Implement IdentifyFileType function
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17776 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/System/Path.cpp b/lib/System/Path.cpp
index ace8505..d582759 100644
--- a/lib/System/Path.cpp
+++ b/lib/System/Path.cpp
@@ -21,6 +21,33 @@
//=== independent code.
//===----------------------------------------------------------------------===//
+LLVMFileType
+IdentifyFileType(const char*magic, unsigned length) {
+ assert(magic && "Invalid magic number string");
+ assert(length >=4 && "Invalid magic number length");
+ switch (magic[0]) {
+ case 'l':
+ if (magic[1] == 'l' && magic[2] == 'v') {
+ if (magic[3] == 'c')
+ return CompressedBytecodeFileType;
+ else if (magic[3] == 'm')
+ return BytecodeFileType;
+ }
+ break;
+
+ case '!':
+ if (length >= 8) {
+ if (memcmp(magic,"!<arch>\n",8) == 0)
+ return ArchiveFileType;
+ }
+ break;
+
+ default:
+ break;
+ }
+ return UnknownFileType;
+}
+
}
// Include the truly platform-specific parts of this class.