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Fix AddFile to verify actual bytes read matches declared size (closes #25) #30

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sneak merged 1 commits from fix/issue-25 into next 2026-02-09 01:35:07 +01:00
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1 changed files with 6 additions and 0 deletions
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6
mfer/builder.go
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@ -3,6 +3,7 @@ package mfer
import ( import (
"crypto/sha256" "crypto/sha256"
"errors" "errors"
"fmt"
"io" "io"
"sync" "sync"
"time" "time"
@ -96,6 +97,11 @@ func (b *Builder) AddFile(
} }
} }
// Verify actual bytes read matches declared size
if totalRead != size {
return totalRead, fmt.Errorf("size mismatch for %q: declared %d bytes but read %d bytes", path, size, totalRead)
}
// Encode hash as multihash (SHA2-256) // Encode hash as multihash (SHA2-256)
mh, err := multihash.Encode(h.Sum(nil), multihash.SHA2_256) mh, err := multihash.Encode(h.Sum(nil), multihash.SHA2_256)
if err != nil { if err != nil {