/*
 * TAR format fuzzer for libarchive
 * Tests all TAR variants: ustar, pax, gnutar, v7, oldgnu
 */
#include <stddef.h>
#include <stdint.h>
#include <vector>

#include "archive.h"
#include "archive_entry.h"
#include "fuzz_helpers.h"

static constexpr size_t kMaxInputSize = 512 * 1024;

extern "C" int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len) {
  if (len == 0 || len > kMaxInputSize) {
    return 0;
  }

  struct archive *a = archive_read_new();
  if (a == NULL) {
    return 0;
  }

  archive_read_support_format_tar(a);
  archive_read_support_format_gnutar(a);
  archive_read_support_filter_all(a);

  // Enable various TAR options
  archive_read_set_options(a, "tar:read_concatenated_archives,tar:mac-ext");

  Buffer buffer = {buf, len, 0};
  if (archive_read_open(a, &buffer, NULL, reader_callback, NULL) != ARCHIVE_OK) {
    archive_read_free(a);
    return 0;
  }

  std::vector<uint8_t> data_buffer(4096, 0);
  struct archive_entry *entry;

  while (archive_read_next_header(a, &entry) == ARCHIVE_OK) {
    // Exercise all metadata accessors
    archive_entry_pathname(entry);
    archive_entry_pathname_w(entry);
    archive_entry_size(entry);
    archive_entry_mtime(entry);
    archive_entry_atime(entry);
    archive_entry_ctime(entry);
    archive_entry_mode(entry);
    archive_entry_uid(entry);
    archive_entry_gid(entry);
    archive_entry_uname(entry);
    archive_entry_gname(entry);
    archive_entry_symlink(entry);
    archive_entry_hardlink(entry);
    archive_entry_rdev(entry);
    archive_entry_devmajor(entry);
    archive_entry_devminor(entry);

    // Test sparse file handling
    archive_entry_sparse_reset(entry);
    int64_t offset, length;
    while (archive_entry_sparse_next(entry, &offset, &length) == ARCHIVE_OK) {
      (void)offset;
      (void)length;
    }

    // Test xattr handling
    archive_entry_xattr_reset(entry);
    const char *name;
    const void *value;
    size_t size;
    while (archive_entry_xattr_next(entry, &name, &value, &size) == ARCHIVE_OK) {
      (void)name;
      (void)value;
      (void)size;
    }

    ssize_t r;
    while ((r = archive_read_data(a, data_buffer.data(), data_buffer.size())) > 0)
      ;
  }

  archive_read_free(a);
  return 0;
}