fontconfig/src/fcstr.c

/*
 * $RCSId: xc/lib/fontconfig/src/fcstr.c,v 1.10 2002/08/31 22:17:32 keithp Exp $
 *
 * Copyright © 2000 Keith Packard
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of Keith Packard not be used in
 * advertising or publicity pertaining to distribution of the software without
 * specific, written prior permission.  Keith Packard makes no
 * representations about the suitability of this software for any purpose.  It
 * is provided "as is" without express or implied warranty.
 *
 * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <sys/mman.h>
#include "fcint.h"

FcChar8 *
FcStrCopy (const FcChar8 *s)
{
    FcChar8	*r;

    if (!s)
	return 0;
    r = (FcChar8 *) malloc (strlen ((char *) s) + 1);
    if (!r)
	return 0;
    FcMemAlloc (FC_MEM_STRING, strlen ((char *) s) + 1);
    strcpy ((char *) r, (char *) s);
    return r;
}

FcChar8 *
FcStrPlus (const FcChar8 *s1, const FcChar8 *s2)
{
    int	    l = strlen ((char *)s1) + strlen ((char *) s2) + 1;
    FcChar8 *s = malloc (l);

    if (!s)
	return 0;
    FcMemAlloc (FC_MEM_STRING, l);
    strcpy ((char *) s, (char *) s1);
    strcat ((char *) s, (char *) s2);
    return s;
}

void
FcStrFree (FcChar8 *s)
{
    FcMemFree (FC_MEM_STRING, strlen ((char *) s) + 1);
    free (s);
}


#include "../fc-case/fccase.h"

#define FcCaseFoldUpperCount(cf) \
    ((cf)->method == FC_CASE_FOLD_FULL ? 1 : (cf)->count)

#define FC_STR_CANON_BUF_LEN	1024

typedef struct _FcCaseWalker {
    const FcChar8   *read;
    const FcChar8   *src;
    int		    len;
    FcChar8	    utf8[FC_MAX_CASE_FOLD_CHARS + 1];
} FcCaseWalker;

static void
FcStrCaseWalkerInit (const FcChar8 *src, FcCaseWalker *w)
{
    w->src = src;
    w->read = 0;
    w->len = strlen (src);
}

static FcChar8
FcStrCaseWalkerLong (FcCaseWalker *w, FcChar8 r)
{
    FcChar32	ucs4;
    int		slen;

    slen = FcUtf8ToUcs4 (w->src - 1, &ucs4, w->len + 1);
    if (slen <= 0)
	return r;
    if (FC_MIN_FOLD_CHAR <= ucs4 && ucs4 <= FC_MAX_FOLD_CHAR)
    {
	int min = 0;
	int max = FC_NUM_CASE_FOLD;

	while (min <= max)
	{
	    int		mid = (min + max) >> 1;
	    FcChar32    low = fcCaseFold[mid].upper;
	    FcChar32    high = low + FcCaseFoldUpperCount (&fcCaseFold[mid]);
	    
	    if (high <= ucs4)
		min = mid + 1;
	    else if (ucs4 < low)
		max = mid - 1;
	    else
	    {
		const FcCaseFold    *fold = &fcCaseFold[mid];
		int		    dlen;
		
		switch (fold->method) {
		case  FC_CASE_FOLD_EVEN_ODD:
		    if ((ucs4 & 1) != (fold->upper & 1))
			return r;
		    /* fall through ... */
		default:
		    dlen = FcUcs4ToUtf8 (ucs4 + fold->offset, w->utf8);
		    break;
		case FC_CASE_FOLD_FULL:
		    dlen = fold->count;
		    memcpy (w->utf8, fcCaseFoldChars + fold->offset, dlen);
		    break;
		}
		
		/* consume rest of src utf-8 bytes */
		w->src += slen - 1;
		w->len -= slen - 1;
		
		/* read from temp buffer */
		w->utf8[dlen] = '\0';
		w->read = w->utf8;
		return *w->read++;
	    }
	}
    }
    return r;
}

static FcChar8
FcStrCaseWalkerNext (FcCaseWalker *w)
{
    FcChar8	r;

    if (w->read)
    {
	if ((r = *w->read++))
	    return r;
	w->read = 0;
    }
    r = *w->src++;
    --w->len;
    
    if ((r & 0xc0) == 0xc0)
	return FcStrCaseWalkerLong (w, r);
    if ('A' <= r && r <= 'Z')
        r = r - 'A' + 'a';
    return r;
}

static FcChar8
FcStrCaseWalkerNextIgnoreBlanks (FcCaseWalker *w)
{
    FcChar8	r;

    if (w->read)
    {
	if ((r = *w->read++))
	    return r;
	w->read = 0;
    }
    do
    {
	r = *w->src++;
	--w->len;
    } while (r == ' ');
    
    if ((r & 0xc0) == 0xc0)
	return FcStrCaseWalkerLong (w, r);
    if ('A' <= r && r <= 'Z')
        r = r - 'A' + 'a';
    return r;
}

FcChar8 *
FcStrDowncase (const FcChar8 *s)
{
    FcCaseWalker    w;
    int		    len = 0;
    FcChar8	    *dst, *d;

    FcStrCaseWalkerInit (s, &w);
    while (FcStrCaseWalkerNext (&w))
	len++;
    d = dst = malloc (len + 1);
    if (!d)
	return 0;
    FcMemAlloc (FC_MEM_STRING, len + 1);
    FcStrCaseWalkerInit (s, &w);
    while ((*d++ = FcStrCaseWalkerNext (&w)));
    return dst;
}

int
FcStrCmpIgnoreCase (const FcChar8 *s1, const FcChar8 *s2)
{
    FcCaseWalker    w1, w2;
    FcChar8	    c1, c2;

    if (s1 == s2) return 0;
    
    FcStrCaseWalkerInit (s1, &w1);
    FcStrCaseWalkerInit (s2, &w2);
    
    for (;;) 
    {
	c1 = FcStrCaseWalkerNext (&w1);
	c2 = FcStrCaseWalkerNext (&w2);
	if (!c1 || (c1 != c2))
	    break;
    }
    return (int) c1 - (int) c2;
}

int
FcStrCmpIgnoreBlanksAndCase (const FcChar8 *s1, const FcChar8 *s2)
{
    FcCaseWalker    w1, w2;
    FcChar8	    c1, c2;

    if (s1 == s2) return 0;
    
    FcStrCaseWalkerInit (s1, &w1);
    FcStrCaseWalkerInit (s2, &w2);
    
    for (;;) 
    {
	c1 = FcStrCaseWalkerNextIgnoreBlanks (&w1);
	c2 = FcStrCaseWalkerNextIgnoreBlanks (&w2);
	if (!c1 || (c1 != c2))
	    break;
    }
    return (int) c1 - (int) c2;
}

int
FcStrCmp (const FcChar8 *s1, const FcChar8 *s2)
{
    FcChar8 c1, c2;
    
    if (s1 == s2)
	return 0;
    for (;;) 
    {
	c1 = *s1++;
	c2 = *s2++;
	if (!c1 || c1 != c2)
	    break;
    }
    return (int) c1 - (int) c2;
}

/*
 * Return a hash value for a string
 */

FcChar32
FcStrHashIgnoreCase (const FcChar8 *s)
{
    FcChar32	    h = 0;
    FcCaseWalker    w;
    FcChar8	    c;

    FcStrCaseWalkerInit (s, &w);
    while ((c = FcStrCaseWalkerNext (&w)))
	h = ((h << 3) ^ (h >> 3)) ^ c;
    return h;
}

/*
 * Is the head of s1 equal to s2?
 */

static FcBool
FcStrIsAtIgnoreBlanksAndCase (const FcChar8 *s1, const FcChar8 *s2)
{
    FcCaseWalker    w1, w2;
    FcChar8	    c1, c2;

    FcStrCaseWalkerInit (s1, &w1);
    FcStrCaseWalkerInit (s2, &w2);
    
    for (;;) 
    {
	c1 = FcStrCaseWalkerNextIgnoreBlanks (&w1);
	c2 = FcStrCaseWalkerNextIgnoreBlanks (&w2);
	if (!c1 || (c1 != c2))
	    break;
    }
    return c1 == c2 || !c2;
}

/*
 * Does s1 contain an instance of s2 (ignoring blanks and case)?
 */

const FcChar8 *
FcStrContainsIgnoreBlanksAndCase (const FcChar8 *s1, const FcChar8 *s2)
{
    while (*s1)
    {
	if (FcStrIsAtIgnoreBlanksAndCase (s1, s2))
	    return s1;
	s1++;
    }
    return 0;
}

/*
 * Is the head of s1 equal to s2?
 */

static FcBool
FcStrIsAtIgnoreCase (const FcChar8 *s1, const FcChar8 *s2)
{
    FcCaseWalker    w1, w2;
    FcChar8	    c1, c2;

    FcStrCaseWalkerInit (s1, &w1);
    FcStrCaseWalkerInit (s2, &w2);
    
    for (;;) 
    {
	c1 = FcStrCaseWalkerNext (&w1);
	c2 = FcStrCaseWalkerNext (&w2);
	if (!c1 || (c1 != c2))
	    break;
    }
    return c1 == c2 || !c2;
}

/*
 * Does s1 contain an instance of s2 (ignoring blanks and case)?
 */

const FcChar8 *
FcStrContainsIgnoreCase (const FcChar8 *s1, const FcChar8 *s2)
{
    while (*s1)
    {
	if (FcStrIsAtIgnoreCase (s1, s2))
	    return s1;
	s1++;
    }
    return 0;
}

const FcChar8 *
FcStrStrIgnoreCase (const FcChar8 *s1, const FcChar8 *s2)
{
    FcCaseWalker    w1, w2;
    FcChar8	    c1, c2;
    const FcChar8   *cur;

    if (!s1 || !s2)
	return 0;

    if (s1 == s2)
	return s1;
    
    FcStrCaseWalkerInit (s1, &w1);
    FcStrCaseWalkerInit (s2, &w2);
    
    c2 = FcStrCaseWalkerNext (&w2);
    
    for (;;)
    {
	cur = w1.src;
	c1 = FcStrCaseWalkerNext (&w1);
	if (!c1)
	    break;
	if (c1 == c2)
	{
	    FcCaseWalker    w1t = w1;
	    FcCaseWalker    w2t = w2;
	    FcChar8	    c1t, c2t;

	    for (;;)
	    {
		c1t = FcStrCaseWalkerNext (&w1t);
		c2t = FcStrCaseWalkerNext (&w2t);

		if (!c2t)
		    return cur;
		if (c2t != c1t)
		    break;
	    }
	}
    }
    return 0;
}

const FcChar8 *
FcStrStr (const FcChar8 *s1, const FcChar8 *s2)
{
    FcChar8 c1, c2;
    const FcChar8 * p = s1;
    const FcChar8 * b = s2;

    if (!s1 || !s2)
	return 0;

    if (s1 == s2)
	return s1;

again:
    c2 = *s2++;

    if (!c2)
	return 0;

    for (;;) 
    {
	p = s1;
	c1 = *s1++;
	if (!c1 || c1 == c2)
	    break;
    }

    if (c1 != c2)
	return 0;

    for (;;)
    {
	c1 = *s1;
	c2 = *s2;
	if (c1 && c2 && c1 != c2)
	{
	    s1 = p + 1;
	    s2 = b;
	    goto again;
	}
	if (!c2)
	    return p;
	if (!c1)
	    return 0;
	++ s1;
	++ s2;
    }

    return 0;
}

int
FcUtf8ToUcs4 (const FcChar8 *src_orig,
	      FcChar32	    *dst,
	      int	    len)
{
    const FcChar8   *src = src_orig;
    FcChar8	    s;
    int		    extra;
    FcChar32	    result;

    if (len == 0)
	return 0;
    
    s = *src++;
    len--;
    
    if (!(s & 0x80))
    {
	result = s;
	extra = 0;
    } 
    else if (!(s & 0x40))
    {
	return -1;
    }
    else if (!(s & 0x20))
    {
	result = s & 0x1f;
	extra = 1;
    }
    else if (!(s & 0x10))
    {
	result = s & 0xf;
	extra = 2;
    }
    else if (!(s & 0x08))
    {
	result = s & 0x07;
	extra = 3;
    }
    else if (!(s & 0x04))
    {
	result = s & 0x03;
	extra = 4;
    }
    else if ( ! (s & 0x02))
    {
	result = s & 0x01;
	extra = 5;
    }
    else
    {
	return -1;
    }
    if (extra > len)
	return -1;
    
    while (extra--)
    {
	result <<= 6;
	s = *src++;
	
	if ((s & 0xc0) != 0x80)
	    return -1;
	
	result |= s & 0x3f;
    }
    *dst = result;
    return src - src_orig;
}

FcBool
FcUtf8Len (const FcChar8    *string,
	   int		    len,
	   int		    *nchar,
	   int		    *wchar)
{
    int		n;
    int		clen;
    FcChar32	c;
    FcChar32	max;
    
    n = 0;
    max = 0;
    while (len)
    {
	clen = FcUtf8ToUcs4 (string, &c, len);
	if (clen <= 0)	/* malformed UTF8 string */
	    return FcFalse;
	if (c > max)
	    max = c;
	string += clen;
	len -= clen;
	n++;
    }
    *nchar = n;
    if (max >= 0x10000)
	*wchar = 4;
    else if (max > 0x100)
	*wchar = 2;
    else
	*wchar = 1;
    return FcTrue;
}

int
FcUcs4ToUtf8 (FcChar32	ucs4,
	      FcChar8	dest[FC_UTF8_MAX_LEN])
{
    int	bits;
    FcChar8 *d = dest;
    
    if      (ucs4 <       0x80) {  *d++=  ucs4;                         bits= -6; }
    else if (ucs4 <      0x800) {  *d++= ((ucs4 >>  6) & 0x1F) | 0xC0;  bits=  0; }
    else if (ucs4 <    0x10000) {  *d++= ((ucs4 >> 12) & 0x0F) | 0xE0;  bits=  6; }
    else if (ucs4 <   0x200000) {  *d++= ((ucs4 >> 18) & 0x07) | 0xF0;  bits= 12; }
    else if (ucs4 <  0x4000000) {  *d++= ((ucs4 >> 24) & 0x03) | 0xF8;  bits= 18; }
    else if (ucs4 < 0x80000000) {  *d++= ((ucs4 >> 30) & 0x01) | 0xFC;  bits= 24; }
    else return 0;

    for ( ; bits >= 0; bits-= 6) {
	*d++= ((ucs4 >> bits) & 0x3F) | 0x80;
    }
    return d - dest;
}

#define GetUtf16(src,endian) \
    ((FcChar16) ((src)[endian == FcEndianBig ? 0 : 1] << 8) | \
     (FcChar16) ((src)[endian == FcEndianBig ? 1 : 0]))

int
FcUtf16ToUcs4 (const FcChar8	*src_orig,
	       FcEndian		endian,
	       FcChar32		*dst,
	       int		len)	/* in bytes */
{
    const FcChar8   *src = src_orig;
    FcChar16	    a, b;
    FcChar32	    result;

    if (len < 2)
	return 0;
    
    a = GetUtf16 (src, endian); src += 2; len -= 2;
    
    /* 
     * Check for surrogate 
     */
    if ((a & 0xfc00) == 0xd800)
    {
	if (len < 2)
	    return 0;
	b = GetUtf16 (src, endian); src += 2; len -= 2;
	/*
	 * Check for invalid surrogate sequence
	 */
	if ((b & 0xfc00) != 0xdc00)
	    return 0;
	result = ((((FcChar32) a & 0x3ff) << 10) |
		  ((FcChar32) b & 0x3ff)) + 0x10000;
    }
    else
	result = a;
    *dst = result;
    return src - src_orig;
}

FcBool
FcUtf16Len (const FcChar8   *string,
	    FcEndian	    endian,
	    int		    len,	/* in bytes */
	    int		    *nchar,
	    int		    *wchar)
{
    int		n;
    int		clen;
    FcChar32	c;
    FcChar32	max;
    
    n = 0;
    max = 0;
    while (len)
    {
	clen = FcUtf16ToUcs4 (string, endian, &c, len);
	if (clen <= 0)	/* malformed UTF8 string */
	    return FcFalse;
	if (c > max)
	    max = c;
	string += clen;
	len -= clen;
	n++;
    }
    *nchar = n;
    if (max >= 0x10000)
	*wchar = 4;
    else if (max > 0x100)
	*wchar = 2;
    else
	*wchar = 1;
    return FcTrue;
}

void
FcStrBufInit (FcStrBuf *buf, FcChar8 *init, int size)
{
    buf->buf = init;
    buf->allocated = FcFalse;
    buf->failed = FcFalse;
    buf->len = 0;
    buf->size = size;
}

void
FcStrBufDestroy (FcStrBuf *buf)
{
    if (buf->allocated)
    {
	FcMemFree (FC_MEM_STRBUF, buf->size);
	free (buf->buf);
	FcStrBufInit (buf, 0, 0);
    }
}

FcChar8 *
FcStrBufDone (FcStrBuf *buf)
{
    FcChar8 *ret;

    ret = malloc (buf->len + 1);
    if (ret)
    {
	FcMemAlloc (FC_MEM_STRING, buf->len + 1);
	memcpy (ret, buf->buf, buf->len);
	ret[buf->len] = '\0';
    }
    FcStrBufDestroy (buf);
    return ret;
}

FcBool
FcStrBufChar (FcStrBuf *buf, FcChar8 c)
{
    if (buf->len == buf->size)
    {
	FcChar8	    *new;
	int	    size;

	if (buf->allocated)
	{
	    size = buf->size * 2;
	    new = realloc (buf->buf, size);
	}
	else
	{
	    size = buf->size + 1024;
	    new = malloc (size);
	    if (new)
	    {
		buf->allocated = FcTrue;
		memcpy (new, buf->buf, buf->len);
	    }
	}
	if (!new)
	{
	    buf->failed = FcTrue;
	    return FcFalse;
	}
	if (buf->size)
	    FcMemFree (FC_MEM_STRBUF, buf->size);
	FcMemAlloc (FC_MEM_STRBUF, size);
	buf->size = size;
	buf->buf = new;
    }
    buf->buf[buf->len++] = c;
    return FcTrue;
}

FcBool
FcStrBufString (FcStrBuf *buf, const FcChar8 *s)
{
    FcChar8 c;
    while ((c = *s++))
	if (!FcStrBufChar (buf, c))
	    return FcFalse;
    return FcTrue;
}

FcBool
FcStrBufData (FcStrBuf *buf, const FcChar8 *s, int len)
{
    while (len-- > 0)
	if (!FcStrBufChar (buf, *s++))
	    return FcFalse;
    return FcTrue;
}

FcBool
FcStrUsesHome (const FcChar8 *s)
{
    return *s == '~';
}

FcChar8 *
FcStrCopyFilename (const FcChar8 *s)
{
    FcChar8 *new;
    
    if (*s == '~')
    {
	FcChar8	*home = FcConfigHome ();
	int	size;
	if (!home)
	    return 0;
	size = strlen ((char *) home) + strlen ((char *) s);
	new = (FcChar8 *) malloc (size);
	if (!new)
	    return 0;
	FcMemAlloc (FC_MEM_STRING, size);
	strcpy ((char *) new, (char *) home);
	strcat ((char *) new, (char *) s + 1);
    }
    else
    {
	int	size = strlen ((char *) s) + 1;
	new = (FcChar8 *) malloc (size);
	if (!new)
	    return 0;
	FcMemAlloc (FC_MEM_STRING, size);
	strcpy ((char *) new, (const char *) s);
    }
    return new;
}

FcChar8 *
FcStrLastSlash (const FcChar8  *path)
{
    FcChar8	    *slash;

    slash = (FcChar8 *) strrchr ((const char *) path, '/');
#ifdef _WIN32
    {
        FcChar8     *backslash;

	backslash = (FcChar8 *) strrchr ((const char *) path, '\\');
	if (!slash || (backslash && backslash > slash))
	    slash = backslash;
    }
#endif

    return slash;
}
  
FcChar8 *
FcStrDirname (const FcChar8 *file)
{
    FcChar8 *slash;
    FcChar8 *dir;

    slash = FcStrLastSlash (file);
    if (!slash)
	return FcStrCopy ((FcChar8 *) ".");
    dir = malloc ((slash - file) + 1);
    if (!dir)
	return 0;
    FcMemAlloc (FC_MEM_STRING, (slash - file) + 1);
    strncpy ((char *) dir, (const char *) file, slash - file);
    dir[slash - file] = '\0';
    return dir;
}

FcChar8 *
FcStrBasename (const FcChar8 *file)
{
    FcChar8 *slash;

    slash = FcStrLastSlash (file);
    if (!slash)
	return FcStrCopy (file);
    return FcStrCopy (slash + 1);
}

FcStrSet *
FcStrSetCreate (void)
{
    FcStrSet	*set = malloc (sizeof (FcStrSet));
    if (!set)
	return 0;
    FcMemAlloc (FC_MEM_STRSET, sizeof (FcStrSet));
    set->ref = 1;
    set->num = 0;
    set->size = 0;
    set->storage = FcStorageDynamic;
    set->u.strs = 0;
    return set;
}

static FcChar8 * strset_buf = 0; 
static int strset_buf_ptr = 0, strset_buf_count = 0;
static int * strset_idx = 0; 
static int strset_idx_ptr = 0, strset_idx_count = 0;
static FcStrSet * strsets = 0; 
static int strset_ptr = 0, strset_count = 0;

void FcStrSetClearStatic()
{
    strset_buf = 0; strset_buf_ptr = 0; strset_buf_count = 0;
    strset_idx = 0; strset_idx_ptr = 0; strset_idx_count = 0;
    strsets = 0; strset_ptr = 0; strset_count = 0;
}

FcChar8 *
FcStrSetGet (const FcStrSet *set, int i)
{
    int index;
    switch (set->storage)
    {
    case FcStorageStatic:
	index = strset_idx[set->u.stridx_offset];
	if (index == -1)
	    return 0;
	return &strset_buf[index];
    case FcStorageDynamic:
	return set->u.strs[i];
    default:
	return 0;
    }
}

FcStrSet *
FcStrSetPtrU (const FcStrSetPtr set)
{
    switch (set.storage)
    {
    case FcStorageStatic:
	return &strsets[set.u.stat];
    case FcStorageDynamic:
	return (FcStrSet *)set.u.dyn;
    default:
	return 0;
    }
}

FcStrSetPtr
FcStrSetPtrCreateDynamic (const FcStrSet * set)
{
    FcStrSetPtr new;

    new.storage = FcStorageDynamic;
    new.u.dyn = (FcStrSet *)set;
    return new;
}

static FcBool
_FcStrSetAppend (FcStrSet *set, FcChar8 *s)
{
    if (FcStrSetMember (set, s))
    {
	FcStrFree (s);
	return FcTrue;
    }
    if (set->num == set->size || set->storage == FcStorageStatic)
    {
	FcChar8	**strs = malloc ((set->size + 2) * sizeof (FcChar8 *));

	if (!strs)
	    return FcFalse;
	FcMemAlloc (FC_MEM_STRSET, (set->size + 2) * sizeof (FcChar8 *));
	set->size = set->size + 1;
	if (set->storage == FcStorageDynamic)
	{
	    if (set->num)
		memcpy (strs, set->u.strs, set->num * sizeof (FcChar8 *));
	    if (set->u.strs)
		free (set->u.strs);
	}
	else 
	{
	    if (set->num)
		memcpy (strs, strset_idx+set->u.stridx_offset, 
			set->num * sizeof (FcChar8 *));
	    set->storage = FcStorageDynamic;
	}
	set->u.strs = strs;
    }
    set->u.strs[set->num++] = s;
    set->u.strs[set->num] = 0;
    return FcTrue;
}

FcBool
FcStrSetMember (FcStrSet *set, const FcChar8 *s)
{
    int	i;

    for (i = 0; i < set->num; i++)
	if (!FcStrCmp (FcStrSetGet(set, i), s))
	    return FcTrue;
    return FcFalse;
}

FcBool
FcStrSetEqual (FcStrSet *sa, FcStrSet *sb)
{
    int	i;
    if (sa->num != sb->num)
	return FcFalse;
    for (i = 0; i < sa->num; i++)
	if (!FcStrSetMember (sb, FcStrSetGet(sa, i)))
	    return FcFalse;
    return FcTrue;
}

FcBool
FcStrSetAdd (FcStrSet *set, const FcChar8 *s)
{
    FcChar8 *new = FcStrCopy (s);
    if (!new)
	return FcFalse;
    if (!_FcStrSetAppend (set, new))
    {
	FcStrFree (new);
	return FcFalse;
    }
    return FcTrue;
}

FcBool
FcStrSetAddFilename (FcStrSet *set, const FcChar8 *s)
{
    FcChar8 *new = FcStrCopyFilename (s);
    if (!new)
	return FcFalse;
    if (!_FcStrSetAppend (set, new))
    {
	FcStrFree (new);
	return FcFalse;
    }
    return FcTrue;
}

FcBool
FcStrSetDel (FcStrSet *set, const FcChar8 *s)
{
    int	i;

    for (i = 0; i < set->num; i++)
	if (!FcStrCmp (FcStrSetGet(set, i), s))
	{
	    if (set->storage == FcStorageDynamic)
		FcStrFree (set->u.strs[i]);
	    /*
	     * copy remaining string pointers and trailing
	     * NULL
	     */
	    memmove (FcStrSetGet(set, i), FcStrSetGet(set, i+1),
		     (set->num - i) * sizeof (FcChar8 *));
	    set->num--;
	    return FcTrue;
	}
    return FcFalse;
}

void
FcStrSetDestroy (FcStrSet *set)
{
    if (--set->ref == 0)
    {
	int	i;
    
	if (set->storage == FcStorageDynamic)
	{
	    for (i = 0; i < set->num; i++)
		FcStrFree (set->u.strs[i]);
	    FcMemFree (FC_MEM_STRSET, (set->size) * sizeof (FcChar8 *));
	    if (set->u.strs)
		free (set->u.strs);
	    FcMemFree (FC_MEM_STRSET, sizeof (FcStrSet));
	}
	free (set);
    }
}

static int _FcStrSetSort_helper (const void * a, const void * b)
{
    return FcStrCmp (&strset_buf[(int)a], 
		     &strset_buf[(int)b]);
}

void
FcStrSetSort (FcStrSet * set)
{
    switch (set->storage)
    {
    case FcStorageDynamic:
	qsort (set->u.strs, set->num, sizeof (FcChar8 *), 
	       (int (*)(const void *, const void *)) FcStrCmp);
	break;
    case FcStorageStatic:
	qsort (strset_idx+set->u.stridx_offset, set->num, sizeof (int), 
	       _FcStrSetSort_helper);
	break;
    default:
	break;
    }
}

FcBool
FcStrSetPrepareSerialize (const FcStrSet *set)
{
    int i;

    if (!set)
	return FcTrue;

    strset_count ++;
    strset_idx_count += set->num;
    for (i = 0; i < set->num; i++)
    {
	if (FcStrSetGet(set, i))
	    strset_buf_count += strlen(FcStrSetGet(set, i));
    }

    return FcTrue;
}

FcStrSetPtr
FcStrSetSerialize (FcStrSet *set)
{
    FcStrSet * new;
    FcStrSetPtr newp;
    int i;

    if (!strsets)
    {
	strsets = malloc (strset_count * sizeof(FcStrSet));
	if (!strsets) goto bail1;
	strset_idx = malloc (strset_idx_count * sizeof(int));
	if (!strset_idx) goto bail2;
	strset_buf = malloc (strset_buf_count * sizeof (FcChar8));
	if (!strset_buf) goto bail3;
    }

    if (!set)
	return FcStrSetPtrCreateDynamic(0);

    newp.storage = FcStorageStatic;
    newp.u.stat = strset_ptr;

    new = &strsets[strset_ptr++];
    new->ref = set->ref;
    new->num = set->num;
    new->size = set->num;
    new->storage = FcStorageStatic;
    new->u.stridx_offset = strset_idx_ptr;
    for (i = 0; i < set->num; i++)
    {
	FcChar8 * s = FcStrSetGet(set, i);

	if (s)
	{
	    memcpy(strset_buf+strset_buf_ptr, s,
		   strlen((char *)s));
	    strset_idx[strset_idx_ptr++] = strset_buf_ptr;
	    strset_buf_ptr += strlen((char *)s)+1;
	}
	else
	    strset_idx[strset_idx_ptr++] = -1;
    }

    if (strset_ptr > strset_count || strset_idx_ptr > strset_idx_count)
	return FcStrSetPtrCreateDynamic(0);

    // problem with multiple ptrs to the same StrSet.
    // should hash StrSets or something.
    // FcStrSetDestroy (set);

    return newp;

 bail3:
    free (strset_idx);
 bail2:
    free (strsets);
 bail1:
    return FcStrSetPtrCreateDynamic(0);
}

FcBool
FcStrSetRead (int fd, FcCache metadata)
{
    strsets = mmap(NULL, 
		   metadata.strsets_length * sizeof (FcStrSet),
		   PROT_READ,
		   MAP_SHARED, fd, metadata.strsets_offset);
    if (strsets == MAP_FAILED)
        goto bail;
    strset_count = strset_ptr = metadata.strsets_length;

    strset_idx = mmap(NULL, 
		      metadata.strsets_idx_length * sizeof (int),
		      PROT_READ,
		      MAP_SHARED, fd, metadata.strsets_idx_offset);
    if (strset_idx == MAP_FAILED)
        goto bail1;
    strset_idx_count = strset_idx_ptr = metadata.strsets_length;

    strset_buf = mmap(NULL,
		      metadata.strset_buf_length * sizeof (char),
		      PROT_READ,
		      MAP_SHARED, fd, metadata.strset_buf_offset);
    if (strset_buf == MAP_FAILED)
	goto bail2;
    strset_buf_count = strset_buf_ptr = metadata.strset_buf_length;

    return FcTrue;

 bail2:
    munmap (strset_idx, metadata.strsets_idx_length * sizeof (int));
 bail1:
    munmap (strsets, metadata.strsets_length * sizeof (FcStrSet));
 bail:
    return FcFalse;
}

FcBool
FcStrSetWrite (int fd, FcCache *metadata)
{
    metadata->strsets_length = strset_ptr;
    metadata->strsets_offset = FcCacheNextOffset(fd);
    if (strset_ptr > 0)
    {
	lseek (fd, metadata->strsets_offset, SEEK_SET);
	if (write (fd, strsets, strset_ptr * sizeof(FcStrSet)) == -1)
	    return FcFalse;
    }

    metadata->strsets_idx_length = strset_idx_ptr;
    metadata->strsets_idx_offset = FcCacheNextOffset(fd);
    if (strset_idx_ptr > 0)
    {
	lseek (fd, metadata->strsets_idx_offset, SEEK_SET);
	if (write (fd, strset_idx, strset_idx_ptr * sizeof (int)) == -1)
	    return FcFalse;
    }

    metadata->strset_buf_offset = FcCacheNextOffset(fd);
    metadata->strset_buf_length = strset_buf_ptr;
    if (strset_buf_ptr > 0)
    {
	lseek (fd, metadata->strset_buf_offset, SEEK_SET);
	if (write (fd, strset_buf, 
		   metadata->strset_buf_length * sizeof (char)) == -1)
	    return FcFalse;
    }

    return FcTrue;
}

FcStrList *
FcStrListCreate (FcStrSet *set)
{
    FcStrList	*list;

    list = malloc (sizeof (FcStrList));
    if (!list)
	return 0;
    FcMemAlloc (FC_MEM_STRLIST, sizeof (FcStrList));
    list->set = set;
    set->ref++;
    list->n = 0;
    return list;
}

FcChar8 *
FcStrListNext (FcStrList *list)
{
    if (list->n >= list->set->num)
	return 0;
    return FcStrSetGet(list->set, list->n++);
}

void
FcStrListDone (FcStrList *list)
{
    FcStrSetDestroy (list->set);
    FcMemFree (FC_MEM_STRLIST, sizeof (FcStrList));
    free (list);
}