class AMFStringBuffer

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
The name of the author may not be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR “AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Public Class Methods

new(str = nil) click to toggle source

# File lib/flv/amf_string_buffer.rb, line 27
def initialize(str = nil)
  @buffer = str || ''
  @pos = 0
end

Public Instance Methods

<<(string)

Alias for: write__STRING

close() click to toggle source

# File lib/flv/amf_string_buffer.rb, line 55
def close
end

eof?() click to toggle source

# File lib/flv/amf_string_buffer.rb, line 66
def eof?
  @pos == length
end

length() click to toggle source

# File lib/flv/amf_string_buffer.rb, line 62
def length
  @buffer.length
end

pos() click to toggle source

# File lib/flv/amf_string_buffer.rb, line 70
def pos
  @pos
end

read(length) click to toggle source

# File lib/flv/amf_string_buffer.rb, line 36
def read(length)
  raise EOFError if @pos + length > @buffer.length
  rt = @buffer[@pos, length]
  @pos += length
  rt
end

read__AMF_array() click to toggle source

# File lib/flv/amf_string_buffer.rb, line 107
def read__AMF_array
  size = read__UI32
  array = []
  (1..size).step do |pos|  
    break if eof?
    array << read__AMF_data
  end
  array
end

read__AMF_boolean() click to toggle source

# File lib/flv/amf_string_buffer.rb, line 82
def read__AMF_boolean
  read__UI8 == 1
end

read__AMF_data(type = nil) click to toggle source

# File lib/flv/amf_string_buffer.rb, line 122
def read__AMF_data(type = nil)
  type ||= read__UI8
  value = case type.to_i
  when  0
    read__AMF_double
  when  1
    read__AMF_boolean
  when  2
    read__AMF_string
  when  3
    read__AMF_object
  when  8
    read__AMF_mixed_array
  when 10
    read__AMF_array
  when 11
    read__AMF_date
  else
  end
  return value
end

read__AMF_date() click to toggle source

# File lib/flv/amf_string_buffer.rb, line 117
def read__AMF_date
  utc_time = Time.at((read__AMF_double / 1000).to_i)
  utc_time + (read__SI16 * 60) - Time.now.gmtoff
end

read__AMF_double() click to toggle source

# File lib/flv/amf_string_buffer.rb, line 78
def read__AMF_double
  num = read(8).unpack('G').first.to_f
end

read__AMF_mixed_array() click to toggle source

# File lib/flv/amf_string_buffer.rb, line 86
def read__AMF_mixed_array
  size = read__UI32 # is not used
  hash = {}
  while !eof?
    key = read__AMF_string
    break if key.empty? && (type = read__UI8) == 9
    hash[key] = read__AMF_data(type)
  end
  hash
end

read__AMF_object() click to toggle source

# File lib/flv/amf_string_buffer.rb, line 97
def read__AMF_object
  object = Object.new
  while !eof?
    key = read__AMF_string
    break if key.empty? && (type = read__UI8) == 9
    object.instance_variable_set( eval(":@#{key}"), read__AMF_data(type) )
  end
  object
end

read__AMF_string() click to toggle source

# File lib/flv/amf_string_buffer.rb, line 74
def read__AMF_string
  read(read__UI16)
end

read__SI16() click to toggle source

# File lib/flv/amf_string_buffer.rb, line 246
def read__SI16
  read(2).reverse.unpack('s').first.to_i
end

read__STRING(length) click to toggle source

# File lib/flv/amf_string_buffer.rb, line 242
def read__STRING(length)
  read length
end

read__UI16() click to toggle source

# File lib/flv/amf_string_buffer.rb, line 230
def read__UI16
  (readchar << 8) + readchar
end

read__UI24() click to toggle source

# File lib/flv/amf_string_buffer.rb, line 234
def read__UI24
  (readchar << 16) + (readchar << 8) + readchar
end

read__UI32() click to toggle source

# File lib/flv/amf_string_buffer.rb, line 238
def read__UI32
  (readchar << 24) + (readchar << 16) + (readchar << 8) + readchar
end

read__UI8() click to toggle source

FIXME: This methods are copied from flv_stream.rb. Should get in here per include? or something like this.

# File lib/flv/amf_string_buffer.rb, line 226
def read__UI8
  readchar
end

readchar() click to toggle source

# File lib/flv/amf_string_buffer.rb, line 43
def readchar
  read(1).unpack('C').first
end

seek(pos) click to toggle source

# File lib/flv/amf_string_buffer.rb, line 32
def seek(pos)
  @pos = pos
end

to_s() click to toggle source

# File lib/flv/amf_string_buffer.rb, line 58
def to_s
  @buffer
end

write(str) click to toggle source

# File lib/flv/amf_string_buffer.rb, line 47
def write(str)
  if @pos + str.length > @buffer.length
    @buffer << ' ' * (@pos + str.length - @buffer.length)
  end
  @buffer[@pos, str.length] = str
  @pos += str.length
end

write__AMF_array(array) click to toggle source

# File lib/flv/amf_string_buffer.rb, line 203
def write__AMF_array(array)
  write__UI8 10
  write__UI32 array.length
  
  array.each do |value|
    write__AMF_data value
  end
end

write__AMF_boolean(value) click to toggle source

# File lib/flv/amf_string_buffer.rb, line 155
def write__AMF_boolean(value)
  write__UI8 1
  value = value ? 1 : 0
  write [value].pack('C')
end

write__AMF_data(object) click to toggle source

# File lib/flv/amf_string_buffer.rb, line 167
def write__AMF_data(object)
  if object === true || object === false
    write__AMF_boolean object
  elsif object.kind_of? Numeric
    write__AMF_double object
  elsif object.kind_of? Time
    write__AMF_date object
  elsif object.kind_of? Hash
    write__AMF_mixed_array object
  elsif object.kind_of? String
    write__AMF_string object
  elsif object.kind_of? Array
    write__AMF_array object
  else
    write__AMF_object object
  end
end

write__AMF_date(time) click to toggle source

# File lib/flv/amf_string_buffer.rb, line 161
def write__AMF_date(time)
  write__UI8 11
  write [(time.to_f * 1000.0)].pack('G')
  write__SI16( (Time.now.gmtoff / 60).to_i ) 
end

write__AMF_double(value) click to toggle source

# File lib/flv/amf_string_buffer.rb, line 150
def write__AMF_double(value)
  write__UI8 0
  write [value].pack('G')
end

write__AMF_key(key) click to toggle source

# File lib/flv/amf_string_buffer.rb, line 185
def write__AMF_key(key)
  write__UI16 key.length
  write key
end

write__AMF_mixed_array(hash) click to toggle source

# File lib/flv/amf_string_buffer.rb, line 190
def write__AMF_mixed_array(hash)
  write__UI8 8
  write__UI32 hash.length # length will never be read
  
  hash.each_pair do |key, value|
    write__AMF_key key
    write__AMF_data value
  end
  
  write__UI16 0
  write__UI8 9
end

write__AMF_object(object) click to toggle source

# File lib/flv/amf_string_buffer.rb, line 212
def write__AMF_object(object)
  write__UI8 3
  
  object.instance_variables.each do |variable|
    write__AMF_key variable.gsub('@', '')
    write__AMF_data object.instance_variable_get( variable.intern )
  end
  
  write__UI16 0
  write__UI8 9
end

write__AMF_string(str) click to toggle source

# File lib/flv/amf_string_buffer.rb, line 144
def write__AMF_string(str)
  write__UI8 2
  write__UI16 str.length
  write str
end

write__SI16(value) click to toggle source

# File lib/flv/amf_string_buffer.rb, line 269
def write__SI16(value)
  write [(value >> 8) & 0xff].pack('c')
  write [value & 0xff].pack('c')
end

write__STRING(string) click to toggle source

# File lib/flv/amf_string_buffer.rb, line 274
def write__STRING(string)
  write string
end

Also aliased as: <<

write__UI16(value) click to toggle source

# File lib/flv/amf_string_buffer.rb, line 254
def write__UI16(value)
  write [(value >> 8) & 0xff].pack('c')
  write [value & 0xff].pack('c')
end

write__UI24(value) click to toggle source

# File lib/flv/amf_string_buffer.rb, line 259
def write__UI24(value)
  write [value >> 16].pack('c')
  write [(value >> 8) & 0xff].pack('c')
  write [value & 0xff].pack('c')
end

write__UI32(value) click to toggle source

# File lib/flv/amf_string_buffer.rb, line 265
def write__UI32(value)
  write [value].pack('N')
end

write__UI8(value) click to toggle source

# File lib/flv/amf_string_buffer.rb, line 250
def write__UI8(value)
  write [value].pack('C')
end