Minizip 1.2

Zlib contribution fork that ontains 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

I/O Memory

To unzip from a zip file in memory use fill_memory_filefunc and supply a proper ourmemory_t structure.

zlib_filefunc_def filefunc32 = {0};
ourmemory_t unzmem = {0};

unzmem.size = bufsize;
unzmem.base = (char *)malloc(unzmem.size);
memcpy(unzmem.base, buffer, unzmem.size);
    
fill_memory_filefunc(&filefunc32, &unzmem);

unzOpen2("__notused__", &filefunc32);

To create a zip file in memory use fill_memory_filefunc and supply a proper ourmemory_t structure. It is important not to forget to free zipmem->base when finished. If grow is set, zipmem->base will expand to fit the size of the zip. If grow is not set be sure to fill out zipmem.base and zipmem.size.

zlib_filefunc_def filefunc32 = {0};
ourmemory_t zipmem = {0};

zipmem.grow = 1;

fill_memory_filefunc(&filefunc32, &zipmem);

zipOpen3("__notused__", APPEND_STATUS_CREATE, 0, 0, &filefunc32);

BZIP2

• Requires #define HAVE_BZIP2
• Requires BZIP2 library

Windows RT

• Requires #define IOWIN32_USING_WINRT_API

Additional Features

WinZIP AES Encryption

• Requires #define HAVE_AES
• Requires AES library files

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.

PKWARE disk splitting

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 cross disk boundaries.

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

Doc

• .ZIP File Format Specification