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✨ add CBOR tag handler #1968

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This commit is contained in:
Niels Lohmann 2020-07-12 16:51:43 +02:00
parent cf741313b3
commit 3952739189
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GPG key ID: 7F3CEA63AE251B69
3 changed files with 204 additions and 34 deletions
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84
include/nlohmann/detail/input/binary_reader.hpp
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@ -24,6 +24,13 @@ namespace nlohmann
namespace detail
{
/// how to treat CBOR tags
enum class cbor_tag_handler_t
{
error, ///< throw a parse_error exception in case of a tag
ignore ///< ignore tags
};
/*!
@brief determine system byte order
@ -78,13 +85,15 @@ class binary_reader
@param[in] format the binary format to parse
@param[in] sax_ a SAX event processor
@param[in] strict whether to expect the input to be consumed completed
@param[in] tag_handler how to treat CBOR tags
@return
*/
JSON_HEDLEY_NON_NULL(3)
bool sax_parse(const input_format_t format,
json_sax_t* sax_,
const bool strict = true)
const bool strict = true,
const cbor_tag_handler_t tag_handler = cbor_tag_handler_t::error)
{
sax = sax_;
bool result = false;
@ -96,7 +105,7 @@ class binary_reader
break;
case input_format_t::cbor:
result = parse_cbor_internal();
result = parse_cbor_internal(true, tag_handler);
break;
case input_format_t::msgpack:
@ -386,10 +395,12 @@ class binary_reader
@param[in] get_char whether a new character should be retrieved from the
input (true, default) or whether the last read
character should be considered instead
@param[in] tag_handler how CBOR tags should be treated
@return whether a valid CBOR value was passed to the SAX parser
*/
bool parse_cbor_internal(const bool get_char = true)
bool parse_cbor_internal(const bool get_char = true,
cbor_tag_handler_t tag_handler = cbor_tag_handler_t::error)
{
switch (get_char ? get() : current)
{
@ -678,6 +689,73 @@ class binary_reader
case 0xBF: // map (indefinite length)
return get_cbor_object(std::size_t(-1));
case 0xC6: // tagged item
case 0xC7:
case 0xC8:
case 0xC9:
case 0xCA:
case 0xCB:
case 0xCC:
case 0xCD:
case 0xCE:
case 0xCF:
case 0xD0:
case 0xD1:
case 0xD2:
case 0xD3:
case 0xD4:
case 0xD8: // tagged item (1 bytes follow)
case 0xD9: // tagged item (2 bytes follow)
case 0xDA: // tagged item (4 bytes follow)
case 0xDB: // tagged item (8 bytes follow)
{
switch (tag_handler)
{
case cbor_tag_handler_t::error:
{
auto last_token = get_token_string();
return sax->parse_error(chars_read, last_token, parse_error::create(112, chars_read, exception_message(input_format_t::cbor, "invalid byte: 0x" + last_token, "value")));
}
case cbor_tag_handler_t::ignore:
{
switch (current)
{
case 0xD8:
{
std::uint8_t len{};
get_number(input_format_t::cbor, len);
break;
}
case 0xD9:
{
std::uint16_t len{};
get_number(input_format_t::cbor, len);
break;
}
case 0xDA:
{
std::uint32_t len{};
get_number(input_format_t::cbor, len);
break;
}
case 0xDB:
{
std::uint64_t len{};
get_number(input_format_t::cbor, len);
break;
}
default:
break;
}
return parse_cbor_internal(true, tag_handler);
}
default: // LCOV_EXCL_LINE
JSON_ASSERT(false); // LCOV_EXCL_LINE
}
}
case 0xF4: // false
return sax->boolean(false);