// write Content packet *before* buf[offs], adjust offs and return bytes used
int
ccnl_ccntlv_prependContentWithHdr(struct ccnl_prefix_s *name,
unsigned char *payload, int paylen,
unsigned int *lastchunknum, int *contentpos,
int *offset, unsigned char *buf)
{
int len, oldoffset;
unsigned char hoplimit = 255; // setting to max (content has no hoplimit)
oldoffset = *offset;
len = ccnl_ccntlv_prependContent(name, payload, paylen, lastchunknum,
contentpos, offset, buf);
if (len < 0)
return -1;
if ((unsigned int)len >= ((uint32_t)1 << 16) - sizeof(struct ccnx_tlvhdr_ccnx2015_s))
return -1;
if (ccnl_ccntlv_prependFixedHdr(CCNX_TLV_V1, CCNX_PT_Data,
len, hoplimit, offset, buf) < 0)
return -1;
return oldoffset - *offset;
}
// write Content packet *before* buf[offs], adjust offs and return bytes used
int8_t
ccnl_ccntlv_prependContentWithHdr(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 len, oldoffset;
uint8_t hoplimit = 255; // setting to max (content has no hoplimit)
oldoffset = *offset;
if (ccnl_ccntlv_prependContent(name, payload, paylen, lastchunknum,
contentpos, offset, buf, &len)) {
return -1;
}
if (len > (UINT16_MAX - sizeof(struct ccnx_tlvhdr_ccnx2015_s))) {
return -1;
}
if (ccnl_ccntlv_prependFixedHdr(CCNX_TLV_V1, CCNX_PT_Data,
len, hoplimit, offset, buf)) {
return -1;
}
*reslen = oldoffset - *offset;
return 0;
}