/***********************************************************

Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,

The Netherlands.

All Rights Reserved

Permission to use, copy, modify, and distribute this software and its

documentation for any purpose and without fee is hereby granted,

provided that the above copyright notice appear in all copies and that

both that copyright notice and this permission notice appear in

supporting documentation, and that the names of Stichting Mathematisch

Centrum or CWI not be used in advertising or publicity pertaining to

distribution of the software without specific, written prior permission.

STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO

THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND

FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE

FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT

OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

******************************************************************/

/* Write Python objects to files and read them back.

This is intended for writing and reading compiled Python code only;

a true persistent storage facility would be much harder, since

it would have to take circular links and sharing into account. */

#include "allobjects.h"

#include "modsupport.h"

#include "longintrepr.h"

#include "compile.h"

#include "marshal.h"

#include <errno.h>

#define TYPE_NULL '0'

#define TYPE_NONE 'N'

#define TYPE_INT 'i'

#define TYPE_FLOAT 'f'

#define TYPE_LONG 'l'

#define TYPE_STRING 's'

#define TYPE_TUPLE '('

#define TYPE_LIST '['

#define TYPE_DICT '{'

#define TYPE_CODE 'C'

#define TYPE_UNKNOWN '?'

typedef struct {

FILE *fp;

/* If fp == NULL, the following are valid: */

object *str;

char *ptr;

char *end;

} WFILE;

#define w_byte(c, p) if (((p)->fp)) putc((c), (p)->fp); \

else if ((p)->ptr != (p)->end) *(p)->ptr++ = (c); \

else w_more(c, p)

static void

w_more(c, p)

char c;

WFILE *p;

{

int size, newsize;

if (p->str == NULL)

return; /* An error already occurred */

size = getstringsize(p->str);

newsize = size + 1024;

if (resizestring(&p->str, newsize) != 0) {

p->ptr = p->end = NULL;

}

else {

p->ptr = GETSTRINGVALUE((stringobject *)p->str) + size;

p->end = GETSTRINGVALUE((stringobject *)p->str) + newsize;

*p->ptr++ = c;

}

}

static void

w_string(s, n, p)

char *s;

int n;

WFILE *p;

{

if (p->fp != NULL) {

fwrite(s, 1, n, p->fp);

}

else {

while (--n >= 0) {

w_byte(*s, p);

s++;

}

}

}

static void

w_short(x, p)

int x;

WFILE *p;

{

w_byte( x & 0xff, p);

w_byte((x>> 8) & 0xff, p);

}

static void

w_long(x, p)

long x;

WFILE *p;

{

w_byte((int)( x & 0xff), p);

w_byte((int)((x>> 8) & 0xff), p);

w_byte((int)((x>>16) & 0xff), p);

w_byte((int)((x>>24) & 0xff), p);

}

static void

w_object(v, p)

object *v;

WFILE *p;

{

long i, n;

if (v == NULL)

w_byte(TYPE_NULL, p);

else if (v == None)

w_byte(TYPE_NONE, p);

else if (is_intobject(v)) {

w_byte(TYPE_INT, p);

w_long(getintvalue(v), p);

}

else if (is_longobject(v)) {

longobject *ob = (longobject *)v;

w_byte(TYPE_LONG, p);

n = ob->ob_size;

w_long((long)n, p);

if (n < 0)

n = -n;

for (i = 0; i < n; i++)

w_short(ob->ob_digit[i], p);

}

else if (is_floatobject(v)) {

extern void float_buf_repr PROTO((char *, floatobject *));

char buf[256]; /* Plenty to format any double */

float_buf_repr(buf, (floatobject *)v);

n = strlen(buf);

w_byte(TYPE_FLOAT, p);

w_byte((int)n, p);

w_string(buf, (int)n, p);

}

else if (is_stringobject(v)) {

w_byte(TYPE_STRING, p);

n = getstringsize(v);

w_long(n, p);

w_string(getstringvalue(v), (int)n, p);

}

else if (is_tupleobject(v)) {

w_byte(TYPE_TUPLE, p);

n = gettuplesize(v);

w_long(n, p);

for (i = 0; i < n; i++) {

w_object(gettupleitem(v, (int)i), p);

}

}

else if (is_listobject(v)) {

w_byte(TYPE_LIST, p);

n = getlistsize(v);

w_long(n, p);

for (i = 0; i < n; i++) {

w_object(getlistitem(v, (int)i), p);

}

}

else if (is_dictobject(v)) {

int pos;

object *key, *value;

w_byte(TYPE_DICT, p);

/* This one is NULL object terminated! */

pos = 0;

while (mappinggetnext(v, &pos, &key, &value)) {

w_object(key, p);

w_object(value, p);

}

w_object((object *)NULL, p);

}

else if (is_codeobject(v)) {

codeobject *co = (codeobject *)v;

w_byte(TYPE_CODE, p);

w_object((object *)co->co_code, p);

w_object(co->co_consts, p);

w_object(co->co_names, p);

w_object(co->co_filename, p);

w_object(co->co_name, p);

}

else {

w_byte(TYPE_UNKNOWN, p);

}

}

void

wr_long(x, fp)

long x;

FILE *fp;

{

WFILE wf;

wf.fp = fp;

w_long(x, &wf);

}

void

wr_object(x, fp)

object *x;

FILE *fp;

{

WFILE wf;

wf.fp = fp;

w_object(x, &wf);

}

typedef WFILE RFILE; /* Same struct with different invariants */

#define r_byte(p) ((p)->fp ? getc((p)->fp) \

: ((p)->ptr != (p)->end) ? \

(unsigned char)*(p)->ptr++ : EOF)

static int

r_string(s, n, p)

char *s;

int n;

RFILE *p;

{

if (p->fp != NULL)

return fread(s, 1, n, p->fp);

if (p->end - p->ptr < n)

n = p->end - p->ptr;

memcpy(s, p->ptr, n);

p->ptr += n;

return n;

}

static int

r_short(p)

RFILE *p;

{

register short x;

x = r_byte(p);

x |= r_byte(p) << 8;

/* XXX If your short is > 16 bits, add sign-extension here!!! */

return x;

}

static long

r_long(p)

RFILE *p;

{

register long x;

x = r_byte(p);

x |= (long)r_byte(p) << 8;

x |= (long)r_byte(p) << 16;

x |= (long)r_byte(p) << 24;

/* XXX If your long is > 32 bits, add sign-extension here!!! */

return x;

}

static object *

r_object(p)

RFILE *p;

{

object *v;

long i, n;

int type = r_byte(p);

switch (type) {

case EOF:

err_setstr(EOFError, "EOF read where object expected");

return NULL;

case TYPE_NULL:

return NULL;

case TYPE_NONE:

INCREF(None);

return None;

case TYPE_INT:

return newintobject(r_long(p));

case TYPE_LONG:

{

int size;

longobject *ob;

n = r_long(p);

size = n<0 ? -n : n;

ob = alloclongobject(size);

if (ob == NULL)

return NULL;

ob->ob_size = n;

for (i = 0; i < size; i++)

ob->ob_digit[i] = r_short(p);

return (object *)ob;

}

case TYPE_FLOAT:

{

extern double atof PROTO((const char *));

char buf[256];

n = r_byte(p);

if (r_string(buf, (int)n, p) != n) {

err_setstr(EOFError,

"EOF read where object expected");

return NULL;

}

buf[n] = '\0';

return newfloatobject(atof(buf));

}

case TYPE_STRING:

n = r_long(p);

v = newsizedstringobject((char *)NULL, n);

if (v != NULL) {

if (r_string(getstringvalue(v), (int)n, p) != n) {

DECREF(v);

v = NULL;

err_setstr(EOFError,

"EOF read where object expected");

}

}

return v;

case TYPE_TUPLE:

n = r_long(p);

v = newtupleobject((int)n);

if (v == NULL)

return v;

for (i = 0; i < n; i++)

settupleitem(v, (int)i, r_object(p));

return v;

case TYPE_LIST:

n = r_long(p);

v = newlistobject((int)n);

if (v == NULL)

return v;

for (i = 0; i < n; i++)

setlistitem(v, (int)i, r_object(p));

return v;

case TYPE_DICT:

v = newdictobject();

if (v == NULL)

return NULL;

for (;;) {

object *key, *val;

key = r_object(p);

if (key == NULL)

break;

val = r_object(p);

dict2insert(v, key, val);

DECREF(key);

XDECREF(val);

}

return v;

case TYPE_CODE:

{

object *code = r_object(p);

object *consts = r_object(p);

object *names = r_object(p);

object *filename = r_object(p);

object *name = r_object(p);

if (!err_occurred()) {

v = (object *) newcodeobject(code,

consts, names, filename, name);

}

else

v = NULL;

XDECREF(code);

XDECREF(consts);

XDECREF(names);

XDECREF(filename);

XDECREF(name);

}

return v;

default:

err_setstr(TypeError, "read unknown object");

return NULL;

}

}

long

rd_long(fp)

FILE *fp;

{

RFILE rf;

rf.fp = fp;

return r_long(&rf);

}

object *

rd_object(fp)

FILE *fp;

{

RFILE rf;

if (err_occurred()) {

fprintf(stderr, "XXX rd_object called with exception set\n");

return NULL;

}

rf.fp = fp;

return r_object(&rf);

}

object *

rds_object(str, len)

char *str;

int len;

{

RFILE rf;

if (err_occurred()) {

fprintf(stderr, "XXX rds_object called with exception set\n");

return NULL;

}

rf.fp = NULL;

rf.str = NULL;

rf.ptr = str;

rf.end = str + len;

return r_object(&rf);

}

/* And an interface for Python programs... */

static object *

marshal_dump(self, args)

object *self;

object *args;

{

WFILE wf;

object *x;

object *f;

if (!getargs(args, "(OO)", &x, &f))

return NULL;

if (!is_fileobject(f)) {

err_setstr(TypeError, "marshal.dump() 2nd arg must be file");

return NULL;

}

wf.fp = getfilefile(f);

wf.str = NULL;

wf.ptr = wf.end = NULL;

w_object(x, &wf);

INCREF(None);

return None;

}

static object *

marshal_load(self, args)

object *self;

object *args;

{

RFILE rf;

object *f;

object *v;

if (!getargs(args, "O", &f))

return NULL;

if (!is_fileobject(f)) {

err_setstr(TypeError, "marshal.load() arg must be file");

return NULL;

}

rf.fp = getfilefile(f);

rf.str = NULL;

rf.ptr = rf.end = NULL;

err_clear();

v = r_object(&rf);

if (err_occurred()) {

XDECREF(v);

v = NULL;

}

return v;

}

static object *

marshal_dumps(self, args)

object *self;

object *args;

{

WFILE wf;

object *x;

if (!getargs(args, "O", &x))

return NULL;

wf.fp = NULL;

wf.str = newsizedstringobject((char *)NULL, 50);

if (wf.str == NULL)

return NULL;

wf.ptr = GETSTRINGVALUE((stringobject *)wf.str);

wf.end = wf.ptr + getstringsize(wf.str);

w_object(x, &wf);

if (wf.str != NULL)

resizestring(&wf.str,

(int) (wf.ptr - GETSTRINGVALUE((stringobject *)wf.str)));

return wf.str;

}

static object *

marshal_loads(self, args)

object *self;

object *args;

{

RFILE rf;

object *v;

char *s;

int n;

if (!getargs(args, "s#", &s, &n))

return NULL;

rf.fp = NULL;

rf.str = args;

rf.ptr = s;

rf.end = s + n;

err_clear();

v = r_object(&rf);

if (err_occurred()) {

XDECREF(v);

v = NULL;

}

return v;

}

static struct methodlist marshal_methods[] = {

{"dump", marshal_dump},

{"load", marshal_load},

{"dumps", marshal_dumps},

{"loads", marshal_loads},

{NULL, NULL} /* sentinel */

};

void

initmarshal()

{

(void) initmodule("marshal", marshal_methods);

}