BitBuffer [1033635]

< > BotCompany Repo | #1033635 // BitBuffer

JavaX fragment (include) [tags: use-pretranspiled]

Transpiled version (10076L) is out of date.

// little-endian
persistable sclass BitBuffer is IntSize {
  new ByteBuffer byteBuffer; // TODO (optimization): use a growing circular buffer
  int currentByte, currentBit;
  
  void add(int b) {
    add(odd(b));
  }
  
  void add(bool b) {
    if (b) currentByte |= 1 << currentBit;
    if (currentBit == 7) {
      byteBuffer.add((byte) currentByte);
      currentByte = 0;
      currentBit = 0;
    } else
      ++currentBit;
  }
  
  bool get(int iBit) {
    int iByte = iBit >> 3;
    int theByte = iByte == byteBuffer.size()
      ? currentByte 
      : byteBuffer.get(iByte);
    ret (theByte & (1 << (iBit & 7))) != 0;
  }
  
  bool hasFullByte() {
    ret !byteBuffer.isEmpty();
  }
  
  byte popFullByte() {
    ret byteBuffer.popFirst();
  }
  
  public int size() {
    ret byteBuffer.size()*8 + currentBit;
  }
  
  // TODO: optimize void writeBits(int data, int nBits)
}

Author comment

Began life as a copy of #1033633

Travelled to 4 computer(s): bhatertpkbcr, ekrmjmnbrukm, mowyntqkapby, mqqgnosmbjvj

Snippet ID:

#1033635

Snippet name:

BitBuffer

Eternal ID of this version:

#1033635/11

Text MD5:

3191ebed21c01e1607855c5e3616506e

Author:

stefan

Category:

javax / io

Type:

JavaX fragment (include)

Public (visible to everyone):

Yes

Archived (hidden from active list):

Created/modified:

2022-11-30 18:31:39

Source code size:

924 bytes / 41 lines

Pitched / IR pitched:

No / No

Views / Downloads:

122 / 278

Version history:

10 change(s)

Referenced in:

[show references]

1	// little-endian
2	persistable sclass BitBuffer is IntSize {
3	new ByteBuffer byteBuffer; // TODO (optimization): use a growing circular buffer
4	int currentByte, currentBit;
5
6	void add(int b) {
7	add(odd(b));
8	}
9
10	void add(bool b) {
11	if (b) currentByte \|= 1 << currentBit;
12	if (currentBit == 7) {
13	byteBuffer.add((byte) currentByte);
14	currentByte = 0;
15	currentBit = 0;
16	} else
17	++currentBit;
18	}
19
20	bool get(int iBit) {
21	int iByte = iBit >> 3;
22	int theByte = iByte == byteBuffer.size()
23	? currentByte
24	: byteBuffer.get(iByte);
25	ret (theByte & (1 << (iBit & 7))) != 0;
26	}
27
28	bool hasFullByte() {
29	ret !byteBuffer.isEmpty();
30	}
31
32	byte popFullByte() {
33	ret byteBuffer.popFirst();
34	}
35
36	public int size() {
37	ret byteBuffer.size()*8 + currentBit;
38	}
39
40	// TODO: optimize void writeBits(int data, int nBits)
41	}