add support for responding with partial cache chunks (#11)

* add support for responding with partial cache chunks

3 files changed, 8 insertions, 5 deletions

diff --git a/src/zenutil/cache/cacherequests.cpp b/src/zenutil/cache/cacherequests.cpp
index f4de6bacd..442cf0dfc 100644
--- a/src/zenutil/cache/cacherequests.cpp
+++ b/src/zenutil/cache/cacherequests.cpp
@@ -792,8 +792,9 @@ namespace cacherequests {
 			bool Succeeded			 = !RawHashField.HasError();
 			if (Succeeded)
 			{
+				ValueResult.RawOffset		   = RecordObject["RawOffset"].AsUInt64(0);
 				const CbAttachment* Attachment = Package.FindAttachment(ValueResult.RawHash);
-				ValueResult.Body			   = Attachment ? Attachment->AsCompressedBinary() : CompressedBuffer();
+				ValueResult.Body			   = Attachment ? Attachment->AsCompressedBinary().MakeOwned() : CompressedBuffer();
 				if (ValueResult.Body)
 				{
 					ValueResult.RawSize = ValueResult.Body.DecodeRawSize();
diff --git a/src/zenutil/include/zenutil/cache/cacherequests.h b/src/zenutil/include/zenutil/cache/cacherequests.h
index abc5a3c13..0913efc65 100644
--- a/src/zenutil/include/zenutil/cache/cacherequests.h
+++ b/src/zenutil/include/zenutil/cache/cacherequests.h
@@ -195,9 +195,10 @@ namespace cacherequests {
 
 	struct CacheValueResult
 	{
-		uint64_t		 RawSize = 0;
-		IoHash			 RawHash = IoHash::Zero;
-		CompressedBuffer Body	 = CompressedBuffer::Null;
+		uint64_t		 RawSize   = 0;
+		uint64_t		 RawOffset = 0;
+		IoHash			 RawHash   = IoHash::Zero;
+		CompressedBuffer Body	   = CompressedBuffer::Null;
 	};
 
 	struct CacheValuesResult
diff --git a/src/zenutil/include/zenutil/packageformat.h b/src/zenutil/include/zenutil/packageformat.h
index 0b8495fbd..c90b840da 100644
--- a/src/zenutil/include/zenutil/packageformat.h
+++ b/src/zenutil/include/zenutil/packageformat.h
@@ -89,7 +89,8 @@ enum class RpcAcceptOptions : uint16_t
 {
 	kNone						 = 0,
 	kAllowLocalReferences		 = (1u << 0),
-	kAllowPartialLocalReferences = (1u << 1)
+	kAllowPartialLocalReferences = (1u << 1),
+	kAllowPartialCacheChunks	 = (1u << 2)
 };
 
 gsl_DEFINE_ENUM_BITMASK_OPERATORS(RpcAcceptOptions);