CodeI25_Decode

Files
file	decode-I25.c
	Code I2/5 Decode.
Enumerations
enum	{ STANDARD, SPECIAL }
Functions
unsigned short	DecodeI25 (struct BC_STRUCT *p, unsigned char length)
	Code 39 decode routine.

---

Enumeration Type Documentation

anonymous enum

Enumerator:

STANDARD
SPECIAL

Definition at line 86 of file decode-I25.c.

{STANDARD, SPECIAL};

---

Function Documentation

unsigned short DecodeI25	(	struct BC_STRUCT *	p,
		unsigned char	length
	)

Code 39 decode routine.

Parameters:

	p	points to channel context
	length	specifies the decode length

Returns:

0 if unable to decode, else decoded character count

Definition at line 105 of file decode-I25.c.

References BC_STRUCT::decode_count, BC_STRUCT::sample_buffer, BC_STRUCT::sample_ctr, BC_STRUCT::sample_ptr, SPECIAL, and STANDARD.

{
    // Check the input length
    if(length == 0 || length > MAX_DECODE){
        return 0;
    }

    // Leave if insufficent number of samples
    if(p->sample_ctr < ((length * 5) + 7)){
        return 0;
    }

    // Sstandard reference
    p->sample_ptr = &p->sample_buffer[0];
    if(FindStart(p, length) != NO_CODE){
        if(Decode(p, length, STANDARD) != NO_DECODE){
            return p->decode_count;
        }
    }

    // Special reference
    p->sample_ptr = &p->sample_buffer[0];
    if(FindStart(p, length) != NO_CODE){
        if(Decode(p, length, SPECIAL) != NO_DECODE){
            return p->decode_count;
        }
    }

    // Unable to decode
    return NO_DECODE;
}