FileExists returns true if a file exists for the given chunk ID.

GetFileByChunkId returns a handle to the chunk file.

NewChunk allocates the space for the new file and writes the chunk.

ParseChunkInfo parses the posted form data and returns it as a ChunkInfo object.

ParseFileHeader parses the formdata and returns a FileHeader.

ParseMultipartHeader converts a multipart.FileHeader to the internal FileHeader.

ChunkInfo contains info about the current chunk.

FileHeader contains info about the uploaded file.