mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2025-11-03 23:12:26 -06:00
43 lines
1.4 KiB
Go
43 lines
1.4 KiB
Go
|
// GoToSocial
|
||
|
|
// Copyright (C) GoToSocial Authors admin@gotosocial.org
|
||
|
|
// SPDX-License-Identifier: AGPL-3.0-or-later
|
||
|
|
//
|
||
|
|
// This program is free software: you can redistribute it and/or modify
|
||
|
|
// it under the terms of the GNU Affero General Public License as published by
|
||
|
|
// the Free Software Foundation, either version 3 of the License, or
|
||
|
|
// (at your option) any later version.
|
||
|
|
//
|
||
|
|
// This program is distributed in the hope that it will be useful,
|
||
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
// GNU Affero General Public License for more details.
|
||
|
|
//
|
||
|
|
// You should have received a copy of the GNU Affero General Public License
|
||
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
|
||
|
|
package media
|
||
|
|
|
||
|
|
// newHdrBuf returns a buffer of suitable size to
|
||
|
|
// read bytes from a file header or magic number.
|
||
|
|
//
|
||
|
|
// File header is *USUALLY* 261 bytes at the start
|
||
|
|
// of a file; magic number can be much less than
|
||
|
|
// that (just a few bytes).
|
||
|
|
//
|
||
|
|
// To cover both cases, this function returns a buffer
|
||
|
|
// suitable for whichever is smallest: the first 261
|
||
|
|
// bytes of the file, or the whole file.
|
||
|
|
//
|
||
|
|
// See:
|
||
|
|
//
|
||
|
|
// - https://en.wikipedia.org/wiki/File_format#File_header
|
||
|
|
// - https://github.com/h2non/filetype.
|
||
|
|
func newHdrBuf(fileSize int) []byte {
|
||
|
|
bufSize := 261
|
||
|
|
if fileSize > 0 && fileSize < bufSize {
|
||
|
|
bufSize = fileSize
|
||
|
|
}
|
||
|
|
|
||
|
|
return make([]byte, bufSize)
|
||
|
|
}
|