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author | Manuel Bentele | 2020-10-23 15:18:01 +0200 |
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committer | Manuel Bentele | 2020-10-23 15:18:01 +0200 |
commit | dbb41ce2b7f309d394054a6bd1e33afd578798a5 (patch) | |
tree | 6a31092063d9f2fb5ac5720ec6759040e793c3d5 /src/utils/lib/encode.c | |
parent | Set Linux kernel version to unknown if it is not detectable (diff) | |
download | xloop-dbb41ce2b7f309d394054a6bd1e33afd578798a5.tar.gz xloop-dbb41ce2b7f309d394054a6bd1e33afd578798a5.tar.xz xloop-dbb41ce2b7f309d394054a6bd1e33afd578798a5.zip |
Move the source code of all xloop components to the common 'src' directory
Diffstat (limited to 'src/utils/lib/encode.c')
-rw-r--r-- | src/utils/lib/encode.c | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/src/utils/lib/encode.c b/src/utils/lib/encode.c new file mode 100644 index 0000000..10b5971 --- /dev/null +++ b/src/utils/lib/encode.c @@ -0,0 +1,79 @@ +/* + * Based on code from libblkid, + * + * Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org> + * Copyright (C) 2009 Karel Zak <kzak@redhat.com> + * Copyright (C) 2020 Pali Rohár <pali.rohar@gmail.com> + * + * 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; +} |