From 378c18e5f024ac5a8aef4cb40d7c9aa9633d144c Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 16:30:35 +0200 Subject: Adding upstream version 2.38.1. Signed-off-by: Daniel Baumann --- lib/encode.c | 79 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) create mode 100644 lib/encode.c (limited to 'lib/encode.c') diff --git a/lib/encode.c b/lib/encode.c new file mode 100644 index 0000000..10b5971 --- /dev/null +++ b/lib/encode.c @@ -0,0 +1,79 @@ +/* + * Based on code from libblkid, + * + * Copyright (C) 2008 Kay Sievers + * Copyright (C) 2009 Karel Zak + * Copyright (C) 2020 Pali Rohár + * + * This file may be redistributed under the terms of the + * GNU Lesser General Public License. + */ +#include "c.h" +#include "encode.h" + +size_t ul_encode_to_utf8(int enc, unsigned char *dest, size_t len, + const unsigned char *src, size_t count) +{ + size_t i, j; + uint32_t c; + uint16_t c2; + + for (j = i = 0; i < count; i++) { + if (enc == UL_ENCODE_UTF16LE) { + if (i+2 > count) + break; + c = (src[i+1] << 8) | src[i]; + i++; + } else if (enc == UL_ENCODE_UTF16BE) { + if (i+2 > count) + break; + c = (src[i] << 8) | src[i+1]; + i++; + } else if (enc == UL_ENCODE_LATIN1) { + c = src[i]; + } else { + return 0; + } + if ((enc == UL_ENCODE_UTF16LE || enc == UL_ENCODE_UTF16BE) && + c >= 0xD800 && c <= 0xDBFF && i+2 < count) { + if (enc == UL_ENCODE_UTF16LE) + c2 = (src[i+2] << 8) | src[i+1]; + else + c2 = (src[i+1] << 8) | src[i+2]; + if (c2 >= 0xDC00 && c2 <= 0xDFFF) { + c = 0x10000 + ((c - 0xD800) << 10) + (c2 - 0xDC00); + i += 2; + } + } + if (c == 0) { + dest[j] = '\0'; + break; + } + + if (c < 0x80) { + if (j+1 >= len) + break; + dest[j++] = (uint8_t) c; + } else if (c < 0x800) { + if (j+2 >= len) + break; + dest[j++] = (uint8_t) (0xc0 | (c >> 6)); + dest[j++] = (uint8_t) (0x80 | (c & 0x3f)); + } else if (c < 0x10000) { + if (j+3 >= len) + break; + dest[j++] = (uint8_t) (0xe0 | (c >> 12)); + dest[j++] = (uint8_t) (0x80 | ((c >> 6) & 0x3f)); + dest[j++] = (uint8_t) (0x80 | (c & 0x3f)); + } else { + if (j+4 >= len) + break; + dest[j++] = (uint8_t) (0xf0 | (c >> 18)); + dest[j++] = (uint8_t) (0x80 | ((c >> 12) & 0x3f)); + dest[j++] = (uint8_t) (0x80 | ((c >> 6) & 0x3f)); + dest[j++] = (uint8_t) (0x80 | (c & 0x3f)); + } + } + dest[j] = '\0'; + return j; +} -- cgit v1.2.3