mirror of
https://github.com/qpdf/qpdf.git
synced 2024-09-21 17:49:08 +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>
|
|
#include <qpdf/QUtil.hh>
|
|
#include <qpdf/QTC.hh>
|
|
#include <stdexcept>
|
|
|
|
JSON::Members::~Members()
|
|
{
|
|
}
|
|
|
|
JSON::Members::Members(PointerHolder<JSON_value> value) :
|
|
value(value)
|
|
{
|
|
}
|
|
|
|
JSON::JSON(PointerHolder<JSON_value> value) :
|
|
m(new Members(value))
|
|
{
|
|
}
|
|
|
|
JSON::JSON_value::~JSON_value()
|
|
{
|
|
}
|
|
|
|
JSON::JSON_dictionary::~JSON_dictionary()
|
|
{
|
|
}
|
|
|
|
std::string JSON::JSON_dictionary::unparse(size_t depth) const
|
|
{
|
|
std::string result = "{";
|
|
bool first = true;
|
|
for (std::map<std::string, PointerHolder<JSON_value> >::const_iterator
|
|
iter = members.begin();
|
|
iter != members.end(); ++iter)
|
|
{
|
|
if (first)
|
|
{
|
|
first = false;
|
|
}
|
|
else
|
|
{
|
|
result.append(1, ',');
|
|
}
|
|
result.append(1, '\n');
|
|
result.append(2 * (1 + depth), ' ');
|
|
result += ("\"" + (*iter).first + "\": " +
|
|
(*iter).second->unparse(1 + depth));
|
|
}
|
|
if (! first)
|
|
{
|
|
result.append(1, '\n');
|
|
result.append(2 * depth, ' ');
|
|
}
|
|
result.append(1, '}');
|
|
return result;
|
|
}
|
|
|
|
JSON::JSON_array::~JSON_array()
|
|
{
|
|
}
|
|
|
|
std::string JSON::JSON_array::unparse(size_t depth) const
|
|
{
|
|
std::string result = "[";
|
|
bool first = true;
|
|
for (std::vector<PointerHolder<JSON_value> >::const_iterator iter =
|
|
elements.begin();
|
|
iter != elements.end(); ++iter)
|
|
{
|
|
if (first)
|
|
{
|
|
first = false;
|
|
}
|
|
else
|
|
{
|
|
result.append(1, ',');
|
|
}
|
|
result.append(1, '\n');
|
|
result.append(2 * (1 + depth), ' ');
|
|
result += (*iter)->unparse(1 + depth);
|
|
}
|
|
if (! first)
|
|
{
|
|
result.append(1, '\n');
|
|
result.append(2 * depth, ' ');
|
|
}
|
|
result.append(1, ']');
|
|
return result;
|
|
}
|
|
|
|
JSON::JSON_string::JSON_string(std::string const& utf8) :
|
|
encoded(encode_string(utf8))
|
|
{
|
|
}
|
|
|
|
JSON::JSON_string::~JSON_string()
|
|
{
|
|
}
|
|
|
|
std::string JSON::JSON_string::unparse(size_t) const
|
|
{
|
|
return "\"" + encoded + "\"";
|
|
}
|
|
|
|
JSON::JSON_number::JSON_number(long long value) :
|
|
encoded(QUtil::int_to_string(value))
|
|
{
|
|
}
|
|
|
|
JSON::JSON_number::JSON_number(double value) :
|
|
encoded(QUtil::double_to_string(value, 6))
|
|
{
|
|
}
|
|
|
|
JSON::JSON_number::JSON_number(std::string const& value) :
|
|
encoded(value)
|
|
{
|
|
}
|
|
|
|
JSON::JSON_number::~JSON_number()
|
|
{
|
|
}
|
|
|
|
std::string JSON::JSON_number::unparse(size_t) const
|
|
{
|
|
return encoded;
|
|
}
|
|
|
|
JSON::JSON_bool::JSON_bool(bool val) :
|
|
value(val)
|
|
{
|
|
}
|
|
|
|
JSON::JSON_bool::~JSON_bool()
|
|
{
|
|
}
|
|
|
|
std::string JSON::JSON_bool::unparse(size_t) const
|
|
{
|
|
return value ? "true" : "false";
|
|
}
|
|
|
|
JSON::JSON_null::~JSON_null()
|
|
{
|
|
}
|
|
|
|
std::string JSON::JSON_null::unparse(size_t) const
|
|
{
|
|
return "null";
|
|
}
|
|
|
|
std::string
|
|
JSON::unparse() const
|
|
{
|
|
if (0 == this->m->value.getPointer())
|
|
{
|
|
return "null";
|
|
}
|
|
else
|
|
{
|
|
return this->m->value->unparse(0);
|
|
}
|
|
}
|
|
|
|
std::string
|
|
JSON::encode_string(std::string const& str)
|
|
{
|
|
std::string result;
|
|
size_t len = str.length();
|
|
for (size_t i = 0; i < len; ++i)
|
|
{
|
|
unsigned char ch = static_cast<unsigned char>(str.at(i));
|
|
switch (ch)
|
|
{
|
|
case '\\':
|
|
result += "\\\\";
|
|
break;
|
|
case '\"':
|
|
result += "\\\"";
|
|
break;
|
|
case '\b':
|
|
result += "\\b";
|
|
break;
|
|
case '\n':
|
|
result += "\\n";
|
|
break;
|
|
case '\r':
|
|
result += "\\r";
|
|
break;
|
|
case '\t':
|
|
result += "\\t";
|
|
break;
|
|
default:
|
|
if (ch < 32)
|
|
{
|
|
result += "\\u" + QUtil::int_to_string_base(ch, 16, 4);
|
|
}
|
|
else
|
|
{
|
|
result.append(1, static_cast<char>(ch));
|
|
}
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
JSON
|
|
JSON::makeDictionary()
|
|
{
|
|
return JSON(new JSON_dictionary());
|
|
}
|
|
|
|
JSON
|
|
JSON::addDictionaryMember(std::string const& key, JSON const& val)
|
|
{
|
|
JSON_dictionary* obj = dynamic_cast<JSON_dictionary*>(
|
|
this->m->value.getPointer());
|
|
if (0 == obj)
|
|
{
|
|
throw std::runtime_error(
|
|
"JSON::addDictionaryMember called on non-dictionary");
|
|
}
|
|
if (val.m->value.getPointer())
|
|
{
|
|
obj->members[encode_string(key)] = val.m->value;
|
|
}
|
|
else
|
|
{
|
|
obj->members[encode_string(key)] = new JSON_null();
|
|
}
|
|
return obj->members[encode_string(key)];
|
|
}
|
|
|
|
JSON
|
|
JSON::makeArray()
|
|
{
|
|
return JSON(new JSON_array());
|
|
}
|
|
|
|
JSON
|
|
JSON::addArrayElement(JSON const& val)
|
|
{
|
|
JSON_array* arr = dynamic_cast<JSON_array*>(
|
|
this->m->value.getPointer());
|
|
if (0 == arr)
|
|
{
|
|
throw std::runtime_error("JSON::addArrayElement called on non-array");
|
|
}
|
|
if (val.m->value.getPointer())
|
|
{
|
|
arr->elements.push_back(val.m->value);
|
|
}
|
|
else
|
|
{
|
|
arr->elements.push_back(new JSON_null());
|
|
}
|
|
return arr->elements.back();
|
|
}
|
|
|
|
JSON
|
|
JSON::makeString(std::string const& utf8)
|
|
{
|
|
return JSON(new JSON_string(utf8));
|
|
}
|
|
|
|
JSON
|
|
JSON::makeInt(long long int value)
|
|
{
|
|
return JSON(new JSON_number(value));
|
|
}
|
|
|
|
JSON
|
|
JSON::makeReal(double value)
|
|
{
|
|
return JSON(new JSON_number(value));
|
|
}
|
|
|
|
JSON
|
|
JSON::makeNumber(std::string const& encoded)
|
|
{
|
|
return JSON(new JSON_number(encoded));
|
|
}
|
|
|
|
JSON
|
|
JSON::makeBool(bool value)
|
|
{
|
|
return JSON(new JSON_bool(value));
|
|
}
|
|
|
|
JSON
|
|
JSON::makeNull()
|
|
{
|
|
return JSON(new JSON_null());
|
|
}
|
|
|
|
bool
|
|
JSON::checkSchema(JSON schema, std::list<std::string>& errors)
|
|
{
|
|
return checkSchemaInternal(this->m->value.getPointer(),
|
|
schema.m->value.getPointer(),
|
|
errors, "");
|
|
}
|
|
|
|
|
|
bool
|
|
JSON::checkSchemaInternal(JSON_value* this_v, JSON_value* sch_v,
|
|
std::list<std::string>& errors,
|
|
std::string prefix)
|
|
{
|
|
JSON_array* this_arr = dynamic_cast<JSON_array*>(this_v);
|
|
JSON_dictionary* this_dict = dynamic_cast<JSON_dictionary*>(this_v);
|
|
|
|
JSON_array* sch_arr = dynamic_cast<JSON_array*>(sch_v);
|
|
JSON_dictionary* sch_dict = dynamic_cast<JSON_dictionary*>(sch_v);
|
|
|
|
std::string err_prefix;
|
|
if (prefix.empty())
|
|
{
|
|
err_prefix = "top-level object";
|
|
}
|
|
else
|
|
{
|
|
err_prefix = "json key \"" + prefix + "\"";
|
|
}
|
|
|
|
if (sch_dict)
|
|
{
|
|
if (! this_dict)
|
|
{
|
|
QTC::TC("libtests", "JSON wanted dictionary");
|
|
errors.push_back(err_prefix + " is supposed to be a dictionary");
|
|
return false;
|
|
}
|
|
for (std::map<std::string, PointerHolder<JSON_value> >::iterator iter =
|
|
sch_dict->members.begin();
|
|
iter != sch_dict->members.end(); ++iter)
|
|
{
|
|
std::string const& key = (*iter).first;
|
|
if (this_dict->members.count(key))
|
|
{
|
|
checkSchemaInternal(
|
|
this_dict->members[key].getPointer(),
|
|
(*iter).second.getPointer(),
|
|
errors, prefix + "." + key);
|
|
}
|
|
else
|
|
{
|
|
QTC::TC("libtests", "JSON key missing in object");
|
|
errors.push_back(
|
|
err_prefix + ": key \"" + key +
|
|
"\" is present in schema but missing in object");
|
|
}
|
|
}
|
|
for (std::map<std::string, PointerHolder<JSON_value> >::iterator iter =
|
|
this_dict->members.begin();
|
|
iter != this_dict->members.end(); ++iter)
|
|
{
|
|
std::string const& key = (*iter).first;
|
|
if (sch_dict->members.count(key) == 0)
|
|
{
|
|
QTC::TC("libtests", "JSON key extra in object");
|
|
errors.push_back(
|
|
err_prefix + ": key \"" + key +
|
|
"\" is not present in schema but appears in object");
|
|
}
|
|
}
|
|
}
|
|
else if (sch_arr)
|
|
{
|
|
if (! this_arr)
|
|
{
|
|
QTC::TC("libtests", "JSON wanted array");
|
|
errors.push_back(err_prefix + " is supposed to be an array");
|
|
return false;
|
|
}
|
|
if (sch_arr->elements.size() != 1)
|
|
{
|
|
QTC::TC("libtests", "JSON schema array error");
|
|
errors.push_back(err_prefix +
|
|
" schema array contains other than one item");
|
|
return false;
|
|
}
|
|
int i = 0;
|
|
for (std::vector<PointerHolder<JSON_value> >::iterator iter =
|
|
this_arr->elements.begin();
|
|
iter != this_arr->elements.end(); ++iter, ++i)
|
|
{
|
|
checkSchemaInternal(
|
|
(*iter).getPointer(),
|
|
sch_arr->elements.at(0).getPointer(),
|
|
errors, prefix + "." + QUtil::int_to_string(i));
|
|
}
|
|
}
|
|
|
|
return errors.empty();
|
|
}
|