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Diffstat (limited to 'src/utils/utf16.c')
-rw-r--r-- | src/utils/utf16.c | 239 |
1 files changed, 0 insertions, 239 deletions
diff --git a/src/utils/utf16.c b/src/utils/utf16.c deleted file mode 100644 index 8917328..0000000 --- a/src/utils/utf16.c +++ /dev/null @@ -1,239 +0,0 @@ -/* - * This file is part of Hubbub. - * Licensed under the MIT License, - * http://www.opensource.org/licenses/mit-license.php - * Copyright 2007 John-Mark Bell <jmb@netsurf-browser.org> - */ - -/** \file - * UTF-16 manipulation functions (implementation). - */ - -#include <stdbool.h> -#include <stdlib.h> -#include <string.h> - -#include "utils/utf16.h" - -/** - * Convert a UTF-16 sequence into a single UCS4 character - * - * \param s The sequence to process - * \param len Length of sequence - * \param ucs4 Pointer to location to receive UCS4 character (host endian) - * \param clen Pointer to location to receive byte length of UTF-16 sequence - * \return CHARSET_OK on success, appropriate error otherwise - */ -inline charset_error _dom_utf16_to_ucs4(const uint8_t *s, size_t len, - uint32_t *ucs4, size_t *clen) -{ - const uint16_t *ss = (const uint16_t *) (const void *) s; - - if (s == NULL || ucs4 == NULL || clen == NULL) - return CHARSET_BADPARM; - - if (len < 2) - return CHARSET_NEEDDATA; - - if (*ss < 0xD800 || *ss > 0xDFFF) { - *ucs4 = *ss; - *clen = 2; - } else if (0xD800 <= *ss && *ss <= 0xBFFF) { - if (len < 4) - return CHARSET_NEEDDATA; - - if (0xDC00 <= ss[1] && ss[1] <= 0xE000) { - *ucs4 = (((s[0] >> 6) & 0x1f) + 1) | - ((s[0] & 0x3f) | (s[1] & 0x3ff)); - *clen = 4; - } else { - return CHARSET_INVALID; - } - } - - return CHARSET_OK; -} - -/** - * Convert a single UCS4 character into a UTF-16 sequence - * - * \param ucs4 The character to process (0 <= c <= 0x7FFFFFFF) (host endian) - * \param s Pointer to 4 byte long output buffer - * \param len Pointer to location to receive length of multibyte sequence - * \return CHARSET_OK on success, appropriate error otherwise - */ -inline charset_error _dom_utf16_from_ucs4(uint32_t ucs4, uint8_t *s, - size_t *len) -{ - uint16_t *ss = (uint16_t *) (void *) s; - uint32_t l = 0; - - if (s == NULL || len == NULL) - return CHARSET_BADPARM; - else if (ucs4 < 0x10000) { - *ss = (uint16_t) ucs4; - l = 2; - } else if (ucs4 < 0x110000) { - ss[0] = 0xD800 | (((ucs4 >> 16) & 0x1f) - 1) | (ucs4 >> 10); - ss[1] = 0xDC00 | (ucs4 & 0x3ff); - l = 4; - } else { - return CHARSET_INVALID; - } - - *len = l; - - return CHARSET_OK; -} - -/** - * Calculate the length (in characters) of a bounded UTF-16 string - * - * \param s The string - * \param max Maximum length - * \param len Pointer to location to receive length of string - * \return CHARSET_OK on success, appropriate error otherwise - */ -inline charset_error _dom_utf16_length(const uint8_t *s, size_t max, - size_t *len) -{ - const uint16_t *ss = (const uint16_t *) (const void *) s; - const uint16_t *end = (const uint16_t *) (const void *) (s + max); - int l = 0; - - if (s == NULL || len == NULL) - return CHARSET_BADPARM; - - while (ss < end) { - if (*ss < 0xD800 || 0xDFFF < *ss) - ss++; - else - ss += 2; - - l++; - } - - *len = l; - - return CHARSET_OK; -} - -/** - * Calculate the length (in bytes) of a UTF-16 character - * - * \param s Pointer to start of character - * \param len Pointer to location to receive length - * \return CHARSET_OK on success, appropriate error otherwise - */ -inline charset_error _dom_utf16_char_byte_length(const uint8_t *s, - size_t *len) -{ - const uint16_t *ss = (const uint16_t *) (const void *) s; - - if (s == NULL || len == NULL) - return CHARSET_BADPARM; - - if (*ss < 0xD800 || 0xDFFF < *ss) - *len = 2; - else - *len = 4; - - return CHARSET_OK; -} - -/** - * Find previous legal UTF-16 char in string - * - * \param s The string - * \param off Offset in the string to start at - * \param prevoff Pointer to location to receive offset of first byte of - * previous legal character - * \return CHARSET_OK on success, appropriate error otherwise - */ -inline charset_error _dom_utf16_prev(const uint8_t *s, uint32_t off, - uint32_t *prevoff) -{ - const uint16_t *ss = (const uint16_t *) (const void *) s; - - if (s == NULL || prevoff == NULL) - return CHARSET_BADPARM; - - if (off < 2) - *prevoff = 0; - else if (ss[-1] < 0xDC00 || ss[-1] > 0xDFFF) - *prevoff = off - 2; - else - *prevoff = (off < 4) ? 0 : off - 4; - - return CHARSET_OK; -} - -/** - * Find next legal UTF-16 char in string - * - * \param s The string (assumed valid) - * \param len Maximum offset in string - * \param off Offset in the string to start at - * \param nextoff Pointer to location to receive offset of first byte of - * next legal character - * \return CHARSET_OK on success, appropriate error otherwise - */ -inline charset_error _dom_utf16_next(const uint8_t *s, uint32_t len, - uint32_t off, uint32_t *nextoff) -{ - const uint16_t *ss = (const uint16_t *) (const void *) s; - - if (s == NULL || off >= len || nextoff == NULL) - return CHARSET_BADPARM; - - if (len - off < 4) - *nextoff = len; - else if (ss[1] < 0xD800 || ss[1] > 0xDBFF) - *nextoff = off + 2; - else - *nextoff = (len - off < 6) ? len : off + 4; - - return CHARSET_OK; -} - -/** - * Find next legal UTF-16 char in string - * - * \param s The string (assumed to be of dubious validity) - * \param len Maximum offset in string - * \param off Offset in the string to start at - * \param nextoff Pointer to location to receive offset of first byte of - * next legal character - * \return CHARSET_OK on success, appropriate error otherwise - */ -inline charset_error _dom_utf16_next_paranoid(const uint8_t *s, - uint32_t len, uint32_t off, uint32_t *nextoff) -{ - const uint16_t *ss = (const uint16_t *) (const void *) s; - - if (s == NULL || off >= len || nextoff == NULL) - return CHARSET_BADPARM; - - while (1) { - if (len - off < 4) { - return CHARSET_NEEDDATA; - } else if (ss[1] < 0xD800 || ss[1] > 0xDFFF) { - *nextoff = off + 2; - break; - } else if (ss[1] >= 0xD800 && ss[1] <= 0xDBFF) { - if (len - off < 6) - return CHARSET_NEEDDATA; - - if (ss[2] >= 0xDC00 && ss[2] <= 0xDFFF) { - *nextoff = off + 4; - break; - } else { - ss++; - off += 2; - } - } - } - - return CHARSET_OK; -} - |