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Reduce code-size of mbedtls_asn1_get_sequence_of()

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Reduce nesting of branches and remove unnecessary check at the end
of the routine.
This commit is contained in:
Hanno Becker 2019-02-20 14:43:55 +00:00
parent b5419867cd
commit f226998fa2
1 changed files with 11 additions and 16 deletions
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27
library/asn1parse.c
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@ -251,7 +251,7 @@ int mbedtls_asn1_get_sequence_of( unsigned char **p,
if( *p + len != end )
return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
while( *p < end )
while( 1 )
{
buf = &(cur->buf);
buf->tag = **p;
@ -262,25 +262,20 @@ int mbedtls_asn1_get_sequence_of( unsigned char **p,
buf->p = *p;
*p += buf->len;
/* Allocate and assign next pointer */
if( *p < end )
if( *p == end )
{
cur->next = (mbedtls_asn1_sequence*)mbedtls_calloc( 1,
sizeof( mbedtls_asn1_sequence ) );
if( cur->next == NULL )
return( MBEDTLS_ERR_ASN1_ALLOC_FAILED );
cur = cur->next;
cur->next = NULL;
break;
}
cur->next = (mbedtls_asn1_sequence*)mbedtls_calloc( 1,
sizeof( mbedtls_asn1_sequence ) );
if( cur->next == NULL )
return( MBEDTLS_ERR_ASN1_ALLOC_FAILED );
cur = cur->next;
}
/* Set final sequence entry's next pointer to NULL */
cur->next = NULL;
if( *p != end )
return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
return( 0 );
}