Alc/helpers.c

   1 /**
   2  * OpenAL cross platform audio library
   3  * Copyright (C) 2011 by authors.
   4  * This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Library General Public
   6  *  License as published by the Free Software Foundation; either
   7  *  version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *  Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  *  License along with this library; if not, write to the
  16  *  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  *  Boston, MA  02111-1307, USA.
  18  * Or go to http://www.gnu.org/copyleft/lgpl.html
  19  */
  20
  21 #ifdef _WIN32
  22 #ifdef __MINGW32__
  23 #define _WIN32_IE 0x501
  24 #else
  25 #define _WIN32_IE 0x400
  26 #endif
  27 #endif
  28
  29 #include "config.h"
  30
  31 #include <stdlib.h>
  32 #include <time.h>
  33 #include <errno.h>
  34 #include <stdarg.h>
  35 #ifdef HAVE_MALLOC_H
  36 #include <malloc.h>
  37 #endif
  38
  39 #ifndef AL_NO_UID_DEFS
  40 #if defined(HAVE_GUIDDEF_H) || defined(HAVE_INITGUID_H)
  41 #define INITGUID
  42 #include <windows.h>
  43 #ifdef HAVE_GUIDDEF_H
  44 #include <guiddef.h>
  45 #else
  46 #include <initguid.h>
  47 #endif
  48
  49 DEFINE_GUID(KSDATAFORMAT_SUBTYPE_PCM,        0x00000001, 0x0000, 0x0010, 0x80,0x00, 0x00,0xaa,0x00,0x38,0x9b,0x71);
  50 DEFINE_GUID(KSDATAFORMAT_SUBTYPE_IEEE_FLOAT, 0x00000003, 0x0000, 0x0010, 0x80,0x00, 0x00,0xaa,0x00,0x38,0x9b,0x71);
  51
  52 DEFINE_GUID(IID_IDirectSoundNotify,   0xb0210783, 0x89cd, 0x11d0, 0xaf,0x08, 0x00,0xa0,0xc9,0x25,0xcd,0x16);
  53
  54 DEFINE_GUID(CLSID_MMDeviceEnumerator, 0xbcde0395, 0xe52f, 0x467c, 0x8e,0x3d, 0xc4,0x57,0x92,0x91,0x69,0x2e);
  55 DEFINE_GUID(IID_IMMDeviceEnumerator,  0xa95664d2, 0x9614, 0x4f35, 0xa7,0x46, 0xde,0x8d,0xb6,0x36,0x17,0xe6);
  56 DEFINE_GUID(IID_IAudioClient,         0x1cb9ad4c, 0xdbfa, 0x4c32, 0xb1,0x78, 0xc2,0xf5,0x68,0xa7,0x03,0xb2);
  57 DEFINE_GUID(IID_IAudioRenderClient,   0xf294acfc, 0x3146, 0x4483, 0xa7,0xbf, 0xad,0xdc,0xa7,0xc2,0x60,0xe2);
  58
  59 #ifdef HAVE_MMDEVAPI
  60 #include <devpropdef.h>
  61 DEFINE_DEVPROPKEY(DEVPKEY_Device_FriendlyName, 0xa45c254e, 0xdf1c, 0x4efd, 0x80,0x20, 0x67,0xd1,0x46,0xa8,0x50,0xe0, 14);
  62 #endif
  63 #endif
  64 #endif /* AL_NO_UID_DEFS */
  65
  66 #ifdef HAVE_DLFCN_H
  67 #include <dlfcn.h>
  68 #endif
  69 #ifdef HAVE_CPUID_H
  70 #include <cpuid.h>
  71 #endif
  72 #ifdef HAVE_SYS_SYSCONF_H
  73 #include <sys/sysconf.h>
  74 #endif
  75 #ifdef HAVE_FLOAT_H
  76 #include <float.h>
  77 #endif
  78 #ifdef HAVE_IEEEFP_H
  79 #include <ieeefp.h>
  80 #endif
  81
  82 #ifdef _WIN32_IE
  83 #include <shlobj.h>
  84 #endif
  85
  86 #include "alMain.h"
  87 #include "alu.h"
  88 #include "atomic.h"
  89 #include "uintmap.h"
  90 #include "vector.h"
  91 #include "alstring.h"
  92 #include "compat.h"
  93 #include "threads.h"
  94
  95
  96 extern inline ALuint NextPowerOf2(ALuint value);
  97 extern inline ALint fastf2i(ALfloat f);
  98 extern inline ALuint fastf2u(ALfloat f);
  99
 100
 101 ALuint CPUCapFlags = 0;
 102
 103
 104 void FillCPUCaps(ALuint capfilter)
 105 {
 106     ALuint caps = 0;
 107
 108 /* FIXME: We really should get this for all available CPUs in case different
 109  * CPUs have different caps (is that possible on one machine?). */
 110 #if defined(HAVE_CPUID_H) && (defined(__i386__) || defined(__x86_64__) || \
 111                               defined(_M_IX86) || defined(_M_X64))
 112     union {
 113         unsigned int regs[4];
 114         char str[sizeof(unsigned int[4])];
 115     } cpuinf[3];
 116
 117     if(!__get_cpuid(0, &cpuinf[0].regs[0], &cpuinf[0].regs[1], &cpuinf[0].regs[2], &cpuinf[0].regs[3]))
 118         ERR("Failed to get CPUID\n");
 119     else
 120     {
 121         unsigned int maxfunc = cpuinf[0].regs[0];
 122         unsigned int maxextfunc = 0;
 123
 124         if(__get_cpuid(0x80000000, &cpuinf[0].regs[0], &cpuinf[0].regs[1], &cpuinf[0].regs[2], &cpuinf[0].regs[3]))
 125             maxextfunc = cpuinf[0].regs[0];
 126         TRACE("Detected max CPUID function: 0x%x (ext. 0x%x)\n", maxfunc, maxextfunc);
 127
 128         TRACE("Vendor ID: \"%.4s%.4s%.4s\"\n", cpuinf[0].str+4, cpuinf[0].str+12, cpuinf[0].str+8);
 129         if(maxextfunc >= 0x80000004 &&
 130            __get_cpuid(0x80000002, &cpuinf[0].regs[0], &cpuinf[0].regs[1], &cpuinf[0].regs[2], &cpuinf[0].regs[3]) &&
 131            __get_cpuid(0x80000003, &cpuinf[1].regs[0], &cpuinf[1].regs[1], &cpuinf[1].regs[2], &cpuinf[1].regs[3]) &&
 132            __get_cpuid(0x80000004, &cpuinf[2].regs[0], &cpuinf[2].regs[1], &cpuinf[2].regs[2], &cpuinf[2].regs[3]))
 133             TRACE("Name: \"%.16s%.16s%.16s\"\n", cpuinf[0].str, cpuinf[1].str, cpuinf[2].str);
 134
 135         if(maxfunc >= 1 &&
 136            __get_cpuid(1, &cpuinf[0].regs[0], &cpuinf[0].regs[1], &cpuinf[0].regs[2], &cpuinf[0].regs[3]))
 137         {
 138             if((cpuinf[0].regs[3]&(1<<25)))
 139             {
 140                 caps |= CPU_CAP_SSE;
 141                 if((cpuinf[0].regs[3]&(1<<26)))
 142                     caps |= CPU_CAP_SSE2;
 143             }
 144         }
 145     }
 146 #elif defined(HAVE_WINDOWS_H)
 147     HMODULE k32 = GetModuleHandleA("kernel32.dll");
 148     BOOL (WINAPI*IsProcessorFeaturePresent)(DWORD ProcessorFeature);
 149     IsProcessorFeaturePresent = (BOOL(WINAPI*)(DWORD))GetProcAddress(k32, "IsProcessorFeaturePresent");
 150     if(!IsProcessorFeaturePresent)
 151         ERR("IsProcessorFeaturePresent not available; CPU caps not detected\n");
 152     else
 153     {
 154         if(IsProcessorFeaturePresent(PF_XMMI_INSTRUCTIONS_AVAILABLE))
 155         {
 156             caps |= CPU_CAP_SSE;
 157             if(IsProcessorFeaturePresent(PF_XMMI64_INSTRUCTIONS_AVAILABLE))
 158                 caps |= CPU_CAP_SSE2;
 159         }
 160     }
 161 #endif
 162 #ifdef HAVE_NEON
 163     /* Assume Neon support if compiled with it */
 164     caps |= CPU_CAP_NEON;
 165 #endif
 166
 167     TRACE("Got caps:%s%s%s%s\n", ((caps&CPU_CAP_SSE)?((capfilter&CPU_CAP_SSE)?" SSE":" (SSE)"):""),
 168                                  ((caps&CPU_CAP_SSE2)?((capfilter&CPU_CAP_SSE2)?" SSE2":" (SSE2)"):""),
 169                                  ((caps&CPU_CAP_NEON)?((capfilter&CPU_CAP_NEON)?" Neon":" (Neon)"):""),
 170                                  ((!caps)?" -none-":""));
 171     CPUCapFlags = caps & capfilter;
 172 }
 173
 174
 175 void *al_malloc(size_t alignment, size_t size)
 176 {
 177 #if defined(HAVE_ALIGNED_ALLOC)
 178     size = (size+(alignment-1))&~(alignment-1);
 179     return aligned_alloc(alignment, size);
 180 #elif defined(HAVE_POSIX_MEMALIGN)
 181     void *ret;
 182     if(posix_memalign(&ret, alignment, size) == 0)
 183         return ret;
 184     return NULL;
 185 #elif defined(HAVE__ALIGNED_MALLOC)
 186     return _aligned_malloc(size, alignment);
 187 #else
 188     char *ret = malloc(size+alignment);
 189     if(ret != NULL)
 190     {
 191         *(ret++) = 0x00;
 192         while(((ALintptrEXT)ret&(alignment-1)) != 0)
 193             *(ret++) = 0x55;
 194     }
 195     return ret;
 196 #endif
 197 }
 198
 199 void *al_calloc(size_t alignment, size_t size)
 200 {
 201     void *ret = al_malloc(alignment, size);
 202     if(ret) memset(ret, 0, size);
 203     return ret;
 204 }
 205
 206 void al_free(void *ptr)
 207 {
 208 #if defined(HAVE_ALIGNED_ALLOC) || defined(HAVE_POSIX_MEMALIGN)
 209     free(ptr);
 210 #elif defined(HAVE__ALIGNED_MALLOC)
 211     _aligned_free(ptr);
 212 #else
 213     if(ptr != NULL)
 214     {
 215         char *finder = ptr;
 216         do {
 217             --finder;
 218         } while(*finder == 0x55);
 219         free(finder);
 220     }
 221 #endif
 222 }
 223
 224
 225 #if (defined(HAVE___CONTROL87_2) || defined(HAVE__CONTROLFP)) && (defined(__x86_64__) || defined(_M_X64))
 226 /* Win64 doesn't allow us to set the precision control. */
 227 #undef _MCW_PC
 228 #define _MCW_PC 0
 229 #endif
 230
 231 void SetMixerFPUMode(FPUCtl *ctl)
 232 {
 233 #ifdef HAVE_FENV_H
 234     fegetenv(STATIC_CAST(fenv_t, ctl));
 235 #if defined(__GNUC__) && defined(HAVE_SSE)
 236     if((CPUCapFlags&CPU_CAP_SSE))
 237         __asm__ __volatile__("stmxcsr %0" : "=m" (*&ctl->sse_state));
 238 #endif
 239
 240 #ifdef FE_TOWARDZERO
 241     fesetround(FE_TOWARDZERO);
 242 #endif
 243 #if defined(__GNUC__) && defined(HAVE_SSE)
 244     if((CPUCapFlags&CPU_CAP_SSE))
 245     {
 246         int sseState = ctl->sse_state;
 247         sseState |= 0x6000; /* set round-to-zero */
 248         sseState |= 0x8000; /* set flush-to-zero */
 249         if((CPUCapFlags&CPU_CAP_SSE2))
 250             sseState |= 0x0040; /* set denormals-are-zero */
 251         __asm__ __volatile__("ldmxcsr %0" : : "m" (*&sseState));
 252     }
 253 #endif
 254
 255 #elif defined(HAVE___CONTROL87_2)
 256
 257     int mode;
 258     __control87_2(0, 0, &ctl->state, NULL);
 259     __control87_2(_RC_CHOP|_PC_24, _MCW_RC|_MCW_PC, &mode, NULL);
 260 #ifdef HAVE_SSE
 261     if((CPUCapFlags&CPU_CAP_SSE))
 262     {
 263         __control87_2(0, 0, NULL, &ctl->sse_state);
 264         __control87_2(_RC_CHOP|_DN_FLUSH, _MCW_RC|_MCW_DN, NULL, &mode);
 265     }
 266 #endif
 267
 268 #elif defined(HAVE__CONTROLFP)
 269
 270     ctl->state = _controlfp(0, 0);
 271     (void)_controlfp(_RC_CHOP|_PC_24, _MCW_RC|_MCW_PC);
 272 #endif
 273 }
 274
 275 void RestoreFPUMode(const FPUCtl *ctl)
 276 {
 277 #ifdef HAVE_FENV_H
 278     fesetenv(STATIC_CAST(fenv_t, ctl));
 279 #if defined(__GNUC__) && defined(HAVE_SSE)
 280     if((CPUCapFlags&CPU_CAP_SSE))
 281         __asm__ __volatile__("ldmxcsr %0" : : "m" (*&ctl->sse_state));
 282 #endif
 283
 284 #elif defined(HAVE___CONTROL87_2)
 285
 286     int mode;
 287     __control87_2(ctl->state, _MCW_RC|_MCW_PC, &mode, NULL);
 288 #ifdef HAVE_SSE
 289     if((CPUCapFlags&CPU_CAP_SSE))
 290         __control87_2(ctl->sse_state, _MCW_RC|_MCW_DN, NULL, &mode);
 291 #endif
 292
 293 #elif defined(HAVE__CONTROLFP)
 294
 295     _controlfp(ctl->state, _MCW_RC|_MCW_PC);
 296 #endif
 297 }
 298
 299
 300 #ifdef _WIN32
 301
 302 static WCHAR *FromUTF8(const char *str)
 303 {
 304     WCHAR *out = NULL;
 305     int len;
 306
 307     if((len=MultiByteToWideChar(CP_UTF8, 0, str, -1, NULL, 0)) > 0)
 308     {
 309         out = calloc(sizeof(WCHAR), len);
 310         MultiByteToWideChar(CP_UTF8, 0, str, -1, out, len);
 311     }
 312     return out;
 313 }
 314
 315
 316 void *LoadLib(const char *name)
 317 {
 318     HANDLE hdl = NULL;
 319     WCHAR *wname;
 320
 321     wname = FromUTF8(name);
 322     if(!wname)
 323         ERR("Failed to convert UTF-8 filename: \"%s\"\n", name);
 324     else
 325     {
 326         hdl = LoadLibraryW(wname);
 327         free(wname);
 328     }
 329     return hdl;
 330 }
 331 void CloseLib(void *handle)
 332 { FreeLibrary((HANDLE)handle); }
 333 void *GetSymbol(void *handle, const char *name)
 334 {
 335     void *ret;
 336
 337     ret = (void*)GetProcAddress((HANDLE)handle, name);
 338     if(ret == NULL)
 339         ERR("Failed to load %s\n", name);
 340     return ret;
 341 }
 342
 343 WCHAR *strdupW(const WCHAR *str)
 344 {
 345     const WCHAR *n;
 346     WCHAR *ret;
 347     size_t len;
 348
 349     n = str;
 350     while(*n) n++;
 351     len = n - str;
 352
 353     ret = calloc(sizeof(WCHAR), len+1);
 354     if(ret != NULL)
 355         memcpy(ret, str, sizeof(WCHAR)*len);
 356     return ret;
 357 }
 358
 359 FILE *al_fopen(const char *fname, const char *mode)
 360 {
 361     WCHAR *wname=NULL, *wmode=NULL;
 362     FILE *file = NULL;
 363
 364     wname = FromUTF8(fname);
 365     wmode = FromUTF8(mode);
 366     if(!wname)
 367         ERR("Failed to convert UTF-8 filename: \"%s\"\n", fname);
 368     else if(!wmode)
 369         ERR("Failed to convert UTF-8 mode: \"%s\"\n", mode);
 370     else
 371         file = _wfopen(wname, wmode);
 372
 373     free(wname);
 374     free(wmode);
 375
 376     return file;
 377 }
 378
 379 #else
 380
 381 #ifdef HAVE_DLFCN_H
 382
 383 void *LoadLib(const char *name)
 384 {
 385     const char *err;
 386     void *handle;
 387
 388     dlerror();
 389     handle = dlopen(name, RTLD_NOW);
 390     if((err=dlerror()) != NULL)
 391         handle = NULL;
 392     return handle;
 393 }
 394 void CloseLib(void *handle)
 395 { dlclose(handle); }
 396 void *GetSymbol(void *handle, const char *name)
 397 {
 398     const char *err;
 399     void *sym;
 400
 401     dlerror();
 402     sym = dlsym(handle, name);
 403     if((err=dlerror()) != NULL)
 404     {
 405         WARN("Failed to load %s: %s\n", name, err);
 406         sym = NULL;
 407     }
 408     return sym;
 409 }
 410
 411 #endif
 412 #endif
 413
 414
 415 void al_print(const char *type, const char *func, const char *fmt, ...)
 416 {
 417     va_list ap;
 418
 419     va_start(ap, fmt);
 420     fprintf(LogFile, "AL lib: %s %s: ", type, func);
 421     vfprintf(LogFile, fmt, ap);
 422     va_end(ap);
 423
 424     fflush(LogFile);
 425 }
 426
 427 #ifdef _WIN32
 428 static inline int is_slash(int c)
 429 { return (c == '\\' || c == '/'); }
 430
 431 FILE *OpenDataFile(const char *fname, const char *subdir)
 432 {
 433     static const int ids[2] = { CSIDL_APPDATA, CSIDL_COMMON_APPDATA };
 434     WCHAR *wname=NULL, *wsubdir=NULL;
 435     int i;
 436
 437     /* If the path is absolute, open it directly. */
 438     if(fname[0] != '\0' && fname[1] == ':' && is_slash(fname[2]))
 439     {
 440         FILE *f;
 441         if((f=al_fopen(fname, "rb")) != NULL)
 442         {
 443             TRACE("Opened %s\n", fname);
 444             return f;
 445         }
 446         WARN("Could not open %s\n", fname);
 447         return NULL;
 448     }
 449
 450     wname = FromUTF8(fname);
 451     wsubdir = FromUTF8(subdir);
 452     if(!wname)
 453         ERR("Failed to convert UTF-8 filename: \"%s\"\n", fname);
 454     else if(!wsubdir)
 455         ERR("Failed to convert UTF-8 subdir: \"%s\"\n", subdir);
 456     else for(i = 0;i < 2;i++)
 457     {
 458         WCHAR buffer[PATH_MAX];
 459         size_t len;
 460         FILE *f;
 461
 462         if(SHGetSpecialFolderPathW(NULL, buffer, ids[i], FALSE) == FALSE)
 463             continue;
 464
 465         len = lstrlenW(buffer);
 466         if(len > 0 && is_slash(buffer[len-1]))
 467             buffer[--len] = '\0';
 468         _snwprintf(buffer+len, PATH_MAX-len, L"/%ls/%ls", wsubdir, wname);
 469         len = lstrlenW(buffer);
 470         while(len > 0)
 471         {
 472             --len;
 473             if(buffer[len] == '/')
 474                 buffer[len] = '\\';
 475         }
 476
 477         if((f=_wfopen(buffer, L"rb")) != NULL)
 478         {
 479             TRACE("Opened %ls\n", buffer);
 480             return f;
 481         }
 482         WARN("Could not open %ls\n", buffer);
 483     }
 484     free(wname);
 485     free(wsubdir);
 486
 487     return NULL;
 488 }
 489 #else
 490 FILE *OpenDataFile(const char *fname, const char *subdir)
 491 {
 492     char buffer[PATH_MAX] = "";
 493     const char *str, *next;
 494     FILE *f;
 495
 496     if(fname[0] == '/')
 497     {
 498         if((f=al_fopen(fname, "rb")) != NULL)
 499         {
 500             TRACE("Opened %s\n", fname);
 501             return f;
 502         }
 503         WARN("Could not open %s\n", fname);
 504         return NULL;
 505     }
 506
 507     if((str=getenv("XDG_DATA_HOME")) != NULL && str[0] != '\0')
 508         snprintf(buffer, sizeof(buffer), "%s/%s/%s", str, subdir, fname);
 509     else if((str=getenv("HOME")) != NULL && str[0] != '\0')
 510         snprintf(buffer, sizeof(buffer), "%s/.local/share/%s/%s", str, subdir, fname);
 511     if(buffer[0])
 512     {
 513         if((f=al_fopen(buffer, "rb")) != NULL)
 514         {
 515             TRACE("Opened %s\n", buffer);
 516             return f;
 517         }
 518         WARN("Could not open %s\n", buffer);
 519     }
 520
 521     if((str=getenv("XDG_DATA_DIRS")) == NULL || str[0] == '\0')
 522         str = "/usr/local/share/:/usr/share/";
 523
 524     next = str;
 525     while((str=next) != NULL && str[0] != '\0')
 526     {
 527         size_t len;
 528         next = strchr(str, ':');
 529
 530         if(!next)
 531             len = strlen(str);
 532         else
 533         {
 534             len = next - str;
 535             next++;
 536         }
 537
 538         if(len > sizeof(buffer)-1)
 539             len = sizeof(buffer)-1;
 540         strncpy(buffer, str, len);
 541         buffer[len] = '\0';
 542         snprintf(buffer+len, sizeof(buffer)-len, "/%s/%s", subdir, fname);
 543
 544         if((f=al_fopen(buffer, "rb")) != NULL)
 545         {
 546             TRACE("Opened %s\n", buffer);
 547             return f;
 548         }
 549         WARN("Could not open %s\n", buffer);
 550     }
 551
 552     return NULL;
 553 }
 554 #endif
 555
 556
 557 void SetRTPriority(void)
 558 {
 559     ALboolean failed = AL_FALSE;
 560
 561 #ifdef _WIN32
 562     if(RTPrioLevel > 0)
 563         failed = !SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_TIME_CRITICAL);
 564 #elif defined(HAVE_PTHREAD_SETSCHEDPARAM) && !defined(__OpenBSD__)
 565     if(RTPrioLevel > 0)
 566     {
 567         struct sched_param param;
 568         /* Use the minimum real-time priority possible for now (on Linux this
 569          * should be 1 for SCHED_RR) */
 570         param.sched_priority = sched_get_priority_min(SCHED_RR);
 571         failed = !!pthread_setschedparam(pthread_self(), SCHED_RR, &param);
 572     }
 573 #else
 574     /* Real-time priority not available */
 575     failed = (RTPrioLevel>0);
 576 #endif
 577     if(failed)
 578         ERR("Failed to set priority level for thread\n");
 579 }
 580
 581
 582 ALboolean vector_reserve(void *ptr, size_t base_size, size_t obj_count, size_t obj_size, ALboolean exact)
 583 {
 584     vector_ *vecptr = ptr;
 585     if((size_t)(*vecptr ? (*vecptr)->Capacity : 0) < obj_count)
 586     {
 587         ALsizei old_size = (*vecptr ? (*vecptr)->Size : 0);
 588         void *temp;
 589
 590         /* Limit vector sizes to the greatest power-of-two value that an
 591          * ALsizei can hold. */
 592         if(obj_count > (INT_MAX>>1)+1)
 593             return AL_FALSE;
 594
 595         /* Use the next power-of-2 size if we don't need to allocate the exact
 596          * amount. This is preferred when regularly increasing the vector since
 597          * it means fewer reallocations. Though it means it also wastes some
 598          * memory. */
 599         if(exact == AL_FALSE)
 600             obj_count = NextPowerOf2((ALuint)obj_count);
 601
 602         /* Need to be explicit with the caller type's base size, because it
 603          * could have extra padding before the start of the array (that is,
 604          * sizeof(*vector_) may not equal base_size). */
 605         temp = realloc(*vecptr, base_size + obj_size*obj_count);
 606         if(temp == NULL) return AL_FALSE;
 607
 608         *vecptr = temp;
 609         (*vecptr)->Capacity = (ALsizei)obj_count;
 610         (*vecptr)->Size = old_size;
 611     }
 612     return AL_TRUE;
 613 }
 614
 615 ALboolean vector_resize(void *ptr, size_t base_size, size_t obj_count, size_t obj_size)
 616 {
 617     vector_ *vecptr = ptr;
 618     if(*vecptr || obj_count > 0)
 619     {
 620         if(!vector_reserve(vecptr, base_size, obj_count, obj_size, AL_TRUE))
 621             return AL_FALSE;
 622         (*vecptr)->Size = (ALsizei)obj_count;
 623     }
 624     return AL_TRUE;
 625 }
 626
 627 ALboolean vector_insert(void *ptr, size_t base_size, size_t obj_size, void *ins_pos, const void *datstart, const void *datend)
 628 {
 629     vector_ *vecptr = ptr;
 630     if(datstart != datend)
 631     {
 632         ptrdiff_t ins_elem = ((char*)ins_pos - ((char*)(*vecptr) + base_size)) / obj_size;
 633         ptrdiff_t numins = ((const char*)datend - (const char*)datstart) / obj_size;
 634         if(!vector_reserve(vecptr, base_size, VECTOR_SIZE(*vecptr)+numins, obj_size, AL_TRUE))
 635             return AL_FALSE;
 636         /* NOTE: ins_pos may have been invalidated if *vecptr moved. Use ins_elem instead. */
 637         if(ins_elem < (*vecptr)->Size)
 638         {
 639             memmove((char*)(*vecptr) + base_size + ((ins_elem+numins)*obj_size),
 640                     (char*)(*vecptr) + base_size + ((ins_elem       )*obj_size),
 641                     ((*vecptr)->Size-ins_elem)*obj_size);
 642         }
 643         memcpy((char*)(*vecptr) + base_size + (ins_elem*obj_size),
 644                datstart, numins*obj_size);
 645         (*vecptr)->Size += (ALsizei)numins;
 646     }
 647     return AL_TRUE;
 648 }
 649
 650
 651 extern inline ALsizei al_string_length(const_al_string str);
 652 extern inline ALboolean al_string_empty(const_al_string str);
 653 extern inline const al_string_char_type *al_string_get_cstr(const_al_string str);
 654
 655 void al_string_clear(al_string *str)
 656 {
 657     /* Reserve one more character than the total size of the string. This is to
 658      * ensure we have space to add a null terminator in the string data so it
 659      * can be used as a C-style string. */
 660     VECTOR_RESERVE(*str, 1);
 661     VECTOR_RESIZE(*str, 0);
 662     *VECTOR_ITER_END(*str) = 0;
 663 }
 664
 665 static inline int al_string_compare(const al_string_char_type *str1, ALsizei str1len,
 666                                     const al_string_char_type *str2, ALsizei str2len)
 667 {
 668     ALsizei complen = mini(str1len, str2len);
 669     int ret = memcmp(str1, str2, complen);
 670     if(ret == 0)
 671     {
 672         if(str1len > str2len) return  1;
 673         if(str1len < str2len) return -1;
 674     }
 675     return ret;
 676 }
 677 int al_string_cmp(const_al_string str1, const_al_string str2)
 678 {
 679     return al_string_compare(&VECTOR_FRONT(str1), al_string_length(str1),
 680                              &VECTOR_FRONT(str2), al_string_length(str2));
 681 }
 682 int al_string_cmp_cstr(const_al_string str1, const al_string_char_type *str2)
 683 {
 684     return al_string_compare(&VECTOR_FRONT(str1), al_string_length(str1),
 685                              str2, (ALsizei)strlen(str2));
 686 }
 687
 688 void al_string_copy(al_string *str, const_al_string from)
 689 {
 690     ALsizei len = VECTOR_SIZE(from);
 691     VECTOR_RESERVE(*str, len+1);
 692     VECTOR_RESIZE(*str, 0);
 693     VECTOR_INSERT(*str, VECTOR_ITER_END(*str), VECTOR_ITER_BEGIN(from), VECTOR_ITER_BEGIN(from)+len);
 694     *VECTOR_ITER_END(*str) = 0;
 695 }
 696
 697 void al_string_copy_cstr(al_string *str, const al_string_char_type *from)
 698 {
 699     size_t len = strlen(from);
 700     VECTOR_RESERVE(*str, len+1);
 701     VECTOR_RESIZE(*str, 0);
 702     VECTOR_INSERT(*str, VECTOR_ITER_END(*str), from, from+len);
 703     *VECTOR_ITER_END(*str) = 0;
 704 }
 705
 706 void al_string_append_char(al_string *str, const al_string_char_type c)
 707 {
 708     VECTOR_RESERVE(*str, al_string_length(*str)+2);
 709     VECTOR_PUSH_BACK(*str, c);
 710     *VECTOR_ITER_END(*str) = 0;
 711 }
 712
 713 void al_string_append_cstr(al_string *str, const al_string_char_type *from)
 714 {
 715     size_t len = strlen(from);
 716     if(len != 0)
 717     {
 718         VECTOR_RESERVE(*str, al_string_length(*str)+len+1);
 719         VECTOR_INSERT(*str, VECTOR_ITER_END(*str), from, from+len);
 720         *VECTOR_ITER_END(*str) = 0;
 721     }
 722 }
 723
 724 void al_string_append_range(al_string *str, const al_string_char_type *from, const al_string_char_type *to)
 725 {
 726     if(to != from)
 727     {
 728         VECTOR_RESERVE(*str, al_string_length(*str)+(to-from)+1);
 729         VECTOR_INSERT(*str, VECTOR_ITER_END(*str), from, to);
 730         *VECTOR_ITER_END(*str) = 0;
 731     }
 732 }
 733
 734 #ifdef _WIN32
 735 void al_string_copy_wcstr(al_string *str, const wchar_t *from)
 736 {
 737     int len;
 738     if((len=WideCharToMultiByte(CP_UTF8, 0, from, -1, NULL, 0, NULL, NULL)) > 0)
 739     {
 740         VECTOR_RESERVE(*str, len);
 741         VECTOR_RESIZE(*str, len-1);
 742         WideCharToMultiByte(CP_UTF8, 0, from, -1, &VECTOR_FRONT(*str), len, NULL, NULL);
 743         *VECTOR_ITER_END(*str) = 0;
 744     }
 745 }
 746 #endif