[PATCH] libosmocore[master]: bitvec: implement write L or H value to vector

[Minh-Quang Nguyen]

Review at  https://gerrit.osmocom.org/3990

bitvec: implement write L or H value to vector

Change-Id: I36a76916a5986f098b6be6b5b779639c470725ef
---
M include/osmocom/core/bitvec.h
M src/bitvec.c
2 files changed, 25 insertions(+), 0 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/90/3990/1

diff --git a/include/osmocom/core/bitvec.h b/include/osmocom/core/bitvec.h
index d4c7d68..944b391 100644
--- a/include/osmocom/core/bitvec.h
+++ b/include/osmocom/core/bitvec.h
@@ -70,6 +70,7 @@
 unsigned int bitvec_unpack(struct bitvec *bv, const uint8_t *buffer);
 uint64_t bitvec_read_field(struct bitvec *bv, unsigned int *read_index, unsigned int len);
 int bitvec_write_field(struct bitvec *bv, unsigned int *write_index, uint64_t val, unsigned int len);
+int bitvec_write_field_lh(struct bitvec *bv, unsigned int *write_index, uint64_t val, unsigned int len);
 int bitvec_fill(struct bitvec *bv, unsigned int num_bits, enum bit_value fill);
 char bit_value_to_char(enum bit_value v);
 void bitvec_to_string_r(const struct bitvec *bv, char *str);
diff --git a/src/bitvec.c b/src/bitvec.c
index f07b42c..a294675 100644
--- a/src/bitvec.c
+++ b/src/bitvec.c
@@ -503,6 +503,30 @@
 	return 0;
 }
 
+/*! write L/H value into the vector
+ *  \param[in] bv The boolean vector to work on
+ *  \param[in,out] write_index Where writing supposed to start in the vector
+ *  \param[in] L or H value to be written to the vector
+ *  \param[in] len How many bits to write
+ *  \returns 0 in case of success or negative value on error
+ */
+int bitvec_write_field_lh(struct bitvec *bv, unsigned int *write_index, uint64_t val, unsigned int len)
+{
+	unsigned int i;
+	int rc;
+	bv->cur_bit = *write_index;
+	for (i = 0; i < len; i++) {
+		int bit = L;
+		if (val & ((uint64_t)1 << (len - i - 1)))
+			bit = H;
+		rc = bitvec_set_bit(bv, bit);
+		if (rc)
+			return rc;
+	}
+	*write_index += len;
+	return 0;
+}
+
 /*! convert enum to corresponding character
  *  \param v input value (bit)
  *  \return single character, either 0, 1, L or H */

-- 
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I36a76916a5986f098b6be6b5b779639c470725ef
Gerrit-PatchSet: 1
Gerrit-Project: libosmocore
Gerrit-Branch: master
Gerrit-Owner: Minh-Quang Nguyen <minh-quang.nguyen at nutaq.com>