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md5 checksum of a img file, or get the value of 100th byte
From: |
Xah |
Subject: |
md5 checksum of a img file, or get the value of 100th byte |
Date: |
Thu, 5 Jun 2008 04:29:59 -0700 (PDT) |
User-agent: |
G2/1.0 |
I have few thousand image files, and i need to compute a unique id for
each... something like md5 checksum.
I noticed that elisp has a md5 function that does that, but it takes a
buffer as argument. Does this mean that i have to create a buffer
first by opening the image file? Would this be very inefficient? since
all i need is to build a hash table of the image files, with checksum
as id and file path(s) as value.
or, is there some other way? Perhaps, i can use the image file size
together with a list of byte values at several file stream locations,
as the unique id... this should be sufficient for my purposes but how
do i get the value of, say, the 1000th byte?
Thanks in advance.
Xah
xah@xahlee.org
∑ http://xahlee.org/
☄
- md5 checksum of a img file, or get the value of 100th byte,
Xah <=
- Re: md5 checksum of a img file, or get the value of 100th byte, Eli Zaretskii, 2008/06/05
- Message not available
- Re: md5 checksum of a img file, or get the value of 100th byte, Ted Zlatanov, 2008/06/06
- Re: md5 checksum of a img file, or get the value of 100th byte, Eli Zaretskii, 2008/06/06
- Message not available
- Re: md5 checksum of a img file, or get the value of 100th byte, Ted Zlatanov, 2008/06/06
- Re: md5 checksum of a img file, or get the value of 100th byte, Eli Zaretskii, 2008/06/06
- Message not available
- Re: md5 checksum of a img file, or get the value of 100th byte, Ted Zlatanov, 2008/06/06
- Re: md5 checksum of a img file, or get the value of 100th byte, Eli Zaretskii, 2008/06/07
- Message not available
- Re: md5 checksum of a img file, or get the value of 100th byte, Ted Zlatanov, 2008/06/09
- Re: md5 checksum of a img file, or get the value of 100th byte, Eli Zaretskii, 2008/06/09
- Message not available
- Re: md5 checksum of a img file, or get the value of 100th byte, Tim X, 2008/06/06