int avro_file_reader(const char *path, avro_file_reader_t * reader)
{
int rval;
FILE *fp;
avro_file_reader_t r = malloc(sizeof(struct avro_file_reader_t_));
if (!r) {
return ENOMEM;
}
fp = fopen(path, "r");
if (!fp) {
return errno;
}
r->reader = avro_reader_file(fp);
if (!r->reader) {
return ENOMEM;
}
rval = file_read_header(r->reader, &r->writers_schema, r->sync,
sizeof(r->sync));
if (rval == 0) {
rval = file_read_block_count(r);
if (rval == 0) {
*reader = r;
}
}
return rval;
}
static int file_writer_open(const char *path, avro_file_writer_t w)
{
int rval;
FILE *fp;
avro_reader_t reader;
fp = fopen(path, "r");
if (!fp) {
return errno;
}
reader = avro_reader_file(fp);
if (!reader) {
return ENOMEM;
}
rval =
file_read_header(reader, &w->writers_schema, w->sync,
sizeof(w->sync));
avro_reader_free(reader);
/* Position to end of file and get ready to write */
rval = file_writer_init_fp(path, "a", w);
if (rval) {
free(w);
}
return rval;
}
static GwyContainer*
ezdfile_load(const gchar *filename,
G_GNUC_UNUSED GwyRunType mode,
GError **error)
{
GwyContainer *meta, *container = NULL;
guchar *buffer = NULL;
gsize size = 0;
GError *err = NULL;
EZDSection *section = NULL;
GwyDataField *dfield = NULL;
GPtrArray *ezdfile;
guint header_size, n;
gint i;
gchar *p;
if (!gwy_file_get_contents(filename, &buffer, &size, &err)) {
err_GET_FILE_CONTENTS(error, &err);
return NULL;
}
if (strncmp(buffer, MAGIC, MAGIC_SIZE)
|| !(header_size = find_data_start(buffer, size))) {
err_FILE_TYPE(error, "EZD/NID");
gwy_file_abandon_contents(buffer, size, NULL);
return NULL;
}
ezdfile = g_ptr_array_new();
p = g_strndup(buffer, header_size - DATA_MAGIC_SIZE);
if (!file_read_header(ezdfile, p, error)) {
gwy_file_abandon_contents(buffer, size, NULL);
g_free(p);
return NULL;
}
g_free(p);
n = find_data_offsets(buffer + header_size, size - header_size, ezdfile,
error);
if (!n) {
gwy_file_abandon_contents(buffer, size, NULL);
return NULL;
}
container = gwy_container_new();
i = 0;
for (n = 0; n < ezdfile->len; n++) {
gchar key[24];
section = (EZDSection*)g_ptr_array_index(ezdfile, n);
if (!section->data)
continue;
dfield = gwy_data_field_new(section->xres, section->yres,
1.0, 1.0, FALSE);
read_data_field(dfield, section);
g_snprintf(key, sizeof(key), "/%d/data", i);
gwy_container_set_object_by_name(container, key, dfield);
g_object_unref(dfield);
fix_scales(section, i, container);
meta = ezdfile_get_metadata(ezdfile, n);
if (meta) {
g_snprintf(key, sizeof(key), "/%d/meta", i);
gwy_container_set_object_by_name(container, key, meta);
g_object_unref(meta);
}
i++;
}
gwy_file_abandon_contents(buffer, size, NULL);
ezdfile_free(ezdfile);
return container;
}
