src/util/serialize.h

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #pragma once
  21
  22 #include "irrlichttypes_bloated.h"
  23 #include "exceptions.h" // for SerializationError
  24 #include "debug.h" // for assert
  25 #include "ieee_float.h"
  26
  27 #include "config.h"
  28 #if HAVE_ENDIAN_H
  29         #ifdef _WIN32
  30                 #define __BYTE_ORDER 0
  31                 #define __LITTLE_ENDIAN 0
  32                 #define __BIG_ENDIAN 1
  33         #elif defined(__MACH__) && defined(__APPLE__)
  34                 #include <machine/endian.h>
  35         #elif defined(__FreeBSD__) || defined(__DragonFly__)
  36                 #include <sys/endian.h>
  37         #else
  38                 #include <endian.h>
  39         #endif
  40 #endif
  41 #include <cstring> // for memcpy
  42 #include <iostream>
  43 #include <string>
  44 #include <vector>
  45
  46 #define FIXEDPOINT_FACTOR 1000.0f
  47
  48 // 0x7FFFFFFF / 1000.0f is not serializable.
  49 // The limited float precision at this magnitude may cause the result to round
  50 // to a greater value than can be represented by a 32 bit integer when increased
  51 // by a factor of FIXEDPOINT_FACTOR.  As a result, [F1000_MIN..F1000_MAX] does
  52 // not represent the full range, but rather the largest safe range, of values on
  53 // all supported architectures.  Note: This definition makes assumptions on
  54 // platform float-to-int conversion behavior.
  55 #define F1000_MIN ((float)(s32)((float)(-0x7FFFFFFF - 1) / FIXEDPOINT_FACTOR))
  56 #define F1000_MAX ((float)(s32)((float)(0x7FFFFFFF) / FIXEDPOINT_FACTOR))
  57
  58 #define STRING_MAX_LEN 0xFFFF
  59 #define WIDE_STRING_MAX_LEN 0xFFFF
  60 // 64 MB ought to be enough for anybody - Billy G.
  61 #define LONG_STRING_MAX_LEN (64 * 1024 * 1024)
  62
  63
  64 extern FloatType g_serialize_f32_type;
  65
  66 #if HAVE_ENDIAN_H
  67 // use machine native byte swapping routines
  68 // Note: memcpy below is optimized out by modern compilers
  69
  70 inline u16 readU16(const u8 *data)
  71 {
  72         u16 val;
  73         memcpy(&val, data, 2);
  74         return be16toh(val);
  75 }
  76
  77 inline u32 readU32(const u8 *data)
  78 {
  79         u32 val;
  80         memcpy(&val, data, 4);
  81         return be32toh(val);
  82 }
  83
  84 inline u64 readU64(const u8 *data)
  85 {
  86         u64 val;
  87         memcpy(&val, data, 8);
  88         return be64toh(val);
  89 }
  90
  91 inline void writeU16(u8 *data, u16 i)
  92 {
  93         u16 val = htobe16(i);
  94         memcpy(data, &val, 2);
  95 }
  96
  97 inline void writeU32(u8 *data, u32 i)
  98 {
  99         u32 val = htobe32(i);
 100         memcpy(data, &val, 4);
 101 }
 102
 103 inline void writeU64(u8 *data, u64 i)
 104 {
 105         u64 val = htobe64(i);
 106         memcpy(data, &val, 8);
 107 }
 108
 109 #else
 110 // generic byte-swapping implementation
 111
 112 inline u16 readU16(const u8 *data)
 113 {
 114         return
 115                 ((u16)data[0] << 8) | ((u16)data[1] << 0);
 116 }
 117
 118 inline u32 readU32(const u8 *data)
 119 {
 120         return
 121                 ((u32)data[0] << 24) | ((u32)data[1] << 16) |
 122                 ((u32)data[2] <<  8) | ((u32)data[3] <<  0);
 123 }
 124
 125 inline u64 readU64(const u8 *data)
 126 {
 127         return
 128                 ((u64)data[0] << 56) | ((u64)data[1] << 48) |
 129                 ((u64)data[2] << 40) | ((u64)data[3] << 32) |
 130                 ((u64)data[4] << 24) | ((u64)data[5] << 16) |
 131                 ((u64)data[6] <<  8) | ((u64)data[7] << 0);
 132 }
 133
 134 inline void writeU16(u8 *data, u16 i)
 135 {
 136         data[0] = (i >> 8) & 0xFF;
 137         data[1] = (i >> 0) & 0xFF;
 138 }
 139
 140 inline void writeU32(u8 *data, u32 i)
 141 {
 142         data[0] = (i >> 24) & 0xFF;
 143         data[1] = (i >> 16) & 0xFF;
 144         data[2] = (i >>  8) & 0xFF;
 145         data[3] = (i >>  0) & 0xFF;
 146 }
 147
 148 inline void writeU64(u8 *data, u64 i)
 149 {
 150         data[0] = (i >> 56) & 0xFF;
 151         data[1] = (i >> 48) & 0xFF;
 152         data[2] = (i >> 40) & 0xFF;
 153         data[3] = (i >> 32) & 0xFF;
 154         data[4] = (i >> 24) & 0xFF;
 155         data[5] = (i >> 16) & 0xFF;
 156         data[6] = (i >>  8) & 0xFF;
 157         data[7] = (i >>  0) & 0xFF;
 158 }
 159
 160 #endif // HAVE_ENDIAN_H
 161
 162 //////////////// read routines ////////////////
 163
 164 inline u8 readU8(const u8 *data)
 165 {
 166         return ((u8)data[0] << 0);
 167 }
 168
 169 inline s8 readS8(const u8 *data)
 170 {
 171         return (s8)readU8(data);
 172 }
 173
 174 inline s16 readS16(const u8 *data)
 175 {
 176         return (s16)readU16(data);
 177 }
 178
 179 inline s32 readS32(const u8 *data)
 180 {
 181         return (s32)readU32(data);
 182 }
 183
 184 inline s64 readS64(const u8 *data)
 185 {
 186         return (s64)readU64(data);
 187 }
 188
 189 inline f32 readF1000(const u8 *data)
 190 {
 191         return (f32)readS32(data) / FIXEDPOINT_FACTOR;
 192 }
 193
 194 inline f32 readF32(const u8 *data)
 195 {
 196         u32 u = readU32(data);
 197
 198         switch (g_serialize_f32_type) {
 199         case FLOATTYPE_SYSTEM: {
 200                         f32 f;
 201                         memcpy(&f, &u, 4);
 202                         return f;
 203                 }
 204         case FLOATTYPE_SLOW:
 205                 return u32Tof32Slow(u);
 206         case FLOATTYPE_UNKNOWN: // First initialization
 207                 g_serialize_f32_type = getFloatSerializationType();
 208                 return readF32(data);
 209         }
 210         throw SerializationError("readF32: Unreachable code");
 211 }
 212
 213 inline video::SColor readARGB8(const u8 *data)
 214 {
 215         video::SColor p(readU32(data));
 216         return p;
 217 }
 218
 219 inline v2s16 readV2S16(const u8 *data)
 220 {
 221         v2s16 p;
 222         p.X = readS16(&data[0]);
 223         p.Y = readS16(&data[2]);
 224         return p;
 225 }
 226
 227 inline v3s16 readV3S16(const u8 *data)
 228 {
 229         v3s16 p;
 230         p.X = readS16(&data[0]);
 231         p.Y = readS16(&data[2]);
 232         p.Z = readS16(&data[4]);
 233         return p;
 234 }
 235
 236 inline v2s32 readV2S32(const u8 *data)
 237 {
 238         v2s32 p;
 239         p.X = readS32(&data[0]);
 240         p.Y = readS32(&data[4]);
 241         return p;
 242 }
 243
 244 inline v3s32 readV3S32(const u8 *data)
 245 {
 246         v3s32 p;
 247         p.X = readS32(&data[0]);
 248         p.Y = readS32(&data[4]);
 249         p.Z = readS32(&data[8]);
 250         return p;
 251 }
 252
 253 inline v3f readV3F1000(const u8 *data)
 254 {
 255         v3f p;
 256         p.X = readF1000(&data[0]);
 257         p.Y = readF1000(&data[4]);
 258         p.Z = readF1000(&data[8]);
 259         return p;
 260 }
 261
 262 inline v2f readV2F32(const u8 *data)
 263 {
 264         v2f p;
 265         p.X = readF32(&data[0]);
 266         p.Y = readF32(&data[4]);
 267         return p;
 268 }
 269
 270 inline v3f readV3F32(const u8 *data)
 271 {
 272         v3f p;
 273         p.X = readF32(&data[0]);
 274         p.Y = readF32(&data[4]);
 275         p.Z = readF32(&data[8]);
 276         return p;
 277 }
 278
 279 /////////////// write routines ////////////////
 280
 281 inline void writeU8(u8 *data, u8 i)
 282 {
 283         data[0] = (i >> 0) & 0xFF;
 284 }
 285
 286 inline void writeS8(u8 *data, s8 i)
 287 {
 288         writeU8(data, (u8)i);
 289 }
 290
 291 inline void writeS16(u8 *data, s16 i)
 292 {
 293         writeU16(data, (u16)i);
 294 }
 295
 296 inline void writeS32(u8 *data, s32 i)
 297 {
 298         writeU32(data, (u32)i);
 299 }
 300
 301 inline void writeS64(u8 *data, s64 i)
 302 {
 303         writeU64(data, (u64)i);
 304 }
 305
 306 inline void writeF1000(u8 *data, f32 i)
 307 {
 308         assert(i >= F1000_MIN && i <= F1000_MAX);
 309         writeS32(data, i * FIXEDPOINT_FACTOR);
 310 }
 311
 312 inline void writeF32(u8 *data, f32 i)
 313 {
 314         switch (g_serialize_f32_type) {
 315         case FLOATTYPE_SYSTEM: {
 316                         u32 u;
 317                         memcpy(&u, &i, 4);
 318                         return writeU32(data, u);
 319                 }
 320         case FLOATTYPE_SLOW:
 321                 return writeU32(data, f32Tou32Slow(i));
 322         case FLOATTYPE_UNKNOWN: // First initialization
 323                 g_serialize_f32_type = getFloatSerializationType();
 324                 return writeF32(data, i);
 325         }
 326         throw SerializationError("writeF32: Unreachable code");
 327 }
 328
 329 inline void writeARGB8(u8 *data, video::SColor p)
 330 {
 331         writeU32(data, p.color);
 332 }
 333
 334 inline void writeV2S16(u8 *data, v2s16 p)
 335 {
 336         writeS16(&data[0], p.X);
 337         writeS16(&data[2], p.Y);
 338 }
 339
 340 inline void writeV3S16(u8 *data, v3s16 p)
 341 {
 342         writeS16(&data[0], p.X);
 343         writeS16(&data[2], p.Y);
 344         writeS16(&data[4], p.Z);
 345 }
 346
 347 inline void writeV2S32(u8 *data, v2s32 p)
 348 {
 349         writeS32(&data[0], p.X);
 350         writeS32(&data[4], p.Y);
 351 }
 352
 353 inline void writeV3S32(u8 *data, v3s32 p)
 354 {
 355         writeS32(&data[0], p.X);
 356         writeS32(&data[4], p.Y);
 357         writeS32(&data[8], p.Z);
 358 }
 359
 360 inline void writeV3F1000(u8 *data, v3f p)
 361 {
 362         writeF1000(&data[0], p.X);
 363         writeF1000(&data[4], p.Y);
 364         writeF1000(&data[8], p.Z);
 365 }
 366
 367 inline void writeV2F32(u8 *data, v2f p)
 368 {
 369         writeF32(&data[0], p.X);
 370         writeF32(&data[4], p.Y);
 371 }
 372
 373 inline void writeV3F32(u8 *data, v3f p)
 374 {
 375         writeF32(&data[0], p.X);
 376         writeF32(&data[4], p.Y);
 377         writeF32(&data[8], p.Z);
 378 }
 379
 380 ////
 381 //// Iostream wrapper for data read/write
 382 ////
 383
 384 #define MAKE_STREAM_READ_FXN(T, N, S)    \
 385         inline T read ## N(std::istream &is) \
 386         {                                    \
 387                 char buf[S] = {0};               \
 388                 is.read(buf, sizeof(buf));       \
 389                 return read ## N((u8 *)buf);     \
 390         }
 391
 392 #define MAKE_STREAM_WRITE_FXN(T, N, S)              \
 393         inline void write ## N(std::ostream &os, T val) \
 394         {                                               \
 395                 char buf[S];                                \
 396                 write ## N((u8 *)buf, val);                 \
 397                 os.write(buf, sizeof(buf));                 \
 398         }
 399
 400 MAKE_STREAM_READ_FXN(u8,    U8,       1);
 401 MAKE_STREAM_READ_FXN(u16,   U16,      2);
 402 MAKE_STREAM_READ_FXN(u32,   U32,      4);
 403 MAKE_STREAM_READ_FXN(u64,   U64,      8);
 404 MAKE_STREAM_READ_FXN(s8,    S8,       1);
 405 MAKE_STREAM_READ_FXN(s16,   S16,      2);
 406 MAKE_STREAM_READ_FXN(s32,   S32,      4);
 407 MAKE_STREAM_READ_FXN(s64,   S64,      8);
 408 MAKE_STREAM_READ_FXN(f32,   F1000,    4);
 409 MAKE_STREAM_READ_FXN(f32,   F32,      4);
 410 MAKE_STREAM_READ_FXN(v2s16, V2S16,    4);
 411 MAKE_STREAM_READ_FXN(v3s16, V3S16,    6);
 412 MAKE_STREAM_READ_FXN(v2s32, V2S32,    8);
 413 MAKE_STREAM_READ_FXN(v3s32, V3S32,   12);
 414 MAKE_STREAM_READ_FXN(v3f,   V3F1000, 12);
 415 MAKE_STREAM_READ_FXN(v2f,   V2F32,    8);
 416 MAKE_STREAM_READ_FXN(v3f,   V3F32,   12);
 417 MAKE_STREAM_READ_FXN(video::SColor, ARGB8, 4);
 418
 419 MAKE_STREAM_WRITE_FXN(u8,    U8,       1);
 420 MAKE_STREAM_WRITE_FXN(u16,   U16,      2);
 421 MAKE_STREAM_WRITE_FXN(u32,   U32,      4);
 422 MAKE_STREAM_WRITE_FXN(u64,   U64,      8);
 423 MAKE_STREAM_WRITE_FXN(s8,    S8,       1);
 424 MAKE_STREAM_WRITE_FXN(s16,   S16,      2);
 425 MAKE_STREAM_WRITE_FXN(s32,   S32,      4);
 426 MAKE_STREAM_WRITE_FXN(s64,   S64,      8);
 427 MAKE_STREAM_WRITE_FXN(f32,   F1000,    4);
 428 MAKE_STREAM_WRITE_FXN(f32,   F32,      4);
 429 MAKE_STREAM_WRITE_FXN(v2s16, V2S16,    4);
 430 MAKE_STREAM_WRITE_FXN(v3s16, V3S16,    6);
 431 MAKE_STREAM_WRITE_FXN(v2s32, V2S32,    8);
 432 MAKE_STREAM_WRITE_FXN(v3s32, V3S32,   12);
 433 MAKE_STREAM_WRITE_FXN(v3f,   V3F1000, 12);
 434 MAKE_STREAM_WRITE_FXN(v2f,   V2F32,    8);
 435 MAKE_STREAM_WRITE_FXN(v3f,   V3F32,   12);
 436 MAKE_STREAM_WRITE_FXN(video::SColor, ARGB8, 4);
 437
 438 ////
 439 //// More serialization stuff
 440 ////
 441
 442 // Creates a string with the length as the first two bytes
 443 std::string serializeString16(const std::string &plain);
 444
 445 // Reads a string with the length as the first two bytes
 446 std::string deSerializeString16(std::istream &is);
 447
 448 // Creates a string with the length as the first four bytes
 449 std::string serializeString32(const std::string &plain);
 450
 451 // Reads a string with the length as the first four bytes
 452 std::string deSerializeString32(std::istream &is);
 453
 454 // Creates a string encoded in JSON format (almost equivalent to a C string literal)
 455 std::string serializeJsonString(const std::string &plain);
 456
 457 // Reads a string encoded in JSON format
 458 std::string deSerializeJsonString(std::istream &is);
 459
 460 // If the string contains spaces, quotes or control characters, encodes as JSON.
 461 // Else returns the string unmodified.
 462 std::string serializeJsonStringIfNeeded(const std::string &s);
 463
 464 // Parses a string serialized by serializeJsonStringIfNeeded.
 465 std::string deSerializeJsonStringIfNeeded(std::istream &is);