Adler32.cpp

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#include <sourcepp/crypto/Adler32.h>
 
#include <BufferStream.h>
#include <tomcrypt.h>
 
#include <sourcepp/crypto/Globals.h>
 
using namespace sourcepp;
 
uint32_t crypto::computeAdler32(std::span<const std::byte> buffer) {
    if (!LTM_MATH || buffer.empty()) {
        return 0;
    }
 
    adler32_state adler32{};
    // do NOT call init! must start zeroed, init changes this (necessary for GCF)
    adler32_update(&adler32, reinterpret_cast<const unsigned char*>(buffer.data()), buffer.size());
 
    uint32_t final;
    adler32_finish(&adler32, &final, sizeof(final));
    BufferStream::swap_endian(&final);
    return final;
}