fix length is 0

QGVAPlayer.podspec

@@ -16,7 +16,7 @@ Pod::Spec.new do |spec|
   #
 
   spec.name         = "QGVAPlayer"
-  spec.version      = "1.0.18"
+  spec.version      = "1.0.19"
   spec.summary      = "video animation player."
   spec.platform     = :ios, "8.0"
 

iOS/CHANGELOG.md

@@ -1,3 +1,9 @@
+## iOS 1.0.19
+
+**bugfix**
+
+- 修复mp4解析length为0异常。
+
 ## iOS 1.0.18
 
 **bugfix**

iOS/QGVAPlayer/QGVAPlayer/Classes/MP4Parser/QGMP4Parser.m

@@ -143,6 +143,10 @@
       }
       bytes = data.bytes;
       *length = [self readValue:bytes length:kQGBoxLargeSizeLengthInBytes];
+      if (*length == 0) {
+        VAP_Error(kQGVAPModuleCommon, @"read box length is 0");
+        return NO;
+      }
     }
     return YES;
 }
@@ -182,6 +186,7 @@
     for (int i = 0; i < length; i++) {
         value += (bytes[i]&0xff)<<((length-i-1)*8);
     }
+    VAP_Debug(kQGVAPModuleCommon, @"readValue length:%lld value:%lld", length, value);
     return value;
 }