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Update mapVBVD.m: speed up loop_mdh_read() #113

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Update mapVBVD.m: speed up loop_mdh_read() #113

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11 changes: 8 additions & 3 deletions inputOutput/mapVBVD/mapVBVD.m
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Original file line number Diff line number Diff line change
Expand Up @@ -619,7 +619,7 @@
% ======================================
bit_0 = uint8(2^0);
bit_5 = uint8(2^5);
mdhStart = 1-byteMDH;
% mdhStart = 1-byteMDH;

u8_000 = zeros( 3, 1, 'uint8'); % for comparison with data_u8(1:3)

Expand Down Expand Up @@ -655,8 +655,13 @@

try
% read everything and cut out the mdh
data_u8 = fread( fid, ulDMALength, 'uint8=>uint8' );
data_u8 = data_u8( mdhStart+end : end );
% data_u8 = fread( fid, ulDMALength, 'uint8=>uint8' );
% data_u8 = data_u8( mdhStart+end : end );

% much faster to skip when ulDMALength is large, by Xiangrui Li
fseek ( fid, ulDMALength-byteMDH, 'cof' );
data_u8 = fread( fid, byteMDH, 'uint8=>uint8' );

catch exc
warning( [mfilename() ':UnxpctdEOF'], ...
[ '\nAn unexpected read error occurred at this byte offset: %d (%g GiB)\n'...
Expand Down