Sha256: fa665525d57fcb372b988ec136b57ad2fa54141283c14c5f6d8200b0968b0989
Contents?: true
Size: 1.32 KB
Versions: 16
Compression:
Stored size: 1.32 KB
Contents
# frozen_string_literal: true
# Sends writes to the given `io`, and also registers all the data passing
# through it in a CRC32 checksum calculator. Is made to be completely
# interchangeable with the DeflatedWriter in terms of interface.
class ZipTricks::Streamer::StoredWriter
# The amount of bytes we will buffer before computing the intermediate
# CRC32 checksums. Benchmarks show that the optimum is 64KB (see
# `bench/buffered_crc32_bench.rb), if that is exceeded Zlib is going
# to perform internal CRC combine calls which will make the speed go down again.
CRC32_BUFFER_SIZE = 64 * 1024
def initialize(io)
@io = ZipTricks::WriteAndTell.new(io)
@crc = ZipTricks::WriteBuffer.new(ZipTricks::StreamCRC32.new, CRC32_BUFFER_SIZE)
end
# Writes the given data to the contained IO object.
#
# @param data[String] data to be written
# @return self
def <<(data)
@io << data
@crc << data
self
end
# Returns the amount of data written and the CRC32 checksum. The return value
# can be directly used as the argument to {Streamer#update_last_entry_and_write_data_descriptor}
#
# @param data[String] data to be written
# @return [Hash] a hash of `{crc32, compressed_size, uncompressed_size}`
def finish
{crc32: @crc.to_i, compressed_size: @io.tell, uncompressed_size: @io.tell}
end
end
Version data entries
16 entries across 16 versions & 1 rubygems