41 lines
1.2 KiB
Rust
41 lines
1.2 KiB
Rust
use std::io::{Cursor, Read};
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pub trait CursorExt {
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fn read_u8(&mut self) -> anyhow::Result<u8>;
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fn read_u16(&mut self) -> anyhow::Result<u16>;
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fn read_u32(&mut self) -> anyhow::Result<u32>;
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fn read_bytes(&mut self, len: usize) -> anyhow::Result<Vec<u8>>;
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fn read_string(&mut self, len: usize) -> anyhow::Result<String>;
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}
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impl CursorExt for Cursor<&[u8]> {
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fn read_u8(&mut self) -> anyhow::Result<u8> {
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let mut result = [0u8; 1];
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self.read_exact(&mut result)?;
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Ok(result[0])
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}
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fn read_u16(&mut self) -> anyhow::Result<u16> {
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let mut result = [0u8; 2];
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self.read_exact(&mut result)?;
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Ok(u16::from_be_bytes(result))
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}
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fn read_u32(&mut self) -> anyhow::Result<u32> {
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let mut result = [0u8; 4];
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self.read_exact(&mut result)?;
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Ok(u32::from_be_bytes(result))
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}
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fn read_bytes(&mut self, len: usize) -> anyhow::Result<Vec<u8>> {
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let mut result = vec![0u8; len];
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self.read_exact(&mut result)?;
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Ok(result)
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}
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fn read_string(&mut self, len: usize) -> anyhow::Result<String> {
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let result = self.read_bytes(len)?;
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Ok(String::from_utf8_lossy(&result).to_string())
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}
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}
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