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
|
# -*- encoding: ascii-8bit -*-
require File.expand_path('../../../../spec_helper', __FILE__)
require File.expand_path('../../fixtures/classes', __FILE__)
require File.expand_path('../shared/basic', __FILE__)
describe "String#unpack with format 'B'" do
it_behaves_like :string_unpack_basic, 'B'
it_behaves_like :string_unpack_no_platform, 'B'
it "decodes one bit from each byte for each format character starting with the most significant bit" do
[ ["\x00", "B", ["0"]],
["\x80", "B", ["1"]],
["\x0f", "B", ["0"]],
["\x8f", "B", ["1"]],
["\x7f", "B", ["0"]],
["\xff", "B", ["1"]],
["\x80\x00", "BB", ["1", "0"]],
["\x8f\x00", "BB", ["1", "0"]],
["\x80\x0f", "BB", ["1", "0"]],
["\x80\x8f", "BB", ["1", "1"]],
["\x80\x80", "BB", ["1", "1"]],
["\x0f\x80", "BB", ["0", "1"]]
].should be_computed_by(:unpack)
end
it "decodes only the number of bits in the string when passed a count" do
"\x83".unpack("B25").should == ["10000011"]
end
it "decodes multiple differing bit counts from a single string" do
str = "\xaa\xaa\xaa\xaa\x55\xaa\xd4\xc3\x6b\xd7\xaa\xd7\xc3\xd4\xaa\x6b\xd7\xaa"
array = str.unpack("B5B6B7B8B9B10B13B14B16B17")
array.should == ["10101", "101010", "1010101", "10101010", "010101011",
"1101010011", "0110101111010", "10101010110101",
"1100001111010100", "10101010011010111"]
end
it "decodes a directive with a '*' modifier after a directive with a count modifier" do
"\xd4\xc3\x6b\xd7".unpack("B5B*").should == ["11010", "110000110110101111010111"]
end
it "decodes a directive with a count modifier after a directive with a '*' modifier" do
"\xd4\xc3\x6b\xd7".unpack("B*B5").should == ["11010100110000110110101111010111", ""]
end
it "decodes the number of bits specified by the count modifier" do
[ ["\x00", "B0", [""]],
["\x80", "B1", ["1"]],
["\x7f", "B2", ["01"]],
["\x8f", "B3", ["100"]],
["\x7f", "B4", ["0111"]],
["\xff", "B5", ["11111"]],
["\xf8", "B6", ["111110"]],
["\x9c", "B7", ["1001110"]],
["\xbd", "B8", ["10111101"]],
["\x80\x80", "B9", ["100000001"]],
["\x80\x70", "B10", ["1000000001"]],
["\x80\x20", "B11", ["10000000001"]],
["\x8f\x10", "B12", ["100011110001"]],
["\x8f\x0f", "B13", ["1000111100001"]],
["\x80\x0f", "B14", ["10000000000011"]],
["\x80\x8f", "B15", ["100000001000111"]],
["\x0f\x81", "B16", ["0000111110000001"]]
].should be_computed_by(:unpack)
end
it "decodes all the bits when passed the '*' modifier" do
[ ["", [""]],
["\x00", ["00000000"]],
["\x80", ["10000000"]],
["\x7f", ["01111111"]],
["\x81", ["10000001"]],
["\x0f", ["00001111"]],
["\x80\x80", ["1000000010000000"]],
["\x8f\x10", ["1000111100010000"]],
["\x00\x10", ["0000000000010000"]]
].should be_computed_by(:unpack, "B*")
end
it "adds an empty string for each element requested beyond the end of the String" do
[ ["", ["", "", ""]],
["\x80", ["1", "", ""]],
["\x80\x08", ["1", "0", ""]]
].should be_computed_by(:unpack, "BBB")
end
it "ignores NULL bytes between directives" do
"\x80\x00".unpack("B\x00B").should == ["1", "0"]
end
it "ignores spaces between directives" do
"\x80\x00".unpack("B B").should == ["1", "0"]
end
end
describe "String#unpack with format 'b'" do
it_behaves_like :string_unpack_basic, 'b'
it_behaves_like :string_unpack_no_platform, 'b'
it "decodes one bit from each byte for each format character starting with the least significant bit" do
[ ["\x00", "b", ["0"]],
["\x01", "b", ["1"]],
["\xf0", "b", ["0"]],
["\xf1", "b", ["1"]],
["\xfe", "b", ["0"]],
["\xff", "b", ["1"]],
["\x01\x00", "bb", ["1", "0"]],
["\xf1\x00", "bb", ["1", "0"]],
["\x01\xf0", "bb", ["1", "0"]],
["\x01\xf1", "bb", ["1", "1"]],
["\x01\x01", "bb", ["1", "1"]],
["\xf0\x01", "bb", ["0", "1"]]
].should be_computed_by(:unpack)
end
it "decodes only the number of bits in the string when passed a count" do
"\x83".unpack("b25").should == ["11000001"]
end
it "decodes multiple differing bit counts from a single string" do
str = "\xaa\xaa\xaa\xaa\x55\xaa\xd4\xc3\x6b\xd7\xaa\xd7\xc3\xd4\xaa\x6b\xd7\xaa"
array = str.unpack("b5b6b7b8b9b10b13b14b16b17")
array.should == ["01010", "010101", "0101010", "01010101", "101010100",
"0010101111", "1101011011101", "01010101111010",
"1100001100101011", "01010101110101101"]
end
it "decodes a directive with a '*' modifier after a directive with a count modifier" do
"\xd4\xc3\x6b\xd7".unpack("b5b*").should == ["00101", "110000111101011011101011"]
end
it "decodes a directive with a count modifier after a directive with a '*' modifier" do
"\xd4\xc3\x6b\xd7".unpack("b*b5").should == ["00101011110000111101011011101011", ""]
end
it "decodes the number of bits specified by the count modifier" do
[ ["\x00", "b0", [""]],
["\x01", "b1", ["1"]],
["\xfe", "b2", ["01"]],
["\xfc", "b3", ["001"]],
["\xf7", "b4", ["1110"]],
["\xff", "b5", ["11111"]],
["\xfe", "b6", ["011111"]],
["\xce", "b7", ["0111001"]],
["\xbd", "b8", ["10111101"]],
["\x01\xff", "b9", ["100000001"]],
["\x01\xfe", "b10", ["1000000001"]],
["\x01\xfc", "b11", ["10000000001"]],
["\xf1\xf8", "b12", ["100011110001"]],
["\xe1\xf1", "b13", ["1000011110001"]],
["\x03\xe0", "b14", ["11000000000001"]],
["\x47\xc0", "b15", ["111000100000001"]],
["\x81\x0f", "b16", ["1000000111110000"]]
].should be_computed_by(:unpack)
end
it "decodes all the bits when passed the '*' modifier" do
[ ["", [""]],
["\x00", ["00000000"]],
["\x80", ["00000001"]],
["\x7f", ["11111110"]],
["\x81", ["10000001"]],
["\x0f", ["11110000"]],
["\x80\x80", ["0000000100000001"]],
["\x8f\x10", ["1111000100001000"]],
["\x00\x10", ["0000000000001000"]]
].should be_computed_by(:unpack, "b*")
end
it "adds an empty string for each element requested beyond the end of the String" do
[ ["", ["", "", ""]],
["\x01", ["1", "", ""]],
["\x01\x80", ["1", "0", ""]]
].should be_computed_by(:unpack, "bbb")
end
it "ignores NULL bytes between directives" do
"\x01\x00".unpack("b\x00b").should == ["1", "0"]
end
it "ignores spaces between directives" do
"\x01\x00".unpack("b b").should == ["1", "0"]
end
end
|
