Minor improvements to UNOIDL binary format

Change-Id: Ia215b34842ce85bfbd1ad90a286abcbae0884bd5

config_host/config_version.h.in

@@ -16,10 +16,10 @@ Version settings
 #undef LIBO_THIS_YEAR
 
 #define LIBO_VERSION_DOTTED \
-    (LIBO_VERSION_STRINGIFY(LIBO_VERSION_MAJOR) "." \
-     LIBO_VERSION_STRINGIFY(LIBO_VERSION_MINOR) "." \
-     LIBO_VERSION_STRINGIFY(LIBO_VERSION_MICRO) "." \
-     LIBO_VERSION_STRINGIFY(LIBO_VERSION_PATCH))
+    LIBO_VERSION_STRINGIFY(LIBO_VERSION_MAJOR) "." \
+    LIBO_VERSION_STRINGIFY(LIBO_VERSION_MINOR) "." \
+    LIBO_VERSION_STRINGIFY(LIBO_VERSION_MICRO) "." \
+    LIBO_VERSION_STRINGIFY(LIBO_VERSION_PATCH)
 
 #define LIBO_VERSION_ENCODED_IN_32BITS \
     ((LIBO_VERSION_MAJOR << 24) | (LIBO_VERSION_MINOR << 16) | (LIBO_VERSION_MICRO << 8) | LIBO_VERSION_PATCH)

unoidl/README

@@ -45,11 +45,18 @@ The file starts with an 8 byte header, followed by information about the root
 map (reg2unoidl generates files in a single depth-first pass, so the root map
 itself is at the end of the file):
 
-* 8 byte header "UNOIDL\0\xFF"
+* 7 byte magic header "UNOIDL\xFF"
+* version byte 0
 * Offset of root Map
 * UInt32 number of entries of root Map
 ...
 
+Files generated by reg2unoidl follow that by a
+
+  "\0** Created by LibreOffice " LIBO_VERSION_DOTTED " reg2unoidl **\0"
+
+banner (cf. config_host/config_version.h.in), as a debugging aid.
+
 Layout of per-entry payload in the root or a module Map:
 
 * kind byte:

unoidl/source/reg2unoidl.cxx

@@ -17,11 +17,13 @@
 #include <utility>
 #include <vector>
 
+#include "config_version.h"
 #include "osl/endian.h"
 #include "osl/file.h"
 #include "osl/file.hxx"
 #include "osl/process.h"
 #include "rtl/process.h"
+#include "rtl/string.h"
 #include "rtl/string.hxx"
 #include "rtl/textenc.h"
 #include "rtl/textcvt.h"
@@ -746,9 +748,14 @@ SAL_IMPLEMENT_MAIN() {
             << +e << std::endl;
         std::exit(EXIT_FAILURE);
     }
-    write(f, "UNOIDL\0\xFF", 8);
+    write(f, "UNOIDL\xFF\0", 8);
     write32(f, 0); // root map offset
     write32(f, 0); // root map size
+    write(
+        f,
+        RTL_CONSTASCII_STRINGPARAM(
+            "\0** Created by LibreOffice " LIBO_VERSION_DOTTED
+            " reg2unoidl **\0"));
     sal_uInt64 off;
     std::size_t size;
     try {

unoidl/source/unoidlprovider.cxx

@@ -1058,11 +1058,12 @@ rtl::Reference< Entity > readEntity(
 UnoidlProvider::UnoidlProvider(OUString const & uri):
     file_(new detail::MappedFile(uri))
 {
-    if (file_->size < 8 || std::memcmp(file_->address, "UNOIDL\0\xFF", 8) != 0)
+    if (file_->size < 8 || std::memcmp(file_->address, "UNOIDL\xFF\0", 8) != 0)
     {
         throw FileFormatException(
             file_->uri,
-            "UNOIDL format: does not begin with magic UNOIDL\\0\\xFF");
+            "UNOIDL format: does not begin with magic UNOIDL\\xFF and version"
+            " 0");
     }
     sal_uInt32 off = file_->read32(8);
     mapSize_ = file_->read32(12);