mirror of
https://github.com/qpdf/qpdf.git
synced 2024-12-23 03:18:59 +00:00
d71f05ca07
This makes all integer type conversions that have potential data loss explicit with calls that do range checks and raise an exception. After this commit, qpdf builds with no warnings when -Wsign-conversion -Wconversion is used with gcc or clang or when -W3 -Wd4800 is used with MSVC. This significantly reduces the likelihood of potential crashes from bogus integer values. There are some parts of the code that take int when they should take size_t or an offset. Such places would make qpdf not support files with more than 2^31 of something that usually wouldn't be so large. In the event that such a file shows up and is valid, at least qpdf would raise an error in the right spot so the issue could be legitimately addressed rather than failing in some weird way because of a silent overflow condition.
397 lines
8.7 KiB
C++
397 lines
8.7 KiB
C++
#include <qpdf/JSON.hh>
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#include <qpdf/QUtil.hh>
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#include <qpdf/QTC.hh>
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#include <stdexcept>
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JSON::Members::~Members()
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{
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}
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JSON::Members::Members(PointerHolder<JSON_value> value) :
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value(value)
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{
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}
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JSON::JSON(PointerHolder<JSON_value> value) :
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m(new Members(value))
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{
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}
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JSON::JSON_value::~JSON_value()
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{
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}
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JSON::JSON_dictionary::~JSON_dictionary()
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{
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}
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std::string JSON::JSON_dictionary::unparse(size_t depth) const
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{
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std::string result = "{";
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bool first = true;
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for (std::map<std::string, PointerHolder<JSON_value> >::const_iterator
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iter = members.begin();
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iter != members.end(); ++iter)
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{
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if (first)
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{
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first = false;
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}
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else
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{
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result.append(1, ',');
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}
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result.append(1, '\n');
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result.append(2 * (1 + depth), ' ');
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result += ("\"" + (*iter).first + "\": " +
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(*iter).second->unparse(1 + depth));
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}
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if (! first)
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{
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result.append(1, '\n');
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result.append(2 * depth, ' ');
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}
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result.append(1, '}');
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return result;
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}
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JSON::JSON_array::~JSON_array()
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{
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}
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std::string JSON::JSON_array::unparse(size_t depth) const
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{
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std::string result = "[";
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bool first = true;
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for (std::vector<PointerHolder<JSON_value> >::const_iterator iter =
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elements.begin();
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iter != elements.end(); ++iter)
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{
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if (first)
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{
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first = false;
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}
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else
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{
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result.append(1, ',');
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}
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result.append(1, '\n');
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result.append(2 * (1 + depth), ' ');
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result += (*iter)->unparse(1 + depth);
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}
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if (! first)
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{
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result.append(1, '\n');
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result.append(2 * depth, ' ');
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}
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result.append(1, ']');
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return result;
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}
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JSON::JSON_string::JSON_string(std::string const& utf8) :
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encoded(encode_string(utf8))
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{
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}
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JSON::JSON_string::~JSON_string()
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{
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}
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std::string JSON::JSON_string::unparse(size_t) const
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{
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return "\"" + encoded + "\"";
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}
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JSON::JSON_number::JSON_number(long long value) :
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encoded(QUtil::int_to_string(value))
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{
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}
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JSON::JSON_number::JSON_number(double value) :
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encoded(QUtil::double_to_string(value, 6))
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{
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}
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JSON::JSON_number::JSON_number(std::string const& value) :
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encoded(value)
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{
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}
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JSON::JSON_number::~JSON_number()
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{
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}
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std::string JSON::JSON_number::unparse(size_t) const
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{
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return encoded;
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}
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JSON::JSON_bool::JSON_bool(bool val) :
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value(val)
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{
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}
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JSON::JSON_bool::~JSON_bool()
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{
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}
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std::string JSON::JSON_bool::unparse(size_t) const
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{
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return value ? "true" : "false";
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}
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JSON::JSON_null::~JSON_null()
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{
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}
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std::string JSON::JSON_null::unparse(size_t) const
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{
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return "null";
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}
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std::string
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JSON::unparse() const
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{
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if (0 == this->m->value.getPointer())
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{
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return "null";
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}
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else
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{
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return this->m->value->unparse(0);
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}
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}
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std::string
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JSON::encode_string(std::string const& str)
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{
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std::string result;
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size_t len = str.length();
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for (size_t i = 0; i < len; ++i)
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{
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unsigned char ch = static_cast<unsigned char>(str.at(i));
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switch (ch)
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{
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case '\\':
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result += "\\\\";
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break;
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case '\"':
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result += "\\\"";
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break;
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case '\b':
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result += "\\b";
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break;
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case '\n':
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result += "\\n";
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break;
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case '\r':
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result += "\\r";
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break;
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case '\t':
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result += "\\t";
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break;
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default:
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if (ch < 32)
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{
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result += "\\u" + QUtil::int_to_string_base(ch, 16, 4);
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}
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else
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{
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result.append(1, static_cast<char>(ch));
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}
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}
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}
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return result;
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}
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JSON
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JSON::makeDictionary()
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{
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return JSON(new JSON_dictionary());
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}
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JSON
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JSON::addDictionaryMember(std::string const& key, JSON const& val)
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{
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JSON_dictionary* obj = dynamic_cast<JSON_dictionary*>(
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this->m->value.getPointer());
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if (0 == obj)
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{
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throw std::runtime_error(
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"JSON::addDictionaryMember called on non-dictionary");
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}
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if (val.m->value.getPointer())
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{
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obj->members[encode_string(key)] = val.m->value;
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}
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else
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{
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obj->members[encode_string(key)] = new JSON_null();
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}
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return obj->members[encode_string(key)];
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}
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JSON
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JSON::makeArray()
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{
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return JSON(new JSON_array());
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}
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JSON
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JSON::addArrayElement(JSON const& val)
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{
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JSON_array* arr = dynamic_cast<JSON_array*>(
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this->m->value.getPointer());
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if (0 == arr)
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{
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throw std::runtime_error("JSON::addArrayElement called on non-array");
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}
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if (val.m->value.getPointer())
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{
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arr->elements.push_back(val.m->value);
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}
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else
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{
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arr->elements.push_back(new JSON_null());
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}
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return arr->elements.back();
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}
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JSON
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JSON::makeString(std::string const& utf8)
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{
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return JSON(new JSON_string(utf8));
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}
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JSON
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JSON::makeInt(long long int value)
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{
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return JSON(new JSON_number(value));
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}
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JSON
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JSON::makeReal(double value)
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{
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return JSON(new JSON_number(value));
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}
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JSON
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JSON::makeNumber(std::string const& encoded)
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{
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return JSON(new JSON_number(encoded));
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}
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JSON
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JSON::makeBool(bool value)
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{
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return JSON(new JSON_bool(value));
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}
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JSON
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JSON::makeNull()
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{
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return JSON(new JSON_null());
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}
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bool
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JSON::checkSchema(JSON schema, std::list<std::string>& errors)
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{
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return checkSchemaInternal(this->m->value.getPointer(),
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schema.m->value.getPointer(),
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errors, "");
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}
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bool
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JSON::checkSchemaInternal(JSON_value* this_v, JSON_value* sch_v,
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std::list<std::string>& errors,
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std::string prefix)
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{
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JSON_array* this_arr = dynamic_cast<JSON_array*>(this_v);
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JSON_dictionary* this_dict = dynamic_cast<JSON_dictionary*>(this_v);
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JSON_array* sch_arr = dynamic_cast<JSON_array*>(sch_v);
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JSON_dictionary* sch_dict = dynamic_cast<JSON_dictionary*>(sch_v);
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std::string err_prefix;
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if (prefix.empty())
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{
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err_prefix = "top-level object";
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}
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else
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{
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err_prefix = "json key \"" + prefix + "\"";
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}
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if (sch_dict)
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{
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if (! this_dict)
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{
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QTC::TC("libtests", "JSON wanted dictionary");
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errors.push_back(err_prefix + " is supposed to be a dictionary");
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return false;
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}
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for (std::map<std::string, PointerHolder<JSON_value> >::iterator iter =
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sch_dict->members.begin();
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iter != sch_dict->members.end(); ++iter)
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{
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std::string const& key = (*iter).first;
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if (this_dict->members.count(key))
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{
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checkSchemaInternal(
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this_dict->members[key].getPointer(),
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(*iter).second.getPointer(),
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errors, prefix + "." + key);
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}
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else
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{
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QTC::TC("libtests", "JSON key missing in object");
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errors.push_back(
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err_prefix + ": key \"" + key +
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"\" is present in schema but missing in object");
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}
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}
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for (std::map<std::string, PointerHolder<JSON_value> >::iterator iter =
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this_dict->members.begin();
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iter != this_dict->members.end(); ++iter)
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{
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std::string const& key = (*iter).first;
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if (sch_dict->members.count(key) == 0)
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{
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QTC::TC("libtests", "JSON key extra in object");
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errors.push_back(
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err_prefix + ": key \"" + key +
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"\" is not present in schema but appears in object");
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}
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}
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}
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else if (sch_arr)
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{
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if (! this_arr)
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{
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QTC::TC("libtests", "JSON wanted array");
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errors.push_back(err_prefix + " is supposed to be an array");
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return false;
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}
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if (sch_arr->elements.size() != 1)
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{
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QTC::TC("libtests", "JSON schema array error");
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errors.push_back(err_prefix +
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" schema array contains other than one item");
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return false;
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}
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int i = 0;
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for (std::vector<PointerHolder<JSON_value> >::iterator iter =
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this_arr->elements.begin();
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iter != this_arr->elements.end(); ++iter, ++i)
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{
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checkSchemaInternal(
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(*iter).getPointer(),
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sch_arr->elements.at(0).getPointer(),
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errors, prefix + "." + QUtil::int_to_string(i));
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}
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}
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return errors.empty();
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}
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