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      1 // Copyright 2013 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 CHROME_UTILITY_MEDIA_GALLERIES_PMP_COLUMN_READER_H_
      6 #define CHROME_UTILITY_MEDIA_GALLERIES_PMP_COLUMN_READER_H_
      7 
      8 #include <string>
      9 #include <vector>
     10 
     11 #include "base/basictypes.h"
     12 #include "base/memory/scoped_ptr.h"
     13 #include "chrome/common/media_galleries/pmp_constants.h"
     14 
     15 namespace base {
     16 class File;
     17 class FilePath;
     18 }
     19 
     20 namespace picasa {
     21 
     22 // Reads a single PMP column from a file.
     23 class PmpColumnReader {
     24  public:
     25   PmpColumnReader();
     26   virtual ~PmpColumnReader();
     27 
     28   // Returns true if read successfully.
     29   // |rows_read| is undefined if returns false.
     30   bool ReadFile(base::File* file, const PmpFieldType expected_type);
     31 
     32   // These functions read the value of that |row| into |result|.
     33   // Functions return false if the column is of the wrong type or the row
     34   // is out of range. May only be called after successful ReadColumn.
     35   bool ReadString(const uint32 row, std::string* result) const;
     36   bool ReadUInt32(const uint32 row, uint32* result) const;
     37   bool ReadDouble64(const uint32 row, double* result) const;
     38   bool ReadUInt8(const uint32 row, uint8* result) const;
     39   bool ReadUInt64(const uint32 row, uint64* result) const;
     40 
     41   // May only be called after successful ReadColumn.
     42   uint32 rows_read() const;
     43 
     44  private:
     45   bool ParseData(const PmpFieldType expected_type);
     46   // Returns the number of bytes parsed in the body, or, -1 on failure.
     47   int64 IndexStrings();
     48 
     49   // Source data
     50   scoped_ptr<uint8[]> data_;
     51   int64 length_;
     52 
     53   // Header data
     54   PmpFieldType field_type_;
     55   uint32 rows_read_;
     56 
     57   // Index of string start locations if fields are strings. Empty otherwise.
     58   std::vector<const char*> strings_;
     59 
     60   DISALLOW_COPY_AND_ASSIGN(PmpColumnReader);
     61 };
     62 
     63 }  // namespace picasa
     64 
     65 #endif  // CHROME_UTILITY_MEDIA_GALLERIES_PMP_COLUMN_READER_H_
     66