adler32.c

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// SPDX-FileCopyrightText: 2021 deroad <wargio@libero.it>
// SPDX-License-Identifier: LGPL-3.0-only
 
#include "adler32.h"
#include <rz_util.h>
 
bool rz_adler32_init(RzAdler32 *ctx) {
    rz_return_val_if_fail(ctx, false);
    ctx->low = 1;
    ctx->high = 0;
    return true;
}
 
bool rz_adler32_update(RzAdler32 *ctx, const ut8 *data, size_t len) {
    rz_return_val_if_fail(ctx && data, false);
    for (size_t index = 0; index < len; index++) {
        ctx->low = (ctx->low + data[index]) % 65521;
        ctx->high = (ctx->high + ctx->low) % 65521;
    }
    return true;
}
 
bool rz_adler32_final(ut8 *digest, RzAdler32 *ctx) {
    rz_return_val_if_fail(digest && ctx, false);
    rz_write_le32(digest, ctx->high << 16 | ctx->low);
    return true;
}