org.glassfish.grizzly.http2.hpack.StringWriter Maven / Gradle / Ivy
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package org.glassfish.grizzly.http2.hpack;
import org.glassfish.grizzly.Buffer;
import java.util.Arrays;
//
// 0 1 2 3 4 5 6 7
// +---+---+---+---+---+---+---+---+
// | H | String Length (7+) |
// +---+---------------------------+
// | String Data (Length octets) |
// +-------------------------------+
//
// StringWriter does not require a notion of endOfInput (isLast) in 'write'
// methods due to the nature of string representation in HPACK. Namely, the
// length of the string is put before string's contents. Therefore the length is
// always known beforehand.
//
// Expected use:
//
// configure write* (reset configure write*)*
//
final class StringWriter {
private static final byte NEW = 0x0;
private static final byte CONFIGURED = 0x1;
private static final byte LENGTH_WRITTEN = 0x2;
private static final byte DONE = 0x4;
private final IntegerWriter intWriter = new IntegerWriter();
private final Huffman.Writer huffmanWriter = new Huffman.Writer();
private final ISO_8859_1.Writer plainWriter = new ISO_8859_1.Writer();
private byte state = NEW;
private boolean huffman;
StringWriter configure(CharSequence input, boolean huffman) {
return configure(input, 0, input.length(), huffman);
}
StringWriter configure(CharSequence input, int start, int end,
boolean huffman) {
if (start < 0 || end < 0 || end > input.length() || start > end) {
throw new IndexOutOfBoundsException(
String.format("input.length()=%s, start=%s, end=%s",
input.length(), start, end));
}
if (!huffman) {
plainWriter.configure(input, start, end);
intWriter.configure(end - start, 7, 0b0000_0000);
} else {
huffmanWriter.from(input, start, end);
intWriter.configure(Huffman.INSTANCE.lengthOf(input, start, end),
7, 0b1000_0000);
}
this.huffman = huffman;
state = CONFIGURED;
return this;
}
boolean write(Buffer output) {
if (state == DONE) {
return true;
}
if (state == NEW) {
throw new IllegalStateException("Configure first");
}
if (!output.hasRemaining()) {
return false;
}
if (state == CONFIGURED) {
if (intWriter.write(output)) {
state = LENGTH_WRITTEN;
} else {
return false;
}
}
if (state == LENGTH_WRITTEN) {
boolean written = huffman
? huffmanWriter.write(output)
: plainWriter.write(output);
if (written) {
state = DONE;
return true;
} else {
return false;
}
}
throw new InternalError(Arrays.toString(new Object[]{state, huffman}));
}
void reset() {
intWriter.reset();
if (huffman) {
huffmanWriter.reset();
} else {
plainWriter.reset();
}
state = NEW;
}
}
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