Struct KVReader 

pub struct KVReader<'a, S: NorFlash> {
    pub entry: KVEntry,
    /* private fields */
}

KV值读取器

实现了embedded-io的Read和Seek trait，用于流式读取KV值，适合处理大型数据 生命周期'a确保读取器不会超过其关联的KVDB实例的生命周期

Fields

entry: KVEntry

Implementations

impl<'a, S: NorFlash> KVReader<'a, S>

pub fn new(kvdb: &'a mut KVDB<S>, entry: KVEntry) -> Self

Trait Implementations

impl<'a, S: NorFlash> ErrorType for KVReader<'a, S>

type Error = Error

Error type of all the IO operations on this type.

impl<'a, S: NorFlash> Read for KVReader<'a, S>

fn read(&mut self, buf: &mut [u8]) -> Result<usize, Self::Error>

从KV值中读取数据到缓冲区

参数

• buf: 接收数据的缓冲区

返回值

成功时返回读取的字节数，失败时返回Error

fn read_exact( &mut self, buf: &mut [u8], ) -> Result<(), ReadExactError<Self::Error>>

Read the exact number of bytes required to fill buf.

impl<'a, S: NorFlash> Seek for KVReader<'a, S>

fn seek(&mut self, pos: SeekFrom) -> Result<u64, Self::Error>

调整读取位置

参数

• pos: 要定位的位置，支持从开始、当前位置或末尾偏移

返回值

成功时返回新的位置，失败时返回Error

fn rewind(&mut self) -> Result<(), Self::Error>

Rewind to the beginning of a stream.

fn stream_position(&mut self) -> Result<u64, Self::Error>

Returns the current seek position from the start of the stream.