diff options
Diffstat (limited to 'src/polyp')
| -rw-r--r-- | src/polyp/utf8.c | 164 | ||||
| -rw-r--r-- | src/polyp/utf8.h | 28 |
2 files changed, 192 insertions, 0 deletions
diff --git a/src/polyp/utf8.c b/src/polyp/utf8.c new file mode 100644 index 00000000..bb8621e2 --- /dev/null +++ b/src/polyp/utf8.c @@ -0,0 +1,164 @@ +/* $Id */ + +/* This file is based on the GLIB utf8 validation functions. The + * original license text follows. */ + +/* gutf8.c - Operations on UTF-8 strings. + * + * Copyright (C) 1999 Tom Tromey + * Copyright (C) 2000 Red Hat, Inc. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <assert.h> +#include <stdlib.h> +#include <inttypes.h> +#include <string.h> + +#include "utf8.h" +#include "xmalloc.h" + +#define FILTER_CHAR '_' + +static inline int is_unicode_valid(uint32_t ch) { + if (ch >= 0x110000) /* End of unicode space */ + return 0; + if ((ch & 0xFFFFF800) == 0xD800) /* Reserved area for UTF-16 */ + return 0; + if ((ch >= 0xFDD0) && (ch <= 0xFDEF)) /* Reserved */ + return 0; + if ((ch & 0xFFFE) == 0xFFFE) /* BOM (Byte Order Mark) */ + return 0; + return 1; +} + +static inline int is_continuation_char(uint8_t ch) { + if ((ch & 0xc0) != 0x80) /* 10xxxxxx */ + return 0; + return 1; +} + +static inline void merge_continuation_char(uint32_t *u_ch, uint8_t ch) { + *u_ch <<= 6; + *u_ch |= ch & 0x3f; +} + +static char* utf8_validate(const char *str, char *output) { + uint32_t val = 0; + uint32_t min = 0; + const uint8_t *p, *last; + int size; + uint8_t *o; + + o = (uint8_t*) output; + for (p = (const uint8_t*) str; *p; p++) { + if (*p < 128) { + if (o) + *o = *p; + } else { + last = p; + + if ((*p & 0xe0) == 0xc0) { /* 110xxxxx two-char seq. */ + size = 2; + min = 128; + val = *p & 0x1e; + goto ONE_REMAINING; + } else if ((*p & 0xf0) == 0xe0) { /* 1110xxxx three-char seq.*/ + size = 3; + min = (1 << 11); + val = *p & 0x0f; + goto TWO_REMAINING; + } else if ((*p & 0xf8) == 0xf0) { /* 11110xxx four-char seq */ + size = 4; + min = (1 << 16); + val = *p & 0x07; + } else { + size = 1; + goto error; + } + + p++; + if (!is_continuation_char(*p)) + goto error; + merge_continuation_char(&val, *p); + +TWO_REMAINING: + p++; + if (!is_continuation_char(*p)) + goto error; + merge_continuation_char(&val, *p); + +ONE_REMAINING: + p++; + if (!is_continuation_char(*p)) + goto error; + merge_continuation_char(&val, *p); + + if (val < min) + goto error; + + if (!is_unicode_valid(val)) + goto error; + + if (o) { + memcpy(o, last, size); + o += size - 1; + } + + if (o) + o++; + + continue; + +error: + if (o) { + *o = FILTER_CHAR; + p = last; /* We retry at the next character */ + } else + goto failure; + } + + if (o) + o++; + } + + if (o) { + *o = '\0'; + return output; + } + + return (char*) str; + +failure: + return NULL; +} + +const char* pa_utf8_valid (const char *str) { + return utf8_validate(str, NULL); +} + +char* pa_utf8_filter (const char *str) { + char *new_str; + + new_str = pa_xnew(char, strlen(str) + 1); + + return utf8_validate(str, new_str); +} diff --git a/src/polyp/utf8.h b/src/polyp/utf8.h new file mode 100644 index 00000000..6d1e4a7d --- /dev/null +++ b/src/polyp/utf8.h @@ -0,0 +1,28 @@ +#ifndef fooutf8hfoo +#define fooutf8hfoo + +/* $Id$ */ + +/*** + This file is part of polypaudio. + + polypaudio is free software; you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of the + License, or (at your option) any later version. + + polypaudio is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with polypaudio; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 + USA. +***/ + +const char *pa_utf8_valid(const char *str); +char *pa_utf8_filter(const char *str); + +#endif |