115 lines
No EOL
3.7 KiB
Rust
115 lines
No EOL
3.7 KiB
Rust
#![no_main]
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use libfuzzer_sys::fuzz_target;
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use arbitrary::{Arbitrary};
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use std::fmt::Debug;
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use std::io::{Cursor, Read, Seek, Write};
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use std::iter::{repeat};
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#[derive(Arbitrary,Debug)]
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pub struct File {
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pub name: String,
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pub contents: Vec<Vec<u8>>
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}
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const LARGE_FILE_BUF_SIZE: usize = u32::MAX as usize + 1;
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#[derive(Arbitrary, Clone, Debug)]
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pub struct SparseFilePart {
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pub start: u32,
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pub first_byte: u8,
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pub extra_bytes: Vec<u8>,
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pub repeats: u8
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}
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#[derive(Arbitrary,Debug)]
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pub struct LargeFile {
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pub name: String,
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pub default_pattern_first_byte: u8,
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pub default_pattern_extra_bytes: Vec<u8>,
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pub parts: Vec<SparseFilePart>,
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pub min_extra_length: u16
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}
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#[derive(Arbitrary,Debug)]
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pub enum FileOperation {
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Write {
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file: File,
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options: zip_next::write::FileOptions
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},
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WriteLarge {
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file: LargeFile,
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options: zip_next::write::FileOptions
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},
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ShallowCopy {
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base: Box<FileOperation>,
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new_name: String
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},
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DeepCopy {
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base: Box<FileOperation>,
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new_name: String
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}
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}
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impl FileOperation {
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pub fn get_name(&self) -> String {
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match self {
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FileOperation::Write {file, ..} => &file.name,
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FileOperation::WriteLarge {file, ..} => &file.name,
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FileOperation::ShallowCopy {new_name, ..} => new_name,
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FileOperation::DeepCopy {new_name, ..} => new_name
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}.to_owned()
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}
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}
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fn do_operation<T>(writer: &mut zip_next::ZipWriter<T>,
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operation: &FileOperation) -> Result<(), Box<dyn std::error::Error>>
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where T: Read + Write + Seek {
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match operation {
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FileOperation::Write {file, mut options} => {
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if file.contents.iter().map(Vec::len).sum::<usize>() >= u32::MAX as usize {
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options = options.large_file(true);
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}
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writer.start_file(file.name.to_owned(), options)?;
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for chunk in &file.contents {
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writer.write_all(chunk.as_slice())?;
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}
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}
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FileOperation::WriteLarge {file, mut options} => {
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options = options.large_file(true);
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writer.start_file(file.name.to_owned(), options)?;
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let mut default_pattern = Vec::with_capacity(file.default_pattern_extra_bytes.len() + 1);
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default_pattern.push(file.default_pattern_first_byte);
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default_pattern.extend(&file.default_pattern_extra_bytes);
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let mut sparse_file: Vec<u8> =
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repeat(default_pattern.into_iter()).flatten().take(LARGE_FILE_BUF_SIZE + file.min_extra_length as usize)
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.collect();
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for part in &file.parts {
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let mut bytes = Vec::with_capacity(part.extra_bytes.len() + 1);
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bytes.push(part.first_byte);
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bytes.extend(part.extra_bytes.iter());
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for (index, byte) in repeat(bytes.iter()).take(part.repeats as usize + 1).flatten().enumerate() {
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sparse_file[part.start as usize + index] = *byte;
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}
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}
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writer.write_all(sparse_file.as_slice())?;
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}
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FileOperation::ShallowCopy {base, new_name} => {
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do_operation(writer, base)?;
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writer.shallow_copy_file(&base.get_name(), new_name)?;
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}
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FileOperation::DeepCopy {base, new_name} => {
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do_operation(writer, base)?;
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writer.deep_copy_file(&base.get_name(), new_name)?;
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}
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}
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Ok(())
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}
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fuzz_target!(|data: Vec<FileOperation>| {
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let mut writer = zip_next::ZipWriter::new(Cursor::new(Vec::new()));
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for operation in data {
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let _ = do_operation(&mut writer, &operation);
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}
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let _ = zip_next::ZipArchive::new(writer.finish().unwrap());
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}); |