//-----------------------------------------------------------------------------
// The original MurmurHash2 was written by Austin Appleby, and is placed in the
// public domain. The author hereby disclaims copyright to this source code.
//
// This was modified as to possibilitate it's usage incrementally.
// Those modifications are also placed in the public domain, and the author of
// such modifications hereby disclaims copyright to this source code.

#pragma once

#include <cstdint>
#include <functional>

namespace Murmur2 {

#define KiB 1024
#define MiB 1024 * KiB

class Reader {
   public:
    virtual ~Reader() = default;
    virtual int read(char* s, int n) = 0;
    virtual bool eof() = 0;
    virtual void goToBeginning() = 0;
};

uint32_t hash(
    Reader* file_stream,
    std::size_t buffer_size = 4 * MiB,
    std::function<bool(char)> filter_out = [](char) { return false; });

struct IncrementalHashInfo {
    uint32_t h;
    uint32_t len;
};

void FourBytes_MurmurHash2(const unsigned char* data, IncrementalHashInfo& prev);
}  // namespace Murmur2