1 files changed, 41 insertions, 0 deletions
diff --git a/vendor/exr/src/compression/zip.rs b/vendor/exr/src/compression/zip.rs
new file mode 100644
index 0000000..0e9899c
--- /dev/null
+++ b/vendor/exr/src/compression/zip.rs
@@ -0,0 +1,41 @@
+
+// see https://github.com/openexr/openexr/blob/master/OpenEXR/IlmImf/ImfCompressor.cpp
+
+
+use super::*;
+use super::optimize_bytes::*;
+use crate::error::Result;
+
+// scanline decompression routine, see https://github.com/openexr/openexr/blob/master/OpenEXR/IlmImf/ImfScanLineInputFile.cpp
+// 1. Uncompress the data, if necessary (If the line is uncompressed, it's in XDR format, regardless of the compressor's output format.)
+// 3. Convert one scan line's worth of pixel data back from the machine-independent representation
+// 4. Fill the frame buffer with pixel data, respective to sampling and whatnot
+
+
+pub fn decompress_bytes(
+    channels: &ChannelList,
+    data: ByteVec,
+    rectangle: IntegerBounds,
+    expected_byte_size: usize,
+    _pedantic: bool,
+) -> Result<ByteVec> {
+    let options = zune_inflate::DeflateOptions::default().set_limit(expected_byte_size).set_size_hint(expected_byte_size);
+    let mut decoder = zune_inflate::DeflateDecoder::new_with_options(&data, options);
+    let mut decompressed = decoder.decode_zlib()
+        .map_err(|_| Error::invalid("zlib-compressed data malformed"))?;
+
+    differences_to_samples(&mut decompressed);
+    interleave_byte_blocks(&mut decompressed);
+
+    Ok(super::convert_little_endian_to_current(decompressed, channels, rectangle))// TODO no alloc
+}
+
+pub fn compress_bytes(channels: &ChannelList, uncompressed: ByteVec, rectangle: IntegerBounds) -> Result<ByteVec> {
+    // see https://github.com/AcademySoftwareFoundation/openexr/blob/3bd93f85bcb74c77255f28cdbb913fdbfbb39dfe/OpenEXR/IlmImf/ImfTiledOutputFile.cpp#L750-L842
+    let mut packed = convert_current_to_little_endian(uncompressed, channels, rectangle);
+
+    separate_bytes_fragments(&mut packed);
+    samples_to_differences(&mut packed);
+
+    Ok(miniz_oxide::deflate::compress_to_vec_zlib(packed.as_slice(), 4))
+}