Struct IfdDecoder 

pub struct IfdDecoder<'lt> { /* private fields */ }

Reads a directory’s tag values from an underlying stream.

Implementations

impl IfdDecoder<'_>

pub fn find_entry(&self, tag: Tag) -> Option<Entry>

Retrieve the IFD entry for a given tag, if it exists.

The entry contains the metadata of the value, that is its type and count from which we can calculate a total byte size.

pub fn find_tag(&mut self, tag: Tag) -> TiffResult<Option<Value>>

Tries to retrieve a tag. Return Ok(None) if the tag is not present.

pub fn find_tag_buf( &mut self, tag: Tag, buf: &mut ValueBuffer, ) -> TiffResult<Option<Entry>>

Retrieve a tag and reproduce its bytes into the provided buffer.

The buffer is unmodified if the tag is not present.

pub fn find_tag_bytes( &mut self, tag: Tag, buf: &mut [u8], offset: u64, ) -> TiffResult<Option<usize>>

Read bytes of a tag’s value into a byte buffer.

pub fn find_tag_unsigned<T: TryFrom<u64>>( &mut self, tag: Tag, ) -> TiffResult<Option<T>>

Tries to retrieve a tag and convert it to the desired unsigned type.

pub fn find_tag_unsigned_vec<T: TryFrom<u64>>( &mut self, tag: Tag, ) -> TiffResult<Option<Vec<T>>>

Tries to retrieve a vector of all a tag’s values and convert them to the desired unsigned type.

pub fn get_tag_unsigned<T: TryFrom<u64>>(&mut self, tag: Tag) -> TiffResult<T>

Tries to retrieve a tag and convert it to the desired unsigned type. Returns an error if the tag is not present.

pub fn get_tag(&mut self, tag: Tag) -> TiffResult<Value>

Tries to retrieve a tag. Returns an error if the tag is not present

pub fn get_tag_u32(&mut self, tag: Tag) -> TiffResult<u32>

Tries to retrieve a tag and convert it to the desired type.

pub fn get_tag_u64(&mut self, tag: Tag) -> TiffResult<u64>

pub fn get_tag_f32(&mut self, tag: Tag) -> TiffResult<f32>

Tries to retrieve a tag and convert it to the desired type.

pub fn get_tag_f64(&mut self, tag: Tag) -> TiffResult<f64>

Tries to retrieve a tag and convert it to the desired type.

pub fn get_tag_u32_vec(&mut self, tag: Tag) -> TiffResult<Vec<u32>>

Tries to retrieve a tag and convert it to the desired type.

pub fn get_tag_u16_vec(&mut self, tag: Tag) -> TiffResult<Vec<u16>>

pub fn get_tag_u64_vec(&mut self, tag: Tag) -> TiffResult<Vec<u64>>

pub fn get_tag_f32_vec(&mut self, tag: Tag) -> TiffResult<Vec<f32>>

Tries to retrieve a tag and convert it to the desired type.

pub fn get_tag_f64_vec(&mut self, tag: Tag) -> TiffResult<Vec<f64>>

Tries to retrieve a tag and convert it to the desired type.

pub fn get_tag_u8_vec(&mut self, tag: Tag) -> TiffResult<Vec<u8>>

Tries to retrieve a tag and convert it to a 8bit vector.

pub fn get_tag_ascii_string(&mut self, tag: Tag) -> TiffResult<String>

Tries to retrieve a tag and convert it to a ascii vector.

pub fn directory(&self) -> &Directory

Inspect the raw underlying directory.

impl<'l> IfdDecoder<'l>

pub fn tag_iter(self) -> impl Iterator<Item = TiffResult<(Tag, Value)>> + 'l

Returns an iterator over all tags in the current image, along with their values.