diff options
Diffstat (limited to 'workhorse/internal/utils/svg/svg.go')
-rw-r--r-- | workhorse/internal/utils/svg/svg.go | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/workhorse/internal/utils/svg/svg.go b/workhorse/internal/utils/svg/svg.go new file mode 100644 index 00000000000..b209cb5bf33 --- /dev/null +++ b/workhorse/internal/utils/svg/svg.go @@ -0,0 +1,42 @@ +// Copyright (c) 2016 Tomas Aparicio. All rights reserved. +// +// Use of this source code is governed by a MIT License +// license that can be found in the LICENSE file or at +// https://github.com/h2non/go-is-svg/blob/master/LICENSE. + +package svg + +import ( + "regexp" + "unicode/utf8" +) + +var ( + htmlCommentRegex = regexp.MustCompile(`(?i)<!--([\s\S]*?)-->`) + svgRegex = regexp.MustCompile(`(?i)^\s*(?:<\?xml[^>]*>\s*)?(?:<!doctype svg[^>]*>\s*)?<svg[^>]*>`) +) + +// isBinary checks if the given buffer is a binary file. +func isBinary(buf []byte) bool { + if len(buf) < 24 { + return false + } + for i := 0; i < 24; i++ { + charCode, _ := utf8.DecodeRuneInString(string(buf[i])) + if charCode == 65533 || charCode <= 8 { + return true + } + } + return false +} + +// Is returns true if the given buffer is a valid SVG image. +func Is(buf []byte) bool { + return !isBinary(buf) && svgRegex.Match(htmlCommentRegex.ReplaceAll(buf, []byte{})) +} + +// IsSVG returns true if the given buffer is a valid SVG image. +// Alias to: Is() +func IsSVG(buf []byte) bool { + return Is(buf) +} |