- Added a ChunkMap class responsible for allocating new chunks to be downloaded, according to

- a given chunk strategy
	- the availablility map of each source 
- Integrated this into ftFileCreator
- added gui menu in file transfer+right click to change the chunk strategy: streaming vs. random

Next step: 
	- loading/saving file downloading state and availability map
	- displaying chunk details in the selected transfer tab (e.g. list of currently worked chunks, and their current downloading completion)



git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@1863 b45a01b8-16f6-495d-af2f-9b41ad6348cc

libretroshare/src/rsiface/rsfiles.h

@@ -110,6 +110,7 @@ virtual ~RsFiles() { return; }
 virtual bool FileRequest(std::string fname, std::string hash, uint64_t size,
 		std::string dest, uint32_t flags, std::list<std::string> srcIds) = 0;
 virtual bool FileCancel(std::string hash) = 0;
+virtual bool setChunkStrategy(const std::string& hash,FileChunksInfo::ChunkStrategy) = 0;
 virtual bool FileControl(std::string hash, uint32_t flags) = 0;
 virtual bool FileClearCompleted() = 0;
 

libretroshare/src/rsiface/rstypes.h

@@ -252,6 +252,7 @@ class FileChunksInfo
 {
 	public:
 	enum ChunkState { CHUNK_DONE, CHUNK_ACTIVE, CHUNK_OUTSTANDING } ;
+	enum ChunkStrategy { CHUNK_STRATEGY_STREAMING, CHUNK_STRATEGY_RANDOM } ;
 
 	uint64_t file_size ;					// real size of the file
 	uint32_t chunk_size ;				// size of chunks