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SqMod/vendor/Squirrel/stdlib/sqstdio.cpp
Sandu Liviu Catalin 4a6bfc086c Major plugin refactor and cleanup. 
Switched to POCO library for unified platform/library interface.
Deprecated the external module API. It was creating more problems than solving.
Removed most built-in libraries in favor of system libraries for easier maintenance.
Cleaned and secured code with help from static analyzers.
2021-01-30 08:51:39 +02:00

490 lines
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/* see copyright notice in squirrel.h */
#include <new>
#include <stdio.h>
#include <squirrel.h>
#include <sqstdio.h>
#include "sqstdstream.h"
#define SQSTD_FILE_TYPE_TAG ((SQUnsignedInteger)(SQSTD_STREAM_TYPE_TAG | 0x00000001))
//basic API
SQFILE sqstd_fopen(const SQChar *filename ,const SQChar *mode)
{
#ifndef SQUNICODE
return (SQFILE)fopen(filename,mode);
#else
return (SQFILE)_wfopen(filename,mode);
#endif
}
SQInteger sqstd_fread(void* buffer, SQInteger size, SQInteger count, SQFILE file)
{
SQInteger ret = (SQInteger)fread(buffer,size,count,(FILE *)file);
return ret;
}
SQInteger sqstd_fwrite(const SQUserPointer buffer, SQInteger size, SQInteger count, SQFILE file)
{
return (SQInteger)fwrite(buffer,size,count,(FILE *)file);
}
SQInteger sqstd_fseek(SQFILE file, SQInteger offset, SQInteger origin)
{
SQInteger realorigin;
switch(origin) {
case SQ_SEEK_CUR: realorigin = SEEK_CUR; break;
case SQ_SEEK_END: realorigin = SEEK_END; break;
case SQ_SEEK_SET: realorigin = SEEK_SET; break;
default: return -1; //failed
}
return fseek((FILE *)file,(long)offset,(int)realorigin);
}
SQInteger sqstd_ftell(SQFILE file)
{
return ftell((FILE *)file);
}
SQInteger sqstd_fflush(SQFILE file)
{
return fflush((FILE *)file);
}
SQInteger sqstd_fclose(SQFILE file)
{
return fclose((FILE *)file);
}
SQInteger sqstd_feof(SQFILE file)
{
return feof((FILE *)file);
}
//File
struct SQFile : public SQStream {
SQFile() { _handle = NULL; _owns = false;}
SQFile(SQFILE file, bool owns) { _handle = file; _owns = owns;}
virtual ~SQFile() { Close(); }
bool Open(const SQChar *filename ,const SQChar *mode) {
Close();
if( (_handle = sqstd_fopen(filename,mode)) ) {
_owns = true;
return true;
}
return false;
}
void Close() {
if(_handle && _owns) {
sqstd_fclose(_handle);
_handle = NULL;
_owns = false;
}
}
SQInteger Read(void *buffer,SQInteger size) {
return sqstd_fread(buffer,1,size,_handle);
}
SQInteger Write(void *buffer,SQInteger size) {
return sqstd_fwrite(buffer,1,size,_handle);
}
SQInteger Flush() {
return sqstd_fflush(_handle);
}
SQInteger Tell() {
return sqstd_ftell(_handle);
}
SQInteger Len() {
SQInteger prevpos=Tell();
Seek(0,SQ_SEEK_END);
SQInteger size=Tell();
Seek(prevpos,SQ_SEEK_SET);
return size;
}
SQInteger Seek(SQInteger offset, SQInteger origin) {
return sqstd_fseek(_handle,offset,origin);
}
bool IsValid() { return _handle?true:false; }
bool EOS() { return Tell()==Len()?true:false;}
SQFILE GetHandle() {return _handle;}
private:
SQFILE _handle;
bool _owns;
};
static SQInteger _file__typeof(HSQUIRRELVM v)
{
sq_pushstring(v,_SC("file"),-1);
return 1;
}
static SQInteger _file_releasehook(SQUserPointer p, SQInteger SQ_UNUSED_ARG(size))
{
SQFile *self = (SQFile*)p;
self->~SQFile();
sq_free(self,sizeof(SQFile));
return 1;
}
static SQInteger _file_constructor(HSQUIRRELVM v)
{
const SQChar *filename,*mode;
bool owns = true;
SQFile *f;
SQFILE newf;
if(sq_gettype(v,2) == OT_STRING && sq_gettype(v,3) == OT_STRING) {
sq_getstring(v, 2, &filename);
sq_getstring(v, 3, &mode);
newf = sqstd_fopen(filename, mode);
if(!newf) return sq_throwerror(v, _SC("cannot open file"));
} else if(sq_gettype(v,2) == OT_USERPOINTER) {
owns = !(sq_gettype(v,3) == OT_NULL);
sq_getuserpointer(v,2,&newf);
} else {
return sq_throwerror(v,_SC("wrong parameter"));
}
f = new (sq_malloc(sizeof(SQFile)))SQFile(newf,owns);
if(SQ_FAILED(sq_setinstanceup(v,1,f))) {
f->~SQFile();
sq_free(f,sizeof(SQFile));
return sq_throwerror(v, _SC("cannot create blob with negative size"));
}
sq_setreleasehook(v,1,_file_releasehook);
return 0;
}
static SQInteger _file_close(HSQUIRRELVM v)
{
SQFile *self = NULL;
if(SQ_SUCCEEDED(sq_getinstanceup(v,1,(SQUserPointer*)&self,(SQUserPointer)SQSTD_FILE_TYPE_TAG))
&& self != NULL)
{
self->Close();
}
return 0;
}
//bindings
#define _DECL_FILE_FUNC(name,nparams,typecheck) {_SC(#name),_file_##name,nparams,typecheck}
static const SQRegFunction _file_methods[] = {
_DECL_FILE_FUNC(constructor,3,_SC("x")),
_DECL_FILE_FUNC(_typeof,1,_SC("x")),
_DECL_FILE_FUNC(close,1,_SC("x")),
{NULL,(SQFUNCTION)0,0,NULL}
};
SQRESULT sqstd_createfile(HSQUIRRELVM v, SQFILE file,SQBool own)
{
SQInteger top = sq_gettop(v);
sq_pushregistrytable(v);
sq_pushstring(v,_SC("std_file"),-1);
if(SQ_SUCCEEDED(sq_get(v,-2))) {
sq_remove(v,-2); //removes the registry
sq_pushroottable(v); // push the this
sq_pushuserpointer(v,file); //file
if(own){
sq_pushinteger(v,1); //true
}
else{
sq_pushnull(v); //false
}
if(SQ_SUCCEEDED( sq_call(v,3,SQTrue,SQFalse) )) {
sq_remove(v,-2);
return SQ_OK;
}
}
sq_settop(v,top);
return SQ_ERROR;
}
SQRESULT sqstd_getfile(HSQUIRRELVM v, SQInteger idx, SQFILE *file)
{
SQFile *fileobj = NULL;
if(SQ_SUCCEEDED(sq_getinstanceup(v,idx,(SQUserPointer*)&fileobj,(SQUserPointer)SQSTD_FILE_TYPE_TAG))) {
*file = fileobj->GetHandle();
return SQ_OK;
}
return sq_throwerror(v,_SC("not a file"));
}
#define IO_BUFFER_SIZE 2048
struct IOBuffer {
unsigned char buffer[IO_BUFFER_SIZE];
SQInteger size;
SQInteger ptr;
SQFILE file;
};
SQInteger _read_byte(IOBuffer *iobuffer)
{
if(iobuffer->ptr < iobuffer->size) {
SQInteger ret = iobuffer->buffer[iobuffer->ptr];
iobuffer->ptr++;
return ret;
}
else {
if( (iobuffer->size = sqstd_fread(iobuffer->buffer,1,IO_BUFFER_SIZE,iobuffer->file )) > 0 )
{
SQInteger ret = iobuffer->buffer[0];
iobuffer->ptr = 1;
return ret;
}
}
return 0;
}
SQInteger _read_two_bytes(IOBuffer *iobuffer)
{
if(iobuffer->ptr < iobuffer->size) {
if(iobuffer->size < 2) return 0;
SQInteger ret = *((const wchar_t*)&iobuffer->buffer[iobuffer->ptr]);
iobuffer->ptr += 2;
return ret;
}
else {
if( (iobuffer->size = sqstd_fread(iobuffer->buffer,1,IO_BUFFER_SIZE,iobuffer->file )) > 0 )
{
if(iobuffer->size < 2) return 0;
SQInteger ret = *((const wchar_t*)&iobuffer->buffer[0]);
iobuffer->ptr = 2;
return ret;
}
}
return 0;
}
static SQInteger _io_file_lexfeed_PLAIN(SQUserPointer iobuf)
{
IOBuffer *iobuffer = (IOBuffer *)iobuf;
return _read_byte(iobuffer);
}
#ifdef SQUNICODE
static SQInteger _io_file_lexfeed_UTF8(SQUserPointer iobuf)
{
IOBuffer *iobuffer = (IOBuffer *)iobuf;
#define READ(iobuf) \
if((inchar = (unsigned char)_read_byte(iobuf)) == 0) \
return 0;
static const SQInteger utf8_lengths[16] =
{
1,1,1,1,1,1,1,1, /* 0000 to 0111 : 1 byte (plain ASCII) */
0,0,0,0, /* 1000 to 1011 : not valid */
2,2, /* 1100, 1101 : 2 bytes */
3, /* 1110 : 3 bytes */
4 /* 1111 :4 bytes */
};
static const unsigned char byte_masks[5] = {0,0,0x1f,0x0f,0x07};
unsigned char inchar;
SQInteger c = 0;
READ(iobuffer);
c = inchar;
//
if(c >= 0x80) {
SQInteger tmp;
SQInteger codelen = utf8_lengths[c>>4];
if(codelen == 0)
return 0;
//"invalid UTF-8 stream";
tmp = c&byte_masks[codelen];
for(SQInteger n = 0; n < codelen-1; n++) {
tmp<<=6;
READ(iobuffer);
tmp |= inchar & 0x3F;
}
c = tmp;
}
return c;
}
#endif
static SQInteger _io_file_lexfeed_UCS2_LE(SQUserPointer iobuf)
{
SQInteger ret;
IOBuffer *iobuffer = (IOBuffer *)iobuf;
if( (ret = _read_two_bytes(iobuffer)) > 0 )
return ret;
return 0;
}
static SQInteger _io_file_lexfeed_UCS2_BE(SQUserPointer iobuf)
{
SQInteger c;
IOBuffer *iobuffer = (IOBuffer *)iobuf;
if( (c = _read_two_bytes(iobuffer)) > 0 ) {
c = ((c>>8)&0x00FF)| ((c<<8)&0xFF00);
return c;
}
return 0;
}
SQInteger file_read(SQUserPointer file,SQUserPointer buf,SQInteger size)
{
SQInteger ret;
if( ( ret = sqstd_fread(buf,1,size,(SQFILE)file ))!=0 )return ret;
return -1;
}
SQInteger file_write(SQUserPointer file,SQUserPointer p,SQInteger size)
{
return sqstd_fwrite(p,1,size,(SQFILE)file);
}
SQRESULT sqstd_loadfile(HSQUIRRELVM v,const SQChar *filename,SQBool printerror)
{
SQFILE file = sqstd_fopen(filename,_SC("rb"));
SQInteger ret;
unsigned short us;
unsigned char uc;
SQLEXREADFUNC func = _io_file_lexfeed_PLAIN;
if(file){
ret = sqstd_fread(&us,1,2,file);
if(ret != 2) {
//probably an empty file
us = 0;
}
if(us == SQ_BYTECODE_STREAM_TAG) { //BYTECODE
sqstd_fseek(file,0,SQ_SEEK_SET);
if(SQ_SUCCEEDED(sq_readclosure(v,file_read,file))) {
sqstd_fclose(file);
return SQ_OK;
}
}
else { //SCRIPT
switch(us)
{
//gotta swap the next 2 lines on BIG endian machines
case 0xFFFE: func = _io_file_lexfeed_UCS2_BE; break;//UTF-16 little endian;
case 0xFEFF: func = _io_file_lexfeed_UCS2_LE; break;//UTF-16 big endian;
case 0xBBEF:
if(sqstd_fread(&uc,1,sizeof(uc),file) == 0) {
sqstd_fclose(file);
return sq_throwerror(v,_SC("io error"));
}
if(uc != 0xBF) {
sqstd_fclose(file);
return sq_throwerror(v,_SC("Unrecognized encoding"));
}
#ifdef SQUNICODE
func = _io_file_lexfeed_UTF8;
#else
func = _io_file_lexfeed_PLAIN;
#endif
break;//UTF-8 ;
default: sqstd_fseek(file,0,SQ_SEEK_SET); break; // ascii
}
IOBuffer buffer;
buffer.ptr = 0;
buffer.size = 0;
buffer.file = file;
if(SQ_SUCCEEDED(sq_compile(v,func,&buffer,filename,printerror))){
sqstd_fclose(file);
return SQ_OK;
}
}
sqstd_fclose(file);
return SQ_ERROR;
}
return sq_throwerror(v,_SC("cannot open the file"));
}
SQRESULT sqstd_dofile(HSQUIRRELVM v,const SQChar *filename,SQBool retval,SQBool printerror)
{
//at least one entry must exist in order for us to push it as the environment
if(sq_gettop(v) == 0)
return sq_throwerror(v,_SC("environment table expected"));
if(SQ_SUCCEEDED(sqstd_loadfile(v,filename,printerror))) {
sq_push(v,-2);
if(SQ_SUCCEEDED(sq_call(v,1,retval,SQTrue))) {
sq_remove(v,retval?-2:-1); //removes the closure
return 1;
}
sq_pop(v,1); //removes the closure
}
return SQ_ERROR;
}
SQRESULT sqstd_writeclosuretofile(HSQUIRRELVM v,const SQChar *filename)
{
SQFILE file = sqstd_fopen(filename,_SC("wb+"));
if(!file) return sq_throwerror(v,_SC("cannot open the file"));
if(SQ_SUCCEEDED(sq_writeclosure(v,file_write,file))) {
sqstd_fclose(file);
return SQ_OK;
}
sqstd_fclose(file);
return SQ_ERROR; //forward the error
}
SQInteger _g_io_loadfile(HSQUIRRELVM v)
{
const SQChar *filename;
SQBool printerror = SQFalse;
sq_getstring(v,2,&filename);
if(sq_gettop(v) >= 3) {
sq_getbool(v,3,&printerror);
}
if(SQ_SUCCEEDED(sqstd_loadfile(v,filename,printerror)))
return 1;
return SQ_ERROR; //propagates the error
}
SQInteger _g_io_writeclosuretofile(HSQUIRRELVM v)
{
const SQChar *filename;
sq_getstring(v,2,&filename);
if(SQ_SUCCEEDED(sqstd_writeclosuretofile(v,filename)))
return 1;
return SQ_ERROR; //propagates the error
}
SQInteger _g_io_dofile(HSQUIRRELVM v)
{
const SQChar *filename;
SQBool printerror = SQFalse;
sq_getstring(v,2,&filename);
if(sq_gettop(v) >= 3) {
sq_getbool(v,3,&printerror);
}
sq_push(v,1); //repush the this
if(SQ_SUCCEEDED(sqstd_dofile(v,filename,SQTrue,printerror)))
return 1;
return SQ_ERROR; //propagates the error
}
#define _DECL_GLOBALIO_FUNC(name,nparams,typecheck) {_SC(#name),_g_io_##name,nparams,typecheck}
static const SQRegFunction iolib_funcs[]={
_DECL_GLOBALIO_FUNC(loadfile,-2,_SC(".sb")),
_DECL_GLOBALIO_FUNC(dofile,-2,_SC(".sb")),
_DECL_GLOBALIO_FUNC(writeclosuretofile,3,_SC(".sc")),
{NULL,(SQFUNCTION)0,0,NULL}
};
SQRESULT sqstd_register_iolib(HSQUIRRELVM v)
{
SQInteger top = sq_gettop(v);
//create delegate
declare_stream(v,_SC("file"),(SQUserPointer)SQSTD_FILE_TYPE_TAG,_SC("std_file"),_file_methods,iolib_funcs);
sq_pushstring(v,_SC("stdout"),-1);
sqstd_createfile(v,stdout,SQFalse);
sq_newslot(v,-3,SQFalse);
sq_pushstring(v,_SC("stdin"),-1);
sqstd_createfile(v,stdin,SQFalse);
sq_newslot(v,-3,SQFalse);
sq_pushstring(v,_SC("stderr"),-1);
sqstd_createfile(v,stderr,SQFalse);
sq_newslot(v,-3,SQFalse);
sq_settop(v,top);
return SQ_OK;
}
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