forked from ruby/ruby
/
pack.c
2018 lines (1825 loc) · 52.5 KB
/
pack.c
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/**********************************************************************
pack.c -
$Author$
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");
}