// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.

#include "chunkformats.h"
#include <vespa/vespalib/util/crc.h>
#include <vespa/vespalib/util/stringfmt.h>
#include <xxhash.h>

namespace search {

using vespalib::make_string;

ChunkFormatV1::ChunkFormatV1(vespalib::nbostream & is, uint32_t expectedCrc) :
    ChunkFormat()
{
    verifyCrc(is, expectedCrc);
    deserializeBody(is);
}

ChunkFormatV1::ChunkFormatV1(size_t maxSize) :
    ChunkFormat(maxSize)
{
}

uint32_t
ChunkFormatV1::computeCrc(const void * buf, size_t sz) const
{
    return vespalib::crc_32_type::crc(buf, sz);
}

ChunkFormatV2::ChunkFormatV2(vespalib::nbostream & is, uint32_t expectedCrc) :
    ChunkFormat()
{
    verifyCrc(is, expectedCrc);
    verifyMagic(is);
    deserializeBody(is);
}


ChunkFormatV2::ChunkFormatV2(size_t maxSize) :
    ChunkFormat(maxSize)
{
}

uint32_t
ChunkFormatV2::computeCrc(const void * buf, size_t sz) const
{
    return XXH32(buf, sz, 0);
}

void
ChunkFormatV2::verifyMagic(vespalib::nbostream & is) const
{
    uint32_t magic;
    is >> magic;
    if (magic != MAGIC) {
        throw ChunkException(make_string("Unknown magic %0x, expected %0x", magic, MAGIC), VESPA_STRLOC);
    }
}

} // namespace search