Botan 2.19.5 Crypto and TLS for C&

bzip2.cpp
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1/*
2* Bzip2 Compressor
3* (C) 2001 Peter J Jones
4* 2001-2007,2014 Jack Lloyd
5* 2006 Matt Johnston
6*
7* Botan is released under the Simplified BSD License (see license.txt)
8*/
9
10#include <botan/bzip2.h>
11#include <botan/exceptn.h>
12#include <botan/internal/compress_utils.h>
13
14#define BZ_NO_STDIO
15#include <bzlib.h>
16
17 namespace Botan {
18
19 namespace {
20
21 class Bzip2_Stream : public Zlib_Style_Stream<bz_stream, char>
22 {
23 public:
24 Bzip2_Stream()
25 {
26 streamp()->opaque = alloc();
27 streamp()->bzalloc = Compression_Alloc_Info::malloc<int>;
28 streamp()->bzfree = Compression_Alloc_Info::free;
29 }
30
31 uint32_t run_flag() const override { return BZ_RUN; }
32 uint32_t flush_flag() const override { return BZ_FLUSH; }
33 uint32_t finish_flag() const override { return BZ_FINISH; }
34 };
35
36 class Bzip2_Compression_Stream final : public Bzip2_Stream
37 {
38 public:
39 explicit Bzip2_Compression_Stream(size_t block_size)
40 {
41 /*
42 * Defaults to 900k blocks as the computation cost of
43 * compression is not overly affected by the size, though
44 * more memory is required.
45 */
46 if(block_size == 0 || block_size >= 9)
47 block_size = 9;
48
49 int rc = BZ2_bzCompressInit(streamp(), block_size, 0, 0);
50
51 if(rc != BZ_OK)
52 throw Compression_Error("BZ2_bzCompressInit", ErrorType::Bzip2Error, rc);
53 }
54
55 ~Bzip2_Compression_Stream()
56 {
57 BZ2_bzCompressEnd(streamp());
58 }
59
60 bool run(uint32_t flags) override
61 {
62 int rc = BZ2_bzCompress(streamp(), flags);
63
64 if(rc < 0)
65 throw Compression_Error("BZ2_bzCompress", ErrorType::Bzip2Error, rc);
66
67 return (rc == BZ_STREAM_END);
68 }
69 };
70
71 class Bzip2_Decompression_Stream final : public Bzip2_Stream
72 {
73 public:
74 Bzip2_Decompression_Stream()
75 {
76 int rc = BZ2_bzDecompressInit(streamp(), 0, 0);
77
78 if(rc != BZ_OK)
79 throw Compression_Error("BZ2_bzDecompressInit", ErrorType::Bzip2Error, rc);
80 }
81
82 ~Bzip2_Decompression_Stream()
83 {
84 BZ2_bzDecompressEnd(streamp());
85 }
86
87 bool run(uint32_t) override
88 {
89 int rc = BZ2_bzDecompress(streamp());
90
91 if(rc != BZ_OK && rc != BZ_STREAM_END)
92 throw Compression_Error("BZ2_bzDecompress", ErrorType::Bzip2Error, rc);
93
94 return (rc == BZ_STREAM_END);
95 }
96 };
97
98}
99
100Compression_Stream* Bzip2_Compression::make_stream(size_t comp_level) const
101 {
102 return new Bzip2_Compression_Stream(comp_level);
103 }
104
105Compression_Stream* Bzip2_Decompression::make_stream() const
106 {
107 return new Bzip2_Decompression_Stream;
108 }
109
110}
Botan::Compression_Alloc_Info::free
static void free(void *self, void *ptr)
Definition: compress_utils.h:29
final
int(* final)(unsigned char *, CTX *)
Definition: commoncrypto_hash.cpp:29
Botan::PKCS11::flags
Flags flags(Flag flags)
Definition: p11.h:860
Botan
Definition: alg_id.cpp:13
Botan::ErrorType::Bzip2Error
@ Bzip2Error