43 lines
703 B
Go
43 lines
703 B
Go
package fs
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import (
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"io"
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"io/fs"
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)
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func ReadFile(fsys fs.FS, name string) ([]byte, error) {
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if fsys, ok := fsys.(fs.ReadFileFS); ok {
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return fsys.ReadFile(name)
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}
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file, err := fsys.Open(name)
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if err != nil {
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return nil, err
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}
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var size int
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if info, err := file.Stat(); err == nil {
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size64 := info.Size()
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if int64(int(size64)) == size64 {
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size = int(size64)
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}
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}
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data := make([]byte, 0, size+1)
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for {
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if len(data) >= cap(data) {
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d := append(data[:cap(data)], 0)
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data = d[:len(data)]
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}
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n, err := file.Read(data[len(data):cap(data)])
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data = data[:len(data)+n]
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if err != nil {
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if err == io.EOF {
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err = nil
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}
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file.Close()
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return data, err
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}
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}
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}
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