#include <malloc.h>

 #include <string.h>

 #include "sp_file_headers.h"

 #include "sp_vm_types.h"

 #include "sp_vm_engine.h"

 #include "zlib/zlib.h"

 #include "sp_vm_basecontext.h"

 #if defined WIN32

  #define WIN32_LEAN_AND_MEAN

  #include <windows.h>

 #else if defined __GNUC__

  #include <sys/mman.h>

 #endif

 using namespace SourcePawn;

 void *SourcePawnEngine::ExecAlloc(size_t size)

 {

 #if defined WIN32

 	return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);

 #else if defined __GNUC__

 	void *base = memalign(sysconf(_SC_PAGESIZE), size);

 	if (mprotect(base, size, PROT_READ|PROT_WRITE|PROT_EXEC) != 0)

 	{

 		free(base);

 		return NULL;

 	}

 	return base;

 #endif

 }

 void SourcePawnEngine::ExecFree(void *address)

 {

 #if defined WIN32

 	VirtualFree(address, 0, MEM_RELEASE);

 #else if defined __GNUC__

 	free(address);

 #endif

 }

 void *SourcePawnEngine::BaseAlloc(size_t size)

 {

 	return malloc(size);

 }

 void SourcePawnEngine::BaseFree(void *memory)

 {

 	free(memory);

 }

 IPluginContext *SourcePawnEngine::CreateBaseContext(sp_context_t *ctx)

 {

 	return new BaseContext(ctx);

 }

 void SourcePawnEngine::FreeBaseContext(IPluginContext *ctx)

 {

 	sp_context_t *_ctx = ctx->GetContext();

 	IVirtualMachine *vm = ctx->GetVirtualMachine();

 	vm->FreeContext(_ctx);

 	delete ctx;

 }

 sp_plugin_t *_ReadPlugin(sp_file_hdr_t *hdr, uint8_t *base, sp_plugin_t *plugin, int *err)

 {

 	char *nameptr;

 	uint8_t sectnum = 0;

 	sp_file_section_t *secptr = (sp_file_section_t *)(base + sizeof(sp_file_hdr_t));

 	memset(plugin, 0, sizeof(sp_plugin_t));

 	plugin->base = base;

 	while (sectnum < hdr->sections)

 	{

 		nameptr = (char *)(base + hdr->stringtab + secptr->nameoffs);

 		if (!(plugin->pcode) && !strcmp(nameptr, ".code"))

 		{

 			sp_file_code_t *cod = (sp_file_code_t *)(base + secptr->dataoffs);

 			plugin->pcode = base + secptr->dataoffs + cod->code;

 			plugin->pcode_size = cod->codesize;

 			plugin->flags = cod->flags;

 		}

 		else if (!(plugin->data) && !strcmp(nameptr, ".data"))

 		{

 			sp_file_data_t *dat = (sp_file_data_t *)(base + secptr->dataoffs);

 			plugin->data = base + secptr->dataoffs + dat->data;

 			plugin->data_size = dat->datasize;

 			plugin->memory = dat->memsize;

 		}

 		else if (!(plugin->info.publics) && !strcmp(nameptr, ".publics"))

 		{

 			plugin->info.publics_num = secptr->size / sizeof(sp_file_publics_t);

 			plugin->info.publics = (sp_file_publics_t *)(base + secptr->dataoffs);

 		}

 		else if (!(plugin->info.pubvars) && !strcmp(nameptr, ".pubvars"))

 		{

 			plugin->info.pubvars_num = secptr->size / sizeof(sp_file_pubvars_t);

 			plugin->info.pubvars = (sp_file_pubvars_t *)(base + secptr->dataoffs);

 		}

 		else if (!(plugin->info.natives) && !strcmp(nameptr, ".natives"))

 		{

 			plugin->info.natives_num = secptr->size / sizeof(sp_file_natives_t);

 			plugin->info.natives = (sp_file_natives_t *)(base + secptr->dataoffs);

 		}

 		else if (!(plugin->info.stringbase) && !strcmp(nameptr, ".names"))

 		{

 			plugin->info.stringbase = (const char *)(base + secptr->dataoffs);

 		}

 		else if (!(plugin->debug.files) && !strcmp(nameptr, ".dbg.files"))

 		{

 			plugin->debug.files = (sp_fdbg_file_t *)(base + secptr->dataoffs);

 		}

 		else if (!(plugin->debug.lines) && !strcmp(nameptr, ".dbg.lines"))

 		{

 			plugin->debug.lines = (sp_fdbg_line_t *)(base + secptr->dataoffs);

 		}

 		else if (!(plugin->debug.symbols) && !strcmp(nameptr, ".dbg.symbols"))

 		{

 			plugin->debug.symbols = (sp_fdbg_symbol_t *)(base + secptr->dataoffs);

 		}

 		else if (!(plugin->debug.lines_num) && !strcmp(nameptr, ".dbg.info"))

 		{

 			sp_fdbg_info_t *inf = (sp_fdbg_info_t *)(base + secptr->dataoffs);

 			plugin->debug.files_num = inf->num_files;

 			plugin->debug.lines_num = inf->num_lines;

 			plugin->debug.syms_num = inf->num_syms;

 		}

 		else if (!(plugin->debug.stringbase) && !strcmp(nameptr, ".dbg.strings"))

 		{

 			plugin->debug.stringbase = (const char *)(base + secptr->dataoffs);

 		}

 		secptr++;

 		sectnum++;

 	}

 	if (!(plugin->pcode) || !(plugin->data) || !(plugin->info.stringbase))

 	{

 		goto return_error;

 	}

 	if ((plugin->flags & SP_FLAG_DEBUG) && (!(plugin->debug.files) || !(plugin->debug.lines) || !(plugin->debug.symbols)))

 	{

 		goto return_error;

 	}

 	if (err)

 	{

 		*err = SP_ERROR_NONE;

 	}

 	return plugin;

 return_error:

 	if (err)

 	{

 		*err = SP_ERROR_FILE_FORMAT;

 	}

 	return NULL;

 }

 sp_plugin_t *SourcePawnEngine::LoadFromFilePointer(FILE *fp, int *err)

 {

 	sp_file_hdr_t hdr;

 	sp_plugin_t *plugin;

 	uint8_t *base;

 	int z_result;

 	int error;

 	if (!fp)

 	{

 		error = SP_ERROR_NOT_FOUND;

 		goto return_error;

 	}

 	/* Rewind for safety */

 	rewind(fp);

 	fread(&hdr, sizeof(sp_file_hdr_t), 1, fp);

 	if (hdr.magic != SPFILE_MAGIC)

 	{

 		error = SP_ERROR_FILE_FORMAT;

 		goto return_error;

 	}

 	switch (hdr.compression)

 	{

 	case SPFILE_COMPRESSION_GZ:

 		{

 			uint32_t uncompsize = hdr.imagesize - hdr.dataoffs;

 			uint32_t compsize = hdr.disksize - hdr.dataoffs;

 			uint32_t sectsize = hdr.dataoffs - sizeof(sp_file_hdr_t);

 			uLongf destlen = uncompsize;

 			char *tempbuf = (char *)malloc(compsize);

 			void *uncompdata = malloc(uncompsize);

 			void *sectheader = malloc(sectsize);

 			fread(sectheader, sectsize, 1, fp);

 			fread(tempbuf, compsize, 1, fp);

 			z_result = uncompress((Bytef *)uncompdata, &destlen, (Bytef *)tempbuf, compsize);

 			free(tempbuf);

 			if (z_result != Z_OK)

 			{

 				free(sectheader);

 				free(uncompdata);

 				error = SP_ERROR_DECOMPRESSOR;

 				goto return_error;

 			}

 			base = (uint8_t *)malloc(hdr.imagesize);

 			memcpy(base, &hdr, sizeof(sp_file_hdr_t));

 			memcpy(base + sizeof(sp_file_hdr_t), sectheader, sectsize);

 			free(sectheader);

 			memcpy(base + hdr.dataoffs, uncompdata, uncompsize);

 			free(uncompdata);

 			break;

 		}

 	case SPFILE_COMPRESSION_NONE:

 		{

 			base = (uint8_t *)malloc(hdr.imagesize);

 			rewind(fp);

 			fread(base, hdr.imagesize, 1, fp);

 			break;

 		}

 	default:

 		{

 			error = SP_ERROR_DECOMPRESSOR;

 			goto return_error;

 		}

 	}

 	plugin = (sp_plugin_t *)malloc(sizeof(sp_plugin_t));

 	if (!_ReadPlugin(&hdr, base, plugin, err))

 	{

 		free(plugin);

 		free(base);

 		return NULL;

 	}

 	plugin->allocflags = 0;

 	return plugin;

 return_error:

 	if (err)

 	{

 		*err = error;

 	}

 	return NULL;

 }

 sp_plugin_t *SourcePawnEngine::LoadFromMemory(void *base, sp_plugin_t *plugin, int *err)

 {

 	sp_file_hdr_t hdr;

 	uint8_t noptr = 0;

 	memcpy(&hdr, base, sizeof(sp_file_hdr_t));

 	if (!plugin)

 	{

 		plugin = (sp_plugin_t *)malloc(sizeof(sp_plugin_t));

 		noptr = 1;

 	}

 	if (!_ReadPlugin(&hdr, (uint8_t *)base, plugin, err))

 	{

 		if (noptr)

 		{

 			free(plugin);

 		}

 		return NULL;

 	}

 	if (!noptr)

 	{

 		plugin->allocflags |= SP_FA_SELF_EXTERNAL;

 	}

 	plugin->allocflags |= SP_FA_BASE_EXTERNAL;

 	return plugin;

 }

 int SourcePawnEngine::FreeFromMemory(sp_plugin_t *plugin)

 {

 	if (!(plugin->allocflags & SP_FA_BASE_EXTERNAL))

 	{

 		free(plugin->base);

 		plugin->base = NULL;

 	}

 	if (!(plugin->allocflags & SP_FA_SELF_EXTERNAL))

 	{

 		free(plugin);

 	}

 	return SP_ERROR_NONE;

 }