mirror of https://gerrit.osmocom.org/libosmocore
245 lines
5.4 KiB
C
245 lines
5.4 KiB
C
#ifndef _TLV_H
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#define _TLV_H
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#include <stdint.h>
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#include <string.h>
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#include <osmocore/msgb.h>
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/* Terminology / wording
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tag length value (in bits)
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V - - 8
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LV - 8 N * 8
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TLV 8 8 N * 8
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TL16V 8 16 N * 8
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TLV16 8 8 N * 16
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TvLV 8 8/16 N * 8
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*/
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#define LV_GROSS_LEN(x) (x+1)
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#define TLV_GROSS_LEN(x) (x+2)
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#define TLV16_GROSS_LEN(x) ((2*x)+2)
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#define TL16V_GROSS_LEN(x) (x+3)
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#define L16TV_GROSS_LEN(x) (x+3)
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#define TVLV_MAX_ONEBYTE 0x7f
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static inline uint16_t TVLV_GROSS_LEN(uint16_t len)
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{
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if (len <= TVLV_MAX_ONEBYTE)
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return TLV_GROSS_LEN(len);
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else
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return TL16V_GROSS_LEN(len);
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}
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/* TLV generation */
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static inline uint8_t *lv_put(uint8_t *buf, uint8_t len,
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const uint8_t *val)
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{
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*buf++ = len;
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memcpy(buf, val, len);
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return buf + len;
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}
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static inline uint8_t *tlv_put(uint8_t *buf, uint8_t tag, uint8_t len,
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const uint8_t *val)
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{
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*buf++ = tag;
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*buf++ = len;
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memcpy(buf, val, len);
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return buf + len;
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}
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static inline uint8_t *tlv16_put(uint8_t *buf, uint8_t tag, uint8_t len,
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const uint16_t *val)
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{
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*buf++ = tag;
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*buf++ = len;
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memcpy(buf, val, len*2);
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return buf + len*2;
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}
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static inline uint8_t *tl16v_put(uint8_t *buf, uint8_t tag, uint16_t len,
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const uint8_t *val)
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{
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*buf++ = tag;
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*buf++ = len >> 8;
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*buf++ = len & 0xff;
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memcpy(buf, val, len);
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return buf + len*2;
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}
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static inline uint8_t *tvlv_put(uint8_t *buf, uint8_t tag, uint16_t len,
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const uint8_t *val)
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{
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uint8_t *ret;
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if (len <= TVLV_MAX_ONEBYTE) {
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ret = tlv_put(buf, tag, len, val);
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buf[1] |= 0x80;
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} else
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ret = tl16v_put(buf, tag, len, val);
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return ret;
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}
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static inline uint8_t *msgb_tlv16_put(struct msgb *msg, uint8_t tag, uint8_t len, const uint16_t *val)
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{
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uint8_t *buf = msgb_put(msg, TLV16_GROSS_LEN(len));
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return tlv16_put(buf, tag, len, val);
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}
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static inline uint8_t *msgb_tl16v_put(struct msgb *msg, uint8_t tag, uint16_t len,
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const uint8_t *val)
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{
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uint8_t *buf = msgb_put(msg, TL16V_GROSS_LEN(len));
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return tl16v_put(buf, tag, len, val);
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}
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static inline uint8_t *msgb_tvlv_put(struct msgb *msg, uint8_t tag, uint16_t len,
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const uint8_t *val)
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{
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uint8_t *buf = msgb_put(msg, TVLV_GROSS_LEN(len));
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return tvlv_put(buf, tag, len, val);
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}
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static inline uint8_t *msgb_l16tv_put(struct msgb *msg, uint16_t len, uint8_t tag,
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const uint8_t *val)
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{
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uint8_t *buf = msgb_put(msg, L16TV_GROSS_LEN(len));
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*buf++ = len >> 8;
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*buf++ = len & 0xff;
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*buf++ = tag;
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memcpy(buf, val, len);
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return buf + len;
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}
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static inline uint8_t *v_put(uint8_t *buf, uint8_t val)
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{
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*buf++ = val;
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return buf;
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}
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static inline uint8_t *tv_put(uint8_t *buf, uint8_t tag,
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uint8_t val)
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{
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*buf++ = tag;
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*buf++ = val;
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return buf;
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}
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/* 'val' is still in host byte order! */
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static inline uint8_t *tv16_put(uint8_t *buf, uint8_t tag,
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uint16_t val)
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{
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*buf++ = tag;
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*buf++ = val >> 8;
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*buf++ = val & 0xff;
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return buf;
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}
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static inline uint8_t *msgb_lv_put(struct msgb *msg, uint8_t len, const uint8_t *val)
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{
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uint8_t *buf = msgb_put(msg, LV_GROSS_LEN(len));
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return lv_put(buf, len, val);
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}
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static inline uint8_t *msgb_tlv_put(struct msgb *msg, uint8_t tag, uint8_t len, const uint8_t *val)
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{
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uint8_t *buf = msgb_put(msg, TLV_GROSS_LEN(len));
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return tlv_put(buf, tag, len, val);
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}
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static inline uint8_t *msgb_tv_put(struct msgb *msg, uint8_t tag, uint8_t val)
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{
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uint8_t *buf = msgb_put(msg, 2);
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return tv_put(buf, tag, val);
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}
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static inline uint8_t *msgb_v_put(struct msgb *msg, uint8_t val)
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{
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uint8_t *buf = msgb_put(msg, 1);
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return v_put(buf, val);
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}
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static inline uint8_t *msgb_tv16_put(struct msgb *msg, uint8_t tag, uint16_t val)
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{
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uint8_t *buf = msgb_put(msg, 3);
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return tv16_put(buf, tag, val);
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}
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static inline uint8_t *msgb_tlv_push(struct msgb *msg, uint8_t tag, uint8_t len, const uint8_t *val)
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{
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uint8_t *buf = msgb_push(msg, TLV_GROSS_LEN(len));
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return tlv_put(buf, tag, len, val);
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}
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static inline uint8_t *msgb_tv_push(struct msgb *msg, uint8_t tag, uint8_t val)
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{
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uint8_t *buf = msgb_push(msg, 2);
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return tv_put(buf, tag, val);
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}
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static inline uint8_t *msgb_tv16_push(struct msgb *msg, uint8_t tag, uint16_t val)
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{
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uint8_t *buf = msgb_push(msg, 3);
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return tv16_put(buf, tag, val);
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}
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static inline uint8_t *msgb_tvlv_push(struct msgb *msg, uint8_t tag, uint16_t len,
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const uint8_t *val)
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{
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uint8_t *buf = msgb_push(msg, TVLV_GROSS_LEN(len));
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return tvlv_put(buf, tag, len, val);
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}
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/* TLV parsing */
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struct tlv_p_entry {
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uint16_t len;
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const uint8_t *val;
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};
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enum tlv_type {
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TLV_TYPE_NONE,
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TLV_TYPE_FIXED,
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TLV_TYPE_T,
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TLV_TYPE_TV,
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TLV_TYPE_TLV,
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TLV_TYPE_TL16V,
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TLV_TYPE_TvLV,
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};
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struct tlv_def {
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enum tlv_type type;
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uint8_t fixed_len;
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};
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struct tlv_definition {
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struct tlv_def def[0xff];
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};
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struct tlv_parsed {
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struct tlv_p_entry lv[0xff];
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};
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extern struct tlv_definition tvlv_att_def;
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int tlv_parse_one(uint8_t *o_tag, uint16_t *o_len, const uint8_t **o_val,
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const struct tlv_definition *def,
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const uint8_t *buf, int buf_len);
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int tlv_parse(struct tlv_parsed *dec, const struct tlv_definition *def,
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const uint8_t *buf, int buf_len, uint8_t lv_tag, uint8_t lv_tag2);
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/* take a master (src) tlvdev and fill up all empty slots in 'dst' */
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void tlv_def_patch(struct tlv_definition *dst, const struct tlv_definition *src);
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#define TLVP_PRESENT(x, y) ((x)->lv[y].val)
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#define TLVP_LEN(x, y) (x)->lv[y].len
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#define TLVP_VAL(x, y) (x)->lv[y].val
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#endif /* _TLV_H */
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