fpa1_rdf.c File Reference

Contains functions to read MHEG-5 ASN.1 scripts. More...

#include <stdio.h>
#include <stdlib.h>
#include "vpa1_rdf.h"
#include "vpa1_sys.h"
#include "vpa1_tgs.h"
#include "fpa1_cho.h"
#include "fpa1_rdf.h"
#include "fpa1_syn.h"
#include "pa1_mem.h"
#include "fpa1_BlockAlloc.h"
#include "glue_debug.h"

Macros
#define	CLASS_SHIFT   6
#define	TAG_BASE_SHIFT   7
#define	LONG_LENGTH_BASE_SHIFT   8
#define	SMALL_TAG_MASK   0x1F
#define	LARGE_TAG_MASK   0x7F
#define	LAST_TAG_OCTET_MASK   0x80
#define	LONG_LENGTH_TEST_MASK   0x80
#define	LONG_LENGTH_MASK   0x7F
#define	INT_OBJ_CHOICE_COMPS   2

Functions
int	fpa1_rdfGetTag (void)
vpa1_filePos	fpa1_rdfGetContentLength (void)
vpa1_filePos	fpa1_rdfGetCurrentFilePosition (void)
int	fpa1_rdfGetNextByte (void)
int	fpa1_rdfGetInteger (vpa1_filePos intLength)
void	fpa1_rdfMoveToContents (void)
vpa1_filePos	fpa1_rdfGetNextTagPosn (void)
int	fpa1_rdfSetNewFilePosition (vpa1_filePos newPosition)
int	fpa1_rdfGetByteAbsolute (vpa1_filePos pos)
int	fpa1_rdfGetIntegerAbsolute (vpa1_filePos pos, int intLength)
int	fpa1_rdfGetBooleanAbsolute (vpa1_filePos pos)
fpa1_syntaxList *	fpa1_parseScriptASN (unsigned char *asndata, unsigned long len)
	Top level entry point to the ASN.1 script to fpa1_syntaxList converter. This function takes the original ASN.1 script as a character array and returns a pointer to a syntax list representing the contents of the ASN.1 script. More...

Variables
unsigned char *	fpa1_outputBufferStart = NULL
unsigned long	fpa1_outputBufferOffset = 0
unsigned char *	fpa1_currentBufferStart = NULL
unsigned long	fpa1_currentBufferLength = 0
unsigned long	fpa1_currentBufferOffset = 0
int	fpa1_GenericDataCount = 0
int	fpa1_GroupActionCount = 0
int	fpa1_GroupParamCount = 0

Detailed Description

Contains functions to read MHEG-5 ASN.1 scripts.

Date

01/02/2002

Author

R.Freeman

Macro Definition Documentation

#define CLASS_SHIFT   6

#define INT_OBJ_CHOICE_COMPS   2

#define LARGE_TAG_MASK   0x7F

#define LAST_TAG_OCTET_MASK   0x80

#define LONG_LENGTH_BASE_SHIFT   8

#define LONG_LENGTH_MASK   0x7F

#define LONG_LENGTH_TEST_MASK   0x80

#define SMALL_TAG_MASK   0x1F

#define TAG_BASE_SHIFT   7

Function Documentation

fpa1_syntaxList* fpa1_parseScriptASN	(	unsigned char *	asndata,
		unsigned long	len
	)

Top level entry point to the ASN.1 script to fpa1_syntaxList converter. This function takes the original ASN.1 script as a character array and returns a pointer to a syntax list representing the contents of the ASN.1 script.

Parameters

asndata	ASN.1 script (as character array)
len	Length of asn.1 script.

Returns

*fpa1_syntaxList

int fpa1_rdfGetBooleanAbsolute

(

vpa1_filePos

pos

)

Gets a boolean from the current ASN.1 file buffer. Does no range checking.

Parameters

pos	file position for read

Returns

int

int fpa1_rdfGetByteAbsolute

(

vpa1_filePos

pos

)

Gets a byte from the current ASN.1 file buffer.

Parameters

pos	file position for read

Returns

int

vpa1_filePos fpa1_rdfGetContentLength

(

void

)

Returns

vpa1_filePos fpa1_rdfGetCurrentFilePosition

(

void

)

Returns

int fpa1_rdfGetInteger

(

vpa1_filePos

intLength

)

Returns

int fpa1_rdfGetIntegerAbsolute	(	vpa1_filePos	pos,
		int	intLength
	)

Gets an integer (in hex format) from the current ASN.1 file buffer.

Parameters

pos	file position for read.
tLength	in Number of bytes representing the integer (between 1 and 4)

Returns

int

int fpa1_rdfGetNextByte

(

void

)

Returns

vpa1_filePos fpa1_rdfGetNextTagPosn

(

void

)

Returns

int fpa1_rdfGetTag

(

void

)

Returns

void fpa1_rdfMoveToContents

(

void

)

strPtr must point to an array of length + 1 (to allow for teh NULL char).

Returns

int fpa1_rdfSetNewFilePosition

(

vpa1_filePos

newPosition

)

To be used only to set tag positions.

Returns

Variable Documentation

unsigned long fpa1_currentBufferLength = 0

unsigned long fpa1_currentBufferOffset = 0

unsigned char* fpa1_currentBufferStart = NULL

int fpa1_GenericDataCount = 0

int fpa1_GroupActionCount = 0

int fpa1_GroupParamCount = 0

unsigned long fpa1_outputBufferOffset = 0

unsigned char* fpa1_outputBufferStart = NULL