Начало декодинга gzip

src/main/java/ru/serega6531/packmate/service/StreamService.java

@@ -1,6 +1,8 @@
 package ru.serega6531.packmate.service;
 
+import com.google.common.primitives.Bytes;
 import lombok.extern.slf4j.Slf4j;
+import org.apache.commons.lang3.ArrayUtils;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.data.domain.PageRequest;
@@ -25,6 +27,8 @@ public class StreamService {
     private final String localIp;
     private final boolean ignoreEmptyPackets;
 
+    private final byte[] GZIP_HEADER = {0x1f, (byte) 0x8b, 0x08};
+
     @Autowired
     public StreamService(StreamRepository repository,
                          PatternService patternService,
@@ -76,6 +80,49 @@ public class StreamService {
             }
         }
 
+        boolean gzipStarted = false;
+        byte[] gzipContent = null;
+        int gzipStartPacket = 0;
+        int gzipEndPacket = 0;
+
+        for (int i = 0; i < packets.size(); i++) {
+            Packet packet = packets.get(i);
+
+            if (packet.isIncoming() && gzipStarted) {
+                gzipStarted = false;
+                gzipEndPacket = i - 1;
+                //TODO end and read gzip stream
+            } else if (!packet.isIncoming()) {
+                String content = new String(packet.getContent());
+
+                int contentPos = content.indexOf("\r\n\r\n");
+                boolean http = content.startsWith("HTTP/");
+
+                if(http && gzipStarted) {
+                    gzipEndPacket = i - 1;
+                    //TODO end and read gzip stream
+                }
+
+                if (contentPos != -1) {   // начало body
+                    String headers = content.substring(0, contentPos);
+                    boolean gziped = headers.contains("Content-Encoding: gzip\r\n");
+                    if (gziped) {
+                        gzipStarted = true;
+                        gzipStartPacket = i;
+                        int gzipStart = Bytes.indexOf(packet.getContent(), GZIP_HEADER);
+                        gzipContent = Arrays.copyOfRange(packet.getContent(), gzipStart, packet.getContent().length);
+                    }
+                } else if (gzipStarted) {  // продолжение body
+                    gzipContent = ArrayUtils.addAll(gzipContent, packet.getContent());
+                }
+            }
+        }
+
+        if(gzipContent != null) {
+            gzipEndPacket = packets.size() - 1;
+            // TODO end and read gzip stream
+        }
+
         Stream savedStream = save(stream);
 
         List<ru.serega6531.packmate.model.Packet> savedPackets = new ArrayList<>();