fixed BufferingReader

src/common/filesystem/source/files.cpp

@@ -334,7 +334,7 @@ int BufferingReader::FillBuffer(ptrdiff_t newpos)
 		// we have read the entire file, so delete our data provider.
 		baseReader.reset();
 	}
-	return read == newpos - bufferpos ? 0 : -1;
+	return newpos == bufferpos ? 0 : -1;
 }
 
 ptrdiff_t BufferingReader::Seek(ptrdiff_t offset, int origin)

src/common/filesystem/source/files_decompress.cpp

@@ -181,7 +181,7 @@ public:
 		inflateEnd (&Stream);
 	}
 
-	ptrdiff_t Read (void *buffer, ptrdiff_t len) override
+	ptrdiff_t Read (void *buffer, ptrdiff_t olen) override
 	{
 		int err = 0;
 
@@ -190,6 +190,7 @@ public:
 			DecompressionError("File not open");
 			return 0;
 		}
+		auto len = olen;
 		if (len == 0) return 0;
 
 		while (len > 0)
@@ -222,7 +223,7 @@ public:
 			return 0;
 		}
 
-		return len - Stream.avail_out;
+		return olen - Stream.avail_out;
 	}
 
 	void FillBuffer ()

src/common/filesystem/source/files_internal.h

@@ -42,6 +42,7 @@ public:
 	{
 		Length = base->Length;
 		buf.resize(Length);
+		bufptr = (const char*)buf.data();
 	}
 
 	ptrdiff_t Seek(ptrdiff_t offset, int origin) override;