Remove thiserror in favor of derive_more

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ruzstd"
-version = "0.4.0"
+version = "0.5.0"
 authors = ["Moritz Borcherding <[email protected]>"]
 edition = "2018"
 license = "MIT"
@@ -11,17 +11,17 @@ exclude = ["decodecorpus_files/*", "dict_tests/*", "fuzz_decodecorpus/*"]
 readme = "Readme.md"
 
 [dependencies]
-byteorder = { version = "1.4", default-features = false }
+byteorder = { version = "1.5", default-features = false }
 twox-hash = { version = "1.6", default-features = false }
-thiserror = { package = "thiserror-core", version = "1.0.38", default-features = false }
+derive_more = { version = "0.99", default-features = false, features = ["display", "from"] }
 
 [dev-dependencies]
 criterion = "0.3"
 rand = {version = "0.8.5", features = ["small_rng"]}
 
 [features]
 default = ["std"]
-std = ["thiserror/std"]
+std = ["derive_more/error"]
 
 [[bench]]
 name = "reversedbitreader_bench"

src/blocks/literals_section.rs

@@ -14,14 +14,18 @@ pub enum LiteralsSectionType {
     Treeless,
 }
 
-#[derive(Debug, thiserror::Error)]
+#[derive(Debug, derive_more::Display, derive_more::From)]
+#[cfg_attr(feature = "std", derive(derive_more::Error))]
 #[non_exhaustive]
 pub enum LiteralsSectionParseError {
-    #[error("Illegal literalssectiontype. Is: {got}, must be in: 0, 1, 2, 3")]
+    #[display(fmt = "Illegal literalssectiontype. Is: {got}, must be in: 0, 1, 2, 3")]
     IllegalLiteralSectionType { got: u8 },
-    #[error(transparent)]
-    GetBitsError(#[from] GetBitsError),
-    #[error("Not enough byte to parse the literals section header. Have: {have}, Need: {need}")]
+    #[display(fmt = "{_0:?}")]
+    #[from]
+    GetBitsError(GetBitsError),
+    #[display(
+        fmt = "Not enough byte to parse the literals section header. Have: {have}, Need: {need}"
+    )]
     NotEnoughBytes { have: usize, need: u8 },
 }
 

src/blocks/sequence_section.rs

@@ -55,10 +55,13 @@ impl Default for SequencesHeader {
     }
 }
 
-#[derive(Debug, thiserror::Error)]
+#[derive(Debug, derive_more::Display)]
+#[cfg_attr(feature = "std", derive(derive_more::Error))]
 #[non_exhaustive]
 pub enum SequencesHeaderParseError {
-    #[error("source must have at least {need_at_least} bytes to parse header; got {got} bytes")]
+    #[display(
+        fmt = "source must have at least {need_at_least} bytes to parse header; got {got} bytes"
+    )]
     NotEnoughBytes { need_at_least: u8, got: usize },
 }
 

src/decoding/bit_reader.rs

@@ -3,15 +3,18 @@ pub struct BitReader<'s> {
     source: &'s [u8],
 }
 
-#[derive(Debug, thiserror::Error)]
+#[derive(Debug, derive_more::Display)]
+#[cfg_attr(feature = "std", derive(derive_more::Error))]
 #[non_exhaustive]
 pub enum GetBitsError {
-    #[error("Cant serve this request. The reader is limited to {limit} bits, requested {num_requested_bits} bits")]
+    #[display(
+        fmt = "Cant serve this request. The reader is limited to {limit} bits, requested {num_requested_bits} bits"
+    )]
     TooManyBits {
         num_requested_bits: usize,
         limit: u8,
     },
-    #[error("Can't read {requested} bits, only have {remaining} bits left")]
+    #[display(fmt = "Can't read {requested} bits, only have {remaining} bits left")]
     NotEnoughRemainingBits { requested: usize, remaining: usize },
 }
 

src/decoding/block_decoder.rs

@@ -25,72 +25,89 @@ enum DecoderState {
     Failed, //TODO put "self.internal_state = DecoderState::Failed;" everywhere an unresolvable error occurs
 }
 
-#[derive(Debug, thiserror::Error)]
+#[derive(Debug, derive_more::Display, derive_more::From)]
+#[cfg_attr(feature = "std", derive(derive_more::Error))]
 #[non_exhaustive]
 pub enum BlockHeaderReadError {
-    #[error("Error while reading the block header")]
-    ReadError(#[from] io::Error),
-    #[error("Reserved block occured. This is considered corruption by the documentation")]
+    #[display(fmt = "Error while reading the block header")]
+    #[from]
+    ReadError(io::Error),
+    #[display(fmt = "Reserved block occured. This is considered corruption by the documentation")]
     FoundReservedBlock,
-    #[error("Error getting block type: {0}")]
-    BlockTypeError(#[from] BlockTypeError),
-    #[error("Error getting block content size: {0}")]
-    BlockSizeError(#[from] BlockSizeError),
+    #[display(fmt = "Error getting block type: {_0}")]
+    #[from]
+    BlockTypeError(BlockTypeError),
+    #[display(fmt = "Error getting block content size: {_0}")]
+    #[from]
+    BlockSizeError(BlockSizeError),
 }
 
-#[derive(Debug, thiserror::Error)]
+#[derive(Debug, derive_more::Display)]
+#[cfg_attr(feature = "std", derive(derive_more::Error))]
 #[non_exhaustive]
 pub enum BlockTypeError {
-    #[error(
-        "Invalid Blocktype number. Is: {num} Should be one of: 0, 1, 2, 3 (3 is reserved though"
+    #[display(
+        fmt = "Invalid Blocktype number. Is: {num} Should be one of: 0, 1, 2, 3 (3 is reserved though"
     )]
     InvalidBlocktypeNumber { num: u8 },
 }
 
-#[derive(Debug, thiserror::Error)]
+#[derive(Debug, derive_more::Display)]
+#[cfg_attr(feature = "std", derive(derive_more::Error))]
 #[non_exhaustive]
 pub enum BlockSizeError {
-    #[error("Blocksize was bigger than the absolute maximum {ABSOLUTE_MAXIMUM_BLOCK_SIZE} (128kb). Is: {size}")]
+    #[display(
+        fmt = "Blocksize was bigger than the absolute maximum {ABSOLUTE_MAXIMUM_BLOCK_SIZE} (128kb). Is: {size}"
+    )]
     BlockSizeTooLarge { size: u32 },
 }
 
-#[derive(Debug, thiserror::Error)]
+#[derive(Debug, derive_more::Display, derive_more::From)]
+#[cfg_attr(feature = "std", derive(derive_more::Error))]
 #[non_exhaustive]
 pub enum DecompressBlockError {
-    #[error("Error while reading the block content: {0}")]
-    BlockContentReadError(#[from] io::Error),
-    #[error("Malformed section header. Says literals would be this long: {expected_len} but there are only {remaining_bytes} bytes left")]
+    #[display(fmt = "Error while reading the block content: {_0}")]
+    #[from]
+    BlockContentReadError(io::Error),
+    #[display(
+        fmt = "Malformed section header. Says literals would be this long: {expected_len} but there are only {remaining_bytes} bytes left"
+    )]
     MalformedSectionHeader {
         expected_len: usize,
         remaining_bytes: usize,
     },
-    #[error(transparent)]
-    DecompressLiteralsError(#[from] DecompressLiteralsError),
-    #[error(transparent)]
-    LiteralsSectionParseError(#[from] LiteralsSectionParseError),
-    #[error(transparent)]
-    SequencesHeaderParseError(#[from] SequencesHeaderParseError),
-    #[error(transparent)]
-    DecodeSequenceError(#[from] DecodeSequenceError),
-    #[error(transparent)]
-    ExecuteSequencesError(#[from] ExecuteSequencesError),
+    #[display(fmt = "{_0:?}")]
+    #[from]
+    DecompressLiteralsError(DecompressLiteralsError),
+    #[display(fmt = "{_0:?}")]
+    #[from]
+    LiteralsSectionParseError(LiteralsSectionParseError),
+    #[display(fmt = "{_0:?}")]
+    #[from]
+    SequencesHeaderParseError(SequencesHeaderParseError),
+    #[display(fmt = "{_0:?}")]
+    #[from]
+    DecodeSequenceError(DecodeSequenceError),
+    #[display(fmt = "{_0:?}")]
+    #[from]
+    ExecuteSequencesError(ExecuteSequencesError),
 }
 
-#[derive(Debug, thiserror::Error)]
+#[derive(Debug, derive_more::Display, derive_more::From)]
+#[cfg_attr(feature = "std", derive(derive_more::Error))]
 #[non_exhaustive]
 pub enum DecodeBlockContentError {
-    #[error("Can't decode next block if failed along the way. Results will be nonsense")]
+    #[display(fmt = "Can't decode next block if failed along the way. Results will be nonsense")]
     DecoderStateIsFailed,
-    #[error("Cant decode next block body, while expecting to decode the header of the previous block. Results will be nonsense")]
+    #[display(
+        fmt = "Cant decode next block body, while expecting to decode the header of the previous block. Results will be nonsense"
+    )]
     ExpectedHeaderOfPreviousBlock,
-    #[error("Error while reading bytes for {step}: {source}")]
-    ReadError {
-        step: BlockType,
-        #[source]
-        source: io::Error,
-    },
-    #[error(transparent)]
-    DecompressBlockError(#[from] DecompressBlockError),
+    #[display(fmt = "Error while reading bytes for {step}: {source}")]
+    ReadError { step: BlockType, source: io::Error },
+    #[display(fmt = "{_0:?}")]
+    #[from]
+    DecompressBlockError(DecompressBlockError),
 }
 
 pub fn new() -> BlockDecoder {

src/decoding/decodebuffer.rs

@@ -15,12 +15,13 @@ pub struct Decodebuffer {
     pub hash: XxHash64,
 }
 
-#[derive(Debug, thiserror::Error)]
+#[derive(Debug, derive_more::Display)]
+#[cfg_attr(feature = "std", derive(derive_more::Error))]
 #[non_exhaustive]
 pub enum DecodebufferError {
-    #[error("Need {need} bytes from the dictionary but it is only {got} bytes long")]
+    #[display(fmt = "Need {need} bytes from the dictionary but it is only {got} bytes long")]
     NotEnoughBytesInDictionary { got: usize, need: usize },
-    #[error("offset: {offset} bigger than buffer: {buf_len}")]
+    #[display(fmt = "offset: {offset} bigger than buffer: {buf_len}")]
     OffsetTooBig { offset: usize, buf_len: usize },
 }
 

src/decoding/dictionary.rs

@@ -14,17 +14,20 @@ pub struct Dictionary {
     pub offset_hist: [u32; 3],
 }
 
-#[derive(Debug, thiserror::Error)]
+#[derive(Debug, derive_more::Display, derive_more::From)]
+#[cfg_attr(feature = "std", derive(derive_more::Error))]
 #[non_exhaustive]
 pub enum DictionaryDecodeError {
-    #[error(
-        "Bad magic_num at start of the dictionary; Got: {got:#04X?}, Expected: {MAGIC_NUM:#04x?}"
+    #[display(
+        fmt = "Bad magic_num at start of the dictionary; Got: {got:#04X?}, Expected: {MAGIC_NUM:#04x?}"
     )]
     BadMagicNum { got: [u8; 4] },
-    #[error(transparent)]
-    FSETableError(#[from] FSETableError),
-    #[error(transparent)]
-    HuffmanTableError(#[from] HuffmanTableError),
+    #[display(fmt = "{_0:?}")]
+    #[from]
+    FSETableError(FSETableError),
+    #[display(fmt = "{_0:?}")]
+    #[from]
+    HuffmanTableError(HuffmanTableError),
 }
 
 pub const MAGIC_NUM: [u8; 4] = [0x37, 0xA4, 0x30, 0xEC];

src/decoding/literals_section_decoder.rs

@@ -4,32 +4,40 @@ use super::scratch::HuffmanScratch;
 use crate::huff0::{HuffmanDecoder, HuffmanDecoderError, HuffmanTableError};
 use alloc::vec::Vec;
 
-#[derive(Debug, thiserror::Error)]
+#[derive(Debug, derive_more::Display, derive_more::From)]
+#[cfg_attr(feature = "std", derive(derive_more::Error))]
 #[non_exhaustive]
 pub enum DecompressLiteralsError {
-    #[error(
-        "compressed size was none even though it must be set to something for compressed literals"
+    #[display(
+        fmt = "compressed size was none even though it must be set to something for compressed literals"
     )]
     MissingCompressedSize,
-    #[error("num_streams was none even though it must be set to something (1 or 4) for compressed literals")]
+    #[display(
+        fmt = "num_streams was none even though it must be set to something (1 or 4) for compressed literals"
+    )]
     MissingNumStreams,
-    #[error(transparent)]
-    GetBitsError(#[from] GetBitsError),
-    #[error(transparent)]
-    HuffmanTableError(#[from] HuffmanTableError),
-    #[error(transparent)]
-    HuffmanDecoderError(#[from] HuffmanDecoderError),
-    #[error("Tried to reuse huffman table but it was never initialized")]
+    #[display(fmt = "{_0:?}")]
+    #[from]
+    GetBitsError(GetBitsError),
+    #[display(fmt = "{_0:?}")]
+    #[from]
+    HuffmanTableError(HuffmanTableError),
+    #[display(fmt = "{_0:?}")]
+    #[from]
+    HuffmanDecoderError(HuffmanDecoderError),
+    #[display(fmt = "Tried to reuse huffman table but it was never initialized")]
     UninitializedHuffmanTable,
-    #[error("Need 6 bytes to decode jump header, got {got} bytes")]
+    #[display(fmt = "Need 6 bytes to decode jump header, got {got} bytes")]
     MissingBytesForJumpHeader { got: usize },
-    #[error("Need at least {needed} bytes to decode literals. Have: {got} bytes")]
+    #[display(fmt = "Need at least {needed} bytes to decode literals. Have: {got} bytes")]
     MissingBytesForLiterals { got: usize, needed: usize },
-    #[error("Padding at the end of the sequence_section was more than a byte long: {skipped_bits} bits. Probably caused by data corruption")]
+    #[display(
+        fmt = "Padding at the end of the sequence_section was more than a byte long: {skipped_bits} bits. Probably caused by data corruption"
+    )]
     ExtraPadding { skipped_bits: i32 },
-    #[error("Bitstream was read till: {read_til}, should have been: {expected}")]
+    #[display(fmt = "Bitstream was read till: {read_til}, should have been: {expected}")]
     BitstreamReadMismatch { read_til: isize, expected: isize },
-    #[error("Did not decode enough literals: {decoded}, Should have been: {expected}")]
+    #[display(fmt = "Did not decode enough literals: {decoded}, Should have been: {expected}")]
     DecodedLiteralCountMismatch { decoded: usize, expected: usize },
 }
 

src/decoding/ringbuffer.rs

@@ -268,8 +268,6 @@ impl RingBuffer {
     /// 2. More then len reserved space so we do not write out-of-bounds
     #[warn(unsafe_op_in_unsafe_fn)]
     pub unsafe fn extend_from_within_unchecked(&mut self, start: usize, len: usize) {
-        debug_assert!(!self.buf.as_ptr().is_null());
-
         if self.head < self.tail {
             // continous data slice  |____HDDDDDDDT_____|
             let after_tail = usize::min(len, self.cap - self.tail);

src/decoding/sequence_execution.rs

@@ -1,13 +1,15 @@
 use super::{decodebuffer::DecodebufferError, scratch::DecoderScratch};
 
-#[derive(Debug, thiserror::Error)]
+#[derive(Debug, derive_more::Display, derive_more::From)]
+#[cfg_attr(feature = "std", derive(derive_more::Error))]
 #[non_exhaustive]
 pub enum ExecuteSequencesError {
-    #[error(transparent)]
-    DecodebufferError(#[from] DecodebufferError),
-    #[error("Sequence wants to copy up to byte {wanted}. Bytes in literalsbuffer: {have}")]
+    #[display(fmt = "{_0:?}")]
+    #[from]
+    DecodebufferError(DecodebufferError),
+    #[display(fmt = "Sequence wants to copy up to byte {wanted}. Bytes in literalsbuffer: {have}")]
     NotEnoughBytesForSequence { wanted: usize, have: usize },
-    #[error("Illegal offset: 0 found")]
+    #[display(fmt = "Illegal offset: 0 found")]
     ZeroOffset,
 }