Added script to split the test case data files

Script generate-afl-tests.sh will split the test suite data files into
individual test case files, suitable for fuzzing.

tests/scripts/generate-afl-tests.sh

@@ -0,0 +1,68 @@
+#!/bin/sh
+
+# This script splits the data test files containing the test cases into
+# individual files (one test case per file) suitable for use with afl
+# (American Fuzzy Lop). http://lcamtuf.coredump.cx/afl/
+#
+# Usage: generate-afl-tests.sh <test data file path>
+#  <test data file path> - should be the path to one of the test suite files
+#                          such as 'test_suite_mpi.data'
+
+# Abort on errors
+set -e
+
+if [ -z $1 ]
+then
+    echo " [!] No test file specified" >&2
+    echo "Usage: $0 <test data file>" >&2
+    exit 1
+fi
+
+SRC_FILEPATH=$(dirname $1)/$(basename $1)
+TESTSUITE=$(basename $1 .data)
+
+THIS_DIR=$(basename $PWD)
+
+if [ -d ../library -a -d ../include -a -d ../tests -a $THIS_DIR == "tests" ];
+then :;
+else
+    echo " [!] Must be run from mbed TLS tests directory" >&2
+    exit 1
+fi
+
+DEST_TESTCASE_DIR=$TESTSUITE-afl-tests
+DEST_OUTPUT_DIR=$TESTSUITE-afl-out
+
+echo " [+] Creating output directories" >&2
+
+if [ -e $DEST_OUTPUT_DIR/* ];
+then :
+    echo " [!] Test output files already exist." >&2
+    exit 1
+else
+    mkdir -p $DEST_OUTPUT_DIR
+fi
+
+if [ -e $DEST_TESTCASE_DIR/* ];
+then :
+    echo " [!] Test output files already exist." >&2
+else
+    mkdir -p $DEST_TESTCASE_DIR
+fi
+
+echo " [+] Creating test cases" >&2
+cd $DEST_TESTCASE_DIR
+
+split -p '^\s*$' ../$SRC_FILEPATH
+
+for f in *;
+do
+    # Strip out any blank lines (no trim on OS X)
+    sed '/^\s*$/d' $f >testcase_$f
+    rm $f
+done
+
+cd ..
+
+echo " [+] Test cases in $DEST_TESTCASE_DIR" >&2
+