68 lines
1.8 KiB
Rust
68 lines
1.8 KiB
Rust
use std::fs::{File, OpenOptions};
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use std::io::{self, Seek, SeekFrom};
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use crate::cli::CONFIG;
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use anyhow::Context;
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/// Get length of data stream.
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/// Physical length of data stream in bytes
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/// (multiple of sector_size, rather than actual).
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///
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/// This will attempt to return the stream to its current read position.
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pub fn get_stream_length<S: Seek>(stream: &mut S) -> io::Result<u64> {
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let pos = stream.stream_position()?;
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let len = stream.seek(SeekFrom::End(0));
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stream.seek(SeekFrom::Start(pos))?;
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len
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}
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pub fn load_input() -> anyhow::Result<File> {
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OpenOptions::new()
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.read(true)
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.open(&CONFIG.input)
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.with_context(|| format!("Failed to open input file: {}", &CONFIG.input.display()))
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}
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pub fn load_output() -> anyhow::Result<File> {
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OpenOptions::new()
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.read(true)
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.write(true)
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.create(true)
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.open(crate::path::OUTPUT_PATH.clone())
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.with_context(|| {
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format!(
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"Failed to open/create output file at: {}",
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crate::path::OUTPUT_PATH.display()
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)
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})
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}
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pub fn load_map_read() -> anyhow::Result<File> {
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OpenOptions::new()
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.read(true)
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.open(crate::path::MAP_PATH.clone())
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.with_context(|| {
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format!(
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"Failed to open/create mapping file at: {}",
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crate::path::MAP_PATH.display()
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)
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})
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}
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pub fn load_map_write() -> anyhow::Result<File> {
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OpenOptions::new()
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.write(true)
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.create(true)
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.truncate(true) // Wipe old map. Should really make a backup first.
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.open(crate::path::MAP_PATH.clone())
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.with_context(|| {
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format!(
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"Failed to open map file at: {}",
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crate::path::MAP_PATH.display()
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)
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})
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}
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