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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 com.itextpdf.io.codec.brotli.dec;
import static com.itextpdf.io.codec.brotli.dec.WordTransformType.IDENTITY;
import static com.itextpdf.io.codec.brotli.dec.WordTransformType.OMIT_FIRST_1;
import static com.itextpdf.io.codec.brotli.dec.WordTransformType.OMIT_FIRST_2;
import static com.itextpdf.io.codec.brotli.dec.WordTransformType.OMIT_FIRST_3;
import static com.itextpdf.io.codec.brotli.dec.WordTransformType.OMIT_FIRST_4;
import static com.itextpdf.io.codec.brotli.dec.WordTransformType.OMIT_FIRST_5;
import static com.itextpdf.io.codec.brotli.dec.WordTransformType.OMIT_FIRST_6;
import static com.itextpdf.io.codec.brotli.dec.WordTransformType.OMIT_FIRST_7;
import static com.itextpdf.io.codec.brotli.dec.WordTransformType.OMIT_FIRST_9;
import static com.itextpdf.io.codec.brotli.dec.WordTransformType.OMIT_LAST_1;
import static com.itextpdf.io.codec.brotli.dec.WordTransformType.OMIT_LAST_2;
import static com.itextpdf.io.codec.brotli.dec.WordTransformType.OMIT_LAST_3;
import static com.itextpdf.io.codec.brotli.dec.WordTransformType.OMIT_LAST_4;
import static com.itextpdf.io.codec.brotli.dec.WordTransformType.OMIT_LAST_5;
import static com.itextpdf.io.codec.brotli.dec.WordTransformType.OMIT_LAST_6;
import static com.itextpdf.io.codec.brotli.dec.WordTransformType.OMIT_LAST_7;
import static com.itextpdf.io.codec.brotli.dec.WordTransformType.OMIT_LAST_8;
import static com.itextpdf.io.codec.brotli.dec.WordTransformType.OMIT_LAST_9;
import static com.itextpdf.io.codec.brotli.dec.WordTransformType.UPPERCASE_ALL;
import static com.itextpdf.io.codec.brotli.dec.WordTransformType.UPPERCASE_FIRST;
import java.nio.ByteBuffer;
/**
* Transformations on dictionary words.
*/
final class Transform {
private final byte[] prefix;
private final int type;
private final byte[] suffix;
Transform(String prefix, int type, String suffix) {
this.prefix = readUniBytes(prefix);
this.type = type;
this.suffix = readUniBytes(suffix);
}
static byte[] readUniBytes(String uniBytes) {
byte[] result = new byte[uniBytes.length()];
for (int i = 0; i < result.length; ++i) {
result[i] = (byte) uniBytes.charAt(i);
}
return result;
}
static final Transform[] TRANSFORMS = {
new Transform("", IDENTITY, ""),
new Transform("", IDENTITY, " "),
new Transform(" ", IDENTITY, " "),
new Transform("", OMIT_FIRST_1, ""),
new Transform("", UPPERCASE_FIRST, " "),
new Transform("", IDENTITY, " the "),
new Transform(" ", IDENTITY, ""),
new Transform("s ", IDENTITY, " "),
new Transform("", IDENTITY, " of "),
new Transform("", UPPERCASE_FIRST, ""),
new Transform("", IDENTITY, " and "),
new Transform("", OMIT_FIRST_2, ""),
new Transform("", OMIT_LAST_1, ""),
new Transform(", ", IDENTITY, " "),
new Transform("", IDENTITY, ", "),
new Transform(" ", UPPERCASE_FIRST, " "),
new Transform("", IDENTITY, " in "),
new Transform("", IDENTITY, " to "),
new Transform("e ", IDENTITY, " "),
new Transform("", IDENTITY, "\""),
new Transform("", IDENTITY, "."),
new Transform("", IDENTITY, "\">"),
new Transform("", IDENTITY, "\n"),
new Transform("", OMIT_LAST_3, ""),
new Transform("", IDENTITY, "]"),
new Transform("", IDENTITY, " for "),
new Transform("", OMIT_FIRST_3, ""),
new Transform("", OMIT_LAST_2, ""),
new Transform("", IDENTITY, " a "),
new Transform("", IDENTITY, " that "),
new Transform(" ", UPPERCASE_FIRST, ""),
new Transform("", IDENTITY, ". "),
new Transform(".", IDENTITY, ""),
new Transform(" ", IDENTITY, ", "),
new Transform("", OMIT_FIRST_4, ""),
new Transform("", IDENTITY, " with "),
new Transform("", IDENTITY, "'"),
new Transform("", IDENTITY, " from "),
new Transform("", IDENTITY, " by "),
new Transform("", OMIT_FIRST_5, ""),
new Transform("", OMIT_FIRST_6, ""),
new Transform(" the ", IDENTITY, ""),
new Transform("", OMIT_LAST_4, ""),
new Transform("", IDENTITY, ". The "),
new Transform("", UPPERCASE_ALL, ""),
new Transform("", IDENTITY, " on "),
new Transform("", IDENTITY, " as "),
new Transform("", IDENTITY, " is "),
new Transform("", OMIT_LAST_7, ""),
new Transform("", OMIT_LAST_1, "ing "),
new Transform("", IDENTITY, "\n\t"),
new Transform("", IDENTITY, ":"),
new Transform(" ", IDENTITY, ". "),
new Transform("", IDENTITY, "ed "),
new Transform("", OMIT_FIRST_9, ""),
new Transform("", OMIT_FIRST_7, ""),
new Transform("", OMIT_LAST_6, ""),
new Transform("", IDENTITY, "("),
new Transform("", UPPERCASE_FIRST, ", "),
new Transform("", OMIT_LAST_8, ""),
new Transform("", IDENTITY, " at "),
new Transform("", IDENTITY, "ly "),
new Transform(" the ", IDENTITY, " of "),
new Transform("", OMIT_LAST_5, ""),
new Transform("", OMIT_LAST_9, ""),
new Transform(" ", UPPERCASE_FIRST, ", "),
new Transform("", UPPERCASE_FIRST, "\""),
new Transform(".", IDENTITY, "("),
new Transform("", UPPERCASE_ALL, " "),
new Transform("", UPPERCASE_FIRST, "\">"),
new Transform("", IDENTITY, "=\""),
new Transform(" ", IDENTITY, "."),
new Transform(".com/", IDENTITY, ""),
new Transform(" the ", IDENTITY, " of the "),
new Transform("", UPPERCASE_FIRST, "'"),
new Transform("", IDENTITY, ". This "),
new Transform("", IDENTITY, ","),
new Transform(".", IDENTITY, " "),
new Transform("", UPPERCASE_FIRST, "("),
new Transform("", UPPERCASE_FIRST, "."),
new Transform("", IDENTITY, " not "),
new Transform(" ", IDENTITY, "=\""),
new Transform("", IDENTITY, "er "),
new Transform(" ", UPPERCASE_ALL, " "),
new Transform("", IDENTITY, "al "),
new Transform(" ", UPPERCASE_ALL, ""),
new Transform("", IDENTITY, "='"),
new Transform("", UPPERCASE_ALL, "\""),
new Transform("", UPPERCASE_FIRST, ". "),
new Transform(" ", IDENTITY, "("),
new Transform("", IDENTITY, "ful "),
new Transform(" ", UPPERCASE_FIRST, ". "),
new Transform("", IDENTITY, "ive "),
new Transform("", IDENTITY, "less "),
new Transform("", UPPERCASE_ALL, "'"),
new Transform("", IDENTITY, "est "),
new Transform(" ", UPPERCASE_FIRST, "."),
new Transform("", UPPERCASE_ALL, "\">"),
new Transform(" ", IDENTITY, "='"),
new Transform("", UPPERCASE_FIRST, ","),
new Transform("", IDENTITY, "ize "),
new Transform("", UPPERCASE_ALL, "."),
new Transform("\u00c2\u00a0", IDENTITY, ""),
new Transform(" ", IDENTITY, ","),
new Transform("", UPPERCASE_FIRST, "=\""),
new Transform("", UPPERCASE_ALL, "=\""),
new Transform("", IDENTITY, "ous "),
new Transform("", UPPERCASE_ALL, ", "),
new Transform("", UPPERCASE_FIRST, "='"),
new Transform(" ", UPPERCASE_FIRST, ","),
new Transform(" ", UPPERCASE_ALL, "=\""),
new Transform(" ", UPPERCASE_ALL, ", "),
new Transform("", UPPERCASE_ALL, ","),
new Transform("", UPPERCASE_ALL, "("),
new Transform("", UPPERCASE_ALL, ". "),
new Transform(" ", UPPERCASE_ALL, "."),
new Transform("", UPPERCASE_ALL, "='"),
new Transform(" ", UPPERCASE_ALL, ". "),
new Transform(" ", UPPERCASE_FIRST, "=\""),
new Transform(" ", UPPERCASE_ALL, "='"),
new Transform(" ", UPPERCASE_FIRST, "='")
};
static int transformDictionaryWord(byte[] dst, int dstOffset, ByteBuffer data, int wordOffset,
int len, Transform transform) {
int offset = dstOffset;
// Copy prefix.
byte[] string = transform.prefix;
int tmp = string.length;
int i = 0;
// In most cases tmp < 10 -> no benefits from System.arrayCopy
while (i < tmp) {
dst[offset++] = string[i++];
}
// Copy trimmed word.
int op = transform.type;
tmp = WordTransformType.getOmitFirst(op);
if (tmp > len) {
tmp = len;
}
wordOffset += tmp;
len -= tmp;
len -= WordTransformType.getOmitLast(op);
i = len;
while (i > 0) {
dst[offset++] = data.get(wordOffset++);
i--;
}
if (op == UPPERCASE_ALL || op == UPPERCASE_FIRST) {
int uppercaseOffset = offset - len;
if (op == UPPERCASE_FIRST) {
len = 1;
}
while (len > 0) {
tmp = dst[uppercaseOffset] & 0xFF;
if (tmp < 0xc0) {
if (tmp >= 'a' && tmp <= 'z') {
dst[uppercaseOffset] ^= (byte) 32;
}
uppercaseOffset += 1;
len -= 1;
} else if (tmp < 0xe0) {
dst[uppercaseOffset + 1] ^= (byte) 32;
uppercaseOffset += 2;
len -= 2;
} else {
dst[uppercaseOffset + 2] ^= (byte) 5;
uppercaseOffset += 3;
len -= 3;
}
}
}
// Copy suffix.
string = transform.suffix;
tmp = string.length;
i = 0;
while (i < tmp) {
dst[offset++] = string[i++];
}
return offset - dstOffset;
}
}
