mirror of
https://github.com/Swiftgram/Telegram-iOS.git
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407 lines
14 KiB
Swift
407 lines
14 KiB
Swift
import Foundation
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import UIKit
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import SwiftSignalKit
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import CryptoUtils
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import ManagedFile
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public final class AnimationCacheItemFrame {
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public enum Format {
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case rgba(width: Int, height: Int, bytesPerRow: Int)
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}
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public let data: Data
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public let range: Range<Int>
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public let format: Format
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public let duration: Double
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public init(data: Data, range: Range<Int>, format: Format, duration: Double) {
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self.data = data
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self.range = range
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self.format = format
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self.duration = duration
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}
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}
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public final class AnimationCacheItem {
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public let numFrames: Int
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private let getFrameImpl: (Int) -> AnimationCacheItemFrame?
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public init(numFrames: Int, getFrame: @escaping (Int) -> AnimationCacheItemFrame?) {
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self.numFrames = numFrames
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self.getFrameImpl = getFrame
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}
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public func getFrame(index: Int) -> AnimationCacheItemFrame? {
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return self.getFrameImpl(index)
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}
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}
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public protocol AnimationCacheItemWriter: AnyObject {
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func add(bytes: UnsafeRawPointer, length: Int, width: Int, height: Int, bytesPerRow: Int, duration: Double)
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func finish()
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}
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public protocol AnimationCache: AnyObject {
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func get(sourceId: String, fetch: @escaping (AnimationCacheItemWriter) -> Disposable) -> Signal<AnimationCacheItem?, NoError>
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}
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private func md5Hash(_ string: String) -> String {
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let hashData = string.data(using: .utf8)!.withUnsafeBytes { bytes -> Data in
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return CryptoMD5(bytes.baseAddress!, Int32(bytes.count))
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}
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return hashData.withUnsafeBytes { bytes -> String in
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let uintBytes = bytes.baseAddress!.assumingMemoryBound(to: UInt8.self)
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return String(format: "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", uintBytes[0], uintBytes[1], uintBytes[2], uintBytes[3], uintBytes[4], uintBytes[5], uintBytes[6], uintBytes[7], uintBytes[8], uintBytes[9], uintBytes[10], uintBytes[11], uintBytes[12], uintBytes[13], uintBytes[14], uintBytes[15])
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}
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}
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private func itemSubpath(hashString: String) -> (directory: String, fileName: String) {
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assert(hashString.count == 32)
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var directory = ""
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for i in 0 ..< 1 {
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if !directory.isEmpty {
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directory.append("/")
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}
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directory.append(String(hashString[hashString.index(hashString.startIndex, offsetBy: i * 2) ..< hashString.index(hashString.startIndex, offsetBy: (i + 1) * 2)]))
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}
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return (directory, hashString)
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}
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private final class AnimationCacheItemWriterImpl: AnimationCacheItemWriter {
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private struct ParameterSet: Equatable {
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var width: Int
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var height: Int
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var bytesPerRow: Int
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}
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private struct FrameMetadata {
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var offset: Int
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var length: Int
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var duration: Double
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}
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private let file: ManagedFile
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private let completion: (Bool) -> Void
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private var currentParameterSet: ParameterSet?
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private var contentLengthOffset: Int?
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private var isFailed: Bool = false
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private var isFinished: Bool = false
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private var frames: [FrameMetadata] = []
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private var contentLength: Int = 0
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private let lock = Lock()
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init?(tempPath: String, completion: @escaping (Bool) -> Void) {
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guard let file = ManagedFile(queue: nil, path: tempPath, mode: .readwrite) else {
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return nil
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}
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self.file = file
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self.completion = completion
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}
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func add(bytes: UnsafeRawPointer, length: Int, width: Int, height: Int, bytesPerRow: Int, duration: Double) {
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self.lock.locked {
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if self.isFailed {
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return
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}
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let parameterSet = ParameterSet(width: width, height: height, bytesPerRow: bytesPerRow)
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if let currentParameterSet = self.currentParameterSet {
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if currentParameterSet != parameterSet {
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self.isFailed = true
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return
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}
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} else {
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self.currentParameterSet = parameterSet
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self.file.write(1 as UInt32)
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self.file.write(UInt32(parameterSet.width))
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self.file.write(UInt32(parameterSet.height))
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self.file.write(UInt32(parameterSet.bytesPerRow))
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self.contentLengthOffset = Int(self.file.position())
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self.file.write(0 as UInt32)
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}
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self.frames.append(FrameMetadata(offset: Int(self.file.position()), length: length, duration: duration))
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let _ = self.file.write(bytes, count: length)
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self.contentLength += length
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}
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}
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func finish() {
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var shouldComplete = false
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self.lock.locked {
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if !self.isFinished {
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self.isFinished = true
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shouldComplete = true
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guard let contentLengthOffset = self.contentLengthOffset else {
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self.isFailed = true
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return
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}
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let metadataPosition = self.file.position()
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self.file.seek(position: Int64(contentLengthOffset))
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self.file.write(UInt32(self.contentLength))
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self.file.seek(position: metadataPosition)
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self.file.write(UInt32(self.frames.count))
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for frame in self.frames {
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self.file.write(UInt32(frame.offset))
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self.file.write(UInt32(frame.length))
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self.file.write(Float32(frame.duration))
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}
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}
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}
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if shouldComplete {
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self.completion(!self.isFailed)
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}
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}
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}
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private final class AnimationCacheItemAccessor {
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struct FrameInfo {
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let range: Range<Int>
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let duration: Double
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}
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private let data: Data
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private let frameMapping: [Int: FrameInfo]
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private let format: AnimationCacheItemFrame.Format
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init(data: Data, frameMapping: [Int: FrameInfo], format: AnimationCacheItemFrame.Format) {
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self.data = data
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self.frameMapping = frameMapping
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self.format = format
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}
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func getFrame(index: Int) -> AnimationCacheItemFrame? {
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guard let frameInfo = self.frameMapping[index] else {
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return nil
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}
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return AnimationCacheItemFrame(data: data, range: frameInfo.range, format: self.format, duration: frameInfo.duration)
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}
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}
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private func readUInt32(data: Data, offset: Int) -> UInt32 {
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var value: UInt32 = 0
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withUnsafeMutableBytes(of: &value, { bytes -> Void in
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data.withUnsafeBytes { dataBytes -> Void in
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memcpy(bytes.baseAddress!, dataBytes.baseAddress!.advanced(by: offset), 4)
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}
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})
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return value
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}
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private func loadItem(path: String) -> AnimationCacheItem? {
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guard let data = try? Data(contentsOf: URL(fileURLWithPath: path), options: .alwaysMapped) else {
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return nil
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}
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let dataLength = data.count
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var offset = 0
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guard dataLength >= offset + 4 else {
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return nil
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}
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let formatVersion = readUInt32(data: data, offset: offset)
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offset += 4
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if formatVersion != 1 {
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return nil
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}
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guard dataLength >= offset + 4 else {
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return nil
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}
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let width = readUInt32(data: data, offset: offset)
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offset += 4
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guard dataLength >= offset + 4 else {
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return nil
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}
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let height = readUInt32(data: data, offset: offset)
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offset += 4
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guard dataLength >= offset + 4 else {
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return nil
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}
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let bytesPerRow = readUInt32(data: data, offset: offset)
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offset += 4
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guard dataLength >= offset + 4 else {
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return nil
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}
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let frameDataLength = readUInt32(data: data, offset: offset)
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offset += 4
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offset += Int(frameDataLength)
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guard dataLength >= offset + 4 else {
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return nil
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}
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let numFrames = readUInt32(data: data, offset: offset)
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offset += 4
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var frameMapping: [Int: AnimationCacheItemAccessor.FrameInfo] = [:]
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for i in 0 ..< Int(numFrames) {
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guard dataLength >= offset + 4 + 4 + 4 else {
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return nil
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}
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let frameStart = readUInt32(data: data, offset: offset)
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offset += 4
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let frameLength = readUInt32(data: data, offset: offset)
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offset += 4
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let frameDuration = readUInt32(data: data, offset: offset)
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offset += 4
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frameMapping[i] = AnimationCacheItemAccessor.FrameInfo(range: Int(frameStart) ..< Int(frameStart + frameLength), duration: Double(frameDuration))
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}
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let itemAccessor = AnimationCacheItemAccessor(data: data, frameMapping: frameMapping, format: .rgba(width: Int(width), height: Int(height), bytesPerRow: Int(bytesPerRow)))
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return AnimationCacheItem(numFrames: Int(numFrames), getFrame: { index in
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return itemAccessor.getFrame(index: index)
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})
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}
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public final class AnimationCacheImpl: AnimationCache {
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private final class Impl {
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private final class ItemContext {
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let subscribers = Bag<(AnimationCacheItem?) -> Void>()
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let disposable = MetaDisposable()
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deinit {
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self.disposable.dispose()
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}
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}
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private let queue: Queue
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private let basePath: String
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private let allocateTempFile: () -> String
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private var itemContexts: [String: ItemContext] = [:]
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init(queue: Queue, basePath: String, allocateTempFile: @escaping () -> String) {
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self.queue = queue
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self.basePath = basePath
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self.allocateTempFile = allocateTempFile
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}
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deinit {
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}
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func get(sourceId: String, fetch: @escaping (AnimationCacheItemWriter) -> Disposable, completion: @escaping (AnimationCacheItem?) -> Void) -> Disposable {
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let sourceIdPath = itemSubpath(hashString: md5Hash(sourceId))
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let itemDirectoryPath = "\(self.basePath)/\(sourceIdPath.directory)"
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let itemPath = "\(itemDirectoryPath)/\(sourceIdPath.fileName)"
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if FileManager.default.fileExists(atPath: itemPath) {
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completion(loadItem(path: itemPath))
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return EmptyDisposable
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}
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let itemContext: ItemContext
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var beginFetch = false
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if let current = self.itemContexts[sourceId] {
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itemContext = current
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} else {
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itemContext = ItemContext()
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self.itemContexts[sourceId] = itemContext
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beginFetch = true
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}
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let queue = self.queue
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let index = itemContext.subscribers.add(completion)
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if beginFetch {
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let tempPath = self.allocateTempFile()
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guard let writer = AnimationCacheItemWriterImpl(tempPath: tempPath, completion: { [weak self, weak itemContext] success in
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queue.async {
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guard let strongSelf = self, let itemContext = itemContext, itemContext === strongSelf.itemContexts[sourceId] else {
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return
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}
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strongSelf.itemContexts.removeValue(forKey: sourceId)
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guard success else {
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return
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}
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guard let _ = try? FileManager.default.createDirectory(at: URL(fileURLWithPath: itemDirectoryPath), withIntermediateDirectories: true, attributes: nil) else {
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return
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}
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guard let _ = try? FileManager.default.moveItem(atPath: tempPath, toPath: itemPath) else {
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return
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}
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guard let item = loadItem(path: itemPath) else {
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return
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}
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for f in itemContext.subscribers.copyItems() {
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f(item)
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}
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}
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}) else {
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return EmptyDisposable
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}
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let fetchDisposable = fetch(writer)
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itemContext.disposable.set(ActionDisposable {
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fetchDisposable.dispose()
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})
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}
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return ActionDisposable { [weak self, weak itemContext] in
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queue.async {
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guard let strongSelf = self, let itemContext = itemContext, itemContext === strongSelf.itemContexts[sourceId] else {
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return
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}
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itemContext.subscribers.remove(index)
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if itemContext.subscribers.isEmpty {
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itemContext.disposable.dispose()
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strongSelf.itemContexts.removeValue(forKey: sourceId)
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}
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}
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}
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}
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}
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private let queue: Queue
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private let impl: QueueLocalObject<Impl>
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public init(basePath: String, allocateTempFile: @escaping () -> String) {
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let queue = Queue()
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self.queue = queue
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self.impl = QueueLocalObject(queue: queue, generate: {
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return Impl(queue: queue, basePath: basePath, allocateTempFile: allocateTempFile)
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})
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}
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public func get(sourceId: String, fetch: @escaping (AnimationCacheItemWriter) -> Disposable) -> Signal<AnimationCacheItem?, NoError> {
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return Signal { subscriber in
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let disposable = MetaDisposable()
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self.impl.with { impl in
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disposable.set(impl.get(sourceId: sourceId, fetch: fetch, completion: { result in
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subscriber.putNext(result)
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subscriber.putCompletion()
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}))
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}
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return disposable
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}
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|> runOn(self.queue)
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}
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}
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