diff options
Diffstat (limited to 'lib/libsqlite3/src/util.c')
| -rw-r--r-- | lib/libsqlite3/src/util.c | 1396 |
1 files changed, 0 insertions, 1396 deletions
diff --git a/lib/libsqlite3/src/util.c b/lib/libsqlite3/src/util.c deleted file mode 100644 index f218bb79417..00000000000 --- a/lib/libsqlite3/src/util.c +++ /dev/null @@ -1,1396 +0,0 @@ -/* -** 2001 September 15 -** -** The author disclaims copyright to this source code. In place of -** a legal notice, here is a blessing: -** -** May you do good and not evil. -** May you find forgiveness for yourself and forgive others. -** May you share freely, never taking more than you give. -** -************************************************************************* -** Utility functions used throughout sqlite. -** -** This file contains functions for allocating memory, comparing -** strings, and stuff like that. -** -*/ -#include "sqliteInt.h" -#include <stdarg.h> -#if HAVE_ISNAN || SQLITE_HAVE_ISNAN -# include <math.h> -#endif - -/* -** Routine needed to support the testcase() macro. -*/ -#ifdef SQLITE_COVERAGE_TEST -void sqlite3Coverage(int x){ - static unsigned dummy = 0; - dummy += (unsigned)x; -} -#endif - -/* -** Give a callback to the test harness that can be used to simulate faults -** in places where it is difficult or expensive to do so purely by means -** of inputs. -** -** The intent of the integer argument is to let the fault simulator know -** which of multiple sqlite3FaultSim() calls has been hit. -** -** Return whatever integer value the test callback returns, or return -** SQLITE_OK if no test callback is installed. -*/ -#ifndef SQLITE_OMIT_BUILTIN_TEST -int sqlite3FaultSim(int iTest){ - int (*xCallback)(int) = sqlite3GlobalConfig.xTestCallback; - return xCallback ? xCallback(iTest) : SQLITE_OK; -} -#endif - -#ifndef SQLITE_OMIT_FLOATING_POINT -/* -** Return true if the floating point value is Not a Number (NaN). -** -** Use the math library isnan() function if compiled with SQLITE_HAVE_ISNAN. -** Otherwise, we have our own implementation that works on most systems. -*/ -int sqlite3IsNaN(double x){ - int rc; /* The value return */ -#if !SQLITE_HAVE_ISNAN && !HAVE_ISNAN - /* - ** Systems that support the isnan() library function should probably - ** make use of it by compiling with -DSQLITE_HAVE_ISNAN. But we have - ** found that many systems do not have a working isnan() function so - ** this implementation is provided as an alternative. - ** - ** This NaN test sometimes fails if compiled on GCC with -ffast-math. - ** On the other hand, the use of -ffast-math comes with the following - ** warning: - ** - ** This option [-ffast-math] should never be turned on by any - ** -O option since it can result in incorrect output for programs - ** which depend on an exact implementation of IEEE or ISO - ** rules/specifications for math functions. - ** - ** Under MSVC, this NaN test may fail if compiled with a floating- - ** point precision mode other than /fp:precise. From the MSDN - ** documentation: - ** - ** The compiler [with /fp:precise] will properly handle comparisons - ** involving NaN. For example, x != x evaluates to true if x is NaN - ** ... - */ -#ifdef __FAST_MATH__ -# error SQLite will not work correctly with the -ffast-math option of GCC. -#endif - volatile double y = x; - volatile double z = y; - rc = (y!=z); -#else /* if HAVE_ISNAN */ - rc = isnan(x); -#endif /* HAVE_ISNAN */ - testcase( rc ); - return rc; -} -#endif /* SQLITE_OMIT_FLOATING_POINT */ - -/* -** Compute a string length that is limited to what can be stored in -** lower 30 bits of a 32-bit signed integer. -** -** The value returned will never be negative. Nor will it ever be greater -** than the actual length of the string. For very long strings (greater -** than 1GiB) the value returned might be less than the true string length. -*/ -int sqlite3Strlen30(const char *z){ - if( z==0 ) return 0; - return 0x3fffffff & (int)strlen(z); -} - -/* -** Set the current error code to err_code and clear any prior error message. -*/ -void sqlite3Error(sqlite3 *db, int err_code){ - assert( db!=0 ); - db->errCode = err_code; - if( db->pErr ) sqlite3ValueSetNull(db->pErr); -} - -/* -** Set the most recent error code and error string for the sqlite -** handle "db". The error code is set to "err_code". -** -** If it is not NULL, string zFormat specifies the format of the -** error string in the style of the printf functions: The following -** format characters are allowed: -** -** %s Insert a string -** %z A string that should be freed after use -** %d Insert an integer -** %T Insert a token -** %S Insert the first element of a SrcList -** -** zFormat and any string tokens that follow it are assumed to be -** encoded in UTF-8. -** -** To clear the most recent error for sqlite handle "db", sqlite3Error -** should be called with err_code set to SQLITE_OK and zFormat set -** to NULL. -*/ -void sqlite3ErrorWithMsg(sqlite3 *db, int err_code, const char *zFormat, ...){ - assert( db!=0 ); - db->errCode = err_code; - if( zFormat==0 ){ - sqlite3Error(db, err_code); - }else if( db->pErr || (db->pErr = sqlite3ValueNew(db))!=0 ){ - char *z; - va_list ap; - va_start(ap, zFormat); - z = sqlite3VMPrintf(db, zFormat, ap); - va_end(ap); - sqlite3ValueSetStr(db->pErr, -1, z, SQLITE_UTF8, SQLITE_DYNAMIC); - } -} - -/* -** Add an error message to pParse->zErrMsg and increment pParse->nErr. -** The following formatting characters are allowed: -** -** %s Insert a string -** %z A string that should be freed after use -** %d Insert an integer -** %T Insert a token -** %S Insert the first element of a SrcList -** -** This function should be used to report any error that occurs while -** compiling an SQL statement (i.e. within sqlite3_prepare()). The -** last thing the sqlite3_prepare() function does is copy the error -** stored by this function into the database handle using sqlite3Error(). -** Functions sqlite3Error() or sqlite3ErrorWithMsg() should be used -** during statement execution (sqlite3_step() etc.). -*/ -void sqlite3ErrorMsg(Parse *pParse, const char *zFormat, ...){ - char *zMsg; - va_list ap; - sqlite3 *db = pParse->db; - va_start(ap, zFormat); - zMsg = sqlite3VMPrintf(db, zFormat, ap); - va_end(ap); - if( db->suppressErr ){ - sqlite3DbFree(db, zMsg); - }else{ - pParse->nErr++; - sqlite3DbFree(db, pParse->zErrMsg); - pParse->zErrMsg = zMsg; - pParse->rc = SQLITE_ERROR; - } -} - -/* -** Convert an SQL-style quoted string into a normal string by removing -** the quote characters. The conversion is done in-place. If the -** input does not begin with a quote character, then this routine -** is a no-op. -** -** The input string must be zero-terminated. A new zero-terminator -** is added to the dequoted string. -** -** The return value is -1 if no dequoting occurs or the length of the -** dequoted string, exclusive of the zero terminator, if dequoting does -** occur. -** -** 2002-Feb-14: This routine is extended to remove MS-Access style -** brackets from around identifiers. For example: "[a-b-c]" becomes -** "a-b-c". -*/ -int sqlite3Dequote(char *z){ - char quote; - int i, j; - if( z==0 ) return -1; - quote = z[0]; - switch( quote ){ - case '\'': break; - case '"': break; - case '`': break; /* For MySQL compatibility */ - case '[': quote = ']'; break; /* For MS SqlServer compatibility */ - default: return -1; - } - for(i=1, j=0;; i++){ - assert( z[i] ); - if( z[i]==quote ){ - if( z[i+1]==quote ){ - z[j++] = quote; - i++; - }else{ - break; - } - }else{ - z[j++] = z[i]; - } - } - z[j] = 0; - return j; -} - -/* Convenient short-hand */ -#define UpperToLower sqlite3UpperToLower - -/* -** Some systems have stricmp(). Others have strcasecmp(). Because -** there is no consistency, we will define our own. -** -** IMPLEMENTATION-OF: R-30243-02494 The sqlite3_stricmp() and -** sqlite3_strnicmp() APIs allow applications and extensions to compare -** the contents of two buffers containing UTF-8 strings in a -** case-independent fashion, using the same definition of "case -** independence" that SQLite uses internally when comparing identifiers. -*/ -int sqlite3_stricmp(const char *zLeft, const char *zRight){ - register unsigned char *a, *b; - if( zLeft==0 ){ - return zRight ? -1 : 0; - }else if( zRight==0 ){ - return 1; - } - a = (unsigned char *)zLeft; - b = (unsigned char *)zRight; - while( *a!=0 && UpperToLower[*a]==UpperToLower[*b]){ a++; b++; } - return UpperToLower[*a] - UpperToLower[*b]; -} -int sqlite3_strnicmp(const char *zLeft, const char *zRight, int N){ - register unsigned char *a, *b; - if( zLeft==0 ){ - return zRight ? -1 : 0; - }else if( zRight==0 ){ - return 1; - } - a = (unsigned char *)zLeft; - b = (unsigned char *)zRight; - while( N-- > 0 && *a!=0 && UpperToLower[*a]==UpperToLower[*b]){ a++; b++; } - return N<0 ? 0 : UpperToLower[*a] - UpperToLower[*b]; -} - -/* -** The string z[] is an text representation of a real number. -** Convert this string to a double and write it into *pResult. -** -** The string z[] is length bytes in length (bytes, not characters) and -** uses the encoding enc. The string is not necessarily zero-terminated. -** -** Return TRUE if the result is a valid real number (or integer) and FALSE -** if the string is empty or contains extraneous text. Valid numbers -** are in one of these formats: -** -** [+-]digits[E[+-]digits] -** [+-]digits.[digits][E[+-]digits] -** [+-].digits[E[+-]digits] -** -** Leading and trailing whitespace is ignored for the purpose of determining -** validity. -** -** If some prefix of the input string is a valid number, this routine -** returns FALSE but it still converts the prefix and writes the result -** into *pResult. -*/ -int sqlite3AtoF(const char *z, double *pResult, int length, u8 enc){ -#ifndef SQLITE_OMIT_FLOATING_POINT - int incr; - const char *zEnd = z + length; - /* sign * significand * (10 ^ (esign * exponent)) */ - int sign = 1; /* sign of significand */ - i64 s = 0; /* significand */ - int d = 0; /* adjust exponent for shifting decimal point */ - int esign = 1; /* sign of exponent */ - int e = 0; /* exponent */ - int eValid = 1; /* True exponent is either not used or is well-formed */ - double result; - int nDigits = 0; - int nonNum = 0; - - assert( enc==SQLITE_UTF8 || enc==SQLITE_UTF16LE || enc==SQLITE_UTF16BE ); - *pResult = 0.0; /* Default return value, in case of an error */ - - if( enc==SQLITE_UTF8 ){ - incr = 1; - }else{ - int i; - incr = 2; - assert( SQLITE_UTF16LE==2 && SQLITE_UTF16BE==3 ); - for(i=3-enc; i<length && z[i]==0; i+=2){} - nonNum = i<length; - zEnd = z+i+enc-3; - z += (enc&1); - } - - /* skip leading spaces */ - while( z<zEnd && sqlite3Isspace(*z) ) z+=incr; - if( z>=zEnd ) return 0; - - /* get sign of significand */ - if( *z=='-' ){ - sign = -1; - z+=incr; - }else if( *z=='+' ){ - z+=incr; - } - - /* skip leading zeroes */ - while( z<zEnd && z[0]=='0' ) z+=incr, nDigits++; - - /* copy max significant digits to significand */ - while( z<zEnd && sqlite3Isdigit(*z) && s<((LARGEST_INT64-9)/10) ){ - s = s*10 + (*z - '0'); - z+=incr, nDigits++; - } - - /* skip non-significant significand digits - ** (increase exponent by d to shift decimal left) */ - while( z<zEnd && sqlite3Isdigit(*z) ) z+=incr, nDigits++, d++; - if( z>=zEnd ) goto do_atof_calc; - - /* if decimal point is present */ - if( *z=='.' ){ - z+=incr; - /* copy digits from after decimal to significand - ** (decrease exponent by d to shift decimal right) */ - while( z<zEnd && sqlite3Isdigit(*z) && s<((LARGEST_INT64-9)/10) ){ - s = s*10 + (*z - '0'); - z+=incr, nDigits++, d--; - } - /* skip non-significant digits */ - while( z<zEnd && sqlite3Isdigit(*z) ) z+=incr, nDigits++; - } - if( z>=zEnd ) goto do_atof_calc; - - /* if exponent is present */ - if( *z=='e' || *z=='E' ){ - z+=incr; - eValid = 0; - if( z>=zEnd ) goto do_atof_calc; - /* get sign of exponent */ - if( *z=='-' ){ - esign = -1; - z+=incr; - }else if( *z=='+' ){ - z+=incr; - } - /* copy digits to exponent */ - while( z<zEnd && sqlite3Isdigit(*z) ){ - e = e<10000 ? (e*10 + (*z - '0')) : 10000; - z+=incr; - eValid = 1; - } - } - - /* skip trailing spaces */ - if( nDigits && eValid ){ - while( z<zEnd && sqlite3Isspace(*z) ) z+=incr; - } - -do_atof_calc: - /* adjust exponent by d, and update sign */ - e = (e*esign) + d; - if( e<0 ) { - esign = -1; - e *= -1; - } else { - esign = 1; - } - - /* if 0 significand */ - if( !s ) { - /* In the IEEE 754 standard, zero is signed. - ** Add the sign if we've seen at least one digit */ - result = (sign<0 && nDigits) ? -(double)0 : (double)0; - } else { - /* attempt to reduce exponent */ - if( esign>0 ){ - while( s<(LARGEST_INT64/10) && e>0 ) e--,s*=10; - }else{ - while( !(s%10) && e>0 ) e--,s/=10; - } - - /* adjust the sign of significand */ - s = sign<0 ? -s : s; - - /* if exponent, scale significand as appropriate - ** and store in result. */ - if( e ){ - LONGDOUBLE_TYPE scale = 1.0; - /* attempt to handle extremely small/large numbers better */ - if( e>307 && e<342 ){ - while( e%308 ) { scale *= 1.0e+1; e -= 1; } - if( esign<0 ){ - result = s / scale; - result /= 1.0e+308; - }else{ - result = s * scale; - result *= 1.0e+308; - } - }else if( e>=342 ){ - if( esign<0 ){ - result = 0.0*s; - }else{ - result = 1e308*1e308*s; /* Infinity */ - } - }else{ - /* 1.0e+22 is the largest power of 10 than can be - ** represented exactly. */ - while( e%22 ) { scale *= 1.0e+1; e -= 1; } - while( e>0 ) { scale *= 1.0e+22; e -= 22; } - if( esign<0 ){ - result = s / scale; - }else{ - result = s * scale; - } - } - } else { - result = (double)s; - } - } - - /* store the result */ - *pResult = result; - - /* return true if number and no extra non-whitespace chracters after */ - return z>=zEnd && nDigits>0 && eValid && nonNum==0; -#else - return !sqlite3Atoi64(z, pResult, length, enc); -#endif /* SQLITE_OMIT_FLOATING_POINT */ -} - -/* -** Compare the 19-character string zNum against the text representation -** value 2^63: 9223372036854775808. Return negative, zero, or positive -** if zNum is less than, equal to, or greater than the string. -** Note that zNum must contain exactly 19 characters. -** -** Unlike memcmp() this routine is guaranteed to return the difference -** in the values of the last digit if the only difference is in the -** last digit. So, for example, -** -** compare2pow63("9223372036854775800", 1) -** -** will return -8. -*/ -static int compare2pow63(const char *zNum, int incr){ - int c = 0; - int i; - /* 012345678901234567 */ - const char *pow63 = "922337203685477580"; - for(i=0; c==0 && i<18; i++){ - c = (zNum[i*incr]-pow63[i])*10; - } - if( c==0 ){ - c = zNum[18*incr] - '8'; - testcase( c==(-1) ); - testcase( c==0 ); - testcase( c==(+1) ); - } - return c; -} - -/* -** Convert zNum to a 64-bit signed integer. zNum must be decimal. This -** routine does *not* accept hexadecimal notation. -** -** If the zNum value is representable as a 64-bit twos-complement -** integer, then write that value into *pNum and return 0. -** -** If zNum is exactly 9223372036854775808, return 2. This special -** case is broken out because while 9223372036854775808 cannot be a -** signed 64-bit integer, its negative -9223372036854775808 can be. -** -** If zNum is too big for a 64-bit integer and is not -** 9223372036854775808 or if zNum contains any non-numeric text, -** then return 1. -** -** length is the number of bytes in the string (bytes, not characters). -** The string is not necessarily zero-terminated. The encoding is -** given by enc. -*/ -int sqlite3Atoi64(const char *zNum, i64 *pNum, int length, u8 enc){ - int incr; - u64 u = 0; - int neg = 0; /* assume positive */ - int i; - int c = 0; - int nonNum = 0; - const char *zStart; - const char *zEnd = zNum + length; - assert( enc==SQLITE_UTF8 || enc==SQLITE_UTF16LE || enc==SQLITE_UTF16BE ); - if( enc==SQLITE_UTF8 ){ - incr = 1; - }else{ - incr = 2; - assert( SQLITE_UTF16LE==2 && SQLITE_UTF16BE==3 ); - for(i=3-enc; i<length && zNum[i]==0; i+=2){} - nonNum = i<length; - zEnd = zNum+i+enc-3; - zNum += (enc&1); - } - while( zNum<zEnd && sqlite3Isspace(*zNum) ) zNum+=incr; - if( zNum<zEnd ){ - if( *zNum=='-' ){ - neg = 1; - zNum+=incr; - }else if( *zNum=='+' ){ - zNum+=incr; - } - } - zStart = zNum; - while( zNum<zEnd && zNum[0]=='0' ){ zNum+=incr; } /* Skip leading zeros. */ - for(i=0; &zNum[i]<zEnd && (c=zNum[i])>='0' && c<='9'; i+=incr){ - u = u*10 + c - '0'; - } - if( u>LARGEST_INT64 ){ - *pNum = neg ? SMALLEST_INT64 : LARGEST_INT64; - }else if( neg ){ - *pNum = -(i64)u; - }else{ - *pNum = (i64)u; - } - testcase( i==18 ); - testcase( i==19 ); - testcase( i==20 ); - if( (c!=0 && &zNum[i]<zEnd) || (i==0 && zStart==zNum) || i>19*incr || nonNum ){ - /* zNum is empty or contains non-numeric text or is longer - ** than 19 digits (thus guaranteeing that it is too large) */ - return 1; - }else if( i<19*incr ){ - /* Less than 19 digits, so we know that it fits in 64 bits */ - assert( u<=LARGEST_INT64 ); - return 0; - }else{ - /* zNum is a 19-digit numbers. Compare it against 9223372036854775808. */ - c = compare2pow63(zNum, incr); - if( c<0 ){ - /* zNum is less than 9223372036854775808 so it fits */ - assert( u<=LARGEST_INT64 ); - return 0; - }else if( c>0 ){ - /* zNum is greater than 9223372036854775808 so it overflows */ - return 1; - }else{ - /* zNum is exactly 9223372036854775808. Fits if negative. The - ** special case 2 overflow if positive */ - assert( u-1==LARGEST_INT64 ); - return neg ? 0 : 2; - } - } -} - -/* -** Transform a UTF-8 integer literal, in either decimal or hexadecimal, -** into a 64-bit signed integer. This routine accepts hexadecimal literals, -** whereas sqlite3Atoi64() does not. -** -** Returns: -** -** 0 Successful transformation. Fits in a 64-bit signed integer. -** 1 Integer too large for a 64-bit signed integer or is malformed -** 2 Special case of 9223372036854775808 -*/ -int sqlite3DecOrHexToI64(const char *z, i64 *pOut){ -#ifndef SQLITE_OMIT_HEX_INTEGER - if( z[0]=='0' - && (z[1]=='x' || z[1]=='X') - && sqlite3Isxdigit(z[2]) - ){ - u64 u = 0; - int i, k; - for(i=2; z[i]=='0'; i++){} - for(k=i; sqlite3Isxdigit(z[k]); k++){ - u = u*16 + sqlite3HexToInt(z[k]); - } - memcpy(pOut, &u, 8); - return (z[k]==0 && k-i<=16) ? 0 : 1; - }else -#endif /* SQLITE_OMIT_HEX_INTEGER */ - { - return sqlite3Atoi64(z, pOut, sqlite3Strlen30(z), SQLITE_UTF8); - } -} - -/* -** If zNum represents an integer that will fit in 32-bits, then set -** *pValue to that integer and return true. Otherwise return false. -** -** This routine accepts both decimal and hexadecimal notation for integers. -** -** Any non-numeric characters that following zNum are ignored. -** This is different from sqlite3Atoi64() which requires the -** input number to be zero-terminated. -*/ -int sqlite3GetInt32(const char *zNum, int *pValue){ - sqlite_int64 v = 0; - int i, c; - int neg = 0; - if( zNum[0]=='-' ){ - neg = 1; - zNum++; - }else if( zNum[0]=='+' ){ - zNum++; - } -#ifndef SQLITE_OMIT_HEX_INTEGER - else if( zNum[0]=='0' - && (zNum[1]=='x' || zNum[1]=='X') - && sqlite3Isxdigit(zNum[2]) - ){ - u32 u = 0; - zNum += 2; - while( zNum[0]=='0' ) zNum++; - for(i=0; sqlite3Isxdigit(zNum[i]) && i<8; i++){ - u = u*16 + sqlite3HexToInt(zNum[i]); - } - if( (u&0x80000000)==0 && sqlite3Isxdigit(zNum[i])==0 ){ - memcpy(pValue, &u, 4); - return 1; - }else{ - return 0; - } - } -#endif - while( zNum[0]=='0' ) zNum++; - for(i=0; i<11 && (c = zNum[i] - '0')>=0 && c<=9; i++){ - v = v*10 + c; - } - - /* The longest decimal representation of a 32 bit integer is 10 digits: - ** - ** 1234567890 - ** 2^31 -> 2147483648 - */ - testcase( i==10 ); - if( i>10 ){ - return 0; - } - testcase( v-neg==2147483647 ); - if( v-neg>2147483647 ){ - return 0; - } - if( neg ){ - v = -v; - } - *pValue = (int)v; - return 1; -} - -/* -** Return a 32-bit integer value extracted from a string. If the -** string is not an integer, just return 0. -*/ -int sqlite3Atoi(const char *z){ - int x = 0; - if( z ) sqlite3GetInt32(z, &x); - return x; -} - -/* -** The variable-length integer encoding is as follows: -** -** KEY: -** A = 0xxxxxxx 7 bits of data and one flag bit -** B = 1xxxxxxx 7 bits of data and one flag bit -** C = xxxxxxxx 8 bits of data -** -** 7 bits - A -** 14 bits - BA -** 21 bits - BBA -** 28 bits - BBBA -** 35 bits - BBBBA -** 42 bits - BBBBBA -** 49 bits - BBBBBBA -** 56 bits - BBBBBBBA -** 64 bits - BBBBBBBBC -*/ - -/* -** Write a 64-bit variable-length integer to memory starting at p[0]. -** The length of data write will be between 1 and 9 bytes. The number -** of bytes written is returned. -** -** A variable-length integer consists of the lower 7 bits of each byte -** for all bytes that have the 8th bit set and one byte with the 8th -** bit clear. Except, if we get to the 9th byte, it stores the full -** 8 bits and is the last byte. -*/ -static int SQLITE_NOINLINE putVarint64(unsigned char *p, u64 v){ - int i, j, n; - u8 buf[10]; - if( v & (((u64)0xff000000)<<32) ){ - p[8] = (u8)v; - v >>= 8; - for(i=7; i>=0; i--){ - p[i] = (u8)((v & 0x7f) | 0x80); - v >>= 7; - } - return 9; - } - n = 0; - do{ - buf[n++] = (u8)((v & 0x7f) | 0x80); - v >>= 7; - }while( v!=0 ); - buf[0] &= 0x7f; - assert( n<=9 ); - for(i=0, j=n-1; j>=0; j--, i++){ - p[i] = buf[j]; - } - return n; -} -int sqlite3PutVarint(unsigned char *p, u64 v){ - if( v<=0x7f ){ - p[0] = v&0x7f; - return 1; - } - if( v<=0x3fff ){ - p[0] = ((v>>7)&0x7f)|0x80; - p[1] = v&0x7f; - return 2; - } - return putVarint64(p,v); -} - -/* -** Bitmasks used by sqlite3GetVarint(). These precomputed constants -** are defined here rather than simply putting the constant expressions -** inline in order to work around bugs in the RVT compiler. -** -** SLOT_2_0 A mask for (0x7f<<14) | 0x7f -** -** SLOT_4_2_0 A mask for (0x7f<<28) | SLOT_2_0 -*/ -#define SLOT_2_0 0x001fc07f -#define SLOT_4_2_0 0xf01fc07f - - -/* -** Read a 64-bit variable-length integer from memory starting at p[0]. -** Return the number of bytes read. The value is stored in *v. -*/ -u8 sqlite3GetVarint(const unsigned char *p, u64 *v){ - u32 a,b,s; - - a = *p; - /* a: p0 (unmasked) */ - if (!(a&0x80)) - { - *v = a; - return 1; - } - - p++; - b = *p; - /* b: p1 (unmasked) */ - if (!(b&0x80)) - { - a &= 0x7f; - a = a<<7; - a |= b; - *v = a; - return 2; - } - - /* Verify that constants are precomputed correctly */ - assert( SLOT_2_0 == ((0x7f<<14) | (0x7f)) ); - assert( SLOT_4_2_0 == ((0xfU<<28) | (0x7f<<14) | (0x7f)) ); - - p++; - a = a<<14; - a |= *p; - /* a: p0<<14 | p2 (unmasked) */ - if (!(a&0x80)) - { - a &= SLOT_2_0; - b &= 0x7f; - b = b<<7; - a |= b; - *v = a; - return 3; - } - - /* CSE1 from below */ - a &= SLOT_2_0; - p++; - b = b<<14; - b |= *p; - /* b: p1<<14 | p3 (unmasked) */ - if (!(b&0x80)) - { - b &= SLOT_2_0; - /* moved CSE1 up */ - /* a &= (0x7f<<14)|(0x7f); */ - a = a<<7; - a |= b; - *v = a; - return 4; - } - - /* a: p0<<14 | p2 (masked) */ - /* b: p1<<14 | p3 (unmasked) */ - /* 1:save off p0<<21 | p1<<14 | p2<<7 | p3 (masked) */ - /* moved CSE1 up */ - /* a &= (0x7f<<14)|(0x7f); */ - b &= SLOT_2_0; - s = a; - /* s: p0<<14 | p2 (masked) */ - - p++; - a = a<<14; - a |= *p; - /* a: p0<<28 | p2<<14 | p4 (unmasked) */ - if (!(a&0x80)) - { - /* we can skip these cause they were (effectively) done above in calc'ing s */ - /* a &= (0x7f<<28)|(0x7f<<14)|(0x7f); */ - /* b &= (0x7f<<14)|(0x7f); */ - b = b<<7; - a |= b; - s = s>>18; - *v = ((u64)s)<<32 | a; - return 5; - } - - /* 2:save off p0<<21 | p1<<14 | p2<<7 | p3 (masked) */ - s = s<<7; - s |= b; - /* s: p0<<21 | p1<<14 | p2<<7 | p3 (masked) */ - - p++; - b = b<<14; - b |= *p; - /* b: p1<<28 | p3<<14 | p5 (unmasked) */ - if (!(b&0x80)) - { - /* we can skip this cause it was (effectively) done above in calc'ing s */ - /* b &= (0x7f<<28)|(0x7f<<14)|(0x7f); */ - a &= SLOT_2_0; - a = a<<7; - a |= b; - s = s>>18; - *v = ((u64)s)<<32 | a; - return 6; - } - - p++; - a = a<<14; - a |= *p; - /* a: p2<<28 | p4<<14 | p6 (unmasked) */ - if (!(a&0x80)) - { - a &= SLOT_4_2_0; - b &= SLOT_2_0; - b = b<<7; - a |= b; - s = s>>11; - *v = ((u64)s)<<32 | a; - return 7; - } - - /* CSE2 from below */ - a &= SLOT_2_0; - p++; - b = b<<14; - b |= *p; - /* b: p3<<28 | p5<<14 | p7 (unmasked) */ - if (!(b&0x80)) - { - b &= SLOT_4_2_0; - /* moved CSE2 up */ - /* a &= (0x7f<<14)|(0x7f); */ - a = a<<7; - a |= b; - s = s>>4; - *v = ((u64)s)<<32 | a; - return 8; - } - - p++; - a = a<<15; - a |= *p; - /* a: p4<<29 | p6<<15 | p8 (unmasked) */ - - /* moved CSE2 up */ - /* a &= (0x7f<<29)|(0x7f<<15)|(0xff); */ - b &= SLOT_2_0; - b = b<<8; - a |= b; - - s = s<<4; - b = p[-4]; - b &= 0x7f; - b = b>>3; - s |= b; - - *v = ((u64)s)<<32 | a; - - return 9; -} - -/* -** Read a 32-bit variable-length integer from memory starting at p[0]. -** Return the number of bytes read. The value is stored in *v. -** -** If the varint stored in p[0] is larger than can fit in a 32-bit unsigned -** integer, then set *v to 0xffffffff. -** -** A MACRO version, getVarint32, is provided which inlines the -** single-byte case. All code should use the MACRO version as -** this function assumes the single-byte case has already been handled. -*/ -u8 sqlite3GetVarint32(const unsigned char *p, u32 *v){ - u32 a,b; - - /* The 1-byte case. Overwhelmingly the most common. Handled inline - ** by the getVarin32() macro */ - a = *p; - /* a: p0 (unmasked) */ -#ifndef getVarint32 - if (!(a&0x80)) - { - /* Values between 0 and 127 */ - *v = a; - return 1; - } -#endif - - /* The 2-byte case */ - p++; - b = *p; - /* b: p1 (unmasked) */ - if (!(b&0x80)) - { - /* Values between 128 and 16383 */ - a &= 0x7f; - a = a<<7; - *v = a | b; - return 2; - } - - /* The 3-byte case */ - p++; - a = a<<14; - a |= *p; - /* a: p0<<14 | p2 (unmasked) */ - if (!(a&0x80)) - { - /* Values between 16384 and 2097151 */ - a &= (0x7f<<14)|(0x7f); - b &= 0x7f; - b = b<<7; - *v = a | b; - return 3; - } - - /* A 32-bit varint is used to store size information in btrees. - ** Objects are rarely larger than 2MiB limit of a 3-byte varint. - ** A 3-byte varint is sufficient, for example, to record the size - ** of a 1048569-byte BLOB or string. - ** - ** We only unroll the first 1-, 2-, and 3- byte cases. The very - ** rare larger cases can be handled by the slower 64-bit varint - ** routine. - */ -#if 1 - { - u64 v64; - u8 n; - - p -= 2; - n = sqlite3GetVarint(p, &v64); - assert( n>3 && n<=9 ); - if( (v64 & SQLITE_MAX_U32)!=v64 ){ - *v = 0xffffffff; - }else{ - *v = (u32)v64; - } - return n; - } - -#else - /* For following code (kept for historical record only) shows an - ** unrolling for the 3- and 4-byte varint cases. This code is - ** slightly faster, but it is also larger and much harder to test. - */ - p++; - b = b<<14; - b |= *p; - /* b: p1<<14 | p3 (unmasked) */ - if (!(b&0x80)) - { - /* Values between 2097152 and 268435455 */ - b &= (0x7f<<14)|(0x7f); - a &= (0x7f<<14)|(0x7f); - a = a<<7; - *v = a | b; - return 4; - } - - p++; - a = a<<14; - a |= *p; - /* a: p0<<28 | p2<<14 | p4 (unmasked) */ - if (!(a&0x80)) - { - /* Values between 268435456 and 34359738367 */ - a &= SLOT_4_2_0; - b &= SLOT_4_2_0; - b = b<<7; - *v = a | b; - return 5; - } - - /* We can only reach this point when reading a corrupt database - ** file. In that case we are not in any hurry. Use the (relatively - ** slow) general-purpose sqlite3GetVarint() routine to extract the - ** value. */ - { - u64 v64; - u8 n; - - p -= 4; - n = sqlite3GetVarint(p, &v64); - assert( n>5 && n<=9 ); - *v = (u32)v64; - return n; - } -#endif -} - -/* -** Return the number of bytes that will be needed to store the given -** 64-bit integer. -*/ -int sqlite3VarintLen(u64 v){ - int i; - for(i=1; (v >>= 7)!=0; i++){ assert( i<9 ); } - return i; -} - - -/* -** Read or write a four-byte big-endian integer value. -*/ -u32 sqlite3Get4byte(const u8 *p){ -#if SQLITE_BYTEORDER==4321 - u32 x; - memcpy(&x,p,4); - return x; -#elif SQLITE_BYTEORDER==1234 && !defined(SQLITE_DISABLE_INTRINSIC) \ - && defined(__GNUC__) && GCC_VERSION>=4003000 - u32 x; - memcpy(&x,p,4); - return __builtin_bswap32(x); -#elif SQLITE_BYTEORDER==1234 && !defined(SQLITE_DISABLE_INTRINSIC) \ - && defined(_MSC_VER) && _MSC_VER>=1300 - u32 x; - memcpy(&x,p,4); - return _byteswap_ulong(x); -#else - testcase( p[0]&0x80 ); - return ((unsigned)p[0]<<24) | (p[1]<<16) | (p[2]<<8) | p[3]; -#endif -} -void sqlite3Put4byte(unsigned char *p, u32 v){ -#if SQLITE_BYTEORDER==4321 - memcpy(p,&v,4); -#elif SQLITE_BYTEORDER==1234 && defined(__GNUC__) && GCC_VERSION>=4003000 - u32 x = __builtin_bswap32(v); - memcpy(p,&x,4); -#elif SQLITE_BYTEORDER==1234 && defined(_MSC_VER) && _MSC_VER>=1300 - u32 x = _byteswap_ulong(v); - memcpy(p,&x,4); -#else - p[0] = (u8)(v>>24); - p[1] = (u8)(v>>16); - p[2] = (u8)(v>>8); - p[3] = (u8)v; -#endif -} - - - -/* -** Translate a single byte of Hex into an integer. -** This routine only works if h really is a valid hexadecimal -** character: 0..9a..fA..F -*/ -u8 sqlite3HexToInt(int h){ - assert( (h>='0' && h<='9') || (h>='a' && h<='f') || (h>='A' && h<='F') ); -#ifdef SQLITE_ASCII - h += 9*(1&(h>>6)); -#endif -#ifdef SQLITE_EBCDIC - h += 9*(1&~(h>>4)); -#endif - return (u8)(h & 0xf); -} - -#if !defined(SQLITE_OMIT_BLOB_LITERAL) || defined(SQLITE_HAS_CODEC) -/* -** Convert a BLOB literal of the form "x'hhhhhh'" into its binary -** value. Return a pointer to its binary value. Space to hold the -** binary value has been obtained from malloc and must be freed by -** the calling routine. -*/ -void *sqlite3HexToBlob(sqlite3 *db, const char *z, int n){ - char *zBlob; - int i; - - zBlob = (char *)sqlite3DbMallocRaw(db, n/2 + 1); - n--; - if( zBlob ){ - for(i=0; i<n; i+=2){ - zBlob[i/2] = (sqlite3HexToInt(z[i])<<4) | sqlite3HexToInt(z[i+1]); - } - zBlob[i/2] = 0; - } - return zBlob; -} -#endif /* !SQLITE_OMIT_BLOB_LITERAL || SQLITE_HAS_CODEC */ - -/* -** Log an error that is an API call on a connection pointer that should -** not have been used. The "type" of connection pointer is given as the -** argument. The zType is a word like "NULL" or "closed" or "invalid". -*/ -static void logBadConnection(const char *zType){ - sqlite3_log(SQLITE_MISUSE, - "API call with %s database connection pointer", - zType - ); -} - -/* -** Check to make sure we have a valid db pointer. This test is not -** foolproof but it does provide some measure of protection against -** misuse of the interface such as passing in db pointers that are -** NULL or which have been previously closed. If this routine returns -** 1 it means that the db pointer is valid and 0 if it should not be -** dereferenced for any reason. The calling function should invoke -** SQLITE_MISUSE immediately. -** -** sqlite3SafetyCheckOk() requires that the db pointer be valid for -** use. sqlite3SafetyCheckSickOrOk() allows a db pointer that failed to -** open properly and is not fit for general use but which can be -** used as an argument to sqlite3_errmsg() or sqlite3_close(). -*/ -int sqlite3SafetyCheckOk(sqlite3 *db){ - u32 magic; - if( db==0 ){ - logBadConnection("NULL"); - return 0; - } - magic = db->magic; - if( magic!=SQLITE_MAGIC_OPEN ){ - if( sqlite3SafetyCheckSickOrOk(db) ){ - testcase( sqlite3GlobalConfig.xLog!=0 ); - logBadConnection("unopened"); - } - return 0; - }else{ - return 1; - } -} -int sqlite3SafetyCheckSickOrOk(sqlite3 *db){ - u32 magic; - magic = db->magic; - if( magic!=SQLITE_MAGIC_SICK && - magic!=SQLITE_MAGIC_OPEN && - magic!=SQLITE_MAGIC_BUSY ){ - testcase( sqlite3GlobalConfig.xLog!=0 ); - logBadConnection("invalid"); - return 0; - }else{ - return 1; - } -} - -/* -** Attempt to add, substract, or multiply the 64-bit signed value iB against -** the other 64-bit signed integer at *pA and store the result in *pA. -** Return 0 on success. Or if the operation would have resulted in an -** overflow, leave *pA unchanged and return 1. -*/ -int sqlite3AddInt64(i64 *pA, i64 iB){ - i64 iA = *pA; - testcase( iA==0 ); testcase( iA==1 ); - testcase( iB==-1 ); testcase( iB==0 ); - if( iB>=0 ){ - testcase( iA>0 && LARGEST_INT64 - iA == iB ); - testcase( iA>0 && LARGEST_INT64 - iA == iB - 1 ); - if( iA>0 && LARGEST_INT64 - iA < iB ) return 1; - }else{ - testcase( iA<0 && -(iA + LARGEST_INT64) == iB + 1 ); - testcase( iA<0 && -(iA + LARGEST_INT64) == iB + 2 ); - if( iA<0 && -(iA + LARGEST_INT64) > iB + 1 ) return 1; - } - *pA += iB; - return 0; -} -int sqlite3SubInt64(i64 *pA, i64 iB){ - testcase( iB==SMALLEST_INT64+1 ); - if( iB==SMALLEST_INT64 ){ - testcase( (*pA)==(-1) ); testcase( (*pA)==0 ); - if( (*pA)>=0 ) return 1; - *pA -= iB; - return 0; - }else{ - return sqlite3AddInt64(pA, -iB); - } -} -#define TWOPOWER32 (((i64)1)<<32) -#define TWOPOWER31 (((i64)1)<<31) -int sqlite3MulInt64(i64 *pA, i64 iB){ - i64 iA = *pA; - i64 iA1, iA0, iB1, iB0, r; - - iA1 = iA/TWOPOWER32; - iA0 = iA % TWOPOWER32; - iB1 = iB/TWOPOWER32; - iB0 = iB % TWOPOWER32; - if( iA1==0 ){ - if( iB1==0 ){ - *pA *= iB; - return 0; - } - r = iA0*iB1; - }else if( iB1==0 ){ - r = iA1*iB0; - }else{ - /* If both iA1 and iB1 are non-zero, overflow will result */ - return 1; - } - testcase( r==(-TWOPOWER31)-1 ); - testcase( r==(-TWOPOWER31) ); - testcase( r==TWOPOWER31 ); - testcase( r==TWOPOWER31-1 ); - if( r<(-TWOPOWER31) || r>=TWOPOWER31 ) return 1; - r *= TWOPOWER32; - if( sqlite3AddInt64(&r, iA0*iB0) ) return 1; - *pA = r; - return 0; -} - -/* -** Compute the absolute value of a 32-bit signed integer, of possible. Or -** if the integer has a value of -2147483648, return +2147483647 -*/ -int sqlite3AbsInt32(int x){ - if( x>=0 ) return x; - if( x==(int)0x80000000 ) return 0x7fffffff; - return -x; -} - -#ifdef SQLITE_ENABLE_8_3_NAMES -/* -** If SQLITE_ENABLE_8_3_NAMES is set at compile-time and if the database -** filename in zBaseFilename is a URI with the "8_3_names=1" parameter and -** if filename in z[] has a suffix (a.k.a. "extension") that is longer than -** three characters, then shorten the suffix on z[] to be the last three -** characters of the original suffix. -** -** If SQLITE_ENABLE_8_3_NAMES is set to 2 at compile-time, then always -** do the suffix shortening regardless of URI parameter. -** -** Examples: -** -** test.db-journal => test.nal -** test.db-wal => test.wal -** test.db-shm => test.shm -** test.db-mj7f3319fa => test.9fa -*/ -void sqlite3FileSuffix3(const char *zBaseFilename, char *z){ -#if SQLITE_ENABLE_8_3_NAMES<2 - if( sqlite3_uri_boolean(zBaseFilename, "8_3_names", 0) ) -#endif - { - int i, sz; - sz = sqlite3Strlen30(z); - for(i=sz-1; i>0 && z[i]!='/' && z[i]!='.'; i--){} - if( z[i]=='.' && ALWAYS(sz>i+4) ) memmove(&z[i+1], &z[sz-3], 4); - } -} -#endif - -/* -** Find (an approximate) sum of two LogEst values. This computation is -** not a simple "+" operator because LogEst is stored as a logarithmic -** value. -** -*/ -LogEst sqlite3LogEstAdd(LogEst a, LogEst b){ - static const unsigned char x[] = { - 10, 10, /* 0,1 */ - 9, 9, /* 2,3 */ - 8, 8, /* 4,5 */ - 7, 7, 7, /* 6,7,8 */ - 6, 6, 6, /* 9,10,11 */ - 5, 5, 5, /* 12-14 */ - 4, 4, 4, 4, /* 15-18 */ - 3, 3, 3, 3, 3, 3, /* 19-24 */ - 2, 2, 2, 2, 2, 2, 2, /* 25-31 */ - }; - if( a>=b ){ - if( a>b+49 ) return a; - if( a>b+31 ) return a+1; - return a+x[a-b]; - }else{ - if( b>a+49 ) return b; - if( b>a+31 ) return b+1; - return b+x[b-a]; - } -} - -/* -** Convert an integer into a LogEst. In other words, compute an -** approximation for 10*log2(x). -*/ -LogEst sqlite3LogEst(u64 x){ - static LogEst a[] = { 0, 2, 3, 5, 6, 7, 8, 9 }; - LogEst y = 40; - if( x<8 ){ - if( x<2 ) return 0; - while( x<8 ){ y -= 10; x <<= 1; } - }else{ - while( x>255 ){ y += 40; x >>= 4; } - while( x>15 ){ y += 10; x >>= 1; } - } - return a[x&7] + y - 10; -} - -#ifndef SQLITE_OMIT_VIRTUALTABLE -/* -** Convert a double into a LogEst -** In other words, compute an approximation for 10*log2(x). -*/ -LogEst sqlite3LogEstFromDouble(double x){ - u64 a; - LogEst e; - assert( sizeof(x)==8 && sizeof(a)==8 ); - if( x<=1 ) return 0; - if( x<=2000000000 ) return sqlite3LogEst((u64)x); - memcpy(&a, &x, 8); - e = (a>>52) - 1022; - return e*10; -} -#endif /* SQLITE_OMIT_VIRTUALTABLE */ - -/* -** Convert a LogEst into an integer. -*/ -u64 sqlite3LogEstToInt(LogEst x){ - u64 n; - if( x<10 ) return 1; - n = x%10; - x /= 10; - if( n>=5 ) n -= 2; - else if( n>=1 ) n -= 1; - if( x>=3 ){ - return x>60 ? (u64)LARGEST_INT64 : (n+8)<<(x-3); - } - return (n+8)>>(3-x); -} |