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Filename: dc_token.c
```c
#include "dc_context.h"
#include "dc_token.h"
void dc_token_save(dc_context_t* context, dc_tokennamespc_t namespc, uint32_t foreign_id, const char* token)
{
sqlite3_stmt* stmt = NULL;
if (context==NULL || context->magic!=DC_CONTEXT_MAGIC || token==NULL) { // foreign_id may be 0
goto cleanup;
}
stmt = dc_sqlite3_prepare(context->sql,
"INSERT INTO tokens (namespc, foreign_id, token, timestamp) VALUES (?, ?, ?, ?);");
sqlite3_bind_int (stmt, 1, (int)namespc);
sqlite3_bind_int (stmt, 2, (int)foreign_id);
sqlite3_bind_text (stmt, 3, token, -1, SQLITE_STATIC);
sqlite3_bind_int64(stmt, 4, time(NULL));
sqlite3_step(stmt);
cleanup:
sqlite3_finalize(stmt);
}
char* dc_token_lookup(dc_context_t* context, dc_tokennamespc_t namespc, uint32_t foreign_id)
{
char* token = NULL;
sqlite3_stmt* stmt = NULL;
if (context==NULL || context->magic!=DC_CONTEXT_MAGIC) {
goto cleanup;
}
stmt = dc_sqlite3_prepare(context->sql,
"SELECT token FROM tokens WHERE namespc=? AND foreign_id=?;");
sqlite3_bind_int (stmt, 1, (int)namespc);
sqlite3_bind_int (stmt, 2, (int)foreign_id);
sqlite3_step(stmt);
token = dc_strdup_keep_null((char*)sqlite3_column_text(stmt, 0));
cleanup:
sqlite3_finalize(stmt);
return token;
}
int dc_token_exists(dc_context_t* context, dc_tokennamespc_t namespc, const char* token)
{
int exists = 0;
sqlite3_stmt* stmt = NULL;
if (context==NULL || context->magic!=DC_CONTEXT_MAGIC || token==NULL) {
goto cleanup;
}
stmt = dc_sqlite3_prepare(context->sql,
"SELECT id FROM tokens WHERE namespc=? AND token=?;");
sqlite3_bind_int (stmt, 1, (int)namespc);
sqlite3_bind_text(stmt, 2, token, -1, SQLITE_STATIC);
exists = (sqlite3_step(stmt)!=0);
cleanup:
sqlite3_finalize(stmt);
return exists;
}
```
Filename: dc_tools.c
```c
#include <stdarg.h>
#include <ctype.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h> /* for getpid() */
#include <unistd.h> /* for getpid() */
#include <openssl/rand.h>
#include <libetpan/libetpan.h>
#include <libetpan/mailimap_types.h>
#include "dc_context.h"
/*******************************************************************************
* Math tools
******************************************************************************/
int dc_exactly_one_bit_set(int v)
{
return (v && !(v & (v - 1))); /* via http://www.graphics.stanford.edu/~seander/bithacks.html#DetermineIfPowerOf2 */
}