component_information: rework to reflect mavlink message changes

src/lib/component_information/generate_crc.py

@@ -0,0 +1,48 @@
+#!/usr/bin/env python
+
+import argparse
+import os
+
+parser = argparse.ArgumentParser(description="""Generate the COMPONENT_INFORMATION checksums (CRC32) header file""")
+parser.add_argument('--output', metavar='checksums.h', help='output file')
+parser.add_argument('files', nargs='+', metavar='input_file.json', help='files to generate CRC from')
+
+args = parser.parse_args()
+filename = args.output
+files = args.files
+
+def create_table():
+    a = []
+    for i in range(256):
+        k = i
+        for j in range(8):
+            if k & 1:
+                k ^= 0x1db710640
+            k >>= 1
+        a.append(k)
+    return a
+
+# MAVLink's CRC32
+def crc_update(buf, crc_table, crc):
+    for k in buf:
+        crc = (crc >> 8) ^ crc_table[(crc & 0xff) ^ k]
+    return crc
+
+crc_table = create_table()
+
+with open(filename, 'w') as outfile:
+    outfile.write("#include <stdint.h>\n")
+    outfile.write("namespace component_information {\n")
+    for filename in files:
+        file_crc = 0
+        for line in open(filename, "rb"):
+            file_crc = crc_update(line, crc_table, file_crc)
+
+        basename = os.path.basename(filename)
+        identifier = basename.split('.')[0]
+        outfile.write("static constexpr uint32_t {:}_crc = {:};\n".format(identifier, file_crc))
+
+
+    outfile.write("}\n")
+
+