mirror of
https://github.com/oxen-io/lokinet.git
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401 lines
9.6 KiB
C++
401 lines
9.6 KiB
C++
#ifndef LLARP_BENCODE_HPP
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#define LLARP_BENCODE_HPP
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#include <util/buffer.hpp>
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#include <util/bencode.h>
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#include <util/fs.hpp>
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#include <util/logging/logger.hpp>
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#include <util/mem.hpp>
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#include <fstream>
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#include <set>
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#include <vector>
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namespace llarp
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{
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template < typename List_t >
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bool
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BEncodeReadList(List_t& result, llarp_buffer_t* buf);
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inline bool
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BEncodeWriteDictMsgType(llarp_buffer_t* buf, const char* k, const char* t)
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{
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return bencode_write_bytestring(buf, k, 1)
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&& bencode_write_bytestring(buf, t, 1);
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}
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template < typename Obj_t >
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bool
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BEncodeWriteDictString(const char* k, const Obj_t& str, llarp_buffer_t* buf)
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{
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return bencode_write_bytestring(buf, k, 1)
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&& bencode_write_bytestring(buf, str.data(), str.size());
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}
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template < typename Obj_t >
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bool
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BEncodeWriteDictEntry(const char* k, const Obj_t& o, llarp_buffer_t* buf)
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{
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return bencode_write_bytestring(buf, k, 1) && o.BEncode(buf);
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}
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template < typename Int_t >
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bool
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BEncodeWriteDictInt(const char* k, const Int_t& i, llarp_buffer_t* buf)
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{
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return bencode_write_bytestring(buf, k, 1) && bencode_write_uint64(buf, i);
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}
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template < typename List_t >
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bool
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BEncodeMaybeReadDictList(const char* k, List_t& item, bool& read,
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const llarp_buffer_t& key, llarp_buffer_t* buf)
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{
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if(key == k)
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{
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if(!BEncodeReadList(item, buf))
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{
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return false;
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}
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read = true;
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}
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return true;
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}
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template < typename Item_t >
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bool
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BEncodeMaybeReadDictEntry(const char* k, Item_t& item, bool& read,
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const llarp_buffer_t& key, llarp_buffer_t* buf)
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{
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if(key == k)
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{
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if(!item.BDecode(buf))
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{
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llarp::LogWarnTag("llarp/bencode.hpp", "failed to decode key ", k,
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" for entry in dict");
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return false;
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}
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read = true;
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}
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return true;
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}
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template < typename Int_t >
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bool
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BEncodeMaybeReadDictInt(const char* k, Int_t& i, bool& read,
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const llarp_buffer_t& key, llarp_buffer_t* buf)
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{
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if(key == k)
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{
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uint64_t read_i;
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if(!bencode_read_integer(buf, &read_i))
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{
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llarp::LogWarnTag("llarp/BEncode.hpp", "failed to decode key ", k,
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" for integer in dict");
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return false;
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}
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i = Int_t(read_i);
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read = true;
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}
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return true;
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}
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/// If the key matches, reads in the version and ensures that it equals the
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/// expected version
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template < typename Item_t >
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bool
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BEncodeMaybeVerifyVersion(const char* k, Item_t& item, uint64_t expect,
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bool& read, const llarp_buffer_t& key,
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llarp_buffer_t* buf)
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{
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if(key == k)
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{
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if(!bencode_read_integer(buf, &item))
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return false;
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read = item == expect;
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}
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return true;
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}
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template < typename List_t >
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bool
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BEncodeWriteDictBEncodeList(const char* k, const List_t& l,
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llarp_buffer_t* buf)
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{
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if(!bencode_write_bytestring(buf, k, 1))
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return false;
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if(!bencode_start_list(buf))
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return false;
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for(const auto& item : l)
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if(!item->BEncode(buf))
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return false;
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return bencode_end(buf);
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}
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template < typename Array >
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bool
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BEncodeWriteDictArray(const char* k, const Array& array, llarp_buffer_t* buf)
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{
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if(!bencode_write_bytestring(buf, k, 1))
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return false;
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if(!bencode_start_list(buf))
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return false;
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for(size_t idx = 0; idx < array.size(); ++idx)
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if(!array[idx].BEncode(buf))
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return false;
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return bencode_end(buf);
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}
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template < typename Iter >
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bool
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BEncodeWriteList(Iter itr, Iter end, llarp_buffer_t* buf)
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{
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if(!bencode_start_list(buf))
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return false;
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while(itr != end)
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if(!itr->BEncode(buf))
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return false;
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else
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++itr;
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return bencode_end(buf);
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}
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template < typename Sink >
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bool
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bencode_read_dict(Sink&& sink, llarp_buffer_t* buffer)
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{
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if(buffer->size_left() < 2) // minimum case is 'de'
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return false;
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if(*buffer->cur != 'd') // ensure is a dictionary
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return false;
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buffer->cur++;
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while(buffer->size_left() && *buffer->cur != 'e')
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{
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llarp_buffer_t strbuf; // temporary buffer for current element
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if(bencode_read_string(buffer, &strbuf))
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{
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if(!sink(buffer, &strbuf)) // check for early abort
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return false;
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}
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else
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return false;
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}
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if(*buffer->cur != 'e')
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{
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llarp::LogWarn("reading dict not ending on 'e'");
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// make sure we're at dictionary end
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return false;
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}
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buffer->cur++;
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return sink(buffer, nullptr);
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}
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template < typename Sink >
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bool
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bencode_decode_dict(Sink&& sink, llarp_buffer_t* buff)
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{
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return bencode_read_dict(
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[&](llarp_buffer_t* buffer, llarp_buffer_t* key) {
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if(key == nullptr)
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return true;
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if(sink.DecodeKey(*key, buffer))
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return true;
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llarp::LogWarnTag("llarp/bencode.hpp", "undefined key '", *key->cur,
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"' for entry in dict");
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return false;
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},
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buff);
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}
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template < typename Sink >
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bool
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bencode_read_list(Sink&& sink, llarp_buffer_t* buffer)
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{
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if(buffer->size_left() < 2) // minimum case is 'le'
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return false;
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if(*buffer->cur != 'l') // ensure is a list
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{
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llarp::LogWarn("bencode::bencode_read_list - expecting list got ",
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*buffer->cur);
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return false;
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}
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buffer->cur++;
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while(buffer->size_left() && *buffer->cur != 'e')
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{
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if(!sink(buffer, true)) // check for early abort
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return false;
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}
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if(*buffer->cur != 'e') // make sure we're at a list end
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return false;
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buffer->cur++;
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return sink(buffer, false);
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}
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template < typename Array >
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bool
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BEncodeReadArray(Array& array, llarp_buffer_t* buf)
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{
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size_t idx = 0;
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return bencode_read_list(
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[&array, &idx](llarp_buffer_t* buffer, bool has) {
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if(has)
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{
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if(idx >= array.size())
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return false;
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if(!array[idx++].BDecode(buffer))
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return false;
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}
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return true;
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},
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buf);
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}
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template < typename List_t >
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bool
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BEncodeReadList(List_t& result, llarp_buffer_t* buf)
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{
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return bencode_read_list(
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[&result](llarp_buffer_t* buffer, bool has) {
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if(has)
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{
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if(!result.emplace(result.end())->BDecode(buffer))
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{
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return false;
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}
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}
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return true;
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},
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buf);
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}
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template < typename List_t >
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bool
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BEncodeWriteDictList(const char* k, List_t& list, llarp_buffer_t* buf)
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{
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return bencode_write_bytestring(buf, k, 1)
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&& BEncodeWriteList(list.begin(), list.end(), buf);
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}
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template < size_t bufsz, typename T >
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void
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Dump(const T& val)
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{
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std::array< byte_t, bufsz > tmp;
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llarp_buffer_t buf(tmp);
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if(val.BEncode(&buf))
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{
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llarp::DumpBuffer< decltype(buf), 128 >(buf);
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}
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}
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/// read entire file and decode its contents into t
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template < typename T >
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bool
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BDecodeReadFile(const char* fpath, T& t)
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{
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std::vector< byte_t > ptr;
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{
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std::ifstream f;
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f.open(fpath);
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if(!f.is_open())
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{
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return false;
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}
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f.seekg(0, std::ios::end);
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const std::streampos sz = f.tellg();
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f.seekg(0, std::ios::beg);
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ptr.resize(sz);
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f.read((char*)ptr.data(), sz);
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}
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llarp_buffer_t buf(ptr);
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return t.BDecode(&buf);
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}
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/// read entire file and decode its contents into t
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template < typename T >
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bool
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BDecodeReadFromFile(const char* fpath, T& t)
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{
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std::vector< byte_t > ptr;
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{
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std::ifstream f;
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f.open(fpath);
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if(!f.is_open())
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{
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return false;
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}
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f.seekg(0, std::ios::end);
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const std::streampos sz = f.tellg();
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f.seekg(0, std::ios::beg);
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ptr.resize(sz);
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f.read((char*)ptr.data(), sz);
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}
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llarp_buffer_t buf(ptr);
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auto result = bencode_decode_dict(t, &buf);
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if(!result)
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{
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LogError("BDecodeReadFromFile() failed for file ", fpath, " contents:");
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DumpBuffer(buf);
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}
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return result;
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}
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/// bencode and write to file
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template < typename T, size_t bufsz >
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bool
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BEncodeWriteFile(const char* fpath, const T& t)
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{
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std::array< byte_t, bufsz > tmp;
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llarp_buffer_t buf(tmp);
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if(!t.BEncode(&buf))
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return false;
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buf.sz = buf.cur - buf.base;
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{
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const fs::path path = std::string(fpath);
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auto optional_f =
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llarp::util::OpenFileStream< std::ofstream >(path, std::ios::binary);
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if(!optional_f)
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return false;
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auto& f = optional_f.value();
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if(!f.is_open())
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return false;
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f.write((char*)buf.base, buf.sz);
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}
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return true;
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}
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/// seek for an int in a dict with a key k used for version
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/// set v to parsed value if found
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/// this call rewinds the buffer unconditionally before return
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/// returns false only if there was
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template < typename Int_t >
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bool
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BEncodeSeekDictVersion(Int_t& v, llarp_buffer_t* buf, const byte_t k)
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{
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const auto ret = bencode_read_dict(
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[&v, k](llarp_buffer_t* buffer, llarp_buffer_t* key) -> bool {
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if(key == nullptr)
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return true;
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if(key->sz == 1 && *key->cur == k)
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{
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return bencode_read_integer(buffer, &v);
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}
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return bencode_discard(buffer);
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},
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buf);
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// rewind
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buf->cur = buf->base;
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return ret;
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}
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} // namespace llarp
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#endif
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