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49 lines
937 B
Go
49 lines
937 B
Go
package util
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import (
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"bytes"
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"crypto/sha256"
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"io"
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"io/ioutil"
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)
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// Convenience function
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// BufferLength returns the length of a buffer as uint32
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func BufferLength(buf *bytes.Buffer) uint32 {
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return uint32(buf.Len())
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}
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// SumSHA256 returns the sha256 sum of the data
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func SumSHA256(b []byte) []byte {
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h := sha256.New()
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h.Write(b)
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return h.Sum(nil)
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}
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// CalculateHash takes a function with a binary writer and returns
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// the double hash of the io.Writer
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func CalculateHash(f func(bw *BinWriter)) (Uint256, error) {
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buf := new(bytes.Buffer)
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bw := &BinWriter{W: buf}
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f(bw)
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var hash Uint256
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hash = sha256.Sum256(buf.Bytes())
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hash = sha256.Sum256(hash.Bytes())
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return hash, bw.Err
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}
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//ReaderToBuffer converts a io.Reader into a bytes.Buffer
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func ReaderToBuffer(r io.Reader) (*bytes.Buffer, error) {
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byt, err := ioutil.ReadAll(r)
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if err != nil {
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return nil, err
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}
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buf := bytes.NewBuffer(byt)
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return buf, nil
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}
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