Struct ValueReader 

pub struct ValueReader<'a, R: RangeReader> { /* private fields */ }

Reads tag values from a TIFF file.

This struct combines a RangeReader with TIFF header information to read values respecting the file’s byte order and format.

Implementations

impl<'a, R: RangeReader> ValueReader<'a, R>

pub fn new(reader: &'a R, header: &'a TiffHeader) -> Self

Create a new ValueReader.

pub fn byte_order(&self) -> ByteOrder

Get the byte order from the header.

pub async fn read_bytes(&self, entry: &IfdEntry) -> Result<Bytes, TiffError>

Read raw bytes for an IFD entry’s value.

For inline values, returns the bytes from the entry. For offset values, fetches the bytes from the file.

pub async fn read_u32(&self, entry: &IfdEntry) -> Result<u32, TiffError>

Read a single u32 value from an entry.

Handles both Short and Long field types, converting as needed.

pub async fn read_u64(&self, entry: &IfdEntry) -> Result<u64, TiffError>

Read a single u64 value from an entry.

Handles Short, Long, and Long8 field types, converting as needed.

pub async fn read_u64_array( &self, entry: &IfdEntry, ) -> Result<Vec<u64>, TiffError>

Read an array of u64 values from an entry.

This is the primary method for reading TileOffsets and TileByteCounts. The entire array is fetched in a single range request for efficiency.

Handles Short, Long, and Long8 field types, converting all to u64.

pub async fn read_u32_array( &self, entry: &IfdEntry, ) -> Result<Vec<u32>, TiffError>

Read an array of u32 values from an entry.

Similar to read_u64_array but returns u32 values. Useful for tile dimensions and other 32-bit array values.

pub async fn read_string(&self, entry: &IfdEntry) -> Result<String, TiffError>

Read a string value from an entry (ASCII type).

The string is expected to be null-terminated. The null terminator is stripped from the result.

pub async fn read_raw_bytes(&self, entry: &IfdEntry) -> Result<Bytes, TiffError>

Read raw bytes from an entry (for UNDEFINED or opaque data).

This is used for JPEGTables and other binary data.