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package object
import (
"bytes"
"fmt"
"strconv"
"codeberg.org/lindenii/furgit/oid"
)
// ParseTree decodes a tree object body.
func ParseTree(body []byte, algo oid.Algorithm) (*Tree, error) {
var entries []TreeEntry
i := 0
for i < len(body) {
space := bytes.IndexByte(body[i:], ' ')
if space < 0 {
return nil, fmt.Errorf("object: tree: missing mode terminator")
}
modeBytes := body[i : i+space]
i += space + 1
nul := bytes.IndexByte(body[i:], 0)
if nul < 0 {
return nil, fmt.Errorf("object: tree: missing name terminator")
}
nameBytes := body[i : i+nul]
i += nul + 1
idEnd := i + algo.Size()
if idEnd > len(body) {
return nil, fmt.Errorf("object: tree: truncated child object id")
}
id, err := oid.FromBytes(algo, body[i:idEnd])
if err != nil {
return nil, err
}
i = idEnd
mode, err := strconv.ParseUint(string(modeBytes), 8, 32)
if err != nil {
return nil, fmt.Errorf("object: tree: parse mode: %w", err)
}
entries = append(entries, TreeEntry{
Mode: FileMode(mode),
Name: append([]byte(nil), nameBytes...),
ID: id,
})
}
return &Tree{Entries: entries}, nil
}
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