Option Explicit
Private Declare Function CreateFile Lib "Kernel32" Alias "CreateFileA" (ByVal lpFileName As String, ByVal dwDesiredAccess As Long, ByVal dwShareMode As Long, lpSecurityAttributes As Long, ByVal dwCreationDisposition As Long, ByVal dwFlagsAndAttributes As Long, ByVal hTemplateFile As Long) As Long
Private Declare Function ReadFile Lib "Kernel32" (ByVal hFile As Long, lpBuffer As Any, ByVal nNumberOfBytesToRead As Long, lpNumberOfBytesRead As Long, lpOverlapped As Long) As Long
Private Declare Function WriteFile Lib "Kernel32" (ByVal hFile As Long, lpBuffer As Any, ByVal nNumberOfBytesToWrite As Long, lpNumberOfBytesWritten As Long, lpOverlapped As Long) As Long
Private Declare Function CloseHandle Lib "Kernel32" (ByVal hObject As Long) As Long
Private Declare Function GlobalAlloc Lib "Kernel32" (ByVal wFlags As Long, ByVal dwBytes As Long) As Long
Private Declare Function GlobalFree Lib "Kernel32" (ByVal hMem As Long) As Long
Private Declare Function GetFileSize Lib "Kernel32" (ByVal hFile As Long, lpFileSizeHigh As Long) As Long
Private Declare Sub ZeroMemory Lib "Kernel32" Alias "RtlZeroMemory" (dest As Any, ByVal numbytes As Long)
Private Declare Function SetFilePointer Lib "Kernel32" (ByVal hFile As Long, ByVal lDistanceToMove As Long, lpDistanceToMoveHigh As Long, ByVal dwMoveMethod As Long) As Long
Private Declare Sub GetSystemTime Lib "Kernel32" (lpSystemTime As SYSTEMTIME)
Private Declare Sub CopyMemory Lib "Kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As Long)
 
Private Const FILE_BEGIN = 0
Private Const GENERIC_READ = &H80000000
Private Const GENERIC_WRITE = &H40000000
Private Const FILE_SHARE_READ = &H1
Private Const CREATE_ALWAYS = 2
Private Const OPEN_EXISTING = 3
Private Const INVALID_HANDLE_VALUE = -1
Private Const GMEM_FIXED = &H0
Private Const GMEM_ZEROINIT = &H40
Private Const GPTR = (GMEM_FIXED Or GMEM_ZEROINIT)
 
Private Type LOCAL_FILE_HEADER
 Signature As Long          'Firma &H04034b50
 ver_needed As Integer      'Version minima de software necesaria para extraer el archivo
 Flags As Integer           'Opciones
 method As Integer          'Metodo de compresion
 lastmod_time As Integer    'Tiempo de ultima modificacion
 lastmod_date As Integer    'Fecha de ultima modificacion
 crcLO As Integer                'CRC del file
 crcHI As Integer
 compressed_sizeLO As Integer    'Tamaño de file comprimido
 compressed_sizeHI As Integer
 uncompressed_sizeLO As Integer  'Tamaño del file sin comprimir
 uncompressed_sizeHI As Integer
 filename_length As Integer 'Longitud del nombre del Archivo
 extra_length As Integer    'Longitud de "InFormacion Adicional" ¿?
End Type
 
Private Type CENTRAL_DIRECTORY_STRUCTURE
 Signature As Long          'FIRMA &H02014b50
 made_by As Integer         'Indica SO y version de software donde se comprimio el file
 ver_needed As Integer      'Version minima de software necesaria para extraer el archivo
 Flags As Integer           'Opciones
 method As Integer          'Metodo de compresion
 lastmod_time As Integer    'Tiempo de ultima modificacion
 lastmod_date As Integer    'Fecha de ultima modificacion
 crc As Long                'CRC del file
 compressed_size As Long    'Tamaño de file comprimido
 uncompressed_size As Long  'Tamaño del file sin comprimir
 filename_length As Integer 'Longitud del nombre del Archivo
 extra_length As Integer    'Longitud de "InFormacion Adicional" ¿?
 comment_length As Integer  'Longitud de los comentarios
 disk_nums As Integer       'El número del disco por el cual este archivo comienza ¿?
 internal_attr As Integer   'Opciones entre ellas: Si el file tiene datos ASCII(texto) o Binarios
 external_attrLO As Integer 'Opciones entre ellas: Tipo de Sistema de Archivos
 external_attrHI As Integer '
 local_offs As Long         'N° de Byte donde comienza el correspondiente
                            'LOCAL_FILE_HEADER de esta struct CENTRAL_DIRECTORY_STRUCTURE
End Type
 
Private Type END_CENTRAL_DIR
 Signature As Long           'FIrma &H06054b50
 disk_nums As Integer        '"El número de este disco, que contiene el expediente de extremo central del directorio" ¿?
 disk_dirstart As Integer    '"El número del disco en el cual el directorio central comienza" ¿?
 disk_dir_entries As Integer 'El número de entradas en el central directory en este disco
 dir_entries As Integer      'El número total de archivos en el zipfile
 dir_size As Long            'El tamaño (en bytes) de la o las CENTRAL_DIRECTORY_STRUCTURE que contenga el zip
 dir_offs As Long            'N° de Byte donde comienza la CENTRAL_DIRECTORY_STRUCTURE o la primera CENTRAL_DIRECTORY_STRUCTURE
                             'si es que hay más de una
 comment_length As Integer   'Longitud de los Comentarios
End Type
 
Private Type SYSTEMTIME
 wYear As Integer
 wMonth As Integer
 wDayOfWeek As Integer
 wDay As Integer
 wHour As Integer
 wMinute As Integer
 wSecond As Integer
 wMilliseconds As Integer
End Type
 
Private Type HL_DWORD
 LoWord As Integer
 HiWord As Integer
End Type
 
Private CRCTable(256) As Long
 
Private Sub SetCRCTable()
 'Code CRC32 de www.vbaccelerator.com
 On Error Resume Next
 Dim dwPolynomial As Long, dwCrc As Long, I As Integer, j As Integer
 dwPolynomial = &HEDB88320
 
 For I = 0 To 255
  dwCrc = I
  For j = 8 To 1 Step -1
   If (dwCrc And 1) Then
   dwCrc = ((dwCrc And &HFFFFFFFE) \ 2&) And &H7FFFFFFF
   dwCrc = dwCrc Xor dwPolynomial
   Else
   dwCrc = ((dwCrc And &HFFFFFFFE) \ 2&) And &H7FFFFFFF
   End If
  Next
  CRCTable(I) = dwCrc
 Next
End Sub
 
Private Function GetCRC32(Buffer As String) As Long
'Code CRC32 de www.vbaccelerator.com
On Error Resume Next
Dim crc As Long, I As Long, iLookup As Integer
 
crc = &HFFFFFFFF
 
For I = 1 To Len(Buffer)
 iLookup = (crc And &HFF) Xor Asc(Mid(Buffer, I, 1))
 crc = ((crc And &HFFFFFF00) \ &H100) And 16777215
 crc = crc Xor CRCTable(iLookup)
Next
 
GetCRC32 = Not (crc)
End Function
 
Public Function Zipea(ffile As String, fzip As String, fname As String) As Boolean
On Error Resume Next
 Dim lfh As LOCAL_FILE_HEADER
 Dim cds As CENTRAL_DIRECTORY_STRUCTURE
 Dim ecd As END_CENTRAL_DIR
 Dim st As SYSTEMTIME
 Dim File As String, FPtr As Long
 Dim sz As Long, Dw As Long, o As Long
 Dim hFile As Long, hZip As Long
 Dim HL As HL_DWORD
 Dim CRC32 As Long
 
 o = 0
 
 hFile = CreateFile(ffile, GENERIC_READ, FILE_SHARE_READ, ByVal 0&, OPEN_EXISTING, 0, 0)
 If (hFile = INVALID_HANDLE_VALUE) Then Zipea = False: Exit Function
 
 hZip = CreateFile(fzip, GENERIC_WRITE, FILE_SHARE_READ, ByVal 0&, CREATE_ALWAYS, 0, 0)
 If (hZip = INVALID_HANDLE_VALUE) Then CloseHandle (hFile): Zipea = False: Exit Function
 
 ZeroMemory ByVal lfh, Len(lfh)
 ZeroMemory ByVal cds, Len(cds)
 ZeroMemory ByVal ecd, Len(ecd)
 
 Call GetSystemTime(st)
 If (st.wHour > 12) Then st.wHour = st.wHour - 12
 
 sz = GetFileSize(hFile, 0)
 
 lfh.Signature = &H4034B50
 lfh.ver_needed = 10
 lfh.Flags = 0
 lfh.method = 0
 lfh.lastmod_time = (st.wHour) * (2 ^ 11) Or (st.wMinute * (2 ^ 5)) Or (st.wSecond / 2)
 lfh.lastmod_date = ((st.wYear - 1980) * (2 ^ 9)) Or (st.wMonth * (2 ^ 5)) Or (st.wDay)
 
 CopyMemory HL, sz, 4
 
 lfh.uncompressed_sizeHI = HL.HiWord And &HFFFF
 lfh.uncompressed_sizeLO = HL.LoWord And &HFFFF
 lfh.compressed_sizeHI = HL.HiWord And &HFFFF
 lfh.compressed_sizeLO = HL.LoWord And &HFFFF
 lfh.filename_length = Len(fname)
 lfh.extra_length = 0
 
 cds.Signature = &H2014B50
 cds.made_by = 20           'MSDOS=0, PKZIP 2.0 =20
 cds.ver_needed = 10
 cds.Flags = 0
 cds.method = 0
 cds.lastmod_time = (st.wHour) * (2 ^ 11) Or (st.wMinute * (2 ^ 5)) Or (st.wSecond / 2)
 cds.lastmod_date = ((st.wYear - 1980) * (2 ^ 9)) Or (st.wMonth * (2 ^ 5)) Or (st.wDay)
 cds.compressed_size = sz
 cds.uncompressed_size = sz
 cds.filename_length = Len(fname)
 cds.extra_length = 0
 cds.comment_length = 0
 cds.disk_nums = 0
 cds.local_offs = 0
 cds.internal_attr = 0      'Datos Binarios
 cds.external_attrLO = &H20 'FAT_32 (&H20=32)
 cds.external_attrHI = &H0
 
 
 Call SetFilePointer(hFile, 0, 0, FILE_BEGIN)
 FPtr = GlobalAlloc(GPTR, sz)
 If (FPtr = 0) Then Zipea = False: GoTo Cierra
 
  Call ReadFile(hFile, ByVal FPtr, sz, Dw, ByVal 0)
  If (Dw = 0) Then Zipea = False: GoTo Cierra
 
  File = Space$(Dw)
  CopyMemory ByVal File, ByVal FPtr, Dw
 
 Call SetCRCTable
 
 CRC32 = GetCRC32(File)
 
 CopyMemory HL, CRC32, 4
 
 lfh.crcLO = HL.LoWord And &HFFFF
 lfh.crcHI = HL.HiWord And &HFFFF
 
 cds.crc = CRC32
 
 Call WriteFile(hZip, lfh, Len(lfh), Dw, ByVal 0&)
 Call WriteFile(hZip, ByVal fname, Len(fname), Dw, ByVal 0&)
 Call WriteFile(hZip, ByVal File, sz, Dw, ByVal 0&)
 
 GlobalFree (FPtr)
 o = o + (Len(lfh) + Len(fname) + sz)
 
 ecd.dir_offs = o
 
 Call WriteFile(hZip, cds, Len(cds), Dw, ByVal 0&)
 Call WriteFile(hZip, ByVal fname, Len(fname), Dw, ByVal 0&)
 o = o + (Len(cds) + Len(fname))
 
 ecd.Signature = &H6054B50
 ecd.disk_nums = 0
 ecd.disk_dirstart = 0
 ecd.disk_dir_entries = 1
 ecd.dir_entries = 1
 ecd.dir_size = o - ecd.dir_offs
 ecd.comment_length = 0
 Call WriteFile(hZip, ecd, Len(ecd), Dw, ByVal 0&)
 
 Zipea = True
Cierra:
 CloseHandle (hFile): CloseHandle (hZip)
End Function
 
 
 
Private Sub Form_Load()
If Zipea("C:\SearchDesckTop.exe", "C:\nombrefile.zip", "SearchDesckTop.exe") = True Then MsgBox "Compresion de Archivo Exitosa" Else Beep
End Sub