Diff: spxml/spxmlcodec.cpp

Revision:

4:7dae52cf560f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spxml/spxmlcodec.cpp	Mon Aug 20 13:27:17 2012 +0000
@@ -0,0 +1,175 @@
+/*
+ * Copyright 2007 Stephen Liu
+ * For license terms, see the file COPYING along with this library.
+ */
+
+#include <string.h>
+#include <stdlib.h>
+#include <ctype.h>
+
+#include "spxmlcodec.hpp"
+#include "spxmlutils.hpp"
+
+const char * SP_XmlStringCodec :: DEFAULT_ENCODING = "utf-8";
+
+const char SP_XmlStringCodec :: XML_CHARS [] =
+		{ '<', '>', '&', '\'', '"' };
+const char * SP_XmlStringCodec :: ESC_CHARS [] =
+		{ "&lt;", "&gt;", "&amp;", "&apos;", "&quot;" };
+
+int SP_XmlStringCodec :: decode( const char * encoding, const char * encodeValue,
+		SP_XmlStringBuffer * outBuffer )
+{
+	int isUtf8 = ( 0 == strcasecmp( encoding, "utf-8" ) );
+
+	const char * pos = encodeValue;
+	for( ; '\0' != *pos; ) {
+		if( '&' == *pos ) {
+			int index = -1;
+			int len = 0;
+			for( int i = 0; i < (int)( sizeof( ESC_CHARS ) / sizeof( ESC_CHARS[0] ) ); i++ ) {
+				len = strlen( ESC_CHARS[ i ] );
+				if( 0 == strncmp( pos, ESC_CHARS[i], len ) ) {
+					index = i;
+					break;
+				}
+			}
+			if( index >= 0 ) {
+				outBuffer->append( XML_CHARS[ index ] );
+				pos += len;
+			} else {
+				char * next = "";
+				int ch = 0;
+				if( '#' == *( pos + 1 ) ) {
+					if( 'x' == *( pos + 2 ) ) {
+						ch = strtol( pos + 3, &next, 16 );
+					} else {
+						ch = strtol( pos + 2, &next, 10 );
+					}
+				}
+
+				// TODO: fully support xml entity, currently only support unicode entity
+				if( ';' == *next && 0 != ch ) {
+					if( isUtf8 ) {
+						SP_XmlUtf8Codec::uni2utf8( ch, outBuffer );
+					} else {
+						outBuffer->append( ch );
+					}
+					pos = next + 1;
+				} else {
+					outBuffer->append( *pos++ );
+				}
+			}
+		} else {
+			outBuffer->append( *pos++ );
+		}
+	}
+
+	return 0;
+}
+
+int SP_XmlStringCodec :: encode( const char * encoding, const char * decodeValue,
+		SP_XmlStringBuffer * outBuffer )
+{
+	int isUtf8 = ( 0 == strcasecmp( encoding, "utf-8" ) );
+
+	const unsigned char * pos = (unsigned char *)decodeValue;
+	for( ; '\0' != *pos; pos++ ) {
+		int index = -1;
+		for( int i = 0; i < (int)( sizeof( XML_CHARS ) / sizeof( XML_CHARS[0] ) ); i++ ) {
+			if( XML_CHARS[i] == *pos ) {
+				index = i;
+				break;
+			}
+		}
+		if( index >= 0 && '\'' != *pos ) {
+			outBuffer->append( ESC_CHARS[ index ] );
+		} else {
+			if( isUtf8 ) {
+				int ch = 0;
+				int len = SP_XmlUtf8Codec::utf82uni( (unsigned char*)pos, &ch );
+
+				if( len > 0 ) {
+					pos += len - 1;
+
+					char temp[ 32 ] = { 0 };
+					snprintf( temp, sizeof( temp ), "&#%d;", ch );
+					outBuffer->append( temp );
+				} else {
+					outBuffer->append( *pos );
+				}
+			} else {
+				if( *pos < 32 ) {
+					char temp[ 32 ] = { 0 };
+					snprintf( temp, sizeof( temp ), "&#%d;", *pos );
+					outBuffer->append( temp );
+				} else {
+					outBuffer->append( *pos );
+				}
+			}
+		}	
+	}
+
+	return 0;
+}
+
+int SP_XmlStringCodec :: isNameChar( const char * encoding, char c )
+{
+	if( 0 == strcasecmp( encoding, "utf-8" ) ) {
+		return 1;
+	} else {
+		return isalnum(c) || c == ':' || c == '-' || c == '.' || c == '_';
+	}
+}
+
+//=========================================================
+
+int SP_XmlUtf8Codec :: utf82uni( const unsigned char * utf8, int * ch )
+{
+	int len = 0;
+
+	unsigned char c1 = 0, c2 = 0, c3 = 0, c4 = 0;
+
+	if( *utf8 >= 0x80 ) {
+		c1 = *utf8++;
+
+		if( c1 < 0xE0 ) {         // 2 bytes
+			if( '\0' != ( c2 = *utf8 ) ) {
+				*ch = ((c1 & 0x1F) << 6) | (c2 & 0x3F);
+				len = 2;
+			}
+		} else if( c1 < 0xF0 ) {  // 3 bytes
+			if( '\0' != ( c2 = *utf8++ ) && '\0' != ( c3 = *utf8 ) ) {
+				*ch = ((c1 & 0x0F) << 12) | ((c2 & 0x3F) << 6)| (c3 & 0x3F);
+				len = 3;
+			}
+		} else {                     // 4 bytes
+			if( '\0' != ( c2 = *utf8++ ) && '\0' != ( c3 = *utf8++ )
+					&& '\0' != ( c4 = *utf8 ) ) {
+				*ch = ((c1 & 0x07) << 16) | ((c2 & 0x3F) << 12)
+						| ((c3 & 0x3F) << 6) | (c4 & 0x3F);
+				len = 4;
+			}
+		}
+	}
+
+	return len;
+}
+
+void SP_XmlUtf8Codec :: uni2utf8( int ch, SP_XmlStringBuffer * outBuffer )
+{
+	if( ch < 0x80 ) outBuffer->append( ch );
+	else if( ch < 0x800 ) {
+		outBuffer->append( 0xC0 | ( ch >> 6 ) );
+		outBuffer->append( 0x80 | ( ch & 0x3F ) );
+	} else if( ch < 0x10000 ) {
+		outBuffer->append( 0xE0 | ( ch >> 12 ) );
+		outBuffer->append( 0x80 | ( ( ch >> 6 ) & 0x3F ) );
+		outBuffer->append( 0x80 | ( ch & 0x3F ) );
+	} else if( ch < 0x200000 ) {
+		outBuffer->append( 0xF0 | ( ch >> 18 ) );
+		outBuffer->append( 0x80 | ( ( ch >> 12 ) & 0x3F ) );
+		outBuffer->append( 0x80 | ( ( ch >> 6 ) & 0x3F ) );
+		outBuffer->append( 0x80 | ( ch & 0x3F ) );
+	}
+}