aboutsummaryrefslogtreecommitdiffstats
path: root/src/lib/compression/compress_utils.h
blob: 90244a8c00db2cf8e9cb781c481e34e94cc18642 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
/*
* Compression utility header
* (C) 2014 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#ifndef BOTAN_COMPRESSION_UTILS_H_
#define BOTAN_COMPRESSION_UTILS_H_

#include <botan/compression.h>
#include <memory>
#include <unordered_map>

namespace Botan {

/*
* Allocation Size Tracking Helper for Zlib/Bzlib/LZMA
*/
class Compression_Alloc_Info
   {
   public:
      template<typename T>
      static void* malloc(void* self, T n, T size)
         {
         return static_cast<Compression_Alloc_Info*>(self)->do_malloc(n, size);
         }

      static void free(void* self, void* ptr)
         {
         static_cast<Compression_Alloc_Info*>(self)->do_free(ptr);
         }

   private:
      void* do_malloc(size_t n, size_t size);
      void do_free(void* ptr);

      std::unordered_map<void*, size_t> m_current_allocs;
   };

/**
* Wrapper for Zlib/Bzlib/LZMA stream types
*/
template<typename Stream, typename ByteType>
class Zlib_Style_Stream : public Compression_Stream
   {
   public:
      void next_in(uint8_t* b, size_t len) override
         {
         m_stream.next_in = reinterpret_cast<ByteType*>(b);
         m_stream.avail_in = len;
         }

      void next_out(uint8_t* b, size_t len) override
         {
         m_stream.next_out = reinterpret_cast<ByteType*>(b);
         m_stream.avail_out = len;
         }

      size_t avail_in() const override { return m_stream.avail_in; }

      size_t avail_out() const override { return m_stream.avail_out; }

      Zlib_Style_Stream()
         {
         clear_mem(&m_stream, 1);
         m_allocs.reset(new Compression_Alloc_Info);
         }

      ~Zlib_Style_Stream()
         {
         clear_mem(&m_stream, 1);
         m_allocs.reset();
         }

   protected:
      typedef Stream stream_t;

      stream_t* streamp() { return &m_stream; }

      Compression_Alloc_Info* alloc() { return m_allocs.get(); }
   private:
      stream_t m_stream;
      std::unique_ptr<Compression_Alloc_Info> m_allocs;
   };

}

#endif