[llvm-commits] CVS: llvm/lib/Support/FileUtilities.cpp

[Brian Gaeke]

Changes in directory llvm/lib/Support:

FileUtilities.cpp updated: 1.9 -> 1.10

---
Log message:

Move IsArchive and IsBytecode here from gccld. Refactor into CheckMagic.

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Diffs of the changes:  (+29 -0)

Index: llvm/lib/Support/FileUtilities.cpp
diff -u llvm/lib/Support/FileUtilities.cpp:1.9 llvm/lib/Support/FileUtilities.cpp:1.10
--- llvm/lib/Support/FileUtilities.cpp:1.9	Tue Nov 11 12:27:21 2003
+++ llvm/lib/Support/FileUtilities.cpp	Tue Nov 11 15:53:50 2003
@@ -20,6 +20,35 @@
 #include <iostream>
 #include <cstdio>
 
+/// CheckMagic - Returns true IFF the file named FN begins with Magic. FN must
+/// name a readable file.
+///
+bool CheckMagic (const std::string &FN, const std::string &Magic) {
+  char buf[1 + Magic.size ()];
+  std::ifstream f (FN.c_str ());
+  f.read (buf, Magic.size ());
+  buf[Magic.size ()] = '\0';
+  return Magic == buf;
+}
+
+/// IsArchive - Returns true IFF the file named FN appears to be a "ar" library
+/// archive. The file named FN must exist.
+///
+bool IsArchive(const std::string &FN) {
+  // Inspect the beginning of the file to see if it contains the "ar"
+  // library archive format magic string.
+  return CheckMagic (FN, "!<arch>\012");
+}
+
+/// IsBytecode - Returns true IFF the file named FN appears to be an LLVM
+/// bytecode file. The file named FN must exist.
+///
+bool IsBytecode(const std::string &FN) {
+  // Inspect the beginning of the file to see if it contains the LLVM
+  // bytecode format magic string.
+  return CheckMagic (FN, "llvm");
+}
+
 /// FileOpenable - Returns true IFF Filename names an existing regular
 /// file which we can successfully open.
 ///