Add shortByteString builder. Prepare the changelog for a major release.

CHANGELOG.md

@@ -1,15 +1,22 @@
 # Revision history for small-bytearray-builder
 
-## 0.3.0.0 -- 2019-??-??
+## 0.3.0.0 -- 2019-10-17
 
-* Introduce `consLensBE32` for efficient serialization of wire protocols
-  that require prefixing a payload with its length.
+* Breaking change: Change the internal implementation of `Builder`. This
+  now works a lot more like the builder from `bytestring`. It accumulates
+  chunks and can do a zero-copy appends when working with a sufficiently
+  large immutable chunk. This introduces a mild performance regression
+  (around 10%), but it makes the libary more generally useful.
+* Introduce `consLengthBE32` and `consLength64BE` for efficient serialization
+  of wire protocols that require prefixing a payload with its length.
 * Add `int{16,32,64}BE` and `int{16,32,64LE}` as conveniences.
 * Add little-endian encoding functions for `Word16`, `Word32`, and `Word64`.
 * Add big-endian and little-endian functions for copying a
   `PrimArray` of numbers (both signed and unsigned) into a builder.
 * Add `flush`, `copy`, and `insert` for better control when
   converting byte sequences to builders.
+* Add `shortByteString` to improve interoperability with the
+  `bytestring` library. 
 
 ## 0.2.1.0 -- 2019-09-05
 

src/Data/ByteArray/Builder.hs

@@ -18,6 +18,7 @@ module Data.ByteArray.Builder
   , copy
   , insert
   , byteArray
+  , shortByteString
   , shortTextUtf8
   , shortTextJsonString
   , cstring
@@ -184,6 +185,11 @@ fromBoundedOne (UnsafeBounded.Builder f) = Builder $ \buf0 off0 len0 cs0 s0 ->
 byteArray :: ByteArray -> Builder
 byteArray a = bytes (Bytes a 0 (PM.sizeofByteArray a))
 
+-- | Create a builder from a short bytestring.
+shortByteString :: ShortByteString -> Builder
+shortByteString (SBS x) = bytes (Bytes a 0 (PM.sizeofByteArray a))
+  where a = ByteArray x
+
 -- | Create a builder from a sliced byte sequence. The variants
 -- 'copy' and 'insert' provide more control over whether or not
 -- the byte sequence is copied or aliased. This function is preferred