Class: Gitrb::Pack

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

Constant Summary collapse

PACK_IDX_SIGNATURE = 
"\377tOc"
OBJ_COMMIT = 
1
OBJ_TREE = 
2
OBJ_BLOB = 
3
OBJ_TAG = 
4
OBJ_OFS_DELTA = 
6
OBJ_REF_DELTA = 
7
OBJ_TYPES = 
[nil, 'commit', 'tree', 'blob', 'tag'].freeze
FanOutCount = 
256
SHA1Size = 
20
IdxOffsetSize = 
4
OffsetSize = 
4
CrcSize = 
4
OffsetStart = 
FanOutCount * IdxOffsetSize
SHA1Start = 
OffsetStart + OffsetSize
EntrySize = 
OffsetSize + SHA1Size
EntrySizeV2 = 
SHA1Size + CrcSize + OffsetSize

Instance Method Summary collapse

Constructor Details

#initialize(file) ⇒ Pack

Returns a new instance of Pack.



55
56
57
58
59
 
# File 'lib/gitrb/pack.rb', line 55

def initialize(file)
  file = file[0...-3] + 'pack' if file =~ /\.idx$/
  @name = file
  init_pack
end

Instance Method Details

#each_object ⇒ Object 



61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
 
# File 'lib/gitrb/pack.rb', line 61

def each_object
  with_idx do |idx|
    if @version == 2
      data = read_data_v2(idx)
      data.each do |sha1, crc, offset|
        sha1 = sha1.unpack("H*").first
        yield sha1, offset
      end
    else
      pos = OffsetStart
      @size.times do
        offset = idx[pos,OffsetSize].unpack('N')[0]
        sha1 = idx[pos+OffsetSize,SHA1Size]
        pos += EntrySize
        sha1 = sha1.unpack("H*").first
        yield sha1, offset
      end
    end
  end
end

#get_object(offset) ⇒ Object 



82
83
84
85
86
87
 
# File 'lib/gitrb/pack.rb', line 82

def get_object(offset)
  data, type = with_pack do |packfile|
    unpack_object(packfile, offset)
  end
  [data, OBJ_TYPES[type]]
end