From 17a6f83cf6408de542ad44ebf4dd3886da3feb33 Mon Sep 17 00:00:00 2001
From: Alexander Vdolainen <alex@vapaa.xyz>
Date: Sat, 1 Jul 2023 22:07:35 +0300
Subject: [PATCH] Issue #5 (alloc/free/list ops are done for exijpeg_data_t).

---
 include/exijpeg.h | 18 +++++++--
 src/Makefile.am   |  2 +-
 src/jpeg.c        | 93 +++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 109 insertions(+), 4 deletions(-)
 create mode 100644 src/jpeg.c

diff --git a/include/exijpeg.h b/include/exijpeg.h
index f216927..f74ca14 100644
--- a/include/exijpeg.h
+++ b/include/exijpeg.h
@@ -26,18 +26,30 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
-#include <getopt.h>
 #include <string.h>
 #include <time.h>
-#include <utime.h>
 
 #include <libexif/exif-data.h>
 
+struct exijpeg_segment {
+    unsigned char *hd;
+    unsigned long length;
+    struct exijpeg_segment *next;
+};
+
 typedef struct __exijpeg_data_type {
     unsigned char *data;
     char *filename;
+    size_t length;
     int fd;
-
+    struct exijpeg_segment *segments;
+    struct exijpeg_segment *last;
 } exijpeg_data_t;
 
+exijpeg_data_t *exijpeg_data_alloc(void);
+
+void exijpeg_data_free(exijpeg_data_t *);
+
+int exijpeg_data_add_segment(exijpeg_data_t *, unsigned char *, unsigned long);
+
 #endif
diff --git a/src/Makefile.am b/src/Makefile.am
index 45cba3c..a65917b 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -11,6 +11,6 @@ AM_CFLAGS = -Wall -g
 
 bin_PROGRAMS = exifdate
 
-exifdate_SOURCES = dtex.c exifdate.c
+exifdate_SOURCES = dtex.c jpeg.c exifdate.c
 
 exifdate_LDADD = $(LIBS) $(LIBEXIF_LIBS)
diff --git a/src/jpeg.c b/src/jpeg.c
new file mode 100644
index 0000000..a3ed06f
--- /dev/null
+++ b/src/jpeg.c
@@ -0,0 +1,93 @@
+/*
+ * EXIF date tool
+ *
+ * (c) Alexander Vdolainen 2023 <alex@vapaa.xyz>
+ *
+ * this 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.
+ *
+ * this 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 <http://www.gnu.org/licenses/>.";
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <string.h>
+#include <time.h>
+
+#include <libexif/exif-data.h>
+
+#include <include/exijpeg.h>
+
+#if 0
+struct exijpeg_segment {
+    unsigned char *hd;
+    unsigned long length;
+    struct exijpeg_segment *next;
+};
+
+typedef struct __exijpeg_data_type {
+    unsigned char *data;
+    char *filename;
+    size_t length;
+    int fd;
+    struct exijpeg_segment *segments;
+    struct exijpeg_segment *last;
+} exijpeg_data_t;
+#endif
+
+exijpeg_data_t *exijpeg_data_alloc(void)
+{
+    exijpeg_data_t *r = malloc(sizeof(exijpeg_data_t));
+
+    if(r) memset(r, 0, sizeof(exijpeg_data_t));
+
+    return r;
+}
+
+void exijpeg_data_free(exijpeg_data_t *s)
+{
+    struct exijpeg_segment *c = NULL;
+    if(!s) return;
+
+    if(s->filename) free(s->filename);
+    if(s->segments) {
+        for(c = s->segments; c != NULL; c = c->next) free(c);
+    }
+
+    return;
+}
+
+int exijpeg_data_add_segment(exijpeg_data_t *s, unsigned char *d, unsigned long l)
+{
+    struct exijpeg_segment *n = NULL;
+
+    if(!s || !d) return -1;
+    if(!(n = malloc(sizeof(struct exijpeg_segment)))) return -1;
+    else {
+        n->hd = d;
+        n->length = l;
+        n->next = NULL;
+    }
+    if(!(s->segments)) {
+        s->segments = n;
+        s->last = n;
+    } else {
+        s->last->next = n;
+        s->last = n;
+    }
+
+    return 0;
+}