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use std::io::{Read, Seek};
use std::{collections::VecDeque, convert::TryInto};
use crate::datatypes::DataType;
use crate::error::{Error, Result};
use crate::{array::PrimitiveArray, types::NativeType};
use super::super::read_basic::*;
use super::super::{Compression, IpcBuffer, Node, OutOfSpecKind};
#[allow(clippy::too_many_arguments)]
pub fn read_primitive<T: NativeType, R: Read + Seek>(
field_nodes: &mut VecDeque<Node>,
data_type: DataType,
buffers: &mut VecDeque<IpcBuffer>,
reader: &mut R,
block_offset: u64,
is_little_endian: bool,
compression: Option<Compression>,
limit: Option<usize>,
scratch: &mut Vec<u8>,
) -> Result<PrimitiveArray<T>>
where
Vec<u8>: TryInto<T::Bytes>,
{
let field_node = field_nodes.pop_front().ok_or_else(|| {
Error::oos(format!(
"IPC: unable to fetch the field for {:?}. The file or stream is corrupted.",
data_type
))
})?;
let validity = read_validity(
buffers,
field_node,
reader,
block_offset,
is_little_endian,
compression,
limit,
scratch,
)?;
let length: usize = field_node
.length()
.try_into()
.map_err(|_| Error::from(OutOfSpecKind::NegativeFooterLength))?;
let length = limit.map(|limit| limit.min(length)).unwrap_or(length);
let values = read_buffer(
buffers,
length,
reader,
block_offset,
is_little_endian,
compression,
scratch,
)?;
PrimitiveArray::<T>::try_new(data_type, values, validity)
}
pub fn skip_primitive(
field_nodes: &mut VecDeque<Node>,
buffers: &mut VecDeque<IpcBuffer>,
) -> Result<()> {
let _ = field_nodes.pop_front().ok_or_else(|| {
Error::oos("IPC: unable to fetch the field for primitive. The file or stream is corrupted.")
})?;
let _ = buffers
.pop_front()
.ok_or_else(|| Error::oos("IPC: missing validity buffer."))?;
let _ = buffers
.pop_front()
.ok_or_else(|| Error::oos("IPC: missing values buffer."))?;
Ok(())
}