zstd.c

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/*
 * This file is part of the Aaru Data Preservation Suite.
 * Copyright (c) 2019-2026 Natalia Portillo.
 *
 * This library is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of the
 * License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 */
 
#include <stddef.h>
#include <stdint.h>
 
#include <aaruformat.h>
#include <zstd.h>

AARU_EXPORT size_t AARU_CALL aaruf_zstd_decode_buffer(uint8_t *dst_buffer, size_t dst_size, const uint8_t *src_buffer,
                                                       size_t src_size)
{
    size_t result = ZSTD_decompress(dst_buffer, dst_size, src_buffer, src_size);
 
    if(ZSTD_isError(result)) return 0;
 
    return result;
}

AARU_EXPORT size_t AARU_CALL aaruf_zstd_encode_buffer(uint8_t *dst_buffer, size_t dst_size, const uint8_t *src_buffer,
                                                       size_t src_size, int level, int num_threads)
{
    ZSTD_CCtx *cctx = ZSTD_createCCtx();
    if(cctx == NULL) return 0;
 
    ZSTD_CCtx_setParameter(cctx, ZSTD_c_compressionLevel, level);
 
    if(num_threads > 1) ZSTD_CCtx_setParameter(cctx, ZSTD_c_nbWorkers, num_threads);
 
    size_t result = ZSTD_compress2(cctx, dst_buffer, dst_size, src_buffer, src_size);
 
    ZSTD_freeCCtx(cctx);
 
    if(ZSTD_isError(result)) return 0;
 
    return result;
}