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lib/mpi: refactor mpi_read_from_buffer() in terms of mpi_read_raw_data()

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mpi_read_from_buffer() and mpi_read_raw_data() do basically the same thing
except that the former extracts the number of payload bits from the first
two bytes of the input buffer.

Besides that, the data copying logic is exactly the same.

Replace the open coded buffer to MPI instance conversion by a call to
mpi_read_raw_data().

Signed-off-by: Nicolai Stange <nicstange@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Nicolai Stange 2016-05-26 23:19:55 +02:00 committed by Herbert Xu
parent cdf24b42c6
commit 20b5b7f3c2
1 changed files with 3 additions and 21 deletions
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24
lib/mpi/mpicoder.c
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@ -80,10 +80,8 @@ EXPORT_SYMBOL_GPL(mpi_read_raw_data);
MPI mpi_read_from_buffer(const void *xbuffer, unsigned *ret_nread)
{
const uint8_t *buffer = xbuffer;
int i, j;
unsigned nbits, nbytes, nlimbs;
mpi_limb_t a;
MPI val = NULL;
unsigned int nbits, nbytes;
MPI val;
if (*ret_nread < 2)
return ERR_PTR(-EINVAL);
@ -93,7 +91,6 @@ MPI mpi_read_from_buffer(const void *xbuffer, unsigned *ret_nread)
pr_info("MPI: mpi too large (%u bits)\n", nbits);
return ERR_PTR(-EINVAL);
}
buffer += 2;
nbytes = DIV_ROUND_UP(nbits, 8);
if (nbytes + 2 > *ret_nread) {
@ -102,24 +99,9 @@ MPI mpi_read_from_buffer(const void *xbuffer, unsigned *ret_nread)
return ERR_PTR(-EINVAL);
}
nlimbs = DIV_ROUND_UP(nbytes, BYTES_PER_MPI_LIMB);
val = mpi_alloc(nlimbs);
val = mpi_read_raw_data(buffer + 2, nbytes);
if (!val)
return ERR_PTR(-ENOMEM);
i = BYTES_PER_MPI_LIMB - nbytes % BYTES_PER_MPI_LIMB;
i %= BYTES_PER_MPI_LIMB;
val->nbits = nbits;
j = val->nlimbs = nlimbs;
val->sign = 0;
for (; j > 0; j--) {
a = 0;
for (; i < BYTES_PER_MPI_LIMB; i++) {
a <<= 8;
a |= *buffer++;
}
i = 0;
val->d[j - 1] = a;
}
*ret_nread = nbytes + 2;
return val;