Changeset: a13846692aaa for MonetDB
URL: https://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=a13846692aaa
Modified Files:
gdk/gdk_strimps.c
Branch: string_imprints
Log Message:
Some utility functions
- lookup the index of a pair in the header
- construct a bitstring for a given string encoding the presence or
absence of the pairs in the header
These should probably be inlined.
diffs (68 lines):
diff --git a/gdk/gdk_strimps.c b/gdk/gdk_strimps.c
--- a/gdk/gdk_strimps.c
+++ b/gdk/gdk_strimps.c
@@ -227,33 +227,43 @@ create_header(BAT *b)
}
-/* static uint8_t */
-/* lookup_index(StrimpHeader *h, uint16_t n) */
-/* { */
-/* size_t i; */
-/* for(i = 0; i < STRIMP_SIZE; i++) */
-/* if(h->bytepairs[i] == n) */
-/* return i; */
+/* Given a strimp h and a DataPair p, return the index i for which
+ *
+ * h[i] == p
+ *
+ * Returns 0 if p is not in h.
+ *
+ * TODO: Should this be inlined somehow? (probably yes)
+ */
+static uint8_t
+lookup_index(StrimpHeader *h, DataPair n)
+{
+ size_t i;
+ for(i = 0; i < STRIMP_HEADER_SIZE; i++)
+ if(h->bytepairs[i] == n)
+ return i;
-/* return 0; */
-/* } */
+ return 0;
+}
/* Given a strimp header and a string compute the bitstring of which
* digrams(byte pairs) are present in the string. The strimp header is a
* map from digram(byte pair) to index in the strimp.
+ *
+ * This should probably be inlined.
*/
-/* static uint64_t */
-/* GDKstrimp_make_bitstring(str s, StrimpHeader *h) */
-/* { */
-/* uint64_t ret = 0; */
-/* uint8_t pair_idx; */
-/* char *it; */
+static uint64_t
+GDKstrimp_make_bitstring(const str s, StrimpHeader *h)
+{
+ uint64_t ret = 0;
+ uint8_t pair_idx;
+ char *it;
-/* for(it = s; *it != 0 && *(it+1) != 0; it++) { */
-/* pair_idx = lookup_index(h, pairToIndex(*it, *(it+1))); */
-/* ret |= 0x1 << pair_idx; */
-/* } */
+ for(it = s; *it != 0 && *(it+1) != 0; it++) {
+ pair_idx = lookup_index(h, pairToIndex(*it, *(it+1)));
+ ret |= 0x1 << pair_idx;
+ }
-/* return ret; */
-/* } */
+ return ret;
+}
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