Issue #5 : update readme

README.md

@@ -66,9 +66,10 @@ for esi in 0..n as u32 {
 
 ```rust
 let encoding_symbol_length = 1024;
-let source_block_size = 4; // Number of source symbols in the source block
+let nb_source_symbols = 4; // Number of source symbols in the source block
+let source_block_length = encoding_symbol_length  * nb_source_symbols; // Total size size of the block;
 let mut n = 0u32;
-let mut decoder = raptor_code::SourceBlockDecoder::new(source_block_size);
+let mut decoder = raptor_code::SourceBlockDecoder::new(nb_source_symbols);
 
 while decoder.fully_specified() == false {
     //TODO replace the following line with pkt received from network
@@ -77,8 +78,7 @@ while decoder.fully_specified() == false {
     n += 1;
 }
 
-let source_block_size = encoding_symbol_length  * source_block_size;
-let source_block = decoder.decode(source_block_size as usize);
+let source_block = decoder.decode(source_block_length as usize);
 
 ```