diff options
| author | cutealien <cutealien@dfc29bdd-3216-0410-991c-e03cc46cb475> | 2020-01-03 19:05:16 +0000 |
|---|---|---|
| committer | cutealien <cutealien@dfc29bdd-3216-0410-991c-e03cc46cb475> | 2020-01-03 19:05:16 +0000 |
| commit | 2ae2a551a6290f46734307bbfdafea4b1a2cf2ba (patch) | |
| tree | ba2f0b468640e44899fed3df2d4cc58795f4a003 /source/Irrlicht/CLimitReadFile.cpp | |
| download | irrlicht-2ae2a551a6290f46734307bbfdafea4b1a2cf2ba.tar.xz | |
Merging r5975 through r6036 from trunk to ogl-es branch.
GLES drivers adapted, but only did make compile-tests.
git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/branches/ogl-es@6038 dfc29bdd-3216-0410-991c-e03cc46cb475
Diffstat (limited to 'source/Irrlicht/CLimitReadFile.cpp')
| -rw-r--r-- | source/Irrlicht/CLimitReadFile.cpp | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/source/Irrlicht/CLimitReadFile.cpp b/source/Irrlicht/CLimitReadFile.cpp new file mode 100644 index 0000000..f65b700 --- /dev/null +++ b/source/Irrlicht/CLimitReadFile.cpp @@ -0,0 +1,127 @@ +// Copyright (C) 2002-2012 Nikolaus Gebhardt
+// This file is part of the "Irrlicht Engine".
+// For conditions of distribution and use, see copyright notice in irrlicht.h
+
+#include "CLimitReadFile.h"
+#include "irrString.h"
+
+namespace irr
+{
+namespace io
+{
+
+
+CLimitReadFile::CLimitReadFile(IReadFile* alreadyOpenedFile, long pos,
+ long areaSize, const io::path& name)
+ : Filename(name), AreaStart(0), AreaEnd(0), Pos(0),
+ File(alreadyOpenedFile)
+{
+ #ifdef _DEBUG
+ setDebugName("CLimitReadFile");
+ #endif
+
+ if (File)
+ {
+ File->grab();
+ AreaStart = pos;
+ AreaEnd = AreaStart + areaSize;
+ }
+}
+
+
+CLimitReadFile::~CLimitReadFile()
+{
+ if (File)
+ File->drop();
+}
+
+
+//! returns how much was read
+size_t CLimitReadFile::read(void* buffer, size_t sizeToRead)
+{
+ if (0 == File)
+ return 0;
+
+#if 1
+ long r = AreaStart + Pos;
+ long toRead = core::min_(AreaEnd, r + (long)sizeToRead) - core::max_(AreaStart, r);
+ if (toRead < 0)
+ return 0;
+ File->seek(r);
+ r = (long)File->read(buffer, toRead);
+ Pos += r;
+ return r;
+#else
+ const long pos = File->getPos();
+
+ if (pos >= AreaEnd)
+ return 0;
+
+ if (pos + (long)sizeToRead >= AreaEnd)
+ sizeToRead = AreaEnd - pos;
+
+ return File->read(buffer, sizeToRead);
+#endif
+}
+
+
+//! changes position in file, returns true if successful
+bool CLimitReadFile::seek(long finalPos, bool relativeMovement)
+{
+#if 1
+ Pos = core::s32_clamp(finalPos + (relativeMovement ? Pos : 0 ), 0, AreaEnd - AreaStart);
+ return true;
+#else
+ const long pos = File->getPos();
+
+ if (relativeMovement)
+ {
+ if (pos + finalPos > AreaEnd)
+ finalPos = AreaEnd - pos;
+ }
+ else
+ {
+ finalPos += AreaStart;
+ if (finalPos > AreaEnd)
+ return false;
+ }
+
+ return File->seek(finalPos, relativeMovement);
+#endif
+}
+
+
+//! returns size of file
+long CLimitReadFile::getSize() const
+{
+ return AreaEnd - AreaStart;
+}
+
+
+//! returns where in the file we are.
+long CLimitReadFile::getPos() const
+{
+#if 1
+ return Pos;
+#else
+ return File->getPos() - AreaStart;
+#endif
+}
+
+
+//! returns name of file
+const io::path& CLimitReadFile::getFileName() const
+{
+ return Filename;
+}
+
+
+IReadFile* createLimitReadFile(const io::path& fileName, IReadFile* alreadyOpenedFile, long pos, long areaSize)
+{
+ return new CLimitReadFile(alreadyOpenedFile, pos, areaSize, fileName);
+}
+
+
+} // end namespace io
+} // end namespace irr
+
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