Struct png::StreamingDecoder

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pub struct StreamingDecoder { /* private fields */ }
Expand description

PNG StreamingDecoder (low-level interface)

By default, the decoder does not verify Adler-32 checksum computation. To enable checksum verification, set it with StreamingDecoder::set_ignore_adler32 before starting decompression.

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impl StreamingDecoder

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pub fn new() -> StreamingDecoder

Creates a new StreamingDecoder

Allocates the internal buffers.

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pub fn new_with_options(decode_options: DecodeOptions) -> StreamingDecoder

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pub fn reset(&mut self)

Resets the StreamingDecoder

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pub fn info(&self) -> Option<&Info<'static>>

Provides access to the inner info field

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pub fn set_ignore_text_chunk(&mut self, ignore_text_chunk: bool)

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pub fn ignore_adler32(&self) -> bool

Return whether the decoder is set to ignore the Adler-32 checksum.

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pub fn set_ignore_adler32(&mut self, ignore_adler32: bool) -> bool

Set whether to compute and verify the Adler-32 checksum during decompression. Return true if the flag was successfully set.

The decoder defaults to true.

This flag cannot be modified after decompression has started until the StreamingDecoder is reset.

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pub fn set_ignore_crc(&mut self, ignore_crc: bool)

Set whether to compute and verify the Adler-32 checksum during decompression.

The decoder defaults to false.

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pub fn set_skip_ancillary_crc_failures( &mut self, skip_ancillary_crc_failures: bool )

Ignore ancillary chunks if CRC fails

Defaults to true

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pub fn update( &mut self, buf: &[u8], image_data: &mut Vec<u8> ) -> Result<(usize, Decoded), DecodingError>

Low level StreamingDecoder interface.

Allows to stream partial data to the encoder. Returns a tuple containing the bytes that have been consumed from the input buffer and the current decoding result. If the decoded chunk was an image data chunk, it also appends the read data to image_data.

Trait Implementations§

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impl Default for StreamingDecoder

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fn default() -> Self

Returns the “default value” for a type. Read more

Auto Trait Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

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where T: ?Sized,

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fn borrow(&self) -> &T

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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

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impl<T> From<T> for T

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fn from(t: T) -> T

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

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impl<T, U> TryFrom<U> for T
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type Error = Infallible

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Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

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Performs the conversion.