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/* Copyright 2015 Google Inc. All Rights Reserved.
Distributed under MIT license.
See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
*/
package org.brotli.dec;
/**
* Common context lookup table for all context modes.
*/
final class Context {
static final int[] LOOKUP = new int[2048];
private static final String UTF_MAP = " !! ! \"#$##%#$&'##(#)#+++++++++"
+ "+((&*'##,---,---,-----,-----,-----&#'###.///.///./////./////./////&#'# ";
private static final String UTF_RLE = "A/* ': & : $ \u0081 @";
private static void unpackLookupTable(int[] lookup, String map, String rle) {
// LSB6, MSB6, SIGNED
for (int i = 0; i < 256; ++i) {
lookup[i] = i & 0x3F;
lookup[512 + i] = i >> 2;
lookup[1792 + i] = 2 + (i >> 6);
}
// UTF8
for (int i = 0; i < 128; ++i) {
lookup[1024 + i] = 4 * (map.charAt(i) - 32);
}
for (int i = 0; i < 64; ++i) {
lookup[1152 + i] = i & 1;
lookup[1216 + i] = 2 + (i & 1);
}
int offset = 1280;
for (int k = 0; k < 19; ++k) {
int value = k & 3;
int rep = rle.charAt(k) - 32;
for (int i = 0; i < rep; ++i) {
lookup[offset++] = value;
}
}
// SIGNED
for (int i = 0; i < 16; ++i) {
lookup[1792 + i] = 1;
lookup[2032 + i] = 6;
}
lookup[1792] = 0;
lookup[2047] = 7;
for (int i = 0; i < 256; ++i) {
lookup[1536 + i] = lookup[1792 + i] << 3;
}
}
static {
unpackLookupTable(LOOKUP, UTF_MAP, UTF_RLE);
}
}
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