mirror of https://github.com/jetkvm/kvm.git
56 lines
843 B
Go
56 lines
843 B
Go
package backend
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import (
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"io"
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"sync"
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)
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type MemoryBackend struct {
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memory []byte
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lock sync.Mutex
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}
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func NewMemoryBackend(memory []byte) *MemoryBackend {
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return &MemoryBackend{memory, sync.Mutex{}}
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}
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func (b *MemoryBackend) ReadAt(p []byte, off int64) (n int, err error) {
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b.lock.Lock()
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if off >= int64(len(b.memory)) {
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return 0, io.EOF
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}
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n = copy(p, b.memory[off:off+int64(len(p))])
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b.lock.Unlock()
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return
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}
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func (b *MemoryBackend) WriteAt(p []byte, off int64) (n int, err error) {
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b.lock.Lock()
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if off >= int64(len(b.memory)) {
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return 0, io.EOF
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}
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n = copy(b.memory[off:off+int64(len(p))], p)
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if n < len(p) {
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return n, io.ErrShortWrite
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}
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b.lock.Unlock()
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return
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}
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func (b *MemoryBackend) Size() (int64, error) {
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return int64(len(b.memory)), nil
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}
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func (b *MemoryBackend) Sync() error {
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return nil
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}
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