Fresh start

1 files changed, 2018 insertions, 0 deletions

diff --git a/jni/ruby/pack.c b/jni/ruby/pack.c
new file mode 100644
index 0000000..b3f716d
--- /dev/null
+++ b/jni/ruby/pack.c
@@ -0,0 +1,2018 @@
+/**********************************************************************
+
+  pack.c -
+
+  $Author: akr $
+  created at: Thu Feb 10 15:17:05 JST 1994
+
+  Copyright (C) 1993-2007 Yukihiro Matsumoto
+
+**********************************************************************/
+
+#include "internal.h"
+#include <sys/types.h>
+#include <ctype.h>
+#include <errno.h>
+
+/*
+ * It is intentional that the condition for natstr is HAVE_TRUE_LONG_LONG
+ * instead of HAVE_LONG_LONG or LONG_LONG.
+ * This means q! and Q! means always the standard long long type and
+ * causes ArgumentError for platforms which has no long long type,
+ * even if the platform has an implementation specific 64bit type.
+ * This behavior is consistent with the document of pack/unpack.
+ */
+#ifdef HAVE_TRUE_LONG_LONG
+static const char natstr[] = "sSiIlLqQ";
+#else
+static const char natstr[] = "sSiIlL";
+#endif
+static const char endstr[] = "sSiIlLqQ";
+
+#ifdef HAVE_TRUE_LONG_LONG
+/* It is intentional to use long long instead of LONG_LONG. */
+# define NATINT_LEN_Q NATINT_LEN(long long, 8)
+#else
+# define NATINT_LEN_Q 8
+#endif
+
+#if SIZEOF_SHORT != 2 || SIZEOF_LONG != 4 || (defined(HAVE_TRUE_LONG_LONG) && SIZEOF_LONG_LONG != 8)
+# define NATINT_PACK
+#endif
+
+#ifdef DYNAMIC_ENDIAN
+ /* for universal binary of NEXTSTEP and MacOS X */
+ /* useless since autoconf 2.63? */
+ static int
+ is_bigendian(void)
+ {
+     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 BIGENDIAN_P() (is_bigendian())
+#elif defined(WORDS_BIGENDIAN)
+# define BIGENDIAN_P() 1
+#else
+# define BIGENDIAN_P() 0
+#endif
+
+#ifdef NATINT_PACK
+# define NATINT_LEN(type,len) (natint?(int)sizeof(type):(int)(len))
+#else
+# define NATINT_LEN(type,len) ((int)sizeof(type))
+#endif
+
+#define define_swapx(x, xtype)		\
+static xtype				\
+TOKEN_PASTE(swap,x)(xtype z)		\
+{					\
+    xtype r;				\
+    xtype *zp;				\
+    unsigned char *s, *t;		\
+    int i;				\
+					\
+    zp = xmalloc(sizeof(xtype));	\
+    *zp = z;				\
+    s = (unsigned char*)zp;		\
+    t = xmalloc(sizeof(xtype));		\
+    for (i=0; i<sizeof(xtype); i++) {	\
+	t[sizeof(xtype)-i-1] = s[i];	\
+    }					\
+    r = *(xtype *)t;			\
+    xfree(t);				\
+    xfree(zp);				\
+    return r;				\
+}
+
+#if SIZEOF_FLOAT == 4 && defined(HAVE_INT32_T)
+#   define swapf(x)	swap32(x)
+#   define FLOAT_SWAPPER	uint32_t
+#else
+    define_swapx(f,float)
+#endif
+
+#if SIZEOF_DOUBLE == 8 && defined(HAVE_INT64_T)
+#   define swapd(x)	swap64(x)
+#   define DOUBLE_SWAPPER	uint64_t
+#elif SIZEOF_DOUBLE == 8 && defined(HAVE_INT32_T)
+    static double
+    swapd(const double d)
+    {
+	double dtmp = d;
+	uint32_t utmp[2];
+	uint32_t utmp0;
+
+	utmp[0] = 0; utmp[1] = 0;
+	memcpy(utmp,&dtmp,sizeof(double));
+	utmp0 = utmp[0];
+	utmp[0] = swap32(utmp[1]);
+	utmp[1] = swap32(utmp0);
+	memcpy(&dtmp,utmp,sizeof(double));
+	return dtmp;
+    }
+#else
+    define_swapx(d, double)
+#endif
+
+#undef define_swapx
+
+#define rb_ntohf(x) (BIGENDIAN_P()?(x):swapf(x))
+#define rb_ntohd(x) (BIGENDIAN_P()?(x):swapd(x))
+#define rb_htonf(x) (BIGENDIAN_P()?(x):swapf(x))
+#define rb_htond(x) (BIGENDIAN_P()?(x):swapd(x))
+#define rb_htovf(x) (BIGENDIAN_P()?swapf(x):(x))
+#define rb_htovd(x) (BIGENDIAN_P()?swapd(x):(x))
+#define rb_vtohf(x) (BIGENDIAN_P()?swapf(x):(x))
+#define rb_vtohd(x) (BIGENDIAN_P()?swapd(x):(x))
+
+#ifdef FLOAT_SWAPPER
+# define FLOAT_CONVWITH(y)	FLOAT_SWAPPER y;
+# define HTONF(x,y)	(memcpy(&(y),&(x),sizeof(float)),	\
+			 (y) = rb_htonf((FLOAT_SWAPPER)(y)),	\
+			 memcpy(&(x),&(y),sizeof(float)),	\
+			 (x))
+# define HTOVF(x,y)	(memcpy(&(y),&(x),sizeof(float)),	\
+			 (y) = rb_htovf((FLOAT_SWAPPER)(y)),	\
+			 memcpy(&(x),&(y),sizeof(float)),	\
+			 (x))
+# define NTOHF(x,y)	(memcpy(&(y),&(x),sizeof(float)),	\
+			 (y) = rb_ntohf((FLOAT_SWAPPER)(y)),	\
+			 memcpy(&(x),&(y),sizeof(float)),	\
+			 (x))
+# define VTOHF(x,y)	(memcpy(&(y),&(x),sizeof(float)),	\
+			 (y) = rb_vtohf((FLOAT_SWAPPER)(y)),	\
+			 memcpy(&(x),&(y),sizeof(float)),	\
+			 (x))
+#else
+# define FLOAT_CONVWITH(y)
+# define HTONF(x,y)	rb_htonf(x)
+# define HTOVF(x,y)	rb_htovf(x)
+# define NTOHF(x,y)	rb_ntohf(x)
+# define VTOHF(x,y)	rb_vtohf(x)
+#endif
+
+#ifdef DOUBLE_SWAPPER
+# define DOUBLE_CONVWITH(y)	DOUBLE_SWAPPER y;
+# define HTOND(x,y)	(memcpy(&(y),&(x),sizeof(double)),	\
+			 (y) = rb_htond((DOUBLE_SWAPPER)(y)),	\
+			 memcpy(&(x),&(y),sizeof(double)),	\
+			 (x))
+# define HTOVD(x,y)	(memcpy(&(y),&(x),sizeof(double)),	\
+			 (y) = rb_htovd((DOUBLE_SWAPPER)(y)),	\
+			 memcpy(&(x),&(y),sizeof(double)),	\
+			 (x))
+# define NTOHD(x,y)	(memcpy(&(y),&(x),sizeof(double)),	\
+			 (y) = rb_ntohd((DOUBLE_SWAPPER)(y)),	\
+			 memcpy(&(x),&(y),sizeof(double)),	\
+			 (x))
+# define VTOHD(x,y)	(memcpy(&(y),&(x),sizeof(double)),	\
+			 (y) = rb_vtohd((DOUBLE_SWAPPER)(y)),	\
+			 memcpy(&(x),&(y),sizeof(double)),	\
+			 (x))
+#else
+# define DOUBLE_CONVWITH(y)
+# define HTOND(x,y)	rb_htond(x)
+# define HTOVD(x,y)	rb_htovd(x)
+# define NTOHD(x,y)	rb_ntohd(x)
+# define VTOHD(x,y)	rb_vtohd(x)
+#endif
+
+#define MAX_INTEGER_PACK_SIZE 8
+
+static const char toofew[] = "too few arguments";
+
+static void encodes(VALUE,const char*,long,int,int);
+static void qpencode(VALUE,VALUE,long);
+
+static unsigned long utf8_to_uv(const char*,long*);
+
+static ID id_associated;
+
+static void
+str_associate(VALUE str, VALUE add)
+{
+    VALUE assoc;
+
+    assoc = rb_attr_get(str, id_associated);
+    if (RB_TYPE_P(assoc, T_ARRAY)) {
+	/* already associated */
+	rb_ary_concat(assoc, add);
+    }
+    else {
+	rb_ivar_set(str, id_associated, add);
+    }
+}
+
+static VALUE
+str_associated(VALUE str)
+{
+    VALUE assoc = rb_attr_get(str, id_associated);
+    if (NIL_P(assoc)) assoc = Qfalse;
+    return assoc;
+}
+
+void
+rb_str_associate(VALUE str, VALUE add)
+{
+    rb_warn("rb_str_associate() is only for internal use and deprecated; do not use");
+    str_associate(str, add);
+}
+
+VALUE
+rb_str_associated(VALUE str)
+{
+    rb_warn("rb_str_associated() is only for internal use and deprecated; do not use");
+    return str_associated(str);
+}
+
+/*
+ *  call-seq:
+ *     arr.pack ( aTemplateString ) -> aBinaryString
+ *
+ *  Packs the contents of <i>arr</i> into a binary sequence according to
+ *  the directives in <i>aTemplateString</i> (see the table below)
+ *  Directives ``A,'' ``a,'' and ``Z'' may be followed by a count,
+ *  which gives the width of the resulting field. The remaining
+ *  directives also may take a count, indicating the number of array
+ *  elements to convert. If the count is an asterisk
+ *  (``<code>*</code>''), all remaining array elements will be
+ *  converted. Any of the directives ``<code>sSiIlL</code>'' may be
+ *  followed by an underscore (``<code>_</code>'') or
+ *  exclamation mark (``<code>!</code>'') to use the underlying
+ *  platform's native size for the specified type; otherwise, they use a
+ *  platform-independent size. Spaces are ignored in the template
+ *  string. See also <code>String#unpack</code>.
+ *
+ *     a = [ "a", "b", "c" ]
+ *     n = [ 65, 66, 67 ]
+ *     a.pack("A3A3A3")   #=> "a  b  c  "
+ *     a.pack("a3a3a3")   #=> "a\000\000b\000\000c\000\000"
+ *     n.pack("ccc")      #=> "ABC"
+ *
+ *  Directives for +pack+.
+ *
+ *   Integer      | Array   |
+ *   Directive    | Element | Meaning
+ *   ---------------------------------------------------------------------------
+ *      C         | Integer | 8-bit unsigned (unsigned char)
+ *      S         | Integer | 16-bit unsigned, native endian (uint16_t)
+ *      L         | Integer | 32-bit unsigned, native endian (uint32_t)
+ *      Q         | Integer | 64-bit unsigned, native endian (uint64_t)
+ *                |         |
+ *      c         | Integer | 8-bit signed (signed char)
+ *      s         | Integer | 16-bit signed, native endian (int16_t)
+ *      l         | Integer | 32-bit signed, native endian (int32_t)
+ *      q         | Integer | 64-bit signed, native endian (int64_t)
+ *                |         |
+ *      S_, S!    | Integer | unsigned short, native endian
+ *      I, I_, I! | Integer | unsigned int, native endian
+ *      L_, L!    | Integer | unsigned long, native endian
+ *      Q_, Q!    | Integer | unsigned long long, native endian (ArgumentError
+ *                |         | if the platform has no long long type.)
+ *                |         | (Q_ and Q! is available since Ruby 2.1.)
+ *                |         |
+ *      s_, s!    | Integer | signed short, native endian
+ *      i, i_, i! | Integer | signed int, native endian
+ *      l_, l!    | Integer | signed long, native endian
+ *      q_, q!    | Integer | signed long long, native endian (ArgumentError
+ *                |         | if the platform has no long long type.)
+ *                |         | (q_ and q! is available since Ruby 2.1.)
+ *                |         |
+ *      S> L> Q>  | Integer | same as the directives without ">" except
+ *      s> l> q>  |         | big endian
+ *      S!> I!>   |         | (available since Ruby 1.9.3)
+ *      L!> Q!>   |         | "S>" is same as "n"
+ *      s!> i!>   |         | "L>" is same as "N"
+ *      l!> q!>   |         |
+ *                |         |
+ *      S< L< Q<  | Integer | same as the directives without "<" except
+ *      s< l< q<  |         | little endian
+ *      S!< I!<   |         | (available since Ruby 1.9.3)
+ *      L!< Q!<   |         | "S<" is same as "v"
+ *      s!< i!<   |         | "L<" is same as "V"
+ *      l!< q!<   |         |
+ *                |         |
+ *      n         | Integer | 16-bit unsigned, network (big-endian) byte order
+ *      N         | Integer | 32-bit unsigned, network (big-endian) byte order
+ *      v         | Integer | 16-bit unsigned, VAX (little-endian) byte order
+ *      V         | Integer | 32-bit unsigned, VAX (little-endian) byte order
+ *                |         |
+ *      U         | Integer | UTF-8 character
+ *      w         | Integer | BER-compressed integer
+ *
+ *   Float        |         |
+ *   Directive    |         | Meaning
+ *   ---------------------------------------------------------------------------
+ *      D, d      | Float   | double-precision, native format
+ *      F, f      | Float   | single-precision, native format
+ *      E         | Float   | double-precision, little-endian byte order
+ *      e         | Float   | single-precision, little-endian byte order
+ *      G         | Float   | double-precision, network (big-endian) byte order
+ *      g         | Float   | single-precision, network (big-endian) byte order
+ *
+ *   String       |         |
+ *   Directive    |         | Meaning
+ *   ---------------------------------------------------------------------------
+ *      A         | String  | arbitrary binary string (space padded, count is width)
+ *      a         | String  | arbitrary binary string (null padded, count is width)
+ *      Z         | String  | same as ``a'', except that null is added with *
+ *      B         | String  | bit string (MSB first)
+ *      b         | String  | bit string (LSB first)
+ *      H         | String  | hex string (high nibble first)
+ *      h         | String  | hex string (low nibble first)
+ *      u         | String  | UU-encoded string
+ *      M         | String  | quoted printable, MIME encoding (see RFC2045)
+ *      m         | String  | base64 encoded string (see RFC 2045, count is width)
+ *                |         | (if count is 0, no line feed are added, see RFC 4648)
+ *      P         | String  | pointer to a structure (fixed-length string)
+ *      p         | String  | pointer to a null-terminated string
+ *
+ *   Misc.        |         |
+ *   Directive    |         | Meaning
+ *   ---------------------------------------------------------------------------
+ *      @         | ---     | moves to absolute position
+ *      X         | ---     | back up a byte
+ *      x         | ---     | null byte
+ */
+
+static VALUE
+pack_pack(VALUE ary, VALUE fmt)
+{
+    static const char nul10[] = "\0\0\0\0\0\0\0\0\0\0";
+    static const char spc10[] = "          ";
+    const char *p, *pend;
+    VALUE res, from, associates = 0;
+    char type;
+    long items, len, idx, plen;
+    const char *ptr;
+    int enc_info = 1;		/* 0 - BINARY, 1 - US-ASCII, 2 - UTF-8 */
+#ifdef NATINT_PACK
+    int natint;		/* native integer */
+#endif
+    int integer_size, bigendian_p;
+
+    StringValue(fmt);
+    p = RSTRING_PTR(fmt);
+    pend = p + RSTRING_LEN(fmt);
+    res = rb_str_buf_new(0);
+
+    items = RARRAY_LEN(ary);
+    idx = 0;
+
+#define TOO_FEW (rb_raise(rb_eArgError, toofew), 0)
+#define THISFROM (items > 0 ? RARRAY_AREF(ary, idx) : TOO_FEW)
+#define NEXTFROM (items-- > 0 ? RARRAY_AREF(ary, idx++) : TOO_FEW)
+
+    while (p < pend) {
+	int explicit_endian = 0;
+	if (RSTRING_PTR(fmt) + RSTRING_LEN(fmt) != pend) {
+	    rb_raise(rb_eRuntimeError, "format string modified");
+	}
+	type = *p++;		/* get data type */
+#ifdef NATINT_PACK
+	natint = 0;
+#endif
+
+	if (ISSPACE(type)) continue;
+	if (type == '#') {
+	    while ((p < pend) && (*p != '\n')) {
+		p++;
+	    }
+	    continue;
+	}
+
+	{
+          modifiers:
+	    switch (*p) {
+	      case '_':
+	      case '!':
+		if (strchr(natstr, type)) {
+#ifdef NATINT_PACK
+		    natint = 1;
+#endif
+		    p++;
+		}
+		else {
+		    rb_raise(rb_eArgError, "'%c' allowed only after types %s", *p, natstr);
+		}
+		goto modifiers;
+
+	      case '<':
+	      case '>':
+		if (!strchr(endstr, type)) {
+		    rb_raise(rb_eArgError, "'%c' allowed only after types %s", *p, endstr);
+		}
+		if (explicit_endian) {
+		    rb_raise(rb_eRangeError, "Can't use both '<' and '>'");
+		}
+		explicit_endian = *p++;
+		goto modifiers;
+	    }
+	}
+
+	if (*p == '*') {	/* set data length */
+	    len = strchr("@Xxu", type) ? 0
+                : strchr("PMm", type) ? 1
+                : items;
+	    p++;
+	}
+	else if (ISDIGIT(*p)) {
+	    errno = 0;
+	    len = STRTOUL(p, (char**)&p, 10);
+	    if (errno) {
+		rb_raise(rb_eRangeError, "pack length too big");
+	    }
+	}
+	else {
+	    len = 1;
+	}
+
+	switch (type) {
+	  case 'U':
+	    /* if encoding is US-ASCII, upgrade to UTF-8 */
+	    if (enc_info == 1) enc_info = 2;
+	    break;
+	  case 'm': case 'M': case 'u':
+	    /* keep US-ASCII (do nothing) */
+	    break;
+	  default:
+	    /* fall back to BINARY */
+	    enc_info = 0;
+	    break;
+	}
+	switch (type) {
+	  case 'A': case 'a': case 'Z':
+	  case 'B': case 'b':
+	  case 'H': case 'h':
+	    from = NEXTFROM;
+	    if (NIL_P(from)) {
+		ptr = "";
+		plen = 0;
+	    }
+	    else {
+		StringValue(from);
+		ptr = RSTRING_PTR(from);
+		plen = RSTRING_LEN(from);
+		OBJ_INFECT(res, from);
+	    }
+
+	    if (p[-1] == '*')
+		len = plen;
+
+	    switch (type) {
+	      case 'a':		/* arbitrary binary string (null padded)  */
+	      case 'A':         /* arbitrary binary string (ASCII space padded) */
+	      case 'Z':         /* null terminated string  */
+		if (plen >= len) {
+		    rb_str_buf_cat(res, ptr, len);
+		    if (p[-1] == '*' && type == 'Z')
+			rb_str_buf_cat(res, nul10, 1);
+		}
+		else {
+		    rb_str_buf_cat(res, ptr, plen);
+		    len -= plen;
+		    while (len >= 10) {
+			rb_str_buf_cat(res, (type == 'A')?spc10:nul10, 10);
+			len -= 10;
+		    }
+		    rb_str_buf_cat(res, (type == 'A')?spc10:nul10, len);
+		}
+		break;
+
+#define castchar(from) (char)((from) & 0xff)
+
+	      case 'b':		/* bit string (ascending) */
+		{
+		    int byte = 0;
+		    long i, j = 0;
+
+		    if (len > plen) {
+			j = (len - plen + 1)/2;
+			len = plen;
+		    }
+		    for (i=0; i++ < len; ptr++) {
+			if (*ptr & 1)
+			    byte |= 128;
+			if (i & 7)
+			    byte >>= 1;
+			else {
+			    char c = castchar(byte);
+			    rb_str_buf_cat(res, &c, 1);
+			    byte = 0;
+			}
+		    }
+		    if (len & 7) {
+			char c;
+			byte >>= 7 - (len & 7);
+			c = castchar(byte);
+			rb_str_buf_cat(res, &c, 1);
+		    }
+		    len = j;
+		    goto grow;
+		}
+		break;
+
+	      case 'B':		/* bit string (descending) */
+		{
+		    int byte = 0;
+		    long i, j = 0;
+
+		    if (len > plen) {
+			j = (len - plen + 1)/2;
+			len = plen;
+		    }
+		    for (i=0; i++ < len; ptr++) {
+			byte |= *ptr & 1;
+			if (i & 7)
+			    byte <<= 1;
+			else {
+			    char c = castchar(byte);
+			    rb_str_buf_cat(res, &c, 1);
+			    byte = 0;
+			}
+		    }
+		    if (len & 7) {
+			char c;
+			byte <<= 7 - (len & 7);
+			c = castchar(byte);
+			rb_str_buf_cat(res, &c, 1);
+		    }
+		    len = j;
+		    goto grow;
+		}
+		break;
+
+	      case 'h':		/* hex string (low nibble first) */
+		{
+		    int byte = 0;
+		    long i, j = 0;
+
+		    if (len > plen) {
+			j = (len + 1) / 2 - (plen + 1) / 2;
+			len = plen;
+		    }
+		    for (i=0; i++ < len; ptr++) {
+			if (ISALPHA(*ptr))
+			    byte |= (((*ptr & 15) + 9) & 15) << 4;
+			else
+			    byte |= (*ptr & 15) << 4;
+			if (i & 1)
+			    byte >>= 4;
+			else {
+			    char c = castchar(byte);
+			    rb_str_buf_cat(res, &c, 1);
+			    byte = 0;
+			}
+		    }
+		    if (len & 1) {
+			char c = castchar(byte);
+			rb_str_buf_cat(res, &c, 1);
+		    }
+		    len = j;
+		    goto grow;
+		}
+		break;
+
+	      case 'H':		/* hex string (high nibble first) */
+		{
+		    int byte = 0;
+		    long i, j = 0;
+
+		    if (len > plen) {
+			j = (len + 1) / 2 - (plen + 1) / 2;
+			len = plen;
+		    }
+		    for (i=0; i++ < len; ptr++) {
+			if (ISALPHA(*ptr))
+			    byte |= ((*ptr & 15) + 9) & 15;
+			else
+			    byte |= *ptr & 15;
+			if (i & 1)
+			    byte <<= 4;
+			else {
+			    char c = castchar(byte);
+			    rb_str_buf_cat(res, &c, 1);
+			    byte = 0;
+			}
+		    }
+		    if (len & 1) {
+			char c = castchar(byte);
+			rb_str_buf_cat(res, &c, 1);
+		    }
+		    len = j;
+		    goto grow;
+		}
+		break;
+	    }
+	    break;
+
+	  case 'c':		/* signed char */
+	  case 'C':		/* unsigned char */
+            integer_size = 1;
+            bigendian_p = BIGENDIAN_P(); /* not effective */
+            goto pack_integer;
+
+	  case 's':		/* s for int16_t, s! for signed short */
+            integer_size = NATINT_LEN(short, 2);
+            bigendian_p = BIGENDIAN_P();
+            goto pack_integer;
+
+	  case 'S':		/* S for uint16_t, S! for unsigned short */
+            integer_size = NATINT_LEN(short, 2);
+            bigendian_p = BIGENDIAN_P();
+            goto pack_integer;
+
+	  case 'i':		/* i and i! for signed int */
+            integer_size = (int)sizeof(int);
+            bigendian_p = BIGENDIAN_P();
+            goto pack_integer;
+
+	  case 'I':		/* I and I! for unsigned int */
+            integer_size = (int)sizeof(int);
+            bigendian_p = BIGENDIAN_P();
+            goto pack_integer;
+
+	  case 'l':		/* l for int32_t, l! for signed long */
+            integer_size = NATINT_LEN(long, 4);
+            bigendian_p = BIGENDIAN_P();
+            goto pack_integer;
+
+	  case 'L':		/* L for uint32_t, L! for unsigned long */
+            integer_size = NATINT_LEN(long, 4);
+            bigendian_p = BIGENDIAN_P();
+            goto pack_integer;
+
+	  case 'q':		/* q for int64_t, q! for signed long long */
+	    integer_size = NATINT_LEN_Q;
+            bigendian_p = BIGENDIAN_P();
+            goto pack_integer;
+
+	  case 'Q':		/* Q for uint64_t, Q! for unsigned long long */
+	    integer_size = NATINT_LEN_Q;
+            bigendian_p = BIGENDIAN_P();
+            goto pack_integer;
+
+	  case 'n':		/* 16 bit (2 bytes) integer (network byte-order)  */
+            integer_size = 2;
+            bigendian_p = 1;
+            goto pack_integer;
+
+	  case 'N':		/* 32 bit (4 bytes) integer (network byte-order) */
+            integer_size = 4;
+            bigendian_p = 1;
+            goto pack_integer;
+
+	  case 'v':		/* 16 bit (2 bytes) integer (VAX byte-order) */
+            integer_size = 2;
+            bigendian_p = 0;
+            goto pack_integer;
+
+	  case 'V':		/* 32 bit (4 bytes) integer (VAX byte-order) */
+            integer_size = 4;
+            bigendian_p = 0;
+            goto pack_integer;
+
+          pack_integer:
+	    if (explicit_endian) {
+		bigendian_p = explicit_endian == '>';
+	    }
+            if (integer_size > MAX_INTEGER_PACK_SIZE)
+                rb_bug("unexpected intger size for pack: %d", integer_size);
+            while (len-- > 0) {
+                char intbuf[MAX_INTEGER_PACK_SIZE];
+
+                from = NEXTFROM;
+                rb_integer_pack(from, intbuf, integer_size, 1, 0,
+                    INTEGER_PACK_2COMP |
+                    (bigendian_p ? INTEGER_PACK_BIG_ENDIAN : INTEGER_PACK_LITTLE_ENDIAN));
+                rb_str_buf_cat(res, intbuf, integer_size);
+            }
+	    break;
+
+	  case 'f':		/* single precision float in native format */
+	  case 'F':		/* ditto */
+	    while (len-- > 0) {
+		float f;
+
+		from = NEXTFROM;
+		f = (float)RFLOAT_VALUE(rb_to_float(from));
+		rb_str_buf_cat(res, (char*)&f, sizeof(float));
+	    }
+	    break;
+
+	  case 'e':		/* single precision float in VAX byte-order */
+	    while (len-- > 0) {
+		float f;
+		FLOAT_CONVWITH(ftmp);
+
+		from = NEXTFROM;
+		f = (float)RFLOAT_VALUE(rb_to_float(from));
+		f = HTOVF(f,ftmp);
+		rb_str_buf_cat(res, (char*)&f, sizeof(float));
+	    }
+	    break;
+
+	  case 'E':		/* double precision float in VAX byte-order */
+	    while (len-- > 0) {
+		double d;
+		DOUBLE_CONVWITH(dtmp);
+
+		from = NEXTFROM;
+		d = RFLOAT_VALUE(rb_to_float(from));
+		d = HTOVD(d,dtmp);
+		rb_str_buf_cat(res, (char*)&d, sizeof(double));
+	    }
+	    break;
+
+	  case 'd':		/* double precision float in native format */
+	  case 'D':		/* ditto */
+	    while (len-- > 0) {
+		double d;
+
+		from = NEXTFROM;
+		d = RFLOAT_VALUE(rb_to_float(from));
+		rb_str_buf_cat(res, (char*)&d, sizeof(double));
+	    }
+	    break;
+
+	  case 'g':		/* single precision float in network byte-order */
+	    while (len-- > 0) {
+		float f;
+		FLOAT_CONVWITH(ftmp);
+
+		from = NEXTFROM;
+		f = (float)RFLOAT_VALUE(rb_to_float(from));
+		f = HTONF(f,ftmp);
+		rb_str_buf_cat(res, (char*)&f, sizeof(float));
+	    }
+	    break;
+
+	  case 'G':		/* double precision float in network byte-order */
+	    while (len-- > 0) {
+		double d;
+		DOUBLE_CONVWITH(dtmp);
+
+		from = NEXTFROM;
+		d = RFLOAT_VALUE(rb_to_float(from));
+		d = HTOND(d,dtmp);
+		rb_str_buf_cat(res, (char*)&d, sizeof(double));
+	    }
+	    break;
+
+	  case 'x':		/* null byte */
+	  grow:
+	    while (len >= 10) {
+		rb_str_buf_cat(res, nul10, 10);
+		len -= 10;
+	    }
+	    rb_str_buf_cat(res, nul10, len);
+	    break;
+
+	  case 'X':		/* back up byte */
+	  shrink:
+	    plen = RSTRING_LEN(res);
+	    if (plen < len)
+		rb_raise(rb_eArgError, "X outside of string");
+	    rb_str_set_len(res, plen - len);
+	    break;
+
+	  case '@':		/* null fill to absolute position */
+	    len -= RSTRING_LEN(res);
+	    if (len > 0) goto grow;
+	    len = -len;
+	    if (len > 0) goto shrink;
+	    break;
+
+	  case '%':
+	    rb_raise(rb_eArgError, "%% is not supported");
+	    break;
+
+	  case 'U':		/* Unicode character */
+	    while (len-- > 0) {
+		SIGNED_VALUE l;
+		char buf[8];
+		int le;
+
+		from = NEXTFROM;
+		from = rb_to_int(from);
+		l = NUM2LONG(from);
+		if (l < 0) {
+		    rb_raise(rb_eRangeError, "pack(U): value out of range");
+		}
+		le = rb_uv_to_utf8(buf, l);
+		rb_str_buf_cat(res, (char*)buf, le);
+	    }
+	    break;
+
+	  case 'u':		/* uuencoded string */
+	  case 'm':		/* base64 encoded string */
+	    from = NEXTFROM;
+	    StringValue(from);
+	    ptr = RSTRING_PTR(from);
+	    plen = RSTRING_LEN(from);
+
+	    if (len == 0 && type == 'm') {
+		encodes(res, ptr, plen, type, 0);
+		ptr += plen;
+		break;
+	    }
+	    if (len <= 2)
+		len = 45;
+	    else if (len > 63 && type == 'u')
+		len = 63;
+	    else
+		len = len / 3 * 3;
+	    while (plen > 0) {
+		long todo;
+
+		if (plen > len)
+		    todo = len;
+		else
+		    todo = plen;
+		encodes(res, ptr, todo, type, 1);
+		plen -= todo;
+		ptr += todo;
+	    }
+	    break;
+
+	  case 'M':		/* quoted-printable encoded string */
+	    from = rb_obj_as_string(NEXTFROM);
+	    if (len <= 1)
+		len = 72;
+	    qpencode(res, from, len);
+	    break;
+
+	  case 'P':		/* pointer to packed byte string */
+	    from = THISFROM;
+	    if (!NIL_P(from)) {
+		StringValue(from);
+		if (RSTRING_LEN(from) < len) {
+		    rb_raise(rb_eArgError, "too short buffer for P(%ld for %ld)",
+			     RSTRING_LEN(from), len);
+		}
+	    }
+	    len = 1;
+	    /* FALL THROUGH */
+	  case 'p':		/* pointer to string */
+	    while (len-- > 0) {
+		char *t;
+		from = NEXTFROM;
+		if (NIL_P(from)) {
+		    t = 0;
+		}
+		else {
+		    t = StringValuePtr(from);
+		    rb_obj_taint(from);
+		}
+		if (!associates) {
+		    associates = rb_ary_new();
+		}
+		rb_ary_push(associates, from);
+		rb_str_buf_cat(res, (char*)&t, sizeof(char*));
+	    }
+	    break;
+
+	  case 'w':		/* BER compressed integer  */
+	    while (len-- > 0) {
+		VALUE buf = rb_str_new(0, 0);
+                size_t numbytes;
+                int sign;
+                char *cp;
+
+		from = NEXTFROM;
+                from = rb_to_int(from);
+                numbytes = rb_absint_numwords(from, 7, NULL);
+                if (numbytes == 0)
+                    numbytes = 1;
+                buf = rb_str_new(NULL, numbytes);
+
+                sign = rb_integer_pack(from, RSTRING_PTR(buf), RSTRING_LEN(buf), 1, 1, INTEGER_PACK_BIG_ENDIAN);
+
+                if (sign < 0)
+                    rb_raise(rb_eArgError, "can't compress negative numbers");
+                if (sign == 2)
+                    rb_bug("buffer size problem?");
+
+                cp = RSTRING_PTR(buf);
+                while (1 < numbytes) {
+                  *cp |= 0x80;
+                  cp++;
+                  numbytes--;
+                }
+
+                rb_str_buf_cat(res, RSTRING_PTR(buf), RSTRING_LEN(buf));
+	    }
+	    break;
+
+	  default: {
+	    char unknown[5];
+	    if (ISPRINT(type)) {
+		unknown[0] = type;
+		unknown[1] = '\0';
+	    }
+	    else {
+		snprintf(unknown, sizeof(unknown), "\\x%.2x", type & 0xff);
+	    }
+	    rb_warning("unknown pack directive '%s' in '% "PRIsVALUE"'",
+		       unknown, fmt);
+	    break;
+	  }
+	}
+    }
+
+    if (associates) {
+	str_associate(res, associates);
+    }
+    OBJ_INFECT(res, fmt);
+    switch (enc_info) {
+      case 1:
+	ENCODING_CODERANGE_SET(res, rb_usascii_encindex(), ENC_CODERANGE_7BIT);
+	break;
+      case 2:
+	rb_enc_set_index(res, rb_utf8_encindex());
+	break;
+      default:
+	/* do nothing, keep ASCII-8BIT */
+	break;
+    }
+    return res;
+}
+
+static const char uu_table[] =
+"`!\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_";
+static const char b64_table[] =
+"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+static void
+encodes(VALUE str, const char *s0, long len, int type, int tail_lf)
+{
+    enum {buff_size = 4096, encoded_unit = 4, input_unit = 3};
+    char buff[buff_size + 1];	/* +1 for tail_lf */
+    long i = 0;
+    const char *const trans = type == 'u' ? uu_table : b64_table;
+    char padding;
+    const unsigned char *s = (const unsigned char *)s0;
+
+    if (type == 'u') {
+	buff[i++] = (char)len + ' ';
+	padding = '`';
+    }
+    else {
+	padding = '=';
+    }
+    while (len >= input_unit) {
+        while (len >= input_unit && buff_size-i >= encoded_unit) {
+            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 += input_unit;
+            len -= input_unit;
+        }
+        if (buff_size-i < encoded_unit) {
+            rb_str_buf_cat(str, buff, i);
+            i = 0;
+        }
+    }
+
+    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;
+    }
+    if (tail_lf) buff[i++] = '\n';
+    rb_str_buf_cat(str, buff, i);
+    if ((size_t)i > sizeof(buff)) rb_bug("encodes() buffer overrun");
+}
+
+static const char hex_table[] = "0123456789ABCDEF";
+
+static void
+qpencode(VALUE str, VALUE from, long len)
+{
+    char buff[1024];
+    long i = 0, n = 0, prev = EOF;
+    unsigned char *s = (unsigned char*)RSTRING_PTR(from);
+    unsigned char *send = s + RSTRING_LEN(from);
+
+    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_buf_cat(str, buff, i);
+	    i = 0;
+	}
+	s++;
+    }
+    if (n > 0) {
+	buff[i++] = '=';
+	buff[i++] = '\n';
+    }
+    if (i > 0) {
+	rb_str_buf_cat(str, buff, i);
+    }
+}
+
+static inline int
+hex2num(char c)
+{
+    int n;
+    n = ruby_digit36_to_number_table[(unsigned char)c];
+    if (16 <= n)
+        n = -1;
+    return n;
+}
+
+#define PACK_LENGTH_ADJUST_SIZE(sz) do {	\
+    tmp_len = 0;				\
+    if (len > (long)((send-s)/(sz))) {		\
+        if (!star) {				\
+	    tmp_len = len-(send-s)/(sz);		\
+        }					\
+	len = (send-s)/(sz);			\
+    }						\
+} while (0)
+
+#define PACK_ITEM_ADJUST() do { \
+    if (tmp_len > 0 && !block_p) \
+	rb_ary_store(ary, RARRAY_LEN(ary)+tmp_len-1, Qnil); \
+} while (0)
+
+static VALUE
+infected_str_new(const char *ptr, long len, VALUE str)
+{
+    VALUE s = rb_str_new(ptr, len);
+
+    OBJ_INFECT(s, str);
+    return s;
+}
+
+/*
+ *  call-seq:
+ *     str.unpack(format)    ->  anArray
+ *
+ *  Decodes <i>str</i> (which may contain binary data) according to the
+ *  format string, returning an array of each value extracted. The
+ *  format string consists of a sequence of single-character directives,
+ *  summarized in the table at the end of this entry.
+ *  Each directive may be followed
+ *  by a number, indicating the number of times to repeat with this
+ *  directive. An asterisk (``<code>*</code>'') will use up all
+ *  remaining elements. The directives <code>sSiIlL</code> may each be
+ *  followed by an underscore (``<code>_</code>'') or
+ *  exclamation mark (``<code>!</code>'') to use the underlying
+ *  platform's native size for the specified type; otherwise, it uses a
+ *  platform-independent consistent size. Spaces are ignored in the
+ *  format string. See also <code>Array#pack</code>.
+ *
+ *     "abc \0\0abc \0\0".unpack('A6Z6')   #=> ["abc", "abc "]
+ *     "abc \0\0".unpack('a3a3')           #=> ["abc", " \000\000"]
+ *     "abc \0abc \0".unpack('Z*Z*')       #=> ["abc ", "abc "]
+ *     "aa".unpack('b8B8')                 #=> ["10000110", "01100001"]
+ *     "aaa".unpack('h2H2c')               #=> ["16", "61", 97]
+ *     "\xfe\xff\xfe\xff".unpack('sS')     #=> [-2, 65534]
+ *     "now=20is".unpack('M*')             #=> ["now is"]
+ *     "whole".unpack('xax2aX2aX1aX2a')    #=> ["h", "e", "l", "l", "o"]
+ *
+ *  This table summarizes the various formats and the Ruby classes
+ *  returned by each.
+ *
+ *   Integer      |         |
+ *   Directive    | Returns | Meaning
+ *   -----------------------------------------------------------------
+ *      C         | Integer | 8-bit unsigned (unsigned char)
+ *      S         | Integer | 16-bit unsigned, native endian (uint16_t)
+ *      L         | Integer | 32-bit unsigned, native endian (uint32_t)
+ *      Q         | Integer | 64-bit unsigned, native endian (uint64_t)
+ *                |         |
+ *      c         | Integer | 8-bit signed (signed char)
+ *      s         | Integer | 16-bit signed, native endian (int16_t)
+ *      l         | Integer | 32-bit signed, native endian (int32_t)
+ *      q         | Integer | 64-bit signed, native endian (int64_t)
+ *                |         |
+ *      S_, S!    | Integer | unsigned short, native endian
+ *      I, I_, I! | Integer | unsigned int, native endian
+ *      L_, L!    | Integer | unsigned long, native endian
+ *      Q_, Q!    | Integer | unsigned long long, native endian (ArgumentError
+ *                |         | if the platform has no long long type.)
+ *                |         | (Q_ and Q! is available since Ruby 2.1.)
+ *                |         |
+ *      s_, s!    | Integer | signed short, native endian
+ *      i, i_, i! | Integer | signed int, native endian
+ *      l_, l!    | Integer | signed long, native endian
+ *      q_, q!    | Integer | signed long long, native endian (ArgumentError
+ *                |         | if the platform has no long long type.)
+ *                |         | (q_ and q! is available since Ruby 2.1.)
+ *                |         |
+ *      S> L> Q>  | Integer | same as the directives without ">" except
+ *      s> l> q>  |         | big endian
+ *      S!> I!>   |         | (available since Ruby 1.9.3)
+ *      L!> Q!>   |         | "S>" is same as "n"
+ *      s!> i!>   |         | "L>" is same as "N"
+ *      l!> q!>   |         |
+ *                |         |
+ *      S< L< Q<  | Integer | same as the directives without "<" except
+ *      s< l< q<  |         | little endian
+ *      S!< I!<   |         | (available since Ruby 1.9.3)
+ *      L!< Q!<   |         | "S<" is same as "v"
+ *      s!< i!<   |         | "L<" is same as "V"
+ *      l!< q!<   |         |
+ *                |         |
+ *      n         | Integer | 16-bit unsigned, network (big-endian) byte order
+ *      N         | Integer | 32-bit unsigned, network (big-endian) byte order
+ *      v         | Integer | 16-bit unsigned, VAX (little-endian) byte order
+ *      V         | Integer | 32-bit unsigned, VAX (little-endian) byte order
+ *                |         |
+ *      U         | Integer | UTF-8 character
+ *      w         | Integer | BER-compressed integer (see Array.pack)
+ *
+ *   Float        |         |
+ *   Directive    | Returns | Meaning
+ *   -----------------------------------------------------------------
+ *      D, d      | Float   | double-precision, native format
+ *      F, f      | Float   | single-precision, native format
+ *      E         | Float   | double-precision, little-endian byte order
+ *      e         | Float   | single-precision, little-endian byte order
+ *      G         | Float   | double-precision, network (big-endian) byte order
+ *      g         | Float   | single-precision, network (big-endian) byte order
+ *
+ *   String       |         |
+ *   Directive    | Returns | Meaning
+ *   -----------------------------------------------------------------
+ *      A         | String  | arbitrary binary string (remove trailing nulls and ASCII spaces)
+ *      a         | String  | arbitrary binary string
+ *      Z         | String  | null-terminated string
+ *      B         | String  | bit string (MSB first)
+ *      b         | String  | bit string (LSB first)
+ *      H         | String  | hex string (high nibble first)
+ *      h         | String  | hex string (low nibble first)
+ *      u         | String  | UU-encoded string
+ *      M         | String  | quoted-printable, MIME encoding (see RFC2045)
+ *      m         | String  | base64 encoded string (RFC 2045) (default)
+ *                |         | base64 encoded string (RFC 4648) if followed by 0
+ *      P         | String  | pointer to a structure (fixed-length string)
+ *      p         | String  | pointer to a null-terminated string
+ *
+ *   Misc.        |         |
+ *   Directive    | Returns | Meaning
+ *   -----------------------------------------------------------------
+ *      @         | ---     | skip to the offset given by the length argument
+ *      X         | ---     | skip backward one byte
+ *      x         | ---     | skip forward one byte
+ */
+
+static VALUE
+pack_unpack(VALUE str, VALUE fmt)
+{
+    static const char hexdigits[] = "0123456789abcdef";
+    char *s, *send;
+    char *p, *pend;
+    VALUE ary;
+    char type;
+    long len, tmp_len;
+    int star;
+#ifdef NATINT_PACK
+    int natint;			/* native integer */
+#endif
+    int block_p = rb_block_given_p();
+    int signed_p, integer_size, bigendian_p;
+#define UNPACK_PUSH(item) do {\
+	VALUE item_val = (item);\
+	if (block_p) {\
+	    rb_yield(item_val);\
+	}\
+	else {\
+	    rb_ary_push(ary, item_val);\
+	}\
+    } while (0)
+
+    StringValue(str);
+    StringValue(fmt);
+    s = RSTRING_PTR(str);
+    send = s + RSTRING_LEN(str);
+    p = RSTRING_PTR(fmt);
+    pend = p + RSTRING_LEN(fmt);
+
+    ary = block_p ? Qnil : rb_ary_new();
+    while (p < pend) {
+	int explicit_endian = 0;
+	type = *p++;
+#ifdef NATINT_PACK
+	natint = 0;
+#endif
+
+	if (ISSPACE(type)) continue;
+	if (type == '#') {
+	    while ((p < pend) && (*p != '\n')) {
+		p++;
+	    }
+	    continue;
+	}
+
+	star = 0;
+	{
+          modifiers:
+	    switch (*p) {
+	      case '_':
+	      case '!':
+
+		if (strchr(natstr, type)) {
+#ifdef NATINT_PACK
+		    natint = 1;
+#endif
+		    p++;
+		}
+		else {
+		    rb_raise(rb_eArgError, "'%c' allowed only after types %s", *p, natstr);
+		}
+		goto modifiers;
+
+	      case '<':
+	      case '>':
+		if (!strchr(endstr, type)) {
+		    rb_raise(rb_eArgError, "'%c' allowed only after types %s", *p, endstr);
+		}
+		if (explicit_endian) {
+		    rb_raise(rb_eRangeError, "Can't use both '<' and '>'");
+		}
+		explicit_endian = *p++;
+		goto modifiers;
+	    }
+	}
+
+	if (p >= pend)
+	    len = 1;
+	else if (*p == '*') {
+	    star = 1;
+	    len = send - s;
+	    p++;
+	}
+	else if (ISDIGIT(*p)) {
+	    errno = 0;
+	    len = STRTOUL(p, (char**)&p, 10);
+	    if (errno) {
+		rb_raise(rb_eRangeError, "pack length too big");
+	    }
+	}
+	else {
+	    len = (type != '@');
+	}
+
+	switch (type) {
+	  case '%':
+	    rb_raise(rb_eArgError, "%% is not supported");
+	    break;
+
+	  case 'A':
+	    if (len > send - s) len = send - s;
+	    {
+		long end = len;
+		char *t = s + len - 1;
+
+		while (t >= s) {
+		    if (*t != ' ' && *t != '\0') break;
+		    t--; len--;
+		}
+		UNPACK_PUSH(infected_str_new(s, len, str));
+		s += end;
+	    }
+	    break;
+
+	  case 'Z':
+	    {
+		char *t = s;
+
+		if (len > send-s) len = send-s;
+		while (t < s+len && *t) t++;
+		UNPACK_PUSH(infected_str_new(s, t-s, str));
+		if (t < send) t++;
+		s = star ? t : s+len;
+	    }
+	    break;
+
+	  case 'a':
+	    if (len > send - s) len = send - s;
+	    UNPACK_PUSH(infected_str_new(s, len, str));
+	    s += len;
+	    break;
+
+	  case 'b':
+	    {
+		VALUE bitstr;
+		char *t;
+		int bits;
+		long i;
+
+		if (p[-1] == '*' || len > (send - s) * 8)
+		    len = (send - s) * 8;
+		bits = 0;
+		UNPACK_PUSH(bitstr = rb_usascii_str_new(0, len));
+		t = RSTRING_PTR(bitstr);
+		for (i=0; i<len; i++) {
+		    if (i & 7) bits >>= 1;
+		    else bits = (unsigned char)*s++;
+		    *t++ = (bits & 1) ? '1' : '0';
+		}
+	    }
+	    break;
+
+	  case 'B':
+	    {
+		VALUE bitstr;
+		char *t;
+		int bits;
+		long i;
+
+		if (p[-1] == '*' || len > (send - s) * 8)
+		    len = (send - s) * 8;
+		bits = 0;
+		UNPACK_PUSH(bitstr = rb_usascii_str_new(0, len));
+		t = RSTRING_PTR(bitstr);
+		for (i=0; i<len; i++) {
+		    if (i & 7) bits <<= 1;
+		    else bits = (unsigned char)*s++;
+		    *t++ = (bits & 128) ? '1' : '0';
+		}
+	    }
+	    break;
+
+	  case 'h':
+	    {
+		VALUE bitstr;
+		char *t;
+		int bits;
+		long i;
+
+		if (p[-1] == '*' || len > (send - s) * 2)
+		    len = (send - s) * 2;
+		bits = 0;
+		UNPACK_PUSH(bitstr = rb_usascii_str_new(0, len));
+		t = RSTRING_PTR(bitstr);
+		for (i=0; i<len; i++) {
+		    if (i & 1)
+			bits >>= 4;
+		    else
+			bits = (unsigned char)*s++;
+		    *t++ = hexdigits[bits & 15];
+		}
+	    }
+	    break;
+
+	  case 'H':
+	    {
+		VALUE bitstr;
+		char *t;
+		int bits;
+		long i;
+
+		if (p[-1] == '*' || len > (send - s) * 2)
+		    len = (send - s) * 2;
+		bits = 0;
+		UNPACK_PUSH(bitstr = rb_usascii_str_new(0, len));
+		t = RSTRING_PTR(bitstr);
+		for (i=0; i<len; i++) {
+		    if (i & 1)
+			bits <<= 4;
+		    else
+			bits = (unsigned char)*s++;
+		    *t++ = hexdigits[(bits >> 4) & 15];
+		}
+	    }
+	    break;
+
+	  case 'c':
+	    signed_p = 1;
+	    integer_size = 1;
+	    bigendian_p = BIGENDIAN_P(); /* not effective */
+	    goto unpack_integer;
+
+	  case 'C':
+	    signed_p = 0;
+	    integer_size = 1;
+	    bigendian_p = BIGENDIAN_P(); /* not effective */
+	    goto unpack_integer;
+
+	  case 's':
+	    signed_p = 1;
+	    integer_size = NATINT_LEN(short, 2);
+	    bigendian_p = BIGENDIAN_P();
+	    goto unpack_integer;
+
+	  case 'S':
+	    signed_p = 0;
+	    integer_size = NATINT_LEN(short, 2);
+	    bigendian_p = BIGENDIAN_P();
+	    goto unpack_integer;
+
+	  case 'i':
+	    signed_p = 1;
+	    integer_size = (int)sizeof(int);
+	    bigendian_p = BIGENDIAN_P();
+	    goto unpack_integer;
+
+	  case 'I':
+	    signed_p = 0;
+	    integer_size = (int)sizeof(int);
+	    bigendian_p = BIGENDIAN_P();
+	    goto unpack_integer;
+
+	  case 'l':
+	    signed_p = 1;
+	    integer_size = NATINT_LEN(long, 4);
+	    bigendian_p = BIGENDIAN_P();
+	    goto unpack_integer;
+
+	  case 'L':
+	    signed_p = 0;
+	    integer_size = NATINT_LEN(long, 4);
+	    bigendian_p = BIGENDIAN_P();
+	    goto unpack_integer;
+
+	  case 'q':
+	    signed_p = 1;
+	    integer_size = NATINT_LEN_Q;
+	    bigendian_p = BIGENDIAN_P();
+	    goto unpack_integer;
+
+	  case 'Q':
+	    signed_p = 0;
+	    integer_size = NATINT_LEN_Q;
+	    bigendian_p = BIGENDIAN_P();
+	    goto unpack_integer;
+
+	  case 'n':
+	    signed_p = 0;
+	    integer_size = 2;
+	    bigendian_p = 1;
+	    goto unpack_integer;
+
+	  case 'N':
+	    signed_p = 0;
+	    integer_size = 4;
+	    bigendian_p = 1;
+	    goto unpack_integer;
+
+	  case 'v':
+	    signed_p = 0;
+	    integer_size = 2;
+	    bigendian_p = 0;
+	    goto unpack_integer;
+
+	  case 'V':
+	    signed_p = 0;
+	    integer_size = 4;
+	    bigendian_p = 0;
+	    goto unpack_integer;
+
+	  unpack_integer:
+	    if (explicit_endian) {
+		bigendian_p = explicit_endian == '>';
+	    }
+            PACK_LENGTH_ADJUST_SIZE(integer_size);
+            while (len-- > 0) {
+                int flags = bigendian_p ? INTEGER_PACK_BIG_ENDIAN : INTEGER_PACK_LITTLE_ENDIAN;
+                VALUE val;
+                if (signed_p)
+                    flags |= INTEGER_PACK_2COMP;
+                val = rb_integer_unpack(s, integer_size, 1, 0, flags);
+                UNPACK_PUSH(val);
+                s += integer_size;
+            }
+            PACK_ITEM_ADJUST();
+            break;
+
+	  case 'f':
+	  case 'F':
+	    PACK_LENGTH_ADJUST_SIZE(sizeof(float));
+	    while (len-- > 0) {
+		float tmp;
+		memcpy(&tmp, s, sizeof(float));
+		s += sizeof(float);
+		UNPACK_PUSH(DBL2NUM((double)tmp));
+	    }
+	    PACK_ITEM_ADJUST();
+	    break;
+
+	  case 'e':
+	    PACK_LENGTH_ADJUST_SIZE(sizeof(float));
+	    while (len-- > 0) {
+	        float tmp;
+		FLOAT_CONVWITH(ftmp);
+
+		memcpy(&tmp, s, sizeof(float));
+		s += sizeof(float);
+		tmp = VTOHF(tmp,ftmp);
+		UNPACK_PUSH(DBL2NUM((double)tmp));
+	    }
+	    PACK_ITEM_ADJUST();
+	    break;
+
+	  case 'E':
+	    PACK_LENGTH_ADJUST_SIZE(sizeof(double));
+	    while (len-- > 0) {
+		double tmp;
+		DOUBLE_CONVWITH(dtmp);
+
+		memcpy(&tmp, s, sizeof(double));
+		s += sizeof(double);
+		tmp = VTOHD(tmp,dtmp);
+		UNPACK_PUSH(DBL2NUM(tmp));
+	    }
+	    PACK_ITEM_ADJUST();
+	    break;
+
+	  case 'D':
+	  case 'd':
+	    PACK_LENGTH_ADJUST_SIZE(sizeof(double));
+	    while (len-- > 0) {
+		double tmp;
+		memcpy(&tmp, s, sizeof(double));
+		s += sizeof(double);
+		UNPACK_PUSH(DBL2NUM(tmp));
+	    }
+	    PACK_ITEM_ADJUST();
+	    break;
+
+	  case 'g':
+	    PACK_LENGTH_ADJUST_SIZE(sizeof(float));
+	    while (len-- > 0) {
+	        float tmp;
+		FLOAT_CONVWITH(ftmp);
+
+		memcpy(&tmp, s, sizeof(float));
+		s += sizeof(float);
+		tmp = NTOHF(tmp,ftmp);
+		UNPACK_PUSH(DBL2NUM((double)tmp));
+	    }
+	    PACK_ITEM_ADJUST();
+	    break;
+
+	  case 'G':
+	    PACK_LENGTH_ADJUST_SIZE(sizeof(double));
+	    while (len-- > 0) {
+		double tmp;
+		DOUBLE_CONVWITH(dtmp);
+
+		memcpy(&tmp, s, sizeof(double));
+		s += sizeof(double);
+		tmp = NTOHD(tmp,dtmp);
+		UNPACK_PUSH(DBL2NUM(tmp));
+	    }
+	    PACK_ITEM_ADJUST();
+	    break;
+
+	  case 'U':
+	    if (len > send - s) len = send - s;
+	    while (len > 0 && s < send) {
+		long alen = send - s;
+		unsigned long l;
+
+		l = utf8_to_uv(s, &alen);
+		s += alen; len--;
+		UNPACK_PUSH(ULONG2NUM(l));
+	    }
+	    break;
+
+	  case 'u':
+	    {
+		VALUE buf = infected_str_new(0, (send - s)*3/4, str);
+		char *ptr = RSTRING_PTR(buf);
+		long total = 0;
+
+		while (s < send && (unsigned char)*s > ' ' && (unsigned char)*s < 'a') {
+		    long a,b,c,d;
+		    char hunk[3];
+
+		    len = ((unsigned char)*s++ - ' ') & 077;
+
+		    total += len;
+		    if (total > RSTRING_LEN(buf)) {
+			len -= total - RSTRING_LEN(buf);
+			total = RSTRING_LEN(buf);
+		    }
+
+		    while (len > 0) {
+			long mlen = len > 3 ? 3 : len;
+
+			if (s < send && (unsigned char)*s >= ' ' && (unsigned char)*s < 'a')
+			    a = ((unsigned char)*s++ - ' ') & 077;
+			else
+			    a = 0;
+			if (s < send && (unsigned char)*s >= ' ' && (unsigned char)*s < 'a')
+			    b = ((unsigned char)*s++ - ' ') & 077;
+			else
+			    b = 0;
+			if (s < send && (unsigned char)*s >= ' ' && (unsigned char)*s < 'a')
+			    c = ((unsigned char)*s++ - ' ') & 077;
+			else
+			    c = 0;
+			if (s < send && (unsigned char)*s >= ' ' && (unsigned char)*s < 'a')
+			    d = ((unsigned char)*s++ - ' ') & 077;
+			else
+			    d = 0;
+			hunk[0] = (char)(a << 2 | b >> 4);
+			hunk[1] = (char)(b << 4 | c >> 2);
+			hunk[2] = (char)(c << 6 | d);
+			memcpy(ptr, hunk, mlen);
+			ptr += mlen;
+			len -= mlen;
+		    }
+		    if (s < send && (unsigned char)*s != '\r' && *s != '\n')
+			s++;	/* possible checksum byte */
+		    if (s < send && *s == '\r') s++;
+		    if (s < send && *s == '\n') s++;
+		}
+
+		rb_str_set_len(buf, total);
+		UNPACK_PUSH(buf);
+	    }
+	    break;
+
+	  case 'm':
+	    {
+		VALUE buf = infected_str_new(0, (send - s + 3)*3/4, str); /* +3 is for skipping paddings */
+		char *ptr = RSTRING_PTR(buf);
+		int a = -1,b = -1,c = 0,d = 0;
+		static signed char b64_xtable[256];
+
+		if (b64_xtable['/'] <= 0) {
+		    int i;
+
+		    for (i = 0; i < 256; i++) {
+			b64_xtable[i] = -1;
+		    }
+		    for (i = 0; i < 64; i++) {
+			b64_xtable[(unsigned char)b64_table[i]] = (char)i;
+		    }
+		}
+		if (len == 0) {
+		    while (s < send) {
+			a = b = c = d = -1;
+			a = b64_xtable[(unsigned char)*s++];
+			if (s >= send || a == -1) rb_raise(rb_eArgError, "invalid base64");
+			b = b64_xtable[(unsigned char)*s++];
+			if (s >= send || b == -1) rb_raise(rb_eArgError, "invalid base64");
+			if (*s == '=') {
+			    if (s + 2 == send && *(s + 1) == '=') break;
+			    rb_raise(rb_eArgError, "invalid base64");
+			}
+			c = b64_xtable[(unsigned char)*s++];
+			if (s >= send || c == -1) rb_raise(rb_eArgError, "invalid base64");
+			if (s + 1 == send && *s == '=') break;
+			d = b64_xtable[(unsigned char)*s++];
+			if (d == -1) rb_raise(rb_eArgError, "invalid base64");
+			*ptr++ = castchar(a << 2 | b >> 4);
+			*ptr++ = castchar(b << 4 | c >> 2);
+			*ptr++ = castchar(c << 6 | d);
+		    }
+		    if (c == -1) {
+			*ptr++ = castchar(a << 2 | b >> 4);
+			if (b & 0xf) rb_raise(rb_eArgError, "invalid base64");
+		    }
+		    else if (d == -1) {
+			*ptr++ = castchar(a << 2 | b >> 4);
+			*ptr++ = castchar(b << 4 | c >> 2);
+			if (c & 0x3) rb_raise(rb_eArgError, "invalid base64");
+		    }
+		}
+		else {
+		    while (s < send) {
+			a = b = c = d = -1;
+			while ((a = b64_xtable[(unsigned char)*s]) == -1 && s < send) {s++;}
+			if (s >= send) break;
+			s++;
+			while ((b = b64_xtable[(unsigned char)*s]) == -1 && s < send) {s++;}
+			if (s >= send) break;
+			s++;
+			while ((c = b64_xtable[(unsigned char)*s]) == -1 && s < send) {if (*s == '=') break; s++;}
+			if (*s == '=' || s >= send) break;
+			s++;
+			while ((d = b64_xtable[(unsigned char)*s]) == -1 && s < send) {if (*s == '=') break; s++;}
+			if (*s == '=' || s >= send) break;
+			s++;
+			*ptr++ = castchar(a << 2 | b >> 4);
+			*ptr++ = castchar(b << 4 | c >> 2);
+			*ptr++ = castchar(c << 6 | d);
+			a = -1;
+		    }
+		    if (a != -1 && b != -1) {
+			if (c == -1)
+			    *ptr++ = castchar(a << 2 | b >> 4);
+			else {
+			    *ptr++ = castchar(a << 2 | b >> 4);
+			    *ptr++ = castchar(b << 4 | c >> 2);
+			}
+		    }
+		}
+		rb_str_set_len(buf, ptr - RSTRING_PTR(buf));
+		UNPACK_PUSH(buf);
+	    }
+	    break;
+
+	  case 'M':
+	    {
+		VALUE buf = infected_str_new(0, send - s, str);
+		char *ptr = RSTRING_PTR(buf), *ss = s;
+		int c1, c2;
+
+		while (s < send) {
+		    if (*s == '=') {
+			if (++s == send) break;
+			if (s+1 < send && *s == '\r' && *(s+1) == '\n')
+			    s++;
+			if (*s != '\n') {
+			    if ((c1 = hex2num(*s)) == -1) break;
+			    if (++s == send) break;
+			    if ((c2 = hex2num(*s)) == -1) break;
+			    *ptr++ = castchar(c1 << 4 | c2);
+			}
+		    }
+		    else {
+			*ptr++ = *s;
+		    }
+		    s++;
+		    ss = s;
+		}
+		rb_str_set_len(buf, ptr - RSTRING_PTR(buf));
+		rb_str_buf_cat(buf, ss, send-ss);
+		ENCODING_CODERANGE_SET(buf, rb_ascii8bit_encindex(), ENC_CODERANGE_VALID);
+		UNPACK_PUSH(buf);
+	    }
+	    break;
+
+	  case '@':
+	    if (len > RSTRING_LEN(str))
+		rb_raise(rb_eArgError, "@ outside of string");
+	    s = RSTRING_PTR(str) + len;
+	    break;
+
+	  case 'X':
+	    if (len > s - RSTRING_PTR(str))
+		rb_raise(rb_eArgError, "X outside of string");
+	    s -= len;
+	    break;
+
+	  case 'x':
+	    if (len > send - s)
+		rb_raise(rb_eArgError, "x outside of string");
+	    s += len;
+	    break;
+
+	  case 'P':
+	    if (sizeof(char *) <= (size_t)(send - s)) {
+		VALUE tmp = Qnil;
+		char *t;
+
+		memcpy(&t, s, sizeof(char *));
+		s += sizeof(char *);
+
+		if (t) {
+		    VALUE a;
+		    const VALUE *p, *pend;
+
+		    if (!(a = str_associated(str))) {
+			rb_raise(rb_eArgError, "no associated pointer");
+		    }
+		    p = RARRAY_CONST_PTR(a);
+		    pend = p + RARRAY_LEN(a);
+		    while (p < pend) {
+			if (RB_TYPE_P(*p, T_STRING) && RSTRING_PTR(*p) == t) {
+			    if (len < RSTRING_LEN(*p)) {
+				tmp = rb_tainted_str_new(t, len);
+				str_associate(tmp, a);
+			    }
+			    else {
+				tmp = *p;
+			    }
+			    break;
+			}
+			p++;
+		    }
+		    if (p == pend) {
+			rb_raise(rb_eArgError, "non associated pointer");
+		    }
+		}
+		UNPACK_PUSH(tmp);
+	    }
+	    break;
+
+	  case 'p':
+	    if (len > (long)((send - s) / sizeof(char *)))
+		len = (send - s) / sizeof(char *);
+	    while (len-- > 0) {
+		if ((size_t)(send - s) < sizeof(char *))
+		    break;
+		else {
+		    VALUE tmp = Qnil;
+		    char *t;
+
+		    memcpy(&t, s, sizeof(char *));
+		    s += sizeof(char *);
+
+		    if (t) {
+			VALUE a;
+			const VALUE *p, *pend;
+
+			if (!(a = str_associated(str))) {
+			    rb_raise(rb_eArgError, "no associated pointer");
+			}
+			p = RARRAY_CONST_PTR(a);
+			pend = p + RARRAY_LEN(a);
+			while (p < pend) {
+			    if (RB_TYPE_P(*p, T_STRING) && RSTRING_PTR(*p) == t) {
+				tmp = *p;
+				break;
+			    }
+			    p++;
+			}
+			if (p == pend) {
+			    rb_raise(rb_eArgError, "non associated pointer");
+			}
+		    }
+		    UNPACK_PUSH(tmp);
+		}
+	    }
+	    break;
+
+	  case 'w':
+	    {
+                char *s0 = s;
+                while (len > 0 && s < send) {
+                    if (*s & 0x80) {
+                        s++;
+                    }
+                    else {
+                        s++;
+                        UNPACK_PUSH(rb_integer_unpack(s0, s-s0, 1, 1, INTEGER_PACK_BIG_ENDIAN));
+                        len--;
+                        s0 = s;
+                    }
+                }
+	    }
+	    break;
+
+	  default:
+	    rb_warning("unknown unpack directive '%c' in '%s'",
+		type, RSTRING_PTR(fmt));
+	    break;
+	}
+    }
+
+    return ary;
+}
+
+int
+rb_uv_to_utf8(char buf[6], unsigned long uv)
+{
+    if (uv <= 0x7f) {
+	buf[0] = (char)uv;
+	return 1;
+    }
+    if (uv <= 0x7ff) {
+	buf[0] = castchar(((uv>>6)&0xff)|0xc0);
+	buf[1] = castchar((uv&0x3f)|0x80);
+	return 2;
+    }
+    if (uv <= 0xffff) {
+	buf[0] = castchar(((uv>>12)&0xff)|0xe0);
+	buf[1] = castchar(((uv>>6)&0x3f)|0x80);
+	buf[2] = castchar((uv&0x3f)|0x80);
+	return 3;
+    }
+    if (uv <= 0x1fffff) {
+	buf[0] = castchar(((uv>>18)&0xff)|0xf0);
+	buf[1] = castchar(((uv>>12)&0x3f)|0x80);
+	buf[2] = castchar(((uv>>6)&0x3f)|0x80);
+	buf[3] = castchar((uv&0x3f)|0x80);
+	return 4;
+    }
+    if (uv <= 0x3ffffff) {
+	buf[0] = castchar(((uv>>24)&0xff)|0xf8);
+	buf[1] = castchar(((uv>>18)&0x3f)|0x80);
+	buf[2] = castchar(((uv>>12)&0x3f)|0x80);
+	buf[3] = castchar(((uv>>6)&0x3f)|0x80);
+	buf[4] = castchar((uv&0x3f)|0x80);
+	return 5;
+    }
+    if (uv <= 0x7fffffff) {
+	buf[0] = castchar(((uv>>30)&0xff)|0xfc);
+	buf[1] = castchar(((uv>>24)&0x3f)|0x80);
+	buf[2] = castchar(((uv>>18)&0x3f)|0x80);
+	buf[3] = castchar(((uv>>12)&0x3f)|0x80);
+	buf[4] = castchar(((uv>>6)&0x3f)|0x80);
+	buf[5] = castchar((uv&0x3f)|0x80);
+	return 6;
+    }
+    rb_raise(rb_eRangeError, "pack(U): value out of range");
+
+    UNREACHABLE;
+}
+
+static const unsigned long utf8_limits[] = {
+    0x0,			/* 1 */
+    0x80,			/* 2 */
+    0x800,			/* 3 */
+    0x10000,			/* 4 */
+    0x200000,			/* 5 */
+    0x4000000,			/* 6 */
+    0x80000000,			/* 7 */
+};
+
+static unsigned long
+utf8_to_uv(const char *p, long *lenp)
+{
+    int c = *p++ & 0xff;
+    unsigned long uv = c;
+    long n;
+
+    if (!(uv & 0x80)) {
+	*lenp = 1;
+        return uv;
+    }
+    if (!(uv & 0x40)) {
+	*lenp = 1;
+	rb_raise(rb_eArgError, "malformed UTF-8 character");
+    }
+
+    if      (!(uv & 0x20)) { n = 2; uv &= 0x1f; }
+    else if (!(uv & 0x10)) { n = 3; uv &= 0x0f; }
+    else if (!(uv & 0x08)) { n = 4; uv &= 0x07; }
+    else if (!(uv & 0x04)) { n = 5; uv &= 0x03; }
+    else if (!(uv & 0x02)) { n = 6; uv &= 0x01; }
+    else {
+	*lenp = 1;
+	rb_raise(rb_eArgError, "malformed UTF-8 character");
+    }
+    if (n > *lenp) {
+	rb_raise(rb_eArgError, "malformed UTF-8 character (expected %ld bytes, given %ld bytes)",
+		 n, *lenp);
+    }
+    *lenp = n--;
+    if (n != 0) {
+	while (n--) {
+	    c = *p++ & 0xff;
+	    if ((c & 0xc0) != 0x80) {
+		*lenp -= n + 1;
+		rb_raise(rb_eArgError, "malformed UTF-8 character");
+	    }
+	    else {
+		c &= 0x3f;
+		uv = uv << 6 | c;
+	    }
+	}
+    }
+    n = *lenp - 1;
+    if (uv < utf8_limits[n]) {
+	rb_raise(rb_eArgError, "redundant UTF-8 sequence");
+    }
+    return uv;
+}
+
+void
+Init_pack(void)
+{
+    rb_define_method(rb_cArray, "pack", pack_pack, 1);
+    rb_define_method(rb_cString, "unpack", pack_unpack, 1);
+
+    id_associated = rb_make_internal_id();
+}