Class: Pack::Reader

Inherits:
Object
  • Object
show all
Defined in:
lib/pack/reader.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(input) ⇒ Reader

Returns a new instance of Reader.



11
12
13
 
# File 'lib/pack/reader.rb', line 11

def initialize(input)
  @input = input
end

Instance Attribute Details

#count ⇒ Object (readonly)

Returns the value of attribute count.



9
10
11
 
# File 'lib/pack/reader.rb', line 9

def count
  @count
end

Instance Method Details

#read_header ⇒ Object 



15
16
17
18
19
20
21
22
23
24
25
26
 
# File 'lib/pack/reader.rb', line 15

def read_header
  data = @input.read(HEADER_SIZE)
  signature, version, @count = data.unpack(HEADER_FORMAT)

  unless signature == SIGNATURE
    raise InvalidPack, "bad pack signature: #{ signature }"
  end

  unless version == VERSION
    raise InvalidPack, "unsupported pack version: #{ version }"
  end
end

#read_info ⇒ Object 



41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
 
# File 'lib/pack/reader.rb', line 41

def read_info
  type, size = read_record_header

  case type
  when COMMIT, TREE, BLOB
    Record.new(TYPE_CODES.key(type), size)

  when OFS_DELTA
    delta = read_ofs_delta
    size  = Expander.new(delta.delta_data).target_size

    OfsDelta.new(delta.base_ofs, size)

  when REF_DELTA
    delta = read_ref_delta
    size  = Expander.new(delta.delta_data).target_size

    RefDelta.new(delta.base_oid, size)
  end
end

#read_record ⇒ Object 



28
29
30
31
32
33
34
35
36
37
38
39
 
# File 'lib/pack/reader.rb', line 28

def read_record
  type, _ = read_record_header

  case type
  when COMMIT, TREE, BLOB
    Record.new(TYPE_CODES.key(type), read_zlib_stream)
  when OFS_DELTA
    read_ofs_delta
  when REF_DELTA
    read_ref_delta
  end
end