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/* See LICENSE file for copyright and license details. */
#include "../common.h"
#if defined(__clang__)
# pragma clang diagnostic ignored "-Wcast-align"
#endif
/**
* Unmarshal a `struct libkeccak_state` from a buffer
*
* @param state The slot for the unmarshalled state, must not be
* initialised (memory leak otherwise), can be `NULL`
* @param data_ The input buffer
* @return The number of bytes read from `data`, 0 on error
*/
size_t
libkeccak_state_unmarshal(struct libkeccak_state *restrict state, const void *restrict data_)
{
#define get(VAR) \
do {\
__builtin_memcpy(&state->VAR, data, sizeof(state->VAR));\
data += sizeof(state->VAR);\
} while (0)
const unsigned char *restrict start = data_;
const unsigned char *restrict data = start;
size_t mptr;
if (!state) {
data += 7U * sizeof(long int);
data += 1U * sizeof(int64_t);
data += sizeof(state->S);
mptr = *(const size_t *)data;
data += 2U * sizeof(size_t);
data += mptr;
return (size_t)(data - start);
}
get(r);
get(c);
get(n);
get(b);
get(w);
get(wmod);
get(l);
get(nr);
memcpy(state->S, data, sizeof(state->S));
data += sizeof(state->S);
get(mptr);
get(mlen);
if (state->mptr) {
state->M = malloc(state->mptr * sizeof(char));
if (!state->M)
return 0;
memcpy(state->M, data, state->mptr * sizeof(char));
data += state->mptr;
} else {
state->M = NULL;
}
return (size_t)(data - start);
#undef get
}
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