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buffer_class.c
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buffer_class.c
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/*
* CBOR for Ruby
*
* Copyright (C) 2013 Carsten Bormann
*
* Licensed under the Apache License, Version 2.0 (the "License").
*
* Based on:
***********/
/*
* MessagePack for Ruby
*
* Copyright (C) 2008-2013 Sadayuki Furuhashi
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "compat.h"
#include "ruby.h"
#include "buffer.h"
#include "buffer_class.h"
VALUE cMessagePack_Buffer;
static ID s_read;
static ID s_readpartial;
static ID s_write;
static ID s_append;
static ID s_close;
#define BUFFER(from, name) \
msgpack_buffer_t *name = NULL; \
Data_Get_Struct(from, msgpack_buffer_t, name); \
if(name == NULL) { \
rb_raise(rb_eArgError, "NULL found for " # name " when shouldn't be."); \
}
#define CHECK_STRING_TYPE(value) \
value = rb_check_string_type(value); \
if( NIL_P(value) ) { \
rb_raise(rb_eTypeError, "instance of String needed"); \
}
static void Buffer_free(void* data)
{
if(data == NULL) {
return;
}
msgpack_buffer_t* b = (msgpack_buffer_t*) data;
msgpack_buffer_destroy(b);
xfree(b);
}
static VALUE Buffer_alloc(VALUE klass)
{
msgpack_buffer_t* b = ALLOC_N(msgpack_buffer_t, 1);
msgpack_buffer_init(b);
return Data_Wrap_Struct(klass, msgpack_buffer_mark, Buffer_free, b);
}
static ID get_partial_read_method(VALUE io)
{
if(rb_respond_to(io, s_readpartial)) {
return s_readpartial;
} else if(rb_respond_to(io, s_read)) {
return s_read;
} else {
return s_read;
}
}
static ID get_write_all_method(VALUE io)
{
if(rb_respond_to(io, s_write)) {
return s_write;
} else if(rb_respond_to(io, s_append)) {
return s_append;
} else {
return s_write;
}
}
void MessagePack_Buffer_initialize(msgpack_buffer_t* b, VALUE io, VALUE options)
{
b->io = io;
b->io_partial_read_method = get_partial_read_method(io);
b->io_write_all_method = get_write_all_method(io);
if(options != Qnil) {
VALUE v;
v = rb_hash_aref(options, ID2SYM(rb_intern("read_reference_threshold")));
if(v != Qnil) {
msgpack_buffer_set_read_reference_threshold(b, NUM2ULONG(v));
}
v = rb_hash_aref(options, ID2SYM(rb_intern("write_reference_threshold")));
if(v != Qnil) {
msgpack_buffer_set_write_reference_threshold(b, NUM2ULONG(v));
}
v = rb_hash_aref(options, ID2SYM(rb_intern("io_buffer_size")));
if(v != Qnil) {
msgpack_buffer_set_io_buffer_size(b, NUM2ULONG(v));
}
}
}
VALUE MessagePack_Buffer_wrap(msgpack_buffer_t* b, VALUE owner)
{
b->owner = owner;
return Data_Wrap_Struct(cMessagePack_Buffer, msgpack_buffer_mark, NULL, b);
}
static VALUE Buffer_initialize(int argc, VALUE* argv, VALUE self)
{
VALUE io = Qnil;
VALUE options = Qnil;
if(argc == 0 || (argc == 1 && argv[0] == Qnil)) {
/* Qnil */
} else if(argc == 1) {
VALUE v = argv[0];
if(rb_type(v) == T_HASH) {
options = v;
} else {
io = v;
}
} else if(argc == 2) {
io = argv[0];
options = argv[1];
if(rb_type(options) != T_HASH) {
rb_raise(rb_eArgError, "expected Hash but found %s.", rb_obj_classname(io));
}
} else {
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0..1)", argc);
}
BUFFER(self, b);
MessagePack_Buffer_initialize(b, io, options);
return self;
}
static VALUE Buffer_clear(VALUE self)
{
BUFFER(self, b);
msgpack_buffer_clear(b);
return Qnil;
}
static VALUE Buffer_size(VALUE self)
{
BUFFER(self, b);
size_t size = msgpack_buffer_all_readable_size(b);
return SIZET2NUM(size);
}
static VALUE Buffer_empty_p(VALUE self)
{
BUFFER(self, b);
if(msgpack_buffer_top_readable_size(b) == 0) {
return Qtrue;
} else {
return Qfalse;
}
}
static VALUE Buffer_write(VALUE self, VALUE string_or_buffer)
{
BUFFER(self, b);
VALUE string = string_or_buffer; // TODO optimize if string_or_buffer is a Buffer
StringValue(string);
size_t length = msgpack_buffer_append_string(b, string);
return SIZET2NUM(length);
}
static VALUE Buffer_append(VALUE self, VALUE string_or_buffer)
{
BUFFER(self, b);
VALUE string = string_or_buffer; // TODO optimize if string_or_buffer is a Buffer
StringValue(string);
msgpack_buffer_append_string(b, string);
return self;
}
#define MAKE_EMPTY_STRING(orig) \
if(orig == Qnil) { \
orig = rb_str_buf_new(0); \
} else { \
rb_str_resize(orig, 0); \
}
static VALUE read_until_eof_rescue(VALUE args)
{
msgpack_buffer_t* b = (void*) ((VALUE*) args)[0];
VALUE out = ((VALUE*) args)[1];
unsigned long max = ((VALUE*) args)[2];
size_t* sz = (void*) ((VALUE*) args)[3];
while(true) {
size_t rl;
if(max == 0) {
if(out == Qnil) {
rl = msgpack_buffer_skip(b, b->io_buffer_size);
} else {
rl = msgpack_buffer_read_to_string(b, out, b->io_buffer_size);
}
if(rl == 0) {
break;
}
*sz += rl;
} else {
if(out == Qnil) {
rl = msgpack_buffer_skip(b, max);
} else {
rl = msgpack_buffer_read_to_string(b, out, max);
}
if(rl == 0) {
break;
}
*sz += rl;
if(max <= rl) {
break;
} else {
max -= rl;
}
}
}
return Qnil;
}
static VALUE read_until_eof_error(VALUE args, VALUE error)
{
/* ignore EOFError */
UNUSED(args);
UNUSED(error);
return Qnil;
}
static inline size_t read_until_eof(msgpack_buffer_t* b, VALUE out, unsigned long max)
{
if(msgpack_buffer_has_io(b)) {
size_t sz = 0;
VALUE args[4] = { (VALUE)(void*) b, out, (VALUE) max, (VALUE)(void*) &sz };
rb_rescue2(read_until_eof_rescue, (VALUE)(void*) args,
read_until_eof_error, (VALUE)(void*) args,
rb_eEOFError, NULL);
return sz;
} else {
if(max == 0) {
max = ULONG_MAX;
}
if(out == Qnil) {
return msgpack_buffer_skip_nonblock(b, max);
} else {
return msgpack_buffer_read_to_string_nonblock(b, out, max);
}
}
}
static inline VALUE read_all(msgpack_buffer_t* b, VALUE out)
{
#ifndef DISABLE_BUFFER_READ_TO_S_OPTIMIZE
if(out == Qnil && !msgpack_buffer_has_io(b)) {
/* same as to_s && clear; optimize */
VALUE str = msgpack_buffer_all_as_string(b);
msgpack_buffer_clear(b);
return str;
}
#endif
MAKE_EMPTY_STRING(out);
read_until_eof(b, out, 0);
return out;
}
static VALUE Buffer_skip(VALUE self, VALUE sn)
{
BUFFER(self, b);
unsigned long n = FIX2ULONG(sn);
/* do nothing */
if(n == 0) {
return ULONG2NUM(0);
}
size_t sz = read_until_eof(b, Qnil, n);
return ULONG2NUM(sz);
}
static VALUE Buffer_skip_all(VALUE self, VALUE sn)
{
BUFFER(self, b);
unsigned long n = FIX2ULONG(sn);
/* do nothing */
if(n == 0) {
return self;
}
if(!msgpack_buffer_ensure_readable(b, n)) {
rb_raise(rb_eEOFError, "end of buffer reached");
}
msgpack_buffer_skip_nonblock(b, n);
return self;
}
static VALUE Buffer_read_all(int argc, VALUE* argv, VALUE self)
{
VALUE out = Qnil;
unsigned long n = 0;
bool all = false;
switch(argc) {
case 2:
out = argv[1];
/* pass through */
case 1:
n = FIX2ULONG(argv[0]);
break;
case 0:
all = true;
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0..2)", argc);
}
BUFFER(self, b);
if(out != Qnil) {
CHECK_STRING_TYPE(out);
}
if(all) {
return read_all(b, out);
}
if(n == 0) {
/* do nothing */
MAKE_EMPTY_STRING(out);
return out;
}
if(!msgpack_buffer_ensure_readable(b, n)) {
rb_raise(rb_eEOFError, "end of buffer reached");
}
MAKE_EMPTY_STRING(out);
msgpack_buffer_read_to_string_nonblock(b, out, n);
return out;
}
static VALUE Buffer_read(int argc, VALUE* argv, VALUE self)
{
VALUE out = Qnil;
unsigned long n = -1;
bool all = false;
switch(argc) {
case 2:
out = argv[1];
/* pass through */
case 1:
n = FIX2ULONG(argv[0]);
break;
case 0:
all = true;
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0..2)", argc);
}
BUFFER(self, b);
if(out != Qnil) {
CHECK_STRING_TYPE(out);
}
if(all) {
return read_all(b, out);
}
if(n == 0) {
/* do nothing */
MAKE_EMPTY_STRING(out);
return out;
}
#ifndef DISABLE_BUFFER_READ_TO_S_OPTIMIZE
if(!msgpack_buffer_has_io(b) && out == Qnil &&
msgpack_buffer_all_readable_size(b) <= n) {
/* same as to_s && clear; optimize */
VALUE str = msgpack_buffer_all_as_string(b);
msgpack_buffer_clear(b);
if(RSTRING_LEN(str) == 0) {
return Qnil;
} else {
return str;
}
}
#endif
MAKE_EMPTY_STRING(out);
read_until_eof(b, out, n);
if(RSTRING_LEN(out) == 0) {
return Qnil;
} else {
return out;
}
}
static VALUE Buffer_to_str(VALUE self)
{
BUFFER(self, b);
return msgpack_buffer_all_as_string(b);
}
static VALUE Buffer_to_a(VALUE self)
{
BUFFER(self, b);
return msgpack_buffer_all_as_string_array(b);
}
static VALUE Buffer_flush(VALUE self)
{
BUFFER(self, b);
msgpack_buffer_flush(b);
return self;
}
static VALUE Buffer_io(VALUE self)
{
BUFFER(self, b);
return b->io;
}
static VALUE Buffer_close(VALUE self)
{
BUFFER(self, b);
if(b->io != Qnil) {
return rb_funcall(b->io, s_close, 0);
}
return Qnil;
}
static VALUE Buffer_write_to(VALUE self, VALUE io)
{
BUFFER(self, b);
size_t sz = msgpack_buffer_flush_to_io(b, io, s_write, true);
return ULONG2NUM(sz);
}
void MessagePack_Buffer_module_init(VALUE mMessagePack)
{
s_read = rb_intern("read");
s_readpartial = rb_intern("readpartial");
s_write = rb_intern("write");
s_append = rb_intern("<<");
s_close = rb_intern("close");
msgpack_buffer_static_init();
cMessagePack_Buffer = rb_define_class_under(mMessagePack, "Buffer", rb_cObject);
rb_define_alloc_func(cMessagePack_Buffer, Buffer_alloc);
rb_define_method(cMessagePack_Buffer, "initialize", Buffer_initialize, -1);
rb_define_method(cMessagePack_Buffer, "clear", Buffer_clear, 0);
rb_define_method(cMessagePack_Buffer, "size", Buffer_size, 0);
rb_define_method(cMessagePack_Buffer, "empty?", Buffer_empty_p, 0);
rb_define_method(cMessagePack_Buffer, "write", Buffer_write, 1);
rb_define_method(cMessagePack_Buffer, "<<", Buffer_append, 1);
rb_define_method(cMessagePack_Buffer, "skip", Buffer_skip, 1);
rb_define_method(cMessagePack_Buffer, "skip_all", Buffer_skip_all, 1);
rb_define_method(cMessagePack_Buffer, "read", Buffer_read, -1);
rb_define_method(cMessagePack_Buffer, "read_all", Buffer_read_all, -1);
rb_define_method(cMessagePack_Buffer, "io", Buffer_io, 0);
rb_define_method(cMessagePack_Buffer, "flush", Buffer_flush, 0);
rb_define_method(cMessagePack_Buffer, "close", Buffer_close, 0);
rb_define_method(cMessagePack_Buffer, "write_to", Buffer_write_to, 1);
rb_define_method(cMessagePack_Buffer, "to_str", Buffer_to_str, 0);
rb_define_alias(cMessagePack_Buffer, "to_s", "to_str");
rb_define_method(cMessagePack_Buffer, "to_a", Buffer_to_a, 0);
}