LiteZip and LiteUnzip

#ifdef WIN32
#include <windows.h>
#include <tchar.h>
#else
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dlfcn.h>
#include <errno.h>
#include <unistd.h>
typedef void * HMODULE;
typedef char TCHAR;
#define _T(a) (a)
#endif

// Include LiteUnzip.h for unzipping a ZIP archive
#include "../LiteUnzip.h"





// Where we store the pointers to LiteUnzip.dll's functions that we call
UnzipOpenFilePtr		*lpUnzipOpenFile;
UnzipGetItemPtr			*lpUnzipGetItem;
UnzipItemToBufferPtr	*lpUnzipItemToBuffer;
UnzipClosePtr			*lpUnzipClose;
UnzipFormatMessagePtr	*lpUnzipFormatMessage;






/************************** main() *************************
 * Program entry point.
 */

int main()
{
	HMODULE		unzipDll;
	HUNZIP		huz;
	DWORD		result;

#ifdef WIN32
	// Open the LiteUnzip.DLL. Note: If LiteUnzip.dll is not placed in a path that can be found
	// by this app, then LoadLibrary will fail. So, either copy LiteUnzip.dll to the same
	// directory as this EXE, or to some directory that Windows is set to search.
	if ((unzipDll = (HMODULE)LoadLibrary(_T("../LiteUnzip.dll"))))
	{
		// Get the addresses of 5 functions in LiteUnzip.dll -- UnzipOpenFile(), UnzipGetItem()
		// UnzipItemToFile(), UnzipClose(), and UnzipFormatMessage.
		lpUnzipOpenFile = (UnzipOpenFilePtr *)GetProcAddress(unzipDll, UNZIPOPENFILENAME);
		lpUnzipGetItem = (UnzipGetItemPtr *)GetProcAddress(unzipDll, UNZIPGETITEMNAME);
		lpUnzipItemToBuffer = (UnzipItemToBufferPtr *)GetProcAddress(unzipDll, UNZIPITEMTOBUFFERNAME);
		lpUnzipClose = (UnzipClosePtr *)GetProcAddress(unzipDll, UNZIPCLOSENAME);
		lpUnzipFormatMessage = (UnzipFormatMessagePtr *)GetProcAddress(unzipDll, UNZIPFORMATMESSAGENAME);
#else
	if ((unzipDll = (HMODULE)dlopen("../LiteUnzip/libliteunzip.so", RTLD_LAZY)))
	{
		// Get the addresses of 5 functions in LiteUnzip.dll -- UnzipOpenFile(), UnzipGetItem()
		// UnzipItemToFile(), UnzipClose(), and UnzipFormatMessage.
		lpUnzipOpenFile = (UnzipOpenFilePtr *)dlsym(unzipDll, UNZIPOPENFILENAME);
		lpUnzipGetItem = (UnzipGetItemPtr *)dlsym(unzipDll, UNZIPGETITEMNAME);
		lpUnzipItemToBuffer = (UnzipItemToBufferPtr *)dlsym(unzipDll, UNZIPITEMTOBUFFERNAME);
		lpUnzipClose = (UnzipClosePtr *)dlsym(unzipDll, UNZIPCLOSENAME);
		lpUnzipFormatMessage = (UnzipFormatMessagePtr *)dlsym(unzipDll, UNZIPFORMATMESSAGENAME);
#endif
		// Open a ZIP archive on disk named "test.zip".
		if (!(result = lpUnzipOpenFile(&huz, _T("test.zip"), 0)))
		{
			ZIPENTRY		ze;
			DWORD			numitems;
			unsigned char	*buffer;

			// Find out how many items are in the archive.
			ze.Index = (DWORD)-1;
			if ((result = lpUnzipGetItem(huz, &ze))) goto bad2;
			numitems = ze.Index;

			// Unzip each item, using the name stored (in the zip) for that item.
			for (ze.Index = 0; ze.Index < numitems; ze.Index++)
			{
				// Get info about the next item
				if ((result = lpUnzipGetItem(huz, &ze))) goto bad2;
				{					
					// Allocate a memory buffer to decompress the item
#ifdef WIN32
					if (!(buffer = GlobalAlloc(GMEM_FIXED, ze.UncompressedSize)))
#else
					if (!(buffer = malloc(ze.UncompressedSize)))
#endif
					{
#ifdef WIN32
						TCHAR msg[160];

						msg[0] = 0;
						FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, 0, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), &msg[0], 160, 0);
						MessageBox(0, &msg[0], _T("Error"), MB_OK);
#else
						printf("ERROR: %s\n", strerror(errno));
#endif
						break;
					}
					
					// Decompress the item into our buffer
					if ((result = lpUnzipItemToBuffer(huz, buffer, ze.UncompressedSize, &ze)))
					{
#ifdef WIN32
						GlobalFree(buffer);
#else
						free(buffer);
#endif
bad2:					lpUnzipClose(huz);
						goto bad;
					}

#ifdef WIN32
					// Here we would do something with the contents of buffer. It contains
					// ze.UncompressedSize bytes. We'll just display it to the console.
					WriteFile(GetStdHandle(STD_OUTPUT_HANDLE), buffer, ze.UncompressedSize, &ze.CompressedSize, 0);

					// We have no further use for the buffer, so we must free it.
					GlobalFree(buffer);
#else
					fwrite(buffer, ze.UncompressedSize, 1, stdout);
					free(buffer);
#endif
				}
			}

			// Done unzipping files, so close the ZIP archive.
			lpUnzipClose(huz);
		}
		else
		{
			TCHAR	msg[100];

bad:		lpUnzipFormatMessage(result, msg, sizeof(msg));
#ifdef WIN32
			MessageBox(0, &msg[0], _T("Error"), MB_OK);
#else
			printf("ERROR: %s\n", &msg[0]);
#endif
		}

		// Free the LiteUnzip.DLL
#ifdef WIN32
		FreeLibrary(unzipDll);
#else
		dlclose(unzipDll);
#endif
	}
	else
	{
#ifdef WIN32
		TCHAR msg[160];

		msg[0] = 0;
		FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, 0, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), &msg[0], 160, 0);
		MessageBox(0, &msg[0], _T("Error"), MB_OK);
#else
		printf("ERROR: %s\n", dlerror());
#endif
	}

	return(0);
}