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perl_mongo.c
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perl_mongo.c
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/*
* Copyright 2009-2013 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.
*/
#include "perl_mongo.h"
#include "mongo_link.h"
#ifdef WIN32
#include <memory.h>
#endif
#include "regcomp.h"
static stackette* check_circular_ref(void *ptr, stackette *stack);
static void serialize_regex(buffer*, const char*, REGEXP*, int is_insert);
static void serialize_regex_flags(buffer*, SV*);
static void append_sv (buffer *buf, const char *key, SV *sv, stackette *stack, int is_insert);
static void containsNullChar(const char* str, int len);
static SV *bson_to_sv (buffer *buf, char *dt_type, int inflate_dbrefs, SV *client);
#ifdef USE_ITHREADS
static perl_mutex inc_mutex;
#endif
static int perl_mongo_inc = 0;
int perl_mongo_machine_id;
static SV *utf8_flag_on;
static SV *use_binary;
static SV *use_boolean;
static SV *special_char;
static SV *look_for_numbers;
void perl_mongo_init() {
MUTEX_INIT(&inc_mutex);
utf8_flag_on = get_sv("MongoDB::BSON::utf8_flag_on", 0);
use_binary = get_sv("MongoDB::BSON::use_binary", 0);
use_boolean = get_sv("MongoDB::BSON::use_boolean", 0);
special_char = get_sv("MongoDB::BSON::char", 0);
look_for_numbers = get_sv("MongoDB::BSON::looks_like_number", 0);
}
void
perl_mongo_call_xs (pTHX_ void (*subaddr) (pTHX_ CV *), CV *cv, SV **mark) {
dSP;
PUSHMARK (mark);
(*subaddr) (aTHX_ cv);
PUTBACK;
}
SV *
perl_mongo_call_reader (SV *self, const char *reader) {
dSP;
SV *ret;
I32 count;
ENTER;
SAVETMPS;
PUSHMARK (SP);
XPUSHs (self);
PUTBACK;
count = call_method (reader, G_SCALAR);
SPAGAIN;
if (count != 1) {
croak ("reader didn't return a value");
}
ret = POPs;
SvREFCNT_inc (ret);
PUTBACK;
FREETMPS;
LEAVE;
return ret;
}
SV *
perl_mongo_call_method (SV *self, const char *method, I32 flags, int num, ...) {
dSP;
SV *ret = NULL;
I32 count;
va_list args;
if (flags & G_ARRAY) {
croak("perl_mongo_call_method doesn't support list context");
}
ENTER;
SAVETMPS;
PUSHMARK (SP);
XPUSHs (self);
va_start( args, num );
for( ; num > 0; num-- ) {
XPUSHs (va_arg( args, SV* ));
}
va_end( args );
PUTBACK;
count = call_method (method, flags | G_SCALAR);
if (!(flags & G_DISCARD)) {
SPAGAIN;
if (count != 1) {
croak ("method didn't return a value");
}
ret = POPs;
SvREFCNT_inc (ret);
}
PUTBACK;
FREETMPS;
LEAVE;
return ret;
}
SV *
perl_mongo_call_function (const char *func, int num, ...) {
dSP;
SV *ret;
I32 count;
va_list args;
ENTER;
SAVETMPS;
PUSHMARK (SP);
va_start( args, num );
for( ; num > 0; num-- ) {
XPUSHs (va_arg( args, SV* ));
}
va_end( args );
PUTBACK;
count = call_pv (func, G_SCALAR);
SPAGAIN;
if (count != 1) {
croak ("method didn't return a value");
}
ret = POPs;
SvREFCNT_inc (ret);
PUTBACK;
FREETMPS;
LEAVE;
return ret;
}
static int perl_mongo_regex_flags( char *flags_ptr, SV *re ) {
dSP;
ENTER;
SAVETMPS;
PUSHMARK (SP);
XPUSHs (re);
PUTBACK;
int ret_count = call_pv( "re::regexp_pattern", G_ARRAY );
SPAGAIN;
if ( ret_count != 2 ) {
croak( "error introspecting regex" );
}
// regexp_pattern returns two items (in list context), the pattern and a list of flags
SV *flags_sv = POPs;
SV *pat_sv = POPs;
char *flags = SvPVutf8_nolen(flags_sv);
strncpy( flags_ptr, flags, 7 );
}
void
perl_mongo_attach_ptr_to_instance (SV *self, void *ptr, MGVTBL *vtbl)
{
MAGIC *mg;
mg = sv_magicext (SvRV (self), 0, PERL_MAGIC_ext, vtbl, (const char *)ptr, 0);
mg->mg_flags |= MGf_DUP;
}
void *
perl_mongo_get_ptr_from_instance (SV *self, MGVTBL *vtbl)
{
MAGIC *mg;
if (!self || !SvOK (self) || !SvROK (self) || !sv_isobject (self)) {
croak ("not an object");
}
for (mg = SvMAGIC (SvRV (self)); mg; mg = mg->mg_moremagic) {
if (mg->mg_type == PERL_MAGIC_ext && mg->mg_virtual == vtbl)
return mg->mg_ptr;
}
croak ("invalid object");
}
SV *
perl_mongo_construct_instance (const char *klass, ...)
{
SV *ret;
va_list ap;
va_start (ap, klass);
ret = perl_mongo_construct_instance_va (klass, ap);
va_end(ap);
return ret;
}
SV *
perl_mongo_construct_instance_va (const char *klass, va_list ap)
{
dSP;
SV *ret;
I32 count;
char *init_arg;
ENTER;
SAVETMPS;
PUSHMARK (SP);
mXPUSHp (klass, strlen (klass));
while ((init_arg = va_arg (ap, char *))) {
mXPUSHp (init_arg, strlen (init_arg));
XPUSHs (va_arg (ap, SV *));
}
PUTBACK;
count = call_method ("new", G_SCALAR);
SPAGAIN;
if (count != 1) {
croak ("constructor didn't return an instance");
}
ret = POPs;
SvREFCNT_inc (ret);
PUTBACK;
FREETMPS;
LEAVE;
return ret;
}
SV *
perl_mongo_construct_instance_with_magic (const char *klass, void *ptr, MGVTBL *vtbl, ...)
{
SV *ret;
va_list ap;
va_start (ap, vtbl);
ret = perl_mongo_construct_instance_va (klass, ap);
va_end (ap);
perl_mongo_attach_ptr_to_instance (ret, ptr, vtbl);
return ret;
}
static SV *bson_to_av (buffer *buf, char *dt_type, int inflate_dbrefs, SV *client );
void perl_mongo_make_oid(char *twelve, char *twenty4) {
static char ra_hex[] = "0123456789abcdef";
unsigned int x;
int i;
for(i=0; i<12; i++) {
x = *(unsigned char *)twelve++;
*twenty4++ = ra_hex[x >> 4];
*twenty4++ = ra_hex[x & 0x0f];
}
*twenty4++ = '\0';
}
static SV *
oid_to_sv (buffer *buf)
{
HV *stash, *id_hv;
char oid_s[25];
perl_mongo_make_oid(buf->pos, oid_s);
id_hv = newHV();
(void)hv_stores(id_hv, "value", newSVpvn(oid_s, 24));
stash = gv_stashpv("MongoDB::OID", 0);
return sv_bless(newRV_noinc((SV *)id_hv), stash);
}
static SV *
elem_to_sv (int type, buffer *buf, char *dt_type, int inflate_dbrefs, SV *client )
{
SV *value = 0;
switch(type) {
case BSON_OID: {
value = oid_to_sv(buf);
buf->pos += OID_SIZE;
break;
}
case BSON_DOUBLE: {
double d;
#if MONGO_BIG_ENDIAN
int64_t i = MONGO_64p(buf->pos);
memcpy(&d, &i, DOUBLE_64);
#else
memcpy(&d, buf->pos, DOUBLE_64);
#endif
value = newSVnv(d);
buf->pos += DOUBLE_64;
break;
}
case BSON_SYMBOL:
case BSON_STRING: {
int len = MONGO_32p(buf->pos);
buf->pos += INT_32;
// this makes a copy of the buffer
// len includes \0
value = newSVpvn(buf->pos, len-1);
if (!utf8_flag_on || !SvIOK(utf8_flag_on) || SvIV(utf8_flag_on) != 0) {
SvUTF8_on(value);
}
buf->pos += len;
break;
}
case BSON_OBJECT: {
value = bson_to_sv(buf, dt_type, inflate_dbrefs, client );
break;
}
case BSON_ARRAY: {
value = bson_to_av(buf, dt_type, inflate_dbrefs, client );
break;
}
case BSON_BINARY: {
int len = MONGO_32p(buf->pos);
unsigned char type;
buf->pos += INT_32;
// we should do something with type
type = *buf->pos++;
if (type == SUBTYPE_BINARY_DEPRECATED) {
int len2 = MONGO_32p(buf->pos);
if (len2 == len - 4) {
len = len2;
buf->pos += INT_32;
}
}
if (use_binary && SvTRUE(use_binary)) {
SV *data = sv_2mortal(newSVpvn(buf->pos, len));
SV *subtype = sv_2mortal(newSViv(type));
value = perl_mongo_construct_instance("MongoDB::BSON::Binary", "data", data, "subtype", subtype, NULL);
}
else {
value = newSVpvn(buf->pos, len);
}
buf->pos += len;
break;
}
case BSON_BOOL: {
dSP;
char d = *buf->pos++;
int count;
if (!use_boolean) {
value = newSViv(d);
break;
}
SAVETMPS;
PUSHMARK(SP);
PUTBACK;
if (d) {
count = call_pv("boolean::true", G_SCALAR);
}
else {
count = call_pv("boolean::false", G_SCALAR);
}
SPAGAIN;
if (count == 1)
value = newSVsv(POPs);
if (count != 1 || !SvOK(value)) {
value = newSViv(d);
}
PUTBACK;
FREETMPS;
break;
}
case BSON_UNDEF:
case BSON_NULL: {
value = newSV(0);
break;
}
case BSON_INT: {
value = newSViv(MONGO_32p(buf->pos));
buf->pos += INT_32;
break;
}
case BSON_LONG: {
#if defined(USE_64_BIT_INT)
value = newSViv(MONGO_64p(buf->pos));
#else
value = newSVnv((double)MONGO_64p(buf->pos));
#endif
buf->pos += INT_64;
break;
}
case BSON_DATE: {
double ms_i = (double)MONGO_64p(buf->pos);
SV *datetime, *ms, **heval;
HV *named_params;
buf->pos += INT_64;
ms_i /= 1000.0;
if ( dt_type == NULL ) {
// raw epoch
value = newSViv(ms_i);
} else if ( strcmp( dt_type, "DateTime::Tiny" ) == 0 ) {
datetime = sv_2mortal(newSVpv("DateTime::Tiny", 0));
time_t epoch = (time_t)ms_i;
struct tm *dt = gmtime( &epoch );
value =
perl_mongo_call_function("DateTime::Tiny::new", 13, datetime,
newSVpvs("year"),
newSViv( dt->tm_year + 1900 ),
newSVpvs("month"),
newSViv( dt->tm_mon + 1 ),
newSVpvs("day"),
newSViv( dt->tm_mday ),
newSVpvs("hour"),
newSViv( dt->tm_hour ),
newSVpvs("minute"),
newSViv( dt->tm_min ),
newSVpvs("second"),
newSViv( dt->tm_sec )
);
} else if ( strcmp( dt_type, "DateTime" ) == 0 ) {
datetime = sv_2mortal(newSVpv("DateTime", 0));
ms = newSVnv(ms_i);
named_params = newHV();
heval = hv_stores(named_params, "epoch", ms);
value = perl_mongo_call_function("DateTime::from_epoch", 2, datetime,
sv_2mortal(newRV_inc(sv_2mortal((SV*)named_params))));
} else {
croak( "Invalid dt_type \"%s\"", dt_type );
}
break;
}
case BSON_REGEX: {
SV *pattern, *regex_ref;
#if PERL_REVISION==5 && PERL_VERSION<12
SV *regex;
#endif
HV *stash;
U32 flags = 0;
REGEXP *re;
#if PERL_REVISION==5 && PERL_VERSION<=8
PMOP pm;
STRLEN len;
char *pat;
#endif
pattern = sv_2mortal(newSVpv(buf->pos, 0));
buf->pos += strlen(buf->pos)+1;
while(*(buf->pos) != 0) {
switch(*(buf->pos)) {
case 'l':
#if PERL_REVISION==5 && PERL_VERSION<=12
flags |= PMf_LOCALE;
#else
set_regex_charset(&flags, REGEX_LOCALE_CHARSET);
#endif
break;
case 'm':
flags |= PMf_MULTILINE;
break;
case 'i':
flags |= PMf_FOLD;
break;
case 'x':
flags |= PMf_EXTENDED;
break;
case 's':
flags |= PMf_SINGLELINE;
break;
}
buf->pos++;
}
buf->pos++;
#if PERL_REVISION==5 && PERL_VERSION<=8
/* 5.8 */
pm.op_pmdynflags = flags;
pat = SvPV(pattern, len);
re = pregcomp(pat, pat + len, &pm);
#else
/* 5.10 and beyond */
re = re_compile(pattern, flags);
#endif
// eo version-dependent code
#if PERL_REVISION==5 && PERL_VERSION>=12
// they removed magic and made this a normal obj in 5.12
regex_ref = newRV((SV*)re);
#else
regex = sv_2mortal(newSVpv("",0));
regex_ref = newRV((SV*)regex);
sv_magic(regex, (SV*)re, PERL_MAGIC_qr, 0, 0);
#endif
stash = gv_stashpv("Regexp", 0);
sv_bless(regex_ref, stash);
value = regex_ref;
break;
}
case BSON_CODE:
case BSON_CODE__D: {
SV *code, *scope;
int code_len;
if (type == BSON_CODE) {
buf->pos += INT_32;
}
code_len = MONGO_32p(buf->pos);
buf->pos += INT_32;
code = sv_2mortal(newSVpvn(buf->pos, code_len-1));
buf->pos += code_len;
if (type == BSON_CODE) {
scope = bson_to_sv(buf, dt_type, inflate_dbrefs, client );
value = perl_mongo_construct_instance("MongoDB::Code", "code", code, "scope", scope, NULL);
}
else {
value = perl_mongo_construct_instance("MongoDB::Code", "code", code, NULL);
}
break;
}
case BSON_TIMESTAMP: {
SV *sec_sv, *inc_sv;
int sec, inc;
inc = MONGO_32p(buf->pos);
buf->pos += INT_32;
sec = MONGO_32p(buf->pos);
buf->pos += INT_32;
sec_sv = sv_2mortal(newSViv(sec));
inc_sv = sv_2mortal(newSViv(inc));
value = perl_mongo_construct_instance("MongoDB::Timestamp", "sec", sec_sv, "inc", inc_sv, NULL);
break;
}
case BSON_MINKEY: {
HV *stash = gv_stashpv("MongoDB::MinKey", GV_ADD);
value = sv_bless(newRV((SV*)newHV()), stash);
break;
}
case BSON_MAXKEY: {
HV *stash = gv_stashpv("MongoDB::MaxKey", GV_ADD);
value = sv_bless(newRV((SV*)newHV()), stash);
break;
}
default: {
croak("type %d not supported\n", type);
// give up, it'll be trouble if we keep going
}
}
return value;
}
static SV *
bson_to_av (buffer *buf, char *dt_type, int inflate_dbrefs, SV *client )
{
AV *ret = newAV ();
char type;
// for size
buf->pos += INT_32;
while ((type = *buf->pos++) != 0) {
SV *sv;
// get past field name
buf->pos += strlen(buf->pos) + 1;
// get value
if ((sv = elem_to_sv (type, buf, dt_type, inflate_dbrefs, client ))) {
av_push (ret, sv);
}
}
return newRV_noinc ((SV *)ret);
}
SV *
perl_mongo_bson_to_sv (buffer *buf, char *dt_type, int inflate_dbrefs, SV *client )
{
utf8_flag_on = get_sv("MongoDB::BSON::utf8_flag_on", 0);
use_binary = get_sv("MongoDB::BSON::use_binary", 0);
return bson_to_sv(buf, dt_type, inflate_dbrefs, client);
}
static SV *
bson_to_sv (buffer *buf, char *dt_type, int inflate_dbrefs, SV *client )
{
HV *ret = newHV();
char type;
int is_dbref = 1;
int key_num = 0;
// for size
buf->pos += INT_32;
while ((type = *buf->pos++) != 0) {
char *name;
SV *value;
name = buf->pos;
key_num++;
/* check if this is a DBref. We must see the keys
$ref, $id, and $db in that order, with no extra keys */
if ( key_num == 1 && strcmp( name, "$ref" ) ) is_dbref = 0;
if ( key_num == 2 && is_dbref == 1 && strcmp( name, "$id" ) ) is_dbref = 0;
if ( key_num == 3 && is_dbref == 1 && strcmp( name, "$db" ) ) is_dbref = 0;
// get past field name
buf->pos += strlen(buf->pos) + 1;
// get value
value = elem_to_sv(type, buf, dt_type, inflate_dbrefs, client );
if (!utf8_flag_on || !SvIOK(utf8_flag_on) || SvIV(utf8_flag_on) != 0) {
if (!hv_store (ret, name, 0-strlen (name), value, 0)) {
croak ("failed storing value in hash");
}
} else {
if (!hv_store (ret, name, strlen (name), value, 0)) {
croak ("failed storing value in hash");
}
}
}
if ( key_num == 3 && is_dbref == 1 && inflate_dbrefs == 1 ) {
SV *dbr_class = sv_2mortal(newSVpv("MongoDB::DBRef", 0));
SV *dbref =
perl_mongo_call_method( dbr_class, "new", 0, 8,
newSVpvs("ref"),
*hv_fetch( ret, "$ref", 4, FALSE ),
newSVpvs("id"),
*hv_fetch( ret, "$id", 3, FALSE ),
newSVpvs("db"),
*hv_fetch( ret, "$db", 3, FALSE ),
newSVpvs("client"),
client
);
return dbref;
}
return newRV_noinc ((SV *)ret);
}
int perl_mongo_resize_buf(buffer *buf, int size) {
int total = buf->end - buf->start;
int used = buf->pos - buf->start;
total = total < GROW_SLOWLY ? total*2 : total+INITIAL_BUF_SIZE;
while (total-used < size) {
total += size;
}
Renew(buf->start, total, char);
buf->pos = buf->start + used;
buf->end = buf->start + total;
return total;
}
void perl_mongo_serialize_byte(buffer *buf, char b) {
if(BUF_REMAINING <= 1) {
perl_mongo_resize_buf(buf, 1);
}
*(buf->pos) = b;
buf->pos += 1;
}
void perl_mongo_serialize_bytes(buffer *buf, const char *str, unsigned int str_len) {
if(BUF_REMAINING <= str_len) {
perl_mongo_resize_buf(buf, str_len);
}
memcpy(buf->pos, str, str_len);
buf->pos += str_len;
}
void perl_mongo_serialize_string(buffer *buf, const char *str, unsigned int str_len) {
if(BUF_REMAINING <= str_len+1) {
perl_mongo_resize_buf(buf, str_len+1);
}
memcpy(buf->pos, str, str_len);
// add \0 at the end of the string
buf->pos[str_len] = 0;
buf->pos += str_len + 1;
}
void perl_mongo_serialize_int(buffer *buf, int num) {
int i = MONGO_32(num);
if(BUF_REMAINING <= INT_32) {
perl_mongo_resize_buf(buf, INT_32);
}
memcpy(buf->pos, &i, INT_32);
buf->pos += INT_32;
}
void perl_mongo_serialize_long(buffer *buf, int64_t num) {
int64_t i = MONGO_64(num);
if(BUF_REMAINING <= INT_64) {
perl_mongo_resize_buf(buf, INT_64);
}
memcpy(buf->pos, &i, INT_64);
buf->pos += INT_64;
}
void perl_mongo_serialize_double(buffer *buf, double num) {
int64_t dest, *dest_p;
dest_p = &dest;
memcpy(dest_p, &num, 8);
dest = MONGO_64(dest);
if(BUF_REMAINING <= DOUBLE_64) {
perl_mongo_resize_buf(buf, DOUBLE_64);
}
memcpy(buf->pos, dest_p, DOUBLE_64);
buf->pos += DOUBLE_64;
}
void perl_mongo_serialize_oid(buffer *buf, char *id) {
int i;
if(BUF_REMAINING <= OID_SIZE) {
perl_mongo_resize_buf(buf, OID_SIZE);
}
for(i=0;i<OID_SIZE;i++) {
char digit1 = id[i*2], digit2 = id[i*2+1];
digit1 = digit1 >= 'a' && digit1 <= 'f' ? digit1 - 87 : digit1;
digit1 = digit1 >= 'A' && digit1 <= 'F' ? digit1 - 55 : digit1;
digit1 = digit1 >= '0' && digit1 <= '9' ? digit1 - 48 : digit1;
digit2 = digit2 >= 'a' && digit2 <= 'f' ? digit2 - 87 : digit2;
digit2 = digit2 >= 'A' && digit2 <= 'F' ? digit2 - 55 : digit2;
digit2 = digit2 >= '0' && digit2 <= '9' ? digit2 - 48 : digit2;
buf->pos[i] = digit1*16+digit2;
}
buf->pos += OID_SIZE;
}
void perl_mongo_serialize_bindata(buffer *buf, const int subtype, SV *sv)
{
STRLEN len;
const char *bytes = SvPVbyte (sv, len);
if (subtype == SUBTYPE_BINARY_DEPRECATED) {
// length of length+bindata
perl_mongo_serialize_int(buf, len+4);
perl_mongo_serialize_byte(buf, subtype);
perl_mongo_serialize_int(buf, len);
}
else {
perl_mongo_serialize_int(buf, len);
perl_mongo_serialize_byte(buf, subtype);
}
// bindata
perl_mongo_serialize_bytes(buf, bytes, len);
}
void perl_mongo_serialize_key(buffer *buf, const char *str, int is_insert) {
STRLEN len = strlen(str);
if(BUF_REMAINING <= len+1) {
perl_mongo_resize_buf(buf, len+1);
}
if (str[0] == '\0') {
croak("empty key name, did you use a $ with double quotes?");
}
if (is_insert && strchr(str, '.')) {
croak("inserts cannot contain the . character");
}
if (special_char && SvPOK(special_char) && SvPV_nolen(special_char)[0] == str[0]) {
*(buf->pos) = '$';
memcpy(buf->pos+1, str+1, len-1);
}
else {
memcpy(buf->pos, str, len);
}
// add \0 at the end of the string
buf->pos[len] = 0;
buf->pos += len + 1;
}
/* the position is not increased, we are just filling
* in the first 4 bytes with the size.
*/
void perl_mongo_serialize_size(char *start, buffer *buf) {
int total = buf->pos - start;
total = MONGO_32(total);
memcpy(start, &total, INT_32);
}
void perl_mongo_make_id(char *id) {
//SV *temp;
char *data = id;
Pid_t pid = PerlProc_getpid();
int inc;
unsigned t;
char *T, *M, *P, *I;
#ifdef USE_ITHREADS
MUTEX_LOCK(&inc_mutex);
#endif
inc = perl_mongo_inc++;
#ifdef USE_ITHREADS
MUTEX_UNLOCK(&inc_mutex);
#endif
t = (unsigned) time(0);
T = (char*)&t;
M = (char*)&perl_mongo_machine_id;
P = (char*)&pid;
I = (char*)&inc;
#if MONGO_BIG_ENDIAN
memcpy(data, T, 4);
memcpy(data+4, M+1, 3);
memcpy(data+7, P+2, 2);
memcpy(data+9, I+1, 3);
#else
data[0] = T[3];
data[1] = T[2];
data[2] = T[1];
data[3] = T[0];
memcpy(data+4, M, 3);
memcpy(data+7, P, 2);
data[9] = I[2];
data[10] = I[1];
data[11] = I[0];// memcpy(data+9, I, 3);
#endif
}
/* add an _id */
static void
perl_mongo_prep(buffer *buf, AV *ids) {
// SV *id = perl_mongo_construct_instance ("MongoDB::OID", NULL);
SV *id;
HV *id_hv, *stash;
char id_s[12], oid_s[25];
stash = gv_stashpv("MongoDB::OID", 0);
perl_mongo_make_id(id_s);
set_type(buf, BSON_OID);
perl_mongo_serialize_key(buf, "_id", 0);
perl_mongo_serialize_bytes(buf, id_s, 12);
perl_mongo_make_oid(id_s, oid_s);
id_hv = newHV();
(void)hv_stores(id_hv, "value", newSVpvn(oid_s, 24));
id = sv_bless(newRV_noinc((SV *)id_hv), stash);
av_push(ids, id);
}
/**
* checks if a ptr has been parsed already and, if not, adds it to the stack. If
* we do have a circular ref, this function returns 0.
*/
static stackette* check_circular_ref(void *ptr, stackette *stack) {
stackette *ette, *start = stack;
while (stack) {
if (ptr == stack->ptr) {
return 0;
}
stack = stack->prev;
}
// push this onto the circular ref stack
Newx(ette, 1, stackette);
ette->ptr = ptr;
// if stack has not been initialized, stack will be 0 so this will work out
ette->prev = start;
return ette;
}
static void
hv_to_bson (buffer *buf, SV *sv, AV *ids, stackette *stack, int is_insert)
{
int start;
HE *he;
HV *hv;
if (BUF_REMAINING <= 5) {
perl_mongo_resize_buf(buf, 5);
}
/* keep a record of the starting position
* as an offset, in case the memory is resized */
start = buf->pos-buf->start;
/* skip first 4 bytes to leave room for size */
buf->pos += INT_32;
if (!SvROK(sv)) {
perl_mongo_serialize_null(buf);
perl_mongo_serialize_size(buf->start+start, buf);
return;
}
hv = (HV*)SvRV(sv);
if (!(stack = check_circular_ref(hv, stack))) {
Safefree(buf->start);