Design: Blob

[streetycat]

I want to implement a Blob object to contain a binnary buffer(Vec).It's like the Chunk,but not saved in the NDN, It may be easier to use than chunk.

[streetycat]

enum BlobDescContent {
    Value(Vec<u8>), // Short Blob
    Hash(HashValue), // large Blob, the value is in `Body`
    Key(String) // <key, value>, the mutable `Blob` value is in `Body`
};

struct BlobBodyContent(Vec<u8>);

// interface
impl Blob {
     pub fn new(value: Vec<u8>, key: Option<String>) {
         if key.is_some() {
             //  the `Blob` is mutable
         }
         if key.is_none() {
             // the `Blob` is immutable
             if value.len > 32KBytes {
                  // save the value in `Body`
             } else {
                  // save the value in `Desc`
             }
         }
     }
     pub fn value(&self) -> &[u8] {
     }
     pub fn key(&self) -> Option<&str> {
     }
     pub fn set_value(&mut self) -> BuckyResult<&[u8]> {

     }
}
```

[streetycat]

There is an object named Storage with the same function.I found it while sorting through the documentation.