Ability to flush a GLB manifest to a stream (#143)

GLTFSDK/Inc/GLTFSDK/GLBResourceWriter.h

@@ -20,6 +20,9 @@ namespace Microsoft
             GLBResourceWriter(std::unique_ptr<IStreamWriterCache> streamCache);
             GLBResourceWriter(std::unique_ptr<IStreamWriterCache> streamCache, std::unique_ptr<std::iostream> tempBufferStream);
 
+            // Write to a stream instead of a file (can be useful for draco compression)
+            template <typename T>
+            void FlushStream(const std::string& manifest, T* stream);
             void Flush(const std::string& manifest, const std::string& uri);
             std::string GenerateBufferUri(const std::string& bufferId) const override;
             std::ostream* GetBufferStream(const std::string& bufferId) override;

GLTFSDK/Inc/GLTFSDK/GLTFResourceWriter.h

@@ -4,6 +4,7 @@
 #pragma once
 
 #include <GLTFSDK/ResourceWriter.h>
+#include <limits>
 
 #include <memory>
 

GLTFSDK/Inc/GLTFSDK/PBRUtils.h

@@ -5,6 +5,7 @@
 
 #include <GLTFSDK/Color.h>
 #include <GLTFSDK/ExtensionsKHR.h>
+#include <limits>
 
 namespace Microsoft
 {

GLTFSDK/Inc/GLTFSDK/ResourceReaderUtils.h

@@ -8,6 +8,7 @@
 #include <string>
 #include <vector>
 #include <cmath>
+#include <limits>
 
 namespace Microsoft
 {

GLTFSDK/Source/GLBResourceWriter.cpp

@@ -4,6 +4,7 @@
 #include <GLTFSDK/GLBResourceWriter.h>
 
 #include <sstream>
+#include <fstream>
 
 using namespace Microsoft::glTF;
 
@@ -42,7 +43,8 @@ GLBResourceWriter::GLBResourceWriter(std::unique_ptr<IStreamWriterCache> streamC
 {
 }
 
-void GLBResourceWriter::Flush(const std::string& manifest, const std::string& uri)
+template <typename T>
+void GLBResourceWriter::FlushStream(const std::string& manifest, T* stream)
 {
     uint32_t jsonChunkLength = static_cast<uint32_t>(manifest.length());
     const uint32_t jsonPaddingLength = ::CalculatePadding(jsonChunkLength);
@@ -59,7 +61,6 @@ void GLBResourceWriter::Flush(const std::string& manifest, const std::string& ur
         + sizeof(binaryChunkLength) + GLB_CHUNK_TYPE_SIZE // 8 bytes (BIN header)
         + binaryChunkLength;
 
-    auto stream = m_streamWriterCache->Get(uri);
 
     // Write GLB header (12 bytes)
     StreamUtils::WriteBinary(*stream, GLB_HEADER_MAGIC_STRING, GLB_HEADER_MAGIC_STRING_SIZE);
@@ -96,6 +97,15 @@ void GLBResourceWriter::Flush(const std::string& manifest, const std::string& ur
     }
 }
 
+template void GLBResourceWriter::FlushStream<std::fstream>(const std::string& manifest, std::fstream* stream);
+template void GLBResourceWriter::FlushStream<std::stringstream>(const std::string& manifest, std::stringstream* stream);
+
+void GLBResourceWriter::Flush(const std::string& manifest, const std::string& uri)
+{
+    auto stream = m_streamWriterCache->Get(uri);
+    this->FlushStream<std::ostream>(manifest, stream.get());
+}
+
 std::string GLBResourceWriter::GenerateBufferUri(const std::string& bufferId) const
 {
     std::string bufferUri;

GLTFSDK/Source/Validation.cpp

@@ -7,6 +7,8 @@
 
 #include <sstream>
 
+#include <limits>
+
 using namespace Microsoft::glTF;
 
 namespace

GLTFSDK/Source/Version.cpp

@@ -8,6 +8,7 @@
 #include <set>
 #include <regex>
 #include <sstream>
+#include <limits>
 
 using namespace Microsoft::glTF;