1use poulpy_hal::{
  2    api::{VecZnxCopy, VecZnxFillUniform},
  3    layouts::{
  4        Backend, Data, DataMut, DataRef, FillUniform, MatZnx, MatZnxToMut, MatZnxToRef, Module, ReaderFrom, WriterTo, ZnxInfos,
  5    },
  6    source::Source,
  7};
  8
  9use crate::layouts::{
 10    Base2K, Degree, Dnum, Dsize, GGLWE, GGLWEInfos, GGLWEToMut, GLWEInfos, GetDegree, LWEInfos, Rank, TorusPrecision,
 11    compressed::{GLWECompressed, GLWEDecompress},
 12};
 13use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
 14use std::fmt;
 15
 16#[derive(PartialEq, Eq, Clone)]
 17pub struct GGLWECompressed<D: Data> {
 18    pub(crate) data: MatZnx<D>,
 19    pub(crate) base2k: Base2K,
 20    pub(crate) k: TorusPrecision,
 21    pub(crate) rank_out: Rank,
 22    pub(crate) dsize: Dsize,
 23    pub(crate) seed: Vec<[u8; 32]>,
 24}
 25
 26impl<D: Data> LWEInfos for GGLWECompressed<D> {
 27    fn n(&self) -> Degree {
 28        Degree(self.data.n() as u32)
 29    }
 30
 31    fn base2k(&self) -> Base2K {
 32        self.base2k
 33    }
 34
 35    fn k(&self) -> TorusPrecision {
 36        self.k
 37    }
 38
 39    fn size(&self) -> usize {
 40        self.data.size()
 41    }
 42}
 43impl<D: Data> GLWEInfos for GGLWECompressed<D> {
 44    fn rank(&self) -> Rank {
 45        self.rank_out()
 46    }
 47}
 48
 49impl<D: Data> GGLWEInfos for GGLWECompressed<D> {
 50    fn rank_in(&self) -> Rank {
 51        Rank(self.data.cols_in() as u32)
 52    }
 53
 54    fn rank_out(&self) -> Rank {
 55        self.rank_out
 56    }
 57
 58    fn dsize(&self) -> Dsize {
 59        self.dsize
 60    }
 61
 62    fn dnum(&self) -> Dnum {
 63        Dnum(self.data.rows() as u32)
 64    }
 65}
 66
 67impl<D: DataRef> fmt::Debug for GGLWECompressed<D> {
 68    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 69        write!(f, "{self}")
 70    }
 71}
 72
 73impl<D: DataMut> FillUniform for GGLWECompressed<D> {
 74    fn fill_uniform(&mut self, log_bound: usize, source: &mut Source) {
 75        self.data.fill_uniform(log_bound, source);
 76    }
 77}
 78
 79impl<D: DataRef> fmt::Display for GGLWECompressed<D> {
 80    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 81        write!(
 82            f,
 83            "(GGLWECompressed: base2k={} k={} dsize={}) {}",
 84            self.base2k.0, self.k.0, self.dsize.0, self.data
 85        )
 86    }
 87}
 88
 89pub trait GGLWECompressedAlloc
 90where
 91    Self: GetDegree,
 92{
 93    fn alloc_gglwe_compressed(
 94        &self,
 95        base2k: Base2K,
 96        k: TorusPrecision,
 97        rank_in: Rank,
 98        rank_out: Rank,
 99        dnum: Dnum,
100        dsize: Dsize,
101    ) -> GGLWECompressed<Vec<u8>> {
102        let size: usize = k.0.div_ceil(base2k.0) as usize;
103        debug_assert!(
104            size as u32 > dsize.0,
105            "invalid gglwe: ceil(k/base2k): {size} <= dsize: {}",
106            dsize.0
107        );
108
109        assert!(
110            dnum.0 * dsize.0 <= size as u32,
111            "invalid gglwe: dnum: {} * dsize:{} > ceil(k/base2k): {size}",
112            dnum.0,
113            dsize.0,
114        );
115
116        GGLWECompressed {
117            data: MatZnx::alloc(
118                self.n().into(),
119                dnum.into(),
120                rank_in.into(),
121                1,
122                k.0.div_ceil(base2k.0) as usize,
123            ),
124            k,
125            base2k,
126            dsize,
127            rank_out,
128            seed: vec![[0u8; 32]; (dnum.0 * rank_in.0) as usize],
129        }
130    }
131
132    fn alloc_gglwe_compressed_from_infos<A>(&self, infos: &A) -> GGLWECompressed<Vec<u8>>
133    where
134        A: GGLWEInfos,
135    {
136        assert_eq!(infos.n(), self.n());
137        self.alloc_gglwe_compressed(
138            infos.base2k(),
139            infos.k(),
140            infos.rank_in(),
141            infos.rank_out(),
142            infos.dnum(),
143            infos.dsize(),
144        )
145    }
146
147    fn bytes_of_gglwe_compressed(&self, base2k: Base2K, k: TorusPrecision, rank_in: Rank, dnum: Dnum, dsize: Dsize) -> usize {
148        let size: usize = k.0.div_ceil(base2k.0) as usize;
149        debug_assert!(
150            size as u32 > dsize.0,
151            "invalid gglwe: ceil(k/base2k): {size} <= dsize: {}",
152            dsize.0
153        );
154
155        assert!(
156            dnum.0 * dsize.0 <= size as u32,
157            "invalid gglwe: dnum: {} * dsize:{} > ceil(k/base2k): {size}",
158            dnum.0,
159            dsize.0,
160        );
161
162        MatZnx::bytes_of(
163            self.n().into(),
164            dnum.into(),
165            rank_in.into(),
166            1,
167            k.0.div_ceil(base2k.0) as usize,
168        )
169    }
170
171    fn bytes_of_gglwe_compressed_from_infos<A>(&self, infos: &A) -> usize
172    where
173        A: GGLWEInfos,
174    {
175        assert_eq!(infos.n(), self.n());
176        self.bytes_of_gglwe_compressed(
177            infos.base2k(),
178            infos.k(),
179            infos.rank_in(),
180            infos.dnum(),
181            infos.dsize(),
182        )
183    }
184}
185
186impl<B: Backend> GGLWECompressedAlloc for Module<B> where Self: GetDegree {}
187
188impl GGLWECompressed<Vec<u8>> {
189    pub fn alloc_from_infos<A, B: Backend>(module: &Module<B>, infos: &A) -> Self
190    where
191        A: GGLWEInfos,
192        Module<B>: GGLWECompressedAlloc,
193    {
194        module.alloc_gglwe_compressed_from_infos(infos)
195    }
196
197    pub fn alloc<B: Backend>(
198        module: &Module<B>,
199        base2k: Base2K,
200        k: TorusPrecision,
201        rank_in: Rank,
202        rank_out: Rank,
203        dnum: Dnum,
204        dsize: Dsize,
205    ) -> Self
206    where
207        Module<B>: GGLWECompressedAlloc,
208    {
209        module.alloc_gglwe_compressed(base2k, k, rank_in, rank_out, dnum, dsize)
210    }
211
212    pub fn bytes_of_from_infos<A, B: Backend>(module: &Module<B>, infos: &A) -> usize
213    where
214        A: GGLWEInfos,
215        Module<B>: GGLWECompressedAlloc,
216    {
217        module.bytes_of_gglwe_compressed_from_infos(infos)
218    }
219
220    pub fn byte_of<B: Backend>(
221        module: &Module<B>,
222        base2k: Base2K,
223        k: TorusPrecision,
224        rank_in: Rank,
225        dnum: Dnum,
226        dsize: Dsize,
227    ) -> usize
228    where
229        Module<B>: GGLWECompressedAlloc,
230    {
231        module.bytes_of_gglwe_compressed(base2k, k, rank_in, dnum, dsize)
232    }
233}
234
235impl<D: DataRef> GGLWECompressed<D> {
236    pub(crate) fn at(&self, row: usize, col: usize) -> GLWECompressed<&[u8]> {
237        let rank_in: usize = self.rank_in().into();
238        GLWECompressed {
239            data: self.data.at(row, col),
240            k: self.k,
241            base2k: self.base2k,
242            rank: self.rank_out,
243            seed: self.seed[rank_in * row + col],
244        }
245    }
246}
247
248impl<D: DataMut> GGLWECompressed<D> {
249    pub(crate) fn at_mut(&mut self, row: usize, col: usize) -> GLWECompressed<&mut [u8]> {
250        let rank_in: usize = self.rank_in().into();
251        GLWECompressed {
252            k: self.k,
253            base2k: self.base2k,
254            rank: self.rank_out,
255            data: self.data.at_mut(row, col),
256            seed: self.seed[rank_in * row + col], // Warning: value is copied and not borrow mut
257        }
258    }
259}
260
261impl<D: DataMut> ReaderFrom for GGLWECompressed<D> {
262    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
263        self.k = TorusPrecision(reader.read_u32::<LittleEndian>()?);
264        self.base2k = Base2K(reader.read_u32::<LittleEndian>()?);
265        self.dsize = Dsize(reader.read_u32::<LittleEndian>()?);
266        self.rank_out = Rank(reader.read_u32::<LittleEndian>()?);
267        let seed_len: u32 = reader.read_u32::<LittleEndian>()?;
268        self.seed = vec![[0u8; 32]; seed_len as usize];
269        for s in &mut self.seed {
270            reader.read_exact(s)?;
271        }
272        self.data.read_from(reader)
273    }
274}
275
276impl<D: DataRef> WriterTo for GGLWECompressed<D> {
277    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
278        writer.write_u32::<LittleEndian>(self.k.into())?;
279        writer.write_u32::<LittleEndian>(self.base2k.into())?;
280        writer.write_u32::<LittleEndian>(self.dsize.into())?;
281        writer.write_u32::<LittleEndian>(self.rank_out.into())?;
282        writer.write_u32::<LittleEndian>(self.seed.len() as u32)?;
283        for s in &self.seed {
284            writer.write_all(s)?;
285        }
286        self.data.write_to(writer)
287    }
288}
289
290pub trait GGLWEDecompress
291where
292    Self: GLWEDecompress,
293{
294    fn decompress_gglwe<R, O>(&self, res: &mut R, other: &O)
295    where
296        R: GGLWEToMut,
297        O: GGLWECompressedToRef,
298    {
299        let res: &mut GGLWE<&mut [u8]> = &mut res.to_mut();
300        let other: &GGLWECompressed<&[u8]> = &other.to_ref();
301
302        assert_eq!(res.gglwe_layout(), other.gglwe_layout());
303
304        let rank_in: usize = res.rank_in().into();
305        let dnum: usize = res.dnum().into();
306
307        for row_i in 0..dnum {
308            for col_i in 0..rank_in {
309                self.decompress_glwe(&mut res.at_mut(row_i, col_i), &other.at(row_i, col_i));
310            }
311        }
312    }
313}
314
315impl<B: Backend> GGLWEDecompress for Module<B> where Self: VecZnxFillUniform + VecZnxCopy {}
316
317impl<D: DataMut> GGLWE<D> {
318    pub fn decompress<O, B: Backend>(&mut self, module: &Module<B>, other: &O)
319    where
320        O: GGLWECompressedToRef,
321        Module<B>: GGLWEDecompress,
322    {
323        module.decompress_gglwe(self, other);
324    }
325}
326
327pub trait GGLWECompressedToMut {
328    fn to_mut(&mut self) -> GGLWECompressed<&mut [u8]>;
329}
330
331impl<D: DataMut> GGLWECompressedToMut for GGLWECompressed<D> {
332    fn to_mut(&mut self) -> GGLWECompressed<&mut [u8]> {
333        GGLWECompressed {
334            k: self.k(),
335            base2k: self.base2k(),
336            dsize: self.dsize(),
337            seed: self.seed.clone(),
338            rank_out: self.rank_out,
339            data: self.data.to_mut(),
340        }
341    }
342}
343
344pub trait GGLWECompressedToRef {
345    fn to_ref(&self) -> GGLWECompressed<&[u8]>;
346}
347
348impl<D: DataRef> GGLWECompressedToRef for GGLWECompressed<D> {
349    fn to_ref(&self) -> GGLWECompressed<&[u8]> {
350        GGLWECompressed {
351            k: self.k(),
352            base2k: self.base2k(),
353            dsize: self.dsize(),
354            seed: self.seed.clone(),
355            rank_out: self.rank_out,
356            data: self.data.to_ref(),
357        }
358    }
359}