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Function silc_buffer_pull SYNOPSIS
        static inline
        unsigned char *silc_buffer_pull(SilcBuffer sb, SilcUInt32 len);
DESCRIPTION
        Pulls current data area towards end. The length of the currently
        valid data area is also decremented. Returns pointer to the data
        area before pulling. Returns NULL on error.
EXAMPLE
        ---------------------------------
        | head  | data       | tail     |
        ---------------------------------
                ^
                Pulls the start of the data area.

        ---------------------------------
        | head     | data    | tail     |
        ---------------------------------
                ^

        silc_buffer_pull(sb, 20);
SILC Buffer Interface SilcBuffer silc_buffer_data silc_buffer_datalen silc_buffer_truelen silc_buffer_len silc_buffer_headlen silc_buffer_taillen silc_buffer_alloc silc_buffer_free silc_buffer_steal silc_buffer_purge silc_buffer_set silc_buffer_pull silc_buffer_push silc_buffer_pull_tail silc_buffer_push_tail silc_buffer_put_head silc_buffer_put silc_buffer_put_tail silc_buffer_alloc_size silc_buffer_reset silc_buffer_clear silc_buffer_start silc_buffer_end silc_buffer_copy silc_buffer_clone silc_buffer_realloc silc_buffer_realloc_size silc_buffer_enlarge silc_buffer_salloc silc_buffer_salloc_size silc_buffer_srealloc silc_buffer_srealloc_size silc_buffer_senlarge silc_buffer_scopy silc_buffer_sclone

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