90 lines
2.4 KiB
Go
90 lines
2.4 KiB
Go
// +build freebsd
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package xattr
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import (
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"syscall"
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)
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const (
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EXTATTR_NAMESPACE_USER = 1
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)
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// Get retrieves extended attribute data associated with path.
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func Get(path, name string) ([]byte, error) {
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// find size.
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size, err := extattr_get_file(path, EXTATTR_NAMESPACE_USER, name, nil, 0)
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if err != nil {
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return nil, &Error{"xattr.Get", path, name, err}
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}
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if size > 0 {
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buf := make([]byte, size)
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// Read into buffer of that size.
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read, err := extattr_get_file(path, EXTATTR_NAMESPACE_USER, name, &buf[0], size)
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if err != nil {
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return nil, &Error{"xattr.Get", path, name, err}
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}
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return buf[:read], nil
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}
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return []byte{}, nil
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}
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// List retrieves a list of names of extended attributes associated
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// with the given path in the file system.
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func List(path string) ([]string, error) {
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// find size.
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size, err := extattr_list_file(path, EXTATTR_NAMESPACE_USER, nil, 0)
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if err != nil {
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return nil, &Error{"xattr.List", path, "", err}
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}
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if size > 0 {
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buf := make([]byte, size)
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// Read into buffer of that size.
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read, err := extattr_list_file(path, EXTATTR_NAMESPACE_USER, &buf[0], size)
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if err != nil {
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return nil, &Error{"xattr.List", path, "", err}
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}
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return attrListToStrings(buf[:read]), nil
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}
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return []string{}, nil
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}
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// Set associates name and data together as an attribute of path.
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func Set(path, name string, data []byte) error {
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var dataval *byte = nil
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datalen := len(data)
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if datalen > 0 {
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dataval = &data[0]
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}
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written, err := extattr_set_file(path, EXTATTR_NAMESPACE_USER, name, dataval, datalen)
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if err != nil {
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return &Error{"xattr.Set", path, name, err}
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}
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if written != datalen {
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return &Error{"xattr.Set", path, name, syscall.E2BIG}
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}
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return nil
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}
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// Remove removes the attribute associated with the given path.
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func Remove(path, name string) error {
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if err := extattr_delete_file(path, EXTATTR_NAMESPACE_USER, name); err != nil {
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return &Error{"xattr.Remove", path, name, err}
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}
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return nil
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}
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// attrListToStrings converts a sequnce of attribute name entries to a []string.
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// Each entry consists of a single byte containing the length
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// of the attribute name, followed by the attribute name.
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// The name is _not_ terminated by NUL.
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func attrListToStrings(buf []byte) []string {
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var result []string
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index := 0
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for index < len(buf) {
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next := index + 1 + int(buf[index])
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result = append(result, string(buf[index+1:next]))
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index = next
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}
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return result
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}
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