Add an API to unpack Zip files directly from and to file descriptors.

chrome/common/zip_reader.h

Index: chrome/common/zip_reader.h
diff --git a/chrome/common/zip_reader.h b/chrome/common/zip_reader.h
index f77616ba9f96c7d4d74313b351dab1946b9b78f9..2fe90dcbfeb277a86fb3293bdb3eea8549c960c6 100644
--- a/chrome/common/zip_reader.h
+++ b/chrome/common/zip_reader.h
@@ -10,6 +10,7 @@
 
 #include "base/basictypes.h"
 #include "base/file_path.h"
+#include "base/file_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time.h"
 #include "third_party/zlib/contrib/minizip/unzip.h"
@@ -77,6 +78,12 @@ class ZipReader {
   // success.
   bool Open(const FilePath& zip_file_path);
 
+#if defined(OS_POSIX)
+  // Opens the zip file referred to by the file descriptor |zip_fd|.
+  // Returns true on success.
+  bool OpenFd(const int zip_fd);

[satorux1, 2011/12/12 04:54:14]

We often use "FromSomething" for naming functions like this, so OpenFromFd() may
sound a bit nicer in our code base.

const int -> int.

[Jorge Lucangeli Obes, 2011/12/12 23:34:35]

Done.

+#endif
+
   // Closes the currently opened zip file. This function is called in the
   // destructor of the class, so you usually don't need to call this.
   void Close();
@@ -125,6 +132,12 @@ class ZipReader {
   // beforehand.
   bool ExtractCurrentEntryIntoDirectory(const FilePath& output_directory_path);
 
+#if defined(OS_POSIX)
+  // Extracts the current entry by writing directly to a file descriptor.
+  // Does not close the file descriptor. Returns true on success.
+  bool ExtractCurrentEntryToFd(const int fd);
+#endif
+
   // Returns the current entry info. Returns NULL if the current entry is
   // not yet opened. OpenCurrentEntryInZip() must be called beforehand.
   EntryInfo* current_entry_info() const {
@@ -136,9 +149,15 @@ class ZipReader {
   int num_entries() const { return num_entries_; }
 
  private:
+  // Initializes internal state.
+  bool Initialize();
+
   // Resets the internal state.
   void Reset();
 
+  // Helper for ExtractCurrentEntryTo(FilePath|Fd)
+  bool ExtractCurrentEntryToBuffer(const char* buf, const int size);
+
   unzFile zip_file_;
   int num_entries_;
   bool reached_end_;