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| 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 #ifndef PDF_PDFIUM_PDFIUM_API_STRING_BUFFER_ADAPTER_H_ |
| 6 #define PDF_PDFIUM_PDFIUM_API_STRING_BUFFER_ADAPTER_H_ |
| 7 |
| 8 #include "base/basictypes.h" |
| 9 |
| 10 namespace chrome_pdf { |
| 11 |
| 12 // Helper to deal with the fact that many PDFium APIs write the null-terminator |
| 13 // into string buffers that are passed to them, but the PDF plugin likes to pass |
| 14 // in std::strings / base::string16s, where one should not count on the internal |
| 15 // string buffers to be null-terminated. |
| 16 |
| 17 template <class StringType> |
| 18 class PDFiumAPIStringBufferAdapter { |
| 19 public: |
| 20 // |str| is the string to write into. |
| 21 // |expected_size| is the number of characters the PDFium API will write, |
| 22 // including the null-terminator. It should be at least 1. |
| 23 // |check_expected_size| whether to check the actual number of characters |
| 24 // written into |str| against |expected_size| when calling Close(). |
| 25 PDFiumAPIStringBufferAdapter(StringType* str, |
| 26 size_t expected_size, |
| 27 bool check_expected_size); |
| 28 ~PDFiumAPIStringBufferAdapter(); |
| 29 |
| 30 // Returns a pointer to |str_|'s buffer. The buffer's size is large enough to |
| 31 // hold |expected_size_| + 1 characters, so the PDFium API that uses the |
| 32 // pointer has space to write a null-terminator. |
| 33 void* GetData(); |
| 34 |
| 35 // Resizes |str_| to |actual_size| - 1 characters, thereby removing the extra |
| 36 // null-terminator. This must be called prior to the adapter's destruction. |
| 37 // The pointer returned by GetData() should be considered invalid. |
| 38 void Close(int actual_size); |
| 39 void Close(size_t actual_size); |
| 40 |
| 41 private: |
| 42 StringType* const str_; |
| 43 void* const data_; |
| 44 const size_t expected_size_; |
| 45 const bool check_expected_size_; |
| 46 bool is_closed_; |
| 47 |
| 48 DISALLOW_COPY_AND_ASSIGN(PDFiumAPIStringBufferAdapter); |
| 49 }; |
| 50 |
| 51 } // namespace chrome_pdf |
| 52 |
| 53 #endif // PDF_PDFIUM_PDFIUM_API_STRING_BUFFER_ADAPTER_H_ |
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