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/*
* Glib convenience functions
*
* Copyright IBM Corp. 2022
*
* s390-tools is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See LICENSE for details.
*/
/* Must be included before any other header */
#include "config.h"
#include <errno.h>
#include <openssl/crypto.h>
#include "libpv/glib-helper.h"
struct __data {
void *data;
size_t size;
GFreeFunc free_func;
};
static void __data_clear_and_free(void *p)
{
struct __data *ptr = p;
if (!ptr)
return;
if (ptr->data) {
OPENSSL_cleanse(ptr->data, ptr->size);
ptr->free_func(ptr->data);
}
g_free(ptr);
}
static GBytes *pv_sec_gbytes_new_take_func(void *data, size_t size, GFreeFunc free_func)
{
struct __data *tmp = g_new(struct __data, 1);
tmp->data = data;
tmp->size = size;
tmp->free_func = free_func;
return g_bytes_new_with_free_func(data, size, __data_clear_and_free, tmp);
}
GBytes *pv_sec_gbytes_new_take(void *data, size_t size)
{
return pv_sec_gbytes_new_take_func(data, size, g_free);
}
GBytes *pv_sec_gbytes_new(const void *data, size_t size)
{
g_autofree void *tmp_data = NULL;
g_return_val_if_fail(data || size != 0, NULL);
tmp_data = g_malloc(size);
memcpy(tmp_data, data, size);
return pv_sec_gbytes_new_take(g_steal_pointer(&tmp_data), size);
}
int pv_file_seek(FILE *file, long offset, int whence, GError **error)
{
int cached_errno;
int ret = fseek(file, offset, whence);
if (ret) {
cached_errno = errno;
g_set_error(error, PV_GLIB_HELPER_ERROR, PV_GLIB_HELPER_FILE_ERROR,
"Cannot seek: %s", g_strerror(cached_errno));
}
return ret;
}
size_t pv_file_write(FILE *file, const void *ptr, size_t size, GError **error)
{
int cached_errno;
size_t n = fwrite(ptr, 1, size, file);
if (n != size) {
cached_errno = errno;
g_set_error(error, PV_GLIB_HELPER_ERROR, PV_GLIB_HELPER_FILE_ERROR,
"Cannot write: %s", g_strerror(cached_errno));
}
return n;
}
long pv_file_close(FILE *file, GError **error)
{
int cached_errno;
int ret = fclose(file);
if (ret) {
cached_errno = errno;
g_set_error(error, PV_GLIB_HELPER_ERROR, PV_GLIB_HELPER_FILE_ERROR,
"Cannot close: %s", g_strerror(cached_errno));
}
return ret;
}
void pv_auto_close_file(FILE *file)
{
if (!file)
return;
(void)pv_file_close(file, NULL);
}
long pv_file_tell(FILE *file, GError **error)
{
int cached_errno;
long n = ftell(file);
if (n < 0) {
cached_errno = errno;
g_set_error(error, PV_GLIB_HELPER_ERROR, PV_GLIB_HELPER_FILE_ERROR,
"Cannot tell: %s", g_strerror(cached_errno));
}
return n;
}
FILE *pv_file_open(const char *filename, const char *mode, GError **error)
{
FILE *file = fopen(filename, mode);
int cached_errno;
if (!file) {
cached_errno = errno;
g_set_error(error, PV_GLIB_HELPER_ERROR, PV_GLIB_HELPER_FILE_ERROR,
"Cannot open '%s'. %s", filename, g_strerror(cached_errno));
return NULL;
}
return file;
}
GBytes *pv_file_get_content_as_g_bytes(const char *filename, GError **error)
{
g_autofree char *data = NULL;
size_t data_size;
if (!g_file_get_contents(filename, &data, &data_size, error))
return NULL;
return g_bytes_new_take(g_steal_pointer(&data), data_size);
}
GBytes *pv_file_get_content_as_secure_bytes(const char *filename)
{
g_autoptr(FILE) f = fopen(filename, "rb");
g_autofree char *data = NULL;
ssize_t file_size;
size_t data_size;
if (!f)
return NULL;
fseek(f, 0, SEEK_END);
file_size = ftell(f);
if (file_size < 0)
return NULL;
data_size = (size_t)file_size;
fseek(f, 0, SEEK_SET);
data = g_malloc0(data_size);
if (data_size != fread(data, 1, data_size, f))
return NULL;
return pv_sec_gbytes_new_take(g_steal_pointer(&data), data_size);
}
void *pv_gbytes_memcpy(void *dst, size_t dst_size, GBytes *src, size_t *copied)
{
size_t src_size;
const void *src_data = g_bytes_get_data(src, &src_size);
if (dst_size < src_size)
return NULL;
if (copied)
*copied = src_size;
return memcpy(dst, src_data, src_size);
}
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