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pack.c
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pack.c
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/**********************************************************************
pack.c -
$Author$
$Date$
created at: Thu Feb 10 15:17:05 JST 1994
Copyright (C) 1993-2003 Yukihiro Matsumoto
**********************************************************************/
#include "ruby.h"
#include <sys/types.h>
#include <ctype.h>
#define SIZE16 2
#define SIZE32 4
#if SIZEOF_SHORT != 2 || SIZEOF_LONG != 4
# define NATINT_PACK
#endif
#ifdef NATINT_PACK
# define OFF16B(p) ((char*)(p) + (natint?0:(sizeof(short) - SIZE16)))
# define OFF32B(p) ((char*)(p) + (natint?0:(sizeof(long) - SIZE32)))
# define NATINT_LEN(type,len) (natint?sizeof(type):(len))
# ifdef WORDS_BIGENDIAN
# define OFF16(p) OFF16B(p)
# define OFF32(p) OFF32B(p)
# endif
# define NATINT_HTOVS(x) (natint?htovs(x):htov16(x))
# define NATINT_HTOVL(x) (natint?htovl(x):htov32(x))
# define NATINT_HTONS(x) (natint?htons(x):hton16(x))
# define NATINT_HTONL(x) (natint?htonl(x):hton32(x))
#else
# define NATINT_LEN(type,len) sizeof(type)
# define NATINT_HTOVS(x) htovs(x)
# define NATINT_HTOVL(x) htovl(x)
# define NATINT_HTONS(x) htons(x)
# define NATINT_HTONL(x) htonl(x)
#endif
#ifndef OFF16
# define OFF16(p) (char*)(p)
# define OFF32(p) (char*)(p)
#endif
#ifndef OFF16B
# define OFF16B(p) (char*)(p)
# define OFF32B(p) (char*)(p)
#endif
#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 = malloc(sizeof(xtype)); \
*zp = z; \
s = (unsigned char*)zp; \
t = 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; \
}
#ifndef swap16
#define swap16(x) ((((x)&0xFF)<<8) | (((x)>>8)&0xFF))
#endif
#if SIZEOF_SHORT == 2
#define swaps(x) swap16(x)
#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
#ifndef swap32
#define swap32(x) ((((x)&0xFF)<<24) \
|(((x)>>24)&0xFF) \
|(((x)&0x0000FF00)<<8) \
|(((x)&0x00FF0000)>>8) )
#endif
#if SIZEOF_LONG == 4
#define swapl(x) swap32(x)
#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))
# ifdef NATINT_PACK
#define htov16(x) (endian()?swap16(x):(x))
#define htov32(x) (endian()?swap32(x):(x))
#define hton16(x) (endian()?(x):swap16(x))
#define hton32(x) (endian()?(x):swap32(x))
# endif
#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)
# ifdef NATINT_PACK
#define htov16(x) swap16(x)
#define htov32(x) swap32(x)
#define hton16(x) (x)
#define hton32(x) (x)
# endif
#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)
# ifdef NATINT_PACK
#define htov16(x) (x)
#define htov32(x) (x)
#define hton16(x) swap16(x)
#define hton32(x) swap32(x)
# endif
#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
unsigned long rb_big2ulong_pack _((VALUE x));
static unsigned long
num2i32(x)
VALUE x;
{
x = rb_to_int(x); /* is nil OK? (should not) */
if (FIXNUM_P(x)) return FIX2LONG(x);
if (TYPE(x) == T_BIGNUM) {
return rb_big2ulong_pack(x);
}
rb_raise(rb_eTypeError, "cannot conver %s to `integer'", rb_obj_classname(x));
return 0; /* not reached */
}
#if SIZEOF_LONG == SIZE32 || SIZEOF_INT == SIZE32
# define EXTEND32(x)
#else
/* invariant in modulo 1<<31 */
# define EXTEND32(x) do {if (!natint) {(x) = (I32)(((1<<31)-1-(x))^~(~0<<31))}} while(0)
#endif
#if SIZEOF_SHORT == SIZE16
# define EXTEND16(x)
#else
# define EXTEND16(x) do { if (!natint) {(x) = (short)(((1<<15)-1-(x))^~(~0<<15))}} while(0)
#endif
#ifdef HAVE_LONG_LONG
# define QUAD_SIZE sizeof(LONG_LONG)
#else
# define QUAD_SIZE 8
#endif
static char *toofew = "too few arguments";
static void encodes _((VALUE,char*,long,int));
static void qpencode _((VALUE,VALUE,long));
static int uv_to_utf8 _((char*,unsigned long));
static unsigned long utf8_to_uv _((char*,long*));
/*
* 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>'') 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+.
*
* Directive Meaning
* ---------------------------------------------------------------
* @ | Moves to absolute position
* A | ASCII string (space padded, count is width)
* a | ASCII string (null padded, count is width)
* B | Bit string (descending bit order)
* b | Bit string (ascending bit order)
* C | Unsigned char
* c | Char
* D, d | Double-precision float, native format
* E | Double-precision float, little-endian byte order
* e | Single-precision float, little-endian byte order
* F, f | Single-precision float, native format
* G | Double-precision float, network (big-endian) byte order
* g | Single-precision float, network (big-endian) byte order
* H | Hex string (high nibble first)
* h | Hex string (low nibble first)
* I | Unsigned integer
* i | Integer
* L | Unsigned long
* l | Long
* M | Quoted printable, MIME encoding (see RFC2045)
* m | Base64 encoded string
* N | Long, network (big-endian) byte order
* n | Short, network (big-endian) byte-order
* P | Pointer to a structure (fixed-length string)
* p | Pointer to a null-terminated string
* Q, q | 64-bit number
* S | Unsigned short
* s | Short
* U | UTF-8
* u | UU-encoded string
* V | Long, little-endian byte order
* v | Short, little-endian byte order
* w | BER-compressed integer\fnm
* X | Back up a byte
* x | Null byte
* Z | Same as ``A''
*/
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, associates = 0;
char type;
long items, len, idx, plen;
char *ptr;
#ifdef NATINT_PACK
int natint; /* native integer */
#endif
StringValue(fmt);
p = RSTRING(fmt)->ptr;
pend = p + RSTRING(fmt)->len;
res = rb_str_buf_new(0);
items = RARRAY(ary)->len;
idx = 0;
#define THISFROM RARRAY(ary)->ptr[idx]
#define NEXTFROM (items-- > 0 ? RARRAY(ary)->ptr[idx++] : (rb_raise(rb_eArgError, toofew),0))
while (p < pend) {
type = *p++; /* get data type */
#ifdef NATINT_PACK
natint = 0;
#endif
if (ISSPACE(type)) continue;
if (type == '#') {
while ((p < pend) && (*p != '\n')) {
p++;
}
continue;
}
if (*p == '_' || *p == '!') {
const char *natstr = "sSiIlL";
if (strchr(natstr, type)) {
#ifdef NATINT_PACK
natint = 1;
#endif
p++;
}
else {
rb_raise(rb_eArgError, "'%c' allowed only after types %s", *p, natstr);
}
}
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 'Z':
case 'B': case 'b':
case 'H': case 'h':
from = NEXTFROM;
if (NIL_P(from)) {
ptr = "";
plen = 0;
}
else {
StringValue(from);
ptr = RSTRING(from)->ptr;
plen = RSTRING(from)->len;
OBJ_INFECT(res, from);
}
if (p[-1] == '*')
len = plen;
switch (type) {
case 'a': /* arbitrary binary string (null padded) */
case 'A': /* ASCII string (space padded) */
case 'Z': /* null terminated ASCII string */
if (plen >= len)
rb_str_buf_cat(res, ptr, len);
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;
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 = byte & 0xff;
rb_str_buf_cat(res, &c, 1);
byte = 0;
}
}
if (len & 7) {
char c;
byte >>= 7 - (len & 7);
c = byte & 0xff;
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 = byte & 0xff;
rb_str_buf_cat(res, &c, 1);
byte = 0;
}
}
if (len & 7) {
char c;
byte <<= 7 - (len & 7);
c = byte & 0xff;
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 - 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 = byte & 0xff;
rb_str_buf_cat(res, &c, 1);
byte = 0;
}
}
if (len & 1) {
char c = byte & 0xff;
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 - 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 = byte & 0xff;
rb_str_buf_cat(res, &c, 1);
byte = 0;
}
}
if (len & 1) {
char c = byte & 0xff;
rb_str_buf_cat(res, &c, 1);
}
len = j;
goto grow;
}
break;
}
break;
case 'c': /* signed char */
case 'C': /* unsigned char */
while (len-- > 0) {
char c;
from = NEXTFROM;
c = num2i32(from);
rb_str_buf_cat(res, &c, sizeof(char));
}
break;
case 's': /* signed short */
case 'S': /* unsigned short */
while (len-- > 0) {
short s;
from = NEXTFROM;
s = num2i32(from);
rb_str_buf_cat(res, OFF16(&s), NATINT_LEN(short,2));
}
break;
case 'i': /* signed int */
case 'I': /* unsigned int */
while (len-- > 0) {
long i;
from = NEXTFROM;
i = num2i32(from);
rb_str_buf_cat(res, OFF32(&i), NATINT_LEN(int,4));
}
break;
case 'l': /* signed long */
case 'L': /* unsigned long */
while (len-- > 0) {
long l;
from = NEXTFROM;
l = num2i32(from);
rb_str_buf_cat(res, OFF32(&l), NATINT_LEN(long,4));
}
break;
case 'q': /* signed quad (64bit) int */
case 'Q': /* unsigned quad (64bit) int */
while (len-- > 0) {
char tmp[QUAD_SIZE];
from = NEXTFROM;
rb_quad_pack(tmp, from);
rb_str_buf_cat(res, (char*)&tmp, QUAD_SIZE);
}
break;
case 'n': /* unsigned short (network byte-order) */
while (len-- > 0) {
unsigned short s;
from = NEXTFROM;
s = num2i32(from);
s = NATINT_HTONS(s);
rb_str_buf_cat(res, OFF16(&s), NATINT_LEN(short,2));
}
break;
case 'N': /* unsigned long (network byte-order) */
while (len-- > 0) {
unsigned long l;
from = NEXTFROM;
l = num2i32(from);
l = NATINT_HTONL(l);
rb_str_buf_cat(res, OFF32(&l), NATINT_LEN(long,4));
}
break;
case 'v': /* unsigned short (VAX byte-order) */
while (len-- > 0) {
unsigned short s;
from = NEXTFROM;
s = num2i32(from);
s = NATINT_HTOVS(s);
rb_str_buf_cat(res, OFF16(&s), NATINT_LEN(short,2));
}
break;
case 'V': /* unsigned long (VAX byte-order) */
while (len-- > 0) {
unsigned long l;
from = NEXTFROM;
l = num2i32(from);
l = NATINT_HTOVL(l);
rb_str_buf_cat(res, OFF32(&l), NATINT_LEN(long,4));
}
break;
case 'f': /* single precision float in native format */
case 'F': /* ditto */
while (len-- > 0) {
float f;
from = NEXTFROM;
f = RFLOAT(rb_Float(from))->value;
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 = RFLOAT(rb_Float(from))->value;
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(rb_Float(from))->value;
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(rb_Float(from))->value;
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 = RFLOAT(rb_Float(from))->value;
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(rb_Float(from))->value;
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(res)->len;
if (plen < len)
rb_raise(rb_eArgError, "X outside of string");
RSTRING(res)->len = plen - len;
RSTRING(res)->ptr[plen - len] = '\0';
break;
case '@': /* null fill to absolute position */
len -= RSTRING(res)->len;
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) {
long l;
char buf[8];
int le;
from = NEXTFROM;
l = num2i32(from);
le = 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(from)->ptr;
plen = RSTRING(from)->len;
if (len <= 2)
len = 45;
else
len = len / 3 * 3;
while (plen > 0) {
long todo;
if (plen > len)
todo = len;
else
todo = plen;
encodes(res, ptr, todo, type);
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(from)->len < len) {
rb_raise(rb_eArgError, "too short buffer for P(%ld for %ld)",
RSTRING(from)->len, 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);
}
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) {
unsigned long ul;
VALUE buf = rb_str_new(0, 0);
char c, *bufs, *bufe;
from = NEXTFROM;
if (TYPE(from) == T_BIGNUM) {
VALUE big128 = rb_uint2big(128);
while (TYPE(from) == T_BIGNUM) {
from = rb_big_divmod(from, big128);
c = NUM2INT(RARRAY(from)->ptr[1]) | 0x80; /* mod */
rb_str_buf_cat(buf, &c, sizeof(char));
from = RARRAY(from)->ptr[0]; /* div */
}
}
{
long l = NUM2LONG(from);
if (l < 0) {
rb_raise(rb_eArgError, "cannot compress negative numbers");
}
ul = l;
}
while (ul) {
c = ((ul & 0x7f) | 0x80);
rb_str_buf_cat(buf, &c, sizeof(char));
ul >>= 7;
}
if (RSTRING(buf)->len) {
bufs = RSTRING(buf)->ptr;
bufe = bufs + RSTRING(buf)->len - 1;
*bufs &= 0x7f; /* clear continue bit */
while (bufs < bufe) { /* reverse */
c = *bufs;
*bufs++ = *bufe;
*bufe-- = c;
}
rb_str_buf_cat(res, RSTRING(buf)->ptr, RSTRING(buf)->len);
}
else {
c = 0;
rb_str_buf_cat(res, &c, sizeof(char));
}
}
break;
default:
break;
}
}
if (associates) {
rb_str_associate(res, associates);
}
return res;
}
static char uu_table[] =
"`!\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_";
static char b64_table[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static void