBytes();\r
		int byteTriad = sourceBytes.length % 3;\r
		StringBuffer encoding = new StringBuffer();\r
		int bitOffset = 7;\r
		int b64Offset = 5;\r
		int bytePlace = 0;\r
		byte tokenValue = (byte)0;\r
		int lineLength = 0;\r
		while(bytePlace < sourceBytes.length)\r
		{\r
			tokenValue = (byte)((byte)tokenValue | (byte)((sourceBytes[bytePlace] & (1 << bitOffset)) > 0 ? (1 << b64Offset) : (byte)0));\r
			bitOffset--;\r
			if(bitOffset < 0)\r
			{\r
				bitOffset = 7;\r
				bytePlace++;\r
			}\r
			b64Offset--;\r
			if(b64Offset < 0)\r
			{\r
				b64Offset = 5;\r
				encoding.append((String)(Base64Tokens.elementAt(tokenValue)));\r
				tokenValue = (byte)0;\r
				lineLength++;\r
				if(lineLength > LineMax)\r
				{\r
					encoding.append(Carriage);\r
					encoding.append(Linefeed);\r
					lineLength = 0;\r
				}\r
			}\r
		}\r
		if(b64Offset != 5)\r
		{\r
			bytePlace--;\r
			for(int i = b64Offset; i >= 0; i--)\r
			{\r
				if(bitOffset >= 0)\r
				{\r
					tokenValue = (byte)((byte)tokenValue | (byte)((sourceBytes[bytePlace] & (1 << bitOffset)) > 0 ? (1 << i) : (byte)0));\r
				}\r
				bitOffset--;\r
			}\r
			encoding.append((String)(Base64Tokens.elementAt(tokenValue)));\r
		}	\r
		if(byteTriad == 2)\r
		{\r
			encoding.append(Base64Pad);\r
		}\r
		else if(byteTriad == 1)\r
		{\r
			encoding.append(Base64Pad);\r
			encoding.append(Base64Pad);\r
		}\r
		return encoding.toString();\r
	}\r
\r
	public static String decode(String source)\r
	{\r
		StringBuffer decoding = new StringBuffer();\r
		int bitOffset = 7;\r
		int b64Offset = 5;\r
		int bytePlace = 0;\r
		byte charValue = (byte)0;\r
		while(bytePlace < source.length())\r
		{\r
			if(source.charAt(bytePlace) == Base64Pad)\r
			{\r
				// end processing when encountering special end-padding character\r
				break;\r
			}\r
			if(source.charAt(bytePlace) == Linefeed || source.charAt(bytePlace) == Carriage)\r
			{\r
				// ignore standard line break characters\r
				bytePlace++;\r
				continue;\r
			}\r
			else\r
			{\r
				if(!Base64Tokens.contains(source.substring(bytePlace, bytePlace + 1)))\r
				{\r
					// ignore unknown characters (mostly implemented to deal with other line break character sequences)\r
					bytePlace++;\r
					continue;\r
				}\r
				else\r
				{\r
					byte currentByte = (byte)(Base64Tokens.indexOf(source.substring(bytePlace, bytePlace + 1)));\r
					charValue = (byte)((byte)charValue | (byte)((currentByte & (1 << b64Offset)) > 0 ? (1 << bitOffset) : (byte)0));\r
					bitOffset--;\r
					if(bitOffset < 0)\r
					{\r
						bitOffset = 7;\r
						decoding.append((char)charValue);\r
						charValue = (byte)0;\r
					}\r
					b64Offset--;\r
					if(b64Offset < 0)\r
					{\r
						b64Offset = 5;\r
						bytePlace++;\r
					}\r
				}\r
			}\r
		}\r
		return decoding.toString();\r
	}\r
}
Commit	Line	Data
c2da4d40 JL	1	package com.hexidec.util;\r
	2	\r
	3	import java.util.Vector;\r
	4	\r
	5	public class Base64Codec\r
	6	{\r
	7	public static Vector Base64Tokens = new Vector(64);\r
	8	static\r
	9	{\r
	10	Base64Tokens.add("A");\r
	11	Base64Tokens.add("B");\r
	12	Base64Tokens.add("C");\r
	13	Base64Tokens.add("D");\r
	14	Base64Tokens.add("E");\r
	15	Base64Tokens.add("F");\r
	16	Base64Tokens.add("G");\r
	17	Base64Tokens.add("H");\r
	18	Base64Tokens.add("I");\r
	19	Base64Tokens.add("J");\r
	20	Base64Tokens.add("K");\r
	21	Base64Tokens.add("L");\r
	22	Base64Tokens.add("M");\r
	23	Base64Tokens.add("N");\r
	24	Base64Tokens.add("O");\r
	25	Base64Tokens.add("P");\r
	26	Base64Tokens.add("Q");\r
	27	Base64Tokens.add("R");\r
	28	Base64Tokens.add("S");\r
	29	Base64Tokens.add("T");\r
	30	Base64Tokens.add("U");\r
	31	Base64Tokens.add("V");\r
	32	Base64Tokens.add("W");\r
	33	Base64Tokens.add("X");\r
	34	Base64Tokens.add("Y");\r
	35	Base64Tokens.add("Z");\r
	36	Base64Tokens.add("a");\r
	37	Base64Tokens.add("b");\r
	38	Base64Tokens.add("c");\r
	39	Base64Tokens.add("d");\r
	40	Base64Tokens.add("e");\r
	41	Base64Tokens.add("f");\r
	42	Base64Tokens.add("g");\r
	43	Base64Tokens.add("h");\r
	44	Base64Tokens.add("i");\r
	45	Base64Tokens.add("j");\r
	46	Base64Tokens.add("k");\r
	47	Base64Tokens.add("l");\r
	48	Base64Tokens.add("m");\r
	49	Base64Tokens.add("n");\r
	50	Base64Tokens.add("o");\r
	51	Base64Tokens.add("p");\r
	52	Base64Tokens.add("q");\r
	53	Base64Tokens.add("r");\r
	54	Base64Tokens.add("s");\r
	55	Base64Tokens.add("t");\r
	56	Base64Tokens.add("u");\r
	57	Base64Tokens.add("v");\r
	58	Base64Tokens.add("w");\r
	59	Base64Tokens.add("x");\r
	60	Base64Tokens.add("y");\r
	61	Base64Tokens.add("z");\r
	62	Base64Tokens.add("0");\r
	63	Base64Tokens.add("1");\r
	64	Base64Tokens.add("2");\r
65	Base64Tokens.add("3");\r
66	Base64Tokens.add("4");\r
67	Base64Tokens.add("5");\r
68	Base64Tokens.add("6");\r
69	Base64Tokens.add("7");\r
70	Base64Tokens.add("8");\r
71	Base64Tokens.add("9");\r
72	Base64Tokens.add("+");\r
73	Base64Tokens.add("/");\r
74	} \r
75	public static final char Base64Pad = '=';\r
76	public static final char Linefeed = (char)10;\r
77	public static final char Carriage = (char)13;\r
78	public static final int LineMax = 75;\r
79	\r
80	public Base64Codec()\r
81	{\r
82	}\r
83	\r
84	public static String encode(String source)\r
85	{\r
86	byte[] sourceBytes = source.getBytes();\r
87	int byteTriad = sourceBytes.length % 3;\r
88	StringBuffer encoding = new StringBuffer();\r
89	int bitOffset = 7;\r
90	int b64Offset = 5;\r
91	int bytePlace = 0;\r
92	byte tokenValue = (byte)0;\r
93	int lineLength = 0;\r
94	while(bytePlace < sourceBytes.length)\r
95	{\r
96	tokenValue = (byte)((byte)tokenValue \| (byte)((sourceBytes[bytePlace] & (1 << bitOffset)) > 0 ? (1 << b64Offset) : (byte)0));\r
97	bitOffset--;\r
98	if(bitOffset < 0)\r
99	{\r
100	bitOffset = 7;\r
101	bytePlace++;\r
102	}\r
103	b64Offset--;\r
104	if(b64Offset < 0)\r
105	{\r
106	b64Offset = 5;\r
107	encoding.append((String)(Base64Tokens.elementAt(tokenValue)));\r
108	tokenValue = (byte)0;\r
109	lineLength++;\r
110	if(lineLength > LineMax)\r
111	{\r
112	encoding.append(Carriage);\r
113	encoding.append(Linefeed);\r
114	lineLength = 0;\r
115	}\r
116	}\r
117	}\r
118	if(b64Offset != 5)\r
119	{\r
120	bytePlace--;\r
121	for(int i = b64Offset; i >= 0; i--)\r
122	{\r
123	if(bitOffset >= 0)\r
124	{\r
125	tokenValue = (byte)((byte)tokenValue \| (byte)((sourceBytes[bytePlace] & (1 << bitOffset)) > 0 ? (1 << i) : (byte)0));\r
126	}\r
127	bitOffset--;\r
128	}\r
129	encoding.append((String)(Base64Tokens.elementAt(tokenValue)));\r
130	} \r
131	if(byteTriad == 2)\r
132	{\r
133	encoding.append(Base64Pad);\r
134	}\r
135	else if(byteTriad == 1)\r
136	{\r
137	encoding.append(Base64Pad);\r
138	encoding.append(Base64Pad);\r
139	}\r
140	return encoding.toString();\r
141	}\r
142	\r
143	public static String decode(String source)\r
144	{\r
145	StringBuffer decoding = new StringBuffer();\r
146	int bitOffset = 7;\r
147	int b64Offset = 5;\r
148	int bytePlace = 0;\r
149	byte charValue = (byte)0;\r
150	while(bytePlace < source.length())\r
151	{\r
152	if(source.charAt(bytePlace) == Base64Pad)\r
153	{\r
154	// end processing when encountering special end-padding character\r
155	break;\r
156	}\r
157	if(source.charAt(bytePlace) == Linefeed \|\| source.charAt(bytePlace) == Carriage)\r
158	{\r
159	// ignore standard line break characters\r
160	bytePlace++;\r
161	continue;\r
162	}\r
163	else\r
164	{\r
165	if(!Base64Tokens.contains(source.substring(bytePlace, bytePlace + 1)))\r
166	{\r
167	// ignore unknown characters (mostly implemented to deal with other line break character sequences)\r
168	bytePlace++;\r
169	continue;\r
170	}\r
171	else\r
172	{\r
173	byte currentByte = (byte)(Base64Tokens.indexOf(source.substring(bytePlace, bytePlace + 1)));\r
174	charValue = (byte)((byte)charValue \| (byte)((currentByte & (1 << b64Offset)) > 0 ? (1 << bitOffset) : (byte)0));\r
175	bitOffset--;\r
176	if(bitOffset < 0)\r
177	{\r
178	bitOffset = 7;\r
179	decoding.append((char)charValue);\r
180	charValue = (byte)0;\r
181	}\r
182	b64Offset--;\r
183	if(b64Offset < 0)\r
184	{\r
185	b64Offset = 5;\r
186	bytePlace++;\r
187	}\r
188	}\r
189	}\r
190	}\r
191	return decoding.toString();\r
192	}\r
193	}