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struct_.rs
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struct_.rs
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use std::collections::VecDeque;
use std::io::{Read, Seek};
use crate::array::StructArray;
use crate::datatypes::DataType;
use crate::error::{Error, Result};
use super::super::super::IpcField;
use super::super::deserialize::{read, skip};
use super::super::read_basic::*;
use super::super::{Compression, Dictionaries, IpcBuffer, Node, Version};
#[allow(clippy::too_many_arguments)]
pub fn read_struct<R: Read + Seek>(
field_nodes: &mut VecDeque<Node>,
data_type: DataType,
ipc_field: &IpcField,
buffers: &mut VecDeque<IpcBuffer>,
reader: &mut R,
dictionaries: &Dictionaries,
block_offset: u64,
is_little_endian: bool,
compression: Option<Compression>,
version: Version,
scratch: &mut Vec<u8>,
) -> Result<StructArray> {
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,
scratch,
)?;
let fields = StructArray::get_fields(&data_type);
let values = fields
.iter()
.zip(ipc_field.fields.iter())
.map(|(field, ipc_field)| {
read(
field_nodes,
field,
ipc_field,
buffers,
reader,
dictionaries,
block_offset,
is_little_endian,
compression,
version,
scratch,
)
})
.collect::<Result<Vec<_>>>()?;
StructArray::try_new(data_type, values, validity)
}
pub fn skip_struct(
field_nodes: &mut VecDeque<Node>,
data_type: &DataType,
buffers: &mut VecDeque<IpcBuffer>,
) -> Result<()> {
let _ = field_nodes.pop_front().ok_or_else(|| {
Error::oos("IPC: unable to fetch the field for struct. The file or stream is corrupted.")
})?;
let _ = buffers
.pop_front()
.ok_or_else(|| Error::oos("IPC: missing validity buffer."))?;
let fields = StructArray::get_fields(data_type);
fields
.iter()
.try_for_each(|field| skip(field_nodes, field.data_type(), buffers))
}