674 lines
22 KiB
C
674 lines
22 KiB
C
/*
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* Copyright 2009 10gen, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* This file contains C implementations of some of the functions needed by the
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* bson module. If possible, these implementations should be used to speed up
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* BSON encoding and decoding.
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*/
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#include "ruby.h"
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#include "ruby/st.h"
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#include "ruby/regex.h"
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#include <assert.h>
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#define INITIAL_BUFFER_SIZE 256
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static VALUE Binary;
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static VALUE Undefined;
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static VALUE Time;
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static VALUE ObjectID;
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static VALUE DBRef;
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static VALUE Code;
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static VALUE RegexpOfHolding;
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static VALUE OrderedHash;
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// this sucks. but for some reason these moved around between 1.8 and 1.9
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#ifdef ONIGURUMA_H
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#define IGNORECASE ONIG_OPTION_IGNORECASE
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#define MULTILINE ONIG_OPTION_MULTILINE
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#define EXTENDED ONIG_OPTION_EXTEND
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#else
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#define IGNORECASE RE_OPTION_IGNORECASE
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#define MULTILINE RE_OPTION_MULTILINE
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#define EXTENDED RE_OPTION_EXTENDED
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#endif
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// this sucks too.
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#ifndef RREGEXP_SRC_PTR
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#define RREGEXP_SRC_PTR(r) RREGEXP(r)->str
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#define RREGEXP_SRC_LEN(r) RREGEXP(r)->len
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#endif
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typedef struct {
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char* buffer;
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int size;
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int position;
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} bson_buffer;
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static char zero = 0;
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static char one = 1;
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static int cmp_char(const void* a, const void* b) {
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return *(char*)a - *(char*)b;
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}
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static void write_doc(bson_buffer* buffer, VALUE hash);
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static int write_element(VALUE key, VALUE value, VALUE extra);
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static VALUE elements_to_hash(const char* buffer, int max);
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static bson_buffer* buffer_new(void) {
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bson_buffer* buffer;
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buffer = ALLOC(bson_buffer);
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assert(buffer);
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buffer->size = INITIAL_BUFFER_SIZE;
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buffer->position = 0;
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buffer->buffer = ALLOC_N(char, INITIAL_BUFFER_SIZE);
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assert(buffer->buffer);
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return buffer;
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}
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static void buffer_free(bson_buffer* buffer) {
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assert(buffer);
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assert(buffer->buffer);
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free(buffer->buffer);
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free(buffer);
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}
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static void buffer_resize(bson_buffer* buffer, int min_length) {
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int size = buffer->size;
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if (size >= min_length) {
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return;
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}
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while (size < min_length) {
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size *= 2;
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}
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buffer->buffer = REALLOC_N(buffer->buffer, char, size);
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assert(buffer->buffer);
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buffer->size = size;
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}
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static void buffer_assure_space(bson_buffer* buffer, int size) {
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if (buffer->position + size <= buffer->size) {
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return;
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}
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buffer_resize(buffer, buffer->position + size);
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}
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/* returns offset for writing */
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static int buffer_save_bytes(bson_buffer* buffer, int size) {
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buffer_assure_space(buffer, size);
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int position = buffer->position;
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buffer->position += size;
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return position;
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}
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static void buffer_write_bytes(bson_buffer* buffer, const char* bytes, int size) {
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buffer_assure_space(buffer, size);
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memcpy(buffer->buffer + buffer->position, bytes, size);
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buffer->position += size;
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}
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static void write_name_and_type(bson_buffer* buffer, VALUE name, char type) {
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buffer_write_bytes(buffer, &type, 1);
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buffer_write_bytes(buffer, RSTRING_PTR(name), RSTRING_LEN(name));
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buffer_write_bytes(buffer, &zero, 1);
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}
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static int write_element_allow_id(VALUE key, VALUE value, VALUE extra, int allow_id) {
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bson_buffer* buffer = (bson_buffer*)extra;
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if (TYPE(key) == T_SYMBOL) {
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// TODO better way to do this... ?
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key = rb_str_new2(rb_id2name(SYM2ID(key)));
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}
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if (TYPE(key) != T_STRING) {
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rb_raise(rb_eTypeError, "keys must be strings or symbols");
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}
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if (!allow_id && strcmp("_id", RSTRING_PTR(key)) == 0) {
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return ST_CONTINUE;
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}
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switch(TYPE(value)) {
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case T_BIGNUM:
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{
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write_name_and_type(buffer, key, 0x10);
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VALUE as_f = rb_funcall(value, rb_intern("to_f"), 0);
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int int_value = NUM2LL(as_f);
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buffer_write_bytes(buffer, (char*)&int_value, 4);
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break;
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}
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case T_FIXNUM:
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{
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write_name_and_type(buffer, key, 0x10);
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int int_value = FIX2INT(value);
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buffer_write_bytes(buffer, (char*)&int_value, 4);
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break;
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}
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case T_TRUE:
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{
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write_name_and_type(buffer, key, 0x08);
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buffer_write_bytes(buffer, &one, 1);
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break;
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}
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case T_FALSE:
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{
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write_name_and_type(buffer, key, 0x08);
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buffer_write_bytes(buffer, &zero, 1);
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break;
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}
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case T_FLOAT:
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{
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write_name_and_type(buffer, key, 0x01);
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double d = NUM2DBL(value);
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buffer_write_bytes(buffer, (char*)&d, 8);
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break;
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}
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case T_NIL:
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{
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write_name_and_type(buffer, key, 0x0A);
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break;
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}
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case T_HASH:
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{
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write_name_and_type(buffer, key, 0x03);
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write_doc(buffer, value);
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break;
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}
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case T_ARRAY:
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{
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write_name_and_type(buffer, key, 0x04);
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int start_position = buffer->position;
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// save space for length
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int length_location = buffer_save_bytes(buffer, 4);
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int items = RARRAY_LEN(value);
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VALUE* values = RARRAY_PTR(value);
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int i;
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for(i = 0; i < items; i++) {
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char* name;
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asprintf(&name, "%d", i);
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VALUE key = rb_str_new2(name);
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write_element(key, values[i], (VALUE)buffer);
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free(name);
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}
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// write null byte and fill in length
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buffer_write_bytes(buffer, &zero, 1);
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int obj_length = buffer->position - start_position;
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memcpy(buffer->buffer + length_location, &obj_length, 4);
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break;
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}
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case T_STRING:
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{
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if (strcmp(rb_class2name(RBASIC(value)->klass),
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"XGen::Mongo::Driver::Code") == 0) {
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write_name_and_type(buffer, key, 0x0F);
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int start_position = buffer->position;
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int length_location = buffer_save_bytes(buffer, 4);
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int length = RSTRING_LEN(value) + 1;
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buffer_write_bytes(buffer, (char*)&length, 4);
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buffer_write_bytes(buffer, RSTRING_PTR(value), length - 1);
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buffer_write_bytes(buffer, &zero, 1);
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write_doc(buffer, rb_funcall(value, rb_intern("scope"), 0));
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int total_length = buffer->position - start_position;
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memcpy(buffer->buffer + length_location, &total_length, 4);
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break;
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} else {
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write_name_and_type(buffer, key, 0x02);
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int length = RSTRING_LEN(value) + 1;
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buffer_write_bytes(buffer, (char*)&length, 4);
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buffer_write_bytes(buffer, RSTRING_PTR(value), length - 1);
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buffer_write_bytes(buffer, &zero, 1);
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break;
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}
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}
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case T_SYMBOL:
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{
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write_name_and_type(buffer, key, 0x0E);
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const char* str_value = rb_id2name(SYM2ID(value));
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int length = strlen(str_value) + 1;
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buffer_write_bytes(buffer, (char*)&length, 4);
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buffer_write_bytes(buffer, str_value, length);
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break;
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}
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case T_OBJECT:
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{
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// TODO there has to be a better way to do these checks...
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const char* cls = rb_class2name(RBASIC(value)->klass);
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if (strcmp(cls, "XGen::Mongo::Driver::Binary") == 0 ||
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strcmp(cls, "ByteBuffer") == 0) {
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write_name_and_type(buffer, key, 0x05);
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const char subtype = strcmp(cls, "ByteBuffer") ?
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(const char)FIX2INT(rb_funcall(value, rb_intern("subtype"), 0)) : 2;
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VALUE string_data = rb_funcall(value, rb_intern("to_s"), 0);
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int length = RSTRING_LEN(string_data);
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if (subtype == 2) {
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const int other_length = length + 4;
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buffer_write_bytes(buffer, (const char*)&other_length, 4);
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buffer_write_bytes(buffer, &subtype, 1);
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}
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buffer_write_bytes(buffer, (const char*)&length, 4);
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if (subtype != 2) {
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buffer_write_bytes(buffer, &subtype, 1);
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}
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buffer_write_bytes(buffer, RSTRING_PTR(string_data), length);
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break;
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}
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if (strcmp(cls, "XGen::Mongo::Driver::ObjectID") == 0) {
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write_name_and_type(buffer, key, 0x07);
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VALUE as_array = rb_funcall(value, rb_intern("to_a"), 0);
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int i;
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for (i = 0; i < 12; i++) {
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char byte = (char)FIX2INT(RARRAY_PTR(as_array)[i]);
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buffer_write_bytes(buffer, &byte, 1);
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}
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break;
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}
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if (strcmp(cls, "XGen::Mongo::Driver::DBRef") == 0) {
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write_name_and_type(buffer, key, 0x03);
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int start_position = buffer->position;
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// save space for length
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int length_location = buffer_save_bytes(buffer, 4);
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VALUE ns = rb_funcall(value, rb_intern("namespace"), 0);
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write_element(rb_str_new2("$ref"), ns, (VALUE)buffer);
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VALUE oid = rb_funcall(value, rb_intern("object_id"), 0);
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write_element(rb_str_new2("$id"), oid, (VALUE)buffer);
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// write null byte and fill in length
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buffer_write_bytes(buffer, &zero, 1);
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int obj_length = buffer->position - start_position;
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memcpy(buffer->buffer + length_location, &obj_length, 4);
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break;
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}
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if (strcmp(cls, "XGen::Mongo::Driver::Undefined") == 0) {
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write_name_and_type(buffer, key, 0x06);
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break;
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}
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}
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case T_DATA:
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{
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// TODO again, is this really the only way to do this?
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const char* cls = rb_class2name(RBASIC(value)->klass);
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if (strcmp(cls, "Time") == 0) {
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write_name_and_type(buffer, key, 0x09);
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double t = NUM2DBL(rb_funcall(value, rb_intern("to_f"), 0));
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long long time_since_epoch = (long long)(t * 1000);
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buffer_write_bytes(buffer, (const char*)&time_since_epoch, 8);
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break;
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}
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}
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case T_REGEXP:
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{
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write_name_and_type(buffer, key, 0x0B);
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int length = RREGEXP_SRC_LEN(value);
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char* pattern = (char*)RREGEXP_SRC_PTR(value);
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buffer_write_bytes(buffer, pattern, length);
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buffer_write_bytes(buffer, &zero, 1);
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long flags = RREGEXP(value)->ptr->options;
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if (flags & IGNORECASE) {
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char ignorecase = 'i';
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buffer_write_bytes(buffer, &ignorecase, 1);
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}
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if (flags & MULTILINE) {
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char multiline = 'm';
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buffer_write_bytes(buffer, &multiline, 1);
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}
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if (flags & EXTENDED) {
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char extended = 'x';
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buffer_write_bytes(buffer, &extended, 1);
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}
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VALUE has_extra = rb_funcall(value, rb_intern("respond_to?"), 1, rb_str_new2("extra_options_str"));
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if (TYPE(has_extra) == T_TRUE) {
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VALUE extra = rb_funcall(value, rb_intern("extra_options_str"), 0);
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int old_position = buffer->position;
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buffer_write_bytes(buffer, RSTRING_PTR(extra), RSTRING_LEN(extra));
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qsort(buffer->buffer + old_position, RSTRING_LEN(extra), sizeof(char), cmp_char);
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}
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buffer_write_bytes(buffer, &zero, 1);
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break;
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}
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default:
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{
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rb_raise(rb_eTypeError, "no c encoder for this type yet (%d)", TYPE(value));
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break;
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}
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}
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return ST_CONTINUE;
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}
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static int write_element(VALUE key, VALUE value, VALUE extra) {
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return write_element_allow_id(key, value, extra, 0);
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}
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static void write_doc(bson_buffer* buffer, VALUE hash) {
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int start_position = buffer->position;
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int length_location = buffer_save_bytes(buffer, 4);
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VALUE key = rb_str_new2("_id");
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VALUE id = rb_hash_aref(hash, key);
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if (TYPE(id) != T_NIL) {
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write_element_allow_id(key, id, (VALUE)buffer, 1);
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}
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key = ID2SYM(rb_intern("_id"));
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id = rb_hash_aref(hash, key);
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if (TYPE(id) != T_NIL) {
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write_element_allow_id(key, id, (VALUE)buffer, 1);
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}
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// we have to check for an OrderedHash and handle that specially
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if (strcmp(rb_class2name(RBASIC(hash)->klass), "OrderedHash") == 0) {
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VALUE keys = rb_funcall(hash, rb_intern("keys"), 0);
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int i;
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for(i = 0; i < RARRAY_LEN(keys); i++) {
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VALUE key = RARRAY_PTR(keys)[i];
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VALUE value = rb_hash_aref(hash, key);
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write_element(key, value, (VALUE)buffer);
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}
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} else {
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rb_hash_foreach(hash, write_element, (VALUE)buffer);
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}
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// write null byte and fill in length
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buffer_write_bytes(buffer, &zero, 1);
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int length = buffer->position - start_position;
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memcpy(buffer->buffer + length_location, &length, 4);
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}
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static VALUE method_serialize(VALUE self, VALUE doc) {
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bson_buffer* buffer = buffer_new();
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assert(buffer);
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write_doc(buffer, doc);
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VALUE result = rb_str_new(buffer->buffer, buffer->position);
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buffer_free(buffer);
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return result;
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}
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static VALUE get_value(const char* buffer, int* position, int type) {
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VALUE value;
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switch (type) {
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case 1:
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{
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double d;
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memcpy(&d, buffer + *position, 8);
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value = rb_float_new(d);
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*position += 8;
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break;
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}
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case 2:
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case 13:
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{
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*position += 4;
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int value_length = strlen(buffer + *position);
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value = rb_str_new(buffer+ *position, value_length);
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*position += value_length + 1;
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break;
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}
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case 3:
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{
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int size;
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memcpy(&size, buffer + *position, 4);
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if (strcmp(buffer + *position + 5, "$ref") == 0) { // DBRef
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int offset = *position + 14;
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VALUE argv[2];
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int collection_length = strlen(buffer + offset);
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argv[0] = rb_str_new(buffer + offset, collection_length);
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offset += collection_length + 1;
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char id_type = buffer[offset];
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offset += 5;
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argv[1] = get_value(buffer, &offset, (int)id_type);
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value = rb_class_new_instance(2, argv, DBRef);
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} else {
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value = elements_to_hash(buffer + *position + 4, size - 5);
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}
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*position += size;
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break;
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}
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case 4:
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{
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int size;
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memcpy(&size, buffer + *position, 4);
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int end = *position + size - 1;
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*position += 4;
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value = rb_ary_new();
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while (*position < end) {
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int type = (int)buffer[(*position)++];
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int key_size = strlen(buffer + *position);
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*position += key_size + 1; // just skip the key, they're in order.
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VALUE to_append = get_value(buffer, position, type);
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rb_ary_push(value, to_append);
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}
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(*position)++;
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break;
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}
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case 5:
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{
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int length;
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memcpy(&length, buffer + *position, 4);
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int subtype = (unsigned char)buffer[*position + 4];
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VALUE data;
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if (subtype == 2) {
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data = rb_str_new(buffer + *position + 9, length - 4);
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} else {
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data = rb_str_new(buffer + *position + 5, length);
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}
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VALUE st = INT2FIX(subtype);
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VALUE argv[2] = {data, st};
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value = rb_class_new_instance(2, argv, Binary);
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*position += length + 5;
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break;
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}
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case 6:
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{
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value = rb_class_new_instance(0, NULL, Undefined);
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break;
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}
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case 7:
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{
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VALUE str = rb_str_new(buffer + *position, 12);
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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;
|
|
memcpy(&millis, buffer + *position, 8);
|
|
VALUE seconds = INT2NUM(millis / 1000);
|
|
VALUE microseconds = INT2NUM((millis % 1000) * 1000);
|
|
|
|
value = rb_funcall(Time, rb_intern("at"), 2, seconds, microseconds);
|
|
*position += 8;
|
|
break;
|
|
}
|
|
case 10:
|
|
{
|
|
value = Qnil;
|
|
break;
|
|
}
|
|
case 11:
|
|
{
|
|
int pattern_length = strlen(buffer + *position);
|
|
VALUE pattern = rb_str_new(buffer + *position, pattern_length);
|
|
*position += pattern_length + 1;
|
|
|
|
int flags_length = strlen(buffer + *position);
|
|
int i = 0;
|
|
|
|
int flags = 0;
|
|
char extra[10];
|
|
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);
|
|
}
|
|
}
|
|
VALUE argv[3] = {
|
|
pattern,
|
|
INT2FIX(flags),
|
|
rb_str_new2(extra)
|
|
};
|
|
value = rb_class_new_instance(3, argv, RegexpOfHolding);
|
|
*position += flags_length + 1;
|
|
break;
|
|
}
|
|
case 12:
|
|
{
|
|
*position += 4;
|
|
int collection_length = strlen(buffer + *position);
|
|
VALUE collection = rb_str_new(buffer + *position, collection_length);
|
|
*position += collection_length + 1;
|
|
|
|
VALUE str = rb_str_new(buffer + *position, 12);
|
|
VALUE oid = rb_funcall(str, rb_intern("unpack"), 1, rb_str_new2("C*"));
|
|
VALUE id = rb_class_new_instance(1, &oid, ObjectID);
|
|
*position += 12;
|
|
|
|
VALUE argv[2] = {collection, 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:
|
|
{
|
|
*position += 8;
|
|
int code_length = strlen(buffer + *position);
|
|
VALUE code = rb_str_new(buffer + *position, code_length);
|
|
*position += code_length + 1;
|
|
|
|
int scope_size;
|
|
memcpy(&scope_size, buffer + *position, 4);
|
|
VALUE scope = elements_to_hash(buffer + *position + 4, scope_size - 5);
|
|
*position += scope_size;
|
|
|
|
VALUE argv[2] = {code, 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;
|
|
}
|
|
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 = rb_str_new(buffer + position, name_length);
|
|
position += name_length + 1;
|
|
VALUE 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);
|
|
}
|
|
|
|
void Init_cbson() {
|
|
Time = rb_const_get(rb_cObject, rb_intern("Time"));
|
|
|
|
VALUE driver = rb_const_get(rb_const_get(rb_const_get(rb_cObject,
|
|
rb_intern("XGen")),
|
|
rb_intern("Mongo")),
|
|
rb_intern("Driver"));
|
|
rb_require("mongo/types/binary");
|
|
Binary = rb_const_get(driver, rb_intern("Binary"));
|
|
rb_require("mongo/types/undefined");
|
|
Undefined = rb_const_get(driver, rb_intern("Undefined"));
|
|
rb_require("mongo/types/objectid");
|
|
ObjectID = rb_const_get(driver, rb_intern("ObjectID"));
|
|
rb_require("mongo/types/dbref");
|
|
DBRef = rb_const_get(driver, rb_intern("DBRef"));
|
|
rb_require("mongo/types/code");
|
|
Code = rb_const_get(driver, rb_intern("Code"));
|
|
rb_require("mongo/types/regexp_of_holding");
|
|
RegexpOfHolding = rb_const_get(driver, rb_intern("RegexpOfHolding"));
|
|
rb_require("mongo/util/ordered_hash");
|
|
OrderedHash = rb_const_get(rb_cObject, rb_intern("OrderedHash"));
|
|
|
|
VALUE CBson = rb_define_module("CBson");
|
|
rb_define_module_function(CBson, "serialize", method_serialize, 1);
|
|
rb_define_module_function(CBson, "deserialize", method_deserialize, 1);
|
|
}
|