Electroneum
levin_helper.h
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1 // Copyright (c) 2006-2013, Andrey N. Sabelnikov, www.sabelnikov.net
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26 
27 
28 
29 #pragma once
30 
31 #include "levin_base.h"
32 #include "serializeble_struct_helper.h"
33 #include "int-util.h"
34 
35 #undef ELECTRONEUM_DEFAULT_LOG_CATEGORY
36 #define ELECTRONEUM_DEFAULT_LOG_CATEGORY "net"
37 
38 namespace epee
39 {
40 namespace levin
41 {
42  template<class t_struct>
43  bool pack_struct_to_levin_message(const t_struct& t, std::string& buff, int command_id)
44  {
45  buff.resize(sizeof(levin::bucket_head));
47  head.m_signature = SWAP64LE(LEVIN_SIGNATURE);
48  head.m_cb = 0;
49  head.m_have_to_return_data = true;
50  head.m_command = SWAP32LE(command_id);
51  head.m_return_code = SWAP32LE(1);
52  head.m_reservedA = rand(); //probably some flags in future
53  head.m_reservedB = rand(); //probably some check summ in future
54 
55  std::string buff_strg;
56  if(!StorageNamed::save_struct_as_storage_to_buff_t<t_struct, StorageNamed::DefaultStorageType>(t, buff_strg))
57  return false;
58 
59  head.m_cb = SWAP64LE(buff_strg.size());
60  buff.append(buff_strg);
61  return true;
62  }
63 
64 
65  bool pack_data_to_levin_message(const std::string& data, std::string& buff, int command_id)
66  {
67  buff.resize(sizeof(levin::bucket_head));
69  head.m_signature = SWAP64LE(LEVIN_SIGNATURE);
70  head.m_cb = 0;
71  head.m_have_to_return_data = true;
72  head.m_command = SWAP32LE(command_id);
73  head.m_return_code = SWAP32LE(1);
74  head.m_reservedA = rand(); //probably some flags in future
75  head.m_reservedB = rand(); //probably some check summ in future
76 
77  head.m_cb = SWAP64LE(data.size());
78  buff.append(data);
79  return true;
80  }
81 
82  bool load_levin_data_from_levin_message(std::string& levin_data, const std::string& buff, int& command)
83  {
84  if(buff.size() < sizeof(levin::bucket_head) )
85  {
86  LOG_PRINT_L3("size of buff(" << buff.size() << ") is too small, at load_struct_from_levin_message");
87  return false;
88  }
89 
90 #if BYTE_ORDER == LITTLE_ENDIAN
92 #else
94  head.m_signature = SWAP64LE(head.m_signature);
95  head.m_cb = SWAP64LE(head.m_cb);
96  head.m_command = SWAP32LE(head.m_command);
97  head.m_return_code = SWAP32LE(head.m_return_code);
98  head.m_reservedA = SWAP32LE(head.m_reservedA);
99  head.m_reservedB = SWAP32LE(head.m_reservedB);
100 #endif
101  if(head.m_signature != LEVIN_SIGNATURE)
102  {
103  LOG_PRINT_L3("Failed to read signature in levin message, at load_struct_from_levin_message");
104  return false;
105  }
106  if(head.m_cb != buff.size()-sizeof(levin::bucket_head))
107  {
108  LOG_PRINT_L3("sizes mismatch, at load_struct_from_levin_message");
109  return false;
110  }
111 
112  //std::string buff_strg;
113  levin_data.assign(&buff[sizeof(levin::bucket_head)], buff.size()-sizeof(levin::bucket_head));
114  command = head.m_command;
115  return true;
116  }
117 
118  template<class t_struct>
119  bool load_struct_from_levin_message(t_struct& t, const std::string& buff, int& command)
120  {
121  if(buff.size() < sizeof(levin::bucket_head) )
122  {
123  LOG_ERROR("size of buff(" << buff.size() << ") is too small, at load_struct_from_levin_message");
124  return false;
125  }
126 
127 #if BYTE_ORDER == LITTLE_ENDIAN
128  levin::bucket_head &head = *(levin::bucket_head*)(&buff[0]);
129 #else
131  head.m_signature = SWAP64LE(head.m_signature);
132  head.m_cb = SWAP64LE(head.m_cb);
133  head.m_command = SWAP32LE(head.m_command);
134  head.m_return_code = SWAP32LE(head.m_return_code);
135  head.m_reservedA = SWAP32LE(head.m_reservedA);
136  head.m_reservedB = SWAP32LE(head.m_reservedB);
137 #endif
138  if(head.m_signature != LEVIN_SIGNATURE)
139  {
140  LOG_ERROR("Failed to read signature in levin message, at load_struct_from_levin_message");
141  return false;
142  }
143  if(head.m_cb != buff.size()-sizeof(levin::bucket_head))
144  {
145  LOG_ERROR("sizes mismatch, at load_struct_from_levin_message");
146  return false;
147  }
148 
149  std::string buff_strg;
150  buff_strg.assign(&buff[sizeof(levin::bucket_head)], buff.size()-sizeof(levin::bucket_head));
151 
152  if(!StorageNamed::load_struct_from_storage_buff_t<t_struct, StorageNamed::DefaultStorageType>(t, buff_strg))
153  {
154  LOG_ERROR("Failed to read storage, at load_struct_from_levin_message");
155  return false;
156  }
157  command = head.m_command;
158  return true;
159  }
160 }
161 }
bool load_levin_data_from_levin_message(std::string &levin_data, const std::string &buff, int &command)
Definition: levin_helper.h:82
#define LEVIN_SIGNATURE
Definition: levin_base.h:34
bool load_struct_from_levin_message(t_struct &t, const std::string &buff, int &command)
Definition: levin_helper.h:119
bool pack_data_to_levin_message(const std::string &data, std::string &buff, int command_id)
Definition: levin_helper.h:65
::std::string string
Definition: gtest-port.h:1097
void rand(size_t N, uint8_t *bytes)
Definition: crypto.h:209
#define LOG_PRINT_L3(x)
Definition: misc_log_ex.h:102
#define LOG_ERROR(x)
Definition: misc_log_ex.h:98
#define SWAP64LE
Definition: int-util.h:252
bool pack_struct_to_levin_message(const t_struct &t, std::string &buff, int command_id)
Definition: levin_helper.h:43
struct rule_list head
#define SWAP32LE
Definition: int-util.h:244