io_buffer.cpp File Reference

#include <stdio.h>
#include <assert.h>
#include "midas.h"
#include "mucap_compress.h"

Go to the source code of this file.

Functions
void	start_output_buffer (io_buffer *buffer, unsigned char *p)
int	flush_output_buffer (io_buffer *buffer)
void	io_buffer_put (io_buffer *buffer, unsigned int code_bits, int code_length)
void	start_input_buffer (io_buffer *buffer, unsigned char *p)
unsigned int	io_buffer_get (io_buffer *buffer, int num_bits)

Function Documentation

int flush_output_buffer

(

io_buffer *

buffer)

Definition at line 23 of file io_buffer.cpp.

References io_buffer::num_codes, io_buffer::p, io_buffer::start, io_buffer::w, and io_buffer::w_bits.

Referenced by encode_caen(), encode_cmp_times(), encode_fadc(), encode_hits(), encode_n2fadc_ndet(), encode_n2fadc_tpc(), encode_nfadc(), encode_times(), and flush_rle().

{
  // store the last word
  *((buffer->p)++) = buffer->w << buffer->w_bits;

  // remember the length of the buffer, in bytes and in codes
  *(buffer->start) = buffer->num_codes;

  //return ((unsigned int) buffer->p) - ((unsigned int) buffer->start);
  return (int) (((char *) buffer->p) - ((char *) buffer->start));
}

unsigned int io_buffer_get	(	io_buffer *	buffer,
		int	num_bits
	)

Definition at line 70 of file io_buffer.cpp.

References io_buffer_get(), io_buffer::p, io_buffer::w, and io_buffer::w_bits.

Referenced by decode_caen(), decode_cmp_times(), decode_fadc(), decode_hits(), decode_n2fadc_ndet(), decode_n2fadc_tpc(), decode_nfadc(), decode_times(), io_buffer_get(), and rle_get().

{
  if (buffer->w_bits == 0) {
    buffer->w = *((buffer->p)++);
    buffer->w_bits = 32;
  }

  int w_bits = buffer->w_bits;

  unsigned int retval;
  if (num_bits <= w_bits) {
    retval = buffer->w >> (32 - num_bits);
    buffer->w = buffer->w << num_bits;
    buffer->w_bits = w_bits - num_bits;

  } else {
    unsigned int first_part =
        io_buffer_get(buffer, w_bits) << (num_bits - w_bits);
    retval = first_part | io_buffer_get(buffer, num_bits - w_bits);
  }

  return retval;
}

void io_buffer_put	(	io_buffer *	buffer,
		unsigned int	code_bits,
		int	code_length
	)

Definition at line 36 of file io_buffer.cpp.

References io_buffer::p, io_buffer::w, and io_buffer::w_bits.

Referenced by encode_caen(), encode_cmp_times(), encode_fadc(), encode_hits(), encode_n2fadc_ndet(), encode_n2fadc_tpc(), encode_nfadc(), encode_times(), flush_rle(), huffman_put_symbol(), and rle_put().

{

  assert(code_length > 0 && code_length < 32);

  // Does this symbol fit in our buffer word?
  if (code_length < buffer->w_bits) {
    // OK, so put it there...
    buffer->w = (buffer->w << code_length) | code_bits;
    buffer->w_bits -= code_length;
  } else if (code_length == buffer->w_bits) {
    // Only barely...write out the buffer word
    buffer->w = (buffer->w << code_length) | code_bits;
    *((buffer->p)++) = buffer->w;
    buffer->w_bits = 32;
  } else {
    // No, we'll have to split the code across two words.
    unsigned int first_code_bits =
        code_bits >> (code_length - buffer->w_bits);
    *((buffer->p)++) = (buffer->w << buffer->w_bits) | first_code_bits;
    buffer->w = code_bits;
    buffer->w_bits = 32 - code_length + buffer->w_bits;
  }
}

void start_input_buffer	(	io_buffer *	buffer,
		unsigned char *	p
	)

Definition at line 61 of file io_buffer.cpp.

References io_buffer::num_codes, io_buffer::p, io_buffer::start, io_buffer::w, and io_buffer::w_bits.

Referenced by caen_expand(), cmp_expand(), fadc_expand(), hits_expand(), n2fadc_ndet_expand(), n2fadc_tpc_expand(), nfadc_expand(), stck_expand(), and tdc400_expand().

{
  buffer->w = 0;
  buffer->w_bits = 0;
  buffer->start = (unsigned int *) p;
  buffer->p = buffer->start + 1;
  buffer->num_codes = *(buffer->start);
}

void start_output_buffer	(	io_buffer *	buffer,
		unsigned char *	p
	)

Definition at line 14 of file io_buffer.cpp.

References io_buffer::num_codes, io_buffer::p, io_buffer::start, io_buffer::w, and io_buffer::w_bits.

Referenced by caen_compress(), cmp_compress(), fadc_compress(), hits_compress(), n2fadc_ndet_compress(), n2fadc_tpc_compress(), nfadc_compress(), stck_compress(), and tdc400_compress().

{
  buffer->w = 0;
  buffer->w_bits = 32;
  buffer->start = (unsigned int *) p;
  buffer->p = buffer->start + 1;
  buffer->num_codes = 0;
}