forked from ruby/ruby
/
pack.c
1444 lines (1304 loc) · 28.7 KB
/
pack.c
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/************************************************
pack.c -
$Author$
$Date$
created at: Thu Feb 10 15:17:05 JST 1994
Copyright (C) 1993-1999 Yukihiro Matsumoto
************************************************/
#include "ruby.h"
#include <sys/types.h>
#include <ctype.h>
#define define_swapx(x, xtype) \
static xtype \
TOKEN_PASTE(swap,x)(z) \
xtype z; \
{ \
xtype r; \
xtype *zp; \
unsigned char *s, *t; \
int i; \
\
zp = (xtype *)malloc(sizeof(xtype));\
*zp = z; \
s = (char *)zp; \
t = (char *)malloc(sizeof(xtype)); \
for (i=0 ; i<sizeof(xtype); i++) { \
t[sizeof(xtype)-i-1] = s[i]; \
} \
r = *(xtype *)t; \
free(t); \
free(zp); \
return r; \
}
#if SIZEOF_SHORT == 2
#define swaps(x) ((((x)&0xFF)<<8) + (((x)>>8)&0xFF))
#else
#if SIZEOF_SHORT == 4
#define swaps(x) ((((x)&0xFF)<<24) \
+(((x)>>24)&0xFF) \
+(((x)&0x0000FF00)<<8) \
+(((x)&0x00FF0000)>>8) )
#else
define_swapx(s,short);
#endif
#endif
#if SIZEOF_LONG == 4
#define swapl(x) ((((x)&0xFF)<<24) \
+(((x)>>24)&0xFF) \
+(((x)&0x0000FF00)<<8) \
+(((x)&0x00FF0000)>>8) )
#else
#if SIZEOF_LONG == 8
#define swapl(x) ((((x)&0x00000000000000FF)<<56) \
+(((x)&0xFF00000000000000)>>56) \
+(((x)&0x000000000000FF00)<<40) \
+(((x)&0x00FF000000000000)>>40) \
+(((x)&0x0000000000FF0000)<<24) \
+(((x)&0x0000FF0000000000)>>24) \
+(((x)&0x00000000FF000000)<<8) \
+(((x)&0x000000FF00000000)>>8) )
#else
define_swapx(l,long);
#endif
#endif
#if SIZEOF_FLOAT == 4
#if SIZEOF_LONG == 4 /* SIZEOF_FLOAT == 4 == SIZEOF_LONG */
#define swapf(x) swapl(x)
#define FLOAT_SWAPPER unsigned long
#else
#if SIZEOF_SHORT == 4 /* SIZEOF_FLOAT == 4 == SIZEOF_SHORT */
#define swapf(x) swaps(x)
#define FLOAT_SWAPPER unsigned short
#else /* SIZEOF_FLOAT == 4 but undivide by known size of int */
define_swapx(f,float);
#endif /* #if SIZEOF_SHORT == 4 */
#endif /* #if SIZEOF_LONG == 4 */
#else /* SIZEOF_FLOAT != 4 */
define_swapx(f,float);
#endif /* #if SIZEOF_FLOAT == 4 */
#if SIZEOF_DOUBLE == 8
#if SIZEOF_LONG == 8 /* SIZEOF_DOUBLE == 8 == SIZEOF_LONG */
#define swapd(x) swapl(x)
#define DOUBLE_SWAPPER unsigned long
#else
#if SIZEOF_LONG == 4 /* SIZEOF_DOUBLE == 8 && 4 == SIZEOF_LONG */
static double
swapd(d)
const double d;
{
double dtmp = d;
unsigned long utmp[2];
unsigned long utmp0;
utmp[0] = 0; utmp[1] = 0;
memcpy(utmp,&dtmp,sizeof(double));
utmp0 = utmp[0];
utmp[0] = swapl(utmp[1]);
utmp[1] = swapl(utmp0);
memcpy(&dtmp,utmp,sizeof(double));
return dtmp;
}
#else
#if SIZEOF_SHORT == 4 /* SIZEOF_DOUBLE == 8 && 4 == SIZEOF_SHORT */
static double
swapd(d)
const double d;
{
double dtmp = d;
unsigned short utmp[2];
unsigned short utmp0;
utmp[0] = 0; utmp[1] = 0;
memcpy(utmp,&dtmp,sizeof(double));
utmp0 = utmp[0];
utmp[0] = swaps(utmp[1]);
utmp[1] = swaps(utmp0);
memcpy(&dtmp,utmp,sizeof(double));
return dtmp;
}
#else /* SIZEOF_DOUBLE == 8 but undivied by known size of int */
define_swapx(d, double);
#endif /* #if SIZEOF_SHORT == 4 */
#endif /* #if SIZEOF_LONG == 4 */
#endif /* #if SIZEOF_LONG == 8 */
#else /* SIZEOF_DOUBLE != 8 */
define_swapx(d, double);
#endif /* #if SIZEOF_DPOUBLE == 8 */
#undef define_swapx
#ifdef DYNAMIC_ENDIAN
#ifdef ntohs
#undef ntohs
#undef ntohl
#undef htons
#undef htonl
#endif
static int
endian()
{
static int init = 0;
static int endian_value;
char *p;
if (init) return endian_value;
init = 1;
p = (char*)&init;
return endian_value = p[0]?0:1;
}
#define ntohs(x) (endian()?(x):swaps(x))
#define ntohl(x) (endian()?(x):swapl(x))
#define ntohf(x) (endian()?(x):swapf(x))
#define ntohd(x) (endian()?(x):swapd(x))
#define htons(x) (endian()?(x):swaps(x))
#define htonl(x) (endian()?(x):swapl(x))
#define htonf(x) (endian()?(x):swapf(x))
#define htond(x) (endian()?(x):swapd(x))
#define htovs(x) (endian()?swaps(x):(x))
#define htovl(x) (endian()?swapl(x):(x))
#define htovf(x) (endian()?swapf(x):(x))
#define htovd(x) (endian()?swapd(x):(x))
#define vtohs(x) (endian()?swaps(x):(x))
#define vtohl(x) (endian()?swapl(x):(x))
#define vtohf(x) (endian()?swapf(x):(x))
#define vtohd(x) (endian()?swapd(x):(x))
#else
#ifdef WORDS_BIGENDIAN
#ifndef ntohs
#define ntohs(x) (x)
#define ntohl(x) (x)
#define htons(x) (x)
#define htonl(x) (x)
#endif
#define ntohf(x) (x)
#define ntohd(x) (x)
#define htonf(x) (x)
#define htond(x) (x)
#define htovs(x) swaps(x)
#define htovl(x) swapl(x)
#define htovf(x) swapf(x)
#define htovd(x) swapd(x)
#define vtohs(x) swaps(x)
#define vtohl(x) swapl(x)
#define vtohf(x) swapf(x)
#define vtohd(x) swapd(x)
#else /* LITTLE ENDIAN */
#ifndef ntohs
#undef ntohs
#undef ntohl
#undef htons
#undef htonl
#define ntohs(x) swaps(x)
#define ntohl(x) swapl(x)
#define htons(x) swaps(x)
#define htonl(x) swapl(x)
#endif
#define ntohf(x) swapf(x)
#define ntohd(x) swapd(x)
#define htonf(x) swapf(x)
#define htond(x) swapd(x)
#define htovs(x) (x)
#define htovl(x) (x)
#define htovf(x) (x)
#define htovd(x) (x)
#define vtohs(x) (x)
#define vtohl(x) (x)
#define vtohf(x) (x)
#define vtohd(x) (x)
#endif
#endif
#ifdef FLOAT_SWAPPER
#define FLOAT_CONVWITH(y) FLOAT_SWAPPER y;
#define HTONF(x,y) (memcpy(&y,&x,sizeof(float)), \
y = htonf((FLOAT_SWAPPER)y), \
memcpy(&x,&y,sizeof(float)), \
x)
#define HTOVF(x,y) (memcpy(&y,&x,sizeof(float)), \
y = htovf((FLOAT_SWAPPER)y), \
memcpy(&x,&y,sizeof(float)), \
x)
#define NTOHF(x,y) (memcpy(&y,&x,sizeof(float)), \
y = ntohf((FLOAT_SWAPPER)y), \
memcpy(&x,&y,sizeof(float)), \
x)
#define VTOHF(x,y) (memcpy(&y,&x,sizeof(float)), \
y = vtohf((FLOAT_SWAPPER)y), \
memcpy(&x,&y,sizeof(float)), \
x)
#else
#define FLOAT_CONVWITH(y)
#define HTONF(x,y) htonf(x)
#define HTOVF(x,y) htovf(x)
#define NTOHF(x,y) ntohf(x)
#define VTOHF(x,y) vtohf(x)
#endif
#ifdef DOUBLE_SWAPPER
#define DOUBLE_CONVWITH(y) DOUBLE_SWAPPER y;
#define HTOND(x,y) (memcpy(&y,&x,sizeof(double)), \
y = htond((DOUBLE_SWAPPER)y), \
memcpy(&x,&y,sizeof(double)), \
x)
#define HTOVD(x,y) (memcpy(&y,&x,sizeof(double)), \
y = htovd((DOUBLE_SWAPPER)y), \
memcpy(&x,&y,sizeof(double)), \
x)
#define NTOHD(x,y) (memcpy(&y,&x,sizeof(double)), \
y = ntohd((DOUBLE_SWAPPER)y), \
memcpy(&x,&y,sizeof(double)), \
x)
#define VTOHD(x,y) (memcpy(&y,&x,sizeof(double)), \
y = vtohd((DOUBLE_SWAPPER)y), \
memcpy(&x,&y,sizeof(double)), \
x)
#else
#define DOUBLE_CONVWITH(y)
#define HTOND(x,y) htond(x)
#define HTOVD(x,y) htovd(x)
#define NTOHD(x,y) ntohd(x)
#define VTOHD(x,y) vtohd(x)
#endif
static char *toofew = "too few arguments";
static void encodes _((VALUE,char*,int,int));
static void qpencode _((VALUE,VALUE,int));
static void
pack_add_ptr(str, add)
VALUE str, add;
{
#define STR_NO_ORIG FL_USER3 /* copied from string.c */
if (!RSTRING(str)->orig) {
RSTRING(str)->orig = rb_ary_new();
FL_SET(str, STR_NO_ORIG);
}
rb_ary_push(RSTRING(str)->orig, add);
}
static VALUE
pack_pack(ary, fmt)
VALUE ary, fmt;
{
static char *nul10 = "\0\0\0\0\0\0\0\0\0\0";
static char *spc10 = " ";
char *p, *pend;
VALUE res, from;
char type;
int items, len, idx;
char *ptr;
int plen;
p = rb_str2cstr(fmt, &plen);
pend = p + plen;
res = rb_str_new(0, 0);
items = RARRAY(ary)->len;
idx = 0;
#define NEXTFROM (items-- > 0 ? RARRAY(ary)->ptr[idx++] : (rb_raise(rb_eArgError, toofew),0))
while (p < pend) {
type = *p++; /* get data type */
if (*p == '*') { /* set data length */
len = strchr("@Xxu", type) ? 0 : items;
p++;
}
else if (ISDIGIT(*p)) {
len = strtoul(p, (char**)&p, 10);
}
else {
len = 1;
}
switch (type) {
case 'A': case 'a':
case 'B': case 'b':
case 'H': case 'h':
from = NEXTFROM;
if (NIL_P(from)) {
ptr = "";
plen = 0;
}
else {
from = rb_obj_as_string(from);
ptr = RSTRING(from)->ptr;
plen = RSTRING(from)->len;
}
if (p[-1] == '*')
len = plen;
switch (type) {
case 'a':
case 'A':
if (plen >= len)
rb_str_cat(res, ptr, len);
else {
rb_str_cat(res, ptr, plen);
len -= plen;
while (len >= 10) {
rb_str_cat(res, (type == 'A')?spc10:nul10, 10);
len -= 10;
}
rb_str_cat(res, (type == 'A')?spc10:nul10, len);
}
break;
case 'b':
{
int byte = 0;
int i;
for (i=0; i++ < len; ptr++) {
if (*ptr & 1)
byte |= 128;
if (i & 7)
byte >>= 1;
else {
char c = byte & 0xff;
rb_str_cat(res, &c, 1);
byte = 0;
}
}
if (len & 7) {
char c;
byte >>= 7 - (len & 7);
c = byte & 0xff;
rb_str_cat(res, &c, 1);
}
}
break;
case 'B':
{
int byte = 0;
int i;
for (i=0; i++ < len; ptr++) {
byte |= *ptr & 1;
if (i & 7)
byte <<= 1;
else {
char c = byte & 0xff;
rb_str_cat(res, &c, 1);
byte = 0;
}
}
if (len & 7) {
char c;
byte <<= 7 - (len & 7);
c = byte & 0xff;
rb_str_cat(res, &c, 1);
}
}
break;
case 'h':
{
int byte = 0;
int i;
for (i=0; i++ < len; ptr++) {
if (ISXDIGIT(*ptr)) {
if (ISALPHA(*ptr))
byte |= (((*ptr & 15) + 9) & 15) << 4;
else
byte |= (*ptr & 15) << 4;
if (i & 1)
byte >>= 4;
else {
char c = byte & 0xff;
rb_str_cat(res, &c, 1);
byte = 0;
}
}
}
if (len & 1) {
char c = byte & 0xff;
rb_str_cat(res, &c, 1);
}
}
break;
case 'H':
{
int byte = 0;
int i;
for (i=0; i++ < len; ptr++) {
if (ISXDIGIT(*ptr)) {
if (ISALPHA(*ptr))
byte |= ((*ptr & 15) + 9) & 15;
else
byte |= *ptr & 15;
if (i & 1)
byte <<= 4;
else {
char c = byte & 0xff;
rb_str_cat(res, &c, 1);
byte = 0;
}
}
}
if (len & 1) {
char c = byte & 0xff;
rb_str_cat(res, &c, 1);
}
}
break;
}
break;
case 'c':
case 'C':
while (len-- > 0) {
char c;
from = NEXTFROM;
if (NIL_P(from)) c = 0;
else {
c = NUM2INT(from);
}
rb_str_cat(res, &c, sizeof(char));
}
break;
case 's':
case 'S':
while (len-- > 0) {
short s;
from = NEXTFROM;
if (NIL_P(from)) s = 0;
else {
s = NUM2INT(from);
}
rb_str_cat(res, (char*)&s, sizeof(short));
}
break;
case 'i':
case 'I':
while (len-- > 0) {
int i;
from = NEXTFROM;
if (NIL_P(from)) i = 0;
else {
i = NUM2UINT(from);
}
rb_str_cat(res, (char*)&i, sizeof(int));
}
break;
case 'l':
case 'L':
while (len-- > 0) {
long l;
from = NEXTFROM;
if (NIL_P(from)) l = 0;
else {
l = NUM2ULONG(from);
}
rb_str_cat(res, (char*)&l, sizeof(long));
}
break;
case 'n':
while (len-- > 0) {
unsigned short s;
from = NEXTFROM;
if (NIL_P(from)) s = 0;
else {
s = NUM2INT(from);
}
s = htons(s);
rb_str_cat(res, (char*)&s, sizeof(short));
}
break;
case 'N':
while (len-- > 0) {
unsigned long l;
from = NEXTFROM;
if (NIL_P(from)) l = 0;
else {
l = NUM2ULONG(from);
}
l = htonl(l);
rb_str_cat(res, (char*)&l, sizeof(long));
}
break;
case 'v':
while (len-- > 0) {
unsigned short s;
from = NEXTFROM;
if (NIL_P(from)) s = 0;
else {
s = NUM2INT(from);
}
s = htovs(s);
rb_str_cat(res, (char*)&s, sizeof(short));
}
break;
case 'V':
while (len-- > 0) {
unsigned long l;
from = NEXTFROM;
if (NIL_P(from)) l = 0;
else {
l = NUM2ULONG(from);
}
l = htovl(l);
rb_str_cat(res, (char*)&l, sizeof(long));
}
break;
case 'f':
case 'F':
while (len-- > 0) {
float f;
from = NEXTFROM;
switch (TYPE(from)) {
case T_FLOAT:
f = RFLOAT(from)->value;
break;
case T_STRING:
f = atof(RSTRING(from)->ptr);
default:
f = (float)NUM2INT(from);
break;
}
rb_str_cat(res, (char*)&f, sizeof(float));
}
break;
case 'e':
while (len-- > 0) {
float f;
FLOAT_CONVWITH(ftmp);
from = NEXTFROM;
switch (TYPE(from)) {
case T_FLOAT:
f = RFLOAT(from)->value;
break;
case T_STRING:
f = atof(RSTRING(from)->ptr);
default:
f = (float)NUM2INT(from);
break;
}
f = HTOVF(f,ftmp);
rb_str_cat(res, (char*)&f, sizeof(float));
}
break;
case 'E':
while (len-- > 0) {
double d;
DOUBLE_CONVWITH(dtmp);
from = NEXTFROM;
switch (TYPE(from)) {
case T_FLOAT:
d = RFLOAT(from)->value;
break;
case T_STRING:
d = atof(RSTRING(from)->ptr);
default:
d = (double)NUM2INT(from);
break;
}
d = HTOVD(d,dtmp);
rb_str_cat(res, (char*)&d, sizeof(double));
}
break;
case 'd':
case 'D':
while (len-- > 0) {
double d;
from = NEXTFROM;
switch (TYPE(from)) {
case T_FLOAT:
d = RFLOAT(from)->value;
break;
case T_STRING:
d = atof(RSTRING(from)->ptr);
default:
d = (double)NUM2INT(from);
break;
}
rb_str_cat(res, (char*)&d, sizeof(double));
}
break;
case 'g':
while (len-- > 0) {
float f;
FLOAT_CONVWITH(ftmp);
from = NEXTFROM;
switch (TYPE(from)) {
case T_FLOAT:
f = RFLOAT(from)->value;
break;
case T_STRING:
f = atof(RSTRING(from)->ptr);
default:
f = (float)NUM2INT(from);
break;
}
f = HTONF(f,ftmp);
rb_str_cat(res, (char*)&f, sizeof(float));
}
break;
case 'G':
while (len-- > 0) {
double d;
DOUBLE_CONVWITH(dtmp);
from = NEXTFROM;
switch (TYPE(from)) {
case T_FLOAT:
d = RFLOAT(from)->value;
break;
case T_STRING:
d = atof(RSTRING(from)->ptr);
default:
d = (double)NUM2INT(from);
break;
}
d = HTOND(d,dtmp);
rb_str_cat(res, (char*)&d, sizeof(double));
}
break;
case 'x':
grow:
while (len >= 10) {
rb_str_cat(res, nul10, 10);
len -= 10;
}
rb_str_cat(res, nul10, len);
break;
case 'X':
shrink:
if (RSTRING(res)->len < len)
rb_raise(rb_eArgError, "X outside of string");
RSTRING(res)->len -= len;
RSTRING(res)->ptr[RSTRING(res)->len] = '\0';
break;
case '@':
len -= RSTRING(res)->len;
if (len > 0) goto grow;
len = -len;
if (len > 0) goto shrink;
break;
case '%':
rb_raise(rb_eArgError, "% may only be used in unpack");
break;
case 'u':
case 'm':
from = rb_obj_as_string(NEXTFROM);
ptr = RSTRING(from)->ptr;
plen = RSTRING(from)->len;
if (len <= 1)
len = 45;
else
len = len / 3 * 3;
while (plen > 0) {
int todo;
if (plen > len)
todo = len;
else
todo = plen;
encodes(res, ptr, todo, type);
plen -= todo;
ptr += todo;
}
break;
case 'M':
from = rb_obj_as_string(NEXTFROM);
if (len <= 1)
len = 72;
qpencode(res, from, len);
break;
case 'P':
len = 1;
/* FALL THROUGH */
case 'p':
while (len-- > 0) {
char *t;
from = NEXTFROM;
if (NIL_P(from)) t = "";
else {
t = STR2CSTR(from);
pack_add_ptr(res, from);
}
rb_str_cat(res, (char*)&t, sizeof(char*));
}
break;
default:
break;
}
}
return res;
}
static char uu_table[] =
"`!\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_";
static char b64_table[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static void
encodes(str, s, len, type)
VALUE str;
char *s;
int len;
int type;
{
char *buff = ALLOCA_N(char, len * 4 / 3 + 6);
int i = 0;
char *trans = type == 'u' ? uu_table : b64_table;
int padding;
if (type == 'u') {
buff[i++] = len + ' ';
padding = '`';
}
else {
padding = '=';
}
while (len >= 3) {
buff[i++] = trans[077 & (*s >> 2)];
buff[i++] = trans[077 & (((*s << 4) & 060) | ((s[1] >> 4) & 017))];
buff[i++] = trans[077 & (((s[1] << 2) & 074) | ((s[2] >> 6) & 03))];
buff[i++] = trans[077 & s[2]];
s += 3;
len -= 3;
}
if (len == 2) {
buff[i++] = trans[077 & (*s >> 2)];
buff[i++] = trans[077 & (((*s << 4) & 060) | ((s[1] >> 4) & 017))];
buff[i++] = trans[077 & (((s[1] << 2) & 074) | (('\0' >> 6) & 03))];
buff[i++] = padding;
}
else if (len == 1) {
buff[i++] = trans[077 & (*s >> 2)];
buff[i++] = trans[077 & (((*s << 4) & 060) | (('\0' >> 4) & 017))];
buff[i++] = padding;
buff[i++] = padding;
}
buff[i++] = '\n';
rb_str_cat(str, buff, i);
}
static char hex_table[] = "0123456789ABCDEF";
static void
qpencode(str, from, len)
VALUE str, from;
int len;
{
char buff[1024];
int i = 0, n = 0, prev = EOF;
unsigned char *s = (unsigned char*)RSTRING(from)->ptr;
unsigned char *send = s + RSTRING(from)->len;
while (s < send) {
if ((*s > 126) ||
(*s < 32 && *s != '\n' && *s != '\t') ||
(*s == '=')) {
buff[i++] = '=';
buff[i++] = hex_table[*s >> 4];
buff[i++] = hex_table[*s & 0x0f];
n += 3;
prev = EOF;
}
else if (*s == '\n') {
if (prev == ' ' || prev == '\t') {
buff[i++] = '=';
buff[i++] = *s;
}
buff[i++] = *s;
n = 0;
prev = *s;
}
else {
buff[i++] = *s;
n++;
prev = *s;
}
if (n > len) {
buff[i++] = '=';
buff[i++] = '\n';
n = 0;
prev = '\n';
}
if (i > 1024 - 5) {
rb_str_cat(str, buff, i);
i = 0;
}
s++;
}
if (n > 0) {
buff[i++] = '=';
buff[i++] = '\n';
}
if (i > 0) {
rb_str_cat(str, buff, i);
}
}
#if defined(__GNUC__) && __GNUC__ >= 2 && !defined(RUBY_NO_INLINE)
static __inline__ int
#else
static int
#endif
hex2num(c)
char c;
{
switch (c) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
return c - '0';
case 'a': case 'b': case 'c':
case 'd': case 'e': case 'f':
return c - 'a' + 10;
case 'A': case 'B': case 'C':
case 'D': case 'E': case 'F':
return c - 'A' + 10;
default:
return -1;
}
}
static VALUE
pack_unpack(str, fmt)
VALUE str, fmt;
{
static char *hexdigits = "0123456789abcdef0123456789ABCDEFx";
char *s, *send;
char *p, *pend;
VALUE ary;
char type;
int len;
s = rb_str2cstr(str, &len);
send = s + len;
p = rb_str2cstr(fmt, &len);
pend = p + len;
ary = rb_ary_new();
while (p < pend) {
type = *p++;
if (*p == '*') {
len = send - s;
p++;
}
else if (ISDIGIT(*p)) {
len = strtoul(p, (char**)&p, 10);
}
else {
len = (type != '@');
}
switch (type) {
case '%':
rb_raise(rb_eArgError, "% is not supported(yet)");
break;
case 'A':
if (len > send - s) len = send - s;
{
int end = len;
char *t = s + len - 1;
while (t >= s) {
if (*t != ' ' && *t != '\0') break;
t--;
len--;
}
rb_ary_push(ary, rb_str_new(s, len));
s += end;
}
break;
case 'a':
if (len > send - s) len = send - s;
rb_ary_push(ary, rb_str_new(s, len));
s += len;
break;
case 'b':
{
VALUE bitstr;
char *t;
int bits, i;
if (p[-1] == '*' || len > (send - s) * 8)
len = (send - s) * 8;
bits = 0;
rb_ary_push(ary, bitstr = rb_str_new(0, len));
t = RSTRING(bitstr)->ptr;
for (i=0; i<len; i++) {
if (i & 7) bits >>= 1;
else bits = *s++;
*t++ = (bits & 1) ? '1' : '0';
}
}
break;
case 'B':
{
VALUE bitstr;
char *t;
int bits, i;
if (p[-1] == '*' || len > (send - s) * 8)
len = (send - s) * 8;
bits = 0;
rb_ary_push(ary, bitstr = rb_str_new(0, len));
t = RSTRING(bitstr)->ptr;
for (i=0; i<len; i++) {