Function parse_size 

pub fn parse_size(size_str: &str) -> Result<u64>

Parse a human-readable size string into bytes.

Supports both decimal (KB, MB, GB) and binary (KiB, MiB, GiB) units, as well as decimal numbers (e.g., “1.5GB”).

Arguments

• size_str - A string representing the size (e.g., “100MB”, “1.5GiB”, “1,000,000”)

Returns

• Ok(u64) - The size in bytes
• Err(anyhow::Error) - If the string format is invalid or causes overflow

Errors

This function will return an error if:

• The size string format is invalid (e.g., “1.2.3MB”, “invalid”)
• The number cannot be parsed as a valid integer or decimal
• The resulting value would overflow u64
• The decimal has too many fractional digits (more than 9)

Examples

assert_eq!(parse_size("100KB")?, 100_000);
assert_eq!(parse_size("1.5MB")?, 1_500_000);
assert_eq!(parse_size("1GiB")?, 1_073_741_824);

Supported Units

• Decimal: KB (1000), MB (1000²), GB (1000³)
• Binary: KiB (1024), MiB (1024²), GiB (1024³)
• Bytes: Plain numbers without units