Add functions for encoding/decoding Prepare Write Request and
Response PDUs.
---
attrib/att.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
attrib/att.h | 5 +++++
2 files changed, 59 insertions(+)
diff --git a/attrib/att.c b/attrib/att.c
index 0550ac1..790ec3a 100644
--- a/attrib/att.c
+++ b/attrib/att.c
@@ -974,3 +974,57 @@ uint16_t dec_mtu_resp(const uint8_t *pdu, int len, uint16_t *mtu)
return min_len;
}
+
+uint16_t enc_prep_write_req(uint16_t handle, uint16_t offset,
+ const uint8_t *value, int vlen, uint8_t *pdu, int len)
+{
+ const uint16_t min_len = sizeof(pdu[0]) + sizeof(handle) +
+ sizeof(offset);
+
+ if (pdu == NULL)
+ return 0;
+
+ if (len < min_len)
+ return 0;
+
+ if (vlen > len - min_len)
+ vlen = len - min_len;
+
+ pdu[0] = ATT_OP_PREP_WRITE_REQ;
+ att_put_u16(handle, &pdu[1]);
+ att_put_u16(offset, &pdu[3]);
+
+ if (vlen > 0) {
+ memcpy(&pdu[5], value, vlen);
+ return min_len + vlen;
+ }
+
+ return min_len;
+}
+
+uint16_t dec_prep_write_resp(const uint8_t *pdu, int len, uint16_t *handle,
+ uint16_t *offset, uint8_t *value, int *vlen)
+{
+ const uint16_t min_len = sizeof(pdu[0]) + sizeof(*handle) +
+ sizeof(*offset);
+
+ if (pdu == NULL)
+ return 0;
+
+ if (handle == NULL || offset == NULL || value == NULL || vlen == NULL)
+ return 0;
+
+ if (len < min_len)
+ return 0;
+
+ if (pdu[0] != ATT_OP_PREP_WRITE_REQ)
+ return 0;
+
+ *handle = att_get_u16(&pdu[1]);
+ *offset = att_get_u16(&pdu[3]);
+ *vlen = len - min_len;
+ if (*vlen > 0)
+ memcpy(value, pdu + min_len, *vlen);
+
+ return len;
+}
diff --git a/attrib/att.h b/attrib/att.h
index 1c1102a..ec03be9 100644
--- a/attrib/att.h
+++ b/attrib/att.h
@@ -256,3 +256,8 @@ uint16_t enc_mtu_req(uint16_t mtu, uint8_t *pdu, int len);
uint16_t dec_mtu_req(const uint8_t *pdu, int len, uint16_t *mtu);
uint16_t enc_mtu_resp(uint16_t mtu, uint8_t *pdu, int len);
uint16_t dec_mtu_resp(const uint8_t *pdu, int len, uint16_t *mtu);
+
+uint16_t enc_prep_write_req(uint16_t handle, uint16_t offset,
+ const uint8_t *value, int vlen, uint8_t *pdu, int len);
+uint16_t dec_prep_write_resp(const uint8_t *pdu, int len, uint16_t *handle,
+ uint16_t *offset, uint8_t *value, int *vlen);
--
1.7.9.5
--
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