fix some clippy warnings

[nihav.git] / nihav-core / src / io / codebook.rs

diff --git a/nihav-core/src/io/codebook.rs b/nihav-core/src/io/codebook.rs
index 553f2f9c84e77415580404ae38fb58c092bd465c..6ea3b1ee5ea4ff65df5700d02368a2d021d0f786 100644 (file)
--- a/nihav-core/src/io/codebook.rs
+++ b/nihav-core/src/io/codebook.rs
@@ -113,6 +113,7 @@ pub struct ShortCodebookDesc {
 ///
 /// [`ShortCodebookDescReader`]: ./struct.ShortCodebookDescReader.html
 /// [`TableCodebookDescReader`]: ./struct.TableCodebookDescReader.html
+#[allow(clippy::len_without_is_empty)]
 pub trait CodebookDescReader<S> {
     /// Returns the codeword length for the provided index.
     fn bits(&mut self, idx: usize) -> u8;
@@ -143,7 +144,7 @@ pub trait CodebookReader<S> {
 pub const TABLE_FILL_VALUE: u32 = 0x7F;
 const MAX_LUT_BITS: u8 = 10;
 
-fn fill_lut_msb(table: &mut Vec<u32>, off: usize,
+fn fill_lut_msb(table: &mut [u32], off: usize,
                 code: u32, bits: u8, lut_bits: u8, symidx: u32, esc: bool) -> CodebookResult<()> {
     if !esc {
         let fill_len  = lut_bits - bits;
@@ -163,7 +164,7 @@ fn fill_lut_msb(table: &mut Vec<u32>, off: usize,
     Ok(())
 }
 
-fn fill_lut_lsb(table: &mut Vec<u32>, off: usize,
+fn fill_lut_lsb(table: &mut [u32], off: usize,
                 code: u32, bits: u8, lut_bits: u8, symidx: u32, esc: bool) -> CodebookResult<()> {
     if !esc {
         let fill_len  = lut_bits - bits;
@@ -183,7 +184,7 @@ fn fill_lut_lsb(table: &mut Vec<u32>, off: usize,
     Ok(())
 }
 
-fn fill_lut(table: &mut Vec<u32>, mode: CodebookMode,
+fn fill_lut(table: &mut [u32], mode: CodebookMode,
             off: usize, code: u32, bits: u8, lut_bits: u8, symidx: u32, esc: bool) -> CodebookResult<bool> {
     match mode {
         CodebookMode::MSB => fill_lut_msb(table, off, code, bits, lut_bits, symidx, esc)?,
@@ -288,7 +289,7 @@ fn build_esc_lut(table: &mut Vec<u32>,
 impl<S: Copy> Codebook<S> {
 
     /// Constructs a new `Codebook` instance using provided codebook description and mode.
-    pub fn new(cb: &mut CodebookDescReader<S>, mode: CodebookMode) -> CodebookResult<Self> {
+    pub fn new(cb: &mut dyn CodebookDescReader<S>, mode: CodebookMode) -> CodebookResult<Self> {
         let mut maxbits = 0;
         let mut nnz = 0;
         let mut escape_list: EscapeCodes = HashMap::new();
@@ -345,7 +346,7 @@ impl<S: Copy> Codebook<S> {
         }
 
         for bucket in escape_list.values() {
-            build_esc_lut(&mut table, mode, &bucket)?;
+            build_esc_lut(&mut table, mode, bucket)?;
         }
 
         for i in 0..cb.len() {
@@ -370,10 +371,10 @@ impl<'a, S: Copy> CodebookReader<S> for BitReader<'a> {
             let bits = cb.table[lut_idx] & 0x7F;
             esc  = (cb.table[lut_idx] & 0x80) != 0;
             idx  = (cb.table[lut_idx] >> 8) as usize;
-            if (bits as isize) > self.left() {
+            let skip_bits = if esc { u32::from(lut_bits) } else { bits };
+            if (skip_bits as isize) > self.left() {
                 return Err(CodebookError::InvalidCode);
             }
-            let skip_bits = if esc { u32::from(lut_bits) } else { bits };
             self.skip(skip_bits as u32).unwrap();
             lut_bits = bits as u8;
         }