net: Move data reading functionalities from UploadElement to UploadElementReader

net/base/upload_data_stream.cc

Index: net/base/upload_data_stream.cc
diff --git a/net/base/upload_data_stream.cc b/net/base/upload_data_stream.cc
index b96680efc3eeaf056276a44b1c2942d4f42f1378..e46f2e62718479c71dadccfd7727e191b35581aa 100644
--- a/net/base/upload_data_stream.cc
+++ b/net/base/upload_data_stream.cc
@@ -4,12 +4,10 @@
 
 #include "net/base/upload_data_stream.h"
 
-#include "base/file_util.h"
 #include "base/logging.h"
-#include "base/threading/thread_restrictions.h"
-#include "net/base/file_stream.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
+#include "net/base/upload_element_reader.h"
 
 namespace net {
 
@@ -27,6 +25,9 @@ UploadDataStream::UploadDataStream(UploadData* upload_data)
       total_size_(0),
       current_position_(0),
       initialized_successfully_(false) {
+  const std::vector<UploadElement>& elements = *upload_data_->elements();
+  for (size_t i = 0; i < elements.size(); ++i)
+    element_readers_.push_back(UploadElementReader::Create(elements[i]));
 }
 
 UploadDataStream::~UploadDataStream() {
@@ -34,57 +35,47 @@ UploadDataStream::~UploadDataStream() {
 
 int UploadDataStream::Init() {
   DCHECK(!initialized_successfully_);
-  std::vector<UploadElement>* elements = upload_data_->elements_mutable();
-  {
-    base::ThreadRestrictions::ScopedAllowIO allow_io;
-    total_size_ = 0;
-    if (!is_chunked()) {
-      for (size_t i = 0; i < elements->size(); ++i)
-        total_size_ += (*elements)[i].GetContentLength();
-    }
-  }
 
-  // If the underlying file has been changed and the expected file
-  // modification time is set, treat it as error. Note that the expected
-  // modification time from WebKit is based on time_t precision. So we
-  // have to convert both to time_t to compare. This check is used for
-  // sliced files.
-  for (size_t i = 0; i < elements->size(); ++i) {
-    const UploadElement& element = (*elements)[i];
-    if (element.type() == UploadElement::TYPE_FILE &&
-        !element.expected_file_modification_time().is_null()) {
-      // Temporarily allow until fix: http://crbug.com/72001.
-      base::ThreadRestrictions::ScopedAllowIO allow_io;
-      base::PlatformFileInfo info;
-      if (file_util::GetFileInfo(element.file_path(), &info) &&
-          element.expected_file_modification_time().ToTimeT() !=
-          info.last_modified.ToTimeT()) {
-        return ERR_UPLOAD_FILE_CHANGED;
-      }
-    }
+  uint64 total_size = 0;
+  for (size_t i = 0; i < element_readers_.size(); ++i) {
+    UploadElementReader* reader = element_readers_[i];
+    const int result = reader->InitSync();
+    if (result != OK)
+      return result;
+    if (!is_chunked())
+      total_size += reader->GetContentLength();
   }
-
-  // Reset the offset, as upload_data_ may already be read (i.e. UploadData
-  // can be reused for a new UploadDataStream).
-  for (size_t i = 0; i < elements->size(); ++i)
-    (*elements)[i].ResetOffset();
+  total_size_ = total_size;
 
   initialized_successfully_ = true;
   return OK;
 }
 
 int UploadDataStream::Read(IOBuffer* buf, int buf_len) {
-  std::vector<UploadElement>& elements =
-      *upload_data_->elements_mutable();
+  DCHECK(initialized_successfully_);
 
-  int bytes_copied = 0;
-  while (bytes_copied < buf_len && element_index_ < elements.size()) {
-    UploadElement& element = elements[element_index_];
+  // Initialize readers for newly appended chunks.
+  if (is_chunked()) {
+    const std::vector<UploadElement>& elements = *upload_data_->elements();
+    DCHECK_LE(element_readers_.size(), elements.size());
 
-    bytes_copied += element.ReadSync(buf->data() + bytes_copied,
-                                     buf_len - bytes_copied);
+    for (size_t i = element_readers_.size(); i < elements.size(); ++i) {
+      const UploadElement& element = elements[i];
+      DCHECK_EQ(UploadElement::TYPE_BYTES, element.type());
+      UploadElementReader* reader = UploadElementReader::Create(element);
 
-    if (element.BytesRemaining() == 0)
+      const int rv = reader->InitSync();
+      DCHECK_EQ(rv, OK);
+      element_readers_.push_back(reader);
+    }
+  }
+
+  int bytes_copied = 0;
+  while (bytes_copied < buf_len && element_index_ < element_readers_.size()) {
+    UploadElementReader* reader = element_readers_[element_index_];
+    bytes_copied += reader->ReadSync(buf->data() + bytes_copied,
+                                     buf_len - bytes_copied);
+    if (reader->BytesRemaining() == 0)
       ++element_index_;
 
     if (is_chunked() && !merge_chunks_)
@@ -99,6 +90,7 @@ int UploadDataStream::Read(IOBuffer* buf, int buf_len) {
 }
 
 bool UploadDataStream::IsEOF() const {
+  DCHECK(initialized_successfully_);
   const std::vector<UploadElement>& elements = *upload_data_->elements();
 
   // Check if all elements are consumed.
@@ -119,9 +111,8 @@ bool UploadDataStream::IsInMemory() const {
   if (is_chunked())
     return false;
 
-  const std::vector<UploadElement>& elements = *upload_data_->elements();
-  for (size_t i = 0; i < elements.size(); ++i) {
-    if (elements[i].type() != UploadElement::TYPE_BYTES)
+  for (size_t i = 0; i < element_readers_.size(); ++i) {
+    if (!element_readers_[i]->IsInMemory())
       return false;
   }
   return true;