gem structure and POC library code

10 files changed, 622 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..f9a64da
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,28 @@
+*.gem
+*.rake_tasks~
+*.rbc
+*.swo
+*.swp
+*/tags
+*~
+.DS_Store
+.autotest
+.bundle
+.config
+.idea
+.rvmrc
+.yardoc
+Gemfile.lock
+InstalledFiles
+_yardoc
+coverage
+doc
+doc/
+erl_crash.dump
+lib/bundler/man
+pkg
+rdoc
+spec/reports
+test/tmp
+test/version_tmp
+tmp
diff --git a/.rspec b/.rspec
new file mode 100644
index 0000000..eca491f
--- /dev/null
+++ b/.rspec
@@ -0,0 +1 @@
+-cbfp
diff --git a/Gemfile b/Gemfile
new file mode 100644
index 0000000..a3a584c
--- /dev/null
+++ b/Gemfile
@@ -0,0 +1,4 @@
+source :rubygems
+
+gemspec :name => "ffi-yajl"
+
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..11069ed
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,201 @@
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+
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diff --git a/README.md b/README.md
new file mode 100644
index 0000000..f783214
--- /dev/null
+++ b/README.md
@@ -0,0 +1,3 @@
+
+nothing yet...
+
diff --git a/Rakefile b/Rakefile
new file mode 100644
index 0000000..501ffed
--- /dev/null
+++ b/Rakefile
@@ -0,0 +1,25 @@
+require 'rspec/core/rake_task'
+require 'rubygems/package_task'
+
+Dir[File.expand_path("../*gemspec", __FILE__)].reverse.each do |gemspec_path|
+  gemspec = eval(IO.read(gemspec_path))
+  Gem::PackageTask.new(gemspec).define
+end
+
+require 'ffi_yajl/version'
+
+desc "Run all specs in spec directory"
+RSpec::Core::RakeTask.new(:spec) do |t|
+  t.pattern = FileList['spec/**/*_spec.rb']
+end
+
+desc "Build it and ship it"
+task :ship => [:clean, :gem] do
+  sh("git tag #{Mixlib::ShellOut::VERSION}")
+  sh("git push --tags")
+  Dir[File.expand_path("../pkg/*.gem", __FILE__)].reverse.each do |built_gem|
+    sh("gem push #{built_gem}")
+  end
+end
+
+task :default => :spec
diff --git a/ffi-yajl.gemspec b/ffi-yajl.gemspec
new file mode 100644
index 0000000..39daaca
--- /dev/null
+++ b/ffi-yajl.gemspec
@@ -0,0 +1,23 @@
+$:.unshift(File.dirname(__FILE__) + '/lib')
+require 'ffi-yajl/version'
+
+Gem::Specification.new do |s|
+  s.name = 'ffi-yajl'
+  s.version = FFI_Yajl::VERSION
+  s.platform = Gem::Platform::RUBY
+  s.extra_rdoc_files = ["README.md", "LICENSE" ]
+  s.summary = "Ruby FFI wrapper around YAJL 2.x"
+  s.description = s.summary
+  s.author = "Lamont Granquist"
+  s.email = "lamont@scriptkiddie.org"
+  s.homepage = "http://github.com/lamont-granquist/ffi-yajl"
+
+
+  s.add_development_dependency "rspec", "~> 2.14"
+  s.add_dependency "ffi", "~> 1.9"
+
+  s.bindir       = "bin"
+  s.executables  = []
+  s.require_path = 'lib'
+  s.files = %w(LICENSE README.md) + Dir.glob("lib/**/*")
+end
diff --git a/lib/ffi_yajl.rb b/lib/ffi_yajl.rb
new file mode 100644
index 0000000..b3a2914
--- /dev/null
+++ b/lib/ffi_yajl.rb
@@ -0,0 +1,261 @@
+require 'rubygems'
+require 'ffi'
+
+
+module FFI_Yajl
+  extend FFI::Library
+  ffi_lib 'yajl'
+
+  class YajlCallbacks < FFI::Struct
+    layout :yajl_null, :pointer,
+      :yajl_boolean, :pointer,
+      :yajl_integer, :pointer,
+      :yajl_double, :pointer,
+      :yajl_number, :pointer,
+      :yajl_string, :pointer,
+      :yajl_start_map, :pointer,
+      :yajl_map_key, :pointer,
+      :yajl_end_map, :pointer,
+      :yajl_start_array, :pointer,
+      :yajl_end_array, :pointer
+  end
+
+  enum :yajl_status, [
+    :yajl_status_ok,
+    :yajl_status_client_canceled,
+    :yajl_status_insufficient_data,
+    :yajl_status_error,
+  ]
+
+  enum :yajl_gen_status, [
+    :yajl_gen_status_ok,
+    :yajl_gen_keys_must_be_strings,
+    :yajl_max_depth_exceeded,
+    :yajl_gen_in_error_state,
+    :yajl_gen_generation_complete,
+    :yajl_gen_invalid_number,
+    :yajl_gen_no_buf,
+  ]
+
+  enum :yajl_option, [
+    :yajl_allow_comments, 0x01,
+    :yajl_dont_validate_strings, 0x02,
+    :yajl_allow_trailing_garbage, 0x04,
+    :yajl_allow_multiple_values, 0x08,
+    :yajl_allow_partial_values, 0x10,
+  ]
+
+  enum :yajl_gen_option, [
+    :yajl_gen_beautify, 0x01,
+    :yajl_gen_indent_string, 0x02,
+    :yajl_gen_print_callback, 0x04,
+    :yajl_gen_validate_utf8, 0x08,
+  ]
+
+  typedef :pointer, :yajl_handle
+  typedef :pointer, :yajl_gen
+
+  # yajl uses unsinged char *'s consistently
+  typedef :pointer, :ustring_pointer
+  typedef :string, :ustring
+
+  # const char *yajl_status_to_string (yajl_status code)
+  attach_function :yajl_status_to_string, [ :yajl_status ], :string
+  # yajl_handle yajl_alloc(const yajl_callbacks * callbacks, yajl_alloc_funcs * afs, void * ctx)
+  attach_function :yajl_alloc, [:pointer, :pointer, :pointer], :yajl_handle
+  # void yajl_free (yajl_handle handle)
+  attach_function :yajl_free, [:yajl_handle], :void
+  # yajl_status yajl_parse (yajl_handle hand, const unsigned char *jsonText, unsigned int jsonTextLength)
+  attach_function :yajl_parse, [:yajl_handle, :ustring, :uint], :yajl_status
+  # yajl_status yajl_parse_complete (yajl_handle hand)
+  attach_function :yajl_complete_parse, [:yajl_handle], :yajl_status
+  # unsigned char *yajl_get_error (yajl_handle hand, int verbose, const unsigned char *jsonText, unsigned int jsonTextLength)
+  attach_function :yajl_get_error, [:yajl_handle, :int, :ustring, :int], :ustring
+  # void yajl_free_error (yajl_handle hand, unsigned char *str)
+  attach_function :yajl_free_error, [:yajl_handle, :ustring], :void
+
+  #
+  attach_function :yajl_config, [:yajl_handle, :yajl_option, :int], :int
+
+  attach_function :yajl_gen_config, [:yajl_gen, :yajl_gen_option, :int], :int
+
+  # yajl_gen yajl_gen_alloc (const yajl_gen_config *config, const yajl_alloc_funcs *allocFuncs)
+  attach_function :yajl_gen_alloc, [:pointer, :pointer], :yajl_gen
+  # yajl_gen yajl_gen_alloc2 (const yajl_print_t callback, const yajl_gen_config *config, const yajl_alloc_funcs *allocFuncs, void *ctx)
+  # attach_function :yajl_gen_alloc2, [:pointer, :pointer, :pointer, :pointer], :yajl_gen
+  # void  yajl_gen_free (yajl_gen handle)
+  attach_function :yajl_gen_free, [:yajl_gen], :void
+
+  attach_function :yajl_gen_integer, [:yajl_gen, :long], :yajl_gen_status
+  attach_function :yajl_gen_double, [:yajl_gen, :double], :yajl_gen_status
+#  attach_function :yajl_gen_number
+  attach_function :yajl_gen_string, [:yajl_gen, :ustring, :int], :yajl_gen_status
+  attach_function :yajl_gen_null, [:yajl_gen], :yajl_gen_status
+  attach_function :yajl_gen_bool, [:yajl_gen, :int], :yajl_gen_status
+  attach_function :yajl_gen_map_open, [:yajl_gen], :yajl_gen_status
+  attach_function :yajl_gen_map_close, [:yajl_gen], :yajl_gen_status
+  attach_function :yajl_gen_array_open, [:yajl_gen], :yajl_gen_status
+  attach_function :yajl_gen_array_close, [:yajl_gen], :yajl_gen_status
+  # yajl_gen_status yajl_gen_get_buf (yajl_gen hand, const unsigned char **buf, unsigned int *len)
+  attach_function :yajl_gen_get_buf, [:yajl_gen, :pointer ,:pointer], :yajl_gen_status
+  # void yajl_gen_clear (yajl_gen hand)
+  attach_function :yajl_gen_clear, [:yajl_gen], :void
+
+  class ParseError < StandardError; end
+  class EncodeError < StandardError; end
+
+  class Parser
+    class State
+      attr_accessor :stack, :key
+      def initialize
+        @stack = Array.new
+      end
+
+      def set_value(val)
+        case @stack.last
+        when Hash
+          raise if key.nil?
+          @stack.last[@key] = val
+        when Array
+          @stack.last.push(val)
+        else
+          raise
+        end
+      end
+    end
+
+    NullCallback = FFI::Function.new(:int, [:pointer]) do |ctx|
+      @@CTX_MAPPING[ctx.get_ulong(0)].set_value(nil)
+      1
+    end
+    BooleanCallback = FFI::Function.new(:int, [:pointer, :int]) do |ctx, boolval|
+      @@CTX_MAPPING[ctx.get_ulong(0)].set_value(boolval == 1 ? true : false)
+      1
+    end
+    IntegerCallback = FFI::Function.new(:int, [:pointer, :long_long]) do |ctx, intval|
+      @@CTX_MAPPING[ctx.get_ulong(0)].set_value(intval)
+      1
+    end
+    DoubleCallback = FFI::Function.new(:int, [:pointer, :double]) do |ctx, doubleval|
+      @@CTX_MAPPING[ctx.get_ulong(0)].set_value(doubleval)
+      1
+    end
+    NumberCallback = FFI::Function.new(:int, [:pointer, :pointer, :size_t]) do |ctx, numberval, numberlen|
+      raise "not implemented"
+      1
+    end
+    StringCallback = FFI::Function.new(:int, [:pointer, :string, :size_t]) do |ctx, stringval, stringlen|
+      @@CTX_MAPPING[ctx.get_ulong(0)].set_value(stringval.slice(0,stringlen))
+      1
+    end
+    StartMapCallback = FFI::Function.new(:int, [:pointer]) do |ctx|
+      @@CTX_MAPPING[ctx.get_ulong(0)].stack.push(Hash.new)
+      1
+    end
+    MapKeyCallback = FFI::Function.new(:int, [:pointer, :string, :size_t]) do |ctx, key, keylen|
+      @@CTX_MAPPING[ctx.get_ulong(0)].key = key.slice(0,keylen)
+      1
+    end
+    EndMapCallback = FFI::Function.new(:int, [:pointer]) do |ctx|
+      @@CTX_MAPPING[ctx.get_ulong(0)].set_value( @@CTX_MAPPING[ctx.get_ulong(0)].stack.pop ) unless @@CTX_MAPPING[ctx.get_ulong(0)].stack.length == 1
+      1
+    end
+    StartArrayCallback = FFI::Function.new(:int, [:pointer]) do |ctx|
+      @@CTX_MAPPING[ctx.get_ulong(0)].stack.push(Array.new)
+      1
+    end
+    EndArrayCallback = FFI::Function.new(:int, [:pointer]) do |ctx|
+      @@CTX_MAPPING[ctx.get_ulong(0)].set_value( @@CTX_MAPPING[ctx.get_ulong(0)].stack.pop ) unless @@CTX_MAPPING[ctx.get_ulong(0)].stack.length == 1
+      1
+    end
+
+    def self.parse(str, opts)
+      @@CTX_MAPPING ||= Hash.new
+      rb_ctx = FFI_Yajl::Parser::State.new()
+      @@CTX_MAPPING[rb_ctx.object_id] = rb_ctx
+      ctx = FFI::MemoryPointer.new(:long)
+      ctx.write_long( rb_ctx.object_id )
+      callback_ptr = FFI::MemoryPointer.new(FFI_Yajl::YajlCallbacks)
+      callbacks = FFI_Yajl::YajlCallbacks.new(callback_ptr)
+      callbacks[:yajl_null] = NullCallback
+      callbacks[:yajl_boolean] = BooleanCallback
+      callbacks[:yajl_integer] = IntegerCallback
+      callbacks[:yajl_double] = DoubleCallback
+      callbacks[:yajl_number] = NumberCallback
+      callbacks[:yajl_string] = StringCallback
+      callbacks[:yajl_start_map] = StartMapCallback
+      callbacks[:yajl_map_key] = MapKeyCallback
+      callbacks[:yajl_end_map] = EndMapCallback
+      callbacks[:yajl_start_array] = StartArrayCallback
+      callbacks[:yajl_end_array] = EndArrayCallback
+      yajl_handle = FFI_Yajl.yajl_alloc(callback_ptr, nil, ctx)
+      if ( stat = FFI_Yajl.yajl_parse(yajl_handle, str, str.length)) != :yajl_status_ok
+        raise FFI_Yajl::ParseError.new("yajl_parse: #{stat}")
+      end
+      rb_ctx.stack.pop
+    ensure
+      FFI_Yajl.yajl_free(yajl_handle) if yajl_handle
+      @@CTX_MAPPING.delete(rb_ctx.object_id) if rb_ctx && rb_ctx.object_id
+    end
+  end
+
+  class Encoder
+    def self.encode(obj, opts)
+      yajl_gen = FFI_Yajl.yajl_gen_alloc(nil, nil)
+      FFI_Yajl.yajl_gen_config(yajl_gen, :yajl_gen_beautify, 1);
+      FFI_Yajl.yajl_gen_config(yajl_gen, :yajl_gen_validate_utf8, 1);
+      encode_part(obj, yajl_gen)
+      string_ptr = FFI::MemoryPointer.new(:string)
+      length_ptr = FFI::MemoryPointer.new(:int)
+      FFI_Yajl.yajl_gen_get_buf(yajl_gen, string_ptr, length_ptr)
+      length = length_ptr.read_int
+      string = string_ptr.get_pointer(0).read_string
+      FFI_Yajl.yajl_gen_free(yajl_gen)
+      return string
+    end
+
+    private
+
+    def self.encode_part(obj, yajl_gen)
+      case obj
+      when Hash
+        FFI_Yajl.yajl_gen_map_open(yajl_gen)
+        obj.each do |key, value|
+          encode_part(key, yajl_gen)
+          encode_part(value, yajl_gen)
+        end
+        FFI_Yajl.yajl_gen_map_close(yajl_gen)
+      when Array
+        FFI_Yajl.yajl_gen_array_open(yajl_gen)
+        obj.each do |value|
+          encode_part(value, yajl_gen)
+        end
+        FFI_Yajl.yajl_gen_array_close(yajl_gen)
+      when NilClass
+        FFI_Yajl.yajl_gen_null(yajl_gen)
+      when TrueClass
+        FFI_Yajl.yajl_gen_bool(yajl_gen, 0)
+      when FalseClass
+        FFI_Yajl.yajl_gen_bool(yajl_gen, 1)
+      when Fixnum
+        FFI_Yajl.yajl_gen_integer(yajl_gen, obj)
+      when Bignum
+        raise "not implemented"
+      when Float
+        FFI_Yajl.yajl_gen_double(yajl_gen, obj)
+      when String
+        FFI_Yajl.yajl_gen_string(yajl_gen, obj, obj.length)
+      else
+        if obj.respond_to?(to_json)
+          # obj.to_json
+          raise "not implemented"
+        else
+          # obj.to_s
+          raise "not implemented"
+        end
+      end
+    end
+
+  end
+end
+
diff --git a/lib/ffi_yajl/json_gem.rb b/lib/ffi_yajl/json_gem.rb
new file mode 100644
index 0000000..6e43cd6
--- /dev/null
+++ b/lib/ffi_yajl/json_gem.rb
@@ -0,0 +1,73 @@
+
+# JSON compatibility layer, largely plagarized from yajl-ruby
+
+require 'ffi_yajl' unless defined?(FFI_Yajl::Parser)
+
+unless defined?(ActiveSupport)
+  class Object
+    def to_json(*args, &block)
+      "\"#{to_s}\""
+    end
+  end
+end
+
+module JSON
+  class JSONError < StandardError; end unless defined?(JSON::JSONError)
+  class GeneratorError < JSONError; end unless defined?(JSON::GeneratorError)
+  class ParserError < JSONError; end unless defined?(JSON::ParserError)
+
+  def self.generate(obj, opts=nil)
+    #opts ||= {}
+    options_map = {}
+    #if opts.has_key?(:indent)
+    #  options_map[:pretty] = true
+    #  options_map[:indent] = opts[:indent]
+    #end
+    FFI_Yajl::Encoder.encode(obj, options_map)
+  rescue FFI_Yajl::EncodeError => e
+    raise JSON::GeneratorError, e.message
+  end
+
+  def self.pretty_generate(obj, opts={})
+    options_map = {}
+    #options_map[:pretty] = true
+    #options_map[:indent] = opts[:indent] if opts.has_key?(:indent)
+    FFI_Yajl::Encoder.encode(obj, options_map)
+  rescue FFI_Yajl::EncodeError => e
+    raise JSON::GeneratorError, e.message
+  end
+
+  def self.dump(obj, io=nil, *args)
+    FFI_Yajl::Encoder.encode(obj, io)
+  rescue FII_Yajl::EncodeError => e
+    raise JSON::GeneratorError, e.message
+  end
+
+  def self.default_options
+    #@default_options ||= {:symbolize_keys => false}
+    @default_options ||= {}
+  end
+
+  def self.parse(str, opts=JSON.default_options)
+    FFI_Yajl::Parser.parse(str, opts)
+  rescue FFI_Yajl::ParseError => e
+    raise JSON::ParserError, e.message
+  end
+
+  def self.load(input, *args)
+    FFI_Yajl::Parser.parse(input, default_options)
+  rescue FFI_Yajl::ParseError => e
+    raise JSON::ParserError, e.message
+  end
+end
+
+module ::Kernel
+  def JSON(object, opts = {})
+    if object.respond_to? :to_s
+      JSON.parse(object.to_s, JSON.default_options.merge(opts))
+    else
+      JSON.generate(object,opts)
+    end
+  end
+end
+
diff --git a/lib/ffi_yajl/version.rb b/lib/ffi_yajl/version.rb
new file mode 100644
index 0000000..76e5cea
--- /dev/null
+++ b/lib/ffi_yajl/version.rb
@@ -0,0 +1,3 @@
+class FFI_Yajl
+  VERSION = "0.0.1"
+end