114 lines
3.0 KiB
Swift
114 lines
3.0 KiB
Swift
//
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// Copyright 2024 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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//
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import Foundation
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public enum ImageFormat: CustomStringConvertible {
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case png
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case gif
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case tiff
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case jpeg
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case bmp
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case webp
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case heic
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case heif
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public var description: String {
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switch self {
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case .png:
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"ImageFormat_Png"
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case .gif:
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"ImageFormat_Gif"
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case .tiff:
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"ImageFormat_Tiff"
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case .jpeg:
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"ImageFormat_Jpeg"
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case .bmp:
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"ImageFormat_Bmp"
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case .webp:
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"ImageFormat_Webp"
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case .heic:
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"ImageFormat_Heic"
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case .heif:
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"ImageFormat_Heif"
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}
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}
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public var mimeType: MimeType {
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return self.mimeTypes.preferredMimeType
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}
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private var mimeTypes: (preferredMimeType: MimeType, alternativeMimeTypes: [MimeType]) {
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switch self {
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case .png: (.imagePng, [.imageApng, .imageVndMozillaApng])
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case .gif: (.imageGif, [])
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case .tiff: (.imageTiff, [.imageXTiff])
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case .jpeg: (.imageJpeg, [])
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case .bmp: (.imageBmp, [.imageXWindowsBmp])
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case .webp: (.imageWebp, [])
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case .heic: (.imageHeic, [])
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case .heif: (.imageHeif, [])
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}
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}
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public var fileExtension: String {
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// All known ImageFormats must have a corresponding extension.
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return MimeTypeUtil.fileExtensionForMimeType(mimeType.rawValue)!
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}
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internal func isValid(mimeType: String) -> Bool {
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owsAssertDebug(!mimeType.isEmpty)
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let mimeTypes = self.mimeTypes
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return ([mimeTypes.preferredMimeType] + mimeTypes.alternativeMimeTypes).contains(where: {
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return mimeType.caseInsensitiveCompare($0.rawValue) == .orderedSame
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})
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}
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}
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public struct ImageMetadata {
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public let imageFormat: ImageFormat
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public let pixelSize: CGSize
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public let hasAlpha: Bool
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let isAnimated: Bool
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internal init(imageFormat: ImageFormat, pixelSize: CGSize, hasAlpha: Bool, isAnimated: Bool) {
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self.imageFormat = imageFormat
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self.pixelSize = pixelSize
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self.hasAlpha = hasAlpha
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self.isAnimated = isAnimated
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}
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var hasStickerLikeProperties: Bool {
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let maxStickerHeight = CGFloat(512)
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return (
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pixelSize.width <= maxStickerHeight
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&& pixelSize.height <= maxStickerHeight
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&& pixelSize != CGSize(width: 1, height: 1)
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&& hasAlpha
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)
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}
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}
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internal struct WebpMetadata {
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let isValid: Bool
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let canvasWidth: UInt32
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let canvasHeight: UInt32
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let frameCount: UInt32
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}
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public enum ImageMetadataResult {
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/// Source data exceeded size limit for all attachments;
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/// as a precaution no validation was performed.
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case genericSizeLimitExceeded
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/// Exceeded the file size limit for the inferred type of image.
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/// Smaller than the generic size limit.
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case imageTypeSizeLimitExceeded
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case invalid
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case valid(ImageMetadata)
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}
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