Move internal zip code from zip.cc to zip_internal.cc

third_party/zlib/google/zip_internal.h

Index: third_party/zlib/google/zip_internal.h
diff --git a/third_party/zlib/google/zip_internal.h b/third_party/zlib/google/zip_internal.h
index 57894bebd6459390504e49a05cda92788d9301ba..ffd4039316d0b2a692f3804dde1caff8195ba7e8 100644
--- a/third_party/zlib/google/zip_internal.h
+++ b/third_party/zlib/google/zip_internal.h
@@ -19,6 +19,10 @@
 #include "third_party/zlib/contrib/minizip/zip.h"
 #endif
 
+namespace base {
+class FilePath;
+}
+
 // Utility functions and constants used internally for the zip file
 // library in the directory. Don't use them outside of the library.
 namespace zip {
@@ -41,7 +45,7 @@ unzFile OpenHandleForUnzipping(HANDLE zip_handle);
 // Creates a custom unzFile object which reads data from the specified string.
 // This custom unzFile object overrides the I/O API functions of zlib so it can
 // read data from the specified string.
-unzFile PreprareMemoryForUnzipping(const std::string& data);
+unzFile PrepareMemoryForUnzipping(const std::string& data);
 
 // Opens the given file name in UTF-8 for zipping, with some setup for
 // Windows. |append_flag| will be passed to zipOpen2().
@@ -53,6 +57,14 @@ zipFile OpenForZipping(const std::string& file_name_utf8, int append_flag);
 zipFile OpenFdForZipping(int zip_fd, int append_flag);
 #endif
 
+// Returns a zip_fileinfo with the last modification date of |path| set.
+zip_fileinfo GetFileInfoForZipping(const base::FilePath& path);
+
+// Wrapper around zipOpenNewFileInZip4 which passes most common options.
+bool ZipOpenNewFileInZip(zipFile zip_file,
+                         const std::string& str_path,
+                         const zip_fileinfo* file_info);
+
 const int kZipMaxPath = 256;
 const int kZipBufSize = 8192;