annotate mupdf-source/thirdparty/zlib/old/visual-basic.txt @ 46:7ee69f120f19 default tip

>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 See below some functions declarations for Visual Basic.
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3 Frequently Asked Question:
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5 Q: Each time I use the compress function I get the -5 error (not enough
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6 room in the output buffer).
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8 A: Make sure that the length of the compressed buffer is passed by
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9 reference ("as any"), not by value ("as long"). Also check that
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10 before the call of compress this length is equal to the total size of
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11 the compressed buffer and not zero.
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14 From: "Jon Caruana" <jon-net@usa.net>
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15 Subject: Re: How to port zlib declares to vb?
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16 Date: Mon, 28 Oct 1996 18:33:03 -0600
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18 Got the answer! (I haven't had time to check this but it's what I got, and
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19 looks correct):
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20
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21 He has the following routines working:
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22 compress
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23 uncompress
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24 gzopen
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25 gzwrite
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26 gzread
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27 gzclose
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28
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29 Declares follow: (Quoted from Carlos Rios <c_rios@sonda.cl>, in Vb4 form)
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30
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31 #If Win16 Then 'Use Win16 calls.
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32 Declare Function compress Lib "ZLIB.DLL" (ByVal compr As
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33 String, comprLen As Any, ByVal buf As String, ByVal buflen
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34 As Long) As Integer
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35 Declare Function uncompress Lib "ZLIB.DLL" (ByVal uncompr
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36 As String, uncomprLen As Any, ByVal compr As String, ByVal
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37 lcompr As Long) As Integer
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38 Declare Function gzopen Lib "ZLIB.DLL" (ByVal filePath As
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39 String, ByVal mode As String) As Long
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40 Declare Function gzread Lib "ZLIB.DLL" (ByVal file As
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41 Long, ByVal uncompr As String, ByVal uncomprLen As Integer)
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42 As Integer
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43 Declare Function gzwrite Lib "ZLIB.DLL" (ByVal file As
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44 Long, ByVal uncompr As String, ByVal uncomprLen As Integer)
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45 As Integer
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46 Declare Function gzclose Lib "ZLIB.DLL" (ByVal file As
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47 Long) As Integer
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48 #Else
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49 Declare Function compress Lib "ZLIB32.DLL"
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50 (ByVal compr As String, comprLen As Any, ByVal buf As
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51 String, ByVal buflen As Long) As Integer
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52 Declare Function uncompress Lib "ZLIB32.DLL"
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53 (ByVal uncompr As String, uncomprLen As Any, ByVal compr As
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54 String, ByVal lcompr As Long) As Long
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55 Declare Function gzopen Lib "ZLIB32.DLL"
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56 (ByVal file As String, ByVal mode As String) As Long
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57 Declare Function gzread Lib "ZLIB32.DLL"
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58 (ByVal file As Long, ByVal uncompr As String, ByVal
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59 uncomprLen As Long) As Long
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60 Declare Function gzwrite Lib "ZLIB32.DLL"
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61 (ByVal file As Long, ByVal uncompr As String, ByVal
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62 uncomprLen As Long) As Long
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63 Declare Function gzclose Lib "ZLIB32.DLL"
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64 (ByVal file As Long) As Long
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65 #End If
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66
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67 -Jon Caruana
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68 jon-net@usa.net
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69 Microsoft Sitebuilder Network Level 1 Member - HTML Writer's Guild Member
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70
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71
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72 Here is another example from Michael <michael_borgsys@hotmail.com> that he
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73 says conforms to the VB guidelines, and that solves the problem of not
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74 knowing the uncompressed size by storing it at the end of the file:
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75
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76 'Calling the functions:
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77 'bracket meaning: <parameter> [optional] {Range of possible values}
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78 'Call subCompressFile(<path with filename to compress> [, <path with
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79 filename to write to>, [level of compression {1..9}]])
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80 'Call subUncompressFile(<path with filename to compress>)
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81
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82 Option Explicit
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83 Private lngpvtPcnSml As Long 'Stores value for 'lngPercentSmaller'
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84 Private Const SUCCESS As Long = 0
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85 Private Const strFilExt As String = ".cpr"
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86 Private Declare Function lngfncCpr Lib "zlib.dll" Alias "compress2" (ByRef
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87 dest As Any, ByRef destLen As Any, ByRef src As Any, ByVal srcLen As Long,
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88 ByVal level As Integer) As Long
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89 Private Declare Function lngfncUcp Lib "zlib.dll" Alias "uncompress" (ByRef
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90 dest As Any, ByRef destLen As Any, ByRef src As Any, ByVal srcLen As Long)
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91 As Long
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92
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93 Public Sub subCompressFile(ByVal strargOriFilPth As String, Optional ByVal
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94 strargCprFilPth As String, Optional ByVal intLvl As Integer = 9)
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95 Dim strCprPth As String
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96 Dim lngOriSiz As Long
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97 Dim lngCprSiz As Long
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
98 Dim bytaryOri() As Byte
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
99 Dim bytaryCpr() As Byte
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
100 lngOriSiz = FileLen(strargOriFilPth)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
101 ReDim bytaryOri(lngOriSiz - 1)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
102 Open strargOriFilPth For Binary Access Read As #1
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
103 Get #1, , bytaryOri()
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
104 Close #1
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
105 strCprPth = IIf(strargCprFilPth = "", strargOriFilPth, strargCprFilPth)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
106 'Select file path and name
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
107 strCprPth = strCprPth & IIf(Right(strCprPth, Len(strFilExt)) =
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
108 strFilExt, "", strFilExt) 'Add file extension if not exists
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
109 lngCprSiz = (lngOriSiz * 1.01) + 12 'Compression needs temporary a bit
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
110 more space then original file size
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
111 ReDim bytaryCpr(lngCprSiz - 1)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
112 If lngfncCpr(bytaryCpr(0), lngCprSiz, bytaryOri(0), lngOriSiz, intLvl) =
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
113 SUCCESS Then
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
114 lngpvtPcnSml = (1# - (lngCprSiz / lngOriSiz)) * 100
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
115 ReDim Preserve bytaryCpr(lngCprSiz - 1)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
116 Open strCprPth For Binary Access Write As #1
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
117 Put #1, , bytaryCpr()
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
118 Put #1, , lngOriSiz 'Add the original size value to the end
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
119 (last 4 bytes)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
120 Close #1
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
121 Else
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
122 MsgBox "Compression error"
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
123 End If
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
124 Erase bytaryCpr
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
125 Erase bytaryOri
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
126 End Sub
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
127
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
128 Public Sub subUncompressFile(ByVal strargFilPth As String)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
129 Dim bytaryCpr() As Byte
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
130 Dim bytaryOri() As Byte
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
131 Dim lngOriSiz As Long
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
132 Dim lngCprSiz As Long
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
133 Dim strOriPth As String
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
134 lngCprSiz = FileLen(strargFilPth)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
135 ReDim bytaryCpr(lngCprSiz - 1)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
136 Open strargFilPth For Binary Access Read As #1
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
137 Get #1, , bytaryCpr()
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
138 Close #1
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
139 'Read the original file size value:
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
140 lngOriSiz = bytaryCpr(lngCprSiz - 1) * (2 ^ 24) _
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
141 + bytaryCpr(lngCprSiz - 2) * (2 ^ 16) _
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
142 + bytaryCpr(lngCprSiz - 3) * (2 ^ 8) _
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
143 + bytaryCpr(lngCprSiz - 4)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
144 ReDim Preserve bytaryCpr(lngCprSiz - 5) 'Cut of the original size value
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
145 ReDim bytaryOri(lngOriSiz - 1)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
146 If lngfncUcp(bytaryOri(0), lngOriSiz, bytaryCpr(0), lngCprSiz) = SUCCESS
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
147 Then
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
148 strOriPth = Left(strargFilPth, Len(strargFilPth) - Len(strFilExt))
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
149 Open strOriPth For Binary Access Write As #1
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
150 Put #1, , bytaryOri()
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
151 Close #1
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
152 Else
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
153 MsgBox "Uncompression error"
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
154 End If
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
155 Erase bytaryCpr
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
156 Erase bytaryOri
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
157 End Sub
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
158 Public Property Get lngPercentSmaller() As Long
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
159 lngPercentSmaller = lngpvtPcnSml
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
160 End Property