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use crate::kval_enum::KVal;
use crate::enc_dec::tag_storage::TagStorage;
use std::io::Write;
use crate::enc_dec::writer::Writer;
use crate::error::ComResult;
pub fn encode<W : Write>(vec : &[KVal], write : &mut W) -> ComResult<usize>{
let mut writer = Writer::new(write);
let mut data : Vec<u8> = Vec::with_capacity(vec.len() * 2);
let mut tag = TagStorage::new();
for item in vec{
match item{
KVal::Null =>{ tag.append(0b0100_1, 5) }
KVal::Bit(b) =>{ tag.append(0b10 + *b as u64, 2) }
KVal::Bool(b) =>{ tag.append(0b0100_010 + *b as u64, 7) }
KVal::Byte(i) =>{
tag.append(0b011, 3);
data.push(*i as u8);
},
KVal::Str16(s) =>{
tag.append(0b0101, 4);
if s.len() < 16 {
tag.append(s.len() as u64, 4);
} else{
panic!("Small str's len must be within 15");
}
data.extend_from_slice(s.as_bytes());
},
KVal::Int(i) => {
let ans = super::var_int::encode(*i);
let size = ans.len();
if size == 0 || 9 <= size { unreachable!("Int's size must be 1..=8"); }
tag.append(0b0011, 4);
tag.append((size - 1) as u64, 3);
data.extend_from_slice(&ans);
},
KVal::Float(f) =>{
tag.append(0b0010_0001, 8);
data.extend_from_slice(&f.to_be_bytes());
},
KVal::Str256(s) =>{
tag.append(0b0010_1, 5);
if 256 <= s.len(){
panic!("Str256's len must be 0..=255")
}
data.push(s.len() as u8);
data.extend_from_slice(s.as_bytes());
},
KVal::Double(d) =>{
tag.append(0b0010_01, 6);
data.extend_from_slice(&d.to_be_bytes());
},
KVal::Decimal(d) => {
let i = d.int;
let dot = d.dot;
let ans = super::var_int::encode128(i);
let size = ans.len();
if size == 0 || 17 <= size { unreachable!("decimal's size must be 1..=16"); }
tag.append(0b0100_001, 7);
tag.append((size - 1) as u64, 4);
data.extend_from_slice(&ans);
data.push(dot);
}
KVal::BigStr(s)=>{
tag.append(0b0010_001, 7);
let vec = super::var_int::encode(s.len() as i64);
tag.append((vec.len() - 1) as u64, 3);
data.extend_from_slice(&vec);
data.extend_from_slice(s.as_bytes());
},
KVal::Binary(v) =>{
tag.append(0b0001_1, 5);
let vec = super::var_int::encode(v.len() as i64);
tag.append((vec.len() - 1) as u64, 3);
data.extend_from_slice(&vec);
data.extend_from_slice(v);
},
KVal::BinaryArc(v) =>{
tag.append(0b0001_1, 5);
let vec = super::var_int::encode(v.len() as i64);
tag.append((vec.len() - 1) as u64, 3);
data.extend_from_slice(&vec);
data.extend_from_slice(v);
},
KVal::Binary8(v) =>{
tag.append(0b0001_01, 6);
let vec = super::var_int::encode(v.len() as i64);
tag.append((vec.len() - 1) as u64, 3);
data.extend_from_slice(&vec);
for i in v{
data.write_all(&i.to_le_bytes())?;
}
},
KVal::Binary4(v) =>{
tag.append(0b0001_001, 7);
let vec = super::var_int::encode(v.len() as i64);
tag.append((vec.len() - 1) as u64, 3);
data.extend_from_slice(&vec);
for i in v{
data.write_all(&i.to_le_bytes())?;
}
},
KVal::Binary2(v) =>{
tag.append(0b0001_0001, 8);
let vec = super::var_int::encode(v.len() as i64);
tag.append((vec.len() - 1) as u64, 3);
data.extend_from_slice(&vec);
for i in v{
data.write_all(&i.to_le_bytes())?;
}
},
KVal::Undefined(i)=>{
if 8 <= *i{ panic!("Undefined must be 0..=7") }
tag.append(0b0000_1, 5);
tag.append(0, *i as usize);
tag.append(1, 1);
},
}
}
let tag_vec = tag.to_vec();
super::var_int::write(vec.len() as i64, &mut writer)?;
super::var_int::write(tag_vec.len() as i64, &mut writer)?;
writer.write(&tag_vec)?;
writer.write(&data)?;
return Ok(writer.bytes_written())
}