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/* -*- c-file-style: "gnu"; indent-tabs-mode: nil -*- */
/*
* Ruby Cairo Binding
*
* Copyright 2005-2021 Sutou Kouhei <kou@cozmixng.org>
*
* This file is made available under the same terms as Ruby
*
*/
#include "rb_cairo.h"
#include "rb_cairo_private.h"
#include "rb_cairo_io.h"
ID rb_cairo__io_id_read;
ID rb_cairo__io_id_write;
ID rb_cairo__io_id_output;
ID rb_cairo__io_id_to_io;
ID rb_cairo__io_id_to_path;
/* read/write callback */
rb_cairo__io_callback_closure_t *
rb_cairo__io_closure_new (VALUE target)
{
rb_cairo__io_callback_closure_t *closure;
closure = ALLOC (rb_cairo__io_callback_closure_t);
closure->target = target;
closure->error = Qnil;
return closure;
}
void
rb_cairo__io_closure_destroy (rb_cairo__io_callback_closure_t *closure)
{
xfree (closure);
}
void
rb_cairo__io_closure_free (void *closure)
{
rb_cairo__io_closure_destroy ((rb_cairo__io_callback_closure_t *) closure);
}
static VALUE
rb_cairo__io_func_rescue (VALUE io_closure, VALUE error)
{
rb_cairo__io_callback_closure_t *closure;
closure = (rb_cairo__io_callback_closure_t *)io_closure;
closure->error = error;
return Qnil;
}
static VALUE
rb_cairo__io_func_invoke (VALUE user_data)
{
rb_cairo__io_invoke_data_t *data;
data = (rb_cairo__io_invoke_data_t *)user_data;
return rb_rescue2 (data->func, data->data,
rb_cairo__io_func_rescue, data->data, rb_eException,
(VALUE)0);
}
/* write callback */
static VALUE
rb_cairo__io_write_func_invoke (VALUE write_closure)
{
VALUE output, data;
long written_bytes;
rb_cairo__io_callback_closure_t *closure;
long length;
closure = (rb_cairo__io_callback_closure_t *)write_closure;
output = closure->target;
data = rb_str_new ((const char *)closure->data, closure->length);
length = RSTRING_LEN (data);
while (length != 0)
{
VALUE rb_written_bytes = rb_funcall (output,
rb_cairo__io_id_write, 1, data);
written_bytes = NUM2LONG (rb_written_bytes);
data = rb_str_substr (data, written_bytes,
RSTRING_LEN (data) - written_bytes);
length -= written_bytes;
}
return Qnil;
}
cairo_status_t
rb_cairo__io_write_func (void *write_closure,
const unsigned char *data, unsigned int length)
{
rb_cairo__io_callback_closure_t *closure;
rb_cairo__io_invoke_data_t invoke_data;
closure = (rb_cairo__io_callback_closure_t *)write_closure;
closure->data = (unsigned char *)data;
closure->length = length;
invoke_data.func = rb_cairo__io_write_func_invoke;
invoke_data.data = (VALUE)closure;
rb_cairo__invoke_callback (rb_cairo__io_func_invoke, (VALUE)&invoke_data);
if (NIL_P (closure->error))
return CAIRO_STATUS_SUCCESS;
else
return CAIRO_STATUS_WRITE_ERROR;
}
/* read callback */
static VALUE
rb_cairo__io_read_func_invoke (VALUE read_closure)
{
VALUE input, result;
rb_cairo__io_callback_closure_t *closure;
long length, rest;
closure = (rb_cairo__io_callback_closure_t *)read_closure;
input = closure->target;
length = closure->length;
result = rb_str_new2 ("");
for (rest = length; rest != 0; rest = length - RSTRING_LEN (result))
{
rb_str_concat (result,
rb_funcall (input,
rb_cairo__io_id_read, 1, LONG2NUM (rest)));
}
memcpy ((void *)closure->data, (const void *) StringValuePtr (result), length);
return Qnil;
}
cairo_status_t
rb_cairo__io_read_func (void *read_closure,
unsigned char *data, unsigned int length)
{
rb_cairo__io_callback_closure_t *closure;
rb_cairo__io_invoke_data_t invoke_data;
closure = (rb_cairo__io_callback_closure_t *)read_closure;
closure->data = data;
closure->length = length;
invoke_data.func = rb_cairo__io_read_func_invoke;
invoke_data.data = (VALUE)closure;
rb_cairo__invoke_callback (rb_cairo__io_func_invoke, (VALUE)&invoke_data);
if (NIL_P (closure->error))
return CAIRO_STATUS_SUCCESS;
else
return CAIRO_STATUS_READ_ERROR;
}
void
Init_cairo_io (void)
{
rb_cairo__io_id_read = rb_intern ("read");
rb_cairo__io_id_write = rb_intern ("write");
rb_cairo__io_id_output = rb_intern ("output");
rb_cairo__io_id_to_io = rb_intern ("to_io");
rb_cairo__io_id_to_path = rb_intern ("to_path");
}
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