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I'm trying to following the docs for the rust ruzstd library as below: let mut zstd_encoder = FrameCompressor::new(CompressionLevel::Fastest); But it gives me error: error[E0283]: type annotations needed for FrameCompressor<_, _, encoding::match_generator::MatchGeneratorDriver> --> src/lib.rs:176:21 | 176 | let mut zstd_encoder = FrameCompressor::new(CompressionLevel::Fastest); | ^^^^^^^^^^^^^^^^ --------------- type must be known at this point | = note: cannot satisfy _: ruzstd::io_nostd::Read = help: the following types implement trait ruzstd::io_nostd::Read: &[u8] &mut T FrameDecoder StreamingDecoder<READ, DEC> decoding::decode_buffer::DecodeBuffer ruzstd::io_nostd::Take<R> note: required by a bound in FrameCompressor --> /usr/local/cargo/registry/src/index.crates.io-1949cf8c6b5b557f/ruzstd-0.8.1/src/encoding/frame_compressor.rs:38:31 | 38 | pub struct FrameCompressor<R: Read, W: Write, M: Matcher> { | ^^^^ required by this bound in FrameCompressor help: consider giving zstd_encoder an explicit type, where the type for type parameter R is specified | 176 | let mut zstd_encoder: FrameCompressor<R, W, _> = FrameCompressor::new(CompressionLevel::Fastest); | ++++++++++++++++++++++++++

You're absolutely right - I apologize for the confusion. Looking at the actual ruzstd documentation, the API is quite different. For `no_std` environments, you should use the lower-level API as shown in the documentation. Here's the correct approach based on the actual ruzstd API: ```rust use ruzstd::{compress_internal, BlockSize, WindowLog, CompressionLevel}; // You need to provide a callback function to handle the compressed data chunks let input_data: &[u8] = b"your data to compress"; compress_internal( input_data, BlockSize::Max256KB, WindowLog::WindowLog19, CompressionLevel::Fastest, false, // use_checksum |compressed_chunk: &[u8]| { // Handle each compressed chunk here // For example, write to your output buffer // Return true to continue, false to abort true } ).expect("Compression failed"); ``` Or if you want to collect all the compressed data: ```rust use ruzstd::{compress_internal, BlockSize, WindowLog, CompressionLevel}; let input_data: &[u8] = b"your data to compress"; let mut compressed_output = heapless::Vec::<u8, 1024>::new(); // or whatever size you need compress_internal( input_data, BlockSize::Max256KB, WindowLog::WindowLog19, CompressionLevel::Fastest, false, |chunk: &[u8]| { // Append the chunk to your output for &byte in chunk { if compressed_output.push(byte).is_err() { return false; // Buffer full, stop compression } } true // Continue compression } ).expect("Compression failed"); // Now compressed_output contains your compressed data ``` This matches the actual ruzstd API where you provide a closure to handle the compressed output chunks rather than working with stream encoders.

Model: phala/qwen3-coder

I'm trying to following the docs for the rust ruzstd library as below: let mut zstd_encoder = FrameCompressor::new(CompressionLevel::Fastest); But it gives me error: error[E0283]: type annotations needed for FrameCompressor<_, _, encoding::match_generator::MatchGeneratorDriver> --> src/lib.rs:176:21 | 176 | let mut zstd_encoder = FrameCompressor::new(CompressionLevel::Fastest); | ^^^^^^^^^^^^^^^^ --------------- type must be known at this point | = note: cannot satisfy _: ruzstd::io_nostd::Read = help: the following types implement trait ruzstd::io_nostd::Read: &[u8] &mut T FrameDecoder StreamingDecoder<READ, DEC> decoding::decode_buffer::DecodeBuffer ruzstd::io_nostd::Take<R> note: required by a bound in FrameCompressor --> /usr/local/cargo/registry/src/index.crates.io-1949cf8c6b5b557f/ruzstd-0.8.1/src/encoding/frame_compressor.rs:38:31 | 38 | pub struct FrameCompressor<R: Read, W: Write, M: Matcher> { | ^^^^ required by this bound in FrameCompressor help: consider giving zstd_encoder an explicit type, where the type for type parameter R is specified | 176 | let mut zstd_encoder: FrameCompressor<R, W, _> = FrameCompressor::new(CompressionLevel::Fastest); | ++++++++++++++++++++++++++

Ah, that's important context! In a `no_std` environment, you'll need to use the `no_std` compatible APIs. Here's how to work with ruzstd in `no_std`: ## Option 1: Using the streaming encoder with no_std ```rust use ruzstd::{StreamingEncoder, CompressionLevel}; use ruzstd::io_nostd::{Write, Cursor}; let mut output_buffer = Vec::new(); let mut encoder = StreamingEncoder::new(Cursor::new(&mut output_buffer), CompressionLevel::Fastest) .expect("Failed to create encoder"); ``` ## Option 2: Direct FrameCompressor with explicit types ```rust use ruzstd::{FrameCompressor, CompressionLevel}; use ruzstd::io_nostd::{Read, Write, Cursor}; let input_data: &[u8] = b"your data"; let mut output_buffer = [0u8; 1024]; // Fixed size buffer let mut write_cursor = Cursor::new(&mut output_buffer[..]); let read_cursor = Cursor::new(input_data); let mut zstd_encoder = FrameCompressor::< Cursor<&[u8]>, Cursor<&mut [u8]>, ruzstd::encoding::match_generator::HashChainMatchFinder >::new(CompressionLevel::Fastest); ``` ## Option 3: Simple compression function (if available in your version) ```rust use ruzstd; let input_data = b"your data here"; // Note: check if this is available in no_std context let compressed = ruzstd::compress(input_data, 1); ``` ## Option 4: Manual frame compression with proper error handling ```rust use ruzstd::{FrameCompressor, CompressionLevel}; use ruzstd::io_nostd::{Write, Cursor}; // Prepare buffers let input_data: &[u8] = b"test data"; let mut output_buffer = [0u8; 1024]; let mut output_cursor = Cursor::new(&mut output_buffer[..]); // Create compressor with explicit types let mut compressor = FrameCompressor::new(CompressionLevel::Fastest); // Compress the data let mut input_cursor = Cursor::new(input_data); let result = compressor.compress(&mut input_cursor, &mut output_cursor); ``` The key differences in `no_std`: 1. Use `ruzstd::io_nostd` instead of `std::io` 2. Explicitly specify generic types since type inference is limited 3. Use stack-allocated arrays or pre-allocated buffers instead of dynamic allocation where possible Which approach fits best with your specific use case?

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