/**
* Internal function get the total length of primary block to write on the buffer
*
* @param bundle Bundle to generate
* @param dict Dictionary to get the offsets of the endpoint eids
* @param primary PrimaryBlock data strucre object
* @return Total numbers of Bytes required to write primary block
*/
protected static int get_primary_len(final Bundle bundle, Dictionary dict, PrimaryBlock primary) {
int primary_len = 0;
int block_len = 0;
primary.set_dictionary_length(0);
primary.set_block_length(0);
/*
* We need to figure out the total length of the primary block,
* except for the SDNVs used to encode flags and the length itself and
* the one byte version field.
*
* First, we determine the size of the dictionary by first
* figuring out all the unique strings, and in the process,
* remembering their offsets and summing up their lengths
* (including the null terminator for each).
*/
dict.get_offsets(bundle.dest(), primary.dest_scheme_offset(), primary.dest_ssp_offset());
block_len += SDNV.encoding_len(primary.dest_scheme_offset());
block_len += SDNV.encoding_len(primary.dest_ssp_offset());
dict.get_offsets(bundle.source(), primary.source_scheme_offset(), primary.source_ssp_offset());
block_len += SDNV.encoding_len(primary.source_scheme_offset());
block_len += SDNV.encoding_len(primary.source_ssp_offset());
dict.get_offsets(
bundle.replyto(), primary.replyto_scheme_offset(), primary.replyto_ssp_offset());
block_len += SDNV.encoding_len(primary.replyto_scheme_offset());
block_len += SDNV.encoding_len(primary.replyto_ssp_offset());
dict.get_offsets(
bundle.custodian(), primary.custodian_scheme_offset(), primary.custodian_ssp_offset());
block_len += SDNV.encoding_len(primary.custodian_scheme_offset());
block_len += SDNV.encoding_len(primary.custodian_ssp_offset());
primary.set_dictionary_length(dict.dict_length());
block_len += SDNV.encoding_len(bundle.creation_ts().seconds());
block_len += SDNV.encoding_len(bundle.creation_ts().seqno());
block_len += SDNV.encoding_len(bundle.expiration());
block_len += SDNV.encoding_len(primary.dictionary_length_value());
block_len += primary.dictionary_length_value();
/*
* If the bundle is a fragment, we need to include space for the
* fragment offset and the original payload length.
*
* Note: Any changes to this protocol must be reflected into the
* FragmentManager since it depends on this length when
* calculating fragment sizes.
*/
if (bundle.is_fragment()) {
block_len += SDNV.encoding_len(bundle.frag_offset());
block_len += SDNV.encoding_len(bundle.orig_length());
}
// Format the processing flags.
primary.set_processing_flags(format_bundle_flags(bundle));
primary.set_processing_flags(format_bundle_flags(bundle));
primary.set_processing_flags(primary.processing_flags_value() | format_cos_flags(bundle));
primary.set_processing_flags(primary.processing_flags_value() | format_srr_flags(bundle));
/*
* Finally, add up the initial preamble and the variable
* length part.
*/
primary.set_block_length(block_len);
primary_len =
(int)
(1
+ SDNV.encoding_len(primary.processing_flags)
+ SDNV.encoding_len(primary.block_length())
+ primary.block_length_value());
Log.d(TAG, "get_primary_len: for bundleid = " + bundle.bundleid() + ": " + primary_len);
// Fill in the remaining values of 'primary' just for the sake of returning
// a complete data structure.
primary.set_version(BundleProtocol.CURRENT_VERSION);
primary.set_creation_time(bundle.creation_ts().seconds());
primary.set_creation_sequence(bundle.creation_ts().seqno());
primary.set_lifetime(bundle.expiration());
return primary_len;
}
/**
* Generate primary block by encoding all the metadata of the primary block and copy to primary
* block writeable buffer.
*
* @param bundle Bundle to generate
* @param xmit_blocks xmit_blocks of the bundle
* @param block Primary block of the bundle to generate and write to the writeable buffer
*/
public void generate_primary(final Bundle bundle, BlockInfoVec xmit_blocks, BlockInfo block) {
// point at the local dictionary
Dictionary dict = xmit_blocks.dict();
int primary_len = 0; // total length of the primary block
PrimaryBlock primary = new PrimaryBlock();
primary_len = get_primary_len(bundle, dict, primary);
block.set_contents(new SerializableByteBuffer(primary_len));
block.set_data_length((int) primary.block_length_value());
block.set_data_offset((int) (primary_len - primary.block_length_value()));
/*
* Advance buf and decrement len as we go through the process.
*/
IByteBuffer buf = block.writable_contents();
int len = primary_len;
Log.d(TAG, String.format("generating primary: length %s", primary_len));
// Stick the version number in the first byte.
buf.put((byte) BundleProtocol.CURRENT_VERSION);
len -= 1;
len -= write_sdnv(primary.processing_flags(), buf);
len -= write_sdnv(primary.block_length(), buf);
len -= write_sdnv(primary.dest_scheme_offset(), buf);
len -= write_sdnv(primary.dest_ssp_offset(), buf);
len -= write_sdnv(primary.source_scheme_offset(), buf);
len -= write_sdnv(primary.source_ssp_offset(), buf);
len -= write_sdnv(primary.replyto_scheme_offset(), buf);
len -= write_sdnv(primary.replyto_ssp_offset(), buf);
len -= write_sdnv(primary.custodian_scheme_offset(), buf);
len -= write_sdnv(primary.custodian_ssp_offset(), buf);
len -= write_sdnv(bundle.creation_ts().seconds(), buf);
len -= write_sdnv(bundle.creation_ts().seqno(), buf);
len -= write_sdnv(bundle.expiration(), buf);
len -= write_sdnv(primary.dictionary_length(), buf);
// Add the dictionary.
Log.d(TAG, "Current Buf: " + buf.position());
Log.d(TAG, "Dict length: " + dict.dict_length());
Log.d(TAG, "Dict length: " + dict.dict_length());
buf.put(dict.dict());
// memcpy(buf, dict->dict(), dict->length());
// buf += dict->length();
len -= dict.dict_length();
Log.d(TAG, "Preparing len:" + len);
/*
* If the bundle is a fragment, stuff in SDNVs for the fragment
* offset and original length.
*/
if (bundle.is_fragment()) {
len -= write_sdnv(bundle.frag_offset(), buf);
Log.d(TAG, "Preparing len:" + len);
len -= write_sdnv(bundle.orig_length(), buf);
Log.d(TAG, "Preparing len:" + len);
}
/*
* Asuming that get_primary_len is written correctly, len should
* now be zero since we initialized it to primary_len at the
* beginning of the function.
*/
buf.position(0);
assert (len == 0) : TAG + ": len not ==0";
Log.e(TAG, "Current Len: " + len);
}
