Botan 3.3.0
Crypto and TLS for C&
lzma.cpp
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1/*
2* Lzma Compressor
3* (C) 2001 Peter J Jones
4* 2001-2007,2014 Jack Lloyd
5* 2006 Matt Johnston
6* 2012 Vojtech Kral
7*
8* Botan is released under the Simplified BSD License (see license.txt)
9*/
10
11#include <botan/lzma.h>
12
13#include <botan/exceptn.h>
14#include <botan/internal/compress_utils.h>
15#include <lzma.h>
16
17namespace Botan {
18
19namespace {
20
21class LZMA_Stream : public Zlib_Style_Stream<lzma_stream, uint8_t> {
22 public:
23 LZMA_Stream() {
24 m_allocator.opaque = alloc();
25 m_allocator.alloc = Compression_Alloc_Info::malloc<size_t>;
26 m_allocator.free = Compression_Alloc_Info::free;
27 streamp()->allocator = &m_allocator;
28 }
29
30 ~LZMA_Stream() override { ::lzma_end(streamp()); }
31
32 LZMA_Stream(const LZMA_Stream& other) = delete;
33 LZMA_Stream(LZMA_Stream&& other) = delete;
34 LZMA_Stream& operator=(const LZMA_Stream& other) = delete;
35 LZMA_Stream& operator=(LZMA_Stream&& other) = delete;
36
37 bool run(uint32_t flags) override {
38 lzma_ret rc = ::lzma_code(streamp(), static_cast<lzma_action>(flags));
39
40 if(rc != LZMA_OK && rc != LZMA_STREAM_END) {
41 throw Compression_Error("lzma_code", ErrorType::LzmaError, rc);
42 }
43
44 return (rc == LZMA_STREAM_END);
45 }
46
47 uint32_t run_flag() const override { return LZMA_RUN; }
48
49 uint32_t flush_flag() const override { return LZMA_FULL_FLUSH; }
50
51 uint32_t finish_flag() const override { return LZMA_FINISH; }
52
53 private:
54 ::lzma_allocator m_allocator;
55};
56
57class LZMA_Compression_Stream final : public LZMA_Stream {
58 public:
59 explicit LZMA_Compression_Stream(size_t level) {
60 if(level == 0) {
61 level = 6; // default
62 } else if(level > 9) {
63 level = 9; // clamp to maximum allowed value
64 }
65
66 lzma_ret rc = ::lzma_easy_encoder(streamp(), static_cast<uint32_t>(level), LZMA_CHECK_CRC64);
67
68 if(rc != LZMA_OK) {
69 throw Compression_Error("lzam_easy_encoder", ErrorType::LzmaError, rc);
70 }
71 }
72};
73
74class LZMA_Decompression_Stream final : public LZMA_Stream {
75 public:
76 LZMA_Decompression_Stream() {
77 lzma_ret rc = ::lzma_stream_decoder(streamp(), UINT64_MAX, LZMA_TELL_UNSUPPORTED_CHECK);
78
79 if(rc != LZMA_OK) {
80 throw Compression_Error("lzma_stream_decoder", ErrorType::LzmaError, rc);
81 }
82 }
83};
84
85} // namespace
86
87std::unique_ptr<Compression_Stream> LZMA_Compression::make_stream(size_t level) const {
88 return std::make_unique<LZMA_Compression_Stream>(level);
89}
90
91std::unique_ptr<Compression_Stream> LZMA_Decompression::make_stream() const {
92 return std::make_unique<LZMA_Decompression_Stream>();
93}
94
95} // namespace Botan
static void free(void *self, void *ptr)
int(* final)(unsigned char *, CTX *)
Public Header.