util/stream/walk.cpp


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#include "walk.h" 
 
#include <util/generic/string.h>

void IWalkInput::DoUndo(size_t len) {
    Len_ += len;
    Buf_ = static_cast<const char*>(Buf_) - len;
}

size_t IWalkInput::DoNext(const void** ptr, size_t len) {
    if (!Len_) { 
        Len_ = DoUnboundedNext(&Buf_); 
    } 
 
    len = Min(Len_, len); 
    *ptr = Buf_; 
 
    Buf_ = static_cast<const char*>(Buf_) + len; 
    Len_ -= len; 
 
    return len; 
}