CREATE TYPE pdf;

CREATE FUNCTION pdf_in(cstring) RETURNS pdf
    IMMUTABLE
    STRICT
    LANGUAGE C
AS
'MODULE_PATHNAME';

CREATE FUNCTION pdf_out(pdf) RETURNS cstring
    IMMUTABLE
    STRICT
    LANGUAGE C
AS
'MODULE_PATHNAME';

CREATE TYPE pdf
(
    INTERNALLENGTH = -1,
    INPUT = pdf_in,
    OUTPUT = pdf_out,
    STORAGE = extended
);

CREATE CAST (pdf AS text) WITH INOUT AS ASSIGNMENT;
CREATE CAST (text AS pdf) WITH INOUT AS ASSIGNMENT;


/* API */

CREATE FUNCTION pdf_title(pdf) RETURNS TEXT
    IMMUTABLE
    STRICT
    LANGUAGE C
AS
'MODULE_PATHNAME';

CREATE FUNCTION pdf_author(pdf) RETURNS TEXT
    IMMUTABLE
    STRICT
    LANGUAGE C
AS
'MODULE_PATHNAME';

CREATE FUNCTION pdf_num_pages(pdf) RETURNS INTEGER
    IMMUTABLE
    STRICT
    LANGUAGE C
AS
'MODULE_PATHNAME';

CREATE FUNCTION pdf_page(pdf, integer) RETURNS TEXT
    IMMUTABLE
    STRICT
    LANGUAGE C
AS
'MODULE_PATHNAME';

CREATE FUNCTION pdf_creator(pdf) RETURNS TEXT
    IMMUTABLE
    STRICT
    LANGUAGE C
AS
'MODULE_PATHNAME';

CREATE FUNCTION pdf_keywords(pdf) RETURNS TEXT
    IMMUTABLE
    STRICT
    LANGUAGE C
AS
'MODULE_PATHNAME';

CREATE FUNCTION pdf_metadata(pdf) RETURNS TEXT
    IMMUTABLE
    STRICT
    LANGUAGE C
AS
'MODULE_PATHNAME';

CREATE FUNCTION pdf_version(pdf) RETURNS TEXT
    IMMUTABLE
    STRICT
    LANGUAGE C
AS
'MODULE_PATHNAME';

CREATE FUNCTION pdf_subject(pdf) RETURNS TEXT
    IMMUTABLE
    STRICT
    LANGUAGE C
AS
'MODULE_PATHNAME';

CREATE FUNCTION pdf_creation(pdf) RETURNS TIMESTAMP
    IMMUTABLE
    STRICT
    LANGUAGE C
AS
'MODULE_PATHNAME';

CREATE FUNCTION pdf_modification(pdf) RETURNS TIMESTAMP
    IMMUTABLE
    STRICT
    LANGUAGE C
AS
'MODULE_PATHNAME';


CREATE FUNCTION bytea_to_pdf(bytea) RETURNS pdf
    LANGUAGE C
    IMMUTABLE
    STRICT
AS
'MODULE_PATHNAME';


CREATE FUNCTION pdf_to_bytea(pdf) RETURNS bytea
    LANGUAGE C
    IMMUTABLE
    STRICT
AS
'MODULE_PATHNAME';

CREATE CAST (bytea AS pdf) WITH FUNCTION bytea_to_pdf(bytea) AS ASSIGNMENT;
CREATE CAST (pdf AS bytea) WITH FUNCTION pdf_to_bytea(pdf) AS ASSIGNMENT;

--------------------

CREATE FUNCTION pdf_read_file(text) RETURNS text
    LANGUAGE SQL
    IMMUTABLE
    STRICT
AS 'SELECT $1::pdf::text';


CREATE FUNCTION pdf_read_bytes(bytea) RETURNS text
    LANGUAGE SQL
    IMMUTABLE
    STRICT
AS 'SELECT $1::bytea::pdf::text';