cbor

const (
	// BigIntConvertShortest makes big.Int encode to CBOR integer if value fits.
	// E.g. if big.Int value can be converted to CBOR integer while preserving
	// value, encoder will encode it to CBOR interger (major type 0 or 1).
	BigIntConvertShortest BigIntConvertMode = iota

	// BigIntConvertNone makes big.Int encode to CBOR bignum (tag 2 or 3) without
	// converting it to another CBOR type.
	BigIntConvertNone
)

const (
	// DecTagIgnored makes decoder ignore tag number (skips if present).
	DecTagIgnored DecTagMode = iota

	// DecTagOptional makes decoder verify tag number if it's present.
	DecTagOptional

	// DecTagRequired makes decoder verify tag number and tag number must be present.
	DecTagRequired
)

const (
	// DupMapKeyQuiet doesn't enforce duplicate map key. Decoder quietly (no error)
	// uses faster of "keep first" or "keep last" depending on Go data type and other factors.
	DupMapKeyQuiet DupMapKeyMode = iota

	// DupMapKeyEnforcedAPF enforces detection and rejection of duplicate map keys.
	// APF means "Allow Partial Fill" and the destination map or struct can be partially filled.
	// If a duplicate map key is detected, DupMapKeyError is returned without further decoding
	// of the map. It's the caller's responsibility to respond to DupMapKeyError by
	// discarding the partially filled result if their protocol requires it.
	// WARNING: using DupMapKeyEnforcedAPF will decrease performance and increase memory use.
	DupMapKeyEnforcedAPF
)

const (
	// EncTagNone makes encoder not encode tag number.
	EncTagNone EncTagMode = iota

	// EncTagRequired makes encoder encode tag number.
	EncTagRequired
)

const ExtraDecErrorNone ExtraDecErrorCond = 0

const (
	// ExtraDecErrorUnknownField indicates error condition when destination
	// Go struct doesn't have a field matching a CBOR map key.
	ExtraDecErrorUnknownField ExtraDecErrorCond = 1 << iota
)

const (
	// IndefLengthAllowed allows indefinite length items.
	IndefLengthAllowed IndefLengthMode = iota

	// IndefLengthForbidden disallows indefinite length items.
	IndefLengthForbidden
)

const (
	// InfConvertFloat16 always converts Inf to lossless IEEE binary16 (float16).
	InfConvertFloat16 InfConvertMode = iota

	// InfConvertNone never converts (used by CTAP2 Canonical CBOR).
	InfConvertNone
)

const (
	// IntDecConvertNone affects how CBOR int (major type 0 and 1) decodes to Go interface{}.
	// It makes CBOR positive int (major type 0) decode to uint64 value, and
	// CBOR negative int (major type 1) decode to int64 value.
	IntDecConvertNone IntDecMode = iota

	// IntDecConvertSigned affects how CBOR int (major type 0 and 1) decodes to Go interface{}.
	// It makes CBOR positive/negative int (major type 0 and 1) decode to int64 value.
	// If value overflows int64, UnmarshalTypeError is returned.
	IntDecConvertSigned
)

const (
	// MapKeyByteStringFail affects how a CBOR byte string as a map key is decoded.
	// It makes the parsing fail as Go cannot use []byte as a map key.
	MapKeyByteStringFail MapKeyByteStringMode = iota

	// MapKeyByteStringWrap affects how a CBOR byte string as a map key is decoded.
	// It allows the parsing to succeed by wrapping the byte string in a wrapper object
	// that can be used as a map key in Go.
	MapKeyByteStringWrap
)

const (
	// NaNConvert7e00 always encodes NaN to 0xf97e00 (CBOR float16 = 0x7e00).
	NaNConvert7e00 NaNConvertMode = iota

	// NaNConvertNone never modifies or converts NaN to other representations
	// (float64 NaN stays float64, etc. even if it can use float16 without losing
	// any bits).
	NaNConvertNone

	// NaNConvertPreserveSignal converts NaN to the smallest form that preserves
	// value (quiet bit + payload) as described in RFC 7049bis Draft 12.
	NaNConvertPreserveSignal

	// NaNConvertQuiet always forces quiet bit = 1 and shortest form that preserves
	// NaN payload.
	NaNConvertQuiet
)

const (

	// PrecisionExact is for non-subnormals that don't drop bits during conversion.
	// All of these can round-trip.  Should always convert to float16.
	PrecisionExact Precision = iota

	// PrecisionUnknown is for subnormals that don't drop bits during conversion but
	// not all of these can round-trip so precision is unknown without more effort.
	// Only 2046 of these can round-trip and the rest cannot round-trip.
	PrecisionUnknown

	// PrecisionInexact is for dropped significand bits and cannot round-trip.
	// Some of these are subnormals. Cannot round-trip float32->float16->float32.
	PrecisionInexact

	// PrecisionUnderflow is for Underflows. Cannot round-trip float32->float16->float32.
	PrecisionUnderflow

	// PrecisionOverflow is for Overflows. Cannot round-trip float32->float16->float32.
	PrecisionOverflow
)

const (
	// ShortestFloatNone makes float values encode without any conversion.
	// This is the default for ShortestFloatMode in v1.
	// E.g. a float32 in Go will encode to CBOR float32.  And
	// a float64 in Go will encode to CBOR float64.
	ShortestFloatNone ShortestFloatMode = iota

	// ShortestFloat16 specifies float16 as the shortest form that preserves value.
	// E.g. if float64 can convert to float32 while preserving value, then
	// encoding will also try to convert float32 to float16.  So a float64 might
	// encode as CBOR float64, float32 or float16 depending on the value.
	ShortestFloat16
)

const (
	// SortNone means no sorting.
	SortNone SortMode = 0

	// SortLengthFirst causes map keys or struct fields to be sorted such that:
	//     - If two keys have different lengths, the shorter one sorts earlier;
	//     - If two keys have the same length, the one with the lower value in
	//       (byte-wise) lexical order sorts earlier.
	// It is used in "Canonical CBOR" encoding in RFC 7049 3.9.
	SortLengthFirst SortMode = 1

	// SortBytewiseLexical causes map keys or struct fields to be sorted in the
	// bytewise lexicographic order of their deterministic CBOR encodings.
	// It is used in "CTAP2 Canonical CBOR" and "Core Deterministic Encoding"
	// in RFC 7049bis.
	SortBytewiseLexical SortMode = 2

	// SortCanonical is used in "Canonical CBOR" encoding in RFC 7049 3.9.
	SortCanonical SortMode = SortLengthFirst

	// SortCTAP2 is used in "CTAP2 Canonical CBOR".
	SortCTAP2 SortMode = SortBytewiseLexical

	// SortCoreDeterministic is used in "Core Deterministic Encoding" in RFC 7049bis.
	SortCoreDeterministic SortMode = SortBytewiseLexical
)

const (
	// TagsAllowed allows CBOR tags.
	TagsAllowed TagsMode = iota

	// TagsForbidden disallows CBOR tags.
	TagsForbidden
)

const (
	// TimeUnix causes time.Time to be encoded as epoch time in integer with second precision.
	TimeUnix TimeMode = iota

	// TimeUnixMicro causes time.Time to be encoded as epoch time in float-point rounded to microsecond precision.
	TimeUnixMicro

	// TimeUnixDynamic causes time.Time to be encoded as integer if time.Time doesn't have fractional seconds,
	// otherwise float-point rounded to microsecond precision.
	TimeUnixDynamic

	// TimeRFC3339 causes time.Time to be encoded as RFC3339 formatted string with second precision.
	TimeRFC3339

	// TimeRFC3339Nano causes time.Time to be encoded as RFC3339 formatted string with nanosecond precision.
	TimeRFC3339Nano
)