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-rw-r--r--xfa_test/pdf/document_loader.cc513
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diff --git a/xfa_test/pdf/document_loader.cc b/xfa_test/pdf/document_loader.cc
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--- a/xfa_test/pdf/document_loader.cc
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-// Copyright (c) 2010 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.
-
-#include "pdf/document_loader.h"
-
-#include "base/logging.h"
-#include "base/strings/string_util.h"
-#include "net/http/http_util.h"
-#include "ppapi/c/pp_errors.h"
-#include "ppapi/cpp/url_loader.h"
-#include "ppapi/cpp/url_request_info.h"
-#include "ppapi/cpp/url_response_info.h"
-
-namespace chrome_pdf {
-
-// Document below size will be downloaded in one chunk.
-const uint32 kMinFileSize = 64*1024;
-
-DocumentLoader::DocumentLoader(Client* client)
- : client_(client), partial_document_(false), request_pending_(false),
- current_pos_(0), current_chunk_size_(0), current_chunk_read_(0),
- document_size_(0), header_request_(true), is_multipart_(false) {
- loader_factory_.Initialize(this);
-}
-
-DocumentLoader::~DocumentLoader() {
-}
-
-bool DocumentLoader::Init(const pp::URLLoader& loader,
- const std::string& url,
- const std::string& headers) {
- DCHECK(url_.empty());
- url_ = url;
- loader_ = loader;
-
- std::string response_headers;
- if (!headers.empty()) {
- response_headers = headers;
- } else {
- pp::URLResponseInfo response = loader_.GetResponseInfo();
- pp::Var headers_var = response.GetHeaders();
-
- if (headers_var.is_string()) {
- response_headers = headers_var.AsString();
- }
- }
-
- bool accept_ranges_bytes = false;
- bool content_encoded = false;
- uint32 content_length = 0;
- std::string type;
- std::string disposition;
- if (!response_headers.empty()) {
- net::HttpUtil::HeadersIterator it(response_headers.begin(),
- response_headers.end(), "\n");
- while (it.GetNext()) {
- if (LowerCaseEqualsASCII(it.name(), "content-length")) {
- content_length = atoi(it.values().c_str());
- } else if (LowerCaseEqualsASCII(it.name(), "accept-ranges")) {
- accept_ranges_bytes = LowerCaseEqualsASCII(it.values(), "bytes");
- } else if (LowerCaseEqualsASCII(it.name(), "content-encoding")) {
- content_encoded = true;
- } else if (LowerCaseEqualsASCII(it.name(), "content-type")) {
- type = it.values();
- size_t semi_colon_pos = type.find(';');
- if (semi_colon_pos != std::string::npos) {
- type = type.substr(0, semi_colon_pos);
- }
- TrimWhitespace(type, base::TRIM_ALL, &type);
- } else if (LowerCaseEqualsASCII(it.name(), "content-disposition")) {
- disposition = it.values();
- }
- }
- }
- if (!type.empty() &&
- !EndsWith(type, "/pdf", false) &&
- !EndsWith(type, ".pdf", false) &&
- !EndsWith(type, "/x-pdf", false) &&
- !EndsWith(type, "/*", false) &&
- !EndsWith(type, "/acrobat", false) &&
- !EndsWith(type, "/unknown", false)) {
- return false;
- }
- if (StartsWithASCII(disposition, "attachment", false)) {
- return false;
- }
-
- if (content_length > 0)
- chunk_stream_.Preallocate(content_length);
-
- document_size_ = content_length;
- requests_count_ = 0;
-
- // Enable partial loading only if file size is above the threshold.
- // It will allow avoiding latency for multiple requests.
- if (content_length > kMinFileSize &&
- accept_ranges_bytes &&
- !content_encoded) {
- LoadPartialDocument();
- } else {
- LoadFullDocument();
- }
- return true;
-}
-
-void DocumentLoader::LoadPartialDocument() {
- partial_document_ = true;
- // Force the main request to be cancelled, since if we're a full-frame plugin
- // there could be other references to the loader.
- loader_.Close();
- loader_ = pp::URLLoader();
- // Download file header.
- header_request_ = true;
- RequestData(0, std::min(GetRequestSize(), document_size_));
-}
-
-void DocumentLoader::LoadFullDocument() {
- partial_document_ = false;
- chunk_buffer_.clear();
- ReadMore();
-}
-
-bool DocumentLoader::IsDocumentComplete() const {
- if (document_size_ == 0) // Document size unknown.
- return false;
- return IsDataAvailable(0, document_size_);
-}
-
-uint32 DocumentLoader::GetAvailableData() const {
- if (document_size_ == 0) { // If document size is unknown.
- return current_pos_;
- }
-
- std::vector<std::pair<size_t, size_t> > ranges;
- chunk_stream_.GetMissedRanges(0, document_size_, &ranges);
- uint32 available = document_size_;
- std::vector<std::pair<size_t, size_t> >::iterator it;
- for (it = ranges.begin(); it != ranges.end(); ++it) {
- available -= it->second;
- }
- return available;
-}
-
-void DocumentLoader::ClearPendingRequests() {
- // The first item in the queue is pending (need to keep it in the queue).
- if (pending_requests_.size() > 1) {
- // Remove all elements except the first one.
- pending_requests_.erase(++pending_requests_.begin(),
- pending_requests_.end());
- }
-}
-
-bool DocumentLoader::GetBlock(uint32 position, uint32 size, void* buf) const {
- return chunk_stream_.ReadData(position, size, buf);
-}
-
-bool DocumentLoader::IsDataAvailable(uint32 position, uint32 size) const {
- return chunk_stream_.IsRangeAvailable(position, size);
-}
-
-void DocumentLoader::RequestData(uint32 position, uint32 size) {
- DCHECK(partial_document_);
-
- // We have some artefact request from
- // PDFiumEngine::OnDocumentComplete() -> FPDFAvail_IsPageAvail after
- // document is complete.
- // We need this fix in PDFIum. Adding this as a work around.
- // Bug: http://code.google.com/p/chromium/issues/detail?id=79996
- // Test url:
- // http://www.icann.org/en/correspondence/holtzman-to-jeffrey-02mar11-en.pdf
- if (IsDocumentComplete())
- return;
-
- pending_requests_.push_back(std::pair<size_t, size_t>(position, size));
- DownloadPendingRequests();
-}
-
-void DocumentLoader::DownloadPendingRequests() {
- if (request_pending_ || pending_requests_.empty())
- return;
-
- // Remove already completed requests.
- // By design DownloadPendingRequests() should have at least 1 request in the
- // queue. ReadComplete() will remove the last pending comment from the queue.
- while (pending_requests_.size() > 1) {
- if (IsDataAvailable(pending_requests_.front().first,
- pending_requests_.front().second)) {
- pending_requests_.pop_front();
- } else {
- break;
- }
- }
-
- uint32 pos = pending_requests_.front().first;
- uint32 size = pending_requests_.front().second;
- if (IsDataAvailable(pos, size)) {
- ReadComplete();
- return;
- }
-
- // If current request has been partially downloaded already, split it into
- // a few smaller requests.
- std::vector<std::pair<size_t, size_t> > ranges;
- chunk_stream_.GetMissedRanges(pos, size, &ranges);
- if (ranges.size() > 0) {
- pending_requests_.pop_front();
- pending_requests_.insert(pending_requests_.begin(),
- ranges.begin(), ranges.end());
- pos = pending_requests_.front().first;
- size = pending_requests_.front().second;
- }
-
- uint32 cur_request_size = GetRequestSize();
- // If size is less than default request, try to expand download range for
- // more optimal download.
- if (size < cur_request_size && partial_document_) {
- // First, try to expand block towards the end of the file.
- uint32 new_pos = pos;
- uint32 new_size = cur_request_size;
- if (pos + new_size > document_size_)
- new_size = document_size_ - pos;
-
- std::vector<std::pair<size_t, size_t> > ranges;
- if (chunk_stream_.GetMissedRanges(new_pos, new_size, &ranges)) {
- new_pos = ranges[0].first;
- new_size = ranges[0].second;
- }
-
- // Second, try to expand block towards the beginning of the file.
- if (new_size < cur_request_size) {
- uint32 block_end = new_pos + new_size;
- if (block_end > cur_request_size) {
- new_pos = block_end - cur_request_size;
- } else {
- new_pos = 0;
- }
- new_size = block_end - new_pos;
-
- if (chunk_stream_.GetMissedRanges(new_pos, new_size, &ranges)) {
- new_pos = ranges.back().first;
- new_size = ranges.back().second;
- }
- }
- pos = new_pos;
- size = new_size;
- }
-
- size_t last_byte_before = chunk_stream_.GetLastByteBefore(pos);
- size_t first_byte_after = chunk_stream_.GetFirstByteAfter(pos + size - 1);
- if (pos - last_byte_before < cur_request_size) {
- size = pos + size - last_byte_before;
- pos = last_byte_before;
- }
-
- if ((pos + size < first_byte_after) &&
- (pos + size + cur_request_size >= first_byte_after))
- size = first_byte_after - pos;
-
- request_pending_ = true;
-
- // Start downloading first pending request.
- loader_.Close();
- loader_ = client_->CreateURLLoader();
- pp::CompletionCallback callback =
- loader_factory_.NewCallback(&DocumentLoader::DidOpen);
- pp::URLRequestInfo request = GetRequest(pos, size);
- requests_count_++;
- int rv = loader_.Open(request, callback);
- if (rv != PP_OK_COMPLETIONPENDING)
- callback.Run(rv);
-}
-
-pp::URLRequestInfo DocumentLoader::GetRequest(uint32 position,
- uint32 size) const {
- pp::URLRequestInfo request(client_->GetPluginInstance());
- request.SetURL(url_.c_str());
- request.SetMethod("GET");
- request.SetFollowRedirects(true);
-
- const size_t kBufSize = 100;
- char buf[kBufSize];
- // According to rfc2616, byte range specifies position of the first and last
- // bytes in the requested range inclusively. Therefore we should subtract 1
- // from the position + size, to get index of the last byte that needs to be
- // downloaded.
- base::snprintf(buf, kBufSize, "Range: bytes=%d-%d", position,
- position + size - 1);
- pp::Var header(buf);
- request.SetHeaders(header);
-
- return request;
-}
-
-void DocumentLoader::DidOpen(int32_t result) {
- if (result != PP_OK) {
- NOTREACHED();
- return;
- }
-
- int32_t http_code = loader_.GetResponseInfo().GetStatusCode();
- if (http_code >= 400 && http_code < 500) {
- // Error accessing resource. 4xx error indicate subsequent requests
- // will fail too.
- // E.g. resource has been removed from the server while loading it.
- // https://code.google.com/p/chromium/issues/detail?id=414827
- return;
- }
-
- is_multipart_ = false;
- current_chunk_size_ = 0;
- current_chunk_read_ = 0;
-
- pp::Var headers_var = loader_.GetResponseInfo().GetHeaders();
- std::string headers;
- if (headers_var.is_string())
- headers = headers_var.AsString();
-
- std::string boundary = GetMultiPartBoundary(headers);
- if (boundary.size()) {
- // Leave position untouched for now, when we read the data we'll get it.
- is_multipart_ = true;
- multipart_boundary_ = boundary;
- } else {
- // Need to make sure that the server returned a byte-range, since it's
- // possible for a server to just ignore our bye-range request and just
- // return the entire document even if it supports byte-range requests.
- // i.e. sniff response to
- // http://www.act.org/compass/sample/pdf/geometry.pdf
- current_pos_ = 0;
- uint32 start_pos, end_pos;
- if (GetByteRange(headers, &start_pos, &end_pos)) {
- current_pos_ = start_pos;
- if (end_pos && end_pos > start_pos)
- current_chunk_size_ = end_pos - start_pos + 1;
- }
- }
-
- ReadMore();
-}
-
-bool DocumentLoader::GetByteRange(const std::string& headers, uint32* start,
- uint32* end) {
- net::HttpUtil::HeadersIterator it(headers.begin(), headers.end(), "\n");
- while (it.GetNext()) {
- if (LowerCaseEqualsASCII(it.name(), "content-range")) {
- std::string range = it.values().c_str();
- if (StartsWithASCII(range, "bytes", false)) {
- range = range.substr(strlen("bytes"));
- std::string::size_type pos = range.find('-');
- std::string range_end;
- if (pos != std::string::npos)
- range_end = range.substr(pos + 1);
- TrimWhitespaceASCII(range, base::TRIM_LEADING, &range);
- TrimWhitespaceASCII(range_end, base::TRIM_LEADING, &range_end);
- *start = atoi(range.c_str());
- *end = atoi(range_end.c_str());
- return true;
- }
- }
- }
- return false;
-}
-
-std::string DocumentLoader::GetMultiPartBoundary(const std::string& headers) {
- net::HttpUtil::HeadersIterator it(headers.begin(), headers.end(), "\n");
- while (it.GetNext()) {
- if (LowerCaseEqualsASCII(it.name(), "content-type")) {
- std::string type = base::StringToLowerASCII(it.values());
- if (StartsWithASCII(type, "multipart/", true)) {
- const char* boundary = strstr(type.c_str(), "boundary=");
- if (!boundary) {
- NOTREACHED();
- break;
- }
-
- return std::string(boundary + 9);
- }
- }
- }
- return std::string();
-}
-
-void DocumentLoader::ReadMore() {
- pp::CompletionCallback callback =
- loader_factory_.NewCallback(&DocumentLoader::DidRead);
- int rv = loader_.ReadResponseBody(buffer_, sizeof(buffer_), callback);
- if (rv != PP_OK_COMPLETIONPENDING)
- callback.Run(rv);
-}
-
-void DocumentLoader::DidRead(int32_t result) {
- if (result > 0) {
- char* start = buffer_;
- size_t length = result;
- if (is_multipart_ && result > 2) {
- for (int i = 2; i < result; ++i) {
- if ((buffer_[i - 1] == '\n' && buffer_[i - 2] == '\n') ||
- (i >= 4 &&
- buffer_[i - 1] == '\n' && buffer_[i - 2] == '\r' &&
- buffer_[i - 3] == '\n' && buffer_[i - 4] == '\r')) {
- uint32 start_pos, end_pos;
- if (GetByteRange(std::string(buffer_, i), &start_pos, &end_pos)) {
- current_pos_ = start_pos;
- start += i;
- length -= i;
- if (end_pos && end_pos > start_pos)
- current_chunk_size_ = end_pos - start_pos + 1;
- }
- break;
- }
- }
-
- // Reset this flag so we don't look inside the buffer in future calls of
- // DidRead for this response. Note that this code DOES NOT handle multi-
- // part responses with more than one part (we don't issue them at the
- // moment, so they shouldn't arrive).
- is_multipart_ = false;
- }
-
- if (current_chunk_size_ &&
- current_chunk_read_ + length > current_chunk_size_)
- length = current_chunk_size_ - current_chunk_read_;
-
- if (length) {
- if (document_size_ > 0) {
- chunk_stream_.WriteData(current_pos_, start, length);
- } else {
- // If we did not get content-length in the response, we can't
- // preallocate buffer for the entire document. Resizing array causing
- // memory fragmentation issues on the large files and OOM exceptions.
- // To fix this, we collect all chunks of the file to the list and
- // concatenate them together after request is complete.
- chunk_buffer_.push_back(std::vector<unsigned char>());
- chunk_buffer_.back().resize(length);
- memcpy(&(chunk_buffer_.back()[0]), start, length);
- }
- current_pos_ += length;
- current_chunk_read_ += length;
- client_->OnNewDataAvailable();
- }
- ReadMore();
- } else if (result == PP_OK) {
- ReadComplete();
- } else {
- NOTREACHED();
- }
-}
-
-void DocumentLoader::ReadComplete() {
- if (!partial_document_) {
- if (document_size_ == 0) {
- // For the document with no 'content-length" specified we've collected all
- // the chunks already. Let's allocate final document buffer and copy them
- // over.
- chunk_stream_.Preallocate(current_pos_);
- uint32 pos = 0;
- std::list<std::vector<unsigned char> >::iterator it;
- for (it = chunk_buffer_.begin(); it != chunk_buffer_.end(); ++it) {
- chunk_stream_.WriteData(pos, &((*it)[0]), it->size());
- pos += it->size();
- }
- chunk_buffer_.clear();
- }
- document_size_ = current_pos_;
- client_->OnDocumentComplete();
- return;
- }
-
- request_pending_ = false;
- pending_requests_.pop_front();
-
- // If there are more pending request - continue downloading.
- if (!pending_requests_.empty()) {
- DownloadPendingRequests();
- return;
- }
-
- if (IsDocumentComplete()) {
- client_->OnDocumentComplete();
- return;
- }
-
- if (header_request_)
- client_->OnPartialDocumentLoaded();
- else
- client_->OnPendingRequestComplete();
- header_request_ = false;
-
- // The OnPendingRequestComplete could have added more requests.
- if (!pending_requests_.empty()) {
- DownloadPendingRequests();
- } else {
- // Document is not complete and we have no outstanding requests.
- // Let's keep downloading PDF file in small chunks.
- uint32 pos = chunk_stream_.GetFirstMissingByte();
- std::vector<std::pair<size_t, size_t> > ranges;
- chunk_stream_.GetMissedRanges(pos, GetRequestSize(), &ranges);
- DCHECK(ranges.size() > 0);
- RequestData(ranges[0].first, ranges[0].second);
- }
-}
-
-uint32 DocumentLoader::GetRequestSize() const {
- // Document loading strategy:
- // For first 10 requests, we use 32k chunk sizes, for the next 10 requests we
- // double the size (64k), and so on, until we cap max request size at 2M for
- // 71 or more requests.
- uint32 limited_count = std::min(std::max(requests_count_, 10u), 70u);
- return 32*1024 * (1 << ((limited_count - 1) / 10u));
-}
-
-} // namespace chrome_pdf