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-rw-r--r--sys/contrib/openzfs/module/unicode/uconv.c863
1 files changed, 863 insertions, 0 deletions
diff --git a/sys/contrib/openzfs/module/unicode/uconv.c b/sys/contrib/openzfs/module/unicode/uconv.c
new file mode 100644
index 000000000000..fe84979d08b2
--- /dev/null
+++ b/sys/contrib/openzfs/module/unicode/uconv.c
@@ -0,0 +1,863 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
+ * Use is subject to license terms.
+ */
+
+
+
+/*
+ * Unicode encoding conversion functions among UTF-8, UTF-16, and UTF-32.
+ * (PSARC/2005/446, PSARC/2007/038, PSARC/2007/517)
+ * Man pages: uconv_u16tou32(9F), uconv_u16tou8(9F), uconv_u32tou16(9F),
+ * uconv_u32tou8(9F), uconv_u8tou16(9F), and uconv_u8tou32(9F). See also
+ * the section 3C man pages.
+ * Interface stability: Committed
+ */
+
+#include <sys/types.h>
+#ifdef _KERNEL
+#include <sys/param.h>
+#include <sys/sysmacros.h>
+#include <sys/debug.h>
+#include <sys/kmem.h>
+#include <sys/sunddi.h>
+#else
+#include <sys/u8_textprep.h>
+#endif /* _KERNEL */
+#include <sys/byteorder.h>
+#include <sys/errno.h>
+
+
+/*
+ * The max and min values of high and low surrogate pairs of UTF-16,
+ * UTF-16 bit shift value, bit mask, and starting value outside of BMP.
+ */
+#define UCONV_U16_HI_MIN (0xd800U)
+#define UCONV_U16_HI_MAX (0xdbffU)
+#define UCONV_U16_LO_MIN (0xdc00U)
+#define UCONV_U16_LO_MAX (0xdfffU)
+#define UCONV_U16_BIT_SHIFT (0x0400U)
+#define UCONV_U16_BIT_MASK (0x0fffffU)
+#define UCONV_U16_START (0x010000U)
+
+/* The maximum value of Unicode coding space and ASCII coding space. */
+#define UCONV_UNICODE_MAX (0x10ffffU)
+#define UCONV_ASCII_MAX (0x7fU)
+
+/* The mask values for input and output endians. */
+#define UCONV_IN_ENDIAN_MASKS (UCONV_IN_BIG_ENDIAN | UCONV_IN_LITTLE_ENDIAN)
+#define UCONV_OUT_ENDIAN_MASKS (UCONV_OUT_BIG_ENDIAN | UCONV_OUT_LITTLE_ENDIAN)
+
+/* Native and reversed endian macros. */
+#ifdef _ZFS_BIG_ENDIAN
+#define UCONV_IN_NAT_ENDIAN UCONV_IN_BIG_ENDIAN
+#define UCONV_IN_REV_ENDIAN UCONV_IN_LITTLE_ENDIAN
+#define UCONV_OUT_NAT_ENDIAN UCONV_OUT_BIG_ENDIAN
+#define UCONV_OUT_REV_ENDIAN UCONV_OUT_LITTLE_ENDIAN
+#else
+#define UCONV_IN_NAT_ENDIAN UCONV_IN_LITTLE_ENDIAN
+#define UCONV_IN_REV_ENDIAN UCONV_IN_BIG_ENDIAN
+#define UCONV_OUT_NAT_ENDIAN UCONV_OUT_LITTLE_ENDIAN
+#define UCONV_OUT_REV_ENDIAN UCONV_OUT_BIG_ENDIAN
+#endif /* _BIG_ENDIAN */
+
+/* The Byte Order Mark (BOM) character in normal and reversed byte orderings. */
+#define UCONV_BOM_NORMAL (0xfeffU)
+#define UCONV_BOM_SWAPPED (0xfffeU)
+#define UCONV_BOM_SWAPPED_32 (0xfffe0000U)
+
+/* UTF-32 boundaries based on UTF-8 character byte lengths. */
+#define UCONV_U8_ONE_BYTE (0x7fU)
+#define UCONV_U8_TWO_BYTES (0x7ffU)
+#define UCONV_U8_THREE_BYTES (0xffffU)
+#define UCONV_U8_FOUR_BYTES (0x10ffffU)
+
+/* The common minimum and maximum values at the UTF-8 character bytes. */
+#define UCONV_U8_BYTE_MIN (0x80U)
+#define UCONV_U8_BYTE_MAX (0xbfU)
+
+/*
+ * The following "6" and "0x3f" came from "10xx xxxx" bit representation of
+ * UTF-8 character bytes.
+ */
+#define UCONV_U8_BIT_SHIFT 6
+#define UCONV_U8_BIT_MASK 0x3f
+
+/*
+ * The following vector shows remaining bytes in a UTF-8 character.
+ * Index will be the first byte of the character.
+ */
+static const uchar_t remaining_bytes_tbl[0x100] = {
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+
+/* C0 C1 C2 C3 C4 C5 C6 C7 C8 C9 CA CB CC CD CE CF */
+ 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+
+/* D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB DC DD DE DF */
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+
+/* E0 E1 E2 E3 E4 E5 E6 E7 E8 E9 EA EB EC ED EE EF */
+ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+
+/* F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 FA FB FC FD FE FF */
+ 3, 3, 3, 3, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+};
+
+/*
+ * The following is a vector of bit-masks to get used bits in
+ * the first byte of a UTF-8 character. Index is remaining bytes at above of
+ * the character.
+ */
+#ifdef _KERNEL
+const uchar_t u8_masks_tbl[6] = { 0x00, 0x1f, 0x0f, 0x07, 0x03, 0x01 };
+#else
+static const uchar_t u8_masks_tbl[6] = { 0x00, 0x1f, 0x0f, 0x07, 0x03, 0x01 };
+#endif /* _KERNEL */
+
+/*
+ * The following two vectors are to provide valid minimum and
+ * maximum values for the 2'nd byte of a multibyte UTF-8 character for
+ * better illegal sequence checking. The index value must be the value of
+ * the first byte of the UTF-8 character.
+ */
+static const uchar_t valid_min_2nd_byte[0x100] = {
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+
+/* C0 C1 C2 C3 C4 C5 C6 C7 */
+ 0, 0, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+
+/* C8 C9 CA CB CC CD CE CF */
+ 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+
+/* D0 D1 D2 D3 D4 D5 D6 D7 */
+ 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+
+/* D8 D9 DA DB DC DD DE DF */
+ 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+
+/* E0 E1 E2 E3 E4 E5 E6 E7 */
+ 0xa0, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+
+/* E8 E9 EA EB EC ED EE EF */
+ 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+
+/* F0 F1 F2 F3 F4 F5 F6 F7 */
+ 0x90, 0x80, 0x80, 0x80, 0x80, 0, 0, 0,
+
+ 0, 0, 0, 0, 0, 0, 0, 0
+};
+
+static const uchar_t valid_max_2nd_byte[0x100] = {
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+
+/* C0 C1 C2 C3 C4 C5 C6 C7 */
+ 0, 0, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf,
+
+/* C8 C9 CA CB CC CD CE CF */
+ 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf,
+
+/* D0 D1 D2 D3 D4 D5 D6 D7 */
+ 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf,
+
+/* D8 D9 DA DB DC DD DE DF */
+ 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf,
+
+/* E0 E1 E2 E3 E4 E5 E6 E7 */
+ 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0xbf,
+
+/* E8 E9 EA EB EC ED EE EF */
+ 0xbf, 0xbf, 0xbf, 0xbf, 0xbf, 0x9f, 0xbf, 0xbf,
+
+/* F0 F1 F2 F3 F4 F5 F6 F7 */
+ 0xbf, 0xbf, 0xbf, 0xbf, 0x8f, 0, 0, 0,
+
+ 0, 0, 0, 0, 0, 0, 0, 0
+};
+
+
+static int
+check_endian(int flag, int *in, int *out)
+{
+ *in = flag & UCONV_IN_ENDIAN_MASKS;
+
+ /* You cannot have both. */
+ if (*in == UCONV_IN_ENDIAN_MASKS)
+ return (EBADF);
+
+ if (*in == 0)
+ *in = UCONV_IN_NAT_ENDIAN;
+
+ *out = flag & UCONV_OUT_ENDIAN_MASKS;
+
+ /* You cannot have both. */
+ if (*out == UCONV_OUT_ENDIAN_MASKS)
+ return (EBADF);
+
+ if (*out == 0)
+ *out = UCONV_OUT_NAT_ENDIAN;
+
+ return (0);
+}
+
+static boolean_t
+check_bom16(const uint16_t *u16s, size_t u16l, int *in)
+{
+ if (u16l > 0) {
+ if (*u16s == UCONV_BOM_NORMAL) {
+ *in = UCONV_IN_NAT_ENDIAN;
+ return (B_TRUE);
+ }
+ if (*u16s == UCONV_BOM_SWAPPED) {
+ *in = UCONV_IN_REV_ENDIAN;
+ return (B_TRUE);
+ }
+ }
+
+ return (B_FALSE);
+}
+
+static boolean_t
+check_bom32(const uint32_t *u32s, size_t u32l, int *in)
+{
+ if (u32l > 0) {
+ if (*u32s == UCONV_BOM_NORMAL) {
+ *in = UCONV_IN_NAT_ENDIAN;
+ return (B_TRUE);
+ }
+ if (*u32s == UCONV_BOM_SWAPPED_32) {
+ *in = UCONV_IN_REV_ENDIAN;
+ return (B_TRUE);
+ }
+ }
+
+ return (B_FALSE);
+}
+
+int
+uconv_u16tou32(const uint16_t *u16s, size_t *utf16len,
+ uint32_t *u32s, size_t *utf32len, int flag)
+{
+ int inendian;
+ int outendian;
+ size_t u16l;
+ size_t u32l;
+ uint32_t hi;
+ uint32_t lo;
+ boolean_t do_not_ignore_null;
+
+ /*
+ * Do preliminary validity checks on parameters and collect info on
+ * endians.
+ */
+ if (u16s == NULL || utf16len == NULL)
+ return (EILSEQ);
+
+ if (u32s == NULL || utf32len == NULL)
+ return (E2BIG);
+
+ if (check_endian(flag, &inendian, &outendian) != 0)
+ return (EBADF);
+
+ /*
+ * Initialize input and output parameter buffer indices and
+ * temporary variables.
+ */
+ u16l = u32l = 0;
+ hi = 0;
+ do_not_ignore_null = ((flag & UCONV_IGNORE_NULL) == 0);
+
+ /*
+ * Check on the BOM at the beginning of the input buffer if required
+ * and if there is indeed one, process it.
+ */
+ if ((flag & UCONV_IN_ACCEPT_BOM) &&
+ check_bom16(u16s, *utf16len, &inendian))
+ u16l++;
+
+ /*
+ * Reset inendian and outendian so that after this point, those can be
+ * used as condition values.
+ */
+ inendian &= UCONV_IN_NAT_ENDIAN;
+ outendian &= UCONV_OUT_NAT_ENDIAN;
+
+ /*
+ * If there is something in the input buffer and if necessary and
+ * requested, save the BOM at the output buffer.
+ */
+ if (*utf16len > 0 && *utf32len > 0 && (flag & UCONV_OUT_EMIT_BOM))
+ u32s[u32l++] = (outendian) ? UCONV_BOM_NORMAL :
+ UCONV_BOM_SWAPPED_32;
+
+ /*
+ * Do conversion; if encounter a surrogate pair, assemble high and
+ * low pair values to form a UTF-32 character. If a half of a pair
+ * exists alone, then, either it is an illegal (EILSEQ) or
+ * invalid (EINVAL) value.
+ */
+ for (; u16l < *utf16len; u16l++) {
+ if (u16s[u16l] == 0 && do_not_ignore_null)
+ break;
+
+ lo = (uint32_t)((inendian) ? u16s[u16l] : BSWAP_16(u16s[u16l]));
+
+ if (lo >= UCONV_U16_HI_MIN && lo <= UCONV_U16_HI_MAX) {
+ if (hi)
+ return (EILSEQ);
+ hi = lo;
+ continue;
+ } else if (lo >= UCONV_U16_LO_MIN && lo <= UCONV_U16_LO_MAX) {
+ if (! hi)
+ return (EILSEQ);
+ lo = (((hi - UCONV_U16_HI_MIN) * UCONV_U16_BIT_SHIFT +
+ lo - UCONV_U16_LO_MIN) & UCONV_U16_BIT_MASK)
+ + UCONV_U16_START;
+ hi = 0;
+ } else if (hi) {
+ return (EILSEQ);
+ }
+
+ if (u32l >= *utf32len)
+ return (E2BIG);
+
+ u32s[u32l++] = (outendian) ? lo : BSWAP_32(lo);
+ }
+
+ /*
+ * If high half didn't see low half, then, it's most likely the input
+ * parameter is incomplete.
+ */
+ if (hi)
+ return (EINVAL);
+
+ /*
+ * Save the number of consumed and saved characters. They do not
+ * include terminating NULL character (U+0000) at the end of
+ * the input buffer (even when UCONV_IGNORE_NULL isn't specified and
+ * the input buffer length is big enough to include the terminating
+ * NULL character).
+ */
+ *utf16len = u16l;
+ *utf32len = u32l;
+
+ return (0);
+}
+
+int
+uconv_u16tou8(const uint16_t *u16s, size_t *utf16len,
+ uchar_t *u8s, size_t *utf8len, int flag)
+{
+ int inendian;
+ int outendian;
+ size_t u16l;
+ size_t u8l;
+ uint32_t hi;
+ uint32_t lo;
+ boolean_t do_not_ignore_null;
+
+ if (u16s == NULL || utf16len == NULL)
+ return (EILSEQ);
+
+ if (u8s == NULL || utf8len == NULL)
+ return (E2BIG);
+
+ if (check_endian(flag, &inendian, &outendian) != 0)
+ return (EBADF);
+
+ u16l = u8l = 0;
+ hi = 0;
+ do_not_ignore_null = ((flag & UCONV_IGNORE_NULL) == 0);
+
+ if ((flag & UCONV_IN_ACCEPT_BOM) &&
+ check_bom16(u16s, *utf16len, &inendian))
+ u16l++;
+
+ inendian &= UCONV_IN_NAT_ENDIAN;
+
+ for (; u16l < *utf16len; u16l++) {
+ if (u16s[u16l] == 0 && do_not_ignore_null)
+ break;
+
+ lo = (uint32_t)((inendian) ? u16s[u16l] : BSWAP_16(u16s[u16l]));
+
+ if (lo >= UCONV_U16_HI_MIN && lo <= UCONV_U16_HI_MAX) {
+ if (hi)
+ return (EILSEQ);
+ hi = lo;
+ continue;
+ } else if (lo >= UCONV_U16_LO_MIN && lo <= UCONV_U16_LO_MAX) {
+ if (! hi)
+ return (EILSEQ);
+ lo = (((hi - UCONV_U16_HI_MIN) * UCONV_U16_BIT_SHIFT +
+ lo - UCONV_U16_LO_MIN) & UCONV_U16_BIT_MASK)
+ + UCONV_U16_START;
+ hi = 0;
+ } else if (hi) {
+ return (EILSEQ);
+ }
+
+ /*
+ * Now we convert a UTF-32 character into a UTF-8 character.
+ * Unicode coding space is between U+0000 and U+10FFFF;
+ * anything bigger is an illegal character.
+ */
+ if (lo <= UCONV_U8_ONE_BYTE) {
+ if (u8l >= *utf8len)
+ return (E2BIG);
+ u8s[u8l++] = (uchar_t)lo;
+ } else if (lo <= UCONV_U8_TWO_BYTES) {
+ if ((u8l + 1) >= *utf8len)
+ return (E2BIG);
+ u8s[u8l++] = (uchar_t)(0xc0 | ((lo & 0x07c0) >> 6));
+ u8s[u8l++] = (uchar_t)(0x80 | (lo & 0x003f));
+ } else if (lo <= UCONV_U8_THREE_BYTES) {
+ if ((u8l + 2) >= *utf8len)
+ return (E2BIG);
+ u8s[u8l++] = (uchar_t)(0xe0 | ((lo & 0x0f000) >> 12));
+ u8s[u8l++] = (uchar_t)(0x80 | ((lo & 0x00fc0) >> 6));
+ u8s[u8l++] = (uchar_t)(0x80 | (lo & 0x0003f));
+ } else if (lo <= UCONV_U8_FOUR_BYTES) {
+ if ((u8l + 3) >= *utf8len)
+ return (E2BIG);
+ u8s[u8l++] = (uchar_t)(0xf0 | ((lo & 0x01c0000) >> 18));
+ u8s[u8l++] = (uchar_t)(0x80 | ((lo & 0x003f000) >> 12));
+ u8s[u8l++] = (uchar_t)(0x80 | ((lo & 0x0000fc0) >> 6));
+ u8s[u8l++] = (uchar_t)(0x80 | (lo & 0x000003f));
+ } else {
+ return (EILSEQ);
+ }
+ }
+
+ if (hi)
+ return (EINVAL);
+
+ *utf16len = u16l;
+ *utf8len = u8l;
+
+ return (0);
+}
+
+int
+uconv_u32tou16(const uint32_t *u32s, size_t *utf32len,
+ uint16_t *u16s, size_t *utf16len, int flag)
+{
+ int inendian;
+ int outendian;
+ size_t u16l;
+ size_t u32l;
+ uint32_t hi;
+ uint32_t lo;
+ boolean_t do_not_ignore_null;
+
+ if (u32s == NULL || utf32len == NULL)
+ return (EILSEQ);
+
+ if (u16s == NULL || utf16len == NULL)
+ return (E2BIG);
+
+ if (check_endian(flag, &inendian, &outendian) != 0)
+ return (EBADF);
+
+ u16l = u32l = 0;
+ do_not_ignore_null = ((flag & UCONV_IGNORE_NULL) == 0);
+
+ if ((flag & UCONV_IN_ACCEPT_BOM) &&
+ check_bom32(u32s, *utf32len, &inendian))
+ u32l++;
+
+ inendian &= UCONV_IN_NAT_ENDIAN;
+ outendian &= UCONV_OUT_NAT_ENDIAN;
+
+ if (*utf32len > 0 && *utf16len > 0 && (flag & UCONV_OUT_EMIT_BOM))
+ u16s[u16l++] = (outendian) ? UCONV_BOM_NORMAL :
+ UCONV_BOM_SWAPPED;
+
+ for (; u32l < *utf32len; u32l++) {
+ if (u32s[u32l] == 0 && do_not_ignore_null)
+ break;
+
+ hi = (inendian) ? u32s[u32l] : BSWAP_32(u32s[u32l]);
+
+ /*
+ * Anything bigger than the Unicode coding space, i.e.,
+ * Unicode scalar value bigger than U+10FFFF, is an illegal
+ * character.
+ */
+ if (hi > UCONV_UNICODE_MAX)
+ return (EILSEQ);
+
+ /*
+ * Anything bigger than U+FFFF must be converted into
+ * a surrogate pair in UTF-16.
+ */
+ if (hi >= UCONV_U16_START) {
+ lo = ((hi - UCONV_U16_START) % UCONV_U16_BIT_SHIFT) +
+ UCONV_U16_LO_MIN;
+ hi = ((hi - UCONV_U16_START) / UCONV_U16_BIT_SHIFT) +
+ UCONV_U16_HI_MIN;
+
+ if ((u16l + 1) >= *utf16len)
+ return (E2BIG);
+
+ if (outendian) {
+ u16s[u16l++] = (uint16_t)hi;
+ u16s[u16l++] = (uint16_t)lo;
+ } else {
+ u16s[u16l++] = BSWAP_16(((uint16_t)hi));
+ u16s[u16l++] = BSWAP_16(((uint16_t)lo));
+ }
+ } else {
+ if (u16l >= *utf16len)
+ return (E2BIG);
+ u16s[u16l++] = (outendian) ? (uint16_t)hi :
+ BSWAP_16(((uint16_t)hi));
+ }
+ }
+
+ *utf16len = u16l;
+ *utf32len = u32l;
+
+ return (0);
+}
+
+int
+uconv_u32tou8(const uint32_t *u32s, size_t *utf32len,
+ uchar_t *u8s, size_t *utf8len, int flag)
+{
+ int inendian;
+ int outendian;
+ size_t u32l;
+ size_t u8l;
+ uint32_t lo;
+ boolean_t do_not_ignore_null;
+
+ if (u32s == NULL || utf32len == NULL)
+ return (EILSEQ);
+
+ if (u8s == NULL || utf8len == NULL)
+ return (E2BIG);
+
+ if (check_endian(flag, &inendian, &outendian) != 0)
+ return (EBADF);
+
+ u32l = u8l = 0;
+ do_not_ignore_null = ((flag & UCONV_IGNORE_NULL) == 0);
+
+ if ((flag & UCONV_IN_ACCEPT_BOM) &&
+ check_bom32(u32s, *utf32len, &inendian))
+ u32l++;
+
+ inendian &= UCONV_IN_NAT_ENDIAN;
+
+ for (; u32l < *utf32len; u32l++) {
+ if (u32s[u32l] == 0 && do_not_ignore_null)
+ break;
+
+ lo = (inendian) ? u32s[u32l] : BSWAP_32(u32s[u32l]);
+
+ if (lo <= UCONV_U8_ONE_BYTE) {
+ if (u8l >= *utf8len)
+ return (E2BIG);
+ u8s[u8l++] = (uchar_t)lo;
+ } else if (lo <= UCONV_U8_TWO_BYTES) {
+ if ((u8l + 1) >= *utf8len)
+ return (E2BIG);
+ u8s[u8l++] = (uchar_t)(0xc0 | ((lo & 0x07c0) >> 6));
+ u8s[u8l++] = (uchar_t)(0x80 | (lo & 0x003f));
+ } else if (lo <= UCONV_U8_THREE_BYTES) {
+ if ((u8l + 2) >= *utf8len)
+ return (E2BIG);
+ u8s[u8l++] = (uchar_t)(0xe0 | ((lo & 0x0f000) >> 12));
+ u8s[u8l++] = (uchar_t)(0x80 | ((lo & 0x00fc0) >> 6));
+ u8s[u8l++] = (uchar_t)(0x80 | (lo & 0x0003f));
+ } else if (lo <= UCONV_U8_FOUR_BYTES) {
+ if ((u8l + 3) >= *utf8len)
+ return (E2BIG);
+ u8s[u8l++] = (uchar_t)(0xf0 | ((lo & 0x01c0000) >> 18));
+ u8s[u8l++] = (uchar_t)(0x80 | ((lo & 0x003f000) >> 12));
+ u8s[u8l++] = (uchar_t)(0x80 | ((lo & 0x0000fc0) >> 6));
+ u8s[u8l++] = (uchar_t)(0x80 | (lo & 0x000003f));
+ } else {
+ return (EILSEQ);
+ }
+ }
+
+ *utf32len = u32l;
+ *utf8len = u8l;
+
+ return (0);
+}
+
+int
+uconv_u8tou16(const uchar_t *u8s, size_t *utf8len,
+ uint16_t *u16s, size_t *utf16len, int flag)
+{
+ int inendian;
+ int outendian;
+ size_t u16l;
+ size_t u8l;
+ uint32_t hi;
+ uint32_t lo;
+ int remaining_bytes;
+ int first_b;
+ boolean_t do_not_ignore_null;
+
+ if (u8s == NULL || utf8len == NULL)
+ return (EILSEQ);
+
+ if (u16s == NULL || utf16len == NULL)
+ return (E2BIG);
+
+ if (check_endian(flag, &inendian, &outendian) != 0)
+ return (EBADF);
+
+ u16l = u8l = 0;
+ do_not_ignore_null = ((flag & UCONV_IGNORE_NULL) == 0);
+
+ outendian &= UCONV_OUT_NAT_ENDIAN;
+
+ if (*utf8len > 0 && *utf16len > 0 && (flag & UCONV_OUT_EMIT_BOM))
+ u16s[u16l++] = (outendian) ? UCONV_BOM_NORMAL :
+ UCONV_BOM_SWAPPED;
+
+ for (; u8l < *utf8len; ) {
+ if (u8s[u8l] == 0 && do_not_ignore_null)
+ break;
+
+ /*
+ * Collect a UTF-8 character and convert it to a UTF-32
+ * character. In doing so, we screen out illegally formed
+ * UTF-8 characters and treat such as illegal characters.
+ * The algorithm at below also screens out anything bigger
+ * than the U+10FFFF.
+ *
+ * See Unicode 3.1 UTF-8 Corrigendum and Unicode 3.2 for
+ * more details on the illegal values of UTF-8 character
+ * bytes.
+ */
+ hi = (uint32_t)u8s[u8l++];
+
+ if (hi > UCONV_ASCII_MAX) {
+ if ((remaining_bytes = remaining_bytes_tbl[hi]) == 0)
+ return (EILSEQ);
+
+ first_b = hi;
+ hi = hi & u8_masks_tbl[remaining_bytes];
+
+ for (; remaining_bytes > 0; remaining_bytes--) {
+ /*
+ * If we have no more bytes, the current
+ * UTF-8 character is incomplete.
+ */
+ if (u8l >= *utf8len)
+ return (EINVAL);
+
+ lo = (uint32_t)u8s[u8l++];
+
+ if (first_b) {
+ if (lo < valid_min_2nd_byte[first_b] ||
+ lo > valid_max_2nd_byte[first_b])
+ return (EILSEQ);
+ first_b = 0;
+ } else if (lo < UCONV_U8_BYTE_MIN ||
+ lo > UCONV_U8_BYTE_MAX) {
+ return (EILSEQ);
+ }
+ hi = (hi << UCONV_U8_BIT_SHIFT) |
+ (lo & UCONV_U8_BIT_MASK);
+ }
+ }
+
+ if (hi >= UCONV_U16_START) {
+ lo = ((hi - UCONV_U16_START) % UCONV_U16_BIT_SHIFT) +
+ UCONV_U16_LO_MIN;
+ hi = ((hi - UCONV_U16_START) / UCONV_U16_BIT_SHIFT) +
+ UCONV_U16_HI_MIN;
+
+ if ((u16l + 1) >= *utf16len)
+ return (E2BIG);
+
+ if (outendian) {
+ u16s[u16l++] = (uint16_t)hi;
+ u16s[u16l++] = (uint16_t)lo;
+ } else {
+ u16s[u16l++] = BSWAP_16(((uint16_t)hi));
+ u16s[u16l++] = BSWAP_16(((uint16_t)lo));
+ }
+ } else {
+ if (u16l >= *utf16len)
+ return (E2BIG);
+
+ u16s[u16l++] = (outendian) ? (uint16_t)hi :
+ BSWAP_16(((uint16_t)hi));
+ }
+ }
+
+ *utf16len = u16l;
+ *utf8len = u8l;
+
+ return (0);
+}
+
+int
+uconv_u8tou32(const uchar_t *u8s, size_t *utf8len,
+ uint32_t *u32s, size_t *utf32len, int flag)
+{
+ int inendian;
+ int outendian;
+ size_t u32l;
+ size_t u8l;
+ uint32_t hi;
+ uint32_t c;
+ int remaining_bytes;
+ int first_b;
+ boolean_t do_not_ignore_null;
+
+ if (u8s == NULL || utf8len == NULL)
+ return (EILSEQ);
+
+ if (u32s == NULL || utf32len == NULL)
+ return (E2BIG);
+
+ if (check_endian(flag, &inendian, &outendian) != 0)
+ return (EBADF);
+
+ u32l = u8l = 0;
+ do_not_ignore_null = ((flag & UCONV_IGNORE_NULL) == 0);
+
+ outendian &= UCONV_OUT_NAT_ENDIAN;
+
+ if (*utf8len > 0 && *utf32len > 0 && (flag & UCONV_OUT_EMIT_BOM))
+ u32s[u32l++] = (outendian) ? UCONV_BOM_NORMAL :
+ UCONV_BOM_SWAPPED_32;
+
+ for (; u8l < *utf8len; ) {
+ if (u8s[u8l] == 0 && do_not_ignore_null)
+ break;
+
+ hi = (uint32_t)u8s[u8l++];
+
+ if (hi > UCONV_ASCII_MAX) {
+ if ((remaining_bytes = remaining_bytes_tbl[hi]) == 0)
+ return (EILSEQ);
+
+ first_b = hi;
+ hi = hi & u8_masks_tbl[remaining_bytes];
+
+ for (; remaining_bytes > 0; remaining_bytes--) {
+ if (u8l >= *utf8len)
+ return (EINVAL);
+
+ c = (uint32_t)u8s[u8l++];
+
+ if (first_b) {
+ if (c < valid_min_2nd_byte[first_b] ||
+ c > valid_max_2nd_byte[first_b])
+ return (EILSEQ);
+ first_b = 0;
+ } else if (c < UCONV_U8_BYTE_MIN ||
+ c > UCONV_U8_BYTE_MAX) {
+ return (EILSEQ);
+ }
+ hi = (hi << UCONV_U8_BIT_SHIFT) |
+ (c & UCONV_U8_BIT_MASK);
+ }
+ }
+
+ if (u32l >= *utf32len)
+ return (E2BIG);
+
+ u32s[u32l++] = (outendian) ? hi : BSWAP_32(hi);
+ }
+
+ *utf32len = u32l;
+ *utf8len = u8l;
+
+ return (0);
+}
+
+#if defined(_KERNEL)
+EXPORT_SYMBOL(uconv_u16tou32);
+EXPORT_SYMBOL(uconv_u16tou8);
+EXPORT_SYMBOL(uconv_u32tou16);
+EXPORT_SYMBOL(uconv_u32tou8);
+EXPORT_SYMBOL(uconv_u8tou16);
+EXPORT_SYMBOL(uconv_u8tou32);
+#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-20 02:25:50 +0000