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saip-tool: add option to extact profile elements to file

In some cases it may be helpful to extract a single profile element
from the sequence to a dedicated file.

Change-Id: I77a80bfaf8970660a84fa61f7e08f404ffc4c2da
---
M contrib/saip-tool.py
1 file changed, 14 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/pysim refs/changes/61/39861/1

diff --git a/contrib/saip-tool.py b/contrib/saip-tool.py
index 134357a..05b828b 100755
--- a/contrib/saip-tool.py
+++ b/contrib/saip-tool.py
@@ -47,6 +47,10 @@
 
 parser_check = subparsers.add_parser('check', help='Run constraint checkers on PE-Sequence')
 
+parser_rpe = subparsers.add_parser('extract-pe', help='Extract specified PE to (DER encoded) file')
+parser_rpe.add_argument('--pe-file', required=True, help='PE file name')
+parser_rpe.add_argument('--identification', type=int, help='Extract PE matching specified identification')
+
 parser_rpe = subparsers.add_parser('remove-pe', help='Remove specified PEs from PE-Sequence')
 parser_rpe.add_argument('--output-file', required=True, help='Output file name')
 parser_rpe.add_argument('--identification', type=int, action='append', help='Remove PEs matching specified identification')
@@ -160,6 +164,14 @@
     checker.check(pes)
     print("All good!")
 
+def do_extract_pe(pes: ProfileElementSequence, opts):
+    new_pe_list = []
+    for pe in pes.pe_list:
+        if pe.identification == opts.identification:
+            print("Extracting PE %s (id=%u) to file %s..." % (pe, pe.identification, opts.pe_file))
+            with open(opts.pe_file, 'wb') as f:
+                f.write(pe.to_der())
+
 def do_remove_pe(pes: ProfileElementSequence, opts):
     new_pe_list = []
     for pe in pes.pe_list:
@@ -457,6 +469,8 @@
         do_dump(pes, opts)
     elif opts.command == 'check':
         do_check(pes, opts)
+    elif opts.command == 'extract-pe':
+        do_extract_pe(pes, opts)
     elif opts.command == 'remove-pe':
         do_remove_pe(pes, opts)
     elif opts.command == 'remove-naa':

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