pdf/pdfium/pdfium_api_string_buffer_adapter.cc

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "pdf/pdfium/pdfium_api_string_buffer_adapter.h"
   6
   7 #include <string>
   8
   9 #include "base/logging.h"
  10 #include "base/numerics/safe_math.h"
  11 #include "base/strings/string16.h"
  12 #include "base/strings/string_util.h"
  13
  14 namespace chrome_pdf {
  15
  16 template <class StringType>
  17 PDFiumAPIStringBufferAdapter<StringType>::PDFiumAPIStringBufferAdapter(
  18     StringType* str,
  19     size_t expected_size,
  20     bool check_expected_size)
  21     : str_(str),
  22       data_(WriteInto(str, expected_size + 1)),
  23       expected_size_(expected_size),
  24       check_expected_size_(check_expected_size),
  25       is_closed_(false) {
  26 }
  27
  28 template <class StringType>
  29 PDFiumAPIStringBufferAdapter<StringType>::~PDFiumAPIStringBufferAdapter() {
  30   DCHECK(is_closed_);
  31 }
  32
  33 template <class StringType>
  34 void* PDFiumAPIStringBufferAdapter<StringType>::GetData() {
  35   DCHECK(!is_closed_);
  36   return data_;
  37 }
  38
  39 template <class StringType>
  40 void PDFiumAPIStringBufferAdapter<StringType>::Close(int actual_size) {
  41   base::CheckedNumeric<size_t> unsigned_size = actual_size;
  42   Close(unsigned_size.ValueOrDie());
  43 }
  44
  45 template <class StringType>
  46 void PDFiumAPIStringBufferAdapter<StringType>::Close(size_t actual_size) {
  47   DCHECK(!is_closed_);
  48   is_closed_ = true;
  49
  50   if (check_expected_size_)
  51     DCHECK_EQ(expected_size_, actual_size);
  52
  53   if (actual_size > 0) {
  54     DCHECK((*str_)[actual_size - 1] == 0);
  55     str_->resize(actual_size - 1);
  56   } else {
  57     str_->clear();
  58   }
  59 }
  60
  61 // explicit instantiations
  62 template class PDFiumAPIStringBufferAdapter<std::string>;
  63 template class PDFiumAPIStringBufferAdapter<base::string16>;
  64
  65 }  // namespace chrome_pdf