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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| use arrow_schema::ArrowError; | ||
|
|
||
| #[derive(Debug)] | ||
| pub(crate) struct BufCursor<'a> { | ||
| buf: &'a [u8], | ||
| start_len: usize, | ||
| } | ||
|
|
||
| impl<'a> BufCursor<'a> { | ||
| pub(crate) fn new(buf: &'a [u8]) -> Self { | ||
| Self { | ||
| buf, | ||
| start_len: buf.len(), | ||
| } | ||
| } | ||
|
|
||
| #[inline] | ||
| pub(crate) fn offset(&self) -> usize { | ||
| self.start_len - self.buf.len() | ||
| } | ||
|
|
||
| #[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) | ||
| } | ||
|
|
||
| #[inline] | ||
| pub(crate) fn get_int(&mut self) -> Result<i32, ArrowError> { | ||
| let mut in_progress = 0; | ||
| let mut shift = 0; | ||
|
|
||
| while let Some(byte) = self.buf.first().copied() { | ||
| self.buf = &self.buf[1..]; | ||
| in_progress |= ((byte & 0x7F) as u32) << shift; | ||
| shift += 7; | ||
| if byte & 0x80 == 0 { | ||
| let val = in_progress; | ||
| in_progress = 0; | ||
| shift = 0; | ||
| return Ok((val >> 1) as i32 ^ -((val & 1) as i32)); | ||
| } | ||
| } | ||
| Err(ArrowError::ParseError( | ||
| "Unexpected EOF reading int".to_string(), | ||
| )) | ||
| } | ||
|
|
||
| #[inline] | ||
| pub(crate) fn get_long(&mut self) -> Result<i64, ArrowError> { | ||
| let mut in_progress = 0; | ||
| let mut shift = 0; | ||
|
|
||
| while let Some(byte) = self.buf.first().copied() { | ||
| self.buf = &self.buf[1..]; | ||
| in_progress |= ((byte & 0x7F) as u64) << shift; | ||
| shift += 7; | ||
| if byte & 0x80 == 0 { | ||
| let val = in_progress; | ||
| in_progress = 0; | ||
| shift = 0; | ||
| return Ok((val >> 1) as i64 ^ -((val & 1) as i64)); | ||
| } | ||
| } | ||
| Err(ArrowError::ParseError( | ||
| "Unexpected EOF reading long".to_string(), | ||
| )) | ||
| } | ||
|
|
||
| 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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