Class: PackfileReader::PackfileEntry

Inherits:
Object
  • Object
show all
Defined in:
lib/packfile_reader/packfile_entry.rb

Constant Summary collapse

ZLIB_HEADERS =

ZLIB RFC: tools.ietf.org/html/rfc1950

[
  0b0111100000000001, #0x78 0x01
  0b0111100010011100, #0x78 0x9c
  0b0111100011011010, #0x78 0xda
]

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Attribute Details

#id ⇒ Object (readonly)

Returns the value of attribute id.



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# File 'lib/packfile_reader/packfile_entry.rb', line 9

def id
  @id
end

#size ⇒ Object (readonly)

Returns the value of attribute size.



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# File 'lib/packfile_reader/packfile_entry.rb', line 8

def size
  @size
end

#type ⇒ Object (readonly)

Returns the value of attribute type.



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# File 'lib/packfile_reader/packfile_entry.rb', line 7

def type
  @type
end

Class Method Details

.next_entry(packfile_io, objects_to_find = :any, log_verbose = false, window_size = 10_000) ⇒ Object

Accepts a block that will receive the compressed data, uncompressed data and the computed object id. Window size is the amount of bytes to read at once while searching for the compressed data



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# File 'lib/packfile_reader/packfile_entry.rb', line 21

def self.next_entry(packfile_io, objects_to_find=:any, log_verbose=false, window_size=10_000)
  raise 'Object id must be a valid sha1' unless objects_to_find == :any || objects_to_find.all? {|id| /^[0-9a-f]{40}$/.match? id }

  loop do
    return nil if packfile_io.eof?

    hunk = PackfileReader::Hunk.new_with_type(packfile_io)

    type = hunk.type
    size = hunk.size
    offset = hunk.offset_size

    # Clean the current line before printing the message
    $stderr.puts "\u001b[0K>>>> Processing new entry [#{type}]" if log_verbose
    while hunk.continuation?
      hunk = PackfileReader::Hunk.new_without_type(packfile_io)
      size = (hunk.size << offset) | size # Data size is a combination of all hunk sizes
      offset += hunk.offset_size
    end

    compressed_data, uncompressed_data = find_data(packfile_io, log_verbose, window_size)
    object_id = compute_id(type, size, uncompressed_data)

    type = "#{type} [CORRUPTED] " if uncompressed_data.nil?

    if objects_to_find == :any || objects_to_find.member?(object_id)
      yield compressed_data, uncompressed_data, object_id if block_given?
      return PackfileEntry.new(type, size, object_id)
    end
  end
end