Code39_Decode

Files
file	decode-39.c
	Code 39 Decode.
Enumerations
enum	{ STANDARD, SPECIAL }
Functions
unsigned short	Decode39 (struct BC_STRUCT *p)
	Code 39 decode routine.

---

Enumeration Type Documentation

anonymous enum

Enumerator:

STANDARD
SPECIAL

Definition at line 90 of file decode-39.c.

{STANDARD, SPECIAL};

---

Function Documentation

unsigned short Decode39

(

struct BC_STRUCT *

p

)

Code 39 decode routine.

Parameters:

p

points to channel context

Returns:

0 if unable to decode, else decoded character count

Definition at line 107 of file decode-39.c.

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

{
    // Minimum sample count
    if(p->sample_ctr < 27){
        return  0;      
        }

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

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

    // Unable to decode
    return 0;
}