From ae222bf4fa131b8b86dd0662b32214eb161ace1a Mon Sep 17 00:00:00 2001
From: jsmall-nvidia <jsmall@nvidia.com>
Date: Wed, 2 Dec 2020 11:29:38 -0500
Subject: Zip FileSystem support (#1617)

* #include an absolute path didn't work - because paths were taken to always be relative.

* Add miniz

* Fix for separator in CacheFileSystem.
Add compression unit test for zip.

* Put zip compression into core.

* Remove delimiter stripping if simplifying a path - as stripping will fix delimiters.

* ZipFileSystem WIP.

* More ZipFileSystem working.

* Added isEmpty.
Fixed small bug is contains.

* First pass support for mutability on zip.

* Improvements to File::read/writeAllBytes

* Can access and save archive - but has memory leaks.

* Fix memory leak.

* Some ZIP compression tests.

* Fix memory leak on ScopedAllocation.
Fix off by one bug on UIntSet

* Bug fix in UIntSet

* Fix remaining ZipFileSystem issues.
Adde stand alone unit-test.

* Turn tabs to spaces in slang-io.h

* Renamed mode ReadWrite (instead of just Write)

* Make miniz it's own project.

* Fix windows warning on win32.

* Remove warnings needed when miniz was included as a header library.

* Set the C++ standard via 'flags' in premake.

* Add support for 'implicit' paths.

* Add testing for implicit directories.
Better handling of implicit directories.

* Improve comments in ZipFileSystem.

* Update comment around reader/writer transformation.
---
 source/core/slang-io.cpp | 62 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)

(limited to 'source/core/slang-io.cpp')

diff --git a/source/core/slang-io.cpp b/source/core/slang-io.cpp
index 8e7266dc5..2e2ec3d8b 100644
--- a/source/core/slang-io.cpp
+++ b/source/core/slang-io.cpp
@@ -832,6 +832,68 @@ namespace Slang
         return _Move(buffer);
     }
 
+    SlangResult File::readAllBytes(const String& path, ScopedAllocation& out)
+    {
+        try
+        {
+            FileStream stream(path, FileMode::Open, FileAccess::Read, FileShare::ReadWrite);
+
+            const Int64 start = stream.getPosition();
+            stream.seek(SeekOrigin::End, 0);
+            const Int64 end = stream.getPosition();
+            stream.seek(SeekOrigin::Start, start);
+
+            const Int64 positionSizeInBytes = end - start;
+
+            if (UInt64(positionSizeInBytes) > UInt64(~size_t(0)))
+            {
+                // It's too large to fit in memory.
+                return SLANG_FAIL;
+            }
+
+            const size_t sizeInBytes = size_t(positionSizeInBytes);
+            void* data = out.allocate(sizeInBytes);
+            if (!data)
+            {
+                return SLANG_E_OUT_OF_MEMORY;
+            }
+
+            const size_t readSizeInBytes = stream.read(data, sizeInBytes);
+
+            // If not all read just return an error
+            if (sizeInBytes != readSizeInBytes)
+            {
+                return SLANG_FAIL;
+            }
+        }
+        catch (const IOException&)
+        {
+            return SLANG_FAIL;
+        }
+        return SLANG_OK;
+    }
+
+    SlangResult File::writeAllBytes(const String& path, const void* data, size_t size)
+    {
+        try
+        {
+            FileStream stream(path, FileMode::Create, FileAccess::Write, FileShare::ReadWrite);
+
+            const size_t writeSizeInBytes = stream.write(data, size);
+
+            // If not all written just return an error
+            if (size != writeSizeInBytes)
+            {
+                return SLANG_FAIL;
+            }
+        }
+        catch (const IOException&)
+        {
+            return SLANG_FAIL;
+        }
+        return SLANG_OK;
+    }
+    
     void File::writeAllText(const Slang::String& fileName, const Slang::String& text)
     {
         StreamWriter writer(new FileStream(fileName, FileMode::Create));
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