Remove //net (except for Android test stuff) and sdch

net/http/partial_data.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef NET_HTTP_PARTIAL_DATA_H_
-#define NET_HTTP_PARTIAL_DATA_H_
-
-#include "base/basictypes.h"
-#include "net/base/completion_callback.h"
-#include "net/http/http_byte_range.h"
-#include "net/http/http_request_headers.h"
-
-namespace disk_cache {
-class Entry;
-}
-
-namespace net {
-
-class HttpResponseHeaders;
-class IOBuffer;
-
-// This class provides support for dealing with range requests and the
-// subsequent partial-content responses. We use sparse cache entries to store
-// these requests. This class is tightly integrated with HttpCache::Transaction
-// and it is intended to allow a cleaner implementation of that class.
-//
-// In order to fulfill range requests, we may have to perform a sequence of
-// reads from the cache, interleaved with reads from the network / writes to the
-// cache. This class basically keeps track of the data required to perform each
-// of those individual network / cache requests.
-class PartialData {
- public:
-  PartialData();
-  ~PartialData();
-
-  // Performs initialization of the object by examining the request |headers|
-  // and verifying that we can process the requested range. Returns true if
-  // we can process the requested range, and false otherwise.
-  bool Init(const HttpRequestHeaders& headers);
-
-  // Sets the headers that we should use to make byte range requests. This is a
-  // subset of the request extra headers, with byte-range related headers
-  // removed.
-  void SetHeaders(const HttpRequestHeaders& headers);
-
-  // Restores the byte-range headers, by appending the byte range to the headers
-  // provided to SetHeaders().
-  void RestoreHeaders(HttpRequestHeaders* headers) const;
-
-  // Starts the checks to perform a cache validation. Returns 0 when there is no
-  // need to perform more operations because we reached the end of the request
-  // (so 0 bytes should be actually returned to the user), a positive number to
-  // indicate that PrepareCacheValidation should be called, or an appropriate
-  // error code. If this method returns ERR_IO_PENDING, the |callback| will be
-  // notified when the result is ready.
-  int ShouldValidateCache(disk_cache::Entry* entry,
-                          const CompletionCallback& callback);
-
-  // Builds the required |headers| to perform the proper cache validation for
-  // the next range to be fetched.
-  void PrepareCacheValidation(disk_cache::Entry* entry,
-                              HttpRequestHeaders* headers);
-
-  // Returns true if the current range is stored in the cache.
-  bool IsCurrentRangeCached() const;
-
-  // Returns true if the current range is the last one needed to fulfill the
-  // user's request.
-  bool IsLastRange() const;
-
-  // Extracts info from headers already stored in the cache. Returns false if
-  // there is any problem with the headers. |truncated| should be true if we
-  // have an incomplete 200 entry.
-  bool UpdateFromStoredHeaders(const HttpResponseHeaders* headers,
-                               disk_cache::Entry* entry, bool truncated);
-
-  // Sets the byte current range to start again at zero (for a truncated entry).
-  void SetRangeToStartDownload();
-
-  // Returns true if the requested range is valid given the stored data.
-  bool IsRequestedRangeOK();
-
-  // Returns true if the response headers match what we expect, false otherwise.
-  bool ResponseHeadersOK(const HttpResponseHeaders* headers);
-
-  // Fixes the response headers to include the right content length and range.
-  // |success| is the result of the whole request so if it's false, we'll change
-  // the result code to be 416.
-  void FixResponseHeaders(HttpResponseHeaders* headers, bool success);
-
-  // Fixes the content length that we want to store in the cache.
-  void FixContentLength(HttpResponseHeaders* headers);
-
-  // Reads up to |data_len| bytes from the cache and stores them in the provided
-  // buffer (|data|). Basically, this is just a wrapper around the API of the
-  // cache that provides the right arguments for the current range. When the IO
-  // operation completes, OnCacheReadCompleted() must be called with the result
-  // of the operation.
-  int CacheRead(disk_cache::Entry* entry, IOBuffer* data, int data_len,
-                const net::CompletionCallback& callback);
-
-  // Writes |data_len| bytes to cache. This is basically a wrapper around the
-  // API of the cache that provides the right arguments for the current range.
-  int CacheWrite(disk_cache::Entry* entry, IOBuffer* data, int data_len,
-                 const net::CompletionCallback& callback);
-
-  // This method should be called when CacheRead() finishes the read, to update
-  // the internal state about the current range.
-  void OnCacheReadCompleted(int result);
-
-  // This method should be called after receiving data from the network, to
-  // update the internal state about the current range.
-  void OnNetworkReadCompleted(int result);
-
-  bool initial_validation() const { return initial_validation_; }
-
- private:
-  class Core;
-  // Returns the length to use when scanning the cache.
-  int GetNextRangeLen();
-
-  // Completion routine for our callback.
-  void GetAvailableRangeCompleted(int result, int64 start);
-
-  int64 current_range_start_;
-  int64 current_range_end_;
-  int64 cached_start_;
-  int64 resource_size_;
-  int cached_min_len_;
-  HttpByteRange byte_range_;  // The range requested by the user.
-  // The clean set of extra headers (no ranges).
-  HttpRequestHeaders extra_headers_;
-  bool range_present_;  // True if next range entry is already stored.
-  bool final_range_;
-  bool sparse_entry_;
-  bool truncated_;  // We have an incomplete 200 stored.
-  bool initial_validation_;  // Only used for truncated entries.
-  Core* core_;
-  CompletionCallback callback_;
-
-  DISALLOW_COPY_AND_ASSIGN(PartialData);
-};
-
-}  // namespace net
-
-#endif  // NET_HTTP_PARTIAL_DATA_H_