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* Hook up Avro Decoder * Docs * Improved varint decode * Docs * Clippy * More clippy
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,121 @@ | ||
| // Licensed to the Apache Software Foundation (ASF) under one | ||
| // or more contributor license agreements. See the NOTICE file | ||
| // distributed with this work for additional information | ||
| // regarding copyright ownership. The ASF licenses this file | ||
| // to you under the Apache License, Version 2.0 (the | ||
| // "License"); you may not use this file except in compliance | ||
| // with the License. You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, | ||
| // software distributed under the License is distributed on an | ||
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| // KIND, either express or implied. See the License for the | ||
| // specific language governing permissions and limitations | ||
| // under the License. | ||
|
|
||
| use crate::reader::vlq::read_varint; | ||
| use arrow_schema::ArrowError; | ||
|
|
||
| /// A wrapper around a byte slice, providing low-level decoding for Avro | ||
| /// | ||
| /// <https://avro.apache.org/docs/1.11.1/specification/#encodings> | ||
| #[derive(Debug)] | ||
| pub(crate) struct AvroCursor<'a> { | ||
| buf: &'a [u8], | ||
| start_len: usize, | ||
| } | ||
|
|
||
| impl<'a> AvroCursor<'a> { | ||
| pub(crate) fn new(buf: &'a [u8]) -> Self { | ||
| Self { | ||
| buf, | ||
| start_len: buf.len(), | ||
| } | ||
| } | ||
|
|
||
| /// Returns the current cursor position | ||
| #[inline] | ||
| pub(crate) fn position(&self) -> usize { | ||
| self.start_len - self.buf.len() | ||
| } | ||
|
|
||
| /// Read a single `u8` | ||
| #[inline] | ||
| pub(crate) fn get_u8(&mut self) -> Result<u8, ArrowError> { | ||
| match self.buf.first().copied() { | ||
| Some(x) => { | ||
| self.buf = &self.buf[1..]; | ||
| Ok(x) | ||
| } | ||
| None => Err(ArrowError::ParseError("Unexpected EOF".to_string())), | ||
| } | ||
| } | ||
|
|
||
| #[inline] | ||
| pub(crate) fn get_bool(&mut self) -> Result<bool, ArrowError> { | ||
| Ok(self.get_u8()? != 0) | ||
| } | ||
|
|
||
| pub(crate) fn read_vlq(&mut self) -> Result<u64, ArrowError> { | ||
| let (val, offset) = read_varint(self.buf) | ||
| .ok_or_else(|| ArrowError::ParseError("bad varint".to_string()))?; | ||
| self.buf = &self.buf[offset..]; | ||
| Ok(val) | ||
| } | ||
|
|
||
| #[inline] | ||
| pub(crate) fn get_int(&mut self) -> Result<i32, ArrowError> { | ||
| let varint = self.read_vlq()?; | ||
| let val: u32 = varint | ||
| .try_into() | ||
| .map_err(|_| ArrowError::ParseError("varint overflow".to_string()))?; | ||
| Ok((val >> 1) as i32 ^ -((val & 1) as i32)) | ||
| } | ||
|
|
||
| #[inline] | ||
| pub(crate) fn get_long(&mut self) -> Result<i64, ArrowError> { | ||
| let val = self.read_vlq()?; | ||
| Ok((val >> 1) as i64 ^ -((val & 1) as i64)) | ||
| } | ||
|
|
||
| pub(crate) fn get_bytes(&mut self) -> Result<&'a [u8], ArrowError> { | ||
| let len: usize = self.get_long()?.try_into().map_err(|_| { | ||
| ArrowError::ParseError("offset overflow reading avro bytes".to_string()) | ||
| })?; | ||
|
|
||
| if (self.buf.len() < len) { | ||
| return Err(ArrowError::ParseError( | ||
| "Unexpected EOF reading bytes".to_string(), | ||
| )); | ||
| } | ||
| let ret = &self.buf[..len]; | ||
| self.buf = &self.buf[len..]; | ||
| Ok(ret) | ||
| } | ||
|
|
||
| #[inline] | ||
| pub(crate) fn get_float(&mut self) -> Result<f32, ArrowError> { | ||
| if (self.buf.len() < 4) { | ||
| return Err(ArrowError::ParseError( | ||
| "Unexpected EOF reading float".to_string(), | ||
| )); | ||
| } | ||
| let ret = f32::from_le_bytes(self.buf[..4].try_into().unwrap()); | ||
| self.buf = &self.buf[4..]; | ||
| Ok(ret) | ||
| } | ||
|
|
||
| #[inline] | ||
| pub(crate) fn get_double(&mut self) -> Result<f64, ArrowError> { | ||
| if (self.buf.len() < 8) { | ||
| return Err(ArrowError::ParseError( | ||
| "Unexpected EOF reading float".to_string(), | ||
| )); | ||
| } | ||
| let ret = f64::from_le_bytes(self.buf[..8].try_into().unwrap()); | ||
| self.buf = &self.buf[8..]; | ||
| Ok(ret) | ||
| } | ||
| } |
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