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package main
import (
"crypto/sha256"
"encoding/json"
"fmt"
"os"
ct "github.com/google/certificate-transparency-go"
)
type treeHead struct {
TreeSize int64 `json:"tree_size"`
RootHash [sha256.Size]byte `json:root_hash"`
}
func readState(opts options, logID []byte) (treeHead, error) {
if _, err := os.Stat(fmt.Sprintf("%s/%x/%s", opts.logDirectory, logID, opts.stateFile)); err != nil {
return treeHead{0, sha256.Sum256(nil)}, nil
}
b, err := os.ReadFile(fmt.Sprintf("%s/%x/%s", opts.logDirectory, logID, opts.stateFile))
if err != nil {
return treeHead{}, err
}
var th treeHead
if err := json.Unmarshal(b, &th); err != nil {
return treeHead{}, err
}
return th, nil
}
func readSnapshot(opts options, logID []byte) (ct.SignedTreeHead, error) {
b, err := os.ReadFile(fmt.Sprintf("%s/%x/%s", opts.logDirectory, logID, opts.sthFile))
if err != nil {
return ct.SignedTreeHead{}, err
}
var sth ct.SignedTreeHead
if err := json.Unmarshal(b, &sth); err != nil {
return ct.SignedTreeHead{}, err
}
return sth, nil
}
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