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unzip: give better error message when presented with unsupported

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zip file. Add zip documentation and an example of file we cant
 (yet) unpack.
This commit is contained in:
Denis Vlasenko 2008-07-26 16:50:24 +00:00
parent 8dbea7dbb1
commit c2dcb7cf63
3 changed files with 6 additions and 0 deletions
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6
archival/unzip.c
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@ -99,6 +99,12 @@ static void unzip_create_leading_dirs(const char *fn)
static void unzip_extract(zip_header_t *zip_header, int src_fd, int dst_fd)
{
if (zip_header->formatted.flags & (0x0008|0x0001)) {
/* 0x0001 - encrypted */
/* 0x0008 - streaming. [u]cmpsize can be reliably gotten
* only from Central Directory. See unzip_doc.txt */
bb_error_msg_and_die("zip flags 8 and 1 are not supported");
}
if (zip_header->formatted.method == 0) {
/* Method 0 - stored (not compressed) */
off_t size = zip_header->formatted.ucmpsize;

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archival/unzip_cant_handle.odt Normal file
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archival/unzip_doc.txt.bz2 Normal file
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