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KeystoneLib.cpp

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#include "KeystoneLib.h"

// Function used to assemble code with keystone. Code taken from keystone sample and adapted

unsigned char* KeystoneLib::Assemble(size_t *p_pSize, string p_sASM)

{

ks_engine *ks;

ks_err err = KS_ERR_ARCH;

size_t count;

unsigned char *encode;

size_t size;

unsigned char *output = NULL;

// Open keystone engine

if(Platform::GetPlatform() == PLATFORM_TYPE_WINDOWS_X64 || Platform::GetPlatform() == PLATFORM_TYPE_LINUX_X64) err = ks_open(KS_ARCH_X86, KS_MODE_64, &ks);

else err = ks_open(KS_ARCH_X86, KS_MODE_32, &ks);

if (err != KS_ERR_OK) {

cout << "ERROR: Failed on ks_open()" << endl;

return NULL;

}

// Assemble the code

ks_option(ks, KS_OPT_SYNTAX, KS_OPT_SYNTAX_NASM);

if (ks_asm(ks, p_sASM.c_str(), 0, &encode, &size, &count)) {

cout << "ERROR: Failed on ks_asm() with count = " << count << ", error code = " << ks_errno(ks) << endl;

return NULL;

}

// If everything was OK, set the size and output and return

output = new unsigned char[size];

if (!output)

{

cout << "ERROR: Cannot allocate memmory for output" << endl;

return NULL;

}

*p_pSize = size;

memcpy(output, encode, size);

// Assembly information

cout << "Assembled: " << size << " bytes, " << count << " statements" << endl;

// Cleanup allocated data

ks_free(encode);

ks_close(ks);

return output;

}