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shared: add nm_utils_checksum_get_digest*() helper

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The GChecksum API is cumbersome to use.

For example, g_checksum_get_digest() requires a length input/output
argument. At the same time, GChecksum does not allow you to query its
checksum-type nor the desired digest-length. When you have a GChecksum
at hand, you must always know the digest-length you are going to use.
So, the length parameter is only good for asserting.

Add a macro to make that more convenient.

Benefits: it's less lines of code, and we always do all the asserts
that are due.
This commit is contained in:
Thomas Haller 2018-11-01 11:37:57 +01:00
parent 80220024cc
commit 3746845204
1 changed files with 40 additions and 0 deletions
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40
shared/nm-utils/nm-shared-utils.h
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@ -380,6 +380,46 @@ char **_nm_utils_strv_cleanup (char **strv,
/*****************************************************************************/
#define NM_UTILS_CHECKSUM_LENGTH_MD5 16
#define NM_UTILS_CHECKSUM_LENGTH_SHA1 20
#define NM_UTILS_CHECKSUM_LENGTH_SHA256 32
#define nm_utils_checksum_get_digest(sum, arr) \
G_STMT_START { \
GChecksum *const _sum = (sum); \
gsize _len; \
\
G_STATIC_ASSERT_EXPR ( sizeof (arr) == NM_UTILS_CHECKSUM_LENGTH_MD5 \
|| sizeof (arr) == NM_UTILS_CHECKSUM_LENGTH_SHA1 \
|| sizeof (arr) == NM_UTILS_CHECKSUM_LENGTH_SHA256); \
G_STATIC_ASSERT_EXPR (sizeof (arr) == G_N_ELEMENTS (arr)); \
\
nm_assert (_sum); \
\
_len = G_N_ELEMENTS (arr); \
\
g_checksum_get_digest (_sum, (arr), &_len); \
nm_assert (_len == G_N_ELEMENTS (arr)); \
} G_STMT_END
#define nm_utils_checksum_get_digest_len(sum, buf, len) \
G_STMT_START { \
GChecksum *const _sum = (sum); \
const gsize _len0 = (len); \
gsize _len; \
\
nm_assert (NM_IN_SET (_len0, NM_UTILS_CHECKSUM_LENGTH_MD5, \
NM_UTILS_CHECKSUM_LENGTH_SHA1, \
NM_UTILS_CHECKSUM_LENGTH_SHA256)); \
nm_assert (_sum); \
\
_len = _len0; \
g_checksum_get_digest (_sum, (buf), &_len); \
nm_assert (_len == _len0); \
} G_STMT_END
/*****************************************************************************/
guint32 _nm_utils_ip4_prefix_to_netmask (guint32 prefix);
guint32 _nm_utils_ip4_get_default_prefix (guint32 ip);