// write Content payload *before* buf[offs], adjust offs and return bytes used
int
ccnl_ccntlv_prependContent(struct ccnl_prefix_s *name,
unsigned char *payload, int paylen,
unsigned int *lastchunknum, int *contentpos,
int *offset, unsigned char *buf)
{
int tloffset = *offset;
if (contentpos)
*contentpos = *offset - paylen;
// fill in backwards
if (ccnl_ccntlv_prependBlob(CCNX_TLV_M_Payload, payload, paylen,
offset, buf) < 0)
return -1;
if (ccnl_ccntlv_prependName(name, offset, buf, lastchunknum))
return -1;
if (ccnl_ccntlv_prependTL(CCNX_TLV_TL_Object,
tloffset - *offset, offset, buf) < 0)
return -1;
return tloffset - *offset;
}
// write Content payload *before* buf[offs], adjust offs and return bytes used
int8_t
ccnl_ccntlv_prependContent(struct ccnl_prefix_s *name,
uint8_t *payload, size_t paylen,
uint32_t *lastchunknum, size_t *contentpos,
size_t *offset, uint8_t *buf, size_t *reslen)
{
size_t tloffset = *offset;
if (contentpos) {
*contentpos = *offset - paylen;
}
// fill in backwards
if (ccnl_ccntlv_prependBlob(CCNX_TLV_M_Payload, payload, paylen, offset, buf)) {
return -1;
}
if (ccnl_ccntlv_prependName(name, offset, buf, lastchunknum)) {
return -1;
}
if (ccnl_ccntlv_prependTL(CCNX_TLV_TL_Object, tloffset - *offset, offset, buf)) {
return -1;
}
*reslen = tloffset - *offset;
return 0;
}
// write len bytes *before* position buf[offset], adjust offset
int
ccnl_ccntlv_prependBlob(unsigned short type, unsigned char *blob,
unsigned short len, int *offset, unsigned char *buf)
{
if (*offset < (len + 4))
return -1;
*offset -= len;
memcpy(buf + *offset, blob, len);
if (ccnl_ccntlv_prependTL(type, len, offset, buf) < 0)
return -1;
return len + 4;
}
// write Interest payload *before* buf[offs], adjust offs and return bytes used
int
ccnl_ccntlv_prependInterest(struct ccnl_prefix_s *name,
int *offset, unsigned char *buf)
{
int oldoffset = *offset;
if (ccnl_ccntlv_prependName(name, offset, buf, NULL))
return -1;
if (ccnl_ccntlv_prependTL(CCNX_TLV_TL_Interest,
oldoffset - *offset, offset, buf) < 0)
return -1;
return oldoffset - *offset;
}
// write len bytes *before* position buf[offset], adjust offset
int8_t
ccnl_ccntlv_prependBlob(uint16_t type, uint8_t *blob,
size_t len, size_t *offset, uint8_t *buf)
{
if (*offset < (len + 4)) {
return -1;
}
*offset -= len;
memcpy(buf + *offset, blob, len);
if (ccnl_ccntlv_prependTL(type, len, offset, buf)) {
return -1;
}
return 0;
}
// write Interest payload *before* buf[offs], adjust offs and return bytes used
int8_t
ccnl_ccntlv_prependInterest(struct ccnl_prefix_s *name,
size_t *offset, uint8_t *buf, size_t *len)
{
size_t oldoffset = *offset;
if (ccnl_ccntlv_prependName(name, offset, buf, NULL)) {
return -1;
}
if (ccnl_ccntlv_prependTL(CCNX_TLV_TL_Interest,
oldoffset - *offset, offset, buf)) {
return -1;
}
*len = oldoffset - *offset;
return 0;
}
// write given prefix and chunknum *before* buf[offs], adjust offset
// and return bytes used
int
ccnl_ccntlv_prependName(struct ccnl_prefix_s *name,
int *offset, unsigned char *buf,
unsigned int *lastchunknum) {
int nameend, cnt;
if (lastchunknum) {
if (ccnl_ccntlv_prependNetworkVarUInt(CCNX_TLV_M_ENDChunk,
*lastchunknum, offset, buf) < 0)
return -1;
}
nameend = *offset;
if (name->chunknum &&
ccnl_ccntlv_prependNetworkVarUInt(CCNX_TLV_N_Chunk,
*name->chunknum, offset, buf) < 0)
return -1;
// optional: (not used)
// CCNX_TLV_N_Meta
#ifdef USE_NFN
if (name->nfnflags & CCNL_PREFIX_NFN)
if (ccnl_pkt_prependComponent(name->suite, "NFN", offset, buf) < 0)
return -1;
if (name->nfnflags & CCNL_PREFIX_THUNK)
if (ccnl_pkt_prependComponent(name->suite, "THUNK", offset, buf) < 0)
return -1;
#endif
for (cnt = name->compcnt - 1; cnt >= 0; cnt--) {
if (*offset < name->complen[cnt])
return -1;
*offset -= name->complen[cnt];
memcpy(buf + *offset, name->comp[cnt], name->complen[cnt]);
}
if (ccnl_ccntlv_prependTL(CCNX_TLV_M_Name, nameend - *offset,
offset, buf) < 0)
return -1;
return 0;
}
// write (in network order and with the minimal number of bytes)
// the given unsigned integer val *before* position buf[offset], adjust offset
// and return number of bytes prepended. 0 is represented as %x00
int
ccnl_ccntlv_prependNetworkVarUInt(unsigned short type, unsigned int intval,
int *offset, unsigned char *buf)
{
int offs = *offset;
int len = 0;
while (offs > 0) {
buf[--offs] = intval & 0xff;
len++;
intval = intval >> 8;
if (!intval)
break;
}
*offset = offs;
if (ccnl_ccntlv_prependTL(type, len, offset, buf) < 0)
return -1;
return len + 4;
}
// write given prefix and chunknum *before* buf[offs], adjust offset.
// Returns 0 on success, non-zero on failure.
int8_t
ccnl_ccntlv_prependName(struct ccnl_prefix_s *name,
size_t *offset, uint8_t *buf,
const uint32_t *lastchunknum) {
size_t cnt;
size_t nameend;
if (lastchunknum) {
if (ccnl_ccntlv_prependNetworkVarUInt(CCNX_TLV_M_ENDChunk,
*lastchunknum, offset, buf)) {
return -1;
}
}
nameend = *offset;
if (name->chunknum &&
ccnl_ccntlv_prependNetworkVarUInt(CCNX_TLV_N_Chunk,
*name->chunknum, offset, buf)) {
return -1;
}
// optional: (not used)
// CCNX_TLV_N_Meta
for (cnt = name->compcnt; cnt > 0; cnt--) {
if (*offset < name->complen[cnt-1]) {
return -1;
}
*offset -= name->complen[cnt-1];
memcpy(buf + *offset, name->comp[cnt-1], name->complen[cnt-1]);
}
if (ccnl_ccntlv_prependTL(CCNX_TLV_M_Name, nameend - *offset,
offset, buf)) {
return -1;
}
return 0;
}
// write (in network order and with the minimal number of bytes)
// the given unsigned integer val *before* position buf[offset], adjust offset
// and return number of bytes prepended. 0 is represented as %x00
int8_t
ccnl_ccntlv_prependNetworkVarUInt(uint16_t type, uint32_t intval,
size_t *offset, uint8_t *buf)
{
size_t offs = *offset;
size_t len = 0;
while (offs > 0) {
buf[--offs] = (uint8_t) (intval & 0xffU);
len++;
intval = intval >> 8U;
if (!intval) {
break;
}
}
*offset = offs;
if (ccnl_ccntlv_prependTL(type, len, offset, buf)) {
return -1;
}
return 0;
}
