r799 - trunk
DONOTREPLY at icculus.org
DONOTREPLY at icculus.org
Sun Nov 5 06:32:18 EST 2006
Author: icculus
Date: 2006-11-05 06:32:18 -0500 (Sun, 05 Nov 2006)
New Revision: 799
Added:
trunk/physfs_unicode.c
Log:
Initial add.
Added: trunk/physfs_unicode.c
===================================================================
--- trunk/physfs_unicode.c (rev 0)
+++ trunk/physfs_unicode.c 2006-11-05 11:32:18 UTC (rev 799)
@@ -0,0 +1,338 @@
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "physfs.h"
+
+#define __PHYSICSFS_INTERNAL__
+#include "physfs_internal.h"
+
+
+/*
+ * From rfc3629, the UTF-8 spec:
+ * http://www.ietf.org/rfc/rfc3629.txt
+ *
+ * Char. number range | UTF-8 octet sequence
+ * (hexadecimal) | (binary)
+ * --------------------+---------------------------------------------
+ * 0000 0000-0000 007F | 0xxxxxxx
+ * 0000 0080-0000 07FF | 110xxxxx 10xxxxxx
+ * 0000 0800-0000 FFFF | 1110xxxx 10xxxxxx 10xxxxxx
+ * 0001 0000-0010 FFFF | 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
+ */
+
+
+/*
+ * This may not be the best value, but it's one that isn't represented
+ * in Unicode (0x10FFFF is the largest codepoint value). We return this
+ * value from utf8codepoint() if there's bogus bits in the
+ * stream. utf8codepoint() will turn this value into something
+ * reasonable (like a question mark), for text that wants to try to recover,
+ * whereas utf8valid() will use the value to determine if a string has bad
+ * bits.
+ */
+#define UNICODE_BOGUS_CHAR_VALUE 0xFFFFFFFF
+
+/*
+ * This is the codepoint we currently return when there was bogus bits in a
+ * UTF-8 string. May not fly in Asian locales?
+ */
+#define UNICODE_BOGUS_CHAR_CODEPOINT '?'
+
+static PHYSFS_uint32 utf8codepoint(const char **_str)
+{
+ const char *str = *_str;
+ PHYSFS_uint32 retval = 0;
+ PHYSFS_uint32 octet = (PHYSFS_uint32) ((PHYSFS_uint8) *str);
+ PHYSFS_uint32 octet2, octet3, octet4;
+
+ if (octet == 0) /* null terminator, end of string. */
+ return 0;
+
+ else if (octet < 128) /* one octet char: 0 to 127 */
+ {
+ (*_str)++; /* skip to next possible start of codepoint. */
+ return(octet);
+ } /* else if */
+
+ else if ((octet > 127) && (octet < 192)) /* bad (starts with 10xxxxxx). */
+ {
+ /*
+ * Apparently each of these is supposed to be flagged as a bogus
+ * char, instead of just resyncing to the next valid codepoint.
+ */
+ (*_str)++; /* skip to next possible start of codepoint. */
+ return UNICODE_BOGUS_CHAR_VALUE;
+ } /* else if */
+
+ else if (octet < 224) /* two octets */
+ {
+ octet -= (128+64);
+ octet2 = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
+ if ((octet2 & (128+64)) != 128) /* Format isn't 10xxxxxx? */
+ return UNICODE_BOGUS_CHAR_VALUE;
+
+ *_str += 2; /* skip to next possible start of codepoint. */
+ retval = ((octet << 6) | (octet2 - 128));
+ if ((retval >= 0x80) && (retval <= 0x7FF))
+ return retval;
+ } /* else if */
+
+ else if (octet < 240) /* three octets */
+ {
+ octet -= (128+64+32);
+ octet2 = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
+ if ((octet2 & (128+64)) != 128) /* Format isn't 10xxxxxx? */
+ return UNICODE_BOGUS_CHAR_VALUE;
+
+ octet3 = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
+ if ((octet3 & (128+64)) != 128) /* Format isn't 10xxxxxx? */
+ return UNICODE_BOGUS_CHAR_VALUE;
+
+ *_str += 3; /* skip to next possible start of codepoint. */
+ retval = ( ((octet << 12)) | ((octet2-128) << 6) | ((octet3-128)) );
+
+ /* There are seven "UTF-16 surrogates" that are illegal in UTF-8. */
+ switch (retval)
+ {
+ case 0xD800:
+ case 0xDB7F:
+ case 0xDB80:
+ case 0xDBFF:
+ case 0xDC00:
+ case 0xDF80:
+ case 0xDFFF:
+ return UNICODE_BOGUS_CHAR_VALUE;
+ } /* switch */
+
+ /* 0xFFFE and 0xFFFF are illegal, too, so we check them at the edge. */
+ if ((retval >= 0x800) && (retval <= 0xFFFD))
+ return retval;
+ } /* else if */
+
+ else if (octet < 248) /* four octets */
+ {
+ octet -= (128+64+32+16);
+ octet2 = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
+ if ((octet2 & (128+64)) != 128) /* Format isn't 10xxxxxx? */
+ return UNICODE_BOGUS_CHAR_VALUE;
+
+ octet3 = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
+ if ((octet3 & (128+64)) != 128) /* Format isn't 10xxxxxx? */
+ return UNICODE_BOGUS_CHAR_VALUE;
+
+ octet4 = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
+ if ((octet4 & (128+64)) != 128) /* Format isn't 10xxxxxx? */
+ return UNICODE_BOGUS_CHAR_VALUE;
+
+ *_str += 4; /* skip to next possible start of codepoint. */
+ retval = ( ((octet << 18)) | ((octet2 - 128) << 12) |
+ ((octet3 - 128) << 6) | ((octet4 - 128)) );
+ if ((retval >= 0x10000) && (retval <= 0x10FFFF))
+ return retval;
+ } /* else if */
+
+ /*
+ * Five and six octet sequences became illegal in rfc3629.
+ * We throw the codepoint away, but parse them to make sure we move
+ * ahead the right number of bytes and don't overflow the buffer.
+ */
+
+ else if (octet < 252) /* five octets */
+ {
+ octet = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
+ if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
+ return UNICODE_BOGUS_CHAR_VALUE;
+
+ octet = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
+ if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
+ return UNICODE_BOGUS_CHAR_VALUE;
+
+ octet = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
+ if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
+ return UNICODE_BOGUS_CHAR_VALUE;
+
+ octet = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
+ if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
+ return UNICODE_BOGUS_CHAR_VALUE;
+
+ *_str += 5; /* skip to next possible start of codepoint. */
+ return UNICODE_BOGUS_CHAR_VALUE;
+ } /* else if */
+
+ else /* six octets */
+ {
+ octet = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
+ if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
+ return UNICODE_BOGUS_CHAR_VALUE;
+
+ octet = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
+ if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
+ return UNICODE_BOGUS_CHAR_VALUE;
+
+ octet = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
+ if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
+ return UNICODE_BOGUS_CHAR_VALUE;
+
+ octet = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
+ if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
+ return UNICODE_BOGUS_CHAR_VALUE;
+
+ octet = (PHYSFS_uint32) ((PHYSFS_uint8) *(++str));
+ if ((octet & (128+64)) != 128) /* Format isn't 10xxxxxx? */
+ return UNICODE_BOGUS_CHAR_VALUE;
+
+ *_str += 6; /* skip to next possible start of codepoint. */
+ return UNICODE_BOGUS_CHAR_VALUE;
+ } /* else if */
+
+ return UNICODE_BOGUS_CHAR_VALUE;
+} /* utf8codepoint */
+
+void PHYSFS_utf8toucs4(const char *src, PHYSFS_uint32 *dst, PHYSFS_uint64 len)
+{
+ len -= sizeof (PHYSFS_uint32); /* save room for null char. */
+ while (len >= sizeof (PHYSFS_uint32))
+ {
+ PHYSFS_uint32 cp = utf8codepoint(&src);
+ if (cp == 0)
+ break;
+ else if (cp == UNICODE_BOGUS_CHAR_VALUE)
+ cp = UNICODE_BOGUS_CHAR_CODEPOINT;
+ *(dst++) = cp;
+ len -= sizeof (PHYSFS_uint32);
+ } /* while */
+
+ *dst = 0;
+} /* PHYSFS_utf8toucs4 */
+
+void PHYSFS_utf8toucs2(const char *src, PHYSFS_uint16 *dst, PHYSFS_uint64 len)
+{
+ len -= sizeof (PHYSFS_uint16); /* save room for null char. */
+ while (len >= sizeof (PHYSFS_uint16))
+ {
+ PHYSFS_uint32 cp = utf8codepoint(&src);
+ if (cp == 0)
+ break;
+ else if (cp == UNICODE_BOGUS_CHAR_VALUE)
+ cp = UNICODE_BOGUS_CHAR_CODEPOINT;
+
+ /* !!! BLUESKY: UTF-16 surrogates? */
+ if (cp > 0xFFFF)
+ cp = UNICODE_BOGUS_CHAR_CODEPOINT;
+
+ *(dst++) = cp;
+ len -= sizeof (PHYSFS_uint16);
+ } /* while */
+
+ *dst = 0;
+} /* PHYSFS_utf8toucs2 */
+
+static void utf8fromcodepoint(PHYSFS_uint32 cp, char **_dst, PHYSFS_uint64 *_len)
+{
+ char *dst = *_dst;
+ PHYSFS_uint64 len = *_len;
+
+ if (len == 0)
+ return;
+
+ if (cp > 0x10FFFF)
+ cp = UNICODE_BOGUS_CHAR_CODEPOINT;
+ else if ((cp == 0xFFFE) || (cp == 0xFFFF)) /* illegal values. */
+ cp = UNICODE_BOGUS_CHAR_CODEPOINT;
+ else
+ {
+ /* There are seven "UTF-16 surrogates" that are illegal in UTF-8. */
+ switch (cp)
+ {
+ case 0xD800:
+ case 0xDB7F:
+ case 0xDB80:
+ case 0xDBFF:
+ case 0xDC00:
+ case 0xDF80:
+ case 0xDFFF:
+ cp = UNICODE_BOGUS_CHAR_CODEPOINT;
+ } /* switch */
+ } /* else */
+
+ /* Do the encoding... */
+ if (cp < 0x80)
+ {
+ *(dst++) = (char) cp;
+ len--;
+ } /* if */
+
+ else if (cp < 0x800)
+ {
+ if (len < 2)
+ len = 0;
+ else
+ {
+ *(dst++) = (char) ((cp >> 6) | 128 | 64);
+ *(dst++) = (char) (cp & 0x3F) | 128;
+ len -= 2;
+ } /* else */
+ } /* else if */
+
+ else if (cp < 0x10000)
+ {
+ if (len < 3)
+ len = 0;
+ else
+ {
+ *(dst++) = (char) ((cp >> 12) | 128 | 64 | 32);
+ *(dst++) = (char) ((cp >> 6) & 0x3F) | 128;
+ *(dst++) = (char) (cp & 0x3F) | 128;
+ len -= 3;
+ } /* else */
+ } /* else if */
+
+ else
+ {
+ if (len < 4)
+ len = 0;
+ else
+ {
+ *(dst++) = (char) ((cp >> 18) | 128 | 64 | 32 | 16);
+ *(dst++) = (char) ((cp >> 12) & 0x3F) | 128;
+ *(dst++) = (char) ((cp >> 6) & 0x3F) | 128;
+ *(dst++) = (char) (cp & 0x3F) | 128;
+ len -= 4;
+ } /* else if */
+ } /* else */
+
+ *_dst = dst;
+ *_len = len;
+} /* utf8fromcodepoint */
+
+#define UTF8FROMTYPE(typ, src, dst, len) \
+ len--; \
+ while (len) \
+ { \
+ const PHYSFS_uint32 cp = (PHYSFS_uint32) *(src++); \
+ if (cp == 0) break; \
+ utf8fromcodepoint(cp, &dst, &len); \
+ } \
+ *dst = '\0'; \
+
+void PHYSFS_utf8fromucs4(const PHYSFS_uint32 *src, char *dst, PHYSFS_uint64 len)
+{
+ UTF8FROMTYPE(PHYSFS_uint32, src, dst, len);
+} /* PHYSFS_utf8fromucs4 */
+
+void PHYSFS_utf8fromucs2(const PHYSFS_uint16 *src, char *dst, PHYSFS_uint64 len)
+{
+ UTF8FROMTYPE(PHYSFS_uint64, src, dst, len);
+} /* PHYSFS_utf8fromucs4 */
+
+/* latin1 maps to unicode codepoints directly, we just utf-8 encode it. */
+void PHYSFS_utf8fromlatin1(const char *src, char *dst, PHYSFS_uint64 len)
+{
+ UTF8FROMTYPE(PHYSFS_uint8, src, dst, len);
+} /* PHYSFS_utf8fromlatin1 */
+
+#undef UTF8FROMTYPE
+
+/* end of physfs_unicode.c ... */
+
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