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  1. b70b824 Version 2.3.4. by Nathan Moinvaziri · 3 hours ago dev master
  2. 0a9282d Added support for only using either compression or decompression with continued support for raw mode. by Nathan Moinvaziri · 3 hours ago
  3. 6be5ec8 Fixed formatting. by Nathan Moinvaziri · 5 hours ago
  4. 5d4c61f Moved zlib installation instructions. by Nathan Moinvaziri · 5 hours ago
  5. 4bcaf52 Added windows install instructions #269 by Nathan Moinvaziri · 5 hours ago

Minizip 2.3.4

This library is a refactoring of the minizip contribution found in the zlib distribution and is supported on Windows, macOS, and Linux. The motivation for this work has been the inclusion of advanced features, improvements in code maintainability and readability, and the reduction of duplicate code. It is based on the original work of Gilles Vollant that has been contributed to by many people over the years.

Dev: Dev Branch Status Master: Master Branch Status

For my older fork of this library checkout the 1.2 branch. For the original work maintained by Mark Adler checkout the zlib minizip contrib.


To generate project files for your platform:

  1. Download and install cmake.
  2. Download and install zlib if it is not installed on your system.
  3. Run cmake in the minizip directory.
cmake --build .

Build Options

| Name | Description | Default Value | |:- |:-|:-:| | USE_ZLIB | Enables ZLIB compression | ON | | USE_BZIP2 | Enables BZIP2 compression | ON | | USE_LZMA | Enables LZMA compression | ON | | USE_PKCRYPT | Enables PKWARE traditional encryption | ON | | COMPRESS_ONLY | Only support compression | OFF | | DECOMPRESS_ONLY | Only support decompression | OFF | | BUILD_TEST | Builds minizip test executable | OFF |

Zlib Installation (Windows)

Option 1. Install the zlib package to the Program Files directory with an Administrator command prompt.

cmake --build . --config Release --target INSTALL

Option 2. Compile zlib in minizip's lib directory.

cmake .
cmake --build . --config Release

Navigate back to the minizip directory and before building run:

cmake . -DZLIB_LIBRARY=lib\zlib\release\zlibstatic.lib -DZLIB_INCLUDE_DIR=lib\zlib\


| File(s) | Description | Required | |:- |:-|:-:| | minizip.c | Sample application | No | | mz_compat.* | Minizip 1.0 compatibility layer | No | | mz.h | Error codes and flags | Yes | | mz_os* | OS specific helper functions | Encryption, Disk Splitting | | mz_strm.* | Stream interface | Yes | | mz_strm_aes.* | WinZIP AES stream | No | | mz_strm_buf.* | Buffered stream | No | | mz_strm_bzip.* | BZIP2 stream using libbzip2 | No | | mz_strm_lzma.* | LZMA stream using liblzma | zlib or liblzma | | mz_strm_mem.* | Memory stream | Yes | | mz_strm_split.* | Disk splitting stream | No | | mz_strm_pkcrypt.* | PKWARE traditional encryption stream | No | | mz_strm_posix.* | File stream using Posix functions | Non-windows systems | | mz_strm_win32.* | File stream using Win32 API functions | Windows systems | | mz_strm_zlib.* | Deflate stream using zlib | zlib or liblzma | | mz_zip.* | Zip functionality | Yes |


Compression Methods


  • Requires cmake . -DUSE_BZIP2=ON or #define HAVE_BZIP2
  • Requires BZIP2 library


  • Requires cmake . -DUSE_LZMA=ON or #define HAVE_LZMA
  • Requires liblzma library


WinZIP AES Encryption

  • Requires cmake . -DUSE_AES=ON or #define HAVE_AES
  • Requires Brian Gladman's AES and SHA libraries

When zipping with a password it will always use AES 256-bit encryption. When unzipping it will use AES decryption only if necessary.

Disabling All Encryption

To disable encryption use the following cmake commands:

cmake . -DUSE_AES=OFF

NTFS Timestamps

Support has been added for UTC last modified, last accessed, and creation dates.


This library has been refactored around streams.

Memory Streaming

To unzip from a zip file in memory pass the memory stream to the open function.

uint8_t *zip_buffer = NULL;
int32_t zip_buffer_size = 0;
void *mem_stream = NULL;

// fill zip_buffer with zip contents
mz_stream_mem_set_buffer(mem_stream, zip_buffer, zip_buffer_size);
mz_stream_open(mem_stream, NULL, MZ_OPEN_MODE_READ);

void *zip_handle = mz_zip_open(mem_stream, MZ_OPEN_MODE_READ);
// do unzip operations


To create a zip file in memory first create a growable memory stream and pass it to the open function.

void *mem_stream = NULL;

mz_stream_mem_set_grow_size(mem_stream, (128 * 1024));
mz_stream_open(mem_stream, NULL, MZ_OPEN_MODE_CREATE);

void *zip_handle = mz_zip_open(mem_stream, MZ_OPEN_MODE_WRITE);
// do unzip operations


For a complete example, see test_zip_mem() in test.c.

Buffered Streaming

By default the library will read bytes typically one at a time. The buffered stream allows for buffered read and write operations to improve I/O performance.

void *stream = NULL;
void *buf_stream = NULL;

// do open os stream

mz_stream_buffered_open(buf_stream, NULL, MZ_OPEN_MODE_READ);
mz_stream_buffered_set_base(buf_stream, stream);

void *zip_handle = mz_zip_open(buf_stream, MZ_OPEN_MODE_READ);

Disk Splitting Stream

To create an archive with multiple disks use the disk splitting stream and supply a disk size value in bytes.

void *stream = NULL;
void *split_stream = NULL;


mz_stream_split_set_prop_int64(split_stream, MZ_STREAM_PROP_DISK_SIZE, 64 * 1024);

mz_stream_set_base(split_stream, stream);

mz_stream_open(split_stream, path..

void *zip_handle = mz_zip_open(split_stream, MZ_OPEN_MODE_WRITE);

Windows RT

  • Requires #define MZ_WINRT_API


  • Archives are required to have a central directory.
  • Central directory header values should be correct and it is necessary for the compressed size to be accurate for AES encryption.
  • Central directory encryption is not supported due to licensing restrictions mentioned by PKWARE in their zip appnote.
  • Central directory is the only data stored on the last disk of a split-disk archive and doesn't follow disk size restrictions.