src/serialize.h

   1 // Copyright (c) 2009-2010 Satoshi Nakamoto
   2 // Copyright (c) 2009-2014 The Bitcoin Core developers
   3 // Distributed under the MIT software license, see the accompanying
   4 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   5
   6 #ifndef BITCOIN_SERIALIZE_H
   7 #define BITCOIN_SERIALIZE_H
   8
   9 #include "compat/endian.h"
  10
  11 #include <algorithm>
  12 #include <assert.h>
  13 #include <ios>
  14 #include <limits>
  15 #include <map>
  16 #include <set>
  17 #include <stdint.h>
  18 #include <string>
  19 #include <string.h>
  20 #include <utility>
  21 #include <vector>
  22
  23 class CScript;
  24
  25 static const unsigned int MAX_SIZE = 0x02000000;
  26
  27 /**
  28  * Used to bypass the rule against non-const reference to temporary
  29  * where it makes sense with wrappers such as CFlatData or CTxDB
  30  */
  31 template<typename T>
  32 inline T& REF(const T& val)
  33 {
  34     return const_cast<T&>(val);
  35 }
  36
  37 /**
  38  * Used to acquire a non-const pointer "this" to generate bodies
  39  * of const serialization operations from a template
  40  */
  41 template<typename T>
  42 inline T* NCONST_PTR(const T* val)
  43 {
  44     return const_cast<T*>(val);
  45 }
  46
  47 /**
  48  * Get begin pointer of vector (non-const version).
  49  * @note These functions avoid the undefined case of indexing into an empty
  50  * vector, as well as that of indexing after the end of the vector.
  51  */
  52 template <class T, class TAl>
  53 inline T* begin_ptr(std::vector<T,TAl>& v)
  54 {
  55     return v.empty() ? NULL : &v[0];
  56 }
  57 /** Get begin pointer of vector (const version) */
  58 template <class T, class TAl>
  59 inline const T* begin_ptr(const std::vector<T,TAl>& v)
  60 {
  61     return v.empty() ? NULL : &v[0];
  62 }
  63 /** Get end pointer of vector (non-const version) */
  64 template <class T, class TAl>
  65 inline T* end_ptr(std::vector<T,TAl>& v)
  66 {
  67     return v.empty() ? NULL : (&v[0] + v.size());
  68 }
  69 /** Get end pointer of vector (const version) */
  70 template <class T, class TAl>
  71 inline const T* end_ptr(const std::vector<T,TAl>& v)
  72 {
  73     return v.empty() ? NULL : (&v[0] + v.size());
  74 }
  75
  76 /*
  77  * Lowest-level serialization and conversion.
  78  * @note Sizes of these types are verified in the tests
  79  */
  80 template<typename Stream> inline void ser_writedata8(Stream &s, uint8_t obj)
  81 {
  82     s.write((char*)&obj, 1);
  83 }
  84 template<typename Stream> inline void ser_writedata16(Stream &s, uint16_t obj)
  85 {
  86     obj = htole16(obj);
  87     s.write((char*)&obj, 2);
  88 }
  89 template<typename Stream> inline void ser_writedata32(Stream &s, uint32_t obj)
  90 {
  91     obj = htole32(obj);
  92     s.write((char*)&obj, 4);
  93 }
  94 template<typename Stream> inline void ser_writedata64(Stream &s, uint64_t obj)
  95 {
  96     obj = htole64(obj);
  97     s.write((char*)&obj, 8);
  98 }
  99 template<typename Stream> inline uint8_t ser_readdata8(Stream &s)
 100 {
 101     uint8_t obj;
 102     s.read((char*)&obj, 1);
 103     return obj;
 104 }
 105 template<typename Stream> inline uint16_t ser_readdata16(Stream &s)
 106 {
 107     uint16_t obj;
 108     s.read((char*)&obj, 2);
 109     return le16toh(obj);
 110 }
 111 template<typename Stream> inline uint32_t ser_readdata32(Stream &s)
 112 {
 113     uint32_t obj;
 114     s.read((char*)&obj, 4);
 115     return le32toh(obj);
 116 }
 117 template<typename Stream> inline uint64_t ser_readdata64(Stream &s)
 118 {
 119     uint64_t obj;
 120     s.read((char*)&obj, 8);
 121     return le64toh(obj);
 122 }
 123 inline uint64_t ser_double_to_uint64(double x)
 124 {
 125     union { double x; uint64_t y; } tmp;
 126     tmp.x = x;
 127     return tmp.y;
 128 }
 129 inline uint32_t ser_float_to_uint32(float x)
 130 {
 131     union { float x; uint32_t y; } tmp;
 132     tmp.x = x;
 133     return tmp.y;
 134 }
 135 inline double ser_uint64_to_double(uint64_t y)
 136 {
 137     union { double x; uint64_t y; } tmp;
 138     tmp.y = y;
 139     return tmp.x;
 140 }
 141 inline float ser_uint32_to_float(uint32_t y)
 142 {
 143     union { float x; uint32_t y; } tmp;
 144     tmp.y = y;
 145     return tmp.x;
 146 }
 147
 148
 149 /////////////////////////////////////////////////////////////////
 150 //
 151 // Templates for serializing to anything that looks like a stream,
 152 // i.e. anything that supports .read(char*, size_t) and .write(char*, size_t)
 153 //
 154
 155 enum
 156 {
 157     // primary actions
 158     SER_NETWORK         = (1 << 0),
 159     SER_DISK            = (1 << 1),
 160     SER_GETHASH         = (1 << 2),
 161 };
 162
 163 #define READWRITE(obj)      (::SerReadWrite(s, (obj), nType, nVersion, ser_action))
 164
 165 /**
 166  * Implement three methods for serializable objects. These are actually wrappers over
 167  * "SerializationOp" template, which implements the body of each class' serialization
 168  * code. Adding "ADD_SERIALIZE_METHODS" in the body of the class causes these wrappers to be
 169  * added as members.
 170  */
 171 #define ADD_SERIALIZE_METHODS                                                          \
 172     size_t GetSerializeSize(int nType, int nVersion) const {                         \
 173         CSizeComputer s(nType, nVersion);                                            \
 174         NCONST_PTR(this)->SerializationOp(s, CSerActionSerialize(), nType, nVersion);\
 175         return s.size();                                                             \
 176     }                                                                                \
 177     template<typename Stream>                                                        \
 178     void Serialize(Stream& s, int nType, int nVersion) const {                       \
 179         NCONST_PTR(this)->SerializationOp(s, CSerActionSerialize(), nType, nVersion);\
 180     }                                                                                \
 181     template<typename Stream>                                                        \
 182     void Unserialize(Stream& s, int nType, int nVersion) {                           \
 183         SerializationOp(s, CSerActionUnserialize(), nType, nVersion);                \
 184     }
 185
 186 /*
 187  * Basic Types
 188  */
 189 inline unsigned int GetSerializeSize(char a,      int, int=0) { return 1; }
 190 inline unsigned int GetSerializeSize(int8_t a,    int, int=0) { return 1; }
 191 inline unsigned int GetSerializeSize(uint8_t a,   int, int=0) { return 1; }
 192 inline unsigned int GetSerializeSize(int16_t a,   int, int=0) { return 2; }
 193 inline unsigned int GetSerializeSize(uint16_t a,  int, int=0) { return 2; }
 194 inline unsigned int GetSerializeSize(int32_t a,   int, int=0) { return 4; }
 195 inline unsigned int GetSerializeSize(uint32_t a,  int, int=0) { return 4; }
 196 inline unsigned int GetSerializeSize(int64_t a,   int, int=0) { return 8; }
 197 inline unsigned int GetSerializeSize(uint64_t a,  int, int=0) { return 8; }
 198 inline unsigned int GetSerializeSize(float a,     int, int=0) { return 4; }
 199 inline unsigned int GetSerializeSize(double a,    int, int=0) { return 8; }
 200
 201 template<typename Stream> inline void Serialize(Stream& s, char a,         int, int=0) { ser_writedata8(s, a); } // TODO Get rid of bare char
 202 template<typename Stream> inline void Serialize(Stream& s, int8_t a,       int, int=0) { ser_writedata8(s, a); }
 203 template<typename Stream> inline void Serialize(Stream& s, uint8_t a,      int, int=0) { ser_writedata8(s, a); }
 204 template<typename Stream> inline void Serialize(Stream& s, int16_t a,      int, int=0) { ser_writedata16(s, a); }
 205 template<typename Stream> inline void Serialize(Stream& s, uint16_t a,     int, int=0) { ser_writedata16(s, a); }
 206 template<typename Stream> inline void Serialize(Stream& s, int32_t a,      int, int=0) { ser_writedata32(s, a); }
 207 template<typename Stream> inline void Serialize(Stream& s, uint32_t a,     int, int=0) { ser_writedata32(s, a); }
 208 template<typename Stream> inline void Serialize(Stream& s, int64_t a,      int, int=0) { ser_writedata64(s, a); }
 209 template<typename Stream> inline void Serialize(Stream& s, uint64_t a,     int, int=0) { ser_writedata64(s, a); }
 210 template<typename Stream> inline void Serialize(Stream& s, float a,        int, int=0) { ser_writedata32(s, ser_float_to_uint32(a)); }
 211 template<typename Stream> inline void Serialize(Stream& s, double a,       int, int=0) { ser_writedata64(s, ser_double_to_uint64(a)); }
 212
 213 template<typename Stream> inline void Unserialize(Stream& s, char& a,      int, int=0) { a = ser_readdata8(s); } // TODO Get rid of bare char
 214 template<typename Stream> inline void Unserialize(Stream& s, int8_t& a,    int, int=0) { a = ser_readdata8(s); }
 215 template<typename Stream> inline void Unserialize(Stream& s, uint8_t& a,   int, int=0) { a = ser_readdata8(s); }
 216 template<typename Stream> inline void Unserialize(Stream& s, int16_t& a,   int, int=0) { a = ser_readdata16(s); }
 217 template<typename Stream> inline void Unserialize(Stream& s, uint16_t& a,  int, int=0) { a = ser_readdata16(s); }
 218 template<typename Stream> inline void Unserialize(Stream& s, int32_t& a,   int, int=0) { a = ser_readdata32(s); }
 219 template<typename Stream> inline void Unserialize(Stream& s, uint32_t& a,  int, int=0) { a = ser_readdata32(s); }
 220 template<typename Stream> inline void Unserialize(Stream& s, int64_t& a,   int, int=0) { a = ser_readdata64(s); }
 221 template<typename Stream> inline void Unserialize(Stream& s, uint64_t& a,  int, int=0) { a = ser_readdata64(s); }
 222 template<typename Stream> inline void Unserialize(Stream& s, float& a,     int, int=0) { a = ser_uint32_to_float(ser_readdata32(s)); }
 223 template<typename Stream> inline void Unserialize(Stream& s, double& a,    int, int=0) { a = ser_uint64_to_double(ser_readdata64(s)); }
 224
 225 inline unsigned int GetSerializeSize(bool a, int, int=0)                          { return sizeof(char); }
 226 template<typename Stream> inline void Serialize(Stream& s, bool a, int, int=0)    { char f=a; ser_writedata8(s, f); }
 227 template<typename Stream> inline void Unserialize(Stream& s, bool& a, int, int=0) { char f=ser_readdata8(s); a=f; }
 228
 229
 230
 231
 232
 233
 234 /**
 235  * Compact Size
 236  * size <  253        -- 1 byte
 237  * size <= USHRT_MAX  -- 3 bytes  (253 + 2 bytes)
 238  * size <= UINT_MAX   -- 5 bytes  (254 + 4 bytes)
 239  * size >  UINT_MAX   -- 9 bytes  (255 + 8 bytes)
 240  */
 241 inline unsigned int GetSizeOfCompactSize(uint64_t nSize)
 242 {
 243     if (nSize < 253)             return sizeof(unsigned char);
 244     else if (nSize <= std::numeric_limits<unsigned short>::max()) return sizeof(unsigned char) + sizeof(unsigned short);
 245     else if (nSize <= std::numeric_limits<unsigned int>::max())  return sizeof(unsigned char) + sizeof(unsigned int);
 246     else                         return sizeof(unsigned char) + sizeof(uint64_t);
 247 }
 248
 249 template<typename Stream>
 250 void WriteCompactSize(Stream& os, uint64_t nSize)
 251 {
 252     if (nSize < 253)
 253     {
 254         ser_writedata8(os, nSize);
 255     }
 256     else if (nSize <= std::numeric_limits<unsigned short>::max())
 257     {
 258         ser_writedata8(os, 253);
 259         ser_writedata16(os, nSize);
 260     }
 261     else if (nSize <= std::numeric_limits<unsigned int>::max())
 262     {
 263         ser_writedata8(os, 254);
 264         ser_writedata32(os, nSize);
 265     }
 266     else
 267     {
 268         ser_writedata8(os, 255);
 269         ser_writedata64(os, nSize);
 270     }
 271     return;
 272 }
 273
 274 template<typename Stream>
 275 uint64_t ReadCompactSize(Stream& is)
 276 {
 277     uint8_t chSize = ser_readdata8(is);
 278     uint64_t nSizeRet = 0;
 279     if (chSize < 253)
 280     {
 281         nSizeRet = chSize;
 282     }
 283     else if (chSize == 253)
 284     {
 285         nSizeRet = ser_readdata16(is);
 286         if (nSizeRet < 253)
 287             throw std::ios_base::failure("non-canonical ReadCompactSize()");
 288     }
 289     else if (chSize == 254)
 290     {
 291         nSizeRet = ser_readdata32(is);
 292         if (nSizeRet < 0x10000u)
 293             throw std::ios_base::failure("non-canonical ReadCompactSize()");
 294     }
 295     else
 296     {
 297         nSizeRet = ser_readdata64(is);
 298         if (nSizeRet < 0x100000000ULL)
 299             throw std::ios_base::failure("non-canonical ReadCompactSize()");
 300     }
 301     if (nSizeRet > (uint64_t)MAX_SIZE)
 302         throw std::ios_base::failure("ReadCompactSize(): size too large");
 303     return nSizeRet;
 304 }
 305
 306 /**
 307  * Variable-length integers: bytes are a MSB base-128 encoding of the number.
 308  * The high bit in each byte signifies whether another digit follows. To make
 309  * sure the encoding is one-to-one, one is subtracted from all but the last digit.
 310  * Thus, the byte sequence a[] with length len, where all but the last byte
 311  * has bit 128 set, encodes the number:
 312  *
 313  *  (a[len-1] & 0x7F) + sum(i=1..len-1, 128^i*((a[len-i-1] & 0x7F)+1))
 314  *
 315  * Properties:
 316  * * Very small (0-127: 1 byte, 128-16511: 2 bytes, 16512-2113663: 3 bytes)
 317  * * Every integer has exactly one encoding
 318  * * Encoding does not depend on size of original integer type
 319  * * No redundancy: every (infinite) byte sequence corresponds to a list
 320  *   of encoded integers.
 321  *
 322  * 0:         [0x00]  256:        [0x81 0x00]
 323  * 1:         [0x01]  16383:      [0xFE 0x7F]
 324  * 127:       [0x7F]  16384:      [0xFF 0x00]
 325  * 128:  [0x80 0x00]  16511: [0x80 0xFF 0x7F]
 326  * 255:  [0x80 0x7F]  65535: [0x82 0xFD 0x7F]
 327  * 2^32:           [0x8E 0xFE 0xFE 0xFF 0x00]
 328  */
 329
 330 template<typename I>
 331 inline unsigned int GetSizeOfVarInt(I n)
 332 {
 333     int nRet = 0;
 334     while(true) {
 335         nRet++;
 336         if (n <= 0x7F)
 337             break;
 338         n = (n >> 7) - 1;
 339     }
 340     return nRet;
 341 }
 342
 343 template<typename Stream, typename I>
 344 void WriteVarInt(Stream& os, I n)
 345 {
 346     unsigned char tmp[(sizeof(n)*8+6)/7];
 347     int len=0;
 348     while(true) {
 349         tmp[len] = (n & 0x7F) | (len ? 0x80 : 0x00);
 350         if (n <= 0x7F)
 351             break;
 352         n = (n >> 7) - 1;
 353         len++;
 354     }
 355     do {
 356         ser_writedata8(os, tmp[len]);
 357     } while(len--);
 358 }
 359
 360 template<typename Stream, typename I>
 361 I ReadVarInt(Stream& is)
 362 {
 363     I n = 0;
 364     while(true) {
 365         unsigned char chData = ser_readdata8(is);
 366         n = (n << 7) | (chData & 0x7F);
 367         if (chData & 0x80)
 368             n++;
 369         else
 370             return n;
 371     }
 372 }
 373
 374 #define FLATDATA(obj) REF(CFlatData((char*)&(obj), (char*)&(obj) + sizeof(obj)))
 375 #define VARINT(obj) REF(WrapVarInt(REF(obj)))
 376 #define LIMITED_STRING(obj,n) REF(LimitedString< n >(REF(obj)))
 377
 378 /**
 379  * Wrapper for serializing arrays and POD.
 380  */
 381 class CFlatData
 382 {
 383 protected:
 384     char* pbegin;
 385     char* pend;
 386 public:
 387     CFlatData(void* pbeginIn, void* pendIn) : pbegin((char*)pbeginIn), pend((char*)pendIn) { }
 388     template <class T, class TAl>
 389     explicit CFlatData(std::vector<T,TAl> &v)
 390     {
 391         pbegin = (char*)begin_ptr(v);
 392         pend = (char*)end_ptr(v);
 393     }
 394     char* begin() { return pbegin; }
 395     const char* begin() const { return pbegin; }
 396     char* end() { return pend; }
 397     const char* end() const { return pend; }
 398
 399     unsigned int GetSerializeSize(int, int=0) const
 400     {
 401         return pend - pbegin;
 402     }
 403
 404     template<typename Stream>
 405     void Serialize(Stream& s, int, int=0) const
 406     {
 407         s.write(pbegin, pend - pbegin);
 408     }
 409
 410     template<typename Stream>
 411     void Unserialize(Stream& s, int, int=0)
 412     {
 413         s.read(pbegin, pend - pbegin);
 414     }
 415 };
 416
 417 template<typename I>
 418 class CVarInt
 419 {
 420 protected:
 421     I &n;
 422 public:
 423     CVarInt(I& nIn) : n(nIn) { }
 424
 425     unsigned int GetSerializeSize(int, int) const {
 426         return GetSizeOfVarInt<I>(n);
 427     }
 428
 429     template<typename Stream>
 430     void Serialize(Stream &s, int, int) const {
 431         WriteVarInt<Stream,I>(s, n);
 432     }
 433
 434     template<typename Stream>
 435     void Unserialize(Stream& s, int, int) {
 436         n = ReadVarInt<Stream,I>(s);
 437     }
 438 };
 439
 440 template<size_t Limit>
 441 class LimitedString
 442 {
 443 protected:
 444     std::string& string;
 445 public:
 446     LimitedString(std::string& string) : string(string) {}
 447
 448     template<typename Stream>
 449     void Unserialize(Stream& s, int, int=0)
 450     {
 451         size_t size = ReadCompactSize(s);
 452         if (size > Limit) {
 453             throw std::ios_base::failure("String length limit exceeded");
 454         }
 455         string.resize(size);
 456         if (size != 0)
 457             s.read((char*)&string[0], size);
 458     }
 459
 460     template<typename Stream>
 461     void Serialize(Stream& s, int, int=0) const
 462     {
 463         WriteCompactSize(s, string.size());
 464         if (!string.empty())
 465             s.write((char*)&string[0], string.size());
 466     }
 467
 468     unsigned int GetSerializeSize(int, int=0) const
 469     {
 470         return GetSizeOfCompactSize(string.size()) + string.size();
 471     }
 472 };
 473
 474 template<typename I>
 475 CVarInt<I> WrapVarInt(I& n) { return CVarInt<I>(n); }
 476
 477 /**
 478  * Forward declarations
 479  */
 480
 481 /**
 482  *  string
 483  */
 484 template<typename C> unsigned int GetSerializeSize(const std::basic_string<C>& str, int, int=0);
 485 template<typename Stream, typename C> void Serialize(Stream& os, const std::basic_string<C>& str, int, int=0);
 486 template<typename Stream, typename C> void Unserialize(Stream& is, std::basic_string<C>& str, int, int=0);
 487
 488 /**
 489  * vector
 490  * vectors of unsigned char are a special case and are intended to be serialized as a single opaque blob.
 491  */
 492 template<typename T, typename A> unsigned int GetSerializeSize_impl(const std::vector<T, A>& v, int nType, int nVersion, const unsigned char&);
 493 template<typename T, typename A, typename V> unsigned int GetSerializeSize_impl(const std::vector<T, A>& v, int nType, int nVersion, const V&);
 494 template<typename T, typename A> inline unsigned int GetSerializeSize(const std::vector<T, A>& v, int nType, int nVersion);
 495 template<typename Stream, typename T, typename A> void Serialize_impl(Stream& os, const std::vector<T, A>& v, int nType, int nVersion, const unsigned char&);
 496 template<typename Stream, typename T, typename A, typename V> void Serialize_impl(Stream& os, const std::vector<T, A>& v, int nType, int nVersion, const V&);
 497 template<typename Stream, typename T, typename A> inline void Serialize(Stream& os, const std::vector<T, A>& v, int nType, int nVersion);
 498 template<typename Stream, typename T, typename A> void Unserialize_impl(Stream& is, std::vector<T, A>& v, int nType, int nVersion, const unsigned char&);
 499 template<typename Stream, typename T, typename A, typename V> void Unserialize_impl(Stream& is, std::vector<T, A>& v, int nType, int nVersion, const V&);
 500 template<typename Stream, typename T, typename A> inline void Unserialize(Stream& is, std::vector<T, A>& v, int nType, int nVersion);
 501
 502 /**
 503  * others derived from vector
 504  */
 505 extern inline unsigned int GetSerializeSize(const CScript& v, int nType, int nVersion);
 506 template<typename Stream> void Serialize(Stream& os, const CScript& v, int nType, int nVersion);
 507 template<typename Stream> void Unserialize(Stream& is, CScript& v, int nType, int nVersion);
 508
 509 /**
 510  * pair
 511  */
 512 template<typename K, typename T> unsigned int GetSerializeSize(const std::pair<K, T>& item, int nType, int nVersion);
 513 template<typename Stream, typename K, typename T> void Serialize(Stream& os, const std::pair<K, T>& item, int nType, int nVersion);
 514 template<typename Stream, typename K, typename T> void Unserialize(Stream& is, std::pair<K, T>& item, int nType, int nVersion);
 515
 516 /**
 517  * map
 518  */
 519 template<typename K, typename T, typename Pred, typename A> unsigned int GetSerializeSize(const std::map<K, T, Pred, A>& m, int nType, int nVersion);
 520 template<typename Stream, typename K, typename T, typename Pred, typename A> void Serialize(Stream& os, const std::map<K, T, Pred, A>& m, int nType, int nVersion);
 521 template<typename Stream, typename K, typename T, typename Pred, typename A> void Unserialize(Stream& is, std::map<K, T, Pred, A>& m, int nType, int nVersion);
 522
 523 /**
 524  * set
 525  */
 526 template<typename K, typename Pred, typename A> unsigned int GetSerializeSize(const std::set<K, Pred, A>& m, int nType, int nVersion);
 527 template<typename Stream, typename K, typename Pred, typename A> void Serialize(Stream& os, const std::set<K, Pred, A>& m, int nType, int nVersion);
 528 template<typename Stream, typename K, typename Pred, typename A> void Unserialize(Stream& is, std::set<K, Pred, A>& m, int nType, int nVersion);
 529
 530
 531
 532
 533
 534 /**
 535  * If none of the specialized versions above matched, default to calling member function.
 536  * "int nType" is changed to "long nType" to keep from getting an ambiguous overload error.
 537  * The compiler will only cast int to long if none of the other templates matched.
 538  * Thanks to Boost serialization for this idea.
 539  */
 540 template<typename T>
 541 inline unsigned int GetSerializeSize(const T& a, long nType, int nVersion)
 542 {
 543     return a.GetSerializeSize((int)nType, nVersion);
 544 }
 545
 546 template<typename Stream, typename T>
 547 inline void Serialize(Stream& os, const T& a, long nType, int nVersion)
 548 {
 549     a.Serialize(os, (int)nType, nVersion);
 550 }
 551
 552 template<typename Stream, typename T>
 553 inline void Unserialize(Stream& is, T& a, long nType, int nVersion)
 554 {
 555     a.Unserialize(is, (int)nType, nVersion);
 556 }
 557
 558
 559
 560
 561
 562 /**
 563  * string
 564  */
 565 template<typename C>
 566 unsigned int GetSerializeSize(const std::basic_string<C>& str, int, int)
 567 {
 568     return GetSizeOfCompactSize(str.size()) + str.size() * sizeof(str[0]);
 569 }
 570
 571 template<typename Stream, typename C>
 572 void Serialize(Stream& os, const std::basic_string<C>& str, int, int)
 573 {
 574     WriteCompactSize(os, str.size());
 575     if (!str.empty())
 576         os.write((char*)&str[0], str.size() * sizeof(str[0]));
 577 }
 578
 579 template<typename Stream, typename C>
 580 void Unserialize(Stream& is, std::basic_string<C>& str, int, int)
 581 {
 582     unsigned int nSize = ReadCompactSize(is);
 583     str.resize(nSize);
 584     if (nSize != 0)
 585         is.read((char*)&str[0], nSize * sizeof(str[0]));
 586 }
 587
 588
 589
 590 /**
 591  * vector
 592  */
 593 template<typename T, typename A>
 594 unsigned int GetSerializeSize_impl(const std::vector<T, A>& v, int nType, int nVersion, const unsigned char&)
 595 {
 596     return (GetSizeOfCompactSize(v.size()) + v.size() * sizeof(T));
 597 }
 598
 599 template<typename T, typename A, typename V>
 600 unsigned int GetSerializeSize_impl(const std::vector<T, A>& v, int nType, int nVersion, const V&)
 601 {
 602     unsigned int nSize = GetSizeOfCompactSize(v.size());
 603     for (typename std::vector<T, A>::const_iterator vi = v.begin(); vi != v.end(); ++vi)
 604         nSize += GetSerializeSize((*vi), nType, nVersion);
 605     return nSize;
 606 }
 607
 608 template<typename T, typename A>
 609 inline unsigned int GetSerializeSize(const std::vector<T, A>& v, int nType, int nVersion)
 610 {
 611     return GetSerializeSize_impl(v, nType, nVersion, T());
 612 }
 613
 614
 615 template<typename Stream, typename T, typename A>
 616 void Serialize_impl(Stream& os, const std::vector<T, A>& v, int nType, int nVersion, const unsigned char&)
 617 {
 618     WriteCompactSize(os, v.size());
 619     if (!v.empty())
 620         os.write((char*)&v[0], v.size() * sizeof(T));
 621 }
 622
 623 template<typename Stream, typename T, typename A, typename V>
 624 void Serialize_impl(Stream& os, const std::vector<T, A>& v, int nType, int nVersion, const V&)
 625 {
 626     WriteCompactSize(os, v.size());
 627     for (typename std::vector<T, A>::const_iterator vi = v.begin(); vi != v.end(); ++vi)
 628         ::Serialize(os, (*vi), nType, nVersion);
 629 }
 630
 631 template<typename Stream, typename T, typename A>
 632 inline void Serialize(Stream& os, const std::vector<T, A>& v, int nType, int nVersion)
 633 {
 634     Serialize_impl(os, v, nType, nVersion, T());
 635 }
 636
 637
 638 template<typename Stream, typename T, typename A>
 639 void Unserialize_impl(Stream& is, std::vector<T, A>& v, int nType, int nVersion, const unsigned char&)
 640 {
 641     // Limit size per read so bogus size value won't cause out of memory
 642     v.clear();
 643     unsigned int nSize = ReadCompactSize(is);
 644     unsigned int i = 0;
 645     while (i < nSize)
 646     {
 647         unsigned int blk = std::min(nSize - i, (unsigned int)(1 + 4999999 / sizeof(T)));
 648         v.resize(i + blk);
 649         is.read((char*)&v[i], blk * sizeof(T));
 650         i += blk;
 651     }
 652 }
 653
 654 template<typename Stream, typename T, typename A, typename V>
 655 void Unserialize_impl(Stream& is, std::vector<T, A>& v, int nType, int nVersion, const V&)
 656 {
 657     v.clear();
 658     unsigned int nSize = ReadCompactSize(is);
 659     unsigned int i = 0;
 660     unsigned int nMid = 0;
 661     while (nMid < nSize)
 662     {
 663         nMid += 5000000 / sizeof(T);
 664         if (nMid > nSize)
 665             nMid = nSize;
 666         v.resize(nMid);
 667         for (; i < nMid; i++)
 668             Unserialize(is, v[i], nType, nVersion);
 669     }
 670 }
 671
 672 template<typename Stream, typename T, typename A>
 673 inline void Unserialize(Stream& is, std::vector<T, A>& v, int nType, int nVersion)
 674 {
 675     Unserialize_impl(is, v, nType, nVersion, T());
 676 }
 677
 678
 679
 680 /**
 681  * others derived from vector
 682  */
 683 inline unsigned int GetSerializeSize(const CScript& v, int nType, int nVersion)
 684 {
 685     return GetSerializeSize((const std::vector<unsigned char>&)v, nType, nVersion);
 686 }
 687
 688 template<typename Stream>
 689 void Serialize(Stream& os, const CScript& v, int nType, int nVersion)
 690 {
 691     Serialize(os, (const std::vector<unsigned char>&)v, nType, nVersion);
 692 }
 693
 694 template<typename Stream>
 695 void Unserialize(Stream& is, CScript& v, int nType, int nVersion)
 696 {
 697     Unserialize(is, (std::vector<unsigned char>&)v, nType, nVersion);
 698 }
 699
 700
 701
 702 /**
 703  * pair
 704  */
 705 template<typename K, typename T>
 706 unsigned int GetSerializeSize(const std::pair<K, T>& item, int nType, int nVersion)
 707 {
 708     return GetSerializeSize(item.first, nType, nVersion) + GetSerializeSize(item.second, nType, nVersion);
 709 }
 710
 711 template<typename Stream, typename K, typename T>
 712 void Serialize(Stream& os, const std::pair<K, T>& item, int nType, int nVersion)
 713 {
 714     Serialize(os, item.first, nType, nVersion);
 715     Serialize(os, item.second, nType, nVersion);
 716 }
 717
 718 template<typename Stream, typename K, typename T>
 719 void Unserialize(Stream& is, std::pair<K, T>& item, int nType, int nVersion)
 720 {
 721     Unserialize(is, item.first, nType, nVersion);
 722     Unserialize(is, item.second, nType, nVersion);
 723 }
 724
 725
 726
 727 /**
 728  * map
 729  */
 730 template<typename K, typename T, typename Pred, typename A>
 731 unsigned int GetSerializeSize(const std::map<K, T, Pred, A>& m, int nType, int nVersion)
 732 {
 733     unsigned int nSize = GetSizeOfCompactSize(m.size());
 734     for (typename std::map<K, T, Pred, A>::const_iterator mi = m.begin(); mi != m.end(); ++mi)
 735         nSize += GetSerializeSize((*mi), nType, nVersion);
 736     return nSize;
 737 }
 738
 739 template<typename Stream, typename K, typename T, typename Pred, typename A>
 740 void Serialize(Stream& os, const std::map<K, T, Pred, A>& m, int nType, int nVersion)
 741 {
 742     WriteCompactSize(os, m.size());
 743     for (typename std::map<K, T, Pred, A>::const_iterator mi = m.begin(); mi != m.end(); ++mi)
 744         Serialize(os, (*mi), nType, nVersion);
 745 }
 746
 747 template<typename Stream, typename K, typename T, typename Pred, typename A>
 748 void Unserialize(Stream& is, std::map<K, T, Pred, A>& m, int nType, int nVersion)
 749 {
 750     m.clear();
 751     unsigned int nSize = ReadCompactSize(is);
 752     typename std::map<K, T, Pred, A>::iterator mi = m.begin();
 753     for (unsigned int i = 0; i < nSize; i++)
 754     {
 755         std::pair<K, T> item;
 756         Unserialize(is, item, nType, nVersion);
 757         mi = m.insert(mi, item);
 758     }
 759 }
 760
 761
 762
 763 /**
 764  * set
 765  */
 766 template<typename K, typename Pred, typename A>
 767 unsigned int GetSerializeSize(const std::set<K, Pred, A>& m, int nType, int nVersion)
 768 {
 769     unsigned int nSize = GetSizeOfCompactSize(m.size());
 770     for (typename std::set<K, Pred, A>::const_iterator it = m.begin(); it != m.end(); ++it)
 771         nSize += GetSerializeSize((*it), nType, nVersion);
 772     return nSize;
 773 }
 774
 775 template<typename Stream, typename K, typename Pred, typename A>
 776 void Serialize(Stream& os, const std::set<K, Pred, A>& m, int nType, int nVersion)
 777 {
 778     WriteCompactSize(os, m.size());
 779     for (typename std::set<K, Pred, A>::const_iterator it = m.begin(); it != m.end(); ++it)
 780         Serialize(os, (*it), nType, nVersion);
 781 }
 782
 783 template<typename Stream, typename K, typename Pred, typename A>
 784 void Unserialize(Stream& is, std::set<K, Pred, A>& m, int nType, int nVersion)
 785 {
 786     m.clear();
 787     unsigned int nSize = ReadCompactSize(is);
 788     typename std::set<K, Pred, A>::iterator it = m.begin();
 789     for (unsigned int i = 0; i < nSize; i++)
 790     {
 791         K key;
 792         Unserialize(is, key, nType, nVersion);
 793         it = m.insert(it, key);
 794     }
 795 }
 796
 797
 798
 799 /**
 800  * Support for ADD_SERIALIZE_METHODS and READWRITE macro
 801  */
 802 struct CSerActionSerialize
 803 {
 804     bool ForRead() const { return false; }
 805 };
 806 struct CSerActionUnserialize
 807 {
 808     bool ForRead() const { return true; }
 809 };
 810
 811 template<typename Stream, typename T>
 812 inline void SerReadWrite(Stream& s, const T& obj, int nType, int nVersion, CSerActionSerialize ser_action)
 813 {
 814     ::Serialize(s, obj, nType, nVersion);
 815 }
 816
 817 template<typename Stream, typename T>
 818 inline void SerReadWrite(Stream& s, T& obj, int nType, int nVersion, CSerActionUnserialize ser_action)
 819 {
 820     ::Unserialize(s, obj, nType, nVersion);
 821 }
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831 class CSizeComputer
 832 {
 833 protected:
 834     size_t nSize;
 835
 836 public:
 837     int nType;
 838     int nVersion;
 839
 840     CSizeComputer(int nTypeIn, int nVersionIn) : nSize(0), nType(nTypeIn), nVersion(nVersionIn) {}
 841
 842     CSizeComputer& write(const char *psz, size_t nSize)
 843     {
 844         this->nSize += nSize;
 845         return *this;
 846     }
 847
 848     template<typename T>
 849     CSizeComputer& operator<<(const T& obj)
 850     {
 851         ::Serialize(*this, obj, nType, nVersion);
 852         return (*this);
 853     }
 854
 855     size_t size() const {
 856         return nSize;
 857     }
 858 };
 859
 860 #endif // BITCOIN_SERIALIZE_H