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/**************************************************************************
* *
* Regina - A Normal Surface Theory Calculator *
* Computational Engine *
* *
* Copyright (c) 1999-2025, Ben Burton *
* For further details contact Ben Burton (bab@debian.org). *
* *
* This program is free software; you can redistribute it and/or *
* modify it under the terms of the GNU General Public License as *
* published by the Free Software Foundation; either version 2 of the *
* License, or (at your option) any later version. *
* *
* As an exception, when this program is distributed through (i) the *
* App Store by Apple Inc.; (ii) the Mac App Store by Apple Inc.; or *
* (iii) Google Play by Google Inc., then that store may impose any *
* digital rights management, device limits and/or redistribution *
* restrictions that are required by its terms of service. *
* *
* This program is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program. If not, see <https://www.gnu.org/licenses/>. *
* *
**************************************************************************/
#include <cstdio>
#include <filesystem>
#include <sys/stat.h>
#include "packet/attachment.h"
#include "utilities/base64.h"
#include "utilities/xmlutils.h"
#define BASE64_LINE_LEN 76
namespace regina {
Attachment::Attachment(const char* pathname) :
data_(nullptr), size_(0), alloc_(OwnershipPolicy::OwnNew) {
// Use FILE* so we can call fstat().
// Open the file.
FILE* in = fopen(pathname, "rb");
if (! in)
return;
// Get the file size.
struct stat s;
if (fstat(fileno(in), &s)) {
fclose(in);
return;
}
size_t size = s.st_size;
if (size == 0) {
fclose(in);
return;
}
// Read the file contents.
char* data = new char[size];
if (fread(data, 1, size, in) != size) {
fclose(in);
delete[] data;
return;
}
// Is there more to the file that we weren't expecting?
char c;
if (fread(&c, 1, 1, in) > 0) {
fclose(in);
delete[] data;
return;
}
// All good!
fclose(in);
data_ = data;
size_ = size;
try {
// The choice bewteen string() vs generic_string() is irrelevant here.
filename_ = std::filesystem::path(pathname).filename().string();
} catch (const std::exception&) {
filename_.clear();
}
}
std::string Attachment::extension() const {
if (! data_)
return {};
try {
// The choice bewteen string() vs generic_string() is irrelevant here.
return std::filesystem::path(filename_).extension().string();
} catch (const std::exception&) {
return {};
}
}
void Attachment::reset() {
PacketChangeSpan span(*this);
if (data_) {
if (alloc_ == OwnershipPolicy::OwnMalloc)
::free(data_);
else
delete[] data_;
}
data_ = nullptr;
size_ = 0;
alloc_ = OwnershipPolicy::OwnNew;
filename_.clear();
}
void Attachment::reset(char* data, size_t size, OwnershipPolicy alloc,
std::string filename) {
PacketChangeSpan span(*this);
// Out with the old data.
if (data_) {
if (alloc_ == OwnershipPolicy::OwnMalloc)
::free(data_);
else
delete[] data_;
}
// In with the new.
if (data) {
data_ = data;
size_ = size;
if (alloc == OwnershipPolicy::DeepCopy) {
data_ = static_cast<char*>(::malloc(size_));
::memcpy(data_, static_cast<const char*>(data), size_);
alloc_ = OwnershipPolicy::OwnMalloc;
} else
alloc_ = alloc;
} else {
data_ = nullptr;
size_ = 0;
alloc_ = OwnershipPolicy::OwnNew;
}
filename_ = std::move(filename);
}
bool Attachment::save(const char* pathname) const {
if (! data_)
return false;
// Use FILE* for symmetry with the file load routine.
// Open the file.
FILE* out = fopen(pathname, "wb");
if (!out)
return false;
// Is there anything to write?
if (fwrite(data_, 1, size_, out) != size_) {
fclose(out);
return false;
}
// All done.
fclose(out);
return true;
}
void Attachment::writeXMLPacketData(std::ostream& out, FileFormat format,
bool anon, PacketRefs& refs) const {
char* base64 = nullptr;
size_t len64 = 0;
if (data_)
len64 = base64Encode(data_, size_, &base64);
if (! base64) {
// Either we have an empty attachment, or the base64 conversion failed.
writeXMLHeader(out, "attachment", format, anon, refs, true,
std::pair("encoding", "null"), std::pair("filename", ""));
if (format == FileFormat::XmlGen2)
out << " <pdf encoding=\"null\"></pdf>\n";
if (! anon)
writeXMLTreeData(out, format, refs);
writeXMLFooter(out, "attachment", format);
return;
}
writeXMLHeader(out, "attachment", format, anon, refs, true,
std::pair("encoding", "base64"),
std::pair("filename", regina::xml::xmlEncodeSpecialChars(filename_)));
if (format == FileFormat::XmlGen2)
out << " <pdf encoding=\"base64\">\n";
const char* pos = base64;
while (len64 > BASE64_LINE_LEN) {
out.write(pos, BASE64_LINE_LEN);
out << std::endl;
pos += BASE64_LINE_LEN;
len64 -= BASE64_LINE_LEN;
}
if (len64 > 0) {
out.write(pos, len64);
out << std::endl;
}
if (format == FileFormat::XmlGen2)
out << " </pdf>\n";
if (! anon)
writeXMLTreeData(out, format, refs);
writeXMLFooter(out, "attachment", format);
delete[] base64;
}
} // namespace regina
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