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godot/core/os/file_access.cpp

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/*************************************************************************/
/* file_access.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* http://www.godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "file_access.h"
#include "globals.h"
#include "os/os.h"
#include "core/io/marshalls.h"
#include "io/md5.h"
#include "io/sha256.h"
#include "core/io/file_access_pack.h"
FileAccess::CreateFunc FileAccess::create_func[ACCESS_MAX]={0,0};
FileAccess::FileCloseFailNotify FileAccess::close_fail_notify=NULL;
bool FileAccess::backup_save=false;
FileAccess *FileAccess::create(AccessType p_access){
ERR_FAIL_COND_V( !create_func, 0 );
ERR_FAIL_INDEX_V( p_access,ACCESS_MAX, 0 );
FileAccess *ret = create_func[p_access]();
ret->_set_access_type(p_access);
return ret;
}
bool FileAccess::exists(const String& p_name) {
if (PackedData::get_singleton()->has_path(p_name))
return true;
FileAccess *f=open(p_name,READ);
if (!f)
return false;
memdelete(f);
return true;
}
void FileAccess::_set_access_type(AccessType p_access) {
_access_type = p_access;
};
FileAccess *FileAccess::create_for_path(const String& p_path) {
FileAccess *ret=NULL;
if (p_path.begins_with("res://")) {
ret = create(ACCESS_RESOURCES);
} else if (p_path.begins_with("user://")) {
ret = create(ACCESS_USERDATA);
} else {
ret = create(ACCESS_FILESYSTEM);
}
return ret;
}
Error FileAccess::reopen(const String& p_path, int p_mode_flags) {
return _open(p_path, p_mode_flags);
};
FileAccess *FileAccess::open(const String& p_path, int p_mode_flags, Error *r_error) {
//try packed data first
FileAccess *ret=NULL;
if (!(p_mode_flags&WRITE) && PackedData::get_singleton() && !PackedData::get_singleton()->is_disabled()) {
ret = PackedData::get_singleton()->try_open_path(p_path);
if (ret) {
if (r_error)
*r_error=OK;
return ret;
}
}
ret=create_for_path(p_path);
Error err = ret->_open(p_path,p_mode_flags);
if (r_error)
*r_error=err;
if (err!=OK) {
memdelete(ret);
ret=NULL;
}
return ret;
}
FileAccess::CreateFunc FileAccess::get_create_func(AccessType p_access) {
return create_func[p_access];
};
String FileAccess::fix_path(const String& p_path) const {
//helper used by file accesses that use a single filesystem
String r_path = p_path.replace("\\", "/");
switch(_access_type) {
case ACCESS_RESOURCES: {
if (Globals::get_singleton()) {
if (r_path.begins_with("res://")) {
String resource_path = Globals::get_singleton()->get_resource_path();
if (resource_path != "") {
return r_path.replace("res:/",resource_path);
};
return r_path.replace("res://", "");
}
}
} break;
case ACCESS_USERDATA: {
if (r_path.begins_with("user://")) {
String data_dir=OS::get_singleton()->get_data_dir();
if (data_dir != "") {
return r_path.replace("user:/",data_dir);
};
return r_path.replace("user://", "");
}
} break;
case ACCESS_FILESYSTEM: {
return r_path;
} break;
}
return r_path;
}
/* these are all implemented for ease of porting, then can later be optimized */
uint16_t FileAccess::get_16()const {
uint16_t res;
uint8_t a,b;
a=get_8();
b=get_8();
if (endian_swap) {
SWAP( a,b );
}
res=b;
res<<=8;
res|=a;
return res;
}
uint32_t FileAccess::get_32() const{
uint32_t res;
uint16_t a,b;
a=get_16();
b=get_16();
if (endian_swap) {
SWAP( a,b );
}
res=b;
res<<=16;
res|=a;
return res;
}
uint64_t FileAccess::get_64()const {
uint64_t res;
uint32_t a,b;
a=get_32();
b=get_32();
if (endian_swap) {
SWAP( a,b );
}
res=b;
res<<=32;
res|=a;
return res;
}
float FileAccess::get_float() const {
MarshallFloat m;
m.i = get_32();
return m.f;
};
real_t FileAccess::get_real() const {
if (real_is_double)
return get_double();
else
return get_float();
}
double FileAccess::get_double() const {
MarshallDouble m;
m.l = get_64();
return m.d;
};
String FileAccess::get_line() const {
CharString line;
CharType c=get_8();
while(!eof_reached()) {
if (c=='\n' || c=='\0') {
line.push_back(0);
return String::utf8(line.get_data());
} else if (c!='\r')
line.push_back(c);
c=get_8();
}
line.push_back(0);
return String::utf8(line.get_data());
}
Vector<String> FileAccess::get_csv_line(String delim) const {
ERR_FAIL_COND_V(delim.length()!=1,Vector<String>());
String l;
int qc=0;
do {
l+=get_line()+"\n";
qc=0;
for(int i=0;i<l.length();i++) {
if (l[i]=='"')
qc++;
}
} while (qc%2);
l=l.substr(0, l.length()-1);
Vector<String> strings;
bool in_quote=false;
String current;
for(int i=0;i<l.length();i++) {
CharType c = l[i];
CharType s[2]={0,0};
if (!in_quote && c==delim[0]) {
strings.push_back(current);
current=String();
} else if (c=='"') {
if (l[i+1]=='"') {
s[0]='"';
current+=s;
i++;
} else {
in_quote=!in_quote;
}
} else {
s[0]=c;
current+=s;
}
}
strings.push_back(current);
return strings;
}
int FileAccess::get_buffer(uint8_t *p_dst,int p_length) const{
int i=0;
for (i=0; i<p_length && !eof_reached(); i++)
p_dst[i]=get_8();
return i;
}
void FileAccess::store_16(uint16_t p_dest) {
uint8_t a,b;
a=p_dest&0xFF;
b=p_dest>>8;
if (endian_swap) {
SWAP( a,b );
}
store_8(a);
store_8(b);
}
void FileAccess::store_32(uint32_t p_dest) {
uint16_t a,b;
a=p_dest&0xFFFF;
b=p_dest>>16;
if (endian_swap) {
SWAP( a,b );
}
store_16(a);
store_16(b);
}
void FileAccess::store_64(uint64_t p_dest) {
uint32_t a,b;
a=p_dest&0xFFFFFFFF;
b=p_dest>>32;
if (endian_swap) {
SWAP( a,b );
}
store_32(a);
store_32(b);
}
void FileAccess::store_real(real_t p_real) {
if (sizeof(real_t)==4)
store_float(p_real);
else
store_double(p_real);
}
void FileAccess::store_float(float p_dest) {
MarshallFloat m;
m.f = p_dest;
store_32(m.i);
};
void FileAccess::store_double(double p_dest) {
MarshallDouble m;
m.d = p_dest;
store_64(m.l);
};
uint64_t FileAccess::get_modified_time(const String& p_file) {
FileAccess *fa = create_for_path(p_file);
ERR_FAIL_COND_V(!fa,0);
uint64_t mt = fa->_get_modified_time(p_file);
memdelete(fa);
return mt;
}
void FileAccess::store_string(const String& p_string) {
if (p_string.length()==0)
return;
CharString cs=p_string.utf8();
store_buffer((uint8_t*)&cs[0],cs.length());
}
void FileAccess::store_pascal_string(const String& p_string) {
CharString cs = p_string.utf8();
store_32(cs.length());
store_buffer((uint8_t*)&cs[0], cs.length());
};
String FileAccess::get_pascal_string() {
uint32_t sl = get_32();
CharString cs;
cs.resize(sl+1);
get_buffer((uint8_t*)cs.ptr(),sl);
cs[sl]=0;
String ret;
ret.parse_utf8(cs.ptr());
return ret;
};
void FileAccess::store_line(const String& p_line) {
store_string(p_line);
store_8('\n');
}
void FileAccess::store_buffer(const uint8_t *p_src,int p_length) {
for (int i=0;i<p_length;i++)
store_8(p_src[i]);
}
Vector<uint8_t> FileAccess::get_file_as_array(const String& p_file) {
FileAccess *f=FileAccess::open(p_file,READ);
ERR_FAIL_COND_V(!f,Vector<uint8_t>());
Vector<uint8_t> data;
data.resize(f->get_len());
f->get_buffer(data.ptr(),data.size());
memdelete(f);
return data;
}
String FileAccess::get_md5(const String& p_file) {
FileAccess *f=FileAccess::open(p_file,READ);
if (!f)
return String();
MD5_CTX md5;
MD5Init(&md5);
unsigned char step[32768];
while(true) {
int br = f->get_buffer(step,32768);
if (br>0) {
MD5Update(&md5,step,br);
}
if (br < 4096)
break;
}
MD5Final(&md5);
String ret = String::md5(md5.digest);
memdelete(f);
return ret;
}
String FileAccess::get_sha256(const String& p_file) {
FileAccess *f=FileAccess::open(p_file,READ);
if (!f)
return String();
sha256_context sha256;
sha256_init(&sha256);
unsigned char step[32768];
while(true) {
int br = f->get_buffer(step,32768);
if (br>0) {
sha256_hash(&sha256,step,br);
}
if (br < 4096)
break;
}
unsigned char hash[32];
sha256_done(&sha256, hash);
memdelete(f);
return String::hex_encode_buffer(hash, 32);
}
FileAccess::FileAccess() {
endian_swap=false;
real_is_double=false;
_access_type=ACCESS_FILESYSTEM;
};
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