?? bitreserve.java
字號(hào):
/**
*-----------------------------------------------------------------------
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License as published
* by the Free Software Foundation; either version 2 of the License,or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not,write to the Free Software
* Foundation,Inc.,675 Mass Ave,Cambridge,MA 02139,USA.
*----------------------------------------------------------------------
*/
package javazoom.jlme.decoder;
final class BitReserve {
private final static int BUFSIZE = 4096 * 8;
private final static int BUFSIZE_MASK = BUFSIZE - 1;
static int offset,buf_byte_idx;
private static final int[] buf = new int[BUFSIZE];
static int buf_bit_idx;
public static int totbit;
//public int hsstell() {
// return totbit;
//}
public final int hgetbits(int N) {
totbit += N;
val=0;
if (buf_byte_idx + N < BUFSIZE) {
while (N-- > 0) {
val <<= 1;
val |= ((buf[buf_byte_idx++] == 0) ? 0 : 1);
}
}
else {
while (N-- > 0) {
val <<= 1;
val |= ((buf[buf_byte_idx] == 0) ? 0 : 1);
buf_byte_idx = (buf_byte_idx + 1) & BUFSIZE_MASK;
}
}
return val;
}
static int val;
public final int hget1bit() {
totbit++;
val = buf[buf_byte_idx];
buf_byte_idx = (buf_byte_idx + 1) & BUFSIZE_MASK;
return val;
}
public final void hputbuf(int val) {
buf[offset++] = val & 0x80;
buf[offset++] = val & 0x40;
buf[offset++] = val & 0x20;
buf[offset++] = val & 0x10;
buf[offset++] = val & 0x08;
buf[offset++] = val & 0x04;
buf[offset++] = val & 0x02;
buf[offset++] = val & 0x01;
if (offset == BUFSIZE)
offset = 0;
}
public final void rewindNbits(int N) {
totbit -= N;
buf_byte_idx -= N;
if (buf_byte_idx < 0) {
buf_byte_idx += BUFSIZE;
}
}
static int bits;
public final void rewindNbytes(int N) {
bits = (N << 3);
totbit -= bits;
buf_byte_idx -= bits;
if (buf_byte_idx < 0) {
buf_byte_idx += BUFSIZE;
}
}
}
?? 快捷鍵說(shuō)明
復(fù)制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號(hào)
Ctrl + =
減小字號(hào)
Ctrl + -