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Diffstat (limited to 'src/util.c')
| -rw-r--r-- | src/util.c | 1186 |
1 files changed, 1186 insertions, 0 deletions
diff --git a/src/util.c b/src/util.c new file mode 100644 index 0000000..3356417 --- /dev/null +++ b/src/util.c @@ -0,0 +1,1186 @@ +/* +** 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> +#ifdef 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 + +#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 !defined(SQLITE_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 defined(SQLITE_HAVE_ISNAN) */ + rc = isnan(x); +#endif /* SQLITE_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){ + const char *z2 = z; + if( z==0 ) return 0; + while( *z2 ){ z2++; } + return 0x3fffffff & (int)(z2 - z); +} + +/* +** 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 sqlite3Error(sqlite3 *db, int err_code, const char *zFormat, ...){ + if( db && (db->pErr || (db->pErr = sqlite3ValueNew(db))!=0) ){ + db->errCode = err_code; + if( zFormat ){ + 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); + }else{ + sqlite3ValueSetStr(db->pErr, 0, 0, SQLITE_UTF8, SQLITE_STATIC); + } + } +} + +/* +** 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 whilst +** 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(). +** Function sqlite3Error() 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 identifers. 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; ALWAYS(z[i]); 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-20522-24639 The sqlite3_strnicmp() API allows +** 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 sqlite3StrICmp(const char *zLeft, const char *zRight){ + register unsigned char *a, *b; + 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; + 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 = (enc==SQLITE_UTF8?1:2); + 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; + + *pResult = 0.0; /* Default return value, in case of an error */ + + if( enc==SQLITE_UTF16BE ) z++; + + /* 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 ){ + double 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; +#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. +** +** 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 9223372036854665808, return 2. This special +** case is broken out because while 9223372036854665808 cannot be a +** signed 64-bit integer, its negative -9223372036854665808 can be. +** +** If zNum is too big for a 64-bit integer and is not +** 9223372036854665808 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 = (enc==SQLITE_UTF8?1:2); + u64 u = 0; + int neg = 0; /* assume positive */ + int i; + int c = 0; + const char *zStart; + const char *zEnd = zNum + length; + if( enc==SQLITE_UTF16BE ) zNum++; + 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 = SMALLEST_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 ){ + /* 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 ); + assert( (*pNum)==SMALLEST_INT64 ); + return neg ? 0 : 2; + } + } +} + +/* +** If zNum represents an integer that will fit in 32-bits, then set +** *pValue to that integer and return true. Otherwise return false. +** +** 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++; + } + 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. +*/ +int sqlite3PutVarint(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; +} + +/* +** This routine is a faster version of sqlite3PutVarint() that only +** works for 32-bit positive integers and which is optimized for +** the common case of small integers. A MACRO version, putVarint32, +** 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. +*/ +int sqlite3PutVarint32(unsigned char *p, u32 v){ +#ifndef putVarint32 + if( (v & ~0x7f)==0 ){ + p[0] = v; + return 1; + } +#endif + if( (v & ~0x3fff)==0 ){ + p[0] = (u8)((v>>7) | 0x80); + p[1] = (u8)(v & 0x7f); + return 2; + } + return sqlite3PutVarint(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 = 0; + do{ + i++; + v >>= 7; + }while( v!=0 && ALWAYS(i<9) ); + return i; +} + + +/* +** Read or write a four-byte big-endian integer value. +*/ +u32 sqlite3Get4byte(const u8 *p){ + return (p[0]<<24) | (p[1]<<16) | (p[2]<<8) | p[3]; +} +void sqlite3Put4byte(unsigned char *p, u32 v){ + p[0] = (u8)(v>>24); + p[1] = (u8)(v>>16); + p[2] = (u8)(v>>8); + p[3] = (u8)v; +} + + + +/* +** 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; + *pA += iB; + }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*iB1 != 0 ) return 1; + assert( iA1*iB0==0 || iA0*iB1==0 ); + r = iA1*iB0 + iA0*iB1; + 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 +*/ +void sqlite3FileSuffix3(const char *zBaseFilename, char *z){ +#if SQLITE_ENABLE_8_3_NAMES<2 + const char *zOk; + zOk = sqlite3_uri_parameter(zBaseFilename, "8_3_names"); + if( zOk && sqlite3GetBoolean(zOk) ) +#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) ) memcpy(&z[i+1], &z[sz-3], 4); + } +} +#endif |