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# $Id: mysql.rb,v 1.24 2005/02/12 11:37:15 tommy Exp $
#
# Copyright (C) 2003-2005 TOMITA Masahiro
# tommy@tmtm.org
#

class Mysql

  VERSION = "4.0-ruby-0.2.5"

  require "socket"
  require "digest/sha1"

  MAX_PACKET_LENGTH = 256*256*256-1
  MAX_ALLOWED_PACKET = 1024*1024*1024

  MYSQL_UNIX_ADDR = "/tmp/mysql.sock"
  MYSQL_PORT = 3306
  PROTOCOL_VERSION = 10

  # Command
  COM_SLEEP = 0
  COM_QUIT = 1
  COM_INIT_DB = 2
  COM_QUERY = 3
  COM_FIELD_LIST = 4
  COM_CREATE_DB = 5
  COM_DROP_DB = 6
  COM_REFRESH = 7
  COM_SHUTDOWN = 8
  COM_STATISTICS = 9
  COM_PROCESS_INFO = 10
  COM_CONNECT = 11
  COM_PROCESS_KILL = 12
  COM_DEBUG = 13
  COM_PING = 14
  COM_TIME = 15
  COM_DELAYED_INSERT = 16
  COM_CHANGE_USER = 17
  COM_BINLOG_DUMP = 18
  COM_TABLE_DUMP = 19
  COM_CONNECT_OUT = 20
  COM_REGISTER_SLAVE = 21

  # Client flag
  CLIENT_LONG_PASSWORD = 1
  CLIENT_FOUND_ROWS = 1 << 1
  CLIENT_LONG_FLAG = 1 << 2
  CLIENT_CONNECT_WITH_DB= 1 << 3
  CLIENT_NO_SCHEMA = 1 << 4
  CLIENT_COMPRESS = 1 << 5
  CLIENT_ODBC = 1 << 6
  CLIENT_LOCAL_FILES = 1 << 7
  CLIENT_IGNORE_SPACE = 1 << 8
  CLIENT_PROTOCOL_41 = 1 << 9
  CLIENT_INTERACTIVE = 1 << 10
  CLIENT_SSL = 1 << 11
  CLIENT_IGNORE_SIGPIPE = 1 << 12
  CLIENT_TRANSACTIONS = 1 << 13
  CLIENT_RESERVED = 1 << 14
  CLIENT_SECURE_CONNECTION = 1 << 15
  CLIENT_CAPABILITIES = CLIENT_LONG_PASSWORD|CLIENT_LONG_FLAG|CLIENT_TRANSACTIONS
  PROTO_AUTH41 = CLIENT_PROTOCOL_41 | CLIENT_SECURE_CONNECTION

  # Connection Option
  OPT_CONNECT_TIMEOUT = 0
  OPT_COMPRESS = 1
  OPT_NAMED_PIPE = 2
  INIT_COMMAND = 3
  READ_DEFAULT_FILE = 4
  READ_DEFAULT_GROUP = 5
  SET_CHARSET_DIR = 6
  SET_CHARSET_NAME = 7
  OPT_LOCAL_INFILE = 8

  # Server Status
  SERVER_STATUS_IN_TRANS = 1
  SERVER_STATUS_AUTOCOMMIT = 2

  # Refresh parameter
  REFRESH_GRANT = 1
  REFRESH_LOG = 2
  REFRESH_TABLES = 4
  REFRESH_HOSTS = 8
  REFRESH_STATUS = 16
  REFRESH_THREADS = 32
  REFRESH_SLAVE = 64
  REFRESH_MASTER = 128

  def initialize(*args)
    @client_flag = 0
    @max_allowed_packet = MAX_ALLOWED_PACKET
    @query_with_result = true
    @status = :STATUS_READY
    if args[0] != :INIT then
      real_connect(*args)
    end
  end

  def real_connect(host=nil, user=nil, passwd=nil, db=nil, port=nil, socket=nil, flag=nil)
    @server_status = SERVER_STATUS_AUTOCOMMIT
    if (host == nil or host == "localhost") and defined? UNIXSocket then
      unix_socket = socket || ENV["MYSQL_UNIX_PORT"] || MYSQL_UNIX_ADDR
      sock = UNIXSocket::new(unix_socket)
      @host_info = Error::err(Error::CR_LOCALHOST_CONNECTION)
      @unix_socket = unix_socket
    else
      sock = TCPSocket::new(host, port||ENV["MYSQL_TCP_PORT"]||(Socket::getservbyname("mysql","tcp") rescue MYSQL_PORT))
      @host_info = sprintf Error::err(Error::CR_TCP_CONNECTION), host
    end
    @host = host ? host.dup : nil
    sock.setsockopt Socket::SOL_SOCKET, Socket::SO_KEEPALIVE, true
    @net = Net::new sock

    a = read
    @protocol_version = a.slice!(0)
    @server_version, a = a.split(/\0/,2)
    @thread_id, @scramble_buff = a.slice!(0,13).unpack("La8")
    if a.size >= 2 then
      @server_capabilities, = a.slice!(0,2).unpack("v")
    end
    if a.size >= 16 then
      @server_language, @server_status = a.slice!(0,3).unpack("cv")
    end

    flag = 0 if flag == nil
    flag |= @client_flag | CLIENT_CAPABILITIES
    flag |= CLIENT_CONNECT_WITH_DB if db

    @pre_411 = (0 == @server_capabilities & PROTO_AUTH41)
    if @pre_411
      data = Net::int2str(flag)+Net::int3str(@max_allowed_packet)+
             (user||"")+"\0"+
                   scramble(passwd, @scramble_buff, @protocol_version==9)
    else
      dummy, @salt2 = a.unpack("a13a12")
      @scramble_buff += @salt2
      flag |= PROTO_AUTH41
      data = Net::int4str(flag) + Net::int4str(@max_allowed_packet) +
             ([8] + Array.new(23, 0)).pack("c24") + (user||"")+"\0"+
             scramble41(passwd, @scramble_buff)
    end

    if db and @server_capabilities & CLIENT_CONNECT_WITH_DB != 0
      data << "\0" if @pre_411
      data << db
      @db = db.dup
    end
    write data
    read
    ObjectSpace.define_finalizer(self, Mysql.finalizer(@net))
    self
  end
  alias :connect :real_connect

  def escape_string(str)
    Mysql::escape_string str
  end
  alias :quote :escape_string

  def get_client_info()
    VERSION
  end
  alias :client_info :get_client_info

  def options(option, arg=nil)
    if option == OPT_LOCAL_INFILE then
      if arg == false or arg == 0 then
@client_flag &= ~CLIENT_LOCAL_FILES
      else
@client_flag |= CLIENT_LOCAL_FILES
      end
    else
      raise "not implemented"
    end
  end

  def real_query(query)
    command COM_QUERY, query, true
    read_query_result
    self
  end

  def use_result()
    if @status != :STATUS_GET_RESULT then
      error Error::CR_COMMANDS_OUT_OF_SYNC
    end
    res = Result::new self, @fields, @field_count
    @status = :STATUS_USE_RESULT
    res
  end

  def store_result()
    if @status != :STATUS_GET_RESULT then
      error Error::CR_COMMANDS_OUT_OF_SYNC
    end
    @status = :STATUS_READY
    data = read_rows @field_count
    res = Result::new self, @fields, @field_count, data
    @fields = nil
    @affected_rows = data.length
    res
  end

  def change_user(user="", passwd="", db="")
    if @pre_411
      data = user+"\0"+scramble(passwd, @scramble_buff, @protocol_version==9)+"\0"+db
    else
      data = user+"\0"+scramble41(passwd, @scramble_buff)+db
    end
    command COM_CHANGE_USER, data
    @user = user
    @passwd = passwd
    @db = db
  end

  def character_set_name()
    raise "not implemented"
  end

  def close()
    @status = :STATUS_READY
    command COM_QUIT, nil, true
    @net.close
    self
  end

  def create_db(db)
    command COM_CREATE_DB, db
    self
  end

  def drop_db(db)
    command COM_DROP_DB, db
    self
  end

  def dump_debug_info()
    command COM_DEBUG
    self
  end

  def get_host_info()
    @host_info
  end
  alias :host_info :get_host_info

  def get_proto_info()
    @protocol_version
  end
  alias :proto_info :get_proto_info

  def get_server_info()
    @server_version
  end
  alias :server_info :get_server_info

  def kill(id)
    command COM_PROCESS_KILL, Net::int4str(id)
    self
  end

  def list_dbs(db=nil)
    real_query "show databases #{db}"
    @status = :STATUS_READY
    read_rows(1).flatten
  end

  def list_fields(table, field=nil)
    command COM_FIELD_LIST, "#{table}\0#{field}", true
    if @pre_411
      f = read_rows 6
    else
      f = read_rows 7
    end
    fields = unpack_fields(f, @server_capabilities & CLIENT_LONG_FLAG != 0)
    res = Result::new self, fields, f.length
    res.eof = true
    res
  end

  def list_processes()
    data = command COM_PROCESS_INFO
    @field_count = get_length data
    if @pre_411
      fields = read_rows 5
    else
      fields = read_rows 7
    end
    @fields = unpack_fields(fields, @server_capabilities & CLIENT_LONG_FLAG != 0)
    @status = :STATUS_GET_RESULT
    store_result
  end

  def list_tables(table=nil)
    real_query "show tables #{table}"
    @status = :STATUS_READY
    read_rows(1).flatten
  end

  def ping()
    command COM_PING
    self
  end

  def query(query)
    real_query query
    if not @query_with_result then
      return self
    end
    if @field_count == 0 then
      return nil
    end
    store_result
  end

  def refresh(r)
    command COM_REFRESH, r.chr
    self
  end

  def reload()
    refresh REFRESH_GRANT
    self
  end

  def select_db(db)
    command COM_INIT_DB, db
    @db = db
    self
  end

  def shutdown()
    command COM_SHUTDOWN
    self
  end

  def stat()
    command COM_STATISTICS
  end

  attr_reader :info, :insert_id, :affected_rows, :field_count, :thread_id
  attr_accessor :query_with_result, :status

  def read_one_row(field_count)
    data = read
    if data[0] == 254 and data.length == 1 ## EOF
      return
    elsif data[0] == 254 and data.length == 5
      return
    end
    rec = []
    field_count.times do
      len = get_length data
      if len == nil then
rec << len
      else
rec << data.slice!(0,len)
      end
    end
    rec
  end

  def skip_result()
    if @status == :STATUS_USE_RESULT then
      loop do
data = read
break if data[0] == 254 and data.length == 1
      end
      @status = :STATUS_READY
    end
  end

  def inspect()
    "#<#{self.class}>"
  end

  private

  def read_query_result()
    data = read
    @field_count = get_length(data)
    if @field_count == nil then # LOAD DATA LOCAL INFILE
      File::open(data) do |f|
write f.read
      end
      write "" # mark EOF
      data = read
      @field_count = get_length(data)
    end
    if @field_count == 0 then
      @affected_rows = get_length(data, true)
      @insert_id = get_length(data, true)
      if @server_capabilities & CLIENT_TRANSACTIONS != 0 then
a = data.slice!(0,2)
@server_status = a[0]+a[1]*256
      end
      if data.size > 0 and get_length(data) then
@info = data
      end
    else
      @extra_info = get_length(data, true)
      if @pre_411
        fields = read_rows(5)
      else
        fields = read_rows(7)
      end
      @fields = unpack_fields(fields, @server_capabilities & CLIENT_LONG_FLAG != 0)
      @status = :STATUS_GET_RESULT
    end
    self
  end

  def unpack_fields(data, long_flag_protocol)
    ret = []
    data.each do |f|
      if @pre_411
        table = org_table = f[0]
        name = f[1]
        length = f[2][0]+f[2][1]*256+f[2][2]*256*256
        type = f[3][0]
        if long_flag_protocol then
          flags = f[4][0]+f[4][1]*256
          decimals = f[4][2]
        else
          flags = f[4][0]
          decimals = f[4][1]
        end
        def_value = f[5]
        max_length = 0
      else
        catalog = f[0]
        db = f[1]
        table = f[2]
        org_table = f[3]
        name = f[4]
        org_name = f[5]
        length = f[6][2]+f[6][3]*256+f[6][4]*256*256
        type = f[6][6]
        flags = f[6][7]+f[6][8]*256
        decimals = f[6][9]
        def_value = ""
        max_length = 0
      end
      ret << Field::new(table, org_table, name, length, type, flags, decimals, def_value, max_length)
    end
    ret
  end

  def read_rows(field_count)
    ret = []
    while rec = read_one_row(field_count) do
      ret << rec
    end
    ret
  end

  def get_length(data, longlong=nil)
    return if data.length == 0
    c = data.slice!(0)
    case c
    when 251
      return nil
    when 252
      a = data.slice!(0,2)
      return a[0]+a[1]*256
    when 253
      a = data.slice!(0,3)
      return a[0]+a[1]*256+a[2]*256**2
    when 254
      a = data.slice!(0,8)
      if longlong then
return a[0]+a[1]*256+a[2]*256**2+a[3]*256**3+
a[4]*256**4+a[5]*256**5+a[6]*256**6+a[7]*256**7
      else
return a[0]+a[1]*256+a[2]*256**2+a[3]*256**3
      end
    else
      c
    end
  end

  def command(cmd, arg=nil, skip_check=nil)
    unless @net then
      error Error::CR_SERVER_GONE_ERROR
    end
    if @status != :STATUS_READY then
      error Error::CR_COMMANDS_OUT_OF_SYNC
    end
    @net.clear
    write cmd.chr+(arg||"")
    read unless skip_check
  end

  def read()
    unless @net then
      error Error::CR_SERVER_GONE_ERROR
    end
    a = @net.read
    if a[0] == 255 then
      if a.length > 3 then
@errno = a[1]+a[2]*256
@error = a[3 .. -1]
      else
@errno = Error::CR_UNKNOWN_ERROR
@error = Error::err @errno
      end
      raise Error::new(@errno, @error)
    end
    a
  end

  def write(arg)
    unless @net then
      error Error::CR_SERVER_GONE_ERROR
    end
    @net.write arg
  end

  def hash_password(password)
    nr = 1345345333
    add = 7
    nr2 = 0x12345671
    password.each_byte do |i|
      next if i == 0x20 or i == 9
      nr ^= (((nr & 63) + add) * i) + (nr << 8)
      nr2 += (nr2 << 8) ^ nr
      add += i
    end
    [nr & ((1 << 31) - 1), nr2 & ((1 << 31) - 1)]
  end

  def scramble(password, message, old_ver)
    return "" if password == nil or password == ""
    raise "old version password is not implemented" if old_ver
    hash_pass = hash_password password
    hash_message = hash_password message
    rnd = Random::new hash_pass[0] ^ hash_message[0], hash_pass[1] ^ hash_message[1]
    to = []
    1.upto(message.length) do
      to << ((rnd.rnd*31)+64).floor
    end
    extra = (rnd.rnd*31).floor
    to.map! do |t| (t ^ extra).chr end
    to.join
  end

  def scramble41(password, message)
    return 0x00.chr if password.nil? or password.empty?
    buf = [0x14]
    s1 = Digest::SHA1.new(password).digest
    s2 = Digest::SHA1.new(s1).digest
    x = Digest::SHA1.new(message + s2).digest
    (0..s1.length - 1).each {|i| buf.push(s1[i] ^ x[i])}
    buf.pack("C*")
  end

  def error(errno)
    @errno = errno
    @error = Error::err errno
    raise Error::new(@errno, @error)
  end

  class Result
    def initialize(mysql, fields, field_count, data=nil)
      @handle = mysql
      @fields = fields
      @field_count = field_count
      @data = data
      @current_field = 0
      @current_row = 0
      @eof = false
      @row_count = 0
    end
    attr_accessor :eof

    def data_seek(n)
      @current_row = n
    end

    def fetch_field()
      return if @current_field >= @field_count
      f = @fields[@current_field]
      @current_field += 1
      f
    end

    def fetch_fields()
      @fields
    end

    def fetch_field_direct(n)
      @fields[n]
    end

    def fetch_lengths()
      @data ? @data[@current_row].map{|i| i ? i.length : 0} : @lengths
    end

    def fetch_row()
      if @data then
if @current_row >= @data.length then
@handle.status = :STATUS_READY
return
end
ret = @data[@current_row]
@current_row += 1
      else
return if @eof
ret = @handle.read_one_row @field_count
if ret == nil then
@eof = true
return
end
@lengths = ret.map{|i| i ? i.length : 0}
@row_count += 1
      end
      ret
    end

    def fetch_hash(with_table=nil)
      row = fetch_row
      return if row == nil
      hash = {}
      @fields.each_index do |i|
f = with_table ? @fields[i].table+"."+@fields[i].name : @fields[i].name
hash[f] = row[i]
      end
      hash
    end

    def field_seek(n)
      @current_field = n
    end

    def field_tell()
      @current_field
    end

    def free()
      @handle.skip_result
      @handle = @fields = @data = nil
    end

    def num_fields()
      @field_count
    end

    def num_rows()
      @data ? @data.length : @row_count
    end

    def row_seek(n)
      @current_row = n
    end

    def row_tell()
      @current_row
    end

    def each()
      while row = fetch_row do
yield row
      end
    end

    def each_hash(with_table=nil)
      while hash = fetch_hash(with_table) do
yield hash
      end
    end

    def inspect()
      "#<#{self.class}>"
    end

  end

  class Field
    # Field type
    TYPE_DECIMAL = 0
    TYPE_TINY = 1
    TYPE_SHORT = 2
    TYPE_LONG = 3
    TYPE_FLOAT = 4
    TYPE_DOUBLE = 5
    TYPE_NULL = 6
    TYPE_TIMESTAMP = 7
    TYPE_LONGLONG = 8
    TYPE_INT24 = 9
    TYPE_DATE = 10
    TYPE_TIME = 11
    TYPE_DATETIME = 12
    TYPE_YEAR = 13
    TYPE_NEWDATE = 14
    TYPE_ENUM = 247
    TYPE_SET = 248
    TYPE_TINY_BLOB = 249
    TYPE_MEDIUM_BLOB = 250
    TYPE_LONG_BLOB = 251
    TYPE_BLOB = 252
    TYPE_VAR_STRING = 253
    TYPE_STRING = 254
    TYPE_GEOMETRY = 255
    TYPE_CHAR = TYPE_TINY
    TYPE_INTERVAL = TYPE_ENUM

    # Flag
    NOT_NULL_FLAG = 1
    PRI_KEY_FLAG = 2
    UNIQUE_KEY_FLAG = 4
    MULTIPLE_KEY_FLAG = 8
    BLOB_FLAG = 16
    UNSIGNED_FLAG = 32
    ZEROFILL_FLAG = 64
    BINARY_FLAG = 128
    ENUM_FLAG = 256
    AUTO_INCREMENT_FLAG = 512
    TIMESTAMP_FLAG = 1024
    SET_FLAG = 2048
    NUM_FLAG = 32768
    PART_KEY_FLAG = 16384
    GROUP_FLAG = 32768
    UNIQUE_FLAG = 65536

    def initialize(table, org_table, name, length, type, flags, decimals, def_value, max_length)
      @table = table
      @org_table = org_table
      @name = name
      @length = length
      @type = type
      @flags = flags
      @decimals = decimals
      @def = def_value
      @max_length = max_length
      if (type <= TYPE_INT24 and (type != TYPE_TIMESTAMP or length == 14 or length == 8)) or type == TYPE_YEAR then
@flags |= NUM_FLAG
      end
    end
    attr_reader :table, :org_table, :name, :length, :type, :flags, :decimals, :def, :max_length

    def inspect()
      "#<#{self.class}:#{@name}>"
    end
  end

  class Error < StandardError
    # Server Error
    ER_HASHCHK = 1000
    ER_NISAMCHK = 1001
    ER_NO = 1002
    ER_YES = 1003
    ER_CANT_CREATE_FILE = 1004
    ER_CANT_CREATE_TABLE = 1005
    ER_CANT_CREATE_DB = 1006
    ER_DB_CREATE_EXISTS = 1007
    ER_DB_DROP_EXISTS = 1008
    ER_DB_DROP_DELETE = 1009
    ER_DB_DROP_RMDIR = 1010
    ER_CANT_DELETE_FILE = 1011
    ER_CANT_FIND_SYSTEM_REC = 1012
    ER_CANT_GET_STAT = 1013
    ER_CANT_GET_WD = 1014
    ER_CANT_LOCK = 1015
    ER_CANT_OPEN_FILE = 1016
    ER_FILE_NOT_FOUND = 1017
    ER_CANT_READ_DIR = 1018
    ER_CANT_SET_WD = 1019
    ER_CHECKREAD = 1020
    ER_DISK_FULL = 1021
    ER_DUP_KEY = 1022
    ER_ERROR_ON_CLOSE = 1023
    ER_ERROR_ON_READ = 1024
    ER_ERROR_ON_RENAME = 1025
    ER_ERROR_ON_WRITE = 1026
    ER_FILE_USED = 1027
    ER_FILSORT_ABORT = 1028
    ER_FORM_NOT_FOUND = 1029
    ER_GET_ERRNO = 1030
    ER_ILLEGAL_HA = 1031
    ER_KEY_NOT_FOUND = 1032
    ER_NOT_FORM_FILE = 1033
    ER_NOT_KEYFILE = 1034
    ER_OLD_KEYFILE = 1035
    ER_OPEN_AS_READONLY = 1036
    ER_OUTOFMEMORY = 1037
    ER_OUT_OF_SORTMEMORY = 1038
    ER_UNEXPECTED_EOF = 1039
    ER_CON_COUNT_ERROR = 1040
    ER_OUT_OF_RESOURCES = 1041
    ER_BAD_HOST_ERROR = 1042
    ER_HANDSHAKE_ERROR = 1043
    ER_DBACCESS_DENIED_ERROR = 1044
    ER_ACCESS_DENIED_ERROR = 1045
    ER_NO_DB_ERROR = 1046
    ER_UNKNOWN_COM_ERROR = 1047
    ER_BAD_NULL_ERROR = 1048
    ER_BAD_DB_ERROR = 1049
    ER_TABLE_EXISTS_ERROR = 1050
    ER_BAD_TABLE_ERROR = 1051
    ER_NON_UNIQ_ERROR = 1052
    ER_SERVER_SHUTDOWN = 1053
    ER_BAD_FIELD_ERROR = 1054
    ER_WRONG_FIELD_WITH_GROUP = 1055
    ER_WRONG_GROUP_FIELD = 1056
    ER_WRONG_SUM_SELECT = 1057
    ER_WRONG_VALUE_COUNT = 1058
    ER_TOO_LONG_IDENT = 1059
    ER_DUP_FIELDNAME = 1060
    ER_DUP_KEYNAME = 1061
    ER_DUP_ENTRY = 1062
    ER_WRONG_FIELD_SPEC = 1063
    ER_PARSE_ERROR = 1064
    ER_EMPTY_QUERY = 1065
    ER_NONUNIQ_TABLE = 1066
    ER_INVALID_DEFAULT = 1067
    ER_MULTIPLE_PRI_KEY = 1068
    ER_TOO_MANY_KEYS = 1069
    ER_TOO_MANY_KEY_PARTS = 1070
    ER_TOO_LONG_KEY = 1071
    ER_KEY_COLUMN_DOES_NOT_EXITS = 1072
    ER_BLOB_USED_AS_KEY = 1073
    ER_TOO_BIG_FIELDLENGTH = 1074
    ER_WRONG_AUTO_KEY = 1075
    ER_READY = 1076
    ER_NORMAL_SHUTDOWN = 1077
    ER_GOT_SIGNAL = 1078
    ER_SHUTDOWN_COMPLETE = 1079
    ER_FORCING_CLOSE = 1080
    ER_IPSOCK_ERROR = 1081
    ER_NO_SUCH_INDEX = 1082
    ER_WRONG_FIELD_TERMINATORS = 1083
    ER_BLOBS_AND_NO_TERMINATED = 1084
    ER_TEXTFILE_NOT_READABLE = 1085
    ER_FILE_EXISTS_ERROR = 1086
    ER_LOAD_INFO = 1087
    ER_ALTER_INFO = 1088
    ER_WRONG_SUB_KEY = 1089
    ER_CANT_REMOVE_ALL_FIELDS = 1090
    ER_CANT_DROP_FIELD_OR_KEY = 1091
    ER_INSERT_INFO = 1092
    ER_INSERT_TABLE_USED = 1093
    ER_NO_SUCH_THREAD = 1094
    ER_KILL_DENIED_ERROR = 1095
    ER_NO_TABLES_USED = 1096
    ER_TOO_BIG_SET = 1097
    ER_NO_UNIQUE_LOGFILE = 1098
    ER_TABLE_NOT_LOCKED_FOR_WRITE = 1099
    ER_TABLE_NOT_LOCKED = 1100
    ER_BLOB_CANT_HAVE_DEFAULT = 1101
    ER_WRONG_DB_NAME = 1102
    ER_WRONG_TABLE_NAME = 1103
    ER_TOO_BIG_SELECT = 1104
    ER_UNKNOWN_ERROR = 1105
    ER_UNKNOWN_PROCEDURE = 1106
    ER_WRONG_PARAMCOUNT_TO_PROCEDURE = 1107
    ER_WRONG_PARAMETERS_TO_PROCEDURE = 1108
    ER_UNKNOWN_TABLE = 1109
    ER_FIELD_SPECIFIED_TWICE = 1110
    ER_INVALID_GROUP_FUNC_USE = 1111
    ER_UNSUPPORTED_EXTENSION = 1112
    ER_TABLE_MUST_HAVE_COLUMNS = 1113
    ER_RECORD_FILE_FULL = 1114
    ER_UNKNOWN_CHARACTER_SET = 1115
    ER_TOO_MANY_TABLES = 1116
    ER_TOO_MANY_FIELDS = 1117
    ER_TOO_BIG_ROWSIZE = 1118
    ER_STACK_OVERRUN = 1119
    ER_WRONG_OUTER_JOIN = 1120
    ER_NULL_COLUMN_IN_INDEX = 1121
    ER_CANT_FIND_UDF = 1122
    ER_CANT_INITIALIZE_UDF = 1123
    ER_UDF_NO_PATHS = 1124
    ER_UDF_EXISTS = 1125
    ER_CANT_OPEN_LIBRARY = 1126
    ER_CANT_FIND_DL_ENTRY = 1127
    ER_FUNCTION_NOT_DEFINED = 1128
    ER_HOST_IS_BLOCKED = 1129
    ER_HOST_NOT_PRIVILEGED = 1130
    ER_PASSWORD_ANONYMOUS_USER = 1131
    ER_PASSWORD_NOT_ALLOWED = 1132
    ER_PASSWORD_NO_MATCH = 1133
    ER_UPDATE_INFO = 1134
    ER_CANT_CREATE_THREAD = 1135
    ER_WRONG_VALUE_COUNT_ON_ROW = 1136
    ER_CANT_REOPEN_TABLE = 1137
    ER_INVALID_USE_OF_NULL = 1138
    ER_REGEXP_ERROR = 1139
    ER_MIX_OF_GROUP_FUNC_AND_FIELDS = 1140
    ER_NONEXISTING_GRANT = 1141
    ER_TABLEACCESS_DENIED_ERROR = 1142
    ER_COLUMNACCESS_DENIED_ERROR = 1143
    ER_ILLEGAL_GRANT_FOR_TABLE = 1144
    ER_GRANT_WRONG_HOST_OR_USER = 1145
    ER_NO_SUCH_TABLE = 1146
    ER_NONEXISTING_TABLE_GRANT = 1147
    ER_NOT_ALLOWED_COMMAND = 1148
    ER_SYNTAX_ERROR = 1149
    ER_DELAYED_CANT_CHANGE_LOCK = 1150
    ER_TOO_MANY_DELAYED_THREADS = 1151
    ER_ABORTING_CONNECTION = 1152
    ER_NET_PACKET_TOO_LARGE = 1153
    ER_NET_READ_ERROR_FROM_PIPE = 1154
    ER_NET_FCNTL_ERROR = 1155
    ER_NET_PACKETS_OUT_OF_ORDER = 1156
    ER_NET_UNCOMPRESS_ERROR = 1157
    ER_NET_READ_ERROR = 1158
    ER_NET_READ_INTERRUPTED = 1159
    ER_NET_ERROR_ON_WRITE = 1160
    ER_NET_WRITE_INTERRUPTED = 1161
    ER_TOO_LONG_STRING = 1162
    ER_TABLE_CANT_HANDLE_BLOB = 1163
    ER_TABLE_CANT_HANDLE_AUTO_INCREMENT = 1164
    ER_DELAYED_INSERT_TABLE_LOCKED = 1165
    ER_WRONG_COLUMN_NAME = 1166
    ER_WRONG_KEY_COLUMN = 1167
    ER_WRONG_MRG_TABLE = 1168
    ER_DUP_UNIQUE = 1169
    ER_BLOB_KEY_WITHOUT_LENGTH = 1170
    ER_PRIMARY_CANT_HAVE_NULL = 1171
    ER_TOO_MANY_ROWS = 1172
    ER_REQUIRES_PRIMARY_KEY = 1173
    ER_NO_RAID_COMPILED = 1174
    ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE = 1175
    ER_KEY_DOES_NOT_EXITS = 1176
    ER_CHECK_NO_SUCH_TABLE = 1177
    ER_CHECK_NOT_IMPLEMENTED = 1178
    ER_CANT_DO_THIS_DURING_AN_TRANSACTION = 1179
    ER_ERROR_DURING_COMMIT = 1180
    ER_ERROR_DURING_ROLLBACK = 1181
    ER_ERROR_DURING_FLUSH_LOGS = 1182
    ER_ERROR_DURING_CHECKPOINT = 1183
    ER_NEW_ABORTING_CONNECTION = 1184
    ER_DUMP_NOT_IMPLEMENTED = 1185
    ER_FLUSH_MASTER_BINLOG_CLOSED = 1186
    ER_INDEX_REBUILD = 1187
    ER_MASTER = 1188
    ER_MASTER_NET_READ = 1189
    ER_MASTER_NET_WRITE = 1190
    ER_FT_MATCHING_KEY_NOT_FOUND = 1191
    ER_LOCK_OR_ACTIVE_TRANSACTION = 1192
    ER_UNKNOWN_SYSTEM_VARIABLE = 1193
    ER_CRASHED_ON_USAGE = 1194
    ER_CRASHED_ON_REPAIR = 1195
    ER_WARNING_NOT_COMPLETE_ROLLBACK = 1196
    ER_TRANS_CACHE_FULL = 1197
    ER_SLAVE_MUST_STOP = 1198
    ER_SLAVE_NOT_RUNNING = 1199
    ER_BAD_SLAVE = 1200
    ER_MASTER_INFO = 1201
    ER_SLAVE_THREAD = 1202
    ER_TOO_MANY_USER_CONNECTIONS = 1203
    ER_SET_CONSTANTS_ONLY = 1204
    ER_LOCK_WAIT_TIMEOUT = 1205
    ER_LOCK_TABLE_FULL = 1206
    ER_READ_ONLY_TRANSACTION = 1207
    ER_DROP_DB_WITH_READ_LOCK = 1208
    ER_CREATE_DB_WITH_READ_LOCK = 1209
    ER_WRONG_ARGUMENTS = 1210
    ER_NO_PERMISSION_TO_CREATE_USER = 1211
    ER_UNION_TABLES_IN_DIFFERENT_DIR = 1212
    ER_LOCK_DEADLOCK = 1213
    ER_TABLE_CANT_HANDLE_FULLTEXT = 1214
    ER_CANNOT_ADD_FOREIGN = 1215
    ER_NO_REFERENCED_ROW = 1216
    ER_ROW_IS_REFERENCED = 1217
    ER_CONNECT_TO_MASTER = 1218
    ER_QUERY_ON_MASTER = 1219
    ER_ERROR_WHEN_EXECUTING_COMMAND = 1220
    ER_WRONG_USAGE = 1221
    ER_WRONG_NUMBER_OF_COLUMNS_IN_SELECT = 1222
    ER_CANT_UPDATE_WITH_READLOCK = 1223
    ER_MIXING_NOT_ALLOWED = 1224
    ER_DUP_ARGUMENT = 1225
    ER_USER_LIMIT_REACHED = 1226
    ER_SPECIFIC_ACCESS_DENIED_ERROR = 1227
    ER_LOCAL_VARIABLE = 1228
    ER_GLOBAL_VARIABLE = 1229
    ER_NO_DEFAULT = 1230
    ER_WRONG_VALUE_FOR_VAR = 1231
    ER_WRONG_TYPE_FOR_VAR = 1232
    ER_VAR_CANT_BE_READ = 1233
    ER_CANT_USE_OPTION_HERE = 1234
    ER_NOT_SUPPORTED_YET = 1235
    ER_MASTER_FATAL_ERROR_READING_BINLOG = 1236
    ER_SLAVE_IGNORED_TABLE = 1237
    ER_ERROR_MESSAGES = 238

    # Client Error
    CR_MIN_ERROR = 2000
    CR_MAX_ERROR = 2999
    CR_UNKNOWN_ERROR = 2000
    CR_SOCKET_CREATE_ERROR = 2001
    CR_CONNECTION_ERROR = 2002
    CR_CONN_HOST_ERROR = 2003
    CR_IPSOCK_ERROR = 2004
    CR_UNKNOWN_HOST = 2005
    CR_SERVER_GONE_ERROR = 2006
    CR_VERSION_ERROR = 2007
    CR_OUT_OF_MEMORY = 2008
    CR_WRONG_HOST_INFO = 2009
    CR_LOCALHOST_CONNECTION = 2010
    CR_TCP_CONNECTION = 2011
    CR_SERVER_HANDSHAKE_ERR = 2012
    CR_SERVER_LOST = 2013
    CR_COMMANDS_OUT_OF_SYNC = 2014
    CR_NAMEDPIPE_CONNECTION = 2015
    CR_NAMEDPIPEWAIT_ERROR = 2016
    CR_NAMEDPIPEOPEN_ERROR = 2017
    CR_NAMEDPIPESETSTATE_ERROR = 2018
    CR_CANT_READ_CHARSET = 2019
    CR_NET_PACKET_TOO_LARGE = 2020
    CR_EMBEDDED_CONNECTION = 2021
    CR_PROBE_SLAVE_STATUS = 2022
    CR_PROBE_SLAVE_HOSTS = 2023
    CR_PROBE_SLAVE_CONNECT = 2024
    CR_PROBE_MASTER_CONNECT = 2025
    CR_SSL_CONNECTION_ERROR = 2026
    CR_MALFORMED_PACKET = 2027

    CLIENT_ERRORS = [
      "Unknown MySQL error",
      "Can't create UNIX socket (%d)",
      "Can't connect to local MySQL server through socket '%-.64s' (%d)",
      "Can't connect to MySQL server on '%-.64s' (%d)",
      "Can't create TCP/IP socket (%d)",
      "Unknown MySQL Server Host '%-.64s' (%d)",
      "MySQL server has gone away",
      "Protocol mismatch. Server Version = %d Client Version = %d",
      "MySQL client run out of memory",
      "Wrong host info",
      "Localhost via UNIX socket",
      "%-.64s via TCP/IP",
      "Error in server handshake",
      "Lost connection to MySQL server during query",
      "Commands out of sync; You can't run this command now",
      "%-.64s via named pipe",
      "Can't wait for named pipe to host: %-.64s pipe: %-.32s (%lu)",
      "Can't open named pipe to host: %-.64s pipe: %-.32s (%lu)",
      "Can't set state of named pipe to host: %-.64s pipe: %-.32s (%lu)",
      "Can't initialize character set %-.64s (path: %-.64s)",
      "Got packet bigger than 'max_allowed_packet'",
      "Embedded server",
      "Error on SHOW SLAVE STATUS:",
      "Error on SHOW SLAVE HOSTS:",
      "Error connecting to slave:",
      "Error connecting to master:",
      "SSL connection error",
      "Malformed packet"
    ]

    def initialize(errno, error)
      @errno = errno
      @error = error
      super error
    end
    attr_reader :errno, :error

    def Error::err(errno)
      CLIENT_ERRORS[errno - Error::CR_MIN_ERROR]
    end
  end

  class Net
    def initialize(sock)
      @sock = sock
      @pkt_nr = 0
    end

    def clear()
      @pkt_nr = 0
    end

    def read()
      buf = []
      len = nil
      @sock.sync = false
      while len == nil or len == MAX_PACKET_LENGTH do
a = @sock.read(4)
len = a[0]+a[1]*256+a[2]*256*256
pkt_nr = a[3]
if @pkt_nr != pkt_nr then
raise "Packets out of order: #{@pkt_nr}<>#{pkt_nr}"
end
@pkt_nr = @pkt_nr + 1 & 0xff
buf << @sock.read(len)
      end
      @sock.sync = true
      buf.join
    rescue
      errno = Error::CR_SERVER_LOST
      raise Error::new(errno, Error::err(errno))
    end
    
    def write(data)
      if data.is_a? Array then
data = data.join
      end
      @sock.sync = false
      ptr = 0
      while data.length >= MAX_PACKET_LENGTH do
@sock.write Net::int3str(MAX_PACKET_LENGTH)+@pkt_nr.chr+data[ptr, MAX_PACKET_LENGTH]
@pkt_nr = @pkt_nr + 1 & 0xff
ptr += MAX_PACKET_LENGTH
      end
      @sock.write Net::int3str(data.length-ptr)+@pkt_nr.chr+data[ptr .. -1]
      @pkt_nr = @pkt_nr + 1 & 0xff
      @sock.sync = true
      @sock.flush
    rescue
      errno = Error::CR_SERVER_LOST
      raise Error::new(errno, Error::err(errno))
    end

    def close()
      @sock.close
    end

    def Net::int2str(n)
      [n].pack("v")
    end

    def Net::int3str(n)
      [n%256, n>>8].pack("cv")
    end

    def Net::int4str(n)
      [n].pack("V")
    end

  end

  class Random
    def initialize(seed1, seed2)
      @max_value = 0x3FFFFFFF
      @seed1 = seed1 % @max_value
      @seed2 = seed2 % @max_value
    end

    def rnd()
      @seed1 = (@seed1*3+@seed2) % @max_value
      @seed2 = (@seed1+@seed2+33) % @max_value
      @seed1.to_f / @max_value
    end
  end

end

class << Mysql
  def init()
    Mysql::new :INIT
  end

  def real_connect(*args)
    Mysql::new(*args)
  end
  alias :connect :real_connect

  def finalizer(net)
    proc {
      net.clear
      net.write Mysql::COM_QUIT.chr
    }
  end

  def escape_string(str)
    str.gsub(/([\0\n\r\032\'\"\\])/) do
      case $1
      when "\0" then "\\0"
      when "\n" then "\\n"
      when "\r" then "\\r"
      when "\032" then "\\Z"
      else "\\"+$1
      end
    end
  end
  alias :quote :escape_string

  def get_client_info()
    Mysql::VERSION
  end
  alias :client_info :get_client_info

  def debug(str)
    raise "not implemented"
  end
end

#
# for compatibility
#

MysqlRes = Mysql::Result
MysqlField = Mysql::Field
MysqlError = Mysql::Error
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