Function PushSymbol

hyperdbg/script-engine/code/script-engine.c:3965–4075

* @brief Gets a symbol and push it into the symbol buffer * * @param SymbolBuffer * @param Symbol * @return PSYMBOL_BUFFER */

 * @return PSYMBOL_BUFFER
 */
PSYMBOL_BUFFER
PushSymbol(PSYMBOL_BUFFER SymbolBuffer, const PSYMBOL Symbol)
{
    //
    // Calculate address to write new token
    //
    uintptr_t Head      = (uintptr_t)SymbolBuffer->Head;
    uintptr_t Pointer   = (uintptr_t)SymbolBuffer->Pointer;
    PSYMBOL   WriteAddr = (PSYMBOL)(Head + Pointer * sizeof(SYMBOL));

    if (Symbol->Type == SYMBOL_STRING_TYPE || Symbol->Type == SYMBOL_WSTRING_TYPE)
    {
        //
        // Update Pointer
        //
        SymbolBuffer->Pointer += GetSymbolHeapSize(Symbol);

        //
        // Handle Overflow
        //
        if (SymbolBuffer->Pointer >= SymbolBuffer->Size - 1)
        {
            //
            // Calculate new size for the symbol B
            //
            unsigned int NewSize = SymbolBuffer->Size;
            do
            {
                NewSize *= 2;
            } while (NewSize <= SymbolBuffer->Pointer);

            //
            // Allocate a new buffer for string list with doubled length
            //
            PSYMBOL NewHead = (PSYMBOL)malloc(NewSize * sizeof(SYMBOL));

            if (NewHead == NULL)
            {
                printf("err, could not allocate buffer");
                return NULL;
            }

            //
            // Copy old buffer to new buffer
            //
            memcpy(NewHead, SymbolBuffer->Head, SymbolBuffer->Size * sizeof(SYMBOL));

            //
            // Free old buffer
            //
            free(SymbolBuffer->Head);

            //
            // Update Head and size of SymbolBuffer
            //
            SymbolBuffer->Size = NewSize;
            SymbolBuffer->Head = NewHead;
        }