hamm.c File Reference

#include "vt.h"
#include "hamm.h"

Include dependency graph for hamm.c:

Go to the source code of this file.

Functions
int	hamm8 (const unsigned char *p, int *err)
int	hamm16 (const unsigned char *p, int *err)
int	hamm24 (const unsigned char *p, int *err)
int	chk_parity (unsigned char *p, int n)

Variables
static unsigned short	hammtab [256]
static char	hamm24par [3][256]
static char	hamm24val [256]
static short	hamm24err [64]
static int	hamm24cor [64]

Function Documentation

hamm8()

int hamm8	(	const unsigned char *	p,
		int *	err
	)

Definition at line 199 of file hamm.c.

Referenced by TeletextReader::AddTeletextData(), and vt_line().

hamm16()

int hamm16	(	const unsigned char *	p,
		int *	err
	)

Definition at line 207 of file hamm.c.

Referenced by TeletextReader::AddTeletextData(), TeletextDecoder::Decode(), and vt_line().

hamm24()

int hamm24	(	const unsigned char *	p,
		int *	err
	)

Definition at line 217 of file hamm.c.

Referenced by vt_line().

chk_parity()

int chk_parity	(	unsigned char *	p,
		int	n
	)

Definition at line 227 of file hamm.c.

Referenced by vt_line().

Variable Documentation

hammtab

unsigned short hammtab[256]

static

Definition at line 13 of file hamm.c.

Referenced by hamm16(), and hamm8().

hamm24par

char hamm24par[3][256]

static

Definition at line 81 of file hamm.c.

Referenced by chk_parity(), and hamm24().

hamm24val

char hamm24val[256]

static

Initial value:

=
{
      0,  0,  0,  0,  1,  1,  1,  1,  0,  0,  0,  0,  1,  1,  1,  1,
      2,  2,  2,  2,  3,  3,  3,  3,  2,  2,  2,  2,  3,  3,  3,  3,
      4,  4,  4,  4,  5,  5,  5,  5,  4,  4,  4,  4,  5,  5,  5,  5,
      6,  6,  6,  6,  7,  7,  7,  7,  6,  6,  6,  6,  7,  7,  7,  7,
      8,  8,  8,  8,  9,  9,  9,  9,  8,  8,  8,  8,  9,  9,  9,  9,
     10, 10, 10, 10, 11, 11, 11, 11, 10, 10, 10, 10, 11, 11, 11, 11,
     12, 12, 12, 12, 13, 13, 13, 13, 12, 12, 12, 12, 13, 13, 13, 13,
     14, 14, 14, 14, 15, 15, 15, 15, 14, 14, 14, 14, 15, 15, 15, 15,
      0,  0,  0,  0,  1,  1,  1,  1,  0,  0,  0,  0,  1,  1,  1,  1,
      2,  2,  2,  2,  3,  3,  3,  3,  2,  2,  2,  2,  3,  3,  3,  3,
      4,  4,  4,  4,  5,  5,  5,  5,  4,  4,  4,  4,  5,  5,  5,  5,
      6,  6,  6,  6,  7,  7,  7,  7,  6,  6,  6,  6,  7,  7,  7,  7,
      8,  8,  8,  8,  9,  9,  9,  9,  8,  8,  8,  8,  9,  9,  9,  9,
     10, 10, 10, 10, 11, 11, 11, 11, 10, 10, 10, 10, 11, 11, 11, 11,
     12, 12, 12, 12, 13, 13, 13, 13, 12, 12, 12, 12, 13, 13, 13, 13,
     14, 14, 14, 14, 15, 15, 15, 15, 14, 14, 14, 14, 15, 15, 15, 15
}

Definition at line 141 of file hamm.c.

Referenced by hamm24().

hamm24err

short hamm24err[64]

static

Initial value:

=
{
    0x0000, 0x1000, 0x1000, 0x1000, 0x1000, 0x1000, 0x1000, 0x1000,
    0x1000, 0x1000, 0x1000, 0x1000, 0x1000, 0x1000, 0x1000, 0x1000,
    0x1000, 0x1000, 0x1000, 0x1000, 0x1000, 0x1000, 0x1000, 0x1000,
    0x1000, 0x1000, 0x1000, 0x1000, 0x1000, 0x1000, 0x1000, 0x1000,
    0x0100, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100,
    0x0100, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100,
    0x0100, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100, 0x0100,
    0x1000, 0x1000, 0x1000, 0x1000, 0x1000, 0x1000, 0x1000, 0x1000,
}

Definition at line 167 of file hamm.c.

Referenced by hamm24().

hamm24cor

int hamm24cor[64]

static

Initial value:

=
{
    0x00000, 0x00000, 0x00000, 0x00000, 0x00000, 0x00000, 0x00000, 0x00000,
    0x00000, 0x00000, 0x00000, 0x00000, 0x00000, 0x00000, 0x00000, 0x00000,
    0x00000, 0x00000, 0x00000, 0x00000, 0x00000, 0x00000, 0x00000, 0x00000,
    0x00000, 0x00000, 0x00000, 0x00000, 0x00000, 0x00000, 0x00000, 0x00000,
    0x00000, 0x00000, 0x00000, 0x00001, 0x00000, 0x00002, 0x00004, 0x00008,
    0x00000, 0x00010, 0x00020, 0x00040, 0x00080, 0x00100, 0x00200, 0x00400,
    0x00000, 0x00800, 0x01000, 0x02000, 0x04000, 0x08000, 0x10000, 0x20000,
    0x00000, 0x00000, 0x00000, 0x00000, 0x00000, 0x00000, 0x00000, 0x00000,
}

Definition at line 184 of file hamm.c.

Referenced by hamm24().