minix/lib/libarchive/archive_string.c

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2010-07-13 21:17:02 +02:00
/*-
* Copyright (c) 2003-2007 Tim Kientzle
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "archive_platform.h"
__FBSDID("$FreeBSD: head/lib/libarchive/archive_string.c 201095 2009-12-28 02:33:22Z kientzle $");
/*
* Basic resizable string support, to simplify manipulating arbitrary-sized
* strings while minimizing heap activity.
*/
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_WCHAR_H
#include <wchar.h>
#endif
#if defined(_WIN32) && !defined(__CYGWIN__)
#include <windows.h>
#endif
#include "archive_private.h"
#include "archive_string.h"
struct archive_string *
__archive_string_append(struct archive_string *as, const char *p, size_t s)
{
if (__archive_string_ensure(as, as->length + s + 1) == NULL)
__archive_errx(1, "Out of memory");
memcpy(as->s + as->length, p, s);
as->s[as->length + s] = 0;
as->length += s;
return (as);
}
void
__archive_string_copy(struct archive_string *dest, struct archive_string *src)
{
if (src->length == 0)
dest->length = 0;
else {
if (__archive_string_ensure(dest, src->length + 1) == NULL)
__archive_errx(1, "Out of memory");
memcpy(dest->s, src->s, src->length);
dest->length = src->length;
dest->s[dest->length] = 0;
}
}
void
__archive_string_concat(struct archive_string *dest, struct archive_string *src)
{
if (src->length > 0) {
if (__archive_string_ensure(dest, dest->length + src->length + 1) == NULL)
__archive_errx(1, "Out of memory");
memcpy(dest->s + dest->length, src->s, src->length);
dest->length += src->length;
dest->s[dest->length] = 0;
}
}
void
__archive_string_free(struct archive_string *as)
{
as->length = 0;
as->buffer_length = 0;
if (as->s != NULL) {
free(as->s);
as->s = NULL;
}
}
/* Returns NULL on any allocation failure. */
struct archive_string *
__archive_string_ensure(struct archive_string *as, size_t s)
{
/* If buffer is already big enough, don't reallocate. */
if (as->s && (s <= as->buffer_length))
return (as);
/*
* Growing the buffer at least exponentially ensures that
* append operations are always linear in the number of
* characters appended. Using a smaller growth rate for
* larger buffers reduces memory waste somewhat at the cost of
* a larger constant factor.
*/
if (as->buffer_length < 32)
/* Start with a minimum 32-character buffer. */
as->buffer_length = 32;
else if (as->buffer_length < 8192)
/* Buffers under 8k are doubled for speed. */
as->buffer_length += as->buffer_length;
else {
/* Buffers 8k and over grow by at least 25% each time. */
size_t old_length = as->buffer_length;
as->buffer_length += as->buffer_length / 4;
/* Be safe: If size wraps, release buffer and return NULL. */
if (as->buffer_length < old_length) {
free(as->s);
as->s = NULL;
return (NULL);
}
}
/*
* The computation above is a lower limit to how much we'll
* grow the buffer. In any case, we have to grow it enough to
* hold the request.
*/
if (as->buffer_length < s)
as->buffer_length = s;
/* Now we can reallocate the buffer. */
as->s = (char *)realloc(as->s, as->buffer_length);
if (as->s == NULL)
return (NULL);
return (as);
}
struct archive_string *
__archive_strncat(struct archive_string *as, const void *_p, size_t n)
{
size_t s;
const char *p, *pp;
p = (const char *)_p;
/* Like strlen(p), except won't examine positions beyond p[n]. */
s = 0;
pp = p;
while (*pp && s < n) {
pp++;
s++;
}
return (__archive_string_append(as, p, s));
}
struct archive_string *
__archive_strappend_char(struct archive_string *as, char c)
{
return (__archive_string_append(as, &c, 1));
}
/*
* Translates a wide character string into UTF-8 and appends
* to the archive_string. Note: returns NULL if conversion fails,
* but still leaves a best-effort conversion in the argument as.
*/
struct archive_string *
__archive_strappend_w_utf8(struct archive_string *as, const wchar_t *w)
{
char *p;
unsigned wc;
char buff[256];
struct archive_string *return_val = as;
/*
* Convert one wide char at a time into 'buff', whenever that
* fills, append it to the string.
*/
p = buff;
while (*w != L'\0') {
/* Flush the buffer when we have <=16 bytes free. */
/* (No encoding has a single character >16 bytes.) */
if ((size_t)(p - buff) >= (size_t)(sizeof(buff) - 16)) {
*p = '\0';
archive_strcat(as, buff);
p = buff;
}
wc = *w++;
/* If this is a surrogate pair, assemble the full code point.*/
/* Note: wc must not be wchar_t here, because the full code
* point can be more than 16 bits! */
if (wc >= 0xD800 && wc <= 0xDBff
&& *w >= 0xDC00 && *w <= 0xDFFF) {
wc -= 0xD800;
wc *= 0x400;
wc += (*w - 0xDC00);
wc += 0x10000;
++w;
}
/* Translate code point to UTF8 */
if (wc <= 0x7f) {
*p++ = (char)wc;
} else if (wc <= 0x7ff) {
*p++ = 0xc0 | ((wc >> 6) & 0x1f);
*p++ = 0x80 | (wc & 0x3f);
} else if (wc <= 0xffff) {
*p++ = 0xe0 | ((wc >> 12) & 0x0f);
*p++ = 0x80 | ((wc >> 6) & 0x3f);
*p++ = 0x80 | (wc & 0x3f);
} else if (wc <= 0x1fffff) {
*p++ = 0xf0 | ((wc >> 18) & 0x07);
*p++ = 0x80 | ((wc >> 12) & 0x3f);
*p++ = 0x80 | ((wc >> 6) & 0x3f);
*p++ = 0x80 | (wc & 0x3f);
} else {
/* Unicode has no codes larger than 0x1fffff. */
/* TODO: use \uXXXX escape here instead of ? */
*p++ = '?';
return_val = NULL;
}
}
*p = '\0';
archive_strcat(as, buff);
return (return_val);
}
static int
utf8_to_unicode(int *pwc, const char *s, size_t n)
{
int ch;
/*
* Decode 1-4 bytes depending on the value of the first byte.
*/
ch = (unsigned char)*s;
if (ch == 0) {
return (0); /* Standard: return 0 for end-of-string. */
}
if ((ch & 0x80) == 0) {
*pwc = ch & 0x7f;
return (1);
}
if ((ch & 0xe0) == 0xc0) {
if (n < 2)
return (-1);
if ((s[1] & 0xc0) != 0x80) return (-1);
*pwc = ((ch & 0x1f) << 6) | (s[1] & 0x3f);
return (2);
}
if ((ch & 0xf0) == 0xe0) {
if (n < 3)
return (-1);
if ((s[1] & 0xc0) != 0x80) return (-1);
if ((s[2] & 0xc0) != 0x80) return (-1);
*pwc = ((ch & 0x0f) << 12)
| ((s[1] & 0x3f) << 6)
| (s[2] & 0x3f);
return (3);
}
if ((ch & 0xf8) == 0xf0) {
if (n < 4)
return (-1);
if ((s[1] & 0xc0) != 0x80) return (-1);
if ((s[2] & 0xc0) != 0x80) return (-1);
if ((s[3] & 0xc0) != 0x80) return (-1);
*pwc = ((ch & 0x07) << 18)
| ((s[1] & 0x3f) << 12)
| ((s[2] & 0x3f) << 6)
| (s[3] & 0x3f);
return (4);
}
/* Invalid first byte. */
return (-1);
}
/*
* Return a wide-character Unicode string by converting this archive_string
* from UTF-8. We assume that systems with 16-bit wchar_t always use
* UTF16 and systems with 32-bit wchar_t can accept UCS4.
*/
wchar_t *
__archive_string_utf8_w(struct archive_string *as)
{
wchar_t *ws, *dest;
int wc, wc2;/* Must be large enough for a 21-bit Unicode code point. */
const char *src;
int n;
size_t size;
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/* be pessimistic; UCS4 always takes up four bytes per char while
* UTF-16 may takes four bytes per char (except the 0 terminator)
*/
size = as->length * 4 + sizeof(wchar_t);
ws = (wchar_t *)malloc(size);
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if (ws == NULL)
__archive_errx(1, "Out of memory");
dest = ws;
src = as->s;
while (*src != '\0') {
n = utf8_to_unicode(&wc, src, 8);
if (n == 0)
break;
if (n < 0) {
free(ws);
return (NULL);
}
src += n;
if (wc >= 0xDC00 && wc <= 0xDBFF) {
/* This is a leading surrogate; some idiot
* has translated UTF16 to UTF8 without combining
* surrogates; rebuild the full code point before
* continuing. */
n = utf8_to_unicode(&wc2, src, 8);
if (n < 0) {
free(ws);
return (NULL);
}
if (n == 0) /* Ignore the leading surrogate */
break;
if (wc2 < 0xDC00 || wc2 > 0xDFFF) {
/* If the second character isn't a
* trailing surrogate, then someone
* has really screwed up and this is
* invalid. */
free(ws);
return (NULL);
} else {
src += n;
wc -= 0xD800;
wc *= 0x400;
wc += wc2 - 0xDC00;
wc += 0x10000;
}
}
if ((sizeof(wchar_t) < 4) && (wc > 0xffff)) {
/* We have a code point that won't fit into a
* wchar_t; convert it to a surrogate pair. */
wc -= 0x10000;
*dest++ = ((wc >> 10) & 0x3ff) + 0xD800;
*dest++ = (wc & 0x3ff) + 0xDC00;
} else
*dest++ = wc;
}
*dest = L'\0';
return (ws);
}
#if defined(_WIN32) && !defined(__CYGWIN__)
/*
* Translates a wide character string into current locale character set
* and appends to the archive_string. Note: returns NULL if conversion
* fails.
*
* Win32 builds use WideCharToMultiByte from the Windows API.
* (Maybe Cygwin should too? WideCharToMultiByte will know a
* lot more about local character encodings than the wcrtomb()
* wrapper is going to know.)
*/
struct archive_string *
__archive_strappend_w_mbs(struct archive_string *as, const wchar_t *w)
{
char *p;
int l, wl;
BOOL useDefaultChar = FALSE;
wl = (int)wcslen(w);
l = wl * 4 + 4;
p = malloc(l);
if (p == NULL)
__archive_errx(1, "Out of memory");
/* To check a useDefaultChar is to simulate error handling of
* the my_wcstombs() which is running on non Windows system with
* wctomb().
* And to set NULL for last argument is necessary when a codepage
* is not CP_ACP(current locale).
*/
l = WideCharToMultiByte(CP_ACP, 0, w, wl, p, l, NULL, &useDefaultChar);
if (l == 0) {
free(p);
return (NULL);
}
__archive_string_append(as, p, l);
free(p);
return (as);
}
#else
/*
* Translates a wide character string into current locale character set
* and appends to the archive_string. Note: returns NULL if conversion
* fails.
*
* Non-Windows uses ISO C wcrtomb() or wctomb() to perform the conversion
* one character at a time. If a non-Windows platform doesn't have
* either of these, fall back to the built-in UTF8 conversion.
*/
struct archive_string *
__archive_strappend_w_mbs(struct archive_string *as, const wchar_t *w)
{
#if !defined(HAVE_WCTOMB) && !defined(HAVE_WCRTOMB)
/* If there's no built-in locale support, fall back to UTF8 always. */
return __archive_strappend_w_utf8(as, w);
#else
/* We cannot use the standard wcstombs() here because it
* cannot tell us how big the output buffer should be. So
* I've built a loop around wcrtomb() or wctomb() that
* converts a character at a time and resizes the string as
* needed. We prefer wcrtomb() when it's available because
* it's thread-safe. */
int n;
char *p;
char buff[256];
#if HAVE_WCRTOMB
mbstate_t shift_state;
memset(&shift_state, 0, sizeof(shift_state));
#else
/* Clear the shift state before starting. */
wctomb(NULL, L'\0');
#endif
/*
* Convert one wide char at a time into 'buff', whenever that
* fills, append it to the string.
*/
p = buff;
while (*w != L'\0') {
/* Flush the buffer when we have <=16 bytes free. */
/* (No encoding has a single character >16 bytes.) */
if ((size_t)(p - buff) >= (size_t)(sizeof(buff) - MB_CUR_MAX)) {
*p = '\0';
archive_strcat(as, buff);
p = buff;
}
#if HAVE_WCRTOMB
n = wcrtomb(p, *w++, &shift_state);
#else
n = wctomb(p, *w++);
#endif
if (n == -1)
return (NULL);
p += n;
}
*p = '\0';
archive_strcat(as, buff);
return (as);
#endif
}
#endif /* _WIN32 && ! __CYGWIN__ */