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// Copyright (C) 2020-2023 Free Software Foundation, Inc.
// This file is part of GCC.
// GCC 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 3, or (at your option) any later
// version.
// GCC 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 GCC; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
#include "rust-extern-crate.h"
#include "rust-diagnostics.h"
#include "rust-export-metadata.h"
#include "md5.h"
namespace Rust {
namespace Imports {
ExternCrate::ExternCrate (Import::Stream &stream) : import_stream (stream) {}
ExternCrate::~ExternCrate () {}
bool
ExternCrate::ok () const
{
return !import_stream.saw_error ();
}
bool
ExternCrate::load (Location locus)
{
// match header
import_stream.require_bytes (locus, Metadata::kMagicHeader,
sizeof (Metadata::kMagicHeader));
if (import_stream.saw_error ())
return false;
// parse 16 bytes md5
unsigned char checksum[16];
bool ok
= import_stream.do_peek (sizeof (checksum), (const char **) &checksum);
if (!ok)
return false;
import_stream.advance (sizeof (checksum));
// parse delim
import_stream.require_bytes (locus, Metadata::kSzDelim,
sizeof (Metadata::kSzDelim));
if (import_stream.saw_error ())
return false;
// parse crate name
bool saw_delim = false;
while (!import_stream.saw_error () && !import_stream.at_eof ())
{
unsigned char byte = import_stream.get_char ();
saw_delim
= memcmp (&byte, Metadata::kSzDelim, sizeof (Metadata::kSzDelim)) == 0;
if (saw_delim)
break;
crate_name += byte;
}
if (!saw_delim || crate_name.empty ())
{
import_stream.set_saw_error ();
rust_error_at (locus, "failed to read crate name field");
return false;
}
// read until delim which is the size of the meta data
std::string metadata_length_buffer;
saw_delim = false;
while (!import_stream.saw_error () && !import_stream.at_eof ())
{
unsigned char byte = import_stream.get_char ();
saw_delim
= memcmp (&byte, Metadata::kSzDelim, sizeof (Metadata::kSzDelim)) == 0;
if (saw_delim)
break;
metadata_length_buffer += byte;
}
if (!saw_delim || metadata_length_buffer.empty ())
{
import_stream.set_saw_error ();
rust_error_at (locus, "failed to read metatadata size");
return false;
}
// interpret the string size
int expected_buffer_length = -1;
ok = ExternCrate::string_to_int (locus, metadata_length_buffer, false,
&expected_buffer_length);
if (!ok)
return false;
// read the parsed size and it should be eof
metadata_buffer.reserve (expected_buffer_length);
for (int i = 0; i < expected_buffer_length && !import_stream.saw_error ()
&& !import_stream.at_eof ();
i++)
{
metadata_buffer += import_stream.get_char ();
}
// compute the md5
struct md5_ctx chksm;
unsigned char computed_checksum[16];
md5_init_ctx (&chksm);
md5_process_bytes (metadata_buffer.c_str (), metadata_buffer.size (), &chksm);
md5_finish_ctx (&chksm, computed_checksum);
// FIXME i think the encoding and decoding of md5 is going wrong or else we
// are not computing it correctly
//
// compare the checksums
// if (memcmp(computed_checksum, checksum, sizeof (checksum)) != 0)
// {
// rust_error_at (locus,
// "checksum mismatch in metadata: %<%.*s%> vs %<%.*s%>",
// sizeof (computed_checksum), computed_checksum,
// sizeof (checksum), checksum);
// return false;
// }
// all good
return true;
}
const std::string &
ExternCrate::get_crate_name () const
{
return crate_name;
}
const std::string &
ExternCrate::get_metadata () const
{
return metadata_buffer;
}
// Turn a string into a integer with appropriate error handling.
bool
ExternCrate::string_to_int (Location locus, const std::string &s,
bool is_neg_ok, int *ret)
{
char *end;
long prio = strtol (s.c_str (), &end, 10);
if (*end != '\0' || prio > 0x7fffffff || (prio < 0 && !is_neg_ok))
{
rust_error_at (locus, "invalid integer in import data");
return false;
}
*ret = prio;
return true;
}
} // namespace Imports
} // namespace Rust
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