Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance.
Project price only 1 $
You can buy this project and download/modify it how often you want.
io.github.mmm.binary.codec.BitConfig Maven / Gradle / Ivy
/* Copyright (c) The m-m-m Team, Licensed under the Apache License, Version 2.0
* http://www.apache.org/licenses/LICENSE-2.0 */
package io.github.mmm.binary.codec;
/**
* Configuration of bit parameters for power-of-two codecs.
*
* @since 1.0.0
*/
class BitConfig {
private static final BitConfig[] CONFIGS = new BitConfig[] {
// Base2 : 1bit -> 8 chars (binary)
new BitConfig(1, 1, 8),
// Base4 : 2bit -> 4 chars
new BitConfig(2, 1, 4),
// Base8 : 3bit -> 8 chars with max padding 2 (octal)
new BitConfig(3, 3, 8, new int[] { 0, 0, 1, 0, 0, 2 }, new int[] { 1, 2 }, new int[] { 3, 6 }),
// Base16: 4bit -> 2 chars (hex)
new BitConfig(4, 1, 2),
// Base32: 5bit -> 2 chars with max padding 4
new BitConfig(5, 5, 8, new int[] { 0, 1, 0, 2, 3, 0, 4 }, new int[] { 2, 4, 1, 3 }, new int[] { 2, 4, 5, 7 }),
// Base64: 6bit -> 2 chars with max padding 2
new BitConfig(6, 3, 4, new int[] { 0, 1, 2, 3 }, new int[] { 4, 2 }, new int[] { 2, 3 }) //
};
final int length;
final int bitCount;
final int mask;
final int bytesPerChunk;
final int charsPerChunk;
private final int[] chars2decode;
private final int[] shift4encode;
private final int[] chunkChars4encode;
public BitConfig(int bitCount, int bytesPerChunk, int charsPerChunk) {
this(bitCount, bytesPerChunk, charsPerChunk, null, null, null);
}
public BitConfig(int bitCount, int bytesPerChunk, int charsPerChunk, int[] chars2decode, int[] shift4encode,
int[] chunkChars4encode) {
super();
this.bitCount = bitCount;
this.length = 1 << bitCount;
this.mask = this.length - 1;
this.bytesPerChunk = bytesPerChunk;
this.charsPerChunk = charsPerChunk;
this.chars2decode = chars2decode;
this.shift4encode = shift4encode;
this.chunkChars4encode = chunkChars4encode;
}
int getBytes2Decode(int charsInChunk) {
int bytes = 0;
if ((this.chars2decode != null) && (charsInChunk <= this.chars2decode.length)) {
bytes = this.chars2decode[charsInChunk - 1];
}
assert (bytes != 0);
return bytes;
}
int getShift4Encode(int paddingModulo) {
int bytes = 0;
if ((this.shift4encode != null) && (paddingModulo <= this.shift4encode.length)) {
bytes = this.shift4encode[paddingModulo - 1];
}
assert (bytes != 0);
return bytes;
}
int getChunkChars4Encode(int paddingModulo) {
int chunkChars = 0;
if ((this.chunkChars4encode != null) && (paddingModulo <= this.chunkChars4encode.length)) {
chunkChars = this.chunkChars4encode[paddingModulo - 1];
}
assert (chunkChars != 0);
return chunkChars;
}
public static BitConfig of(int length) {
switch (length) {
case 2:
return CONFIGS[0];
case 4:
return CONFIGS[1];
case 8:
return CONFIGS[2];
case 16:
return CONFIGS[3];
case 32:
return CONFIGS[4];
case 64:
return CONFIGS[5];
}
return null;
}
}
