md5 patch: package version must be decoded to use it

Whole uri comes encoded (urlencoded). Filename must NOT be decoded because
plain aptitude do not decode it when download and install it. Therefore, we
will have ugly named packages at /var/cache/apt/archives but is the standard
behavior.
But package version must be decoded, otherways package=version calls will
not work.
Notice: package version admit '+', so this character must not be translated.

apt-fast

@@ -210,6 +210,12 @@ _remove_lock()
     rm -f "$LCK_FILE.lock"
 }
 
+# decode url string
+# translates %xx but must not convert '+' in spaces
+urldecode()
+{
+    printf '%b' "${1//%/\\x}"
+}
 
 # Check if mirrors are available. And if so add all mirrors to download list.
 get_mirrors(){
@@ -245,11 +251,18 @@ get_uris(){
   #      package URIs.
   apt-get -y --print-uris "$@" | while read pkg_uri_info
   do
-  # --print-uris format is: 'fileurl' filename filesize checksum_hint:filechecksum
+    ## --print-uris format is:
+    # 'fileurl' filename filesize checksum_hint:filechecksum
     uri=$(echo "$pkg_uri_info" | cut -d' ' -f1 | tr -d "'")
     filename=$(echo "$pkg_uri_info" | cut -d' ' -f2)
     filesize=$(echo "$pkg_uri_info" | cut -d' ' -f3)
     checksum=$(echo "$pkg_uri_info" | cut -d' ' -f4 | cut -d':' -f2)
+    ## whole uri comes encoded (urlencoded). Filename must NOT be decoded because
+    # plain aptitude do not decode it when download and install it. Therefore, we
+    # will have ugly named packages at /var/cache/apt/archives but is the standard
+    # behavior.
+    # But package version must be decoded, otherways package=version calls will
+    # not work.
 
     ## Aria only supports md5 and sha1. If --print-uris return other than
     # MD5, we need to replace it (by now behavior is return strongest).
@@ -262,6 +275,7 @@ get_uris(){
     then
       pkg_name=$(echo "$filename" | cut -d'_' -f1)
       pkg_version=$(echo "$filename" | cut -d'_' -f2)
+      pkg_version=$(urldecode $pkg_version)
       patch_md5=$(apt-cache show $pkg_name=$pkg_version | grep MD5sum | head -n 1)
       checksum=$(echo $patch_md5 | cut -d' ' -f2)
     fi