/
reader.go
83 lines (71 loc) · 1.57 KB
/
reader.go
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package common
import (
"github.com/btcsuite/btcd/chaincfg/chainhash"
"io"
"os"
"strings"
)
func readHashFromFidx(filename string) ([]*chainhash.Hash, error) {
file, err := os.Open(filename)
if err != nil {
return nil, err
}
defer file.Close()
// Skip the first 4096 bytes
if _, err := file.Seek(4096, 0); err != nil {
return nil, err
}
var data []*chainhash.Hash
buffer := make([]byte, 32)
// Read the rest of the file in 32-byte pieces and store them in an array
for {
bytesRead, err := file.Read(buffer)
if err != nil && err != io.EOF {
return nil, err
}
if bytesRead < 32 {
break
}
h, err := chainhash.NewHash(buffer)
if err != nil {
return nil, err
}
data = append(data, h)
}
return data, nil
}
func readHashFromDidx(filename string) ([]*chainhash.Hash, error) {
file, err := os.Open(filename)
if err != nil {
return nil, err
}
defer file.Close()
// Skip the first 4096 bytes
if _, err := file.Seek(4096, 0); err != nil {
return nil, err
}
var data []*chainhash.Hash
buffer := make([]byte, 40) // 8+32
// Read the rest of the file in 40-byte pieces and store them in an array
for {
bytesRead, err := file.Read(buffer)
if err != nil && err != io.EOF {
return nil, err
}
if bytesRead < 40 {
break
}
h, err := chainhash.NewHash(buffer[8:])
if err != nil {
return nil, err
}
data = append(data, h)
}
return data, nil
}
func ReadHashFromFile(filename string) ([]*chainhash.Hash, error) {
if strings.HasSuffix(filename, "fidx") {
return readHashFromFidx(filename)
}
return readHashFromDidx(filename)
}