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use crate::fits::Fits;
use crate::hdu::ExtensionHDU;
use crate::header::{BayerPattern, Bitpix};
use crate::image::{Image, ImageData};
use crate::slice_ascii_table_hdu::SliceAsciiTableHDU;
use crate::slice_bin_table_hdu::SliceBinTableHDU;
use crate::slice_image_hdu::SliceImageHDU;
use alloc::boxed::Box;
use alloc::vec;
use alloc::vec::Vec;
use std::error::Error;
/// A Fits file created from a buffer
#[derive(Debug, Clone)]
pub struct FitsSlice {
primary_hdu: SliceImageHDU,
extension_hdus: Vec<ExtensionHDU<Self>>,
}
impl FitsSlice {
/// Creates a new empty fits file
pub fn from_slice(_data: &[u8]) -> Self {
Self {
primary_hdu: SliceImageHDU {},
extension_hdus: vec![],
}
}
// pub(crate) fn parse_extension_hdus(data: &[u8]) -> Result<Vec<ExtensionHDU>, Box<dyn Error + Send + Sync>> {
// let mut offset = 0;
// let mut extension_hdus = vec![];
// while offset < data.len() {
// let header = Header::from_u8(data)?;
// let bytes_len = header.data_block_len();
// offset += header.bytes_len();
// let extension_type = header.extension().ok_or_else(|| "Missing extension type".to_string())?;
//
// match extension_type {
// ExtensionType::Image => {
// if bytes_len == 0 {
// extension_hdus.push(ExtensionHDU::Image(ImageHDU::new(header, vec![])));
// } else {
// offset += bytes_len;
// let bitpix = header.bitpix();
// let bzero = header.bzero().unwrap();
// let bscale = header.bscale().unwrap();
//
// let width = header.naxis_n(1).unwrap();
// let height = header.naxis_n(2).unwrap();
//
// let bayer_pattern = header.bayer_pattern();
//
// let image = Self::read_image(&data, header.bytes_len(), bitpix, bscale, bzero, bayer_pattern, width as usize, height as usize)?;
//
// extension_hdus.push(ExtensionHDU::Image(ImageHDU::new(header, vec![image])));
// }
// }
// ExtensionType::BinTable => {
// extension_hdus.push(ExtensionHDU::BinTable(BinTableHDU::from_u8(header, data[offset..(bytes_len + offset)].to_vec())?));
// offset += bytes_len;
// }
// ExtensionType::AsciiTable => {}
// }
// }
//
// Ok(extension_hdus)
// }
fn read_image(
data: &[u8],
offset: usize,
bitpix: Bitpix,
bscale: f64,
bzero: f64,
bayer_pattern: Option<BayerPattern>,
width: usize,
height: usize,
) -> Result<Image, Box<dyn Error + Send + Sync>> {
let bytes = bitpix.byte_size() * width * height;
let data = &data[offset..(bytes + offset)];
match bitpix {
Bitpix::F64 => {
let data = data
.as_chunks::<8>()
.0
.iter()
.map(|i| f64::from_be_bytes(*i))
.collect();
Ok(Image::F64(ImageData::from_data(
width,
height,
bzero,
bscale,
bayer_pattern,
data,
)?))
}
Bitpix::F32 => {
let data = data
.as_chunks::<4>()
.0
.iter()
.map(|i| f32::from_be_bytes(*i))
.collect();
Ok(Image::F32(ImageData::from_data(
width,
height,
bzero,
bscale,
bayer_pattern,
data,
)?))
}
Bitpix::U8 => {
let data = data.to_vec();
Ok(Image::U8(ImageData::from_data(
width,
height,
bzero,
bscale,
bayer_pattern,
data,
)?))
}
Bitpix::I16 => {
let data = data
.as_chunks::<2>()
.0
.iter()
.map(|i| i16::from_be_bytes(*i))
.collect();
Ok(Image::I16(ImageData::from_data(
width,
height,
bzero,
bscale,
bayer_pattern,
data,
)?))
}
Bitpix::I32 => {
let data = data
.as_chunks::<4>()
.0
.iter()
.map(|i| i32::from_be_bytes(*i))
.collect();
Ok(Image::I32(ImageData::from_data(
width,
height,
bzero,
bscale,
bayer_pattern,
data,
)?))
}
}
}
}
impl Fits for FitsSlice {
type ImageHDU = SliceImageHDU;
type BinTableHDU = SliceBinTableHDU;
type AsciiTableHDU = SliceAsciiTableHDU;
fn primary_hdu(&self) -> &Self::ImageHDU {
&self.primary_hdu
}
fn primary_hdu_mut(&mut self) -> &mut Self::ImageHDU {
&mut self.primary_hdu
}
fn extension_count(&mut self) -> usize {
self.extension_hdus.len()
}
fn extension_hdu(&self, index: usize) -> Option<&ExtensionHDU<Self>> {
self.extension_hdus.get(index)
}
fn extension_hdu_mut(&mut self, index: usize) -> Option<&mut ExtensionHDU<Self>> {
self.extension_hdus.get_mut(index)
}
fn extension_hdus(&self) -> impl Iterator<Item = &ExtensionHDU<Self>> {
self.extension_hdus.iter()
}
fn extension_hdus_mut(&mut self) -> impl Iterator<Item = &mut ExtensionHDU<Self>> {
self.extension_hdus.iter_mut()
}
fn to_vec(&self) -> Vec<u8> {
todo!()
}
}