Minizip zlib contribution fork

Contains the latest bug fixes that having been found all over the internet including the old minizip forum and zlib developer's mailing list along with some additional features. Based on the original work of Gilles Vollant and contributed to by many people over the years.

Features

Streams

The library has been refactored around streams.

Memory Streaming

To unzip from a zip file in memory create a memory stream and pass it to the unzip open functions.

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

// create memory buffer stream and set our buffer
mz_stream_mem_create(&mem_stream);
mz_stream_mem_set_buffer(mem_stream, zip_buffer, zip_buffer_size);
mz_stream_open(mem_stream, NULL, MZ_STREAM_MODE_READ);

void *unz_handle = mz_unzip_open(NULL, mem_stream);
// do unzip operations here

mz_stream_mem_delete(&mem_stream);

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

void *mem_stream = NULL;

// create memory buffer stream and set our buffer
mz_stream_mem_create(&mem_stream);
mz_stream_mem_set_grow(mem_stream, 1);
mz_stream_mem_set_grow_size(mem_stream, 128 * 1024);
mz_stream_open(mem_stream, NULL, MZ_STREAM_MODE_CREATE);

void *zip_handle = mz_zip_open(NULL, 0, 0, mem_stream);
// do zip operations here

mz_stream_mem_delete(&mem_stream);

Compression Methods

BZIP2

• Requires #define HAVE_BZIP2
• Requires BZIP2 library

LZMA

• Requires #define HAVE_LZMA
• Requires BZIP2 library

Encryption

WinZIP AES Encryption

• Requires #define HAVE_AES
• Requires AES library

When zipping with a password it will always use AES 256-bit encryption. When unzipping it will use AES decryption only if necessary. Does not support central directory or local file header encryption.

Whole Archive Encryption

Platforms

Windows RT

• Requires #define IOWIN32_USING_WINRT_API

PKWARE disk spanning

To create an archive with multiple disks use zipOpen3_64 supplying a disk_size value in bytes.

extern zipFile ZEXPORT zipOpen3_64(const void *pathname, int append,
  ZPOS64_T disk_size, zipcharpc* globalcomment, zlib_filefunc64_def* pzlib_filefunc_def);

The central directory is the only data stored in the .zip and doesn't follow disk_size restrictions.

When unzipping it will automatically determine when in needs to span disks.

I/O Buffering

Improves I/O performance by buffering read and write operations.

zlib_filefunc64_def filefunc64 = {0};
ourbuffer_t buffered = {0};

fill_win32_filefunc64(&buffered->filefunc64);
fill_buffer_filefunc64(&filefunc64, buffered);

unzOpen2_64(filename, &filefunc64)

Apple libcompression

• Requires #define HAVE_APPLE_COMPRESSION