Dear Fox,
There is absolutely no reason why the Tcl-builtin zlib function
returns different sizes in tclsh or NaviServer. I could not
reproduce any differences in these two environments.
(i modified you script slightly, and made sure, that the
resulting compressed files is (a) binary and (b) does
not contain a newline at the end of the file).
all are the same for
=====================================
set inFile "/tmp/myImage.png"
set outFile "/tmp/myImage.png.ixz"
set myFile [open $inFile RDONLY]
fconfigure $myFile -translation binary
set content [read $myFile]
close $myFile
set binData [encoding convertto utf-8 $content]
set hexData [binary encode hex [encoding convertto utf-8 $content]]
# level 0 => 2.56 MB
# level 6 => 1.13 MB
# level not specified 1.13 MB
# level 9 => 1.11 MB
set fp [open $outFile w]
fconfigure $fp -translation binary
puts -nonewline $fp [zlib compress $hexData]
close $fp
puts [subst {
/tmp/myImage.png: [clock format [file mtime /tmp/myImage.png]] [file
size /tmp/myImage.png]
/tmp/myImage.png.ixz [clock format [file mtime /tmp/myImage.png.ixz]] [file
size /tmp/myImage.png.ixz]
}]
=====================================
On 10.05.20 15:59, D.Fox wrote:
Hi, I am trying to compress a image (.png) using hexadecimal and ZLIB.
When running the below code within naviserver the created file is
larger then if I run standalone shell.
The sample code is as follows:
#########
set file "/bench/myImage.png"
set filePath "/bench/"
set myFile [open $file RDONLY]
fconfigure $ myFile -translation binary
set content [read $myFile]
set binData [encoding convertto utf-8 $content]
set hexData [binary encode hex [encoding convertto utf-8 $content]]
close $myFile
set fp [open "$filePath/myCompressedHexBlobFile.ixz" w]
puts $fp [zlib compress $hexData]
close $fp
#########
Outputs:
846K - myImage.png
1.7M - myCompressedHexBlobFile.ixz - Executed within Naviserver
1.1M - myCompressedHexBlobFile.ixz - Executed from shell with TCLSH
#########
Is Navi using a different zlib compression level, why is this happening?
If I set the compression level to nine, the created file is still at
1.7mb. This is kind of a game changer, even if I source the
compression script the file size is still larger then if I run it via
terminal.
Thanks
Fox
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