43 lines
1.0 KiB
Go
43 lines
1.0 KiB
Go
// Copyright (c) 2016 Tomas Aparicio. All rights reserved.
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//
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// Use of this source code is governed by a MIT License
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// license that can be found in the LICENSE file or at
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// https://github.com/h2non/go-is-svg/blob/master/LICENSE.
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package svg
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import (
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"regexp"
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"unicode/utf8"
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)
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var (
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htmlCommentRegex = regexp.MustCompile(`(?i)<!--([\s\S]*?)-->`)
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svgRegex = regexp.MustCompile(`(?i)^\s*(?:<\?xml[^>]*>\s*)?(?:<!doctype svg[^>]*>\s*)?<svg[^>]*>`)
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)
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// isBinary checks if the given buffer is a binary file.
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func isBinary(buf []byte) bool {
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if len(buf) < 24 {
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return false
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}
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for i := 0; i < 24; i++ {
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charCode, _ := utf8.DecodeRuneInString(string(buf[i]))
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if charCode == 65533 || charCode <= 8 {
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return true
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}
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}
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return false
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}
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// Is returns true if the given buffer is a valid SVG image.
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func Is(buf []byte) bool {
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return !isBinary(buf) && svgRegex.Match(htmlCommentRegex.ReplaceAll(buf, []byte{}))
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}
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// IsSVG returns true if the given buffer is a valid SVG image.
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// Alias to: Is()
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func IsSVG(buf []byte) bool {
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return Is(buf)
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}
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