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use crate::kval_enum::{KVal};
use super::tag_reader::TagReader;
use crate::enc_dec::kihon_from_tag::KihonFromTag;
use std::io::Read;
use crate::enc_dec::reader::Reader;
use with_capacity_safe::vec_with_capacity_safe;
use crate::error::ComResult;
pub fn decode<R : Read>(read : &mut R) -> ComResult<(Vec<KVal>, usize)>{
let mut reader = Reader::new(read);
let (count, _) = super::var_int::read(&mut reader)?;
let count = count as usize;
let (tag_len, _) = super::var_int::read(&mut reader)?;
let tag_len = tag_len as usize;
let mut tr = TagReader::new(reader.read(tag_len)?);
let mut tags : Vec<KihonFromTag> = vec_with_capacity_safe(count)?;
for _ in 0..count{
tags.push(tr.read_tag()?);
}
let mut result : Vec<KVal> = vec_with_capacity_safe(count)?;
for tag in tags{
let kihon = match tag{
KihonFromTag::Null => KVal::Null,
KihonFromTag::Bit(b) => KVal::Bit(b),
KihonFromTag::Bool(b) => KVal::Bool(b),
KihonFromTag::Byte => KVal::Byte(reader.read_byte()? as i8),
KihonFromTag::Str16(l) =>{
KVal::Str16(reader.read_string(l as usize )?)
},
KihonFromTag::Int(size) => {
let size = size as usize;
let bytes = reader.read(size)?;
KVal::Int(super::var_int::decode(bytes))
},
KihonFromTag::Float =>{
let v = reader.read(4)?;
let f : f32 = f32::from_be_bytes([v[0],v[1],v[2],v[3]]);
KVal::Float(f)
},
KihonFromTag::Str256 =>{
let size = reader.read_byte()? as usize;
KVal::Str256(reader.read_string(size)?)
},
KihonFromTag::Double =>{
let v = reader.read(8)?;
let d : f64 = f64::from_be_bytes([v[0],v[1],v[2],v[3],v[4],v[5],v[6],v[7]]);
KVal::Double(d)
},
KihonFromTag::Decimal(size) =>{
let size = size as usize;
let vec = reader.read(size)?;
let v = super::var_int::decode128(vec);
let dot = reader.read_byte()?;
KVal::Decimal(crate::kval_enum::Decimal::new(v, dot))
},
KihonFromTag::BigStr(size) =>{
let v = reader.read(size as usize)?;
let len = super::var_int::decode(v);
let s = reader.read_string(len as usize)?;
KVal::BigStr(s)
},
KihonFromTag::Binary(size) =>{
let v = reader.read(size as usize)?;
let len = super::var_int::decode(v) as usize;
let v = reader.read_binary(len)?;
KVal::Binary(v)
},
KihonFromTag::Binary8(size) =>{
let v = reader.read(size as usize)?;
let len = super::var_int::decode(v) as usize;
let v = reader.read_binary8(len)?;
KVal::Binary8(v)
},
KihonFromTag::Binary4(size) =>{
let v = reader.read(size as usize)?;
let len = super::var_int::decode(v) as usize;
let v = reader.read_binary4(len)?;
KVal::Binary4(v)
},
KihonFromTag::Binary2(size) =>{
let v = reader.read(size as usize)?;
let len = super::var_int::decode(v) as usize;
let v = reader.read_binary2(len)?;
KVal::Binary2(v)
},
KihonFromTag::Undefined(i) => KVal::Undefined(i),
};
result.push(kihon);
}
return Ok((result, reader.bytes_read()));
}