litchi 0.0.1

High-performance parser for Microsoft Office, OpenDocument, and Apple iWork file formats with unified API
Documentation 
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//! Utility functions and constants for file format detection.

use std::io::Read;

// Magic number signatures
pub const OLE2_SIGNATURE: &[u8] = &[0xD0, 0xCF, 0x11, 0xE0, 0xA1, 0xB1, 0x1A, 0xE1];
pub const ZIP_SIGNATURE: &[u8] = &[0x50, 0x4B, 0x03, 0x04];

/// Helper function to find a pattern in a buffer efficiently.
/// Only scans the necessary portion without full buffer traversal.
pub fn find_in_buffer(buffer: &[u8], pattern: &[u8]) -> bool {
    buffer.windows(pattern.len()).any(|window| window == pattern)
}

/// Read a file from ZIP archive with minimal memory allocation.
pub fn read_zip_file<R: Read + std::io::Seek>(
    archive: &mut zip::ZipArchive<R>,
    file_name: &str
) -> std::io::Result<Vec<u8>> {
    let mut file = archive.by_name(file_name)?;
    let mut buffer = Vec::new();
    file.read_to_end(&mut buffer)?;
    Ok(buffer)
}