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
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
/*
* Copyright (c) 2012, Chris Johns <chrisj@rtems.org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/**
* @file
*
* @ingroup rtems-ld
*
* @brief RTEMS Linker compression handles compressed images.
*
*/
#if !defined (_RLD_COMPRESSION_H_)
#define _RLD_COMPRESSION_H_
#include <rld-files.h>
namespace rld
{
namespace compress
{
/**
* A compressor.
*/
class compressor
{
public:
/**
* Construct the compressor for the given image.
*
* @param image The image to read or write to.
* @param size The size of the input and output buffers.
* @param compress Set to false to disable compression.
*/
compressor (files::image& image,
size_t size,
bool compress = true);
/**
* Destruct the compressor.
*/
~compressor ();
/**
* Write the data to the output buffer and once the image buffer is full
* compress and write the compressed data to the image.
*
* @param data The data to write to the image compressed
* @param length The mount of data in bytes to write.
*/
void write (const void* data, size_t length);
/**
* Write the section of the input image file to the output buffer and
* once the image buffer is full compress and write the compressed data
* to the image.
*
* @param input The input image.
* @param offset The input image offset to read from.
* @param length The mount of data in bytes to write.
*/
void write (files::image& input, off_t offset, size_t length);
/**
* Flush the output buffer is data is present.
*/
void flush ();
/**
* The amount of uncompressed data transferred.
*
* @param return size_t The amount of data tranferred.
*/
size_t transferred () const;
/**
* The amount of compressed data transferred.
*
* @param return size_t The amount of compressed data tranferred.
*/
size_t compressed () const;
private:
files::image& image; //< The image to read or write to or from.
size_t size; //< The size of the buffer.
bool compress; //< If true compress the data.
uint8_t* buffer; //< The decompressed buffer
uint8_t* io; //< The I/O buffer.
size_t level; //< The amount of data in the buffer.
size_t total; //< The amount of uncompressed data
// transferred.
size_t total_compressed; //< The amount of compressed data
// transferred.
};
/**
* Compressor template function for writing data to the compressor..
*/
template < typename T >
void write (compressor& comp, const T value)
{
uint8_t bytes[sizeof (T)];
T v = value;
int b = sizeof (T) - 1;
while (b > 0)
{
bytes[b--] = (uint8_t) v;
v >>= 8;
}
comp.write (bytes, sizeof (T));
}
}
}
static inline rld::compress::compressor& operator<< (rld::compress::compressor& comp,
const uint64_t value) {
rld::compress::write < uint64_t > (comp, value);
return comp;
}
static inline rld::compress::compressor& operator<< (rld::compress::compressor& comp,
const uint32_t value) {
rld::compress::write < uint32_t > (comp, value);
return comp;
}
static inline rld::compress::compressor& operator<< (rld::compress::compressor& comp,
const std::string& str) {
comp.write (str.c_str (), str.size ());
return comp;
}
#endif
|
