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godot/core/os/file_access.cpp
Rémi Verschelde d8223ffa75 Welcome in 2017, dear changelog reader! 
That year should bring the long-awaited OpenGL ES 3.0 compatible renderer
with state-of-the-art rendering techniques tuned to work as low as middle
end handheld devices - without compromising with the possibilities given
for higher end desktop games of course. Great times ahead for the Godot
community and the gamers that will play our games!

(cherry picked from commit c7bc44d5ad)
2017-01-12 19:15:30 +01:00

559 lines
9.9 KiB
C++
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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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