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https://github.com/owntone/owntone-server.git
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[sqlext] Remove unused sql extension for 'daap_charindex' and
'daap_leftstr'
This commit is contained in:
chme
parent
171e30aead
commit
be873d69c6
269
sqlext/sqlext.c
269
sqlext/sqlext.c
@ -244,257 +244,6 @@ sqlext_daap_unicode_xcollation(void *notused, int llen, const void *left, int rl
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return rpp;
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}
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/* Taken from "extension-functions.c" by Liam Healy (2010-02-06 15:45:07)
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http://www.sqlite.org/contrib/download/extension-functions.c?get=25 */
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/* LMH from sqlite3 3.3.13 */
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/*
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** This table maps from the first byte of a UTF-8 character to the number
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** of trailing bytes expected. A value '4' indicates that the table key
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** is not a legal first byte for a UTF-8 character.
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*/
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static const uint8_t xtra_utf8_bytes[256] = {
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/* 0xxxxxxx */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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/* 10wwwwww */
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4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
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4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
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4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
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4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
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/* 110yyyyy */
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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/* 1110zzzz */
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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/* 11110yyy */
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3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,
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};
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/*
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** This table maps from the number of trailing bytes in a UTF-8 character
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** to an integer constant that is effectively calculated for each character
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** read by a naive implementation of a UTF-8 character reader. The code
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** in the READ_UTF8 macro explains things best.
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*/
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static const int xtra_utf8_bits[] = {
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0,
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12416, /* (0xC0 << 6) + (0x80) */
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925824, /* (0xE0 << 12) + (0x80 << 6) + (0x80) */
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63447168 /* (0xF0 << 18) + (0x80 << 12) + (0x80 << 6) + 0x80 */
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};
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/*
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** If a UTF-8 character contains N bytes extra bytes (N bytes follow
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** the initial byte so that the total character length is N+1) then
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** masking the character with utf8_mask[N] must produce a non-zero
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** result. Otherwise, we have an (illegal) overlong encoding.
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*/
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static const int utf_mask[] = {
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0x00000000,
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0xffffff80,
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0xfffff800,
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0xffff0000,
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};
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/* LMH salvaged from sqlite3 3.3.13 source code src/utf.c */
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#define READ_UTF8(zIn, c) { \
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int xtra; \
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c = *(zIn)++; \
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xtra = xtra_utf8_bytes[c]; \
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switch( xtra ){ \
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case 4: c = (int)0xFFFD; break; \
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case 3: c = (c<<6) + *(zIn)++; \
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case 2: c = (c<<6) + *(zIn)++; \
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case 1: c = (c<<6) + *(zIn)++; \
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c -= xtra_utf8_bits[xtra]; \
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if( (utf_mask[xtra]&c)==0 \
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|| (c&0xFFFFF800)==0xD800 \
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|| (c&0xFFFFFFFE)==0xFFFE ){ c = 0xFFFD; } \
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} \
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}
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static int sqlite3ReadUtf8(const unsigned char *z)
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{
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int c;
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READ_UTF8(z, c);
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return c;
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}
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/*
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* X is a pointer to the first byte of a UTF-8 character. Increment
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* X so that it points to the next character. This only works right
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* if X points to a well-formed UTF-8 string.
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*/
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#define sqliteNextChar(X) while( (0xc0&*++(X))==0x80 ){}
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#define sqliteCharVal(X) sqlite3ReadUtf8(X)
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/*
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* Given a string z1, retutns the (0 based) index of it's first occurence
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* in z2 after the first s characters.
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* Returns -1 when there isn't a match.
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* updates p to point to the character where the match occured.
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* This is an auxiliary function.
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*/
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static int _substr(const char* z1, const char* z2, int s, const char** p)
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{
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int c = 0;
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int rVal = -1;
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const char* zt1;
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const char* zt2;
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int c1, c2;
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if ('\0' == *z1)
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{
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return -1;
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}
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while ((sqliteCharVal((unsigned char *)z2) != 0) && (c++) < s)
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{
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sqliteNextChar(z2);
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}
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c = 0;
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while ((sqliteCharVal((unsigned char * )z2)) != 0)
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{
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zt1 = z1;
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zt2 = z2;
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do
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{
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c1 = sqliteCharVal((unsigned char * )zt1);
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c2 = sqliteCharVal((unsigned char * )zt2);
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sqliteNextChar(zt1);
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sqliteNextChar(zt2);
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} while (c1 == c2 && c1 != 0 && c2 != 0);
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if (c1 == 0)
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{
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rVal = c;
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break;
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}
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sqliteNextChar(z2);
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++c;
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}
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if (p)
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{
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*p = z2;
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}
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return rVal >= 0 ? rVal + s : rVal;
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}
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/*
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* Taken from "extension-functions.c" (function charindexFunc) by Liam Healy (2010-02-06 15:45:07)
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* http://www.sqlite.org/contrib/download/extension-functions.c?get=25
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*
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* Given 2 input strings (s1,s2) and an integer (n) searches from the nth character
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* for the string s1. Returns the position where the match occured.
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* Characters are counted from 1.
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* 0 is returned when no match occurs.
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*/
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static void sqlext_daap_charindex_xfunc(sqlite3_context *context, int argc, sqlite3_value **argv)
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{
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const uint8_t *z1; /* s1 string */
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uint8_t *z2; /* s2 string */
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int s = 0;
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int rVal = 0;
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//assert(argc == 3 || argc == 2);
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if (argc != 2 && argc != 3)
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{
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sqlite3_result_error(context, "daap_charindex() requires 2 or 3 parameters", -1);
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return;
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}
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if ( SQLITE_NULL == sqlite3_value_type(argv[0]) || SQLITE_NULL == sqlite3_value_type(argv[1]))
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{
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sqlite3_result_null(context);
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return;
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}
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z1 = sqlite3_value_text(argv[0]);
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if (z1 == 0)
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return;
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z2 = (uint8_t*) sqlite3_value_text(argv[1]);
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if (argc == 3)
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{
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s = sqlite3_value_int(argv[2]) - 1;
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if (s < 0)
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{
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s = 0;
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}
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}
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else
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{
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s = 0;
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}
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rVal = _substr((char *) z1, (char *) z2, s, NULL);
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sqlite3_result_int(context, rVal + 1);
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}
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/*
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* Taken from "extension-functions.c" (function leftFunc) by Liam Healy (2010-02-06 15:45:07)
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* http://www.sqlite.org/contrib/download/extension-functions.c?get=25
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*
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* Given a string (s) and an integer (n) returns the n leftmost (UTF-8) characters
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* if the string has a length<=n or is NULL this function is NOP
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*/
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static void sqlext_daap_leftstr_xfunc(sqlite3_context *context, int argc, sqlite3_value **argv)
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{
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int c = 0;
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int cc = 0;
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int l = 0;
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const unsigned char *z; /* input string */
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const unsigned char *zt;
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unsigned char *rz; /* output string */
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//assert( argc==2);
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if (argc != 2 && argc != 3)
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{
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sqlite3_result_error(context, "daap_leftstr() requires 2 parameters", -1);
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return;
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}
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if ( SQLITE_NULL == sqlite3_value_type(argv[0]) || SQLITE_NULL == sqlite3_value_type(argv[1]))
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{
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sqlite3_result_null(context);
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return;
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}
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z = sqlite3_value_text(argv[0]);
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l = sqlite3_value_int(argv[1]);
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zt = z;
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while ( sqliteCharVal(zt) && c++ < l)
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sqliteNextChar(zt);
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cc = zt - z;
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rz = sqlite3_malloc(zt - z + 1);
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if (!rz)
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{
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sqlite3_result_error_nomem(context);
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return;
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}
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strncpy((char*) rz, (char*) z, zt - z);
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*(rz + cc) = '\0';
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sqlite3_result_text(context, (char*) rz, -1, SQLITE_TRANSIENT);
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sqlite3_free(rz);
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}
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int
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sqlite3_extension_init(sqlite3 *db, char **pzErrMsg, const sqlite3_api_routines *pApi)
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{
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@ -519,23 +268,5 @@ sqlite3_extension_init(sqlite3 *db, char **pzErrMsg, const sqlite3_api_routines
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return -1;
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}
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ret = sqlite3_create_function(db, "daap_leftstr", 2, SQLITE_UTF8, NULL, sqlext_daap_leftstr_xfunc, NULL, NULL);
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if (ret != SQLITE_OK)
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{
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if (pzErrMsg)
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*pzErrMsg = sqlite3_mprintf("Could not create daap_leftstr function: %s\n", sqlite3_errmsg(db));
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return -1;
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}
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ret = sqlite3_create_function(db, "daap_charindex", 3, SQLITE_UTF8, NULL, sqlext_daap_charindex_xfunc, NULL, NULL);
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if (ret != SQLITE_OK)
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{
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if (pzErrMsg)
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*pzErrMsg = sqlite3_mprintf("Could not create daap_charindex function: %s\n", sqlite3_errmsg(db));
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return -1;
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}
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return 0;
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}
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