Add HTTPBodyStream interface, three concrete implementations, and their tests.

util/net/http_body.cc

+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "util/net/http_body.h"
+
+#include <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <algorithm>
+#include <limits>
+
+#include "base/logging.h"
+#include "base/posix/eintr_wrapper.h"
+#include "base/stl_util.h"
+#include "util/file/fd_io.h"
+
+namespace crashpad {
+
+StringHTTPBodyStream::StringHTTPBodyStream(const std::string& string)
+    : HTTPBodyStream(), string_(string), bytes_read_() {
+}
+
+StringHTTPBodyStream::~StringHTTPBodyStream() {
+}
+
+ssize_t StringHTTPBodyStream::GetBytesBuffer(uint8_t* buffer, size_t max_len) {
+  size_t num_bytes_remaining = string_.length() - bytes_read_;
+  if (num_bytes_remaining == 0) {
+    return num_bytes_remaining;
+  }
+
+  size_t num_bytes_returned =
+      std::min(std::min(num_bytes_remaining, max_len),
+               static_cast<size_t>(std::numeric_limits<ssize_t>::max()));
+  memcpy(buffer, &string_[bytes_read_], num_bytes_returned);
+  bytes_read_ += num_bytes_returned;
+  return num_bytes_returned;
+}
+
+FileHTTPBodyStream::FileHTTPBodyStream(const base::FilePath& path)
+    : HTTPBodyStream(), path_(path), fd_(kUnopenedFile) {
+}
+
+FileHTTPBodyStream::~FileHTTPBodyStream() {
+  if (fd_ > kUnopenedFile) {

[Mark Mentovai, 2014/10/24 17:46:58]

This is sensitive to the ordering of the enum. I’d either make this |>= 0|
(which adheres to the documentation you’ve written for the fd_ member) or add an
enum member like kMinimumValidFD to be used here.

[Robert Sesek, 2014/10/24 18:45:31]

Done.

+    CloseFD(fd_);
+  }
+}
+
+ssize_t FileHTTPBodyStream::GetBytesBuffer(uint8_t* buffer, size_t max_len) {
+  if (fd_ == kUnopenedFile) {

[Mark Mentovai, 2014/10/24 17:46:58]

switch?

[Robert Sesek, 2014/10/24 18:45:31]

Done.

+    fd_ = HANDLE_EINTR(open(path_.value().c_str(), O_RDONLY));
+    if (fd_ < 0) {
+      fd_ = kFileOpenError;
+      PLOG(ERROR) << "Cannot open " << path_.value();
+      return -1;
+    }
+  } else if (fd_ == kFileOpenError) {
+    return -2;
+  } else if (fd_ == kClosedAtEOF) {
+    return 0;
+  }
+
+  ssize_t rv = ReadFD(fd_, buffer, max_len);
+  if (rv == 0) {
+    CloseFD(fd_);
+    fd_ = kClosedAtEOF;
+  } else if (rv < 0) {
+    PLOG(ERROR) << "read";
+  }
+  return rv;
+}
+
+CompositeHTTPBodyStream::CompositeHTTPBodyStream(
+    const CompositeHTTPBodyStream::PartsList& parts)
+    : HTTPBodyStream(), parts_(parts), current_part_(parts_.begin()) {
+}
+
+CompositeHTTPBodyStream::~CompositeHTTPBodyStream() {
+  STLDeleteContainerPointers(parts_.begin(), parts_.end());
+}
+
+ssize_t CompositeHTTPBodyStream::GetBytesBuffer(uint8_t* buffer,
+                                                size_t max_len) {
+  if (current_part_ == parts_.end())
+    return 0;
+
+  ssize_t rv = (*current_part_)->GetBytesBuffer(buffer, max_len);
+
+  if (rv == 0) {
+    // If the current part has returned 0 indicating EOF, advance the current
+    // part and call recursively to try again.
+    ++current_part_;
+    return GetBytesBuffer(buffer, max_len);
+  }
+
+  return rv;
+}
+
+}  // namespace crashpad