utf32.c

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// SPDX-FileCopyrightText: 2017 kazarmy <kazarmy@gmail.com>
// SPDX-License-Identifier: LGPL-3.0-only
 
#include <rz_types.h>
#include <rz_util.h>
 
/* Convert an UTF-32 buf into a unicode RzRune */
RZ_API int rz_utf32_decode(const ut8 *ptr, int ptrlen, RzRune *ch, bool bigendian) {
    if (ptrlen < 1) {
        return 0;
    }
    int low = 0;
    int high = 3;
    if (bigendian) {
        low = 3;
        high = 0;
    }
    if (ptrlen > 3) {
        int sign = bigendian ? -1 : 1;
        if (ch) {
            int i;
            *ch = (ut32)ptr[low];
            for (i = 1; i < 4; i++) {
                *ch |= (ut32)ptr[3 - high + i * sign] << 8 * i;
            }
        }
        if (ptr[high] || ptr[high - 1 * sign]) {
            return 4;
        }
        if (ptr[low + 1 * sign]) {
            return 2;
        }
        return 1;
    }
    return 0;
}
 
/* Convert an UTF-32LE buf into a unicode RzRune */
RZ_API int rz_utf32le_decode(const ut8 *ptr, int ptrlen, RzRune *ch) {
    return rz_utf32_decode(ptr, ptrlen, ch, false);
}
 
/* Convert an UTF-32BE buf into a unicode RzRune */
RZ_API int rz_utf32be_decode(const ut8 *ptr, int ptrlen, RzRune *ch) {
    return rz_utf32_decode(ptr, ptrlen, ch, true);
}