TBL missing branch coverage of run-time endian logic (and sometimes line)

[skliper]

Is your feature request related to a problem? Please describe.
TBL suffers from the unfortunate pattern of run time checks for endian (and associated logic), which leads to uncovered branches and possibly uncovered code (depending on endian of platform).

    1158         [ +  - ]:         33 :                     if ((*(char *)&EndianCheck) == 0x04)
    1159                 :            :                     {
    1160                 :            :                         /* If this is a little endian processor, then the standard cFE Table Header,   */
    1161                 :            :                         /* which is in big endian format, must be swapped so that the data is readable */
    1162                 :         33 :                         CFE_TBL_ByteSwapTblHeader(TblFileHeaderPtr);
    1163                 :            :                     }

cFE/modules/tbl/fsw/src/cfe_tbl_internal.c

Lines 1158 to 1163 in 5e41330

	if ((*(char *)&EndianCheck) == 0x04)
	{
	/* If this is a little endian processor, then the standard cFE Table Header, */
	/* which is in big endian format, must be swapped so that the data is readable */
	CFE_TBL_ByteSwapTblHeader(TblFileHeaderPtr);
	}

same pattern in:

cFE/modules/tbl/fsw/src/cfe_tbl_task_cmds.c

Lines 740 to 748 in 5e41330

	/* Determine if this is a little endian processor */
	if ((*(char *)&EndianCheck) == 0x04)
	{
	/* If this is a little endian processor, then byte swap the header to a big endian format */
	/* to maintain the cFE Header standards */
	/* NOTE: FOR THE REMAINDER OF THIS FUNCTION, THE CONTENTS OF THE HEADER IS UNREADABLE BY */
	/* THIS PROCESSOR! THE DATA WOULD NEED TO BE SWAPPED BACK BEFORE READING. */
	CFE_TBL_ByteSwapTblHeader(&TblFileHeader);
	}

Describe the solution you'd like
Complete coverage is possible if run on each system, but should be resolved in the future. Possibly in concert with #1209 and related abstraction such that this code doesn't care (whatever underlying API/implementation that handles raw data should do the appropriate conversion).

Describe alternatives you've considered
None

Additional context
Same as #1882 for FS

Requester Info
Jacob Hageman - NASA/GSFC

[avan989]

comment same as #1882