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/* vi:set ts=8 sts=4 sw=4:
*
* VIM - Vi IMproved by Bram Moolenaar
*
* Do ":help uganda" in Vim to read copying and usage conditions.
* Do ":help credits" in Vim to see a list of people who contributed.
* See README.txt for an overview of the Vim source code.
*/
/*
* os_mac_conv.c: Code specifically for Mac string conversions.
*
* This code has been put in a separate file to avoid the conflicts that are
* caused by including both the X11 and Carbon header files.
*/

#define NO_X11_INCLUDES
#include "vim.h"

#if defined(MACOS_CONVERT) || defined(PROTO)
# ifdef PROTO
/* A few dummy types to be able to generate function prototypes. */
typedef int UniChar;
typedef int *TECObjectRef;
typedef int CFStringRef;
# endif

static char_u *mac_utf16_to_utf8 __ARGS((UniChar *from, size_t fromLen, size_t *actualLen));
static UniChar *mac_utf8_to_utf16 __ARGS((char_u *from, size_t fromLen, size_t *actualLen));

/* Converter for composing decomposed HFS+ file paths */
static TECObjectRef gPathConverter;
/* Converter used by mac_utf16_to_utf8 */
static TECObjectRef gUTF16ToUTF8Converter;

/*
* A Mac version of string_convert_ext() for special cases.
*/
    char_u *
mac_string_convert(ptr, len, lenp, fail_on_error, from_enc, to_enc, unconvlenp)
    char_u *ptr;
    int len;
    int *lenp;
    int fail_on_error;
    int from_enc;
    int to_enc;
    int *unconvlenp;
{
    char_u *retval, *d;
    CFStringRef cfstr;
    int buflen, in, out, l, i;
    CFStringEncoding from;
    CFStringEncoding to;

    switch (from_enc)
    {
case 'l': from = kCFStringEncodingISOLatin1; break;
case 'm': from = kCFStringEncodingMacRoman; break;
case 'u': from = kCFStringEncodingUTF8; break;
default: return NULL;
    }
    switch (to_enc)
    {
case 'l': to = kCFStringEncodingISOLatin1; break;
case 'm': to = kCFStringEncodingMacRoman; break;
case 'u': to = kCFStringEncodingUTF8; break;
default: return NULL;
    }

    if (unconvlenp != NULL)
*unconvlenp = 0;
    cfstr = CFStringCreateWithBytes(NULL, ptr, len, from, 0);

    if(cfstr == NULL)
fprintf(stderr, "Encoding failed\n");
    /* When conversion failed, try excluding bytes from the end, helps when
* there is an incomplete byte sequence. Only do up to 6 bytes to avoid
* looping a long time when there really is something unconvertible. */
    while (cfstr == NULL && unconvlenp != NULL && len > 1 && *unconvlenp < 6)
    {
--len;
++*unconvlenp;
cfstr = CFStringCreateWithBytes(NULL, ptr, len, from, 0);
    }
    if (cfstr == NULL)
return NULL;

    if (to == kCFStringEncodingUTF8)
buflen = len * 6 + 1;
    else
buflen = len + 1;
    retval = alloc(buflen);
    if (retval == NULL)
    {
CFRelease(cfstr);
return NULL;
    }

#if 0
    CFRange convertRange = CFRangeMake(0, CFStringGetLength(cfstr));
    /* Determine output buffer size */
    CFStringGetBytes(cfstr, convertRange, to, NULL, FALSE, NULL, 0, (CFIndex *)&buflen);
    retval = (buflen > 0) ? alloc(buflen) : NULL;
    if (retval == NULL) {
CFRelease(cfstr);
return NULL;
    }

    if (lenp)
*lenp = buflen / sizeof(char_u);

    if (!CFStringGetBytes(cfstr, convertRange, to, NULL, FALSE, retval, buflen, NULL))
#endif
    if (!CFStringGetCString(cfstr, (char *)retval, buflen, to))
    {
CFRelease(cfstr);
if (fail_on_error)
{
vim_free(retval);
return NULL;
}

fprintf(stderr, "Trying char-by-char conversion...\n");
/* conversion failed for the whole string, but maybe it will work
* for each character */
for (d = retval, in = 0, out = 0; in < len && out < buflen - 1;)
{
if (from == kCFStringEncodingUTF8)
l = utf_ptr2len(ptr + in);
else
l = 1;
cfstr = CFStringCreateWithBytes(NULL, ptr + in, l, from, 0);
if (cfstr == NULL)
{
*d++ = '?';
out++;
}
else
{
if (!CFStringGetCString(cfstr, (char *)d, buflen - out, to))
{
*d++ = '?';
out++;
}
else
{
i = STRLEN(d);
d += i;
out += i;
}
CFRelease(cfstr);
}
in += l;
}
*d = NUL;
if (lenp != NULL)
*lenp = out;
return retval;
    }
    CFRelease(cfstr);
    if (lenp != NULL)
*lenp = STRLEN(retval);

    return retval;
}

/*
* Conversion from Apple MacRoman char encoding to UTF-8 or latin1, using
* standard Carbon framework.
* Input: "ptr[*sizep]".
* "real_size" is the size of the buffer that "ptr" points to.
* output is in-place, "sizep" is adjusted.
* Returns OK or FAIL.
*/
    int
macroman2enc(ptr, sizep, real_size)
    char_u *ptr;
    long *sizep;
    long real_size;
{
    CFStringRef cfstr;
    CFRange r;
    CFIndex len = *sizep;

    /* MacRoman is an 8-bit encoding, no need to move bytes to
* conv_rest[]. */
    cfstr = CFStringCreateWithBytes(NULL, ptr, len,
kCFStringEncodingMacRoman, 0);
    /*
* If there is a conversion error, try using another
* conversion.
*/
    if (cfstr == NULL)
return FAIL;

    r.location = 0;
    r.length = CFStringGetLength(cfstr);
    if (r.length != CFStringGetBytes(cfstr, r,
(enc_utf8) ? kCFStringEncodingUTF8 : kCFStringEncodingISOLatin1,
0, /* no lossy conversion */
0, /* not external representation */
ptr + *sizep, real_size - *sizep, &len))
    {
CFRelease(cfstr);
return FAIL;
    }
    CFRelease(cfstr);
    mch_memmove(ptr, ptr + *sizep, len);
    *sizep = len;

    return OK;
}

/*
* Conversion from UTF-8 or latin1 to MacRoman.
* Input: "from[fromlen]"
* Output: "to[maxtolen]" length in "*tolenp"
* Unconverted rest in rest[*restlenp].
* Returns OK or FAIL.
*/
    int
enc2macroman(from, fromlen, to, tolenp, maxtolen, rest, restlenp)
    char_u *from;
    size_t fromlen;
    char_u *to;
    int *tolenp;
    int maxtolen;
    char_u *rest;
    int *restlenp;
{
    CFStringRef cfstr;
    CFRange r;
    CFIndex l;

    *restlenp = 0;
    cfstr = CFStringCreateWithBytes(NULL, from, fromlen,
(enc_utf8) ? kCFStringEncodingUTF8 : kCFStringEncodingISOLatin1,
0);
    while (cfstr == NULL && *restlenp < 3 && fromlen > 1)
    {
rest[*restlenp++] = from[--fromlen];
cfstr = CFStringCreateWithBytes(NULL, from, fromlen,
(enc_utf8) ? kCFStringEncodingUTF8 : kCFStringEncodingISOLatin1,
0);
    }
    if (cfstr == NULL)
return FAIL;

    r.location = 0;
    r.length = CFStringGetLength(cfstr);
    if (r.length != CFStringGetBytes(cfstr, r,
kCFStringEncodingMacRoman,
0, /* no lossy conversion */
0, /* not external representation (since vim
* handles this internally */
to, maxtolen, &l))
    {
CFRelease(cfstr);
return FAIL;
    }
    CFRelease(cfstr);
    *tolenp = l;
    return OK;
}

/*
* Initializes text converters
*/
    void
mac_conv_init()
{
    TextEncoding utf8_encoding;
    TextEncoding utf8_hfsplus_encoding;
    TextEncoding utf8_canon_encoding;
    TextEncoding utf16_encoding;

    utf8_encoding = CreateTextEncoding(kTextEncodingUnicodeDefault,
kTextEncodingDefaultVariant, kUnicodeUTF8Format);
    utf8_hfsplus_encoding = CreateTextEncoding(kTextEncodingUnicodeDefault,
kUnicodeHFSPlusCompVariant, kUnicodeUTF8Format);
    utf8_canon_encoding = CreateTextEncoding(kTextEncodingUnicodeDefault,
kUnicodeCanonicalCompVariant, kUnicodeUTF8Format);
    utf16_encoding = CreateTextEncoding(kTextEncodingUnicodeDefault,
kTextEncodingDefaultVariant, kUnicode16BitFormat);

    if (TECCreateConverter(&gPathConverter, utf8_encoding,
utf8_hfsplus_encoding) != noErr)
gPathConverter = NULL;

    if (TECCreateConverter(&gUTF16ToUTF8Converter, utf16_encoding,
utf8_canon_encoding) != noErr)
    {
/* On pre-10.3, Unicode normalization is not available so
* fall back to non-normalizing converter */
if (TECCreateConverter(&gUTF16ToUTF8Converter, utf16_encoding,
utf8_encoding) != noErr)
gUTF16ToUTF8Converter = NULL;
    }
}

/*
* Destroys text converters
*/
    void
mac_conv_cleanup()
{
    if (gUTF16ToUTF8Converter)
    {
TECDisposeConverter(gUTF16ToUTF8Converter);
gUTF16ToUTF8Converter = NULL;
    }

    if (gPathConverter)
    {
TECDisposeConverter(gPathConverter);
gPathConverter = NULL;
    }
}

/*
* Conversion from UTF-16 UniChars to 'encoding'
* The function signature uses the real type of UniChar (as typedef'ed in
* CFBase.h) to avoid clashes with X11 header files in the .pro file
*/
    char_u *
mac_utf16_to_enc(from, fromLen, actualLen)
    unsigned short *from;
    size_t fromLen;
    size_t *actualLen;
{
    /* Following code borrows somewhat from os_mswin.c */
    vimconv_T conv;
    size_t utf8_len;
    char_u *utf8_str;
    char_u *result = NULL;

    /* Convert to utf-8 first, works better with iconv */
    utf8_len = 0;
    utf8_str = mac_utf16_to_utf8(from, fromLen, &utf8_len);

    if (utf8_str)
    {
/* We might be called before we have p_enc set up. */
conv.vc_type = CONV_NONE;

/* If encoding (p_enc) is any unicode, it is actually in utf-8 (vim
* internal unicode is always utf-8) so don't convert in such cases */

if ((enc_canon_props(p_enc) & ENC_UNICODE) == 0)
convert_setup(&conv, (char_u *)"utf-8",
p_enc? p_enc: (char_u *)"macroman");
if (conv.vc_type == CONV_NONE)
{
/* p_enc is utf-8, so we're done. */
result = utf8_str;
}
else
{
result = string_convert(&conv, utf8_str, (int *)&utf8_len);
vim_free(utf8_str);
}

convert_setup(&conv, NULL, NULL);

if (actualLen)
*actualLen = utf8_len;
    }
    else if (actualLen)
*actualLen = 0;

    return result;
}

/*
* Conversion from 'encoding' to UTF-16 UniChars
* The function return uses the real type of UniChar (as typedef'ed in
* CFBase.h) to avoid clashes with X11 header files in the .pro file
*/
    unsigned short *
mac_enc_to_utf16(from, fromLen, actualLen)
    char_u *from;
    size_t fromLen;
    size_t *actualLen;
{
    /* Following code borrows somewhat from os_mswin.c */
    vimconv_T conv;
    size_t utf8_len;
    char_u *utf8_str;
    UniChar *result = NULL;
    Boolean should_free_utf8 = FALSE;

    do
    {
/* Use MacRoman by default, we might be called before we have p_enc
* set up. Convert to utf-8 first, works better with iconv(). Does
* nothing if 'encoding' is "utf-8". */
conv.vc_type = CONV_NONE;
if ((enc_canon_props(p_enc) & ENC_UNICODE) == 0 &&
convert_setup(&conv, p_enc ? p_enc : (char_u *)"macroman",
(char_u *)"utf-8") == FAIL)
break;

if (conv.vc_type != CONV_NONE)
{
utf8_len = fromLen;
utf8_str = string_convert(&conv, from, (int *)&utf8_len);
should_free_utf8 = TRUE;
}
else
{
utf8_str = from;
utf8_len = fromLen;
}

if (utf8_str == NULL)
break;

convert_setup(&conv, NULL, NULL);

result = mac_utf8_to_utf16(utf8_str, utf8_len, actualLen);

if (should_free_utf8)
vim_free(utf8_str);
return result;
    }
    while (0);

    if (actualLen)
*actualLen = 0;

    return result;
}

/*
* Converts from UTF-16 UniChars to CFString
* The void * return type is actually a CFStringRef
*/
    void *
mac_enc_to_cfstring(from, fromLen)
    char_u *from;
    size_t fromLen;
{
    UniChar *utf16_str;
    size_t utf16_len;
    CFStringRef result = NULL;

    utf16_str = mac_enc_to_utf16(from, fromLen, &utf16_len);
    if (utf16_str)
    {
result = CFStringCreateWithCharacters(NULL, utf16_str, utf16_len/sizeof(UniChar));
vim_free(utf16_str);
    }

    return (void *)result;
}

/*
* Converts a decomposed HFS+ UTF-8 path to precomposed UTF-8
*/
    char_u *
mac_precompose_path(decompPath, decompLen, precompLen)
    char_u *decompPath;
    size_t decompLen;
    size_t *precompLen;
{
    char_u *result = NULL;
    size_t actualLen = 0;

    if (gPathConverter)
    {
result = alloc(decompLen);
if (result)
{
if (TECConvertText(gPathConverter, decompPath,
decompLen, &decompLen, result,
decompLen, &actualLen) != noErr)
{
vim_free(result);
result = NULL;
}
}
    }

    if (precompLen)
*precompLen = actualLen;

    return result;
}

/*
* Converts from UTF-16 UniChars to precomposed UTF-8
*/
    static char_u *
mac_utf16_to_utf8(from, fromLen, actualLen)
    UniChar *from;
    size_t fromLen;
    size_t *actualLen;
{
    ByteCount utf8_len;
    ByteCount inputRead;
    char_u *result;

    if (gUTF16ToUTF8Converter)
    {
result = alloc(fromLen * 6 + 1);
if (result && TECConvertText(gUTF16ToUTF8Converter, (ConstTextPtr)from,
fromLen, &inputRead, result,
(fromLen*6+1)*sizeof(char_u), &utf8_len) == noErr)
{
TECFlushText(gUTF16ToUTF8Converter, result, (fromLen*6+1)*sizeof(char_u), &inputRead);
utf8_len += inputRead;
}
else
{
vim_free(result);
result = NULL;
}
    }
    else
    {
result = NULL;
    }

    if (actualLen)
*actualLen = result ? utf8_len : 0;

    return result;
}

/*
* Converts from UTF-8 to UTF-16 UniChars
*/
    static UniChar *
mac_utf8_to_utf16(from, fromLen, actualLen)
    char_u *from;
    size_t fromLen;
    size_t *actualLen;
{
    CFStringRef utf8_str;
    CFRange convertRange;
    UniChar *result = NULL;

    utf8_str = CFStringCreateWithBytes(NULL, from, fromLen,
kCFStringEncodingUTF8, FALSE);

    if (utf8_str == NULL) {
if (actualLen)
*actualLen = 0;
return NULL;
    }

    convertRange = CFRangeMake(0, CFStringGetLength(utf8_str));
    result = (UniChar *)alloc(convertRange.length * sizeof(UniChar));

    CFStringGetCharacters(utf8_str, convertRange, result);

    CFRelease(utf8_str);

    if (actualLen)
*actualLen = convertRange.length * sizeof(UniChar);

    return result;
}

/*
* Sets LANG environment variable in Vim from Mac locale
*/
    void
mac_lang_init() {
    if (mch_getenv((char_u *)"LANG") == NULL)
    {
char buf[20];
if (LocaleRefGetPartString(NULL,
kLocaleLanguageMask | kLocaleLanguageVariantMask |
kLocaleRegionMask | kLocaleRegionVariantMask,
sizeof buf, buf) == noErr && *buf)
{
vim_setenv((char_u *)"LANG", (char_u *)buf);
# ifdef HAVE_LOCALE_H
setlocale(LC_ALL, "");
# endif
}
    }
}
#endif /* MACOS_CONVERT */
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