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/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "GLLibraryLoader.h"

#include "nsDebug.h"

#ifdef WIN32
#include <windows.h>
#endif

namespace mozilla {
namespace gl {

bool GLLibraryLoader::OpenLibrary(const char* library) {
  PRLibSpec lspec;
  lspec.type = PR_LibSpec_Pathname;
  lspec.value.pathname = library;

  mLibrary = PR_LoadLibraryWithFlags(lspec, PR_LD_LAZY | PR_LD_LOCAL);
  if (!mLibrary) return false;

  return true;
}

bool GLLibraryLoader::LoadSymbols(const SymLoadStruct* firstStruct,
                                  bool tryplatform, const char* prefix,
                                  bool warnOnFailure) {
  return LoadSymbols(mLibrary, firstStruct, tryplatform ? mLookupFunc : nullptr,
                     prefix, warnOnFailure);
}

PRFuncPtr GLLibraryLoader::LookupSymbol(const char* sym) {
  return LookupSymbol(mLibrary, sym, mLookupFunc);
}

PRFuncPtr GLLibraryLoader::LookupSymbol(PRLibrary* lib, const char* sym,
                                        PlatformLookupFunction lookupFunction) {
  PRFuncPtr res = 0;

  // try finding it in the library directly, if we have one
  if (lib) {
    res = PR_FindFunctionSymbol(lib, sym);
  }

  // then try looking it up via the lookup symbol
  if (!res && lookupFunction) {
    res = lookupFunction(sym);
  }

  // finally just try finding it in the process
  if (!res) {
    PRLibrary* leakedLibRef;
    res = PR_FindFunctionSymbolAndLibrary(sym, &leakedLibRef);
  }

  return res;
}

bool GLLibraryLoader::LoadSymbols(PRLibrary* lib,
                                  const SymLoadStruct* firstStruct,
                                  PlatformLookupFunction lookupFunction,
                                  const char* prefix, bool warnOnFailure) {
  char sbuf[MAX_SYMBOL_LENGTH * 2];
  int failCount = 0;

  const SymLoadStruct* ss = firstStruct;
  while (ss->symPointer) {
    *ss->symPointer = 0;

    for (int i = 0; i < MAX_SYMBOL_NAMES; i++) {
      if (ss->symNames[i] == nullptr) break;

      const char* s = ss->symNames[i];
      if (prefix && *prefix != 0) {
        strcpy(sbuf, prefix);
        strcat(sbuf, ss->symNames[i]);
        s = sbuf;
      }

      PRFuncPtr p = LookupSymbol(lib, s, lookupFunction);
      if (p) {
        *ss->symPointer = p;
        break;
      }
    }

    if (*ss->symPointer == 0) {
      if (warnOnFailure) {
        printf_stderr("Can't find symbol '%s'.\n", ss->symNames[0]);
      }

      failCount++;
    }

    ss++;
  }

  return failCount == 0 ? true : false;
}

/*static*/ void GLLibraryLoader::ClearSymbols(
    const SymLoadStruct* const firstStruct) {
  for (auto cur = firstStruct; cur->symPointer; ++cur) {
    *cur->symPointer = nullptr;
  }
}

} /* namespace gl */
} /* namespace mozilla */