Where does Skype save my contact's avatars in Linux?

I'm using Skype on Linux.

Where can I find images cached by skype of my contact's avatars?

Answer

I wanted to get those Skype avatars too so I used whitequark's answer to make a little bash script which does just that. Here it is:

#!/bin/bash

if [ \( $# -lt 1 \) ];
then
  echo "Usage: $0 folder";
  echo "Where folder is of the form /home/username/.Skype/username";
  exit;
fi;

for i in `ls $1`;
do
  if [ -f $1/$i ];
  then
    #echo "i: $i";
    filedump=`hexdump -v -e '"" 1/1 "%02x" ""' $1/$i | sed -e 's/ffd8ffe0/\nffd8ffe0/g'`;
    nocc=`echo "$filedump" | wc -l`; # occurences of the \n char. Means that there are nocc-1 occurences of our word
    #echo "nocc: $nocc";
    if [ "$nocc" -ge 2 ];
    then
      k=0;
      old_IFS=$IFS; #field separator
      IFS=$'\n';
      offset=0;
      for j in $filedump;
      do
        w=`echo $j | wc -m`; # gives actually lettercount+1
        w=$[w-1];
        offset=$[offset+w];
        #echo "offset: $offset";
        filename1="${i}_${k}_notclean.jpg";
        filename2="${i}_${k}.jpg";
        dd ibs=1 if=$1/$i of=$filename1 skip=`echo "$offset/2" | bc` status=noxfer;
        if [ `du $filename1 | cut -f1` -gt 0 ];
        then
          convert $filename1 $filename2; #convert is actually only used to remove the data after the image
        fi;
        rm $filename1;
        k=$[k+1];
      done;
      IFS=$old_IFS;
    fi;
  fi;
done