Function parse_buffer_size 

pub fn parse_buffer_size(size_str: &str) -> Result<usize, String>

Parses a buffer size string with optional unit suffixes into a usize value.

This function accepts numeric values with optional unit suffixes (e.g., "K", "MB", "GB") and converts them into their corresponding byte values. The parsing is case-insensitive, and spaces around the input string are trimmed.

Supported Units

• No unit: Assumes bytes (e.g., "1024" → 1024 bytes)
• K or KB: Kilobytes (e.g., "2K" or "2KB" → 2048 bytes)
• M or MB: Megabytes (e.g., "1M" or "1MB" → 1048576 bytes)
• G or GB: Gigabytes (e.g., "1G" or "1GB" → 1073741824 bytes)

Arguments

• size_str - A string slice representing the buffer size with an optional unit.

Returns

Returns Ok(usize) if parsing succeeds, or an Err(String) if the format is invalid.

Examples

use simd_r_drive::utils::parse_buffer_size;

assert_eq!(parse_buffer_size("1024").unwrap(), 1024);
assert_eq!(parse_buffer_size("2K").unwrap(), 2048);
assert_eq!(parse_buffer_size("1MB").unwrap(), 1_048_576);
assert_eq!(parse_buffer_size("1G").unwrap(), 1_073_741_824);

assert!(parse_buffer_size("abc").is_err()); // Invalid input
assert!(parse_buffer_size("10XZ").is_err()); // Invalid unit