feat: impl Default for brotli::EncoderParams

Author: robjtede

CHANGELOG.md

@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0),
 
 ## Unreleased
 
+- Implement `Default` for `brotli::EncoderParams`.
+
 ## 0.4.2
 
 - Add top-level `brotli` module containing stable `brotli` crate wrapper types.

src/brotli.rs

@@ -2,18 +2,27 @@
 
 use brotli::enc::backward_references::{BrotliEncoderMode, BrotliEncoderParams};
 
-/// A compression parameter for Brotli. This is a stable wrapper around Brotli's own encoder params
-/// type, to abstract over different versions of the Brotli library.
+/// Brotli compression parameters builder. This is a stable wrapper around Brotli's own encoder
+/// params type, to abstract over different versions of the Brotli library.
 ///
 /// See the [Brotli documentation](https://www.brotli.org/encode.html#a9a8) for more information on
 /// these parameters.
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+///
+/// # Examples
+///
+/// ```
+/// use async_compression::brotli;
+///
+/// let params = brotli::EncoderParams::default()
+///     .window_size(12)
+///     .text_mode();
+/// ```
+#[derive(Debug, Clone, Copy, Default, PartialEq, Eq)]
 pub struct EncoderParams {
-    window_size: i32,
-    block_size: i32,
-    size_hint: usize,
-    mode: BrotliEncoderMode,
+    window_size: Option<i32>,
+    block_size: Option<i32>,
+    size_hint: Option<usize>,
+    mode: Option<BrotliEncoderMode>,
 }
 
 impl EncoderParams {
@@ -23,7 +32,7 @@ impl EncoderParams {
     ///
     /// `window_size` is clamped to `0 <= window_size <= 24`.
     pub fn window_size(mut self, window_size: i32) -> Self {
-        self.window_size = window_size.clamp(0, 24);
+        self.window_size = Some(window_size.clamp(0, 24));
         self
     }
 
@@ -33,13 +42,13 @@ impl EncoderParams {
     ///
     /// `block_size` is clamped to `16 <= block_size <= 24`.
     pub fn block_size(mut self, block_size: i32) -> Self {
-        self.block_size = block_size.clamp(16, 24);
+        self.block_size = Some(block_size.clamp(16, 24));
         self
     }
 
     /// Sets hint for size of data to be compressed.
     pub fn size_hint(mut self, size_hint: usize) -> Self {
-        self.size_hint = size_hint;
+        self.size_hint = Some(size_hint);
         self
     }
 
@@ -50,17 +59,36 @@ impl EncoderParams {
     ///
     /// Used as Brotli's `mode` parameter.
     pub fn text_mode(mut self) -> Self {
-        self.mode = BrotliEncoderMode::BROTLI_MODE_TEXT;
+        self.mode = Some(BrotliEncoderMode::BROTLI_MODE_TEXT);
         self
     }
 
     pub(crate) fn as_brotli(&self) -> BrotliEncoderParams {
-        BrotliEncoderParams {
-            lgwin: self.window_size,
-            lgblock: self.block_size,
-            size_hint: self.size_hint,
-            mode: self.mode,
-            ..Default::default()
+        let mut params = BrotliEncoderParams::default();
+
+        let Self {
+            window_size,
+            block_size,
+            size_hint,
+            mode,
+        } = self;
+
+        if let Some(window_size) = window_size {
+            params.lgwin = *window_size;
         }
+
+        if let Some(block_size) = block_size {
+            params.lgblock = *block_size;
+        }
+
+        if let Some(size_hint) = size_hint {
+            params.size_hint = *size_hint;
+        }
+
+        if let Some(mode) = mode {
+            params.mode = *mode;
+        }
+
+        params
     }
 }