public static void compress()
{
string text = BinaryStdIn.readString();
TST tST = new TST();
int i;
for (i = 0; i < 256; i++)
{
tST.put(new StringBuilder().append("").append((char)i).toString(), Integer.valueOf(i));
}
i = 257;
while (java.lang.String.instancehelper_length(text) > 0)
{
string text2 = tST.longestPrefixOf(text);
BinaryStdOut.write(((Integer)tST.get(text2)).intValue(), 12);
int num = java.lang.String.instancehelper_length(text2);
if (num < java.lang.String.instancehelper_length(text) && i < 4096)
{
TST arg_A5_0 = tST;
string arg_A5_1 = java.lang.String.instancehelper_substring(text, 0, num + 1);
int arg_A0_0 = i;
i++;
arg_A5_0.put(arg_A5_1, Integer.valueOf(arg_A0_0));
}
text = java.lang.String.instancehelper_substring(text, num);
}
BinaryStdOut.write(256, 12);
BinaryStdOut.close();
}
/**
* Reads a sequence of 8-bit extended ASCII characters over the alphabet
* { A, C, T, G } from standard input; compresses them using two bits per
* character; and writes the results to standard output.
*/
public static void compress() {
Alphabet DNA = Alphabet.DNA;
String s = BinaryStdIn.readString();
int n = s.length();
BinaryStdOut.write(n);
// Write two-bit code for char.
for (int i = 0; i < n; i++) {
int d = DNA.toIndex(s.charAt(i));
BinaryStdOut.write(d, 2);
}
BinaryStdOut.close();
}
/**
* Reads a sequence of 8-bit bytes from standard input; compresses
* them using LZW compression with 12-bit codewords; and writes the results
* to standard output.
*/
public static void compress() {
String input = BinaryStdIn.readString();
TST<Integer> st = new TST<Integer>();
for (int i = 0; i < R; i++)
st.put("" + (char) i, i);
int code = R+1; // R is codeword for EOF
while (input.length() > 0) {
String s = st.longestPrefixOf(input); // Find max prefix match s.
BinaryStdOut.write(st.get(s), W); // Print s's encoding.
int t = s.length();
if (t < input.length() && code < L) // Add s to symbol table.
st.put(input.substring(0, t + 1), code++);
input = input.substring(t); // Scan past s in input.
}
BinaryStdOut.write(R, W);
BinaryStdOut.close();
}
/**
* Reads a sequence of 8-bit bytes from standard input; compresses them
* using Huffman codes with an 8-bit alphabet; and writes the results
* to standard output.
*/
public static void compress() {
// read the input
String s = BinaryStdIn.readString();
char[] input = s.toCharArray();
// tabulate frequency counts
int[] freq = new int[R];
for (int i = 0; i < input.length; i++)
freq[input[i]]++;
// build Huffman trie
Node root = buildTrie(freq);
// build code table
String[] st = new String[R];
buildCode(st, root, "");
// print trie for decoder
writeTrie(root);
// print number of bytes in original uncompressed message
BinaryStdOut.write(input.length);
// use Huffman code to encode input
for (int i = 0; i < input.length; i++) {
String code = st[input[i]];
for (int j = 0; j < code.length(); j++) {
if (code.charAt(j) == '0') {
BinaryStdOut.write(false);
}
else if (code.charAt(j) == '1') {
BinaryStdOut.write(true);
}
else throw new IllegalStateException("Illegal state");
}
}
// close output stream
BinaryStdOut.close();
}