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rlp.go
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rlp.go
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/*
* Cadence - The resource-oriented smart contract programming language
*
* Copyright Dapper Labs, Inc.
*
* 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 stdlib
import (
"fmt"
"github.com/onflow/cadence/runtime/common"
"github.com/onflow/cadence/runtime/errors"
"github.com/onflow/cadence/runtime/interpreter"
"github.com/onflow/cadence/runtime/sema"
"github.com/onflow/cadence/runtime/stdlib/rlp"
)
var rlpContractType = func() *sema.CompositeType {
ty := &sema.CompositeType{
Identifier: "RLP",
Kind: common.CompositeKindContract,
}
ty.Members = sema.MembersAsMap([]*sema.Member{
sema.NewUnmeteredPublicFunctionMember(
ty,
rlpDecodeListFunctionName,
rlpDecodeListFunctionType,
rlpDecodeListFunctionDocString,
),
sema.NewUnmeteredPublicFunctionMember(
ty,
rlpDecodeStringFunctionName,
rlpDecodeStringFunctionType,
rlpDecodeStringFunctionDocString,
),
})
return ty
}()
var rlpContractStaticType interpreter.StaticType = interpreter.ConvertSemaCompositeTypeToStaticCompositeType(
nil,
rlpContractType,
)
const rlpErrMsgInputContainsExtraBytes = "input data is expected to be RLP-encoded of a single string or a single list but it seems it contains extra trailing bytes."
const rlpDecodeStringFunctionDocString = `
Decodes an RLP-encoded byte array (called string in the context of RLP).
The byte array should only contain of a single encoded value for a string;
if the encoded value type does not match, or it has trailing unnecessary bytes, the program aborts.
If any error is encountered while decoding, the program aborts.
`
const rlpDecodeStringFunctionName = "decodeString"
var rlpDecodeStringFunctionType = &sema.FunctionType{
Parameters: []sema.Parameter{
{
Label: sema.ArgumentLabelNotRequired,
Identifier: "input",
TypeAnnotation: sema.NewTypeAnnotation(
sema.ByteArrayType,
),
},
},
ReturnTypeAnnotation: sema.NewTypeAnnotation(
sema.ByteArrayType,
),
}
type RLPDecodeStringError struct {
interpreter.LocationRange
Msg string
}
var _ errors.UserError = RLPDecodeStringError{}
func (RLPDecodeStringError) IsUserError() {}
func (e RLPDecodeStringError) Error() string {
return fmt.Sprintf("failed to RLP-decode string: %s", e.Msg)
}
var rlpDecodeStringFunction = interpreter.NewUnmeteredHostFunctionValue(
rlpDecodeStringFunctionType,
func(invocation interpreter.Invocation) interpreter.Value {
input, ok := invocation.Arguments[0].(*interpreter.ArrayValue)
if !ok {
panic(errors.NewUnreachableError())
}
invocation.Interpreter.ReportComputation(common.ComputationKindSTDLIBRLPDecodeString, uint(input.Count()))
locationRange := invocation.LocationRange
convertedInput, err := interpreter.ByteArrayValueToByteSlice(invocation.Interpreter, input, locationRange)
if err != nil {
panic(RLPDecodeStringError{
Msg: err.Error(),
LocationRange: locationRange,
})
}
output, bytesRead, err := rlp.DecodeString(convertedInput, 0)
if err != nil {
panic(RLPDecodeStringError{
Msg: err.Error(),
LocationRange: locationRange,
})
}
if bytesRead != len(convertedInput) {
panic(RLPDecodeStringError{
Msg: rlpErrMsgInputContainsExtraBytes,
LocationRange: locationRange,
})
}
return interpreter.ByteSliceToByteArrayValue(invocation.Interpreter, output)
},
)
const rlpDecodeListFunctionDocString = `
Decodes an RLP-encoded list into an array of RLP-encoded items.
Note that this function does not recursively decode, so each element of the resulting array is RLP-encoded data.
The byte array should only contain of a single encoded value for a list;
if the encoded value type does not match, or it has trailing unnecessary bytes, the program aborts.
If any error is encountered while decoding, the program aborts.
`
const rlpDecodeListFunctionName = "decodeList"
var rlpDecodeListFunctionType = &sema.FunctionType{
Parameters: []sema.Parameter{
{
Label: sema.ArgumentLabelNotRequired,
Identifier: "input",
TypeAnnotation: sema.NewTypeAnnotation(
sema.ByteArrayType,
),
},
},
ReturnTypeAnnotation: sema.NewTypeAnnotation(
sema.ByteArrayArrayType,
),
}
type RLPDecodeListError struct {
interpreter.LocationRange
Msg string
}
var _ errors.UserError = RLPDecodeListError{}
func (RLPDecodeListError) IsUserError() {}
func (e RLPDecodeListError) Error() string {
return fmt.Sprintf("failed to RLP-decode list: %s", e.Msg)
}
var rlpDecodeListFunction = interpreter.NewUnmeteredHostFunctionValue(
rlpDecodeListFunctionType,
func(invocation interpreter.Invocation) interpreter.Value {
input, ok := invocation.Arguments[0].(*interpreter.ArrayValue)
if !ok {
panic(errors.NewUnreachableError())
}
invocation.Interpreter.ReportComputation(common.ComputationKindSTDLIBRLPDecodeList, uint(input.Count()))
locationRange := invocation.LocationRange
convertedInput, err := interpreter.ByteArrayValueToByteSlice(invocation.Interpreter, input, locationRange)
if err != nil {
panic(RLPDecodeListError{
Msg: err.Error(),
LocationRange: locationRange,
})
}
output, bytesRead, err := rlp.DecodeList(convertedInput, 0)
if err != nil {
panic(RLPDecodeListError{
Msg: err.Error(),
LocationRange: locationRange,
})
}
if bytesRead != len(convertedInput) {
panic(RLPDecodeListError{
Msg: rlpErrMsgInputContainsExtraBytes,
LocationRange: locationRange,
})
}
values := make([]interpreter.Value, len(output))
for i, b := range output {
values[i] = interpreter.ByteSliceToByteArrayValue(invocation.Interpreter, b)
}
return interpreter.NewArrayValue(
invocation.Interpreter,
locationRange,
interpreter.NewVariableSizedStaticType(
invocation.Interpreter,
interpreter.ByteArrayStaticType,
),
common.ZeroAddress,
values...,
)
},
)
var rlpContractFields = map[string]interpreter.Value{
rlpDecodeListFunctionName: rlpDecodeListFunction,
rlpDecodeStringFunctionName: rlpDecodeStringFunction,
}
var rlpContractValue = interpreter.NewSimpleCompositeValue(
nil,
rlpContractType.ID(),
rlpContractStaticType,
nil,
rlpContractFields,
nil,
nil,
nil,
)
var RLPContract = StandardLibraryValue{
Name: "RLP",
Type: rlpContractType,
Value: rlpContractValue,
Kind: common.DeclarationKindContract,
}