Bitcoin Core  24.99.0
P2P Digital Currency
univalue_get.cpp
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1 // Copyright 2014 BitPay Inc.
2 // Copyright 2015 Bitcoin Core Developers
3 // Distributed under the MIT software license, see the accompanying
4 // file COPYING or https://opensource.org/licenses/mit-license.php.
5 
6 #include <univalue.h>
7 
8 #include <cerrno>
9 #include <cstdint>
10 #include <cstdlib>
11 #include <cstring>
12 #include <limits>
13 #include <locale>
14 #include <sstream>
15 #include <stdexcept>
16 #include <string>
17 #include <vector>
18 
19 namespace
20 {
21 static bool ParsePrechecks(const std::string& str)
22 {
23  if (str.empty()) // No empty string allowed
24  return false;
25  if (str.size() >= 1 && (json_isspace(str[0]) || json_isspace(str[str.size()-1]))) // No padding allowed
26  return false;
27  if (str.size() != strlen(str.c_str())) // No embedded NUL characters allowed
28  return false;
29  return true;
30 }
31 
32 bool ParseDouble(const std::string& str, double *out)
33 {
34  if (!ParsePrechecks(str))
35  return false;
36  if (str.size() >= 2 && str[0] == '0' && str[1] == 'x') // No hexadecimal floats allowed
37  return false;
38  std::istringstream text(str);
39  text.imbue(std::locale::classic());
40  double result;
41  text >> result;
42  if(out) *out = result;
43  return text.eof() && !text.fail();
44 }
45 }
46 
47 const std::vector<std::string>& UniValue::getKeys() const
48 {
49  checkType(VOBJ);
50  return keys;
51 }
52 
53 const std::vector<UniValue>& UniValue::getValues() const
54 {
55  if (typ != VOBJ && typ != VARR)
56  throw std::runtime_error("JSON value is not an object or array as expected");
57  return values;
58 }
59 
60 bool UniValue::get_bool() const
61 {
63  return getBool();
64 }
65 
66 const std::string& UniValue::get_str() const
67 {
68  checkType(VSTR);
69  return getValStr();
70 }
71 
72 double UniValue::get_real() const
73 {
74  checkType(VNUM);
75  double retval;
76  if (!ParseDouble(getValStr(), &retval))
77  throw std::runtime_error("JSON double out of range");
78  return retval;
79 }
80 
82 {
83  checkType(VOBJ);
84  return *this;
85 }
86 
88 {
89  checkType(VARR);
90  return *this;
91 }
UniValue::VType typ
Definition: univalue.h:107
const std::string & get_str() const
@ VOBJ
Definition: univalue.h:20
@ VSTR
Definition: univalue.h:20
@ VARR
Definition: univalue.h:20
@ VNUM
Definition: univalue.h:20
@ VBOOL
Definition: univalue.h:20
const UniValue & get_obj() const
const std::string & getValStr() const
Definition: univalue.h:67
const std::vector< UniValue > & getValues() const
const std::vector< std::string > & getKeys() const
std::vector< UniValue > values
Definition: univalue.h:110
std::vector< std::string > keys
Definition: univalue.h:109
void checkType(const VType &expected) const
Definition: univalue.cpp:210
const UniValue & get_array() const
bool getBool() const
Definition: univalue.h:72
double get_real() const
bool get_bool() const
static bool json_isspace(int ch)
Definition: univalue.h:191