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[FileAccess] Implement support for reading and writing extended file attributes/alternate data streams.

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This commit is contained in:
Pāvels Nadtočajevs
2025-01-16 13:42:24 +02:00
parent 235a32ad11
commit d454e1a1e0
7 changed files with 391 additions and 0 deletions
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114
drivers/unix/file_access_unix.cpp
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@@ -38,6 +38,9 @@
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#if !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__NetBSD__) && !defined(WEB_ENABLED)
#include <sys/xattr.h>
#endif
#include <unistd.h>
#include <cerrno>
@@ -506,6 +509,117 @@ Error FileAccessUnix::_set_read_only_attribute(const String &p_file, bool p_ro)
#endif
}
PackedByteArray FileAccessUnix::_get_extended_attribute(const String &p_file, const String &p_attribute_name) {
ERR_FAIL_COND_V(p_attribute_name.is_empty(), PackedByteArray());
String file = fix_path(p_file);
PackedByteArray data;
#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(WEB_ENABLED)
// Not supported.
#elif defined(__APPLE__)
CharString attr_name = p_attribute_name.utf8();
ssize_t attr_size = getxattr(file.utf8().get_data(), attr_name.get_data(), nullptr, 0, 0, 0);
if (attr_size <= 0) {
return PackedByteArray();
}
data.resize(attr_size);
attr_size = getxattr(file.utf8().get_data(), attr_name.get_data(), (void *)data.ptrw(), data.size(), 0, 0);
ERR_FAIL_COND_V_MSG(attr_size != data.size(), PackedByteArray(), "Failed to set extended attributes for: " + p_file);
#else
CharString attr_name = ("user." + p_attribute_name).utf8();
ssize_t attr_size = getxattr(file.utf8().get_data(), attr_name.get_data(), nullptr, 0);
if (attr_size <= 0) {
return PackedByteArray();
}
data.resize(attr_size);
attr_size = getxattr(file.utf8().get_data(), attr_name.get_data(), (void *)data.ptrw(), data.size());
ERR_FAIL_COND_V_MSG(attr_size != data.size(), PackedByteArray(), "Failed to set extended attributes for: " + p_file);
#endif
return data;
}
Error FileAccessUnix::_set_extended_attribute(const String &p_file, const String &p_attribute_name, const PackedByteArray &p_data) {
ERR_FAIL_COND_V(p_attribute_name.is_empty(), FAILED);
String file = fix_path(p_file);
#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(WEB_ENABLED)
// Not supported.
#elif defined(__APPLE__)
int err = setxattr(file.utf8().get_data(), p_attribute_name.utf8().get_data(), (const void *)p_data.ptr(), p_data.size(), 0, 0);
if (err != 0) {
return FAILED;
}
#else
int err = setxattr(file.utf8().get_data(), ("user." + p_attribute_name).utf8().get_data(), (const void *)p_data.ptr(), p_data.size(), 0);
if (err != 0) {
return FAILED;
}
#endif
return OK;
}
Error FileAccessUnix::_remove_extended_attribute(const String &p_file, const String &p_attribute_name) {
ERR_FAIL_COND_V(p_attribute_name.is_empty(), FAILED);
String file = fix_path(p_file);
#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(WEB_ENABLED)
// Not supported.
#elif defined(__APPLE__)
int err = removexattr(file.utf8().get_data(), p_attribute_name.utf8().get_data(), 0);
if (err != 0) {
return FAILED;
}
#else
int err = removexattr(file.utf8().get_data(), ("user." + p_attribute_name).utf8().get_data());
if (err != 0) {
return FAILED;
}
#endif
return OK;
}
PackedStringArray FileAccessUnix::_get_extended_attributes_list(const String &p_file) {
PackedStringArray ret;
String file = fix_path(p_file);
#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(WEB_ENABLED)
// Not supported.
#elif defined(__APPLE__)
size_t size = listxattr(file.utf8().get_data(), nullptr, 0, 0);
if (size > 0) {
PackedByteArray data;
data.resize(size);
listxattr(file.utf8().get_data(), (char *)data.ptrw(), data.size(), 0);
int64_t start = 0;
for (int64_t x = 0; x < data.size(); x++) {
if (x != start && data[x] == 0) {
ret.push_back(String::utf8((const char *)(data.ptr() + start), x - start));
start = x + 1;
}
}
}
#else
size_t size = listxattr(file.utf8().get_data(), nullptr, 0);
if (size > 0) {
PackedByteArray data;
data.resize(size);
listxattr(file.utf8().get_data(), (char *)data.ptrw(), data.size());
int64_t start = 0;
for (int64_t x = 0; x < data.size(); x++) {
if (x != start && data[x] == 0) {
String name = String::utf8((const char *)(data.ptr() + start), x - start);
if (name.begins_with("user.")) {
ret.push_back(name.trim_prefix("user."));
}
start = x + 1;
}
}
}
#endif
return ret;
}
void FileAccessUnix::close() {
_close();
}