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cid.go
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cid.go
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package check
import (
"bytes"
"fmt"
"io"
"github.com/ipfs/go-cid"
"github.com/ipld/go-car"
"github.com/ipld/go-car/v2/blockstore"
)
func CidSetContains(a, b []cid.Cid) CheckOutput {
s1 := cid.NewSet()
for _, cid := range a {
s1.Add(cid)
}
// for each cid in b, check if it's in a
for _, cid := range b {
if !s1.Has(cid) {
return CheckOutput{
Success: false,
Reason: fmt.Sprintf("missing CID %s", cid),
}
}
}
return CheckOutput{
Success: true,
}
}
func CidSetEquals(a, b []cid.Cid) CheckOutput {
t1 := CidSetContains(a, b)
if !t1.Success {
return t1
}
return CidSetContains(b, a)
}
func CidArrayEquals(a, b []cid.Cid) CheckOutput {
if len(a) != len(b) {
return CheckOutput{
Success: false,
Reason: fmt.Sprintf("length mismatch: %d != %d", len(a), len(b)),
}
}
for i := 0; i < len(a); i++ {
if a[i] != b[i] {
return CheckOutput{
Success: false,
Reason: fmt.Sprintf("mismatch at index %d: %s != %s", i, a[i], b[i]),
}
}
}
return CheckOutput{
Success: true,
}
}
func CidOrderedSubsetContains(a, b []cid.Cid) CheckOutput {
i, j := 0, 0
for i < len(a) && j < len(b) {
if a[i] == b[j] {
i++
j++
continue
}
i++
}
if j != len(b) {
return CheckOutput{
Success: false,
Reason: fmt.Sprintf("missing CID %s", b[j]),
}
}
return CheckOutput{
Success: true,
}
}
func listAllCids(carContent []byte) ([]cid.Cid, error) {
reader := bytes.NewReader(carContent)
cr, err := car.NewCarReader(reader)
if err != nil {
return nil, err
}
// aggregate all blocks, ordered
var gotCIDs []cid.Cid
for {
block, err := cr.Next()
if err == io.EOF {
break
}
if err != nil {
return nil, err
}
gotCIDs = append(gotCIDs, block.Cid())
}
return gotCIDs, nil
}
func listAllRoots(carContent []byte) ([]cid.Cid, error) {
reader := bytes.NewReader(carContent)
bs, err := blockstore.NewReadOnly(reader, nil)
if err != nil {
return nil, err
}
return bs.Roots()
}