-/*
- * strenc.c: string encoding conversions
+/**
+ * \file
+ * string encoding conversions
*
* Author:
* Dick Porter (dick@ximian.com)
#include "strenc.h"
-#undef DEBUG
+static const char trailingBytesForUTF8[256] = {
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
+ 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 3,3,3,3,3,3,3,3,4,4,4,4,5,5,0,0
+};
/**
* mono_unicode_from_external:
- * @in: pointers to the buffer.
- * @bytes: number of bytes in the string.
- *
- * Tries to turn a NULL-terminated string into UTF16.
+ * \param in pointers to the buffer.
+ * \param bytes number of bytes in the string.
+ * Tries to turn a NULL-terminated string into UTF-16.
*
- * First, see if it's valid UTF8, in which case just turn it directly
- * into UTF16. Next, run through the colon-separated encodings in
- * MONO_EXTERNAL_ENCODINGS and do an iconv conversion on each,
- * returning the first successful conversion to UTF16. If no
+ * First, see if it's valid UTF-8, in which case just turn it directly
+ * into UTF-16. Next, run through the colon-separated encodings in
+ * \c MONO_EXTERNAL_ENCODINGS and do an \c iconv conversion on each,
+ * returning the first successful conversion to UTF-16. If no
* conversion succeeds, return NULL.
*
- * Callers must free the returned string if not NULL. bytes holds the number
+ * Callers must free the returned string if not NULL. \p bytes holds the number
* of bytes in the returned string, not including the terminator.
*/
gunichar2 *
{
gchar *res=NULL;
gchar **encodings;
- const gchar *encoding_list;
+ gchar *encoding_list;
int i;
glong lbytes;
encoding_list=g_getenv ("MONO_EXTERNAL_ENCODINGS");
if(encoding_list==NULL) {
- encoding_list = "";
+ encoding_list = g_strdup("");
}
encodings=g_strsplit (encoding_list, ":", 0);
+ g_free (encoding_list);
for(i=0;encodings[i]!=NULL; i++) {
-#ifdef DEBUG
- g_message (G_GNUC_PRETTY_FUNCTION ": Trying encoding [%s]",
- encodings[i]);
-#endif
/* "default_locale" is a special case encoding */
if(!strcmp (encodings[i], "default_locale")) {
gchar *utf8=g_locale_to_utf8 (in, -1, NULL, NULL, NULL);
/**
* mono_utf8_from_external:
- * @in: pointer to the string buffer.
- *
+ * \param in pointer to the string buffer.
* Tries to turn a NULL-terminated string into UTF8.
*
- * First, see if it's valid UTF8, in which case there's nothing more
+ * First, see if it's valid UTF-8, in which case there's nothing more
* to be done. Next, run through the colon-separated encodings in
- * MONO_EXTERNAL_ENCODINGS and do an iconv conversion on each,
- * returning the first successful conversion to utf8. If no
+ * \c MONO_EXTERNAL_ENCODINGS and do an \c iconv conversion on each,
+ * returning the first successful conversion to UTF-8. If no
* conversion succeeds, return NULL.
*
* Callers must free the returned string if not NULL.
*
- * This function is identical to mono_unicode_from_external, apart
- * from returning utf8 not utf16; it's handy in a few places to work
- * in utf8.
+ * This function is identical to \c mono_unicode_from_external, apart
+ * from returning UTF-8 not UTF-16; it's handy in a few places to work
+ * in UTF-8.
*/
gchar *mono_utf8_from_external (const gchar *in)
{
gchar *res=NULL;
gchar **encodings;
- const gchar *encoding_list;
+ gchar *encoding_list;
int i;
if(in==NULL) {
encoding_list=g_getenv ("MONO_EXTERNAL_ENCODINGS");
if(encoding_list==NULL) {
- encoding_list = "";
+ encoding_list = g_strdup("");
}
encodings=g_strsplit (encoding_list, ":", 0);
+ g_free (encoding_list);
for(i=0;encodings[i]!=NULL; i++) {
-#ifdef DEBUG
- g_message (G_GNUC_PRETTY_FUNCTION ": Trying encoding [%s]",
- encodings[i]);
-#endif
/* "default_locale" is a special case encoding */
if(!strcmp (encodings[i], "default_locale")) {
/**
* mono_unicode_to_external:
- * @uni: an UTF16 string to conver to an external representation.
- *
- * Turns NULL-terminated UTF16 into either UTF8, or the first
- * working item in MONO_EXTERNAL_ENCODINGS if set. If no conversions
- * work, then UTF8 is returned.
- *
+ * \param uni a UTF-16 string to convert to an external representation.
+ * Turns NULL-terminated UTF-16 into either UTF-8, or the first
+ * working item in \c MONO_EXTERNAL_ENCODINGS if set. If no conversions
+ * work, then UTF-8 is returned.
* Callers must free the returned string.
*/
gchar *mono_unicode_to_external (const gunichar2 *uni)
{
gchar *utf8;
- const gchar *encoding_list;
+ gchar *encoding_list;
/* Turn the unicode into utf8 to start with, because its
* easier to work with gchar * than gunichar2 *
int i;
encodings=g_strsplit (encoding_list, ":", 0);
+ g_free (encoding_list);
for(i=0; encodings[i]!=NULL; i++) {
if(!strcmp (encodings[i], "default_locale")) {
res=g_locale_from_utf8 (utf8, -1, NULL, NULL,
return(utf8);
}
+/**
+ * mono_utf8_validate_and_len
+ * \param source Pointer to putative UTF-8 encoded string.
+ * Checks \p source for being valid UTF-8. \p utf is assumed to be
+ * null-terminated.
+ * \returns TRUE if \p source is valid.
+ * \p oEnd will equal the null terminator at the end of the string if valid.
+ * if not valid, it will equal the first charater of the invalid sequence.
+ * \p oLength will equal the length to \p oEnd
+ **/
+gboolean
+mono_utf8_validate_and_len (const gchar *source, glong* oLength, const gchar** oEnd)
+{
+ gboolean retVal = TRUE;
+ gboolean lastRet = TRUE;
+ guchar* ptr = (guchar*) source;
+ guchar* srcPtr;
+ guint length;
+ guchar a;
+ *oLength = 0;
+ while (*ptr != 0) {
+ length = trailingBytesForUTF8 [*ptr] + 1;
+ srcPtr = (guchar*) ptr + length;
+ switch (length) {
+ default: retVal = FALSE;
+ /* Everything else falls through when "TRUE"... */
+ case 4: if ((a = (*--srcPtr)) < (guchar) 0x80 || a > (guchar) 0xBF) retVal = FALSE;
+ if ((a == (guchar) 0xBF || a == (guchar) 0xBE) && *(srcPtr-1) == (guchar) 0xBF) {
+ if (*(srcPtr-2) == (guchar) 0x8F || *(srcPtr-2) == (guchar) 0x9F ||
+ *(srcPtr-2) == (guchar) 0xAF || *(srcPtr-2) == (guchar) 0xBF)
+ retVal = FALSE;
+ }
+ case 3: if ((a = (*--srcPtr)) < (guchar) 0x80 || a > (guchar) 0xBF) retVal = FALSE;
+ case 2: if ((a = (*--srcPtr)) < (guchar) 0x80 || a > (guchar) 0xBF) retVal = FALSE;
+
+ switch (*ptr) {
+ /* no fall-through in this inner switch */
+ case 0xE0: if (a < (guchar) 0xA0) retVal = FALSE; break;
+ case 0xED: if (a > (guchar) 0x9F) retVal = FALSE; break;
+ case 0xEF: if (a == (guchar)0xB7 && (*(srcPtr+1) > (guchar) 0x8F && *(srcPtr+1) < 0xB0)) retVal = FALSE;
+ if (a == (guchar)0xBF && (*(srcPtr+1) == (guchar) 0xBE || *(srcPtr+1) == 0xBF)) retVal = FALSE; break;
+ case 0xF0: if (a < (guchar) 0x90) retVal = FALSE; break;
+ case 0xF4: if (a > (guchar) 0x8F) retVal = FALSE; break;
+ default: if (a < (guchar) 0x80) retVal = FALSE;
+ }
+
+ case 1: if (*ptr >= (guchar ) 0x80 && *ptr < (guchar) 0xC2) retVal = FALSE;
+ }
+ if (*ptr > (guchar) 0xF4)
+ retVal = FALSE;
+ //If the string is invalid, set the end to the invalid byte.
+ if (!retVal && lastRet) {
+ if (oEnd != NULL)
+ *oEnd = (gchar*) ptr;
+ lastRet = FALSE;
+ }
+ ptr += length;
+ (*oLength)++;
+ }
+ if (retVal && oEnd != NULL)
+ *oEnd = (gchar*) ptr;
+ return retVal;
+}
+
+
+/**
+ * mono_utf8_validate_and_len_with_bounds
+ * \param source: Pointer to putative UTF-8 encoded string.
+ * \param max_bytes: Max number of bytes that can be decoded.
+ *
+ * Checks \p source for being valid UTF-8. \p utf is assumed to be
+ * null-terminated.
+ *
+ * This function returns FALSE if it needs to decode characters beyond \p max_bytes.
+ *
+ * \returns TRUE if \p source is valid.
+ * \p oEnd will equal the null terminator at the end of the string if valid.
+ * if not valid, it will equal the first charater of the invalid sequence.
+ * \p oLength will equal the length to \p oEnd
+ **/
+gboolean
+mono_utf8_validate_and_len_with_bounds (const gchar *source, glong max_bytes, glong* oLength, const gchar** oEnd)
+{
+ gboolean retVal = TRUE;
+ gboolean lastRet = TRUE;
+ guchar* ptr = (guchar*) source;
+ guchar *end = ptr + max_bytes;
+ guchar* srcPtr;
+ guint length;
+ guchar a;
+ *oLength = 0;
+
+ if (max_bytes < 1) {
+ if (oEnd)
+ *oEnd = (gchar*) ptr;
+ return FALSE;
+ }
+
+ while (*ptr != 0) {
+ length = trailingBytesForUTF8 [*ptr] + 1;
+ srcPtr = (guchar*) ptr + length;
+
+ /* since *ptr is not zero we must ensure that we can decode the current char + the byte after
+ srcPtr points to the first byte after the current char.*/
+ if (srcPtr >= end) {
+ retVal = FALSE;
+ break;
+ }
+ switch (length) {
+ default: retVal = FALSE;
+ /* Everything else falls through when "TRUE"... */
+ case 4: if ((a = (*--srcPtr)) < (guchar) 0x80 || a > (guchar) 0xBF) retVal = FALSE;
+ if ((a == (guchar) 0xBF || a == (guchar) 0xBE) && *(srcPtr-1) == (guchar) 0xBF) {
+ if (*(srcPtr-2) == (guchar) 0x8F || *(srcPtr-2) == (guchar) 0x9F ||
+ *(srcPtr-2) == (guchar) 0xAF || *(srcPtr-2) == (guchar) 0xBF)
+ retVal = FALSE;
+ }
+ case 3: if ((a = (*--srcPtr)) < (guchar) 0x80 || a > (guchar) 0xBF) retVal = FALSE;
+ case 2: if ((a = (*--srcPtr)) < (guchar) 0x80 || a > (guchar) 0xBF) retVal = FALSE;
+
+ switch (*ptr) {
+ /* no fall-through in this inner switch */
+ case 0xE0: if (a < (guchar) 0xA0) retVal = FALSE; break;
+ case 0xED: if (a > (guchar) 0x9F) retVal = FALSE; break;
+ case 0xEF: if (a == (guchar)0xB7 && (*(srcPtr+1) > (guchar) 0x8F && *(srcPtr+1) < 0xB0)) retVal = FALSE;
+ if (a == (guchar)0xBF && (*(srcPtr+1) == (guchar) 0xBE || *(srcPtr+1) == 0xBF)) retVal = FALSE; break;
+ case 0xF0: if (a < (guchar) 0x90) retVal = FALSE; break;
+ case 0xF4: if (a > (guchar) 0x8F) retVal = FALSE; break;
+ default: if (a < (guchar) 0x80) retVal = FALSE;
+ }
+
+ case 1: if (*ptr >= (guchar ) 0x80 && *ptr < (guchar) 0xC2) retVal = FALSE;
+ }
+ if (*ptr > (guchar) 0xF4)
+ retVal = FALSE;
+ //If the string is invalid, set the end to the invalid byte.
+ if (!retVal && lastRet) {
+ if (oEnd != NULL)
+ *oEnd = (gchar*) ptr;
+ lastRet = FALSE;
+ }
+ ptr += length;
+ (*oLength)++;
+ }
+ if (retVal && oEnd != NULL)
+ *oEnd = (gchar*) ptr;
+ return retVal;
+}
+
projects / mono.git / blobdiff