epub_zip_guard.c

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#include <stddef.h>
#include <stdint.h>
 
#include "epub_internal.h"
#include "ra8_check.h"
#include "ra8_decomp_limits.h"

static const char* const s_tag_zip_guard = "epub_zip";
 
RA8_PRIV ra8_err_t priv_epub_zip_guard_archive(mz_zip_archive* zip)
{
  RA8_CHECK_NULL_PTR(zip, s_tag_zip_guard, "guard archive: null zip");
  const ra8_decomp_limits_t lim = ra8_decomp_limits_default();
  const mz_uint             num = mz_zip_reader_get_num_files(zip);
  if ((uint64_t)num > (uint64_t)lim.max_entries) {
    return k_ra8_err_decomp_entries;
  }
  return k_ra8_ok;
}
 
RA8_PRIV ra8_err_t priv_epub_zip_guard_entry(const mz_zip_archive_file_stat* st)
{
  RA8_CHECK_NULL_PTR(st, s_tag_zip_guard, "guard entry: null stat");
  const ra8_decomp_limits_t lim = ra8_decomp_limits_default();
  return ra8_decomp_check_declared(&lim, (uint64_t)st->m_comp_size, (uint64_t)st->m_uncomp_size);
}