Changed layout to support tagging and branching

1 files changed, 334 insertions, 0 deletions

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