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2480 lines (2151 loc) Β· 61.2 KB
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/*
* Cadence - The resource-oriented smart contract programming language
*
* Copyright Flow Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package ccf
import (
"errors"
"fmt"
"math"
"math/big"
goRuntime "runtime"
_ "unsafe"
"github.com/fxamacker/cbor/v2"
fix "github.com/onflow/fixed-point"
"github.com/onflow/cadence"
"github.com/onflow/cadence/common"
cadenceErrors "github.com/onflow/cadence/errors"
)
// HasMsgPrefix returns true if the msg prefix (first few bytes)
// matches currently implemented top-level CCF messages:
// - ccf-typedef-and-value-message
// - ccf-type-and-value-message
// WARNING: For simplicity and performance, this does not check
// if msg is actually a CCF message, or well-formed, or valid.
func HasMsgPrefix(msg []byte) bool {
// Top level CCF messages are CBOR tag (tag number: CBORTagTypeDefAndValue | CBORTagTypeAndValue, content: array of 2 elements).
// Minimum size is 5 bytes: top level tag number (2 bytes) + min size for array of 2 elements (3 bytes).
const minTopLevelMsgSize = 5
if len(msg) < minTopLevelMsgSize {
return false
}
// There are 3 top messages defined in CCF specs:
// language=CDDL
// ccf-message = (
// ccf-typedef-message
// / ccf-typedef-and-value-message
// / ccf-type-and-value-message
// )
//
// Since ccf-typedef-message isn't implemented yet,
// check for these two messages:
// - ccf-typedef-and-value-message
// - ccf-type-and-valu8e-message
return msg[0] == 0xd8 && // 0xd8 is major type 6, semantic tag
(msg[1] == CBORTagTypeDefAndValue || msg[1] == CBORTagTypeAndValue) &&
msg[2] == 0x82 // 0x82 is CBOR array head of 2 elements
}
// defaultCBORDecMode
//
// See https://github.com/fxamacker/cbor:
// "For best performance, reuse EncMode and DecMode after creating them."
//
// Security Considerations in Section 10 of RFC 8949 states:
//
// "Hostile input may be constructed to overrun buffers, to overflow or underflow integer arithmetic,
// or to cause other decoding disruption. CBOR data items might have lengths or sizes that are
// intentionally extremely large or too short. Resource exhaustion attacks might attempt to lure a
// decoder into allocating very big data items (strings, arrays, maps, or even arbitrary precision numbers)
// or exhaust the stack depth by setting up deeply nested items. Decoders need to have appropriate resource
// management to mitigate these attacks."
var defaultCBORDecMode = func() cbor.DecMode {
decMode, err := cbor.DecOptions{
IndefLength: cbor.IndefLengthForbidden,
IntDec: cbor.IntDecConvertNone,
MaxArrayElements: 20_000_000, // 20 MB is current grpc size limit so this is more than enough
MaxMapPairs: 20_000_000, // 20 MB is current grpc size limit so this is more than enough
MaxNestedLevels: math.MaxInt16,
}.DecMode()
if err != nil {
panic(err)
}
return decMode
}()
// Decoder decodes CCF-encoded representations of Cadence values.
// Since CBOR security considerations apply to CCF, the CBOR
// codec used by CCF Decoder uses limits (e.g. MaxArrayElements,
// MaxMapPairs, MaxNestedLevels) specified by CBORDecMode.
type Decoder struct {
// CCF codec uses CBOR codec under the hood.
dec *cbor.StreamDecoder
gauge common.MemoryGauge
// CCF decoding mode contains immutable CCF decoding options.
dm *decMode
}
type DecMode interface {
// Decode returns a Cadence value decoded from its CCF-encoded representation.
//
// This function returns an error if the bytes represent CCF that is malformed,
// invalid, or does not comply with requirements in the CCF specification.
Decode(gauge common.MemoryGauge, b []byte) (cadence.Value, error)
// NewDecoder initializes a Decoder that will decode CCF-encoded bytes from the
// given bytes.
NewDecoder(gauge common.MemoryGauge, b []byte) *Decoder
}
// EnforceSortMode specifies how the decoder should enforce sort order.
type EnforceSortMode int
const (
// EnforceSortNone means sort order is not enforced by the decoder.
EnforceSortNone EnforceSortMode = iota
// EnforceSortBytewiseLexical requires sort order to be bytewise lexicographic.
EnforceSortBytewiseLexical
maxEnforceSortMode
)
func (esm EnforceSortMode) valid() bool {
return esm < maxEnforceSortMode
}
// DecOptions specifies CCF decoding options which can be used to create immutable DecMode.
type DecOptions struct {
// EnforceSortCompositeFields specifies how decoder should enforce sort order of composite fields.
EnforceSortCompositeFields EnforceSortMode
// EnforceSortIntersectionTypes specifies how decoder should enforce sort order of intersection types.
EnforceSortIntersectionTypes EnforceSortMode
// EnforceSortEntitlementTypes specifies how decoder should enforce sort order of entitlement types.
EnforceSortEntitlementTypes EnforceSortMode
// CBORDecMode will default to defaultCBORDecMode if nil. The decoding mode contains
// immutable decoding options (cbor.DecOptions) and is safe for concurrent use.
CBORDecMode cbor.DecMode
}
// EventsDecMode is CCF decoding mode for events which contains
// immutable CCF decoding options. It is safe for concurrent use.
var EventsDecMode = &decMode{
enforceSortCompositeFields: EnforceSortNone,
enforceSortRestrictedTypes: EnforceSortNone,
enforceSortEntitlementTypes: EnforceSortNone,
cborDecMode: defaultCBORDecMode,
}
type decMode struct {
enforceSortCompositeFields EnforceSortMode
enforceSortRestrictedTypes EnforceSortMode
enforceSortEntitlementTypes EnforceSortMode
cborDecMode cbor.DecMode
}
// DecMode returns CCF decoding mode which contains immutable decoding options.
// The returned DecMode is safe for concurrent use.
func (opts DecOptions) DecMode() (DecMode, error) {
if !opts.EnforceSortCompositeFields.valid() {
return nil, fmt.Errorf("ccf: invalid EnforceSortCompositeFields %d", opts.EnforceSortCompositeFields)
}
if !opts.EnforceSortIntersectionTypes.valid() {
return nil, fmt.Errorf("ccf: invalid EnforceSortRestrictedTypes %d", opts.EnforceSortIntersectionTypes)
}
if !opts.EnforceSortEntitlementTypes.valid() {
return nil, fmt.Errorf("ccf: invalid EnforceSortEntitlementTypes %d", opts.EnforceSortEntitlementTypes)
}
if opts.CBORDecMode == nil {
opts.CBORDecMode = defaultCBORDecMode
}
return &decMode{
enforceSortCompositeFields: opts.EnforceSortCompositeFields,
enforceSortRestrictedTypes: opts.EnforceSortIntersectionTypes,
enforceSortEntitlementTypes: opts.EnforceSortEntitlementTypes,
cborDecMode: opts.CBORDecMode,
}, nil
}
// Decode returns a Cadence value decoded from its CCF-encoded representation.
//
// This function returns an error if the bytes represent CCF that is malformed,
// invalid, or does not comply with requirements in the CCF specification.
func (dm *decMode) Decode(gauge common.MemoryGauge, b []byte) (cadence.Value, error) {
dec := dm.NewDecoder(gauge, b)
v, err := dec.Decode()
if err != nil {
return nil, err
}
if dec.dec.NumBytesDecoded() != len(b) {
return nil, cadenceErrors.NewDefaultUserError("ccf: failed to decode: decoded %d bytes, received %d bytes", dec.dec.NumBytesDecoded(), len(b))
}
return v, nil
}
// NewDecoder initializes a Decoder that will decode CCF-encoded bytes from the
// given bytes.
func (dm *decMode) NewDecoder(gauge common.MemoryGauge, b []byte) *Decoder {
// NOTE: encoded data is not copied by decoder.
// CCF codec uses CBOR codec under the hood.
return &Decoder{
dec: dm.cborDecMode.NewByteStreamDecoder(b),
gauge: gauge,
dm: dm,
}
}
var defaultDecMode = &decMode{cborDecMode: defaultCBORDecMode}
// Decode returns a Cadence value decoded from its CCF-encoded representation.
//
// This function returns an error if the bytes represent CCF that is malformed,
// invalid, or does not comply with requirements in the CCF specification.
func Decode(gauge common.MemoryGauge, b []byte) (cadence.Value, error) {
return defaultDecMode.Decode(gauge, b)
}
// NewDecoder initializes a Decoder that will decode CCF-encoded bytes from the
// given bytes.
func NewDecoder(gauge common.MemoryGauge, b []byte) *Decoder {
return defaultDecMode.NewDecoder(gauge, b)
}
// Decode reads CCF-encoded bytes and decodes them to a Cadence value.
//
// This function returns an error if the bytes represent CCF that is malformed,
// invalid, or does not comply with requirements in the CCF specification.
func (d *Decoder) Decode() (value cadence.Value, err error) {
// Capture panics that occur during decoding.
defer func() {
// Recover panic error if there is any.
if r := recover(); r != nil {
// Don't recover Go errors, internal errors, or non-errors.
switch r := r.(type) {
case goRuntime.Error, cadenceErrors.InternalError:
panic(r)
case error:
err = r
default:
panic(r)
}
}
// Add context to error if there is any.
if err != nil {
err = cadenceErrors.NewDefaultUserError("ccf: failed to decode: %s", err)
}
}()
// Decode top level message.
tagNum, err := d.dec.DecodeTagNumber()
if err != nil {
return nil, err
}
switch tagNum {
case CBORTagTypeDefAndValue:
// Decode ccf-typedef-and-value-message.
return d.decodeTypeDefAndValue()
case CBORTagTypeAndValue:
// Decode ccf-type-and-value-message.
return d.decodeTypeAndValue(newCadenceTypeByCCFTypeID())
default:
return nil, fmt.Errorf(
"unsupported top level CCF message with CBOR tag number %d",
tagNum,
)
}
}
// decodeTypeDefAndValue decodes encoded ccf-typedef-and-value-message
// without tag number as
// language=CDDL
// ccf-typedef-and-value-message =
//
// ; cbor-tag-typedef-and-value
// #6.129([
// typedef: composite-typedef,
// type-and-value: inline-type-and-value
// ])
func (d *Decoder) decodeTypeDefAndValue() (cadence.Value, error) {
// Decode array head of length 2
err := decodeCBORArrayWithKnownSize(d.dec, 2)
if err != nil {
return nil, err
}
// element 0: typedef
types, err := d.decodeTypeDefs()
if err != nil {
return nil, err
}
// element 1: type and value
val, err := d.decodeTypeAndValue(types)
if err != nil {
return nil, err
}
// Check if there is any unreferenced type definition.
if types.hasUnreferenced() {
return nil, errors.New("found unreferenced type definition")
}
return val, nil
}
// decodeTypeAndValue decodes encoded ccf-type-and-value-message
// without tag number as
// language=CDDL
// ccf-type-and-value-message =
//
// ; cbor-tag-type-and-value
// #6.130(inline-type-and-value)
//
// inline-type-and-value = [
//
// type: inline-type,
// value: value,
//
// ]
func (d *Decoder) decodeTypeAndValue(types *cadenceTypeByCCFTypeID) (cadence.Value, error) {
// Decode array head of length 2.
err := decodeCBORArrayWithKnownSize(d.dec, 2)
if err != nil {
return nil, err
}
// element 0: inline-type
t, err := d.decodeInlineType(types)
if err != nil {
return nil, err
}
// element 1: value
return d.decodeValue(t, types)
}
// decodeValue decodes encoded value of type t.
// language=CDDL
// value =
//
// ccf-type-and-value-message
// / simple-value
// / optional-value
// / array-value
// / dict-value
// / composite-value
// / path-value
// / capability-value
// / inclusiverange-value
// / function-value
// / type-value
//
// ccf-type-and-value-message =
//
// ; cbor-tag-type-and-value
// #6.130([
// type: inline-type,
// value: value
// ])
//
// simple-value =
//
// void-value
// / bool-value
// / character-value
// / string-value
// / address-value
// / uint-value
// / uint8-value
// / uint16-value
// / uint32-value
// / uint64-value
// / uint128-value
// / uint256-value
// / int-value
// / int8-value
// / int16-value
// / int32-value
// / int64-value
// / int128-value
// / int256-value
// / word8-value
// / word16-value
// / word32-value
// / word64-value
// / word128-value
// / word256-value
// / fix64-value
// / ufix64-value
func (d *Decoder) decodeValue(t cadence.Type, types *cadenceTypeByCCFTypeID) (cadence.Value, error) {
if t == nil {
return nil, fmt.Errorf("unexpected nil type")
}
// "Deterministic CCF Encoding Requirements" in CCF specs:
//
// 'inline-type-and-value MUST NOT be used when type can be omitted as described
// in "Cadence Types and Values Encoding".'
// If type t for the value to be decoded is a concrete type (e.g. IntType),
// value MUST NOT be ccf-type-and-value-message.
switch t {
case cadence.VoidType:
return d.decodeVoid()
case cadence.BoolType:
return d.decodeBool()
case cadence.CharacterType:
return d.decodeCharacter()
case cadence.StringType:
return d.decodeString()
case cadence.AddressType:
return d.decodeAddress()
case cadence.IntType:
return d.decodeInt()
case cadence.Int8Type:
return d.decodeInt8()
case cadence.Int16Type:
return d.decodeInt16()
case cadence.Int32Type:
return d.decodeInt32()
case cadence.Int64Type:
return d.decodeInt64()
case cadence.Int128Type:
return d.decodeInt128()
case cadence.Int256Type:
return d.decodeInt256()
case cadence.UIntType:
return d.decodeUInt()
case cadence.UInt8Type:
return d.decodeUInt8()
case cadence.UInt16Type:
return d.decodeUInt16()
case cadence.UInt32Type:
return d.decodeUInt32()
case cadence.UInt64Type:
return d.decodeUInt64()
case cadence.UInt128Type:
return d.decodeUInt128()
case cadence.UInt256Type:
return d.decodeUInt256()
case cadence.Word8Type:
return d.decodeWord8()
case cadence.Word16Type:
return d.decodeWord16()
case cadence.Word32Type:
return d.decodeWord32()
case cadence.Word64Type:
return d.decodeWord64()
case cadence.Word128Type:
return d.decodeWord128()
case cadence.Word256Type:
return d.decodeWord256()
case cadence.Fix64Type:
return d.decodeFix64()
case cadence.Fix128Type:
return d.decodeFix128()
case cadence.UFix64Type:
return d.decodeUFix64()
case cadence.UFix128Type:
return d.decodeUFix128()
case cadence.StoragePathType:
return d.decodePath()
case cadence.PublicPathType:
return d.decodePath()
case cadence.PrivatePathType:
return d.decodePath()
case cadence.MetaType:
// cadenceTypeByCCFTypeID uses a map with CCF type ID as keys.
// CCF type ID can collide if we reuse types (the variable)
// for type values because:
// - CCF type IDs are zero-based for composite TypeValue.
// - CCF type IDs are zero-based for composite type definitions.
typeValue, err := d.decodeNullableTypeValue(newCadenceTypeByCCFTypeID())
if err != nil {
return nil, err
}
return cadence.NewMeteredTypeValue(d.gauge, typeValue), nil
}
switch t := t.(type) {
case *cadence.OptionalType:
return d.decodeOptional(t, types)
case *cadence.VariableSizedArrayType:
return d.decodeArray(t, false, 0, types)
case *cadence.ConstantSizedArrayType:
return d.decodeArray(t, true, uint64(t.Size), types)
case *cadence.DictionaryType:
return d.decodeDictionary(t, types)
case *cadence.ResourceType:
return d.decodeResource(t, types)
case *cadence.StructType:
return d.decodeStruct(t, types)
case *cadence.EventType:
return d.decodeEvent(t, types)
case *cadence.ContractType:
return d.decodeContract(t, types)
case *cadence.CapabilityType:
return d.decodeCapability(t, types)
case *cadence.EnumType:
return d.decodeEnum(t, types)
case *cadence.AttachmentType:
return d.decodeAttachment(t, types)
case *cadence.ReferenceType:
// When static type is a reference type, encoded value is its deferenced type.
return d.decodeValue(t.Type, types)
case *cadence.InclusiveRangeType:
return d.decodeInclusiveRange(t, types)
default:
nt, err := d.dec.NextType()
if err != nil {
return nil, err
}
switch nt {
case cbor.NilType:
// Decode nil value (such as cyclic reference value).
err := d.dec.DecodeNil()
return nil, err
default:
err := decodeCBORTagWithKnownNumber(d.dec, CBORTagTypeAndValue)
if err != nil {
return nil, fmt.Errorf("unexpected encoded value of Cadence type %s (%T): %w", t.ID(), t, err)
}
// Decode ccf-type-and-value-message.
return d.decodeTypeAndValue(types)
}
}
}
// decodeVoid decodes encoded void-value as
// language=CDDL
// void-value = nil
func (d *Decoder) decodeVoid() (cadence.Value, error) {
err := d.dec.DecodeNil()
if err != nil {
return nil, err
}
return cadence.NewMeteredVoid(d.gauge), nil
}
// decodeBool decodes encoded bool-value as
// language=CDDL
// bool-value = bool
func (d *Decoder) decodeBool() (cadence.Value, error) {
b, err := d.dec.DecodeBool()
if err != nil {
return nil, err
}
return cadence.NewMeteredBool(d.gauge, b), nil
}
// decodeCharacter decodes encoded character-value as
// language=CDDL
// character-value = tstr
func (d *Decoder) decodeCharacter() (cadence.Value, error) {
s, err := d.dec.DecodeString()
if err != nil {
return nil, err
}
return cadence.NewMeteredCharacter(
d.gauge,
common.NewCadenceCharacterMemoryUsage(len(s)),
func() string {
return s
})
}
// decodeString decodes encoded string-value as
// language=CDDL
// string-value = tstr
// NOTE: invalid UTF-8 is rejected.
func (d *Decoder) decodeString() (cadence.Value, error) {
s, err := d.dec.DecodeString()
if err != nil {
return nil, err
}
return cadence.NewMeteredString(
d.gauge,
common.NewCadenceStringMemoryUsage(len(s)),
func() string {
return s
},
)
}
// decodeAddress decodes address-value as
// language=CDDL
// address-value = bstr .size 8
func (d *Decoder) decodeAddress() (cadence.Value, error) {
b, err := d.dec.DecodeBytes()
if err != nil {
return nil, err
}
if len(b) != 8 {
return nil, fmt.Errorf("encoded address-value has length %d (expected 8 bytes)", len(b))
}
return cadence.BytesToMeteredAddress(d.gauge, b), nil
}
// decodeInt decodes int-value as
// language=CDDL
// int-value = bigint
func (d *Decoder) decodeInt() (cadence.Value, error) {
bigInt, err := d.dec.DecodeBigInt()
if err != nil {
return nil, err
}
return cadence.NewMeteredIntFromBig(
d.gauge,
common.NewCadenceIntMemoryUsage(
common.BigIntByteLength(bigInt),
),
func() *big.Int {
return bigInt
},
), nil
}
// decodeInt8 decodes int8-value as
// language=CDDL
// int8-value = (int .ge -128) .le 127
func (d *Decoder) decodeInt8() (cadence.Value, error) {
i, err := d.dec.DecodeInt64()
if err != nil {
return nil, err
}
if i < math.MinInt8 || i > math.MaxInt8 {
return nil, fmt.Errorf(
"encoded int8-value %d is outside range of Int8 [%d, %d]",
i,
math.MinInt8,
math.MaxInt8,
)
}
return cadence.NewMeteredInt8(d.gauge, int8(i)), nil
}
// decodeInt16 decodes int16-value as
// language=CDDL
// int16-value = (int .ge -32768) .le 32767
func (d *Decoder) decodeInt16() (cadence.Value, error) {
i, err := d.dec.DecodeInt64()
if err != nil {
return nil, err
}
if i < math.MinInt16 || i > math.MaxInt16 {
return nil, fmt.Errorf(
"encoded int16-value %d is outside range of Int16 [%d, %d]",
i,
math.MinInt16,
math.MaxInt16,
)
}
return cadence.NewMeteredInt16(d.gauge, int16(i)), nil
}
// decodeInt32 decodes int32-value as
// language=CDDL
// int32-value = (int .ge -2147483648) .le 2147483647
func (d *Decoder) decodeInt32() (cadence.Value, error) {
i, err := d.dec.DecodeInt64()
if err != nil {
return nil, err
}
if i < math.MinInt32 || i > math.MaxInt32 {
return nil, fmt.Errorf(
"encoded int32-value %d is outside range of Int32 [%d, %d]",
i,
math.MinInt32,
math.MaxInt32,
)
}
return cadence.NewMeteredInt32(d.gauge, int32(i)), nil
}
// decodeInt64 decodes int64-value as
// language=CDDL
// int64-value = (int .ge -9223372036854775808) .le 9223372036854775807
func (d *Decoder) decodeInt64() (cadence.Value, error) {
i, err := d.dec.DecodeInt64()
if err != nil {
return nil, err
}
return cadence.NewMeteredInt64(d.gauge, i), nil
}
// decodeInt128 decodes int128-value as
// language=CDDL
// int128-value = bigint
func (d *Decoder) decodeInt128() (cadence.Value, error) {
return cadence.NewMeteredInt128FromBig(
d.gauge,
func() *big.Int {
bigInt, err := d.dec.DecodeBigInt()
if err != nil {
panic(fmt.Errorf("failed to decode Int128: %s", err))
}
return bigInt
},
)
}
// decodeInt256 decodes int256-value as
// language=CDDL
// int256-value = bigint
func (d *Decoder) decodeInt256() (cadence.Value, error) {
return cadence.NewMeteredInt256FromBig(
d.gauge,
func() *big.Int {
bigInt, err := d.dec.DecodeBigInt()
if err != nil {
panic(fmt.Errorf("failed to decode Int256: %s", err))
}
return bigInt
},
)
}
// decodeUInt decodes uint-value as
// language=CDDL
// uint-value = bigint .ge 0
func (d *Decoder) decodeUInt() (cadence.Value, error) {
bigInt, err := d.dec.DecodeBigInt()
if err != nil {
return nil, err
}
if bigInt.Sign() < 0 {
return nil, errors.New("encoded uint-value is negative")
}
return cadence.NewMeteredUIntFromBig(
d.gauge,
common.NewCadenceIntMemoryUsage(
common.BigIntByteLength(bigInt),
),
func() *big.Int {
return bigInt
},
)
}
// decodeUInt8 decodes uint8-value as
// language=CDDL
// uint8-value = uint .le 255
func (d *Decoder) decodeUInt8() (cadence.Value, error) {
i, err := d.dec.DecodeUint64()
if err != nil {
return nil, err
}
if i > math.MaxUint8 {
return nil, fmt.Errorf(
"encoded uint8-value %d is outside range of Uint8 [0, %d]",
i,
math.MaxUint8,
)
}
return cadence.NewMeteredUInt8(d.gauge, uint8(i)), nil
}
// decodeUInt16 decodes uint16-value as
// language=CDDL
// uint16-value = uint .le 65535
func (d *Decoder) decodeUInt16() (cadence.Value, error) {
i, err := d.dec.DecodeUint64()
if err != nil {
return nil, err
}
if i > math.MaxUint16 {
return nil, fmt.Errorf(
"encoded uint16-value %d is outside range of Uint16 [0, %d]",
i,
math.MaxUint16,
)
}
return cadence.NewMeteredUInt16(d.gauge, uint16(i)), nil
}
// decodeUInt32 decodes uint32-value as
// language=CDDL
// uint32-value = uint .le 4294967295
func (d *Decoder) decodeUInt32() (cadence.Value, error) {
i, err := d.dec.DecodeUint64()
if err != nil {
return nil, err
}
if i > math.MaxUint32 {
return nil, fmt.Errorf(
"encoded uint32-value %d is outside range of Uint32 [0, %d]",
i,
math.MaxUint32,
)
}
return cadence.NewMeteredUInt32(d.gauge, uint32(i)), nil
}
// decodeUInt64 decodes uint64-value as
// language=CDDL
// uint64-value = uint .le 18446744073709551615
func (d *Decoder) decodeUInt64() (cadence.Value, error) {
i, err := d.dec.DecodeUint64()
if err != nil {
return nil, err
}
return cadence.NewMeteredUInt64(d.gauge, i), nil
}
// decodeUInt128 decodes uint128-value as
// language=CDDL
// uint128-value = bigint .ge 0
func (d *Decoder) decodeUInt128() (cadence.Value, error) {
// NewMeteredUInt128FromBig checks if decoded big.Int is positive.
return cadence.NewMeteredUInt128FromBig(
d.gauge,
func() *big.Int {
bigInt, err := d.dec.DecodeBigInt()
if err != nil {
panic(fmt.Errorf("failed to decode UInt128: %s", err))
}
return bigInt
},
)
}
// decodeUInt256 decodes uint256-value as
// language=CDDL
// uint256-value = bigint .ge 0
func (d *Decoder) decodeUInt256() (cadence.Value, error) {
// NewMeteredUInt256FromBig checks if decoded big.Int is positive.
return cadence.NewMeteredUInt256FromBig(
d.gauge,
func() *big.Int {
bigInt, err := d.dec.DecodeBigInt()
if err != nil {
panic(fmt.Errorf("failed to decode UInt256: %s", err))
}
return bigInt
},
)
}
// decodeWord8 decodes word8-value as
// language=CDDL
// word8-value = uint .le 255
func (d *Decoder) decodeWord8() (cadence.Value, error) {
i, err := d.dec.DecodeUint64()
if err != nil {
return nil, err
}
if i > math.MaxUint8 {
return nil, fmt.Errorf(
"encoded word8-value %d is outside range of Word8 [0, %d]",
i,
math.MaxUint8,
)
}
return cadence.NewMeteredWord8(d.gauge, uint8(i)), nil
}
// decodeWord16 decodes word16-value as
// language=CDDL
// word16-value = uint .le 65535
func (d *Decoder) decodeWord16() (cadence.Value, error) {
i, err := d.dec.DecodeUint64()
if err != nil {
return nil, err
}
if i > math.MaxUint16 {
return nil, fmt.Errorf(
"encoded word16-value %d is outside range of Word16 [0, %d]",
i,
math.MaxUint16,
)
}
return cadence.NewMeteredWord16(d.gauge, uint16(i)), nil
}
// decodeWord32 decodes word32-value as
// language=CDDL
// word32-value = uint .le 4294967295
func (d *Decoder) decodeWord32() (cadence.Value, error) {
i, err := d.dec.DecodeUint64()
if err != nil {
return nil, err
}
if i > math.MaxUint32 {
return nil, fmt.Errorf(
"encoded word32-value %d is outside range of Word32 [0, %d]",
i,
math.MaxUint32,
)
}
return cadence.NewMeteredWord32(d.gauge, uint32(i)), nil
}
// decodeWord64 decodes word64-value as
// language=CDDL
// word64-value = uint .le 18446744073709551615
func (d *Decoder) decodeWord64() (cadence.Value, error) {
i, err := d.dec.DecodeUint64()
if err != nil {
return nil, err
}
return cadence.NewMeteredWord64(d.gauge, i), nil
}
// decodeWord128 decodes word128-value as
// language=CDDL
// word128-value = bigint .ge 0
func (d *Decoder) decodeWord128() (cadence.Value, error) {
// NewMeteredWord128FromBig checks if decoded big.Int is positive.
return cadence.NewMeteredWord128FromBig(
d.gauge,
func() *big.Int {
bigInt, err := d.dec.DecodeBigInt()
if err != nil {
panic(fmt.Errorf("failed to decode Word128: %s", err))
}
return bigInt
},
)
}
// decodeWord256 decodes word256-value as
// language=CDDL
// word256-value = bigint .ge 0
func (d *Decoder) decodeWord256() (cadence.Value, error) {