mirror of
https://github.com/ethereum/go-ethereum.git
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7f8926e716
We backported branch `extended-tracer` at commit3078dfe80bback to v1.13.5 of Geth. To achieve the backport, we did: - git checkout -b extended-tracer-squashed - git reset --hard3078dfe80b- git reset --mixedfc380f52ef# This was the latest merged commit not from `extended-tracer` branch - git commit -A -m "<This message>" - git checkout v1.13.5 - git checkout -b extended-tracer-backport-v1.13.5 - git cherry-pick extended-tracer-squashed
47 lines
1.6 KiB
Go
47 lines
1.6 KiB
Go
// Copyright 2023 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package directory
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import (
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"errors"
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"fmt"
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"github.com/ethereum/go-ethereum/core/vm"
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)
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const (
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memoryPadLimit = 1024 * 1024
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)
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// GetMemoryCopyPadded returns offset + size as a new slice.
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// It zero-pads the slice if it extends beyond memory bounds.
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func GetMemoryCopyPadded(m *vm.Memory, offset, size int64) ([]byte, error) {
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if offset < 0 || size < 0 {
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return nil, errors.New("offset or size must not be negative")
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}
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if int(offset+size) < m.Len() { // slice fully inside memory
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return m.GetCopy(offset, size), nil
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}
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paddingNeeded := int(offset+size) - m.Len()
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if paddingNeeded > memoryPadLimit {
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return nil, fmt.Errorf("reached limit for padding memory slice: %d", paddingNeeded)
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}
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cpy := make([]byte, size)
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if overlap := int64(m.Len()) - offset; overlap > 0 {
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copy(cpy, m.GetPtr(offset, overlap))
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}
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return cpy, nil
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}
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