Remove the damage caused by my bad advice.

The old world never coped with > 32-bit file offsets, Mac OS doesn't have an
off64_t, and we should fix bionic to have _FILE_OFFSET_BITS rather than turd
up all calling code.

Change-Id: I0cb8b1f83fc19ce1fcf51257594551cfd1aa968c
diff --git a/src/file.h b/src/file.h
index babcb8b..3353602 100644
--- a/src/file.h
+++ b/src/file.h
@@ -27,11 +27,11 @@
 
   // Get the length of the file. Returns a negative value if the length cannot
   // be determined (e.g. not seekable device).
-  virtual off64_t Length() = 0;
+  virtual off_t Length() = 0;
 
   // Get the current position in the file.
   // Returns a negative value if position cannot be determined.
-  virtual off64_t Position() = 0;
+  virtual off_t Position() = 0;
 
   virtual int Fd() = 0;
 
diff --git a/src/file_linux.cc b/src/file_linux.cc
index 1f4be51..367dbe8 100644
--- a/src/file_linux.cc
+++ b/src/file_linux.cc
@@ -43,21 +43,21 @@
 }
 
 
-off64_t LinuxFile::Position() {
+off_t LinuxFile::Position() {
   DCHECK_GE(fd_, 0);
-  return lseek64(fd_, 0, SEEK_CUR);
+  return lseek(fd_, 0, SEEK_CUR);
 }
 
 
-off64_t LinuxFile::Length() {
+off_t LinuxFile::Length() {
   DCHECK_GE(fd_, 0);
-  off64_t position = lseek64(fd_, 0, SEEK_CUR);
+  off_t position = lseek(fd_, 0, SEEK_CUR);
   if (position < 0) {
     // The file is not capable of seeking. Return an error.
     return -1;
   }
-  off64_t result = lseek64(fd_, 0, SEEK_END);
-  lseek64(fd_, position, SEEK_SET);
+  off_t result = lseek(fd_, 0, SEEK_END);
+  lseek(fd_, position, SEEK_SET);
   return result;
 }
 
diff --git a/src/file_linux.h b/src/file_linux.h
index 51605e2..3d381d5 100644
--- a/src/file_linux.h
+++ b/src/file_linux.h
@@ -19,8 +19,8 @@
   virtual int64_t Read(void* buffer, int64_t num_bytes);
   virtual int64_t Write(const void* buffer, int64_t num_bytes);
 
-  virtual off64_t Length();
-  virtual off64_t Position();
+  virtual off_t Length();
+  virtual off_t Position();
 
   virtual int Fd() {
     return fd_;
diff --git a/src/oat_writer.cc b/src/oat_writer.cc
index 3ab2fb9..ac41e4d 100644
--- a/src/oat_writer.cc
+++ b/src/oat_writer.cc
@@ -321,7 +321,7 @@
 }
 
 #define DCHECK_CODE_OFFSET() \
-  DCHECK_EQ(static_cast<off64_t>(code_offset), lseek64(file->Fd(), 0, SEEK_CUR))
+  DCHECK_EQ(static_cast<off_t>(code_offset), lseek(file->Fd(), 0, SEEK_CUR))
 
 bool OatWriter::Write(File* file) {
   if (!file->WriteFully(oat_header_, sizeof(*oat_header_))) {
@@ -358,7 +358,7 @@
   }
   for (size_t i = 0; i != oat_dex_files_.size(); ++i) {
     uint32_t expected_offset = oat_dex_files_[i]->dex_file_offset_;
-    off64_t actual_offset = lseek64(file->Fd(), expected_offset, SEEK_SET);
+    off_t actual_offset = lseek(file->Fd(), expected_offset, SEEK_SET);
     if (static_cast<uint32_t>(actual_offset) != expected_offset) {
       const DexFile* dex_file = (*dex_files_)[i];
       PLOG(ERROR) << "Failed to seek to dex file section. Actual: " << actual_offset
@@ -388,7 +388,7 @@
 
 size_t OatWriter::WriteCode(File* file) {
   uint32_t code_offset = oat_header_->GetExecutableOffset();
-  off64_t new_offset = lseek64(file->Fd(), executable_offset_padding_length_, SEEK_CUR);
+  off_t new_offset = lseek(file->Fd(), executable_offset_padding_length_, SEEK_CUR);
   if (static_cast<uint32_t>(new_offset) != code_offset) {
     PLOG(ERROR) << "Failed to seek to oat code section. Actual: " << new_offset
                 << " Expected: " << code_offset << " File: " << file->name();
@@ -489,7 +489,7 @@
     uint32_t aligned_code_offset = compiled_method->AlignCode(code_offset);
     uint32_t aligned_code_delta = aligned_code_offset - code_offset;
     if (aligned_code_delta != 0) {
-      off64_t new_offset = lseek64(file->Fd(), aligned_code_delta, SEEK_CUR);
+      off_t new_offset = lseek(file->Fd(), aligned_code_delta, SEEK_CUR);
       if (static_cast<uint32_t>(new_offset) != aligned_code_offset) {
         PLOG(ERROR) << "Failed to seek to align oat code. Actual: " << new_offset
                     << " Expected: " << aligned_code_offset << " File: " << file->name();
@@ -595,7 +595,7 @@
                                                              compiler_->GetInstructionSet());
     uint32_t aligned_code_delta = aligned_code_offset - code_offset;
     if (aligned_code_delta != 0) {
-      off64_t new_offset = lseek64(file->Fd(), aligned_code_delta, SEEK_CUR);
+      off_t new_offset = lseek(file->Fd(), aligned_code_delta, SEEK_CUR);
       if (static_cast<uint32_t>(new_offset) != aligned_code_offset) {
         PLOG(ERROR) << "Failed to seek to align invoke stub code. Actual: " << new_offset
                     << " Expected: " << aligned_code_offset;