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
 26pub trait GGLWECompressedSeedMut {
 27    fn seed_mut(&mut self) -> &mut Vec<[u8; 32]>;
 28}
 29
 30impl<D: DataMut> GGLWECompressedSeedMut for GGLWECompressed<D> {
 31    fn seed_mut(&mut self) -> &mut Vec<[u8; 32]> {
 32        &mut self.seed
 33    }
 34}
 35
 36pub trait GGLWECompressedSeed {
 37    fn seed(&self) -> &Vec<[u8; 32]>;
 38}
 39
 40impl<D: DataRef> GGLWECompressedSeed for GGLWECompressed<D> {
 41    fn seed(&self) -> &Vec<[u8; 32]> {
 42        &self.seed
 43    }
 44}
 45impl<D: Data> LWEInfos for GGLWECompressed<D> {
 46    fn n(&self) -> Degree {
 47        Degree(self.data.n() as u32)
 48    }
 49
 50    fn base2k(&self) -> Base2K {
 51        self.base2k
 52    }
 53
 54    fn k(&self) -> TorusPrecision {
 55        self.k
 56    }
 57
 58    fn size(&self) -> usize {
 59        self.data.size()
 60    }
 61}
 62impl<D: Data> GLWEInfos for GGLWECompressed<D> {
 63    fn rank(&self) -> Rank {
 64        self.rank_out()
 65    }
 66}
 67
 68impl<D: Data> GGLWEInfos for GGLWECompressed<D> {
 69    fn rank_in(&self) -> Rank {
 70        Rank(self.data.cols_in() as u32)
 71    }
 72
 73    fn rank_out(&self) -> Rank {
 74        self.rank_out
 75    }
 76
 77    fn dsize(&self) -> Dsize {
 78        self.dsize
 79    }
 80
 81    fn dnum(&self) -> Dnum {
 82        Dnum(self.data.rows() as u32)
 83    }
 84}
 85
 86impl<D: DataRef> fmt::Debug for GGLWECompressed<D> {
 87    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 88        write!(f, "{self}")
 89    }
 90}
 91
 92impl<D: DataMut> FillUniform for GGLWECompressed<D> {
 93    fn fill_uniform(&mut self, log_bound: usize, source: &mut Source) {
 94        self.data.fill_uniform(log_bound, source);
 95    }
 96}
 97
 98impl<D: DataRef> fmt::Display for GGLWECompressed<D> {
 99    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
100        write!(
101            f,
102            "(GGLWECompressed: base2k={} k={} dsize={}) {}",
103            self.base2k.0, self.k.0, self.dsize.0, self.data
104        )
105    }
106}
107
108pub trait GGLWECompressedAlloc
109where
110    Self: GetDegree,
111{
112    fn alloc_gglwe_compressed(
113        &self,
114        base2k: Base2K,
115        k: TorusPrecision,
116        rank_in: Rank,
117        rank_out: Rank,
118        dnum: Dnum,
119        dsize: Dsize,
120    ) -> GGLWECompressed<Vec<u8>> {
121        let size: usize = k.0.div_ceil(base2k.0) as usize;
122        debug_assert!(
123            size as u32 > dsize.0,
124            "invalid gglwe: ceil(k/base2k): {size} <= dsize: {}",
125            dsize.0
126        );
127
128        assert!(
129            dnum.0 * dsize.0 <= size as u32,
130            "invalid gglwe: dnum: {} * dsize:{} > ceil(k/base2k): {size}",
131            dnum.0,
132            dsize.0,
133        );
134
135        GGLWECompressed {
136            data: MatZnx::alloc(
137                self.ring_degree().into(),
138                dnum.into(),
139                rank_in.into(),
140                1,
141                k.0.div_ceil(base2k.0) as usize,
142            ),
143            k,
144            base2k,
145            dsize,
146            rank_out,
147            seed: vec![[0u8; 32]; (dnum.0 * rank_in.0) as usize],
148        }
149    }
150
151    fn alloc_gglwe_compressed_from_infos<A>(&self, infos: &A) -> GGLWECompressed<Vec<u8>>
152    where
153        A: GGLWEInfos,
154    {
155        assert_eq!(infos.n(), self.ring_degree());
156        self.alloc_gglwe_compressed(
157            infos.base2k(),
158            infos.k(),
159            infos.rank_in(),
160            infos.rank_out(),
161            infos.dnum(),
162            infos.dsize(),
163        )
164    }
165
166    fn bytes_of_gglwe_compressed(&self, base2k: Base2K, k: TorusPrecision, rank_in: Rank, dnum: Dnum, dsize: Dsize) -> usize {
167        let size: usize = k.0.div_ceil(base2k.0) as usize;
168        debug_assert!(
169            size as u32 > dsize.0,
170            "invalid gglwe: ceil(k/base2k): {size} <= dsize: {}",
171            dsize.0
172        );
173
174        assert!(
175            dnum.0 * dsize.0 <= size as u32,
176            "invalid gglwe: dnum: {} * dsize:{} > ceil(k/base2k): {size}",
177            dnum.0,
178            dsize.0,
179        );
180
181        MatZnx::bytes_of(
182            self.ring_degree().into(),
183            dnum.into(),
184            rank_in.into(),
185            1,
186            k.0.div_ceil(base2k.0) as usize,
187        )
188    }
189
190    fn bytes_of_gglwe_compressed_from_infos<A>(&self, infos: &A) -> usize
191    where
192        A: GGLWEInfos,
193    {
194        assert_eq!(infos.n(), self.ring_degree());
195        self.bytes_of_gglwe_compressed(
196            infos.base2k(),
197            infos.k(),
198            infos.rank_in(),
199            infos.dnum(),
200            infos.dsize(),
201        )
202    }
203}
204
205impl<B: Backend> GGLWECompressedAlloc for Module<B> where Self: GetDegree {}
206
207impl GGLWECompressed<Vec<u8>> {
208    pub fn alloc_from_infos<A, M>(module: &M, infos: &A) -> Self
209    where
210        A: GGLWEInfos,
211        M: GGLWECompressedAlloc,
212    {
213        module.alloc_gglwe_compressed_from_infos(infos)
214    }
215
216    pub fn alloc<M>(
217        module: &M,
218        base2k: Base2K,
219        k: TorusPrecision,
220        rank_in: Rank,
221        rank_out: Rank,
222        dnum: Dnum,
223        dsize: Dsize,
224    ) -> Self
225    where
226        M: GGLWECompressedAlloc,
227    {
228        module.alloc_gglwe_compressed(base2k, k, rank_in, rank_out, dnum, dsize)
229    }
230
231    pub fn bytes_of_from_infos<A, M>(module: &M, infos: &A) -> usize
232    where
233        A: GGLWEInfos,
234        M: GGLWECompressedAlloc,
235    {
236        module.bytes_of_gglwe_compressed_from_infos(infos)
237    }
238
239    pub fn byte_of<M>(module: &M, base2k: Base2K, k: TorusPrecision, rank_in: Rank, dnum: Dnum, dsize: Dsize) -> usize
240    where
241        M: GGLWECompressedAlloc,
242    {
243        module.bytes_of_gglwe_compressed(base2k, k, rank_in, dnum, dsize)
244    }
245}
246
247impl<D: DataRef> GGLWECompressed<D> {
248    pub(crate) fn at(&self, row: usize, col: usize) -> GLWECompressed<&[u8]> {
249        let rank_in: usize = self.rank_in().into();
250        GLWECompressed {
251            data: self.data.at(row, col),
252            k: self.k,
253            base2k: self.base2k,
254            rank: self.rank_out,
255            seed: self.seed[rank_in * row + col],
256        }
257    }
258}
259
260impl<D: DataMut> GGLWECompressed<D> {
261    pub(crate) fn at_mut(&mut self, row: usize, col: usize) -> GLWECompressed<&mut [u8]> {
262        let rank_in: usize = self.rank_in().into();
263        GLWECompressed {
264            k: self.k,
265            base2k: self.base2k,
266            rank: self.rank_out,
267            data: self.data.at_mut(row, col),
268            seed: self.seed[rank_in * row + col], // Warning: value is copied and not borrow mut
269        }
270    }
271}
272
273impl<D: DataMut> ReaderFrom for GGLWECompressed<D> {
274    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
275        self.k = TorusPrecision(reader.read_u32::<LittleEndian>()?);
276        self.base2k = Base2K(reader.read_u32::<LittleEndian>()?);
277        self.dsize = Dsize(reader.read_u32::<LittleEndian>()?);
278        self.rank_out = Rank(reader.read_u32::<LittleEndian>()?);
279        let seed_len: u32 = reader.read_u32::<LittleEndian>()?;
280        self.seed = vec![[0u8; 32]; seed_len as usize];
281        for s in &mut self.seed {
282            reader.read_exact(s)?;
283        }
284        self.data.read_from(reader)
285    }
286}
287
288impl<D: DataRef> WriterTo for GGLWECompressed<D> {
289    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
290        writer.write_u32::<LittleEndian>(self.k.into())?;
291        writer.write_u32::<LittleEndian>(self.base2k.into())?;
292        writer.write_u32::<LittleEndian>(self.dsize.into())?;
293        writer.write_u32::<LittleEndian>(self.rank_out.into())?;
294        writer.write_u32::<LittleEndian>(self.seed.len() as u32)?;
295        for s in &self.seed {
296            writer.write_all(s)?;
297        }
298        self.data.write_to(writer)
299    }
300}
301
302pub trait GGLWEDecompress
303where
304    Self: GLWEDecompress,
305{
306    fn decompress_gglwe<R, O>(&self, res: &mut R, other: &O)
307    where
308        R: GGLWEToMut,
309        O: GGLWECompressedToRef,
310    {
311        let res: &mut GGLWE<&mut [u8]> = &mut res.to_mut();
312        let other: &GGLWECompressed<&[u8]> = &other.to_ref();
313
314        assert_eq!(res.gglwe_layout(), other.gglwe_layout());
315
316        let rank_in: usize = res.rank_in().into();
317        let dnum: usize = res.dnum().into();
318
319        for row_i in 0..dnum {
320            for col_i in 0..rank_in {
321                self.decompress_glwe(&mut res.at_mut(row_i, col_i), &other.at(row_i, col_i));
322            }
323        }
324    }
325}
326
327impl<B: Backend> GGLWEDecompress for Module<B> where Self: VecZnxFillUniform + VecZnxCopy {}
328
329impl<D: DataMut> GGLWE<D> {
330    pub fn decompress<O, M>(&mut self, module: &M, other: &O)
331    where
332        O: GGLWECompressedToRef,
333        M: GGLWEDecompress,
334    {
335        module.decompress_gglwe(self, other);
336    }
337}
338
339pub trait GGLWECompressedToMut {
340    fn to_mut(&mut self) -> GGLWECompressed<&mut [u8]>;
341}
342
343impl<D: DataMut> GGLWECompressedToMut for GGLWECompressed<D> {
344    fn to_mut(&mut self) -> GGLWECompressed<&mut [u8]> {
345        GGLWECompressed {
346            k: self.k(),
347            base2k: self.base2k(),
348            dsize: self.dsize(),
349            seed: self.seed.clone(),
350            rank_out: self.rank_out,
351            data: self.data.to_mut(),
352        }
353    }
354}
355
356pub trait GGLWECompressedToRef {
357    fn to_ref(&self) -> GGLWECompressed<&[u8]>;
358}
359
360impl<D: DataRef> GGLWECompressedToRef for GGLWECompressed<D> {
361    fn to_ref(&self) -> GGLWECompressed<&[u8]> {
362        GGLWECompressed {
363            k: self.k(),
364            base2k: self.base2k(),
365            dsize: self.dsize(),
366            seed: self.seed.clone(),
367            rank_out: self.rank_out,
368            data: self.data.to_ref(),
369        }
370    }
371}