forked from vieter-v/vieter
60 lines
1.3 KiB
V
60 lines
1.3 KiB
V
module util
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import os
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import crypto.sha256
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const (
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reader_buf_size = 1_000_000
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prefixes = ['B', 'KB', 'MB', 'GB']
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)
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// Dummy struct to work around the fact that you can only share structs, maps &
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// arrays
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pub struct Dummy {
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x int
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}
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// exit_with_message exits the program with a given status code after having
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// first printed a specific message to STDERR
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[noreturn]
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pub fn exit_with_message(code int, msg string) {
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eprintln(msg)
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exit(code)
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}
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// hash_file returns the sha256 hash of a given file
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pub fn hash_file(path &string) ?string {
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file := os.open(path) or { return error('Failed to open file.') }
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mut sha256sum := sha256.new()
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buf_size := int(1_000_000)
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mut buf := []u8{len: buf_size}
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mut bytes_left := os.file_size(path)
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for bytes_left > 0 {
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// TODO check if just breaking here is safe
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bytes_read := file.read(mut buf) or { return error('Failed to read from file.') }
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bytes_left -= u64(bytes_read)
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// This function never actually fails, but returns an option to follow
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// the Writer interface.
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sha256sum.write(buf[..bytes_read])?
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}
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return sha256sum.checksum().hex()
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}
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// pretty_bytes converts a byte count to human-readable version
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pub fn pretty_bytes(bytes int) string {
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mut i := 0
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mut n := f32(bytes)
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for n >= 1024 {
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i++
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n /= 1024
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}
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return '${n:.2}${util.prefixes[i]}'
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}
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