sqlx-core 0.2.6

Core of SQLx, the rust SQL toolkit. Not intended to be used directly.
Documentation 
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use std::ops::Range;

use byteorder::{ByteOrder, LittleEndian};

use crate::io::Buf;
use crate::mysql::io::BufExt;
use crate::mysql::protocol::{Decode, TypeId};

pub struct Row {
    buffer: Box<[u8]>,
    values: Box<[Option<Range<usize>>]>,
    binary: bool,
}

impl Row {
    pub fn len(&self) -> usize {
        self.values.len()
    }

    pub fn get(&self, index: usize) -> Option<&[u8]> {
        let range = self.values[index].as_ref()?;

        Some(&self.buffer[(range.start as usize)..(range.end as usize)])
    }
}

fn get_lenenc(buf: &[u8]) -> usize {
    match buf[0] {
        0xFB => 1,

        0xFC => {
            let len_size = 1 + 2;
            let len = LittleEndian::read_u16(&buf[1..]);

            len_size + len as usize
        }

        0xFD => {
            let len_size = 1 + 3;
            let len = LittleEndian::read_u24(&buf[1..]);

            len_size + len as usize
        }

        0xFE => {
            let len_size = 1 + 8;
            let len = LittleEndian::read_u64(&buf[1..]);

            len_size + len as usize
        }

        value => 1 + value as usize,
    }
}

impl Row {
    pub fn decode(mut buf: &[u8], columns: &[TypeId], binary: bool) -> crate::Result<Self> {
        if !binary {
            let buffer: Box<[u8]> = buf.into();
            let mut values = Vec::with_capacity(columns.len());
            let mut index = 0;

            for column_idx in 0..columns.len() {
                let size = get_lenenc(&buf[index..]);

                values.push(Some(index..(index + size)));

                index += size;
                buf.advance(size);
            }

            return Ok(Self {
                buffer,
                values: values.into_boxed_slice(),
                binary,
            });
        }

        // 0x00 header : byte<1>
        let header = buf.get_u8()?;
        if header != 0 {
            return Err(protocol_err!("expected ROW (0x00), got: {:#04X}", header).into());
        }

        // NULL-Bitmap : byte<(number_of_columns + 9) / 8>
        let null_len = (columns.len() + 9) / 8;
        let null_bitmap = &buf[..];
        buf.advance(null_len);

        let buffer: Box<[u8]> = buf.into();
        let mut values = Vec::with_capacity(columns.len());
        let mut index = 0;

        for column_idx in 0..columns.len() {
            // the null index for a column starts at the 3rd bit in the null bitmap
            // for no reason at all besides mysql probably
            let column_null_idx = column_idx + 2;
            let is_null =
                null_bitmap[column_null_idx / 8] & (1 << (column_null_idx % 8) as u8) != 0;

            if is_null {
                values.push(None);
            } else {
                let size = match columns[column_idx] {
                    TypeId::TINY_INT => 1,
                    TypeId::SMALL_INT => 2,
                    TypeId::INT | TypeId::FLOAT => 4,
                    TypeId::BIG_INT | TypeId::DOUBLE => 8,

                    TypeId::DATE => 5,
                    TypeId::TIME => 1 + buffer[index] as usize,

                    TypeId::TIMESTAMP | TypeId::DATETIME => 1 + buffer[index] as usize,

                    TypeId::TINY_BLOB
                    | TypeId::MEDIUM_BLOB
                    | TypeId::LONG_BLOB
                    | TypeId::CHAR
                    | TypeId::TEXT
                    | TypeId::VAR_CHAR => get_lenenc(&buffer[index..]),

                    id => {
                        unimplemented!("encountered unknown field type id: {:?}", id);
                    }
                };

                values.push(Some(index..(index + size)));
                index += size;
            }
        }

        Ok(Self {
            buffer,
            values: values.into_boxed_slice(),
            binary,
        })
    }
}

#[cfg(test)]
mod test {
    use super::super::column_count::ColumnCount;
    use super::super::column_def::ColumnDefinition;
    use super::super::eof::EofPacket;
    use super::*;

    #[test]
    fn null_bitmap_test() -> crate::Result<()> {
        let column_len = ColumnCount::decode(&[26])?;
        assert_eq!(column_len.columns, 26);

        let types: Vec<TypeId> = vec![
            ColumnDefinition::decode(&[
                3, 100, 101, 102, 4, 115, 113, 108, 120, 8, 97, 99, 99, 111, 117, 110, 116, 115, 8,
                97, 99, 99, 111, 117, 110, 116, 115, 2, 105, 100, 2, 105, 100, 12, 63, 0, 11, 0, 0,
                0, 3, 11, 66, 0, 0, 0,
            ])?,
            ColumnDefinition::decode(&[
                3, 100, 101, 102, 4, 115, 113, 108, 120, 8, 97, 99, 99, 111, 117, 110, 116, 115, 8,
                97, 99, 99, 111, 117, 110, 116, 115, 6, 102, 105, 101, 108, 100, 50, 6, 102, 105,
                101, 108, 100, 50, 12, 224, 0, 120, 0, 0, 0, 253, 5, 64, 0, 0, 0,
            ])?,
            ColumnDefinition::decode(&[
                3, 100, 101, 102, 4, 115, 113, 108, 120, 8, 97, 99, 99, 111, 117, 110, 116, 115, 8,
                97, 99, 99, 111, 117, 110, 116, 115, 6, 102, 105, 101, 108, 100, 51, 6, 102, 105,
                101, 108, 100, 51, 12, 224, 0, 252, 3, 0, 0, 253, 1, 0, 0, 0, 0,
            ])?,
            ColumnDefinition::decode(&[
                3, 100, 101, 102, 4, 115, 113, 108, 120, 8, 97, 99, 99, 111, 117, 110, 116, 115, 8,
                97, 99, 99, 111, 117, 110, 116, 115, 6, 102, 105, 101, 108, 100, 52, 6, 102, 105,
                101, 108, 100, 52, 12, 63, 0, 4, 0, 0, 0, 1, 1, 0, 0, 0, 0,
            ])?,
            ColumnDefinition::decode(&[
                3, 100, 101, 102, 4, 115, 113, 108, 120, 8, 97, 99, 99, 111, 117, 110, 116, 115, 8,
                97, 99, 99, 111, 117, 110, 116, 115, 6, 102, 105, 101, 108, 100, 53, 6, 102, 105,
                101, 108, 100, 53, 12, 63, 0, 19, 0, 0, 0, 7, 128, 0, 0, 0, 0,
            ])?,
            ColumnDefinition::decode(&[
                3, 100, 101, 102, 4, 115, 113, 108, 120, 8, 97, 99, 99, 111, 117, 110, 116, 115, 8,
                97, 99, 99, 111, 117, 110, 116, 115, 6, 102, 105, 101, 108, 100, 54, 6, 102, 105,
                101, 108, 100, 54, 12, 63, 0, 19, 0, 0, 0, 7, 128, 4, 0, 0, 0,
            ])?,
            ColumnDefinition::decode(&[
                3, 100, 101, 102, 4, 115, 113, 108, 120, 8, 97, 99, 99, 111, 117, 110, 116, 115, 8,
                97, 99, 99, 111, 117, 110, 116, 115, 6, 102, 105, 101, 108, 100, 55, 6, 102, 105,
                101, 108, 100, 55, 12, 63, 0, 4, 0, 0, 0, 1, 1, 64, 0, 0, 0,
            ])?,
            ColumnDefinition::decode(&[
                3, 100, 101, 102, 4, 115, 113, 108, 120, 8, 97, 99, 99, 111, 117, 110, 116, 115, 8,
                97, 99, 99, 111, 117, 110, 116, 115, 6, 102, 105, 101, 108, 100, 56, 6, 102, 105,
                101, 108, 100, 56, 12, 224, 0, 252, 255, 3, 0, 252, 16, 0, 0, 0, 0,
            ])?,
            ColumnDefinition::decode(&[
                3, 100, 101, 102, 4, 115, 113, 108, 120, 8, 97, 99, 99, 111, 117, 110, 116, 115, 8,
                97, 99, 99, 111, 117, 110, 116, 115, 6, 102, 105, 101, 108, 100, 57, 6, 102, 105,
                101, 108, 100, 57, 12, 63, 0, 4, 0, 0, 0, 1, 1, 0, 0, 0, 0,
            ])?,
            ColumnDefinition::decode(&[
                3, 100, 101, 102, 4, 115, 113, 108, 120, 8, 97, 99, 99, 111, 117, 110, 116, 115, 8,
                97, 99, 99, 111, 117, 110, 116, 115, 7, 102, 105, 101, 108, 100, 49, 48, 7, 102,
                105, 101, 108, 100, 49, 48, 12, 224, 0, 252, 3, 0, 0, 252, 16, 0, 0, 0, 0,
            ])?,
            ColumnDefinition::decode(&[
                3, 100, 101, 102, 4, 115, 113, 108, 120, 8, 97, 99, 99, 111, 117, 110, 116, 115, 8,
                97, 99, 99, 111, 117, 110, 116, 115, 7, 102, 105, 101, 108, 100, 49, 49, 7, 102,
                105, 101, 108, 100, 49, 49, 12, 224, 0, 252, 3, 0, 0, 252, 16, 0, 0, 0, 0,
            ])?,
            ColumnDefinition::decode(&[
                3, 100, 101, 102, 4, 115, 113, 108, 120, 8, 97, 99, 99, 111, 117, 110, 116, 115, 8,
                97, 99, 99, 111, 117, 110, 116, 115, 7, 102, 105, 101, 108, 100, 49, 50, 7, 102,
                105, 101, 108, 100, 49, 50, 12, 63, 0, 19, 0, 0, 0, 7, 129, 0, 0, 0, 0,
            ])?,
            ColumnDefinition::decode(&[
                3, 100, 101, 102, 4, 115, 113, 108, 120, 8, 97, 99, 99, 111, 117, 110, 116, 115, 8,
                97, 99, 99, 111, 117, 110, 116, 115, 7, 102, 105, 101, 108, 100, 49, 51, 7, 102,
                105, 101, 108, 100, 49, 51, 12, 63, 0, 4, 0, 0, 0, 1, 0, 64, 0, 0, 0,
            ])?,
            ColumnDefinition::decode(&[
                3, 100, 101, 102, 4, 115, 113, 108, 120, 8, 97, 99, 99, 111, 117, 110, 116, 115, 8,
                97, 99, 99, 111, 117, 110, 116, 115, 7, 102, 105, 101, 108, 100, 49, 52, 7, 102,
                105, 101, 108, 100, 49, 52, 12, 63, 0, 11, 0, 0, 0, 3, 0, 0, 0, 0, 0,
            ])?,
            ColumnDefinition::decode(&[
                3, 100, 101, 102, 4, 115, 113, 108, 120, 8, 97, 99, 99, 111, 117, 110, 116, 115, 8,
                97, 99, 99, 111, 117, 110, 116, 115, 7, 102, 105, 101, 108, 100, 49, 53, 7, 102,
                105, 101, 108, 100, 49, 53, 12, 63, 0, 11, 0, 0, 0, 3, 0, 0, 0, 0, 0,
            ])?,
            ColumnDefinition::decode(&[
                3, 100, 101, 102, 4, 115, 113, 108, 120, 8, 97, 99, 99, 111, 117, 110, 116, 115, 8,
                97, 99, 99, 111, 117, 110, 116, 115, 7, 102, 105, 101, 108, 100, 49, 54, 7, 102,
                105, 101, 108, 100, 49, 54, 12, 63, 0, 4, 0, 0, 0, 1, 1, 0, 0, 0, 0,
            ])?,
            ColumnDefinition::decode(&[
                3, 100, 101, 102, 4, 115, 113, 108, 120, 8, 97, 99, 99, 111, 117, 110, 116, 115, 8,
                97, 99, 99, 111, 117, 110, 116, 115, 7, 102, 105, 101, 108, 100, 49, 55, 7, 102,
                105, 101, 108, 100, 49, 55, 12, 224, 0, 0, 1, 0, 0, 253, 0, 0, 0, 0, 0,
            ])?,
            ColumnDefinition::decode(&[
                3, 100, 101, 102, 4, 115, 113, 108, 120, 8, 97, 99, 99, 111, 117, 110, 116, 115, 8,
                97, 99, 99, 111, 117, 110, 116, 115, 7, 102, 105, 101, 108, 100, 49, 56, 7, 102,
                105, 101, 108, 100, 49, 56, 12, 63, 0, 11, 0, 0, 0, 3, 1, 0, 0, 0, 0,
            ])?,
            ColumnDefinition::decode(&[
                3, 100, 101, 102, 4, 115, 113, 108, 120, 8, 97, 99, 99, 111, 117, 110, 116, 115, 8,
                97, 99, 99, 111, 117, 110, 116, 115, 7, 102, 105, 101, 108, 100, 49, 57, 7, 102,
                105, 101, 108, 100, 49, 57, 12, 63, 0, 11, 0, 0, 0, 3, 1, 0, 0, 0, 0,
            ])?,
            ColumnDefinition::decode(&[
                3, 100, 101, 102, 4, 115, 113, 108, 120, 8, 97, 99, 99, 111, 117, 110, 116, 115, 8,
                97, 99, 99, 111, 117, 110, 116, 115, 7, 102, 105, 101, 108, 100, 50, 48, 7, 102,
                105, 101, 108, 100, 50, 48, 12, 63, 0, 19, 0, 0, 0, 7, 128, 0, 0, 0, 0,
            ])?,
            ColumnDefinition::decode(&[
                3, 100, 101, 102, 4, 115, 113, 108, 120, 8, 97, 99, 99, 111, 117, 110, 116, 115, 8,
                97, 99, 99, 111, 117, 110, 116, 115, 7, 102, 105, 101, 108, 100, 50, 49, 7, 102,
                105, 101, 108, 100, 50, 49, 12, 63, 0, 19, 0, 0, 0, 7, 128, 0, 0, 0, 0,
            ])?,
            ColumnDefinition::decode(&[
                3, 100, 101, 102, 4, 115, 113, 108, 120, 8, 97, 99, 99, 111, 117, 110, 116, 115, 8,
                97, 99, 99, 111, 117, 110, 116, 115, 7, 102, 105, 101, 108, 100, 50, 50, 7, 102,
                105, 101, 108, 100, 50, 50, 12, 63, 0, 3, 0, 0, 0, 3, 0, 0, 0, 0, 0,
            ])?,
            ColumnDefinition::decode(&[
                3, 100, 101, 102, 4, 115, 113, 108, 120, 8, 97, 99, 99, 111, 117, 110, 116, 115, 8,
                97, 99, 99, 111, 117, 110, 116, 115, 7, 102, 105, 101, 108, 100, 50, 51, 7, 102,
                105, 101, 108, 100, 50, 51, 12, 63, 0, 6, 0, 0, 0, 3, 1, 0, 0, 0, 0,
            ])?,
            ColumnDefinition::decode(&[
                3, 100, 101, 102, 4, 115, 113, 108, 120, 8, 97, 99, 99, 111, 117, 110, 116, 115, 8,
                97, 99, 99, 111, 117, 110, 116, 115, 7, 102, 105, 101, 108, 100, 50, 52, 7, 102,
                105, 101, 108, 100, 50, 52, 12, 63, 0, 6, 0, 0, 0, 3, 1, 0, 0, 0, 0,
            ])?,
            ColumnDefinition::decode(&[
                3, 100, 101, 102, 4, 115, 113, 108, 120, 8, 97, 99, 99, 111, 117, 110, 116, 115, 8,
                97, 99, 99, 111, 117, 110, 116, 115, 7, 102, 105, 101, 108, 100, 50, 53, 7, 102,
                105, 101, 108, 100, 50, 53, 12, 63, 0, 20, 0, 0, 0, 8, 1, 0, 0, 0, 0,
            ])?,
            ColumnDefinition::decode(&[
                3, 100, 101, 102, 4, 115, 113, 108, 120, 8, 97, 99, 99, 111, 117, 110, 116, 115, 8,
                97, 99, 99, 111, 117, 110, 116, 115, 7, 102, 105, 101, 108, 100, 50, 54, 7, 102,
                105, 101, 108, 100, 50, 54, 12, 63, 0, 11, 0, 0, 0, 3, 0, 0, 0, 0, 0,
            ])?,
        ]
        .into_iter()
        .map(|def| def.type_id)
        .collect();

        EofPacket::decode(&[254, 0, 0, 34, 0])?;

        Row::decode(
            &[
                0, 64, 90, 229, 0, 4, 0, 0, 0, 4, 114, 117, 115, 116, 0, 0, 7, 228, 7, 1, 16, 8,
                10, 17, 0, 0, 4, 208, 7, 1, 1, 0, 0, 0, 0, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
                0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            ],
            &types,
            true,
        )?;

        EofPacket::decode(&[254, 0, 0, 34, 0])?;
        Ok(())
    }
}