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mongo-ruby-driver/ext/cbson/cbson.c

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/*
* Copyright 2009 10gen, Inc.
*
* 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.
*/
/*
* This file contains C implementations of some of the functions needed by the
* bson module. If possible, these implementations should be used to speed up
* BSON encoding and decoding.
*/
#include "ruby.h"
#if HAVE_RUBY_ST_H
#include "ruby/st.h"
#endif
#if HAVE_ST_H
#include "st.h"
#endif
#if HAVE_RUBY_REGEX_H
#include "ruby/regex.h"
#endif
#if HAVE_REGEX_H
#include "regex.h"
#endif
#include <assert.h>
#include <math.h>
#include <unistd.h>
#include <time.h>
#define INITIAL_BUFFER_SIZE 256
static VALUE Binary;
static VALUE Time;
static VALUE ObjectID;
static VALUE DBRef;
static VALUE Code;
static VALUE RegexpOfHolding;
static VALUE OrderedHash;
static VALUE InvalidName;
static VALUE DigestMD5;
#if HAVE_RUBY_ENCODING_H
#include "ruby/encoding.h"
#define STR_NEW(p,n) rb_enc_str_new((p), (n), rb_utf8_encoding())
#else
#define STR_NEW(p,n) rb_str_new((p), (n))
#endif
// this sucks. but for some reason these moved around between 1.8 and 1.9
#ifdef ONIGURUMA_H
#define IGNORECASE ONIG_OPTION_IGNORECASE
#define MULTILINE ONIG_OPTION_MULTILINE
#define EXTENDED ONIG_OPTION_EXTEND
#else
#define IGNORECASE RE_OPTION_IGNORECASE
#define MULTILINE RE_OPTION_MULTILINE
#define EXTENDED RE_OPTION_EXTENDED
#endif
/* TODO we ought to check that the malloc or asprintf was successful
* and raise an exception if not. */
#ifdef _MSC_VER
#define INT2STRING(buffer, i) \
{ \
int vslength = _scprintf("%d", i) + 1; \
*buffer = malloc(vslength); \
_snprintf(*buffer, vslength, "%d", i); \
}
#else
#define INT2STRING(buffer, i) asprintf(buffer, "%d", i);
#endif
// this sucks too.
#ifndef RREGEXP_SRC_PTR
#define RREGEXP_SRC_PTR(r) RREGEXP(r)->str
#define RREGEXP_SRC_LEN(r) RREGEXP(r)->len
#endif
typedef struct {
char* buffer;
int size;
int position;
} bson_buffer;
static char zero = 0;
static char one = 1;
static int cmp_char(const void* a, const void* b) {
return *(char*)a - *(char*)b;
}
static void write_doc(bson_buffer* buffer, VALUE hash, VALUE check_keys);
static int write_element(VALUE key, VALUE value, VALUE extra);
static VALUE elements_to_hash(const char* buffer, int max);
static bson_buffer* buffer_new(void) {
bson_buffer* buffer;
buffer = ALLOC(bson_buffer);
assert(buffer);
buffer->size = INITIAL_BUFFER_SIZE;
buffer->position = 0;
buffer->buffer = ALLOC_N(char, INITIAL_BUFFER_SIZE);
assert(buffer->buffer);
return buffer;
}
static void buffer_free(bson_buffer* buffer) {
assert(buffer);
assert(buffer->buffer);
free(buffer->buffer);
free(buffer);
}
static void buffer_resize(bson_buffer* buffer, int min_length) {
int size = buffer->size;
if (size >= min_length) {
return;
}
while (size < min_length) {
size *= 2;
}
buffer->buffer = REALLOC_N(buffer->buffer, char, size);
assert(buffer->buffer);
buffer->size = size;
}
static void buffer_assure_space(bson_buffer* buffer, int size) {
if (buffer->position + size <= buffer->size) {
return;
}
buffer_resize(buffer, buffer->position + size);
}
/* returns offset for writing */
static int buffer_save_bytes(bson_buffer* buffer, int size) {
int position = buffer->position;
buffer_assure_space(buffer, size);
buffer->position += size;
return position;
}
static void buffer_write_bytes(bson_buffer* buffer, const char* bytes, int size) {
buffer_assure_space(buffer, size);
memcpy(buffer->buffer + buffer->position, bytes, size);
buffer->position += size;
}
static VALUE pack_extra(bson_buffer* buffer, VALUE check_keys) {
return rb_ary_new3(2, LL2NUM((long long)buffer), check_keys);
}
static void write_name_and_type(bson_buffer* buffer, VALUE name, char type) {
buffer_write_bytes(buffer, &type, 1);
buffer_write_bytes(buffer, RSTRING_PTR(name), RSTRING_LEN(name));
buffer_write_bytes(buffer, &zero, 1);
}
static int write_element_allow_id(VALUE key, VALUE value, VALUE extra, int allow_id) {
bson_buffer* buffer = (bson_buffer*)NUM2LL(rb_ary_entry(extra, 0));
VALUE check_keys = rb_ary_entry(extra, 1);
if (TYPE(key) == T_SYMBOL) {
// TODO better way to do this... ?
key = rb_str_new2(rb_id2name(SYM2ID(key)));
}
if (TYPE(key) != T_STRING) {
rb_raise(rb_eTypeError, "keys must be strings or symbols");
}
if (!allow_id && strcmp("_id", RSTRING_PTR(key)) == 0) {
return ST_CONTINUE;
}
if (check_keys == Qtrue) {
int i;
if (RSTRING_LEN(key) > 0 && RSTRING_PTR(key)[0] == '$') {
rb_raise(InvalidName, "key must not start with '$'");
}
for (i = 0; i < RSTRING_LEN(key); i++) {
if (RSTRING_PTR(key)[i] == '.') {
rb_raise(InvalidName, "key must not contain '.'");
}
}
}
switch(TYPE(value)) {
case T_BIGNUM:
case T_FIXNUM:
{
if (rb_funcall(value, rb_intern(">"), 1, LL2NUM(9223372036854775807LL)) == Qtrue ||
rb_funcall(value, rb_intern("<"), 1, LL2NUM(-9223372036854775808LL)) == Qtrue) {
rb_raise(rb_eRangeError, "MongoDB can only handle 8-byte ints");
}
if (rb_funcall(value, rb_intern(">"), 1, INT2NUM(2147483647L)) == Qtrue ||
rb_funcall(value, rb_intern("<"), 1, INT2NUM(-2147483648L)) == Qtrue) {
long long ll_value;
write_name_and_type(buffer, key, 0x12);
ll_value = NUM2LL(value);
buffer_write_bytes(buffer, (char*)&ll_value, 8);
} else {
int int_value;
write_name_and_type(buffer, key, 0x10);
int_value = NUM2LL(value);
buffer_write_bytes(buffer, (char*)&int_value, 4);
}
break;
}
case T_TRUE:
{
write_name_and_type(buffer, key, 0x08);
buffer_write_bytes(buffer, &one, 1);
break;
}
case T_FALSE:
{
write_name_and_type(buffer, key, 0x08);
buffer_write_bytes(buffer, &zero, 1);
break;
}
case T_FLOAT:
{
double d = NUM2DBL(value);
write_name_and_type(buffer, key, 0x01);
buffer_write_bytes(buffer, (char*)&d, 8);
break;
}
case T_NIL:
{
write_name_and_type(buffer, key, 0x0A);
break;
}
case T_HASH:
{
write_name_and_type(buffer, key, 0x03);
write_doc(buffer, value, check_keys);
break;
}
case T_ARRAY:
{
int start_position, length_location, items, i, obj_length;
VALUE* values;
write_name_and_type(buffer, key, 0x04);
start_position = buffer->position;
// save space for length
length_location = buffer_save_bytes(buffer, 4);
items = RARRAY_LEN(value);
values = RARRAY_PTR(value);
for(i = 0; i < items; i++) {
char* name;
VALUE key;
INT2STRING(&name, i);
key = rb_str_new2(name);
write_element(key, values[i], pack_extra(buffer, check_keys));
free(name);
}
// write null byte and fill in length
buffer_write_bytes(buffer, &zero, 1);
obj_length = buffer->position - start_position;
memcpy(buffer->buffer + length_location, &obj_length, 4);
break;
}
case T_STRING:
{
if (strcmp(rb_class2name(RBASIC(value)->klass),
"Mongo::Code") == 0) {
int start_position, length_location, length, total_length;
write_name_and_type(buffer, key, 0x0F);
start_position = buffer->position;
length_location = buffer_save_bytes(buffer, 4);
length = RSTRING_LEN(value) + 1;
buffer_write_bytes(buffer, (char*)&length, 4);
buffer_write_bytes(buffer, RSTRING_PTR(value), length - 1);
buffer_write_bytes(buffer, &zero, 1);
write_doc(buffer, rb_funcall(value, rb_intern("scope"), 0), Qfalse);
total_length = buffer->position - start_position;
memcpy(buffer->buffer + length_location, &total_length, 4);
break;
} else {
int length = RSTRING_LEN(value) + 1;
write_name_and_type(buffer, key, 0x02);
buffer_write_bytes(buffer, (char*)&length, 4);
buffer_write_bytes(buffer, RSTRING_PTR(value), length - 1);
buffer_write_bytes(buffer, &zero, 1);
break;
}
}
case T_SYMBOL:
{
const char* str_value = rb_id2name(SYM2ID(value));
int length = strlen(str_value) + 1;
write_name_and_type(buffer, key, 0x0E);
buffer_write_bytes(buffer, (char*)&length, 4);
buffer_write_bytes(buffer, str_value, length);
break;
}
case T_OBJECT:
{
// TODO there has to be a better way to do these checks...
const char* cls = rb_class2name(RBASIC(value)->klass);
if (strcmp(cls, "Mongo::Binary") == 0 ||
strcmp(cls, "ByteBuffer") == 0) {
const char subtype = strcmp(cls, "ByteBuffer") ?
(const char)FIX2INT(rb_funcall(value, rb_intern("subtype"), 0)) : 2;
VALUE string_data = rb_funcall(value, rb_intern("to_s"), 0);
int length = RSTRING_LEN(string_data);
write_name_and_type(buffer, key, 0x05);
if (subtype == 2) {
const int other_length = length + 4;
buffer_write_bytes(buffer, (const char*)&other_length, 4);
buffer_write_bytes(buffer, &subtype, 1);
}
buffer_write_bytes(buffer, (const char*)&length, 4);
if (subtype != 2) {
buffer_write_bytes(buffer, &subtype, 1);
}
buffer_write_bytes(buffer, RSTRING_PTR(string_data), length);
break;
}
if (strcmp(cls, "Mongo::ObjectID") == 0) {
VALUE as_array = rb_funcall(value, rb_intern("to_a"), 0);
int i;
write_name_and_type(buffer, key, 0x07);
for (i = 0; i < 12; i++) {
char byte = (char)FIX2INT(RARRAY_PTR(as_array)[i]);
buffer_write_bytes(buffer, &byte, 1);
}
break;
}
if (strcmp(cls, "Mongo::DBRef") == 0) {
int start_position, length_location, obj_length;
VALUE ns, oid;
write_name_and_type(buffer, key, 0x03);
start_position = buffer->position;
// save space for length
length_location = buffer_save_bytes(buffer, 4);
ns = rb_funcall(value, rb_intern("namespace"), 0);
write_element(rb_str_new2("$ref"), ns, pack_extra(buffer, Qfalse));
oid = rb_funcall(value, rb_intern("object_id"), 0);
write_element(rb_str_new2("$id"), oid, pack_extra(buffer, Qfalse));
// write null byte and fill in length
buffer_write_bytes(buffer, &zero, 1);
obj_length = buffer->position - start_position;
memcpy(buffer->buffer + length_location, &obj_length, 4);
break;
}
}
case T_DATA:
{
// TODO again, is this really the only way to do this?
const char* cls = rb_class2name(RBASIC(value)->klass);
if (strcmp(cls, "Time") == 0) {
double t = NUM2DBL(rb_funcall(value, rb_intern("to_f"), 0));
long long time_since_epoch = (long long)round(t * 1000);
write_name_and_type(buffer, key, 0x09);
buffer_write_bytes(buffer, (const char*)&time_since_epoch, 8);
break;
}
}
case T_REGEXP:
{
int length = RREGEXP_SRC_LEN(value);
char* pattern = (char*)RREGEXP_SRC_PTR(value);
long flags = RREGEXP(value)->ptr->options;
VALUE has_extra;
write_name_and_type(buffer, key, 0x0B);
buffer_write_bytes(buffer, pattern, length);
buffer_write_bytes(buffer, &zero, 1);
if (flags & IGNORECASE) {
char ignorecase = 'i';
buffer_write_bytes(buffer, &ignorecase, 1);
}
if (flags & MULTILINE) {
char multiline = 'm';
buffer_write_bytes(buffer, &multiline, 1);
}
if (flags & EXTENDED) {
char extended = 'x';
buffer_write_bytes(buffer, &extended, 1);
}
has_extra = rb_funcall(value, rb_intern("respond_to?"), 1, rb_str_new2("extra_options_str"));
if (TYPE(has_extra) == T_TRUE) {
VALUE extra = rb_funcall(value, rb_intern("extra_options_str"), 0);
int old_position = buffer->position;
buffer_write_bytes(buffer, RSTRING_PTR(extra), RSTRING_LEN(extra));
qsort(buffer->buffer + old_position, RSTRING_LEN(extra), sizeof(char), cmp_char);
}
buffer_write_bytes(buffer, &zero, 1);
break;
}
default:
{
rb_raise(rb_eTypeError, "no c encoder for this type yet (%d)", TYPE(value));
break;
}
}
return ST_CONTINUE;
}
static int write_element(VALUE key, VALUE value, VALUE extra) {
return write_element_allow_id(key, value, extra, 0);
}
static void write_doc(bson_buffer* buffer, VALUE hash, VALUE check_keys) {
int start_position = buffer->position;
int length_location = buffer_save_bytes(buffer, 4);
int length;
VALUE id_str = rb_str_new2("_id");
VALUE id_sym = ID2SYM(rb_intern("_id"));
if (rb_funcall(hash, rb_intern("has_key?"), 1, id_str) == Qtrue) {
VALUE id = rb_hash_aref(hash, id_str);
write_element_allow_id(id_str, id, pack_extra(buffer, check_keys), 1);
} else if (rb_funcall(hash, rb_intern("has_key?"), 1, id_sym) == Qtrue) {
VALUE id = rb_hash_aref(hash, id_sym);
write_element_allow_id(id_sym, id, pack_extra(buffer, check_keys), 1);
}
// we have to check for an OrderedHash and handle that specially
if (strcmp(rb_class2name(RBASIC(hash)->klass), "OrderedHash") == 0) {
VALUE keys = rb_funcall(hash, rb_intern("keys"), 0);
int i;
for(i = 0; i < RARRAY_LEN(keys); i++) {
VALUE key = RARRAY_PTR(keys)[i];
VALUE value = rb_hash_aref(hash, key);
write_element(key, value, pack_extra(buffer, check_keys));
}
} else {
rb_hash_foreach(hash, write_element, pack_extra(buffer, check_keys));
}
// write null byte and fill in length
buffer_write_bytes(buffer, &zero, 1);
length = buffer->position - start_position;
memcpy(buffer->buffer + length_location, &length, 4);
}
static VALUE method_serialize(VALUE self, VALUE doc, VALUE check_keys) {
VALUE result;
bson_buffer* buffer = buffer_new();
assert(buffer);
write_doc(buffer, doc, check_keys);
result = rb_str_new(buffer->buffer, buffer->position);
buffer_free(buffer);
return result;
}
static VALUE get_value(const char* buffer, int* position, int type) {
VALUE value;
switch (type) {
case 1:
{
double d;
memcpy(&d, buffer + *position, 8);
value = rb_float_new(d);
*position += 8;
break;
}
case 2:
case 13:
{
int value_length;
*position += 4;
value_length = strlen(buffer + *position);
value = STR_NEW(buffer + *position, value_length);
*position += value_length + 1;
break;
}
case 3:
{
int size;
memcpy(&size, buffer + *position, 4);
if (strcmp(buffer + *position + 5, "$ref") == 0) { // DBRef
int offset = *position + 14;
VALUE argv[2];
int collection_length = strlen(buffer + offset);
char id_type;
argv[0] = STR_NEW(buffer + offset, collection_length);
offset += collection_length + 1;
id_type = buffer[offset];
offset += 5;
argv[1] = get_value(buffer, &offset, (int)id_type);
value = rb_class_new_instance(2, argv, DBRef);
} else {
value = elements_to_hash(buffer + *position + 4, size - 5);
}
*position += size;
break;
}
case 4:
{
int size, end;
memcpy(&size, buffer + *position, 4);
end = *position + size - 1;
*position += 4;
value = rb_ary_new();
while (*position < end) {
int type = (int)buffer[(*position)++];
int key_size = strlen(buffer + *position);
VALUE to_append;
*position += key_size + 1; // just skip the key, they're in order.
to_append = get_value(buffer, position, type);
rb_ary_push(value, to_append);
}
(*position)++;
break;
}
case 5:
{
int length, subtype;
VALUE data, st;
VALUE argv[2];
memcpy(&length, buffer + *position, 4);
subtype = (unsigned char)buffer[*position + 4];
if (subtype == 2) {
data = rb_str_new(buffer + *position + 9, length - 4);
} else {
data = rb_str_new(buffer + *position + 5, length);
}
st = INT2FIX(subtype);
argv[0] = data;
argv[1] = st;
value = rb_class_new_instance(2, argv, Binary);
*position += length + 5;
break;
}
case 6:
{
value = Qnil;
break;
}
case 7:
{
VALUE str = rb_str_new(buffer + *position, 12);
VALUE oid = rb_funcall(str, rb_intern("unpack"), 1, rb_str_new2("C*"));
value = rb_class_new_instance(1, &oid, ObjectID);
*position += 12;
break;
}
case 8:
{
value = buffer[(*position)++] ? Qtrue : Qfalse;
break;
}
case 9:
{
long long millis;
VALUE seconds, microseconds;
memcpy(&millis, buffer + *position, 8);
seconds = INT2NUM(millis / 1000);
microseconds = INT2NUM((millis % 1000) * 1000);
value = rb_funcall(Time, rb_intern("at"), 2, seconds, microseconds);
value = rb_funcall(value, rb_intern("utc"), 0);
*position += 8;
break;
}
case 10:
{
value = Qnil;
break;
}
case 11:
{
int pattern_length = strlen(buffer + *position);
VALUE pattern = STR_NEW(buffer + *position, pattern_length);
int flags_length, flags = 0, i = 0;
char extra[10];
VALUE argv[3];
*position += pattern_length + 1;
flags_length = strlen(buffer + *position);
extra[0] = 0;
for (i = 0; i < flags_length; i++) {
char flag = buffer[*position + i];
if (flag == 'i') {
flags |= IGNORECASE;
}
else if (flag == 'm') {
flags |= MULTILINE;
}
else if (flag == 'x') {
flags |= EXTENDED;
}
else if (strlen(extra) < 9) {
strncat(extra, &flag, 1);
}
}
argv[0] = pattern;
argv[1] = INT2FIX(flags);
argv[2] = rb_str_new2(extra);
value = rb_class_new_instance(3, argv, RegexpOfHolding);
*position += flags_length + 1;
break;
}
case 12:
{
int collection_length;
VALUE collection, str, oid, id, argv[2];
*position += 4;
collection_length = strlen(buffer + *position);
collection = STR_NEW(buffer + *position, collection_length);
*position += collection_length + 1;
str = rb_str_new(buffer + *position, 12);
oid = rb_funcall(str, rb_intern("unpack"), 1, rb_str_new2("C*"));
id = rb_class_new_instance(1, &oid, ObjectID);
*position += 12;
argv[0] = collection;
argv[1] = id;
value = rb_class_new_instance(2, argv, DBRef);
break;
}
case 14:
{
int value_length;
memcpy(&value_length, buffer + *position, 4);
value = ID2SYM(rb_intern(buffer + *position + 4));
*position += value_length + 4;
break;
}
case 15:
{
int code_length, scope_size;
VALUE code, scope, argv[2];
*position += 8;
code_length = strlen(buffer + *position);
code = STR_NEW(buffer + *position, code_length);
*position += code_length + 1;
memcpy(&scope_size, buffer + *position, 4);
scope = elements_to_hash(buffer + *position + 4, scope_size - 5);
*position += scope_size;
argv[0] = code;
argv[1] = scope;
value = rb_class_new_instance(2, argv, Code);
break;
}
case 16:
{
int i;
memcpy(&i, buffer + *position, 4);
value = LL2NUM(i);
*position += 4;
break;
}
case 17:
{
int i;
int j;
memcpy(&i, buffer + *position, 4);
memcpy(&j, buffer + *position + 4, 4);
value = rb_ary_new3(2, LL2NUM(i), LL2NUM(j));
*position += 8;
break;
}
case 18:
{
long long ll;
memcpy(&ll, buffer + *position, 8);
value = LL2NUM(ll);
*position += 8;
break;
}
default:
{
rb_raise(rb_eTypeError, "no c decoder for this type yet (%d)", type);
break;
}
}
return value;
}
static VALUE elements_to_hash(const char* buffer, int max) {
VALUE hash = rb_class_new_instance(0, NULL, OrderedHash);
int position = 0;
while (position < max) {
int type = (int)buffer[position++];
int name_length = strlen(buffer + position);
VALUE name = STR_NEW(buffer + position, name_length);
VALUE value;
position += name_length + 1;
value = get_value(buffer, &position, type);
rb_funcall(hash, rb_intern("[]="), 2, name, value);
}
return hash;
}
static VALUE method_deserialize(VALUE self, VALUE bson) {
const char* buffer = RSTRING_PTR(bson);
int remaining = RSTRING_LEN(bson);
// NOTE we just swallow the size and end byte here
buffer += 4;
remaining -= 5;
return elements_to_hash(buffer, remaining);
}
static VALUE fast_pack(VALUE self)
{
VALUE res;
long i;
char c;
res = rb_str_buf_new(0);
for (i = 0; i < RARRAY(self)->len; i++) {
c = FIX2LONG(RARRAY(self)->ptr[i]);
rb_str_buf_cat(res, &c, sizeof(char));
}
return res;
}
static VALUE objectid_generate(VALUE self)
{
VALUE ary, digest, hostname;
unsigned char *string;
unsigned long t, pid, inc;
int i;
string = ALLOC_N(unsigned char, 13);
hostname = rb_str_buf_new(64);
t = htonl(time(NULL));
MEMCPY(string, &t, char, 4);
gethostname(RSTRING(hostname)->ptr, 64);
RSTRING(hostname)->len = strlen(RSTRING(hostname)->ptr);
digest = rb_funcall(DigestMD5, rb_intern("hexdigest"), 1, hostname);
MEMCPY(string+4, RSTRING(digest)->ptr, unsigned char, 3);
pid = htonl(getpid());
MEMCPY(string+7, &pid, char, 2);
inc = htonl(FIX2ULONG(rb_funcall(self, rb_intern("get_inc"), 0)));
MEMCPY(string+9, ((unsigned char*)&inc + 1), unsigned char, 3);
ary = rb_ary_new2(12);
for(i = 0; i < 12; i++)
rb_ary_store(ary, i, INT2FIX((unsigned int)string[i]));
free(string);
return ary;
}
void Init_cbson() {
VALUE mongo, CBson, Digest;
Time = rb_const_get(rb_cObject, rb_intern("Time"));
mongo = rb_const_get(rb_cObject, rb_intern("Mongo"));
rb_require("mongo/types/binary");
Binary = rb_const_get(mongo, rb_intern("Binary"));
rb_require("mongo/types/objectid");
ObjectID = rb_const_get(mongo, rb_intern("ObjectID"));
rb_require("mongo/types/dbref");
DBRef = rb_const_get(mongo, rb_intern("DBRef"));
rb_require("mongo/types/code");
Code = rb_const_get(mongo, rb_intern("Code"));
rb_require("mongo/types/regexp_of_holding");
RegexpOfHolding = rb_const_get(mongo, rb_intern("RegexpOfHolding"));
rb_require("mongo/errors");
InvalidName = rb_const_get(mongo, rb_intern("InvalidName"));
rb_require("mongo/util/ordered_hash");
OrderedHash = rb_const_get(rb_cObject, rb_intern("OrderedHash"));
CBson = rb_define_module("CBson");
rb_define_module_function(CBson, "serialize", method_serialize, 2);
rb_define_module_function(CBson, "deserialize", method_deserialize, 1);
rb_require("digest/md5");
Digest = rb_const_get(rb_cObject, rb_intern("Digest"));
DigestMD5 = rb_const_get(Digest, rb_intern("MD5"));
rb_define_method(ObjectID, "generate", objectid_generate, 0);
rb_define_method(rb_cArray, "fast_pack", fast_pack, 0);
}
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