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AK: Add search-related helpers to CircularBuffer

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This factors out a lot of complicated math into somewhat understandable
functions.

While at it, rename `next_read_span_with_seekback` to
`next_seekback_span` to keep the naming consistent and to avoid making
function names any longer.
This commit is contained in:
Tim Schumacher 2023-06-02 00:01:15 +02:00 • committed by Linus Groh
parent d12036132e
commit 2109f61b0d
2 changed files with 29 additions and 11 deletions
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8
AK/CircularBuffer.h
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@ -51,7 +51,7 @@ protected:
[[nodiscard]] Bytes next_write_span();
[[nodiscard]] ReadonlyBytes next_read_span(size_t offset = 0) const;
[[nodiscard]] ReadonlyBytes next_read_span_with_seekback(size_t distance) const;
[[nodiscard]] ReadonlyBytes next_seekback_span(size_t distance) const;
ByteBuffer m_buffer {};
@ -65,6 +65,8 @@ public:
static ErrorOr<SearchableCircularBuffer> create_empty(size_t size);
static ErrorOr<SearchableCircularBuffer> create_initialized(ByteBuffer);
[[nodiscard]] size_t search_limit() const;
struct Match {
size_t distance;
size_t length;
@ -76,6 +78,10 @@ public:
ErrorOr<Vector<Match>> find_copy_in_seekback(Vector<size_t> const& distances, size_t maximum_length, size_t minimum_length = 2) const;
private:
// Note: This function has a similar purpose as next_seekback_span, but they differ in their reference point.
// Seekback operations start counting their distance at the write head, while search operations start counting their distance at the read head.
[[nodiscard]] ReadonlyBytes next_search_span(size_t distance) const;
SearchableCircularBuffer(ByteBuffer);
};