libsecurity_filedb/lib/DbValue.cpp

   1 /*
   2  * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved.
   3  *
   4  * The contents of this file constitute Original Code as defined in and are
   5  * subject to the Apple Public Source License Version 1.2 (the 'License').
   6  * You may not use this file except in compliance with the License. Please obtain
   7  * a copy of the License at http://www.apple.com/publicsource and read it before
   8  * using this file.
   9  *
  10  * This Original Code and all software distributed under the License are
  11  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
  12  * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
  13  * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
  14  * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
  15  * specific language governing rights and limitations under the License.
  16  */
  17
  18
  19 //
  20 // DbValue.cpp
  21 //
  22
  23 #include "DbValue.h"
  24 #include <ctype.h>
  25
  26 //
  27 // DbValue
  28 //
  29
  30 DbValue::~DbValue()
  31 {
  32 }
  33
  34 //
  35 // UInt32Value
  36 //
  37
  38 UInt32Value::UInt32Value(const ReadSection &rs, uint32 &offset)
  39 :       BasicValue<uint32>(rs.at(offset))
  40 {
  41         offset += size();
  42 }
  43
  44 UInt32Value::UInt32Value(const CSSM_DATA &data)
  45 {
  46         switch (data.Length)
  47         {
  48                 case 1:
  49                         mValue = *reinterpret_cast<uint8 *>(data.Data);
  50                         break;
  51                 case 2:
  52                         mValue = *reinterpret_cast<uint16 *>(data.Data);
  53                         break;
  54                 case 4:
  55                         mValue = *reinterpret_cast<uint32 *>(data.Data);
  56                         break;
  57                 default:
  58                         CssmError::throwMe(CSSMERR_DL_INVALID_VALUE);
  59         }
  60 }
  61
  62 UInt32Value::~UInt32Value()
  63 {
  64 }
  65
  66 void
  67 UInt32Value::pack(WriteSection &ws, uint32 &offset) const
  68 {
  69         offset = ws.put(offset, mValue);
  70 }
  71
  72 //
  73 // SInt32Value
  74 //
  75
  76 SInt32Value::SInt32Value(const ReadSection &rs, uint32 &offset)
  77 :       BasicValue<sint32>(static_cast<sint32>(rs.at(offset)))
  78 {
  79         offset += size();
  80 }
  81
  82 SInt32Value::SInt32Value(const CSSM_DATA &data)
  83 {
  84         switch (data.Length)
  85         {
  86                 case 1:
  87                         mValue = *reinterpret_cast<sint8 *>(data.Data);
  88                         break;
  89                 case 2:
  90                         mValue = *reinterpret_cast<sint16 *>(data.Data);
  91                         break;
  92                 case 4:
  93                         mValue = *reinterpret_cast<sint32 *>(data.Data);
  94                         break;
  95                 default:
  96                         CssmError::throwMe(CSSMERR_DL_INVALID_VALUE);
  97         }
  98 }
  99
 100 SInt32Value::~SInt32Value()
 101 {
 102 }
 103
 104 void
 105 SInt32Value::pack(WriteSection &ws, uint32 &offset) const
 106 {
 107         offset = ws.put(offset, static_cast<uint32>(mValue));
 108 }
 109
 110 //
 111 // DoubleValue
 112 //
 113
 114 DoubleValue::DoubleValue(const ReadSection &rs, uint32 &offset)
 115 {
 116         Range r(offset, (uint32)size());
 117         mValue = *reinterpret_cast<const double *>(rs.range(r));
 118         offset += size();
 119 }
 120
 121 DoubleValue::DoubleValue(const CSSM_DATA &data)
 122 {
 123         switch (data.Length)
 124         {
 125                 case 4:
 126                         mValue = *reinterpret_cast<float *>(data.Data);
 127                         break;
 128                 case 8:
 129                         mValue = *reinterpret_cast<double *>(data.Data);
 130                         break;
 131                 default:
 132                         CssmError::throwMe(CSSMERR_DL_INVALID_VALUE);
 133         }
 134 }
 135
 136 DoubleValue::~DoubleValue()
 137 {
 138 }
 139
 140 void
 141 DoubleValue::pack(WriteSection &ws, uint32 &offset) const
 142 {
 143         offset = ws.put(offset, (uint32)size(), bytes());
 144 }
 145
 146 //
 147 // BlobValue
 148 //
 149
 150 BlobValue::BlobValue(const ReadSection &rs, uint32 &offset)
 151 {
 152         Length = rs.at(offset);
 153         Data = const_cast<uint8 *>(rs.range(Range(offset + AtomSize, (uint32)Length)));
 154         offset = ReadSection::align((uint32)(offset + Length + AtomSize));
 155 }
 156
 157 BlobValue::BlobValue(const CSSM_DATA &data)
 158 :       CssmData(CssmData::overlay(data))
 159 {
 160 }
 161
 162 BlobValue::~BlobValue()
 163 {
 164 }
 165
 166 void
 167 BlobValue::pack(WriteSection &ws, uint32 &offset) const
 168 {
 169         offset = ws.put(offset, (uint32)Length);
 170         offset = ws.put(offset, (uint32)Length, Data);
 171 }
 172
 173 BlobValue::Comparator::~Comparator()
 174 {
 175 }
 176
 177 int
 178 BlobValue::Comparator::operator () (const uint8 *ptr1, const uint8 *ptr2, uint32 length)
 179 {
 180         return memcmp(ptr1, ptr2, length);
 181 }
 182
 183 bool
 184 BlobValue::evaluate(const BlobValue &other, CSSM_DB_OPERATOR op) const
 185 {
 186         return evaluate(*this, other, op, Comparator());
 187 }
 188
 189 bool
 190 BlobValue::evaluate(const CssmData &inData1, const CssmData &inData2, CSSM_DB_OPERATOR op,
 191         Comparator compare)
 192 {
 193         uint32 length1 = (uint32)inData1.Length, length2 = (uint32)inData2.Length;
 194         const uint8 *data1 = inData1.Data;
 195         const uint8 *data2 = inData2.Data;
 196
 197         switch (op) {
 198
 199         case CSSM_DB_CONTAINS_INITIAL_SUBSTRING:
 200                 if (length1 > length2)
 201             return false;
 202         length2 = length1;
 203         goto DB_EQUAL;
 204
 205         case CSSM_DB_CONTAINS_FINAL_SUBSTRING:
 206         if (length1 > length2)
 207             return false;
 208                 data2 += (length2 - length1);
 209                 length2 = length1;
 210         // dropthrough...
 211
 212     case CSSM_DB_EQUAL:
 213         DB_EQUAL:
 214         if (length1 != length2)
 215             return false;
 216         if (length1 == 0)
 217             return true;
 218                 return compare(data1, data2, length1) == 0;
 219
 220     case CSSM_DB_NOT_EQUAL:
 221                 if (length1 != length2)
 222                         return true;
 223                 if (length1 == 0)
 224                         return false;
 225         return compare(data1, data2, length1) != 0;
 226
 227     case CSSM_DB_LESS_THAN:
 228     case CSSM_DB_GREATER_THAN:
 229     {
 230         uint32 length = min(length1, length2);
 231                 int result = (length == 0) ? 0 : compare(data1, data2, length);
 232
 233                 if (result < 0 || (result == 0 && length1 < length2))
 234                         return op == CSSM_DB_LESS_THAN;
 235                 else if (result > 0 || (result == 0 && length1 > length2))
 236                         return op == CSSM_DB_GREATER_THAN;
 237                 break;
 238         }
 239
 240     case CSSM_DB_CONTAINS:
 241         if (length1 > length2)
 242             return false;
 243         if (length1 == 0)
 244             return true;
 245         // Both buffers are at least 1 byte long.
 246         for (const uint8 *data = data2; data + length1 <= data2 + length2; data++)
 247                         if (compare(data1, data, length1) == 0)
 248                                 return true;
 249                 break;
 250
 251     default:
 252         CssmError::throwMe(CSSMERR_DL_UNSUPPORTED_QUERY);
 253     }
 254
 255     return false;
 256 }
 257
 258 //
 259 // TimeDateValue
 260 //
 261
 262 TimeDateValue::TimeDateValue(const ReadSection &rs, uint32 &offset)
 263 {
 264         Length = kTimeDateSize;
 265         Data = const_cast<uint8 *>(rs.range(Range(offset, (uint32)Length)));
 266         offset = ReadSection::align(offset + (uint32)Length);
 267 }
 268
 269 TimeDateValue::TimeDateValue(const CSSM_DATA &data)
 270 :       BlobValue(data)
 271 {
 272         if (Length != kTimeDateSize || !isValidDate())
 273                 CssmError::throwMe(CSSMERR_DL_INVALID_VALUE);
 274 }
 275
 276 TimeDateValue::~TimeDateValue()
 277 {
 278 }
 279
 280 void
 281 TimeDateValue::pack(WriteSection &ws, uint32 &offset) const
 282 {
 283         offset = ws.put(offset, (uint32)Length, Data);
 284 }
 285
 286 bool
 287 TimeDateValue::isValidDate() const
 288 {
 289         if (Length != kTimeDateSize || Data[kTimeDateSize - 1] != 0 ||
 290                 Data[kTimeDateSize - 2] != 'Z')
 291                 return false;
 292
 293         for (uint32 i = 0; i < kTimeDateSize - 2; i++)
 294                 if (!isdigit(Data[i]))
 295                         return false;
 296
 297         uint32 month = rangeValue(4, 2);
 298         if (month < 1 || month > 12)
 299                 return false;
 300
 301         uint32 day = rangeValue(6, 2);
 302         if (day < 1 || day > 31)
 303                 return false;
 304
 305         uint32 hour = rangeValue(8, 2);
 306         if (hour > 23)
 307                 return false;
 308
 309         uint32 minute = rangeValue(10, 2);
 310         if (minute > 59)
 311                 return false;
 312
 313         uint32 second = rangeValue(12, 2);
 314         if (second > 59)
 315                 return false;
 316
 317         return true;
 318 }
 319
 320 uint32
 321 TimeDateValue::rangeValue(uint32 start, uint32 length) const
 322 {
 323         uint32 value = 0;
 324         for (uint32 i = 0; i < length; i++)
 325                 value = value * 10 + Data[start + i] - '0';
 326         return value;
 327 }
 328
 329 //
 330 // StringValue
 331 //
 332
 333 StringValue::StringValue(const ReadSection &rs, uint32 &offset)
 334 :       BlobValue(rs, offset)
 335 {
 336 }
 337
 338 StringValue::StringValue(const CSSM_DATA &data)
 339 :       BlobValue(data)
 340 {
 341 }
 342
 343 StringValue::~StringValue()
 344 {
 345 }
 346
 347 int
 348 StringValue::Comparator::operator () (const uint8 *ptr1, const uint8 *ptr2, uint32 length)
 349 {
 350         return strncmp(reinterpret_cast<const char *>(ptr1),
 351                 reinterpret_cast<const char *>(ptr2), length);
 352 }
 353
 354 bool
 355 StringValue::evaluate(const StringValue &other, CSSM_DB_OPERATOR op) const
 356 {
 357         return BlobValue::evaluate(*this, other, op, StringValue::Comparator());
 358 }
 359
 360 //
 361 // BigNumValue
 362 //
 363
 364 BigNumValue::BigNumValue(const ReadSection &rs, uint32 &offset)
 365 :       BlobValue(rs, offset)
 366 {
 367 }
 368
 369 BigNumValue::BigNumValue(const CSSM_DATA &data)
 370 :       BlobValue(data)
 371 {
 372         // remove trailing zero bytes
 373         while (Length > 1 && Data[Length - 1] == 0)
 374                 Length--;
 375
 376         // if the number is zero (positive or negative), make the length zero
 377         if (Length == 1 && (Data[0] & ~kSignBit) == 0)
 378                 Length = 0;
 379 }
 380
 381 BigNumValue::~BigNumValue()
 382 {
 383 }
 384
 385 // Walk the contents of two equal-sized bignums, moving backward
 386 // from the high-order bytes, and return the comparison result
 387 // ala memcmp.
 388
 389 int
 390 BigNumValue::compare(const uint8 *a, const uint8 *b, int length)
 391 {
 392         for (int diff, i = length - 1; i >= 1; i--)
 393                 if ((diff = a[i] - b[i]))
 394                         return diff;
 395
 396         // for the last (i.e. first) byte, mask out the sign bit
 397         return (a[0] & ~kSignBit) - (b[0] & ~kSignBit);
 398 }
 399
 400 // Compare two bignums, assuming they are in canonical form (i.e.,
 401 // no bytes containing trailing zeros.
 402
 403 bool
 404 BigNumValue::evaluate(const BigNumValue &other, CSSM_DB_OPERATOR op) const
 405 {
 406         uint32 length1 = (uint32)Length, length2 = (uint32)other.Length;
 407         uint8 sign1 = length1 ? (Data[0] & kSignBit) : 0;
 408         uint8 sign2 = length2 ? (other.Data[0] & kSignBit) : 0;
 409
 410         switch (op)
 411         {
 412         case CSSM_DB_EQUAL:
 413         case CSSM_DB_NOT_EQUAL:
 414                 return BlobValue::evaluate(other, op);
 415
 416         case CSSM_DB_LESS_THAN:
 417                 if (sign1 ^ sign2)
 418                         // different signs: return true iff left value is the negative one
 419                         return sign1;
 420                 else if (length1 != length2)
 421                         // in canonical form, shorter numbers have smaller absolute value
 422                         return sign1 ? (length1 > length2) : (length1 < length2);
 423                 else {
 424                         // same length, same sign...
 425                         int c = compare(Data, other.Data, length1);
 426                         return sign1 ? (c > 0) : (c < 0);
 427                 }
 428                 break;
 429
 430         case CSSM_DB_GREATER_THAN:
 431                 if (sign1 ^ sign2)
 432                         return sign2;
 433                 else if (length1 != length2)
 434                         return sign1 ? (length1 < length2) : (length1 > length2);
 435                 else {
 436                         int c = compare(Data, other.Data, length1);
 437                         return sign1 ? (c < 0) : (c > 0);
 438                 }
 439                 break;
 440
 441         case CSSM_DB_CONTAINS:
 442         case CSSM_DB_CONTAINS_INITIAL_SUBSTRING:
 443         case CSSM_DB_CONTAINS_FINAL_SUBSTRING:
 444         default:
 445                 CssmError::throwMe(CSSMERR_DL_UNSUPPORTED_QUERY);
 446         }
 447 }
 448
 449 //
 450 // MultiUInt32Value
 451 //
 452
 453 MultiUInt32Value::MultiUInt32Value(const ReadSection &rs, uint32 &offset)
 454 {
 455         // this is relatively expensive, since it copies the data from the
 456         // read section to get the endianness correct
 457
 458         mNumValues = rs.at(offset);
 459         mValues = new uint32[mNumValues];
 460
 461         for (uint32 i = 0; i < mNumValues; i++)
 462                 mValues[i] = rs.at(offset + (i + 1) * AtomSize);
 463
 464         offset = ReadSection::align(offset + (mNumValues + 1) * AtomSize);
 465         mOwnsValues = true;
 466 }
 467
 468 MultiUInt32Value::MultiUInt32Value(const CSSM_DATA &data)
 469 {
 470         if (data.Length & (sizeof(uint32) - 1))
 471                 CssmError::throwMe(CSSMERR_DL_INVALID_VALUE);
 472
 473         mNumValues = (uint32)(data.Length / sizeof(uint32));
 474         mValues = reinterpret_cast<uint32 *>(data.Data);
 475         mOwnsValues = false;
 476 }
 477
 478 MultiUInt32Value::~MultiUInt32Value()
 479 {
 480         if (mOwnsValues)
 481                 delete [] mValues;
 482 }
 483
 484 void
 485 MultiUInt32Value::pack(WriteSection &ws, uint32 &offset) const
 486 {
 487         offset = ws.put(offset, mNumValues);
 488         for (uint32 i = 0; i < mNumValues; i++)
 489                 offset = ws.put(offset, mValues[i]);
 490 }
 491
 492 static inline int
 493 uint32cmp(const uint32 *a, const uint32 *b, uint32 length)
 494 {
 495         return memcmp(a, b, length * sizeof(uint32));
 496 }
 497
 498 bool
 499 MultiUInt32Value::evaluate(const MultiUInt32Value &other, CSSM_DB_OPERATOR op) const
 500 {
 501         uint32 length1 = mNumValues, length2 = other.mNumValues;
 502         const uint32 *values1 = mValues;
 503         const uint32 *values2 = other.mValues;
 504
 505         switch (op)
 506         {
 507         case CSSM_DB_EQUAL:
 508                 if (length1 == length2)
 509                         return uint32cmp(values1, values2, length1) == 0;
 510                 break;
 511
 512         case CSSM_DB_NOT_EQUAL:
 513                 if (length1 != length2 || uint32cmp(values1, values2, length1))
 514                         return true;
 515                 break;
 516
 517         case CSSM_DB_CONTAINS_INITIAL_SUBSTRING:
 518                 if (length1 <= length2)
 519                         return uint32cmp(values1, values2, length1) == 0;
 520                 break;
 521
 522         case CSSM_DB_CONTAINS_FINAL_SUBSTRING:
 523                 if (length1 <= length2)
 524                         return uint32cmp(values1, values2 + (length2 - length1), length1) == 0;
 525                 break;
 526
 527         case CSSM_DB_CONTAINS:
 528                 if (length1 <= length2) {
 529
 530                         if (length1 == 0)
 531                                 return true;
 532
 533                         for (const uint32 *values = values2; values + length1 < values2 + length2; values++)
 534                                 if (uint32cmp(values1, values, length1) == 0)
 535                                         return true;
 536                 }
 537                 break;
 538
 539         case CSSM_DB_LESS_THAN:
 540                 // this is not required by the spec, but is required to sort indexes over
 541                 // multi uint32 keys...
 542                 if (length1 < length2)
 543                         return true;
 544                 else if (length1 == length2)
 545                         return uint32cmp(values1, values2, length1) < 0;
 546                 break;
 547
 548         default:
 549                 CssmError::throwMe(CSSMERR_DL_UNSUPPORTED_QUERY);
 550         }
 551
 552         return false;
 553 }
 554
 555