misc.c File Reference

#include <ctype.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <vdr/tools.h>
#include <vdr/thread.h>
#include "misc.h"

Go to the source code of this file.

Defines
#define	CRCPOLY_LE   0xedb88320
Functions
const char *	HexStr (char *str, const unsigned char *mem, int len)
static int	HexDigit (int asc)
int	GetChar (const char *&line, int *store, int count)
static int	GetHexBase (const char *&line, unsigned char *store, int count, bool fixedLen, bool asc)
int	GetHex (const char *&line, unsigned char *store, int count, bool fixedLen)
int	GetHexAsc (const char *&line, unsigned char *store, int count)
unsigned long long	Bin2LongLong (unsigned char *mem, int len)
bool	CheckNull (const unsigned char *data, int len)
bool	CheckFF (const unsigned char *data, int len)
void	SetSctLen (unsigned char *data, int len)
unsigned char	XorSum (const unsigned char *mem, int len)
char *	bprintf (const char *fmt,...)
unsigned int	crc32_le (unsigned int crc, unsigned char const *p, int len)

---

Define Documentation

#define CRCPOLY_LE   0xedb88320

Definition at line 144 of file misc.c.

Referenced by crc32_le().

---

Function Documentation

unsigned long long Bin2LongLong	(	unsigned char *	mem,
		int	len
	)

Definition at line 96 of file misc.c.

References i, and k.

{
  unsigned long long k=0;
  for(int i=0 ; i<len ; i++) { k<<=8; k+=mem[i]; }
  return k;
}

char* bprintf	(	const char *	fmt,
			...
	)

Definition at line 128 of file misc.c.

{
  va_list ap;
  va_start(ap,fmt);
  char *str=0;
  if(vasprintf(&str,fmt,ap)<0);
  va_end(ap);
  return str;
}

bool CheckFF	(	const unsigned char *	data,
		int	len
	)

Definition at line 109 of file misc.c.

{
  while(--len>=0) if(data[len]!=0xFF) return false;
  return true;
}

bool CheckNull	(	const unsigned char *	data,
		int	len
	)

Definition at line 103 of file misc.c.

{
  while(--len>=0) if(data[len]) return false;
  return true;
}

unsigned int crc32_le	(	unsigned int	crc,
		unsigned char const *	p,
		int	len
	)

Definition at line 146 of file misc.c.

References CRCPOLY_LE, and i.

{
  crc^=0xffffffff; // zlib mod
  while(len--) {
    crc^=*p++;
    for(int i=0; i<8; i++)
      crc=(crc&1) ? (crc>>1)^CRCPOLY_LE : (crc>>1);
    }
  crc^=0xffffffff; // zlib mod
  return crc;
}

int GetChar	(	const char *&	line,
		int *	store,
		int	count
	)

Definition at line 44 of file misc.c.

References skipspace().

{
  line=skipspace(line);
  const char *sline=line;
  *store=0;
  while(count) {
    if(line[0]==0 || !isalnum(line[0])) break;
    *store<<=8; *store+=line[0];
    line++; count--;
    }
  if(!count && (!*line || isspace(*line) || *line==';')) return sline-line;
  *store=0;
  line=sline;
  return 0;
}

int GetHex	(	const char *&	line,
		unsigned char *	store,
		int	count,
		bool	fixedLen
	)

Definition at line 86 of file misc.c.

References GetHexBase().

{
  return GetHexBase(line,store,count,fixedLen,false);
}

int GetHexAsc	(	const char *&	line,
		unsigned char *	store,
		int	count
	)

Definition at line 91 of file misc.c.

References GetHexBase().

{
  return GetHexBase(line,store,count/2,true,true)*2;
}

static int GetHexBase	(	const char *&	line,
		unsigned char *	store,
		int	count,
		bool	fixedLen,
		bool	asc
	)		[static]

Definition at line 60 of file misc.c.

References count, HexDigit(), and skipspace().

Referenced by GetHex(), and GetHexAsc().

{
  line=skipspace(line);
  const char *sline=line;
  unsigned char *sstore=store;
  int scount=count;
  while(count) {
    if(line[0]==0 || line[1]==0 || !isxdigit(line[0]) || !isxdigit(line[1])) break;
    if(asc) {
       *store++=line[0]; *store++=line[1];
       }
    else {
      int d1=HexDigit(line[0]);
      int d0=HexDigit(line[1]);
      *store++=(d1<<4) + d0;
      }
    line+=2; count--;
    }
  if(asc) *store=0; // make sure strings are NULL terminated
  if((!count || (!fixedLen && count!=scount)) &&
     (!*line || isspace(*line) || *line==';' || *line==']' || *line=='/') ) return scount-count;
  memset(sstore,0,scount);
  line=sline;
  return 0;
}

static int HexDigit

(

int

asc

)

[static]

Definition at line 38 of file misc.c.

Referenced by GetHexBase().

{
  if(asc>='A') return toupper(asc)-'A'+10;
  return asc-'0';
}

const char* HexStr	(	char *	str,
		const unsigned char *	mem,
		int	len
	)

Definition at line 32 of file misc.c.

References i.

{
  for(int i=0 ; i<len ; i++) sprintf(&str[i*2],"%02X",mem[i]);
  return str;
}

void SetSctLen	(	unsigned char *	data,
		int	len
	)

Definition at line 115 of file misc.c.

{
  data[1]=(len>>8) | 0x70;
  data[2]=len & 0xFF;
}

unsigned char XorSum	(	const unsigned char *	mem,
		int	len
	)

Definition at line 121 of file misc.c.

References cs.

{
  unsigned char cs=0;
  while(len>0) { cs ^= *mem++; len--; }
  return cs;
}