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AK: Fix MemoryStream seek from end

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The seek offset is still applied positively when seeking from the end;
see the Kernel's seek implementation.
This commit is contained in:
kleines Filmröllchen 2023-09-14 11:24:55 +02:00 • committed by Andrew Kaster
parent 784ac6b9f2
commit 8bcf25561b
2 changed files with 98 additions and 2 deletions
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4
AK/MemoryStream.cpp
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@ -81,10 +81,10 @@ ErrorOr<size_t> FixedMemoryStream::seek(i64 offset, SeekMode seek_mode)
m_offset += offset;
break;
case SeekMode::FromEndPosition:
if (offset > static_cast<i64>(m_bytes.size()))
if (-offset > static_cast<i64>(m_bytes.size()))
return Error::from_string_view_or_print_error_and_return_errno("Offset past the start of the stream memory"sv, EINVAL);
m_offset = m_bytes.size() - offset;
m_offset = m_bytes.size() + offset;
break;
}
return m_offset;