pub struct Crc32cVerifyingReader<R> { /* private fields */ }Expand description
v0.8.4 #73 H-1: streaming GET integrity guard. Wraps an inner AsyncRead
(typically the output of cpu_zstd_decompress_stream) and computes a
rolling CRC32C as bytes flow through. On EOF the rolling CRC and the
observed byte count are compared against the manifest-declared values; a
mismatch surfaces as io::ErrorKind::InvalidData so the HTTP body stream
fails — the client sees a truncated / aborted response rather than silent
corruption.
The wrapper is bytes-pass-through: the entire payload reaches the client as soon as each chunk is produced (no buffering of the plaintext), preserving the streaming TTFB property that the unwrapped CpuZstd path already has. The integrity decision lands at EOF, which on a corrupted body shows up as a streaming error tail (HTTP/1.1 chunked: an aborted final chunk; HTTP/2: RST_STREAM with INTERNAL_ERROR).
Why a custom wrapper instead of, say, a tokio_util adapter: the rolling
CRC needs both the per-chunk bytes (to fold into the running checksum)
and the EOF signal (to issue the final compare); the existing wrappers
in tokio-util (StreamReader, InspectReader) only expose pre-EOF
byte hooks and would require a separate end-of-stream reactor.
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impl<R> Freeze for Crc32cVerifyingReader<R>where
R: Freeze,
impl<R> RefUnwindSafe for Crc32cVerifyingReader<R>where
R: RefUnwindSafe,
impl<R> Send for Crc32cVerifyingReader<R>where
R: Send,
impl<R> Sync for Crc32cVerifyingReader<R>where
R: Sync,
impl<R> Unpin for Crc32cVerifyingReader<R>where
R: Unpin,
impl<R> UnsafeUnpin for Crc32cVerifyingReader<R>where
R: UnsafeUnpin,
impl<R> UnwindSafe for Crc32cVerifyingReader<R>where
R: UnwindSafe,
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