TW-TS-005 reader: fix maximum line length bug TW-TS-005 section 4.1 states: The maximum allowed length of each line is 80 characters, not including the OS-specific newline encoding. The implementation of this line length limit in the TW-TS-005 hex file reader function in the present suite was wrong, such that lines of the full maximum length could not be read. Fix it. Note that this bug affects comment lines too, not just actual RTP payloads. Neither Annex A nor Annex B features an RTP payload format that goes to the maximum of 40 bytes, but if a comment line goes to the maximum allowed length of 80 characters not including the terminating newline, the bug will be triggered, necessitating the present fix.

/*
 * The function implemented in this module groks the first octet of
 * an RFC 4867 payload and tells the calling application how many more
 * bytes need to be read, or if the frame type is invalid.
 */

#include <stdint.h>
#include "tw_amr.h"

static const uint8_t extra_bytes_per_ft[9] =
		{12, 13, 15, 17, 19, 20, 26, 31, 5};

int amr_ietf_grok_first_octet(uint8_t fo)
{
	uint8_t ft;

	ft = (fo & 0x78) >> 3;
	if (ft == AMR_FT_NODATA)
		return 0;
	if (ft > MRDTX)
		return -1;
	return extra_bytes_per_ft[ft];
}