std::mem::find_sequence/find_sequence_in_range/find_string_in_range fails when sequence exists across read block boundaries

[matkinsuva]

Hello,

As in title, the code linked below appears to search through the data in blocks of 4K bytes.

PatternLanguage/lib/source/pl/lib/std/mem.cpp

Line 26 in 7729025

for (u64 offset = offsetFrom; offset < offsetTo; offset += bytes.size()) {

If the sequence spans two blocks, then the function will miss it.

I am seeing what could be the effect of this where if I change the start offset value the find_string_in_range function will return -1 or the actual position.

Thanks