46 lines
1.4 KiB
Rust
46 lines
1.4 KiB
Rust
use std::convert::TryFrom;
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use std::io::{Read, Seek};
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use crate::tags::Tag;
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use crate::{TiffError, TiffFormatError, TiffResult};
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use super::ifd::{Directory, Value};
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use super::stream::SmartReader;
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use super::Limits;
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pub(crate) struct TagReader<'a, R: Read + Seek> {
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pub reader: &'a mut SmartReader<R>,
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pub ifd: &'a Directory,
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pub limits: &'a Limits,
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pub bigtiff: bool,
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}
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impl<'a, R: Read + Seek> TagReader<'a, R> {
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pub(crate) fn find_tag(&mut self, tag: Tag) -> TiffResult<Option<Value>> {
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Ok(match self.ifd.get(&tag) {
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Some(entry) => Some(entry.clone().val(self.limits, self.bigtiff, self.reader)?),
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None => None,
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})
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}
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pub(crate) fn require_tag(&mut self, tag: Tag) -> TiffResult<Value> {
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match self.find_tag(tag)? {
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Some(val) => Ok(val),
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None => Err(TiffError::FormatError(
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TiffFormatError::RequiredTagNotFound(tag),
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)),
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}
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}
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pub fn find_tag_uint_vec<T: TryFrom<u64>>(&mut self, tag: Tag) -> TiffResult<Option<Vec<T>>> {
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self.find_tag(tag)?
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.map(|v| v.into_u64_vec())
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.transpose()?
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.map(|v| {
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v.into_iter()
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.map(|u| {
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T::try_from(u).map_err(|_| TiffFormatError::InvalidTagValueType(tag).into())
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})
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.collect()
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})
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.transpose()
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}
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}
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