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authorNicolai Stange <nicstange@gmail.com>2016-05-26 23:19:55 +0200
committerHerbert Xu <herbert@gondor.apana.org.au>2016-05-31 16:42:01 +0800
commit20b5b7f3c2df2fb69b3b27dc83314b8891614ba5 (patch)
tree48df6ac9ff7c440bc8c26646dbc225e363ed6adf
parentcdf24b42c6740ec429e85a8405e5e917abac8595 (diff)
lib/mpi: refactor mpi_read_from_buffer() in terms of mpi_read_raw_data()
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>
-rw-r--r--lib/mpi/mpicoder.c24
1 files changed, 3 insertions, 21 deletions
diff --git a/lib/mpi/mpicoder.c b/lib/mpi/mpicoder.c
index f4f9e3396f3e..823cf5f5196b 100644
--- a/lib/mpi/mpicoder.c
+++ b/lib/mpi/mpicoder.c
@@ -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;