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https://issues.apache.org/jira/browse/COMPRESS-176?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13216652#comment-13216652
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Stefan Bodewig commented on COMPRESS-176:
-----------------------------------------
In extract.c of unzip60 line 1310ff there is this code that replaces
backslashes with slashes. It only replaces them in names that don't contain
forward slashes (MBSCHR looks up a character in a character array) and only if
"hostnum" indicates a FAT system.
{noformat}
/* for files from DOS FAT, check for use of backslash instead
* of slash as directory separator (bug in some zipper(s); so
* far, not a problem in HPFS, NTFS or VFAT systems)
*/
#ifndef SFX
if (G.pInfo->hostnum == FS_FAT_ && !MBSCHR(G.filename, '/')) {
char *p=G.filename;
if (*p) do {
if (*p == '\\') {
if (!G.reported_backslash) {
Info(slide, 0x21, ((char *)slide,
LoadFarString(BackslashPathSep), G.zipfn));
G.reported_backslash = TRUE;
if (!error_in_archive)
error_in_archive = PK_WARN;
}
*p = '/';
}
} while (*PREINCSTR(p));
}
#endif /* !SFX */
{noformat}
"hostnum" is the upper byte of "version made by" inside the central directory
header - this is ZipArchiveEntry's get/setPlatform - and FS_FAT_ is 0
(ZipArchiveEntry#PLATFORM_FAT). We'd have all pieces together to emulate this.
> ArchiveInputStream#getNextEntry(): Problems with WinZip directories with
> Umlauts
> --------------------------------------------------------------------------------
>
> Key: COMPRESS-176
> URL: https://issues.apache.org/jira/browse/COMPRESS-176
> Project: Commons Compress
> Issue Type: Bug
> Components: Archivers
> Affects Versions: 1.3
> Environment: Windows 7
> Reporter: Wurstbrot mit Senf
> Attachments: test-7zip.zip, test-windows.zip, test-winzip.zip,
> testzap-winzip.zip
>
>
> There is a problem when handling a WinZip-created zip with Umlauts in
> directories.
> I'm accessing a zip file created with WinZip containing a directory with an
> umlaut ("รค") with ArchiveInputStream. When creating the zip file the
> unicode-flag of winzip had been active.
> The following problem occurs when accessing the entries of the zip:
> the ArchiveEntry for a directory containing an umlaut is not marked as a
> directory and the file names for the directory and all files contained in
> that directory contain backslashes instead of slashes (i.e. completely
> different to all other files in directories with no umlaut in their path).
> There is no difference when letting the ArchiveStreamFactory decide which
> ArchiveInputStream to create or when using the ZipArchiveInputStream
> constructor with the correct encoding (I've tried different encodings CP437,
> CP850, ISO-8859-15, but still the problem persisted).
> This problem does not occur when using the very same zip file but compressed
> by 7zip or the built-in Windows 7 zip functionality.
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