[mythtv] This piece of code is driving me nuts!

[Karl Dietz]

On 18.11.2016 18:53, roger wrote:
> This piece of code in mpgestreamdata.cpp is driving me nuts.
>
> void init_sections(sections_t &sect, uint last_section)
>
> {
>
> static const unsigned char init_bits[8] =
>
> { 0xfe, 0xfc, 0xf8, 0xf0, 0xe0, 0xc0, 0x80, 0x00, };
>
> sect.clear();
>
> uint endz = last_section >> 3;
>
> if (endz)
>
> sect.resize(endz, 0x00);
>
> sect.resize(32, 0xff);
>
> sect[endz] = init_bits[last_section & 0x7];
>
> }

It creates a vector of 256bits packed into 32 unsigned chars of 8 bits.
(256 being the maximum number of sections)
Then initializes last_section bits to 0 and 256-last_section bits to 1.

Later it looks at each received section and sets the corresponding
bits. Once all bits are set we have collected the whole table.

Regards,
Karl