[gnurl] 214/411: runtests: allow generating a binary sequence from hex

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nikita pushed a commit to branch master
in repository gnurl.

commit 2dd53e82f1ec3de8a9ecc1261ca4d9077506a9bb
Author: Daniel Stenberg <daniel@haxx.se>
AuthorDate: Fri Oct 2 00:11:13 2020 +0200

    runtests: allow generating a binary sequence from hex
---
 tests/FILEFORMAT.md | 13 +++++++++++++
 tests/runtests.pl   |  7 +++++++
 2 files changed, 20 insertions(+)

diff --git a/tests/FILEFORMAT.md b/tests/FILEFORMAT.md
index 09600d016..7748b6706 100644
--- a/tests/FILEFORMAT.md
+++ b/tests/FILEFORMAT.md
@@ -40,6 +40,19 @@ server's port number (in ASCII) followed by a space and the 
hexadecimal byte
 
     %b64[%HTTPPORT %9a]b64%
 
+## Hexadecimal decoding
+
+In the preprocess stage, a special instruction can be used to have runtests.pl
+generate a sequence of binary bytes.
+
+To insert a sequence of bytes from a hex encoded string, use this syntax:
+
+    %hex[ %XX-encoded data to decode ]hex%
+
+For example, to insert the binary octets 0, 1 and 255 into the test file:
+
+    %hex[ %00%01%FF ]hex%
+
 # Variables
 
 When the test is preprocessed, a range of "variables" in the test file will be
diff --git a/tests/runtests.pl b/tests/runtests.pl
index 49b318dc7..325522182 100755
--- a/tests/runtests.pl
+++ b/tests/runtests.pl
@@ -3304,6 +3304,13 @@ sub subBase64 {
         # put the result into there
         $$thing =~ s/%%B64%%/$enc/;
     }
+    # hex decode
+    if($$thing =~ s/%hex\[(.*)\]hex%/%%HEX%%/i) {
+        # decode %NN characters
+        my $d = $1;
+        $d =~ s/%([0-9A-Fa-f]{2})/chr(hex($1))/eg;
+        $$thing =~ s/%%HEX%%/$d/;
+    }
 }
 
 sub fixarray {

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