#define WIN32_LEAN_AND_MEAN
#include <windows.h>

#pragma pack(push, 1)
struct zip_header_t {
	DWORD signature;		/* 0x04034b50 */
	WORD ver_needed;
	WORD flags;
	WORD method;
	WORD lastmod_time;
	WORD lastmod_date;
	DWORD crc;
	DWORD compressed_size;
	DWORD uncompressed_size;
	WORD filename_length;
	WORD extra_length;
};

struct zip_eod_t {
	DWORD signature;		/* 0x06054b50 */
	WORD disk_no;
	WORD disk_dirst;
	WORD disk_dir_entries;
	WORD dir_entries;
	DWORD dir_size;
	DWORD dir_offs;
	WORD comment_len;
};

struct zip_dir_t {
	DWORD signature;	/* 0x02014b50 */
	WORD made_by;
	WORD ver_needed;
	WORD flags;
	WORD method;
	WORD lastmod_time;
	WORD lastmod_date;
	DWORD crc;
	DWORD compressed_size;
	DWORD uncompressed_size;
	WORD filename_length;
	WORD extra_length;
	WORD comment_length;
	WORD disk_no;
	WORD internal_attr;
	DWORD external_attr;
	DWORD local_offs;
};
#pragma pack(pop)



/* crc32.c -- compute the CRC-32 of a data stream
 * Copyright (C) 1995 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
/* $Id: crc32.c,v 1.5 1996/01/13 14:55:12 spc Exp $ */

static const unsigned long crc_table[] = {
  0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
  0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
  0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
  0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
  0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
  0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
  0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
  0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
  0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
  0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
  0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
  0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
  0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
  0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
  0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
  0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
  0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
  0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
  0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
  0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
  0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
  0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
  0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
  0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
  0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
  0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
  0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
  0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
  0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
  0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
  0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
  0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
  0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
  0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
  0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
  0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
  0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
  0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
  0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
  0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
  0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
  0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
  0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
  0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
  0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
  0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
  0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
  0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
  0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
  0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
  0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
  0x2d02ef8dL
};

#define CRC32(c, b) (crc_table[((int)(c) ^ (b)) & 0xff] ^ ((c) >> 8))
#define DO1(buf)  crc = CRC32(crc, *buf++)
#define DO2(buf)  DO1(buf); DO1(buf)
#define DO4(buf)  DO2(buf); DO2(buf)
#define DO8(buf)  DO4(buf); DO4(buf)

unsigned long crc32(crc, buf, len)
    register unsigned long crc;           /* crc shift register */
    register const unsigned char *buf;    /* pointer to bytes to pump through */
    int len;                 /* number of bytes in buf[] */
/* Run a set of bytes through the crc shift register.  If buf is a NULL
   pointer, then initialize the crc shift register contents instead.
   Return the current crc in either case. */
{
  if (buf == NULL) return 0L;

  crc = crc ^ 0xffffffffL;
#ifndef NO_UNROLLED_LOOPS
  while (len >= 8) {
    DO8(buf);
    len -= 8;
  }
#endif
  if (len) do {
    DO1(buf);
  } while (--len);
  return crc ^ 0xffffffffL;     /* (instead of ~c for 64-bit machines) */
}


static void zip_putcurtime(WORD *f_time, WORD *f_date)
{
	SYSTEMTIME systime;

	GetSystemTime(&systime);
	if ((systime.wYear < 1999) || (systime.wYear > 2010))
		systime.wYear = 2004;
	if (systime.wMonth < 1 || systime.wMonth > 12) systime.wMonth = 1;
	if (systime.wDay < 1 || systime.wDay > 31) systime.wDay = 10;

	*f_date =
		((systime.wYear-1980) << 9) |
		(systime.wMonth << 5) |
		systime.wDay;

	*f_time =
		(systime.wHour << 11) |
		(systime.wMinute << 5) |
		(systime.wSecond / 2);
}

static unsigned long zip_calc_crc32(HANDLE hFileIn)
{
	unsigned long reg, i;
	unsigned char buf[1024];
	SetFilePointer(hFileIn, 0, NULL, FILE_BEGIN);
	for (reg=0;;) {
		i = 0;
		if (ReadFile(hFileIn, buf, sizeof(buf), &i, NULL) == 0) break;
		if (i == 0) break;
		reg = crc32(reg, buf, i);
	}
	SetFilePointer(hFileIn, 0, NULL, FILE_BEGIN);
	return reg;
}

int zip_store(char *in, char *out, char *store_as)
{
	HANDLE hFileIn, hFileOut;
	struct zip_header_t hdr1;
	struct zip_eod_t eod1;
	struct zip_dir_t dir1;
	char buf[1024];
	unsigned long i, j, offs;

	hFileIn = CreateFile(in, GENERIC_READ, FILE_SHARE_READ|FILE_SHARE_WRITE,
		NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
	if (hFileIn == INVALID_HANDLE_VALUE || hFileIn == NULL)
		return 1;
	hFileOut = CreateFile(out, GENERIC_WRITE, FILE_SHARE_READ|FILE_SHARE_WRITE,
		NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
	if (hFileOut == INVALID_HANDLE_VALUE || hFileOut == NULL) {
		CloseHandle(hFileIn);
		return 2;
	}

	memset(&hdr1, '\0', sizeof(hdr1));
	memset(&dir1, '\0', sizeof(dir1));
	memset(&eod1, '\0', sizeof(eod1));
	offs = 0;

	hdr1.signature = 0x04034b50;
	dir1.ver_needed = hdr1.ver_needed = 10;
	dir1.flags = hdr1.flags = 0;
	dir1.method = hdr1.method = 0;
	zip_putcurtime(&hdr1.lastmod_time, &hdr1.lastmod_date);
	dir1.lastmod_time = hdr1.lastmod_time;
	dir1.lastmod_date = hdr1.lastmod_date;
	hdr1.crc = zip_calc_crc32(hFileIn);
	dir1.crc = hdr1.crc;

	hdr1.compressed_size = GetFileSize(hFileIn, NULL);
	dir1.compressed_size = hdr1.compressed_size;
	hdr1.uncompressed_size = GetFileSize(hFileIn, NULL);
	dir1.uncompressed_size = hdr1.uncompressed_size;
	hdr1.filename_length = lstrlen(store_as);
	dir1.filename_length = hdr1.filename_length;
	dir1.extra_length = hdr1.extra_length = 0;

	dir1.local_offs = offs;

	WriteFile(hFileOut, &hdr1, sizeof(hdr1), &i, NULL);
	offs += sizeof(hdr1);
	WriteFile(hFileOut, store_as, lstrlen(store_as), &i, NULL);
	offs += lstrlen(store_as);
	SetFilePointer(hFileIn, 0, NULL, FILE_BEGIN);
	for (;;) {
		i = 0;
		if (ReadFile(hFileIn, buf, sizeof(buf), &i, NULL) == 0) break;
		if (i == 0) break;
		WriteFile(hFileOut, buf, i, &j, NULL);
		offs += i;
	}

	eod1.dir_offs = offs;

	dir1.signature = 0x02014b50;
	dir1.made_by = 20;		/* MSDOS, PKZIP 2.0 */
	dir1.internal_attr = 0;
	dir1.external_attr = 0x20;	/* FA_ARCHIVE */
	WriteFile(hFileOut, &dir1, sizeof(dir1), &i, NULL);
	offs += sizeof(dir1);
	WriteFile(hFileOut, store_as, lstrlen(store_as), &i, NULL);
	offs += lstrlen(store_as);

	eod1.signature = 0x06054b50;
	eod1.disk_no = 0;
	eod1.disk_dirst = 0;
	eod1.disk_dir_entries = 1;
	eod1.dir_entries = eod1.disk_dir_entries;
	eod1.dir_size = offs - eod1.dir_offs;
	eod1.comment_len = 0;
	WriteFile(hFileOut, &eod1, sizeof(eod1), &i, NULL);

	CloseHandle(hFileOut);
	CloseHandle(hFileIn);
	return 0;
}
