/// <inheritdoc />
internal override HandleResult OnReceive <TSender>(TSender sender, IntPtr connId, byte[] data, ParseRequestBody <TSender, TRequestBodyType> parseRequestBody)
{
var cache = _dataReceiveAdapterCache.Get(connId);
if (cache == null)
{
return(HandleResult.Error);
}
cache.Data.AddRange(data);
if (cache.Data.Count > data.Length)
{
data = cache.Data.ToArray();
}
// 在data中搜索terminator
var findList = _boyerMoore.SearchAll(data);
if (findList.Count == 0)
{
// 没找到等下次
return(HandleResult.Ok);
}
// 终止符长度
var terminatorLength = _boyerMoore.PatternLength;
// 最后位置
var lastPosition = 0;
foreach (var index in findList)
{
// 数量
var bodyLength = index - lastPosition;
// 得到一条完整数据包
var bodyData = cache.Data.GetRange(lastPosition, bodyLength).ToArray();
// 记录最后位置
lastPosition += bodyLength + terminatorLength;
// 包体解析对象从适配器子类中获取
var obj = ParseRequestBody(bodyData);
// 调用解析请求包体事件
if (parseRequestBody.Invoke(sender, connId, obj) == HandleResult.Error)
{
return(HandleResult.Error);
}
}
if (lastPosition > 0)
{
// 清除已使用缓存
cache.Data.RemoveRange(0, lastPosition);
}
return(HandleResult.Ignore);
}
private static int GetEndOfJpeg(byte[] fileBytes, int indexOfMp4, out BoyerMoore bm)
{
var endOfJpegBytes = MovingPhotoExtraction.ToBytes("FF D9".Split(' '));
bm = new BoyerMoore(endOfJpegBytes);
var subBytes = fileBytes.Take(indexOfMp4).ToArray();
var endOfJpegList = bm.SearchAll(subBytes);
return(endOfJpegList.LastOrDefault());
}
static void Main()
{
string _keyWord = "hey";
byte[] _byteKeyWord = Encoding.ASCII.GetBytes(_keyWord);
string _context = "Lo hey hey rem ipsum dolor sit amet, consectetur adipiscing elit. Fusce et varius nisi";
byte[] _byteContext = Encoding.ASCII.GetBytes(_context);
BoyerMoore boyerMoore = new BoyerMoore()
.SetPattern(_byteKeyWord)
.SetSearchArray(_byteContext);
List <int> _findList = boyerMoore.SearchAll();
Console.WriteLine("Points of entitites:");
foreach (var item in _findList)
{
Console.WriteLine(item);
}
Console.WriteLine("Number of find words: " + boyerMoore.count());
Console.WriteLine("Long random prime: " + longRandomPrime());
}
public static bool Read(string file, List <byte[]> byteSearch)
{
//var r1 = new ExifLib.ExifReader(file);
//var m1 = MetadataExtractor.ImageMetadataReader.ReadMetadata(file);
Console.Write("Searching " + file);
var fileBytes = System.IO.File.ReadAllBytes(file);
int indexOfMp4 = -1;
foreach (var search in byteSearch)
{
indexOfMp4 = new BoyerMoore(search).Search(fileBytes);
if (indexOfMp4 >= 0)
{
break;
}
}
if (indexOfMp4 >= 0)
{
Console.WriteLine(" Found the video");
WriteVideo(file, fileBytes, indexOfMp4);
return(true);
}
else
{
Console.Write(" Did not find known video, trying generic approach");
// http://dev.exiv2.org/projects/exiv2/wiki/The_Metadata_in_JPEG_files says that a JPEG start of image with 0xFFD8 and ends with 0xFFD9.
var endOfJpeg = MovingPhotoExtraction.ToBytes("FF D9".Split(' '));
var indexOfMp4_Part1 = MovingPhotoExtraction.ToBytes("00 00 00".Split(' '));
var indexOfMp4_Part2 = MovingPhotoExtraction.ToBytes("66 74 79 70".Split(' '));
var indexOfMp4_Part3 = MovingPhotoExtraction.ToBytes("6D 70 34 32".Split(' '));
var bm = new BoyerMoore(endOfJpeg);
var endOf = bm.Search(fileBytes);
bm.SetPattern(indexOfMp4_Part2);
var part2s = bm.SearchAll(fileBytes);
bm.SetPattern(indexOfMp4_Part3);
foreach (var part2 in part2s)
{
if (part2 < endOf)
{
Console.Write("Not yet at end of jpeg");
}
var part3 = bm.SearchAll(fileBytes).FirstOrDefault(a => a > part2);
// part 3 is just a bit further than part2
if (part3 > part2 && part2 + 20 > part3)
{
var minus4 = fileBytes[part2 - 4];
var minus3 = fileBytes[part2 - 3];
var minus2 = fileBytes[part2 - 2];
var minus1 = fileBytes[part2 - 1];
if (minus4 == 0 && minus3 == 0 && minus2 == 0)
{
Console.WriteLine("... Found video via pattern search");
WriteVideo(file, fileBytes, part2 - 4);
return(true);
}
Console.WriteLine($"... Found part2 and 3, not 1: {minus4} {minus3} {minus2} {minus1}");
}
}
Console.WriteLine($"Failed to find the video out of {part2s.Count} possibilites");
Console.WriteLine("Please report this output to https://github.com/cliveontoast/GoMoPho/issues and attach your moving image jpeg file");
}
return(false);
}
