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
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
/**
* Copyright (c) 2016-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
#include "Options.h"
#include <cstdio>
#include <cstring>
#include <thread>
namespace pzstd {
namespace {
unsigned parseUnsigned(const char* arg) {
unsigned result = 0;
while (*arg >= '0' && *arg <= '9') {
result *= 10;
result += *arg - '0';
++arg;
}
return result;
}
const std::string zstdExtension = ".zst";
constexpr unsigned defaultCompressionLevel = 3;
constexpr unsigned maxNonUltraCompressionLevel = 19;
void usage() {
std::fprintf(stderr, "Usage:\n");
std::fprintf(stderr, "\tpzstd [args] FILE\n");
std::fprintf(stderr, "Parallel ZSTD options:\n");
std::fprintf(stderr, "\t-n/--num-threads #: Number of threads to spawn\n");
std::fprintf(stderr, "\t-p/--pzstd-headers: Write pzstd headers to enable parallel decompression\n");
std::fprintf(stderr, "ZSTD options:\n");
std::fprintf(stderr, "\t-u/--ultra : enable levels beyond %i, up to %i (requires more memory)\n", maxNonUltraCompressionLevel, ZSTD_maxCLevel());
std::fprintf(stderr, "\t-h/--help : display help and exit\n");
std::fprintf(stderr, "\t-V/--version : display version number and exit\n");
std::fprintf(stderr, "\t-d/--decompress : decompression\n");
std::fprintf(stderr, "\t-f/--force : overwrite output\n");
std::fprintf(stderr, "\t-o/--output file : result stored into `file`\n");
std::fprintf(stderr, "\t-c/--stdout : write output to standard output\n");
std::fprintf(stderr, "\t-# : # compression level (1-%d, default:%d)\n", maxNonUltraCompressionLevel, defaultCompressionLevel);
}
} // anonymous namespace
Options::Options()
: numThreads(0),
maxWindowLog(23),
compressionLevel(defaultCompressionLevel),
decompress(false),
overwrite(false),
pzstdHeaders(false) {}
bool Options::parse(int argc, const char** argv) {
bool ultra = false;
for (int i = 1; i < argc; ++i) {
const char* arg = argv[i];
// Arguments with a short option
char option = 0;
if (!std::strcmp(arg, "--num-threads")) {
option = 'n';
} else if (!std::strcmp(arg, "--pzstd-headers")) {
option = 'p';
} else if (!std::strcmp(arg, "--ultra")) {
option = 'u';
} else if (!std::strcmp(arg, "--version")) {
option = 'V';
} else if (!std::strcmp(arg, "--help")) {
option = 'h';
} else if (!std::strcmp(arg, "--decompress")) {
option = 'd';
} else if (!std::strcmp(arg, "--force")) {
option = 'f';
} else if (!std::strcmp(arg, "--output")) {
option = 'o';
} else if (!std::strcmp(arg, "--stdout")) {
option = 'c';
}else if (arg[0] == '-' && arg[1] != 0) {
// Parse the compression level or short option
if (arg[1] >= '0' && arg[1] <= '9') {
compressionLevel = parseUnsigned(arg + 1);
continue;
}
option = arg[1];
} else if (inputFile.empty()) {
inputFile = arg;
continue;
} else {
std::fprintf(stderr, "Invalid argument: %s.\n", arg);
return false;
}
switch (option) {
case 'n':
if (++i == argc) {
std::fprintf(stderr, "Invalid argument: -n requires an argument.\n");
return false;
}
numThreads = parseUnsigned(argv[i]);
if (numThreads == 0) {
std::fprintf(stderr, "Invalid argument: # of threads must be > 0.\n");
return false;
}
break;
case 'p':
pzstdHeaders = true;
break;
case 'u':
ultra = true;
maxWindowLog = 0;
break;
case 'V':
std::fprintf(stderr, "ZSTD version: %s.\n", ZSTD_VERSION_STRING);
return false;
case 'h':
usage();
return false;
case 'd':
decompress = true;
break;
case 'f':
overwrite = true;
break;
case 'o':
if (++i == argc) {
std::fprintf(stderr, "Invalid argument: -o requires an argument.\n");
return false;
}
outputFile = argv[i];
break;
case 'c':
outputFile = '-';
break;
default:
std::fprintf(stderr, "Invalid argument: %s.\n", arg);
return false;
}
}
// Determine input file if not specified
if (inputFile.empty()) {
inputFile = "-";
}
// Determine output file if not specified
if (outputFile.empty()) {
if (inputFile == "-") {
outputFile = "-";
} else {
// Attempt to add/remove zstd extension from the input file
if (decompress) {
int stemSize = inputFile.size() - zstdExtension.size();
if (stemSize > 0 && inputFile.substr(stemSize) == zstdExtension) {
outputFile = inputFile.substr(0, stemSize);
} else {
std::fprintf(
stderr, "Invalid argument: Unable to determine output file.\n");
return false;
}
} else {
outputFile = inputFile + zstdExtension;
}
}
}
// Check compression level
{
unsigned maxCLevel = ultra ? ZSTD_maxCLevel() : maxNonUltraCompressionLevel;
if (compressionLevel > maxCLevel) {
std::fprintf(
stderr, "Invalid compression level %u.\n", compressionLevel);
return false;
}
}
// Check that numThreads is set
if (numThreads == 0) {
numThreads = std::thread::hardware_concurrency();
if (numThreads == 0) {
std::fprintf(stderr, "Invalid arguments: # of threads not specified "
"and unable to determine hardware concurrency.\n");
return false;
}
}
return true;
}
}
|
