Changed layout to support tagging and branching

3 files changed, 736 insertions, 0 deletions

diff --git a/lib/sqlite3/driver/dl/api.rb b/lib/sqlite3/driver/dl/api.rb
new file mode 100644
index 0000000..f892013
--- /dev/null
+++ b/lib/sqlite3/driver/dl/api.rb
@@ -0,0 +1,184 @@
+#--
+# =============================================================================
+# Copyright (c) 2004, Jamis Buck (jgb3@email.byu.edu)
+# All rights reserved.
+# 
+# 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 names of its contributors may not be used to endorse or promote
+#       products derived from this software without specific prior written
+#       permission.
+# 
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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.
+# =============================================================================
+#++
+
+require 'dl/import'
+
+module SQLite3 ; module Driver; module DL;
+
+  module API
+    extend ::DL::Importable
+
+    library_name = case RUBY_PLATFORM.downcase
+      when /darwin/
+        "libsqlite3.dylib"
+      when /linux/
+        "libsqlite3.so"
+      when /win32/
+        "sqlite3.dll"
+      else
+        abort <<-EOF
+== * UNSUPPORTED PLATFORM ======================================================
+The platform '#{RUBY_PLATFORM}' is unsupported. Please help the author by
+editing the following file to allow your sqlite3 library to be found, and
+submitting a patch to jamis_buck@byu.edu. Thanks!
+
+#{__FILE__}
+=========================================================================== * ==
+        EOF
+    end
+
+    if defined? SQLITE3_LIB_PATH
+      library_name = File.join( SQLITE3_LIB_PATH, library_name )
+    end
+
+    dlload library_name
+
+    typealias "db",      "void*"
+    typealias "stmt",    "void*"
+    typealias "value",   "void*"
+    typealias "context", "void*"
+
+    # until Ruby/DL supports 64-bit ints, we'll just treat them as 32-bit ints
+    typealias "int64", "unsigned long"
+
+    extern "const char *sqlite3_libversion()"
+
+    extern "int sqlite3_open(const char*,db*)"
+    extern "int sqlite3_open16(const void*,db*)"
+    extern "int sqlite3_close(db)"
+    extern "const char* sqlite3_errmsg(db)"
+    extern "void* sqlite3_errmsg16(db)"
+    extern "int sqlite3_errcode(db)"
+
+    extern "int sqlite3_prepare(db,const char*,int,stmt*,const char**)"
+    extern "int sqlite3_prepare16(db,const void*,int,stmt*,const void**)"
+    extern "int sqlite3_finalize(stmt)"
+    extern "int sqlite3_reset(stmt)"
+    extern "int sqlite3_step(stmt)"
+
+    extern "int64 sqlite3_last_insert_rowid(db)"
+    extern "int sqlite3_changes(db)"
+    extern "int sqlite3_total_changes(db)"
+    extern "void sqlite3_interrupt(db)"
+    extern "ibool sqlite3_complete(const char*)"
+    extern "ibool sqlite3_complete16(const void*)"
+
+    extern "int sqlite3_busy_handler(db,void*,void*)"
+    extern "int sqlite3_busy_timeout(db,int)"
+
+    extern "int sqlite3_set_authorizer(db,void*,void*)"
+    extern "void* sqlite3_trace(db,void*,void*)"
+
+    extern "int sqlite3_bind_blob(stmt,int,const void*,int,void*)"
+    extern "int sqlite3_bind_double(stmt,int,double)"
+    extern "int sqlite3_bind_int(stmt,int,int)"
+    extern "int sqlite3_bind_int64(stmt,int,int64)"
+    extern "int sqlite3_bind_null(stmt,int)"
+    extern "int sqlite3_bind_text(stmt,int,const char*,int,void*)"
+    extern "int sqlite3_bind_text16(stmt,int,const void*,int,void*)"
+    #extern "int sqlite3_bind_value(stmt,int,value)"
+
+    extern "int sqlite3_bind_parameter_count(stmt)"
+    extern "const char* sqlite3_bind_parameter_name(stmt,int)"
+    extern "int sqlite3_bind_parameter_index(stmt,const char*)"
+
+    extern "int sqlite3_column_count(stmt)"
+    extern "int sqlite3_data_count(stmt)"
+
+    extern "const void *sqlite3_column_blob(stmt,int)"
+    extern "int sqlite3_column_bytes(stmt,int)"
+    extern "int sqlite3_column_bytes16(stmt,int)"
+    extern "const char *sqlite3_column_decltype(stmt,int)"
+    extern "void *sqlite3_column_decltype16(stmt,int)"
+    extern "double sqlite3_column_double(stmt,int)"
+    extern "int sqlite3_column_int(stmt,int)"
+    extern "int64 sqlite3_column_int64(stmt,int)"
+    extern "const char *sqlite3_column_name(stmt,int)"
+    extern "const void *sqlite3_column_name16(stmt,int)"
+    extern "const char *sqlite3_column_text(stmt,int)"
+    extern "const void *sqlite3_column_text16(stmt,int)"
+    extern "int sqlite3_column_type(stmt,int)"
+
+    extern "int sqlite3_create_function(db,const char*,int,int,void*,void*,void*,void*)"
+    extern "int sqlite3_create_function16(db,const void*,int,int,void*,void*,void*,void*)"
+    extern "int sqlite3_aggregate_count(context)"
+
+    extern "const void *sqlite3_value_blob(value)"
+    extern "int sqlite3_value_bytes(value)"
+    extern "int sqlite3_value_bytes16(value)"
+    extern "double sqlite3_value_double(value)"
+    extern "int sqlite3_value_int(value)"
+    extern "int64 sqlite3_value_int64(value)"
+    extern "const char* sqlite3_value_text(value)"
+    extern "const void* sqlite3_value_text16(value)"
+    extern "const void* sqlite3_value_text16le(value)"
+    extern "const void* sqlite3_value_text16be(value)"
+    extern "int sqlite3_value_type(value)"
+
+    extern "void *sqlite3_aggregate_context(context,int)"
+    extern "void *sqlite3_user_data(context)"
+    extern "void *sqlite3_get_auxdata(context,int)"
+    extern "void sqlite3_set_auxdata(context,int,void*,void*)"
+
+    extern "void sqlite3_result_blob(context,const void*,int,void*)"
+    extern "void sqlite3_result_double(context,double)"
+    extern "void sqlite3_result_error(context,const char*,int)"
+    extern "void sqlite3_result_error16(context,const void*,int)"
+    extern "void sqlite3_result_int(context,int)"
+    extern "void sqlite3_result_int64(context,int64)"
+    extern "void sqlite3_result_null(context)"
+    extern "void sqlite3_result_text(context,const char*,int,void*)"
+    extern "void sqlite3_result_text16(context,const void*,int,void*)"
+    extern "void sqlite3_result_text16le(context,const void*,int,void*)"
+    extern "void sqlite3_result_text16be(context,const void*,int,void*)"
+    extern "void sqlite3_result_value(context,value)"
+
+    extern "int sqlite3_create_collation(db,const char*,int,void*,void*)"
+    extern "int sqlite3_create_collation16(db,const char*,int,void*,void*)"
+    extern "int sqlite3_collation_needed(db,void*,void*)"
+    extern "int sqlite3_collation_needed16(db,void*,void*)"
+
+    # ==== CRYPTO (NOT IN PUBLIC RELEASE) ====
+    if defined?( CRYPTO_API ) && CRYPTO_API
+      extern "int sqlite3_key(db,void*,int)"
+      extern "int sqlite3_rekey(db,void*,int)"
+    end
+
+    # ==== EXPERIMENTAL ====
+    if defined?( EXPERIMENTAL_API ) && EXPERIMENTAL_API
+      extern "int sqlite3_progress_handler(db,int,void*,void*)"
+      extern "int sqlite3_commit_hook(db,void*,void*)"
+    end
+
+  end
+
+end ; end ; end
diff --git a/lib/sqlite3/driver/dl/driver.rb b/lib/sqlite3/driver/dl/driver.rb
new file mode 100644
index 0000000..ab24a13
--- /dev/null
+++ b/lib/sqlite3/driver/dl/driver.rb
@@ -0,0 +1,334 @@
+#--
+# =============================================================================
+# Copyright (c) 2004, Jamis Buck (jgb3@email.byu.edu)
+# All rights reserved.
+# 
+# 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 names of its contributors may not be used to endorse or promote
+#       products derived from this software without specific prior written
+#       permission.
+# 
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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.
+# =============================================================================
+#++
+
+require 'sqlite3/driver/dl/api'
+
+module Kernel
+  # Allows arbitrary objects to be passed as a pointer to functions.
+  # (Probably not very GC safe, but by encapsulating it like this we
+  # can change the implementation later.)
+  def to_ptr
+    ptr = DL.malloc(DL.sizeof("L"))
+    ptr.set_object self
+    ptr
+  end
+end
+
+class DL::PtrData
+  # The inverse of the Kernel#to_ptr operation.
+  def to_object
+    n = to_s(4).unpack("L").first
+    return nil if n < 1
+    ObjectSpace._id2ref(n) rescue self.to_s
+  end
+
+  def set_object(obj)
+    self[0] = [obj.object_id].pack("L")
+  end
+end
+
+module SQLite3 ; module Driver ; module DL
+
+  class Driver
+    STATIC = ::DL::PtrData.new(0)
+    TRANSIENT = ::DL::PtrData.new(-1)
+
+    def open( filename, utf16=false )
+      handle = ::DL::PtrData.new(0)
+      result = API.send( ( utf16 ? :sqlite3_open16 : :sqlite3_open ),
+        filename+"\0", handle.ref )
+      [ result, handle ]
+    end
+
+    def errmsg( db, utf16=false )
+      if utf16
+        msg = API.sqlite3_errmsg16( db )
+        msg.free = nil
+        msg.to_s(utf16_length(msg))
+      else
+        API.sqlite3_errmsg( db )
+      end
+    end
+
+    def prepare( db, sql, utf16=false )
+      handle = ::DL::PtrData.new(0)
+      remainder = ::DL::PtrData.new(0)
+
+      result = API.send( ( utf16 ? :sqlite3_prepare16 : :sqlite3_prepare ),
+         db, sql+"\0", sql.length, handle.ref, remainder.ref )
+
+      args = utf16 ? [ utf16_length(remainder) ] : []
+      remainder = remainder.to_s( *args )
+
+      [ result, handle, remainder ]
+    end
+
+    def complete?( sql, utf16=false )
+      API.send( utf16 ? :sqlite3_complete16 : :sqlite3_complete, sql+"\0" )
+    end
+
+    def value_blob( value )
+      blob = API.sqlite3_value_blob( value )
+      blob.free = nil
+      blob.to_s( API.sqlite3_value_bytes( value ) )
+    end
+
+    def value_text( value, utf16=false )
+      method = case utf16
+        when nil, false then :sqlite3_value_text
+        when :le then :sqlite3_value_text16le
+        when :be then :sqlite3_value_text16be
+        else :sqlite3_value_text16
+      end
+
+      result = API.send( method, value )
+      if utf16
+        result.free = nil
+        size = API.sqlite3_value_bytes( value )
+        result = result.to_s( size )
+      end
+
+      result
+    end
+
+    def column_blob( stmt, column )
+      blob = API.sqlite3_column_blob( stmt, column )
+      blob.free = nil
+      blob.to_s( API.sqlite3_column_bytes( stmt, column ) )
+    end
+
+    def result_text( func, text, utf16=false )
+      method = case utf16
+        when false, nil then :sqlite3_result_text
+        when :le then :sqlite3_result_text16le
+        when :be then :sqlite3_result_text16be
+        else :sqlite3_result_text16
+      end
+
+      s = text.to_s
+      API.send( method, func, s, s.length, TRANSIENT )
+    end
+
+    def busy_handler( db, data=nil, &block )
+      @busy_handler = block
+
+      unless @busy_handler_callback
+        @busy_handler_callback = ::DL.callback( "IPI" ) do |cookie, timeout|
+          @busy_handler.call( cookie, timeout ) || 0
+        end
+      end
+
+      API.sqlite3_busy_handler( db, block&&@busy_handler_callback, data )
+    end
+
+    def set_authorizer( db, data=nil, &block )
+      @authorizer_handler = block
+
+      unless @authorizer_handler_callback
+        @authorizer_handler_callback = ::DL.callback( "IPIPPPP"
+        ) do |cookie,mode,a,b,c,d|
+          @authorizer_handler.call( cookie, mode,
+            a&&a.to_s, b&&b.to_s, c&&c.to_s, d&&d.to_s ) || 0
+        end
+      end
+
+      API.sqlite3_set_authorizer( db, block&&@authorizer_handler_callback,
+        data )
+    end
+
+    def trace( db, data=nil, &block )
+      @trace_handler = block
+
+      unless @trace_handler_callback
+        @trace_handler_callback = ::DL.callback( "IPS" ) do |cookie,sql|
+          @trace_handler.call( cookie ? cookie.to_object : nil, sql ) || 0
+        end
+      end
+
+      API.sqlite3_trace( db, block&&@trace_handler_callback, data )
+    end
+
+    def create_function( db, name, args, text, cookie,
+      func, step, final )
+    # begin
+      if @func_handler_callback.nil? && func
+        @func_handler_callback = ::DL.callback( "0PIP" ) do |context,nargs,args|
+          args = args.to_s(nargs*4).unpack("L*").map {|i| ::DL::PtrData.new(i)}
+          data = API.sqlite3_user_data( context ).to_object
+          data[:func].call( context, *args )
+        end
+      end
+
+      if @step_handler_callback.nil? && step
+        @step_handler_callback = ::DL.callback( "0PIP" ) do |context,nargs,args|
+          args = args.to_s(nargs*4).unpack("L*").map {|i| ::DL::PtrData.new(i)}
+          data = API.sqlite3_user_data( context ).to_object
+          data[:step].call( context, *args )
+        end
+      end
+
+      if @final_handler_callback.nil? && final
+        @final_handler_callback = ::DL.callback( "0P" ) do |context|
+          data = API.sqlite3_user_data( context ).to_object
+          data[:final].call( context )
+        end
+      end
+
+      data = { :cookie => cookie,
+               :name => name,
+               :func => func,
+               :step => step,
+               :final => final }
+
+      API.sqlite3_create_function( db, name, args, text, data,
+        ( func ? @func_handler_callback : nil ),
+        ( step ? @step_handler_callback : nil ),
+        ( final ? @final_handler_callback : nil ) )
+    end
+
+    def aggregate_context( context )
+      ptr = API.sqlite3_aggregate_context( context, 4 )
+      ptr.free = nil
+      obj = ( ptr ? ptr.to_object : nil )
+      if obj.nil?
+        obj = Hash.new
+        ptr.set_object obj
+      end
+      obj
+    end
+
+    def bind_blob( stmt, index, value )
+      s = value.to_s
+      API.sqlite3_bind_blob( stmt, index, s, s.length, TRANSIENT )
+    end
+
+    def bind_text( stmt, index, value, utf16=false )
+      s = value.to_s
+      method = ( utf16 ? :sqlite3_bind_text16 : :sqlite3_bind_text )
+      API.send( method, stmt, index, s, s.length, TRANSIENT )
+    end
+
+    def column_text( stmt, column )
+      result = API.sqlite3_column_text( stmt, column )
+      result ? result.to_s : nil
+    end
+
+    def column_name( stmt, column )
+      result = API.sqlite3_column_name( stmt, column )
+      result ? result.to_s : nil
+    end
+
+    def column_decltype( stmt, column )
+      result = API.sqlite3_column_decltype( stmt, column )
+      result ? result.to_s : nil
+    end
+
+    def self.api_delegate( name )
+      define_method( name ) { |*args| API.send( "sqlite3_#{name}", *args ) }
+    end
+
+    api_delegate :aggregate_count
+    api_delegate :bind_double
+    api_delegate :bind_int
+    api_delegate :bind_null
+    api_delegate :bind_parameter_index
+    api_delegate :bind_parameter_name
+    api_delegate :busy_timeout
+    api_delegate :changes
+    api_delegate :close
+    api_delegate :column_bytes
+    api_delegate :column_bytes16
+    api_delegate :column_count
+    api_delegate :column_double
+    api_delegate :column_int
+    api_delegate :column_int64
+    api_delegate :column_type
+    api_delegate :data_count
+    api_delegate :errcode
+    api_delegate :finalize
+    api_delegate :interrupt
+    api_delegate :last_insert_rowid
+    api_delegate :libversion
+    api_delegate :reset
+    api_delegate :result_error
+    api_delegate :step
+    api_delegate :total_changes
+    api_delegate :value_bytes
+    api_delegate :value_bytes16
+    api_delegate :value_double
+    api_delegate :value_int
+    api_delegate :value_int64
+    api_delegate :value_type
+
+    # ==== EXPERIMENTAL ====
+    if defined?( EXPERIMENTAL_API ) && EXPERIMENTAL_API
+      def progress_handler( db, n, data=nil, &block )
+        @progress_handler = block
+
+        unless @progress_handler_callback
+          @progress_handler_callback = ::DL.callback( "IP" ) do |cookie|
+            @progress_handler.call( cookie )
+          end
+        end
+
+        API.sqlite3_progress_handler( db, n, block&&@progress_handler_callback,
+          data )
+      end
+
+      def commit_hook( db, data=nil, &block )
+        @commit_hook_handler = block
+
+        unless @commit_hook_handler_callback
+          @commit_hook_handler_callback = ::DL.callback( "IP" ) do |cookie|
+            @commit_hook_handler.call( cookie )
+          end
+        end
+
+        API.sqlite3_commit_hook( db, block&&@commit_hook_handler_callback,
+          data )
+      end
+    end
+
+    private
+
+      def utf16_length(ptr)
+        len = 0
+        loop do
+          break if ptr[len,1] == "\0"
+          len += 2
+        end
+        len
+      end
+
+  end
+
+end ; end ; end
diff --git a/lib/sqlite3/driver/native/driver.rb b/lib/sqlite3/driver/native/driver.rb
new file mode 100644
index 0000000..ee5e4a7
--- /dev/null
+++ b/lib/sqlite3/driver/native/driver.rb
@@ -0,0 +1,218 @@
+#--
+# =============================================================================
+# Copyright (c) 2004, Jamis Buck (jgb3@email.byu.edu)
+# All rights reserved.
+# 
+# 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 names of its contributors may not be used to endorse or promote
+#       products derived from this software without specific prior written
+#       permission.
+# 
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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.
+# =============================================================================
+#++
+
+require 'sqlite3_api'
+
+module SQLite3 ; module Driver ; module Native
+
+  class Driver
+
+    def initialize
+      @callback_data = Hash.new
+    end
+
+    def complete?( sql, utf16=false )
+      API.send( utf16 ? :sqlite3_complete16 : :sqlite3_complete, sql ) != 0
+    end
+
+    def busy_handler( db, data=nil, &block )
+      if block
+        cb = API::CallbackData.new
+        cb.proc = block
+        cb.data = data
+      end
+
+      API.sqlite3_busy_handler( db,
+        block ? API::Sqlite3_ruby_busy_handler : nil, cb )
+    end
+
+    def set_authorizer( db, data=nil, &block )
+      if block
+        cb = API::CallbackData.new
+        cb.proc = block
+        cb.data = data
+      end
+
+      API.sqlite3_set_authorizer( db,
+        block ? API::Sqlite3_ruby_authorizer : nil, cb )
+    end
+
+    def trace( db, data=nil, &block )
+      if block
+        cb = API::CallbackData.new
+        cb.proc = block
+        cb.data = data
+      end
+
+      API.sqlite3_trace( db,
+        block ? API::Sqlite3_ruby_trace : nil, cb )
+    end
+
+    def open( filename, utf16=false )
+      API.send( utf16 ? :sqlite3_open16 : :sqlite3_open, filename )
+    end
+
+    def errmsg( db, utf16=false )
+      API.send( utf16 ? :sqlite3_errmsg16 : :sqlite3_errmsg, db )
+    end
+
+    def prepare( db, sql, utf16=false )
+      API.send( ( utf16 ? :sqlite3_prepare16 : :sqlite3_prepare ),
+        db, sql )
+    end
+
+    def bind_text( stmt, index, value, utf16=false )
+      API.send( ( utf16 ? :sqlite3_bind_text16 : :sqlite3_bind_text ),
+        stmt, index, value )
+    end
+
+    def column_name( stmt, index, utf16=false )
+      API.send( ( utf16 ? :sqlite3_column_name16 : :sqlite3_column_name ),
+        stmt, index )
+    end
+
+    def column_decltype( stmt, index, utf16=false )
+      API.send(
+        ( utf16 ? :sqlite3_column_decltype16 : :sqlite3_column_decltype ),
+        stmt, index )
+    end
+
+    def column_text( stmt, index, utf16=false )
+      API.send( ( utf16 ? :sqlite3_column_text16 : :sqlite3_column_text ),
+        stmt, index )
+    end
+
+    def create_function( db, name, args, text, cookie, func, step, final )
+      if func || ( step && final )
+        cb = API::CallbackData.new
+        cb.proc = cb.proc2 = nil
+        cb.data = cookie
+        @callback_data[ name ] = cb
+      else
+        @callback_data.delete( name )
+      end
+
+      if func
+        cb.proc = func
+
+        func = API::Sqlite3_ruby_function_step
+        step = final = nil
+      elsif step && final
+        cb.proc = step
+        cb.proc2 = final
+
+        func = nil
+        step = API::Sqlite3_ruby_function_step
+        final = API::Sqlite3_ruby_function_final
+      end
+
+      API.sqlite3_create_function( db, name, args, text, cb, func, step, final )
+    end
+
+    def value_text( value, utf16=false )
+      method = case utf16
+        when nil, false then :sqlite3_value_text
+        when :le then :sqlite3_value_text16le
+        when :be then :sqlite3_value_text16be
+        else :sqlite3_value_text16
+      end
+
+      API.send( method, value )
+    end
+
+    def result_text( context, result, utf16=false )
+      method = case utf16
+        when nil, false then :sqlite3_result_text
+        when :le then :sqlite3_result_text16le
+        when :be then :sqlite3_result_text16be
+        else :sqlite3_result_text16
+      end
+
+      API.send( method, context, result.to_s )
+    end
+
+    def result_error( context, value, utf16=false )
+      API.send( ( utf16 ? :sqlite3_result_error16 : :sqlite3_result_error ),
+        context, value )
+    end
+
+    def self.api_delegate( name )
+      define_method( name ) { |*args| API.send( "sqlite3_#{name}", *args ) }
+    end
+
+    api_delegate :libversion
+    api_delegate :close
+    api_delegate :last_insert_rowid
+    api_delegate :changes
+    api_delegate :total_changes
+    api_delegate :interrupt
+    api_delegate :busy_timeout
+    api_delegate :errcode
+    api_delegate :bind_blob
+    api_delegate :bind_double
+    api_delegate :bind_int
+    api_delegate :bind_int64
+    api_delegate :bind_null
+    api_delegate :bind_parameter_count
+    api_delegate :bind_parameter_name
+    api_delegate :bind_parameter_index
+    api_delegate :column_count
+    api_delegate :step
+    api_delegate :data_count
+    api_delegate :column_blob
+    api_delegate :column_bytes
+    api_delegate :column_bytes16
+    api_delegate :column_double
+    api_delegate :column_int
+    api_delegate :column_int64
+    api_delegate :column_type
+    api_delegate :finalize
+    api_delegate :reset
+    api_delegate :aggregate_count
+    api_delegate :value_blob
+    api_delegate :value_bytes
+    api_delegate :value_bytes16
+    api_delegate :value_double
+    api_delegate :value_int
+    api_delegate :value_int64
+    api_delegate :value_type
+    api_delegate :result_blob
+    api_delegate :result_double
+    api_delegate :result_int
+    api_delegate :result_int64
+    api_delegate :result_null
+    api_delegate :result_value
+    api_delegate :aggregate_context
+
+  end
+
+end ; end ; end