61 lines
1.5 KiB
Rust
61 lines
1.5 KiB
Rust
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use std::io::prelude::*;
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use std::io;
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use std::fs::File;
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use num::*;
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use clap::Parser;
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#[derive(Parser)]
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struct Cli {
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/// The path to the file to read
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#[clap(parse(from_os_str))]
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path: std::path::PathBuf,
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}
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struct Timestamp{
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file_offset: u64,
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timestamp: BigInt
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}
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fn main() -> std::io::Result<()> {
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let args = Cli::parse();
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let file = File::open(&args.path)?;
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let mut reader = io::BufReader::new(file);
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let mut buffer = String::new();
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let mut timestamp_offsets = Vec::new();
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let mut timestamps = Vec::new();
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while {
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let bytes_read = reader.read_line(&mut buffer).unwrap();
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bytes_read > 0
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} {
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if &buffer[0..1] == "#" {
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let pos = reader.stream_position().unwrap();
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timestamp_offsets.push(pos);
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let timestamp = {
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let len = buffer.len();
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let str_val = &buffer[1..(len - 1)].as_bytes();
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BigInt::parse_bytes(str_val, 10).unwrap()
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};
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timestamps.push(timestamp);
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}
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buffer.clear()
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}
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let index = 4;
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let timestamp_offset = timestamp_offsets.get(index).unwrap();
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let timestamp = timestamps.get(index).unwrap();
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dbg!((timestamp_offset, timestamp));
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// seek to where we found the first timestamp and read
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// out the next line
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reader.seek(io::SeekFrom::Start(*timestamp_offset));
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reader.read_line(&mut buffer);
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dbg!(buffer);
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Ok(())
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}
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