增加Android平台的资产管理器AssetManager以及文件输入流

inc/hgl/filesystem/AssetManage.h

@@ -0,0 +1,9 @@
+#ifndef HGL_FILESYSTEM_ASSET_MANAGE_INCLUDE
+#define HGL_FILESYSTEM_ASSET_MANAGE_INCLUDE
+
+#include<hgl/type/BaseString.h>
+namespace hgl
+{
+
+}//namespace hgl
+#endif//HGL_FILESYSTEM_ASSET_MANAGE_INCLUDE

src/Platform/Android/AssetManage.cpp

@@ -0,0 +1,109 @@
+#include<hgl/filesystem/AssetManage.h>
+#include<hgl/io/InputStream.h>
+#include<android/asset_manager.h>
+#include<android/asset_manager_jni.h>
+
+namespace hgl
+{
+    namespace
+    {
+        static AAssetManager *asset_manager=nullptr;
+
+        class AndroidAssetInputStream:public io::InputStream
+        {
+            AAsset *asset;
+
+        public:
+
+            AndroidAssetInputStream(AAsset *a)
+            {
+                asset=a;
+            }
+
+            ~AndroidAssetInputStream()
+            {
+                Close();
+            }
+
+            void    Close() override
+            {
+                if(!asset)return;
+
+                AAsset_close(asset);
+                asset=nullptr;
+            }
+
+            int64   Read(void *data,int64 size) override
+            {
+                return AAsset_read(asset,data,size);
+            }
+
+            int64   Peek(void *data,int64 size) override
+            {
+                int64 left=Avaiable();
+
+                if(left<size)
+                    size=left;
+
+                int64 result=Read(data,size);
+
+                if(result>0)
+                    Seek(-result,SeekOrigin::Current);
+
+                return result;
+            }
+
+            int64   ReadFully(void *buf,int64 buf_size){return Read(buf,buf_size);}         ///<充分读取,保证读取到指定长度的数据(不计算超时)
+
+            bool    CanRestart()const override{return(true);}
+            bool    CanSeek()const override{return(true);}
+            bool    CanSize()const override{return(true);}
+            bool    CanPeek()const override{return(false);}
+
+            bool    Restart() override
+            {
+                Seek(0,soBegin);
+                return(true);
+            }
+
+            int64   Skip(int64 size) override
+            {
+                return Seek(size,SeekOrigin::Current);
+            }
+
+            int64   Seek(int64 offset,SeekOrigin so) override
+            {
+                return AAsset_seek64(asset,offset,(int)so);
+            }
+
+            int64   Tell()const override
+            {
+                return Seek(0,SeekOrigin::Current);
+            }
+
+            int64   GetSize()const override
+            {
+                return AAsset_getLength64(asset);
+            }
+
+            int64   Available()const override
+            {
+                return AAsset_getRemainingLength64(asset);
+            }
+        };//class AndroidAssetInputStream:public io::InputStream
+    }//namespace
+
+    void InitAssetManager(AAssetManager *am)
+    {
+        asset_manager=am;
+    }
+
+    io::InputStream *OpenAsset(const UTF8String &filename)
+    {
+        AAsset *asset = AAssetManager_open(asset_manager, filename.c_str(), AASSET_MODE_BUFFER);
+
+        if(!asset)return(nullptr);
+
+        return(new AndroidAssetInputStream(asset));
+    }
+}//namespace hgl