524 lines
12 KiB
Rust
524 lines
12 KiB
Rust
use std::{borrow::Cow, io::Write, slice::from_ref};
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use crate::{bytecast, tags::Type, TiffError, TiffFormatError, TiffResult};
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use super::writer::TiffWriter;
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/// Trait for types that can be encoded in a tiff file
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pub trait TiffValue {
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const BYTE_LEN: u8;
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const FIELD_TYPE: Type;
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fn count(&self) -> usize;
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fn bytes(&self) -> usize {
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self.count() * usize::from(Self::BYTE_LEN)
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}
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/// Access this value as an contiguous sequence of bytes.
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/// If their is no trivial representation, allocate it on the heap.
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fn data(&self) -> Cow<'_, [u8]>;
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/// Write this value to a TiffWriter.
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/// While the default implementation will work in all cases, it may require unnecessary allocations.
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/// The written bytes of any custom implementation MUST be the same as yielded by `self.data()`.
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fn write<W: Write>(&self, writer: &mut TiffWriter<W>) -> TiffResult<()> {
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writer.write_bytes(&self.data())?;
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Ok(())
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}
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}
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impl TiffValue for [u8] {
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const BYTE_LEN: u8 = 1;
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const FIELD_TYPE: Type = Type::BYTE;
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fn count(&self) -> usize {
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self.len()
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}
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fn data(&self) -> Cow<'_, [u8]> {
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Cow::Borrowed(self)
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}
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}
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impl TiffValue for [i8] {
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const BYTE_LEN: u8 = 1;
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const FIELD_TYPE: Type = Type::SBYTE;
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fn count(&self) -> usize {
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self.len()
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}
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fn data(&self) -> Cow<'_, [u8]> {
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Cow::Borrowed(bytecast::i8_as_ne_bytes(self))
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}
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}
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impl TiffValue for [u16] {
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const BYTE_LEN: u8 = 2;
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const FIELD_TYPE: Type = Type::SHORT;
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fn count(&self) -> usize {
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self.len()
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}
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fn data(&self) -> Cow<'_, [u8]> {
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Cow::Borrowed(bytecast::u16_as_ne_bytes(self))
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}
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}
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impl TiffValue for [i16] {
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const BYTE_LEN: u8 = 2;
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const FIELD_TYPE: Type = Type::SSHORT;
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fn count(&self) -> usize {
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self.len()
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}
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fn data(&self) -> Cow<'_, [u8]> {
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Cow::Borrowed(bytecast::i16_as_ne_bytes(self))
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}
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}
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impl TiffValue for [u32] {
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const BYTE_LEN: u8 = 4;
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const FIELD_TYPE: Type = Type::LONG;
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fn count(&self) -> usize {
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self.len()
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}
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fn data(&self) -> Cow<'_, [u8]> {
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Cow::Borrowed(bytecast::u32_as_ne_bytes(self))
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}
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}
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impl TiffValue for [i32] {
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const BYTE_LEN: u8 = 4;
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const FIELD_TYPE: Type = Type::SLONG;
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fn count(&self) -> usize {
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self.len()
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}
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fn data(&self) -> Cow<'_, [u8]> {
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Cow::Borrowed(bytecast::i32_as_ne_bytes(self))
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}
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}
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impl TiffValue for [u64] {
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const BYTE_LEN: u8 = 8;
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const FIELD_TYPE: Type = Type::LONG8;
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fn count(&self) -> usize {
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self.len()
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}
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fn data(&self) -> Cow<'_, [u8]> {
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Cow::Borrowed(bytecast::u64_as_ne_bytes(self))
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}
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}
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impl TiffValue for [i64] {
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const BYTE_LEN: u8 = 8;
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const FIELD_TYPE: Type = Type::SLONG8;
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fn count(&self) -> usize {
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self.len()
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}
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fn data(&self) -> Cow<'_, [u8]> {
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Cow::Borrowed(bytecast::i64_as_ne_bytes(self))
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}
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}
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impl TiffValue for [f32] {
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const BYTE_LEN: u8 = 4;
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const FIELD_TYPE: Type = Type::FLOAT;
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fn count(&self) -> usize {
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self.len()
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}
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fn data(&self) -> Cow<'_, [u8]> {
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// We write using native endian so this should be safe
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Cow::Borrowed(bytecast::f32_as_ne_bytes(self))
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}
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}
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impl TiffValue for [f64] {
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const BYTE_LEN: u8 = 8;
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const FIELD_TYPE: Type = Type::DOUBLE;
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fn count(&self) -> usize {
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self.len()
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}
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fn data(&self) -> Cow<'_, [u8]> {
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// We write using native endian so this should be safe
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Cow::Borrowed(bytecast::f64_as_ne_bytes(self))
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}
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}
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impl TiffValue for u8 {
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const BYTE_LEN: u8 = 1;
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const FIELD_TYPE: Type = Type::BYTE;
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fn count(&self) -> usize {
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1
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}
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fn write<W: Write>(&self, writer: &mut TiffWriter<W>) -> TiffResult<()> {
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writer.write_u8(*self)?;
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Ok(())
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}
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fn data(&self) -> Cow<'_, [u8]> {
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Cow::Borrowed(from_ref(self))
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}
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}
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impl TiffValue for i8 {
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const BYTE_LEN: u8 = 1;
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const FIELD_TYPE: Type = Type::SBYTE;
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fn count(&self) -> usize {
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1
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}
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fn write<W: Write>(&self, writer: &mut TiffWriter<W>) -> TiffResult<()> {
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writer.write_i8(*self)?;
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Ok(())
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}
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fn data(&self) -> Cow<'_, [u8]> {
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Cow::Borrowed(bytecast::i8_as_ne_bytes(from_ref(self)))
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}
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}
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impl TiffValue for u16 {
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const BYTE_LEN: u8 = 2;
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const FIELD_TYPE: Type = Type::SHORT;
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fn count(&self) -> usize {
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1
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}
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fn write<W: Write>(&self, writer: &mut TiffWriter<W>) -> TiffResult<()> {
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writer.write_u16(*self)?;
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Ok(())
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}
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fn data(&self) -> Cow<'_, [u8]> {
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Cow::Borrowed(bytecast::u16_as_ne_bytes(from_ref(self)))
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}
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}
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impl TiffValue for i16 {
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const BYTE_LEN: u8 = 2;
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const FIELD_TYPE: Type = Type::SSHORT;
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fn count(&self) -> usize {
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1
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}
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fn write<W: Write>(&self, writer: &mut TiffWriter<W>) -> TiffResult<()> {
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writer.write_i16(*self)?;
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Ok(())
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}
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fn data(&self) -> Cow<'_, [u8]> {
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Cow::Borrowed(bytecast::i16_as_ne_bytes(from_ref(self)))
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}
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}
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impl TiffValue for u32 {
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const BYTE_LEN: u8 = 4;
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const FIELD_TYPE: Type = Type::LONG;
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fn count(&self) -> usize {
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1
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}
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fn write<W: Write>(&self, writer: &mut TiffWriter<W>) -> TiffResult<()> {
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writer.write_u32(*self)?;
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Ok(())
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}
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fn data(&self) -> Cow<'_, [u8]> {
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Cow::Borrowed(bytecast::u32_as_ne_bytes(from_ref(self)))
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}
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}
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impl TiffValue for i32 {
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const BYTE_LEN: u8 = 4;
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const FIELD_TYPE: Type = Type::SLONG;
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fn count(&self) -> usize {
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1
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}
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fn write<W: Write>(&self, writer: &mut TiffWriter<W>) -> TiffResult<()> {
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writer.write_i32(*self)?;
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Ok(())
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}
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fn data(&self) -> Cow<'_, [u8]> {
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Cow::Borrowed(bytecast::i32_as_ne_bytes(from_ref(self)))
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}
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}
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impl TiffValue for u64 {
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const BYTE_LEN: u8 = 8;
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const FIELD_TYPE: Type = Type::LONG8;
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fn count(&self) -> usize {
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1
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}
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fn write<W: Write>(&self, writer: &mut TiffWriter<W>) -> TiffResult<()> {
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writer.write_u64(*self)?;
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Ok(())
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}
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fn data(&self) -> Cow<'_, [u8]> {
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Cow::Borrowed(bytecast::u64_as_ne_bytes(from_ref(self)))
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}
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}
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impl TiffValue for i64 {
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const BYTE_LEN: u8 = 8;
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const FIELD_TYPE: Type = Type::SLONG8;
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fn count(&self) -> usize {
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1
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}
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fn write<W: Write>(&self, writer: &mut TiffWriter<W>) -> TiffResult<()> {
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writer.write_i64(*self)?;
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Ok(())
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}
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fn data(&self) -> Cow<'_, [u8]> {
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Cow::Borrowed(bytecast::i64_as_ne_bytes(from_ref(self)))
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}
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}
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impl TiffValue for f32 {
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const BYTE_LEN: u8 = 4;
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const FIELD_TYPE: Type = Type::FLOAT;
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fn count(&self) -> usize {
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1
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}
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fn write<W: Write>(&self, writer: &mut TiffWriter<W>) -> TiffResult<()> {
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writer.write_f32(*self)?;
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Ok(())
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}
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fn data(&self) -> Cow<'_, [u8]> {
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Cow::Borrowed(bytecast::f32_as_ne_bytes(from_ref(self)))
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}
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}
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impl TiffValue for f64 {
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const BYTE_LEN: u8 = 8;
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const FIELD_TYPE: Type = Type::DOUBLE;
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fn count(&self) -> usize {
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1
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}
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fn write<W: Write>(&self, writer: &mut TiffWriter<W>) -> TiffResult<()> {
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writer.write_f64(*self)?;
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Ok(())
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}
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fn data(&self) -> Cow<'_, [u8]> {
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Cow::Borrowed(bytecast::f64_as_ne_bytes(from_ref(self)))
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}
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}
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impl TiffValue for Ifd {
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const BYTE_LEN: u8 = 4;
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const FIELD_TYPE: Type = Type::IFD;
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fn count(&self) -> usize {
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1
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}
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fn write<W: Write>(&self, writer: &mut TiffWriter<W>) -> TiffResult<()> {
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writer.write_u32(self.0)?;
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Ok(())
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}
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fn data(&self) -> Cow<'_, [u8]> {
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Cow::Borrowed(bytecast::u32_as_ne_bytes(from_ref(&self.0)))
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}
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}
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impl TiffValue for Ifd8 {
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const BYTE_LEN: u8 = 8;
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const FIELD_TYPE: Type = Type::IFD8;
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fn count(&self) -> usize {
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1
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}
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fn write<W: Write>(&self, writer: &mut TiffWriter<W>) -> TiffResult<()> {
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writer.write_u64(self.0)?;
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Ok(())
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}
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fn data(&self) -> Cow<'_, [u8]> {
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Cow::Borrowed(bytecast::u64_as_ne_bytes(from_ref(&self.0)))
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}
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}
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impl TiffValue for Rational {
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const BYTE_LEN: u8 = 8;
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const FIELD_TYPE: Type = Type::RATIONAL;
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fn count(&self) -> usize {
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1
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}
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fn write<W: Write>(&self, writer: &mut TiffWriter<W>) -> TiffResult<()> {
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writer.write_u32(self.n)?;
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writer.write_u32(self.d)?;
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Ok(())
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}
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fn data(&self) -> Cow<'_, [u8]> {
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Cow::Owned({
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let first_dword = bytecast::u32_as_ne_bytes(from_ref(&self.n));
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let second_dword = bytecast::u32_as_ne_bytes(from_ref(&self.d));
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[first_dword, second_dword].concat()
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})
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}
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}
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impl TiffValue for SRational {
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const BYTE_LEN: u8 = 8;
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const FIELD_TYPE: Type = Type::SRATIONAL;
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fn count(&self) -> usize {
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1
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}
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fn write<W: Write>(&self, writer: &mut TiffWriter<W>) -> TiffResult<()> {
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writer.write_i32(self.n)?;
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writer.write_i32(self.d)?;
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Ok(())
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}
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fn data(&self) -> Cow<'_, [u8]> {
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Cow::Owned({
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let first_dword = bytecast::i32_as_ne_bytes(from_ref(&self.n));
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let second_dword = bytecast::i32_as_ne_bytes(from_ref(&self.d));
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[first_dword, second_dword].concat()
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})
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}
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}
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impl TiffValue for str {
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const BYTE_LEN: u8 = 1;
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const FIELD_TYPE: Type = Type::ASCII;
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fn count(&self) -> usize {
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self.len() + 1
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}
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fn write<W: Write>(&self, writer: &mut TiffWriter<W>) -> TiffResult<()> {
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if self.is_ascii() && !self.bytes().any(|b| b == 0) {
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writer.write_bytes(self.as_bytes())?;
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writer.write_u8(0)?;
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Ok(())
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} else {
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Err(TiffError::FormatError(TiffFormatError::InvalidTag))
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}
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}
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fn data(&self) -> Cow<'_, [u8]> {
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Cow::Owned({
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if self.is_ascii() && !self.bytes().any(|b| b == 0) {
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let bytes: &[u8] = self.as_bytes();
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[bytes, &[0]].concat()
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} else {
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vec![]
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}
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})
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}
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}
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impl<T: TiffValue + ?Sized> TiffValue for &'_ T {
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const BYTE_LEN: u8 = T::BYTE_LEN;
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const FIELD_TYPE: Type = T::FIELD_TYPE;
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fn count(&self) -> usize {
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(*self).count()
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}
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fn write<W: Write>(&self, writer: &mut TiffWriter<W>) -> TiffResult<()> {
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(*self).write(writer)
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}
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fn data(&self) -> Cow<'_, [u8]> {
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T::data(self)
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}
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}
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macro_rules! impl_tiff_value_for_contiguous_sequence {
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($inner_type:ty; $bytes:expr; $field_type:expr) => {
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impl $crate::encoder::TiffValue for [$inner_type] {
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const BYTE_LEN: u8 = $bytes;
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const FIELD_TYPE: Type = $field_type;
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fn count(&self) -> usize {
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self.len()
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}
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fn write<W: Write>(&self, writer: &mut TiffWriter<W>) -> TiffResult<()> {
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for x in self {
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x.write(writer)?;
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}
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Ok(())
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}
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fn data(&self) -> Cow<'_, [u8]> {
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let mut buf: Vec<u8> = Vec::with_capacity(Self::BYTE_LEN as usize * self.len());
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for x in self {
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buf.extend_from_slice(&x.data());
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}
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Cow::Owned(buf)
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}
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}
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};
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}
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impl_tiff_value_for_contiguous_sequence!(Ifd; 4; Type::IFD);
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impl_tiff_value_for_contiguous_sequence!(Ifd8; 8; Type::IFD8);
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impl_tiff_value_for_contiguous_sequence!(Rational; 8; Type::RATIONAL);
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impl_tiff_value_for_contiguous_sequence!(SRational; 8; Type::SRATIONAL);
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/// Type to represent tiff values of type `IFD`
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#[derive(Clone)]
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pub struct Ifd(pub u32);
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/// Type to represent tiff values of type `IFD8`
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#[derive(Clone)]
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pub struct Ifd8(pub u64);
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/// Type to represent tiff values of type `RATIONAL`
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#[derive(Clone)]
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pub struct Rational {
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pub n: u32,
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pub d: u32,
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}
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/// Type to represent tiff values of type `SRATIONAL`
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#[derive(Clone)]
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pub struct SRational {
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pub n: i32,
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pub d: i32,
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}
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