### Create ZipArchive with Memory Mapping (Rust)

Source: https://context7.com/mrkline/piz-rs/llms.txt

This example shows how to create a ZipArchive using memory mapping, which is efficient for large ZIP files as it avoids loading the entire archive into RAM. It opens a file, memory-maps it, and then parses the archive from the mapped region.

```rust
use std::fs::File;
use std::io;
use memmap2::Mmap;
use piz::ZipArchive;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Open the ZIP file
    let zip_file = File::open("large-archive.zip")?;

    // Create a memory-mapped view of the file
    let mapping = unsafe { Mmap::map(&zip_file)? };

    // Parse the archive from the memory map
    let archive = ZipArchive::new(&mapping)?;

    println!("Successfully loaded archive with {} entries", archive.entries().len());

    Ok(())
}
```

--------------------------------

### Rust: Reading and Extracting Zip Archive Entries in Parallel

Source: https://github.com/mrkline/piz-rs/blob/master/README.md

Demonstrates how to open a Zip archive, memory-map it for larger files, organize entries into a tree, and then extract all files concurrently using Rayon. It handles creating parent directories and copying file contents. Dependencies include `std::fs`, `std::io`, `memmap`, and `rayon`.

```rust
use std::fs::File;
use std::io;
use memmap::Mmap;
use rayon::prelude::*;

// Assume ZipArchive, Tree, and Entry are defined elsewhere
// use piz::{ZipArchive, Tree, Entry};

fn main() -> io::Result<()> {
    // For smaller files, 
    // let bytes = fs::read("foo.zip")
    // let archive = ZipArchive::new(&bytes)?;

    // Memory map larger files!
    let zip_file = File::open("foo.zip")?;
    let mapping = unsafe { Mmap::map(&zip_file)? };
    let archive = ZipArchive::new(&mapping)?;

    // Organize entries into a tree.
    let tree = as_tree(archive.entries())?;

    // Get metadata and read a specific file (example)
    let metadata = tree.lookup("some/specific/file")?;
    let mut reader = archive.read(metadata)?;
    let mut save_to = File::create(&*metadata.path)?;
    io::copy(&mut reader, &mut save_to)?;

    // Read out the whole archive with all cores using Rayon:
    tree.files()
        .par_bridge()
        .try_for_each(|entry| {
            if let Some(parent) = entry.path.parent() {
                // Create parent directories as needed.
                std::fs::create_dir_all(parent)?;
            }
            let mut reader = archive.read(entry)?;
            let mut save_to = File::create(&*entry.path)?;
            io::copy(&mut reader, &mut save_to)?;
            Ok(())
        })?;

    Ok(())
}

// Dummy implementations for demonstration purposes
struct ZipArchive<'a> { data: &'a [u8] }
impl<'a> ZipArchive<'a> {
    fn new(data: &'a [u8]) -> Result<Self, io::Error> { Ok(ZipArchive { data } )}
    fn entries(&self) -> Vec<Entry> { vec![] } // Placeholder
    fn read(&self, entry: &Entry) -> Result<Box<dyn io::Read>, io::Error> { Ok(Box::new(io::empty())) } // Placeholder
}
struct Entry { path: std::path::PathBuf } // Placeholder
struct Tree { entries: Vec<Entry> } // Placeholder
impl Tree { 
    fn lookup(&self, path: &str) -> Result<&Entry, io::Error> { Ok(&self.entries[0]) } // Placeholder
    fn files(&self) -> impl Iterator<Item=&Entry> { self.entries.iter() } // Placeholder
}
fn as_tree(entries: Vec<Entry>) -> Result<Tree, io::Error> { Ok(Tree { entries }) } // Placeholder

```

--------------------------------

### Create ZipArchive from Byte Slice (Rust)

Source: https://context7.com/mrkline/piz-rs/llms.txt

This snippet demonstrates how to create a ZipArchive by reading the entire ZIP file into memory as a byte slice. It's suitable for smaller archives. The code parses the archive and iterates through its entries, printing their paths and sizes.

```rust
use std::fs;
use piz::ZipArchive;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Read the entire ZIP file into memory
    let bytes = fs::read("example.zip")?;

    // Parse the ZIP archive from the byte slice
    let archive = ZipArchive::new(&bytes)?;

    // Access the entries in the archive
    println!("Found {} entries", archive.entries().len());

    for entry in archive.entries() {
        println!("Entry: {} ({} bytes)", entry.path, entry.size);
    }

    Ok(())
}
```

--------------------------------

### Access ZIP File Metadata (Rust)

Source: https://context7.com/mrkline/piz-rs/llms.txt

Demonstrates how to access comprehensive metadata about files within a ZIP archive, including timestamps, compression details, and Unix permissions. It iterates through all entries and prints relevant information for each.

```rust
use std::fs::File;
use memmap2::Mmap;
use piz::{ZipArchive, read::{as_tree, CompressionMethod}};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let zip_file = File::open("archive.zip")?;
    let mapping = unsafe { Mmap::map(&zip_file)? };
    let archive = ZipArchive::new(&mapping)?;

    let tree = as_tree(archive.entries())?;

    for entry in archive.entries() {
        println!("File: {}", entry.path);
        println!("  Type: {}", if entry.is_file() { "file" } else { "directory" });
        println!("  Size: {} bytes (compressed: {} bytes)", entry.size, entry.compressed_size);

        match entry.compression_method {
            CompressionMethod::None => println!("  Compression: None (stored)"),
            CompressionMethod::Deflate => println!("  Compression: DEFLATE"),
            CompressionMethod::Unsupported(code) => {
                println!("  Compression: Unsupported (code: {})", code)
            }
        }

        println!("  CRC32: {:08x}", entry.crc32);
        println!("  Last modified: {}", entry.last_modified);

        if let Some(mode) = entry.unix_mode {
            println!("  Unix mode: {:o}", mode);
        }

        if entry.encrypted {
            println!("  WARNING: File is encrypted (decryption not supported)");
        }

        println!();
    }

    Ok(())
}

```

--------------------------------

### Handle Archives with Prepended Data (Rust)

Source: https://context7.com/mrkline/piz-rs/llms.txt

This snippet demonstrates parsing ZIP archives that have arbitrary data prepended, such as self-extracting executables. It memory-maps the file and uses `ZipArchive::with_prepended_data` to obtain both the archive and the offset of the prepended data.

```rust
use std::fs::File;
use memmap2::Mmap;
use piz::ZipArchive;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let zip_file = File::open("self-extracting.exe")?;
    let mapping = unsafe { Mmap::map(&zip_file)? };

    // with_prepended_data returns both the archive and the offset
    let (archive, offset) = ZipArchive::with_prepended_data(&mapping)?;

    if offset > 0 {
        println!("Found {} bytes of prepended data (e.g., executable header)", offset);
    }

    println!("Archive contains {} entries", archive.entries().len());

    Ok(())
}
```

--------------------------------

### Organize ZIP Entries into a File Tree (Rust)

Source: https://context7.com/mrkline/piz-rs/llms.txt

Validates and organizes ZIP archive entries into a hierarchical tree structure. This allows for easier navigation and lookup of files within the archive. It uses the `piz` crate for ZIP handling and `memmap2` for memory mapping.

```rust
use std::fs::File;
use memmap2::Mmap;
use piz::{ZipArchive, read::{as_tree, FileTree}};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let zip_file = File::open("archive.zip")?;
    let mapping = unsafe { Mmap::map(&zip_file)? };
    let archive = ZipArchive::new(&mapping)?;

    // Organize entries into a tree, validating paths and checking for duplicates
    let tree = as_tree(archive.entries())?;

    // Look up files by path
    match tree.lookup("src/main.rs") {
        Ok(metadata) => {
            println!("Found: {} ({} bytes)", metadata.path, metadata.size);
        },
        Err(e) => {
            println!("File not found: {}", e);
        }
    }

    // Iterate over all files only
    println!("\nFiles in archive:");
    for file in tree.files() {
        println!("  {} - {} bytes", file.path, file.size);
    }

    // Iterate over directories only
    println!("\nDirectories in archive:");
    for dir in tree.directories() {
        println!("  {} ({} children)", dir.metadata.path, dir.children.len());
    }

    Ok(())
}

```

--------------------------------

### Parallel ZIP File Extraction (Rust)

Source: https://context7.com/mrkline/piz-rs/llms.txt

Extracts all files from a ZIP archive concurrently using multiple threads for maximum performance. It leverages the `rayon` crate for parallel processing and `piz` for archive reading. Parent directories are created automatically.

```rust
use std::fs::{self, File};
use std::io;
use memmap2::Mmap;
use rayon::prelude::*;
use piz::{ZipArchive, read::{as_tree, FileTree}};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let zip_file = File::open("archive.zip")?;
    let mapping = unsafe { Mmap::map(&zip_file)? };
    let archive = ZipArchive::new(&mapping)?;

    // Create a validated tree of files
    let tree = as_tree(archive.entries())?;

    // Extract all files in parallel using Rayon
    // The readers are Send, so they can be safely used across threads
    tree.files()
        .par_bridge()
        .try_for_each(|entry| -> Result<(), Box<dyn std::error::Error>> {
            // Create parent directories as needed
            if let Some(parent) = entry.path.parent() {
                fs::create_dir_all(parent)?;
            }

            // Read the compressed file from the archive
            let mut reader = archive.read(entry)?;

            // Create the output file
            let mut output = File::create(&*entry.path)?;

            // Decompress and write to disk
            io::copy(&mut reader, &mut output)?;

            println!("Extracted: {}", entry.path);

            Ok(())
        })?;

    println!("\nExtraction complete!");

    Ok(())
}

```

--------------------------------

### Read Single File from Archive (Rust)

Source: https://context7.com/mrkline/piz-rs/llms.txt

This code illustrates how to extract and read the contents of a specific file from a ZIP archive. It involves memory-mapping the archive, creating a tree structure for entry lookup, finding a file by its path, and then copying its decompressed content to a new file.

```rust
use std::fs::{self, File};
use std::io;
use memmap2::Mmap;
use piz::{ZipArchive, read::as_tree};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let zip_file = File::open("archive.zip")?;
    let mapping = unsafe { Mmap::map(&zip_file)? };
    let archive = ZipArchive::new(&mapping)?;

    // Create a tree structure for easier lookup
    let tree = as_tree(archive.entries())?;

    // Look up a specific file by path
    let metadata = tree.lookup("documents/readme.txt")?;

    println!("Found file: {} ({} bytes)", metadata.path, metadata.size);
    println!("Compression: {:?}", metadata.compression_method);
    println!("CRC32: {:08x}", metadata.crc32);

    // Read the file contents
    let mut reader = archive.read(metadata)?;
    let mut output = File::create("extracted_readme.txt")?;

    // Copy the decompressed data to disk
    let bytes_copied = io::copy(&mut reader, &mut output)?;
    println!("Extracted {} bytes", bytes_copied);

    Ok(())
}
```

--------------------------------

### Handle ZIP Archive Errors in Rust

Source: https://context7.com/mrkline/piz-rs/llms.txt

This Rust code snippet demonstrates how to gracefully handle different types of errors that can occur during ZIP archive processing using the piz-rs library. It matches on various `ZipError` variants to provide specific feedback to the user, including I/O errors and issues related to archive structure or content.

```rust
use std::fs::File;
use memmap2::Mmap;
use piz::{ZipArchive, read::{as_tree, FileTree}, result::ZipError};

fn main() {
    match process_archive() {
        Ok(_) => println!("Success!"),
        Err(e) => {
            match e {
                ZipError::InvalidArchive(msg) => {
                    eprintln!("Invalid ZIP file: {}", msg);
                },
                ZipError::UnsupportedArchive(msg) => {
                    eprintln!("Unsupported feature: {}", msg);
                },
                ZipError::NoSuchFile(path) => {
                    eprintln!("File not found in archive: {}", path);
                },
                ZipError::Hierarchy(msg) => {
                    eprintln!("Invalid file hierarchy: {}", msg);
                },
                ZipError::PrependedWithUnknownBytes(offset) => {
                    eprintln!("Archive has {} bytes of prepended data", offset);
                    eprintln!("Use with_prepended_data() to accept this");
                },
                ZipError::InsufficientAddressSpace => {
                    eprintln!("Archive too large for 32-bit address space");
                },
                ZipError::Io(io_err) => {
                    eprintln!("I/O error: {}", io_err);
                },
                _ => {
                    eprintln!("Error: {}", e);
                }
            }
        }
    }
}

fn process_archive() -> Result<(), ZipError> {
    let zip_file = File::open("archive.zip")?;
    let mapping = unsafe { Mmap::map(&zip_file)? };
    let archive = ZipArchive::new(&mapping)?;
    let tree = as_tree(archive.entries())?;

    // Try to find a file that might not exist
    let metadata = tree.lookup("config/settings.json")?;

    // Try to read a file that might be encrypted or unsupported
    let mut reader = archive.read(metadata)?;

    Ok(())
}

```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.