Add libexif to deps/third_party.

libexif/sources/libexif/fuji/exif-mnote-data-fuji.c

+/* exif-mnote-data-fuji.c
+ *
+ * Copyright (c) 2002 Lutz Mueller <lutz@users.sourceforge.net>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details. 
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301  USA.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+
+#include <config.h>
+#include <libexif/exif-byte-order.h>
+#include <libexif/exif-utils.h>
+
+#include "exif-mnote-data-fuji.h"
+
+struct _MNoteFujiDataPrivate {
+        ExifByteOrder order;
+};
+
+static void
+exif_mnote_data_fuji_clear (ExifMnoteDataFuji *n)
+{
+        ExifMnoteData *d = (ExifMnoteData *) n;
+        unsigned int i;
+
+        if (!n) return;
+
+        if (n->entries) {
+                for (i = 0; i < n->count; i++)
+                        if (n->entries[i].data) {
+                                exif_mem_free (d->mem, n->entries[i].data);
+                                n->entries[i].data = NULL;
+                        }
+                exif_mem_free (d->mem, n->entries);
+                n->entries = NULL;
+                n->count = 0;
+        }
+}
+
+static void
+exif_mnote_data_fuji_free (ExifMnoteData *n)
+{
+        if (!n) return;
+
+        exif_mnote_data_fuji_clear ((ExifMnoteDataFuji *) n);
+}
+
+static char *
+exif_mnote_data_fuji_get_value (ExifMnoteData *d, unsigned int i, char *val, unsigned int maxlen)
+{
+        ExifMnoteDataFuji *n = (ExifMnoteDataFuji *) d;
+
+        if (!d || !val) return NULL;
+        if (i > n->count -1) return NULL;
+/*
+        exif_log (d->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataFuji",
+                  "Querying value for tag '%s'...",
+                  mnote_fuji_tag_get_name (n->entries[i].tag));
+*/
+        return mnote_fuji_entry_get_value (&n->entries[i], val, maxlen);
+}
+
+static void
+exif_mnote_data_fuji_save (ExifMnoteData *ne, unsigned char **buf,
+                           unsigned int *buf_size)
+{
+        ExifMnoteDataFuji *n = (ExifMnoteDataFuji *) ne;
+        size_t i, o, s, doff;
+        unsigned char *t;
+        size_t ts;
+
+        if (!n || !buf || !buf_size) return;
+
+        /*
+         * Allocate enough memory for all entries and the number
+         * of entries.
+         */
+        *buf_size = 8 + 4 + 2 + n->count * 12 + 4;
+        *buf = exif_mem_alloc (ne->mem, *buf_size);
+        if (!*buf) {
+                *buf_size = 0;
+                return;
+        }
+
+        /*
+         * Header: "FUJIFILM" and 4 bytes offset to the first entry.
+         * As the first entry will start right thereafter, the offset is 12.
+         */
+        memcpy (*buf, "FUJIFILM", 8);
+        exif_set_long (*buf + 8, n->order, 12);
+
+        /* Save the number of entries */
+        exif_set_short (*buf + 8 + 4, n->order, (ExifShort) n->count);
+        
+        /* Save each entry */
+        for (i = 0; i < n->count; i++) {
+                o = 8 + 4 + 2 + i * 12;
+                exif_set_short (*buf + o + 0, n->order, (ExifShort) n->entries[i].tag);
+                exif_set_short (*buf + o + 2, n->order, (ExifShort) n->entries[i].format);
+                exif_set_long  (*buf + o + 4, n->order, n->entries[i].components);
+                o += 8;
+                s = exif_format_get_size (n->entries[i].format) *
+                                                n->entries[i].components;
+                if (s > 65536) {
+                        /* Corrupt data: EXIF data size is limited to the
+                         * maximum size of a JPEG segment (64 kb).
+                         */
+                        continue;
+                }
+                if (s > 4) {
+                        ts = *buf_size + s;
+
+                        /* Ensure even offsets. Set padding bytes to 0. */
+                        if (s & 1) ts += 1;
+                        t = exif_mem_realloc (ne->mem, *buf, ts);
+                        if (!t) {
+                                return;
+                        }
+                        *buf = t;
+                        *buf_size = ts;
+                        doff = *buf_size - s;
+                        if (s & 1) { doff--; *(*buf + *buf_size - 1) = '\0'; }
+                        exif_set_long (*buf + o, n->order, doff);
+                } else
+                        doff = o;
+
+                /*
+                 * Write the data. Fill unneeded bytes with 0. Do not
+                 * crash if data is NULL.
+                 */
+                if (!n->entries[i].data) memset (*buf + doff, 0, s);
+                else memcpy (*buf + doff, n->entries[i].data, s);
+        }
+}
+
+static void
+exif_mnote_data_fuji_load (ExifMnoteData *en,
+        const unsigned char *buf, unsigned int buf_size)
+{
+        ExifMnoteDataFuji *n = (ExifMnoteDataFuji*) en;
+        ExifLong c;
+        size_t i, tcount, o, datao;
+
+        if (!n || !buf || !buf_size) {
+                exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA,
+                          "ExifMnoteDataFuji", "Short MakerNote");
+                return;
+        }
+        datao = 6 + n->offset;
+        if ((datao + 12 < datao) || (datao + 12 < 12) || (datao + 12 > buf_size)) {
+                exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA,
+                          "ExifMnoteDataFuji", "Short MakerNote");
+                return;
+        }
+
+        n->order = EXIF_BYTE_ORDER_INTEL;
+        datao += exif_get_long (buf + datao + 8, EXIF_BYTE_ORDER_INTEL);
+        if ((datao + 2 < datao) || (datao + 2 < 2) ||
+            (datao + 2 > buf_size)) {
+                exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA,
+                          "ExifMnoteDataFuji", "Short MakerNote");
+                return;
+        }
+
+        /* Read the number of tags */
+        c = exif_get_short (buf + datao, EXIF_BYTE_ORDER_INTEL);
+        datao += 2;
+
+        /* Remove any old entries */
+        exif_mnote_data_fuji_clear (n);
+
+        /* Reserve enough space for all the possible MakerNote tags */
+        n->entries = exif_mem_alloc (en->mem, sizeof (MnoteFujiEntry) * c);
+        if (!n->entries) {
+                EXIF_LOG_NO_MEMORY(en->log, "ExifMnoteDataFuji", sizeof (MnoteFujiEntry) * c);
+                return;
+        }
+
+        /* Parse all c entries, storing ones that are successfully parsed */
+        tcount = 0;
+        for (i = c, o = datao; i; --i, o += 12) {
+                size_t s;
+                if ((o + 12 < o) || (o + 12 < 12) || (o + 12 > buf_size)) {
+                        exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA,
+                                  "ExifMnoteDataFuji", "Short MakerNote");
+                        break;
+                }
+
+                n->entries[tcount].tag        = exif_get_short (buf + o, n->order);
+                n->entries[tcount].format     = exif_get_short (buf + o + 2, n->order);
+                n->entries[tcount].components = exif_get_long (buf + o + 4, n->order);
+                n->entries[tcount].order      = n->order;
+
+                exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataFuji",
+                          "Loading entry 0x%x ('%s')...", n->entries[tcount].tag,
+                          mnote_fuji_tag_get_name (n->entries[tcount].tag));
+
+                /*
+                 * Size? If bigger than 4 bytes, the actual data is not
+                 * in the entry but somewhere else (offset).
+                 */
+                s = exif_format_get_size (n->entries[tcount].format) * n->entries[tcount].components;
+                n->entries[tcount].size = s;
+                if (s) {
+                        size_t dataofs = o + 8;
+                        if (s > 4)
+                                /* The data in this case is merely a pointer */
+                                dataofs = exif_get_long (buf + dataofs, n->order) + 6 + n->offset;
+                        if ((dataofs + s < dataofs) || (dataofs + s < s) ||
+                                (dataofs + s >= buf_size)) {
+                                exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA,
+                                                  "ExifMnoteDataFuji", "Tag data past end of "
+                                          "buffer (%u >= %u)", dataofs + s, buf_size);
+                                continue;
+                        }
+
+                        n->entries[tcount].data = exif_mem_alloc (en->mem, s);
+                        if (!n->entries[tcount].data) {
+                                EXIF_LOG_NO_MEMORY(en->log, "ExifMnoteDataFuji", s);
+                                continue;
+                        }
+                        memcpy (n->entries[tcount].data, buf + dataofs, s);
+                }
+
+                /* Tag was successfully parsed */
+                ++tcount;
+        }
+        /* Store the count of successfully parsed tags */
+        n->count = tcount;
+}
+
+static unsigned int
+exif_mnote_data_fuji_count (ExifMnoteData *n)
+{
+        return n ? ((ExifMnoteDataFuji *) n)->count : 0;
+}
+
+static unsigned int
+exif_mnote_data_fuji_get_id (ExifMnoteData *d, unsigned int n)
+{
+        ExifMnoteDataFuji *note = (ExifMnoteDataFuji *) d;
+
+        if (!note) return 0;
+        if (note->count <= n) return 0;
+        return note->entries[n].tag;
+}
+
+static const char *
+exif_mnote_data_fuji_get_name (ExifMnoteData *d, unsigned int i)
+{
+        ExifMnoteDataFuji *n = (ExifMnoteDataFuji *) d;
+
+        if (!n) return NULL;
+        if (i >= n->count) return NULL;
+        return mnote_fuji_tag_get_name (n->entries[i].tag);
+}
+
+static const char *
+exif_mnote_data_fuji_get_title (ExifMnoteData *d, unsigned int i)
+{
+        ExifMnoteDataFuji *n = (ExifMnoteDataFuji *) d;
+        
+        if (!n) return NULL;
+        if (i >= n->count) return NULL;
+        return mnote_fuji_tag_get_title (n->entries[i].tag);
+}
+
+static const char *
+exif_mnote_data_fuji_get_description (ExifMnoteData *d, unsigned int i)
+{
+        ExifMnoteDataFuji *n = (ExifMnoteDataFuji *) d;
+        
+        if (!n) return NULL;
+        if (i >= n->count) return NULL;
+        return mnote_fuji_tag_get_description (n->entries[i].tag);
+}
+
+static void
+exif_mnote_data_fuji_set_byte_order (ExifMnoteData *d, ExifByteOrder o)
+{
+        ExifByteOrder o_orig;
+        ExifMnoteDataFuji *n = (ExifMnoteDataFuji *) d;
+        unsigned int i;
+
+        if (!n) return;
+
+        o_orig = n->order;
+        n->order = o;
+        for (i = 0; i < n->count; i++) {
+                n->entries[i].order = o;
+                exif_array_set_byte_order (n->entries[i].format, n->entries[i].data,
+                                n->entries[i].components, o_orig, o);
+        }
+}
+
+static void
+exif_mnote_data_fuji_set_offset (ExifMnoteData *n, unsigned int o)
+{
+        if (n) ((ExifMnoteDataFuji *) n)->offset = o;
+}
+
+int
+exif_mnote_data_fuji_identify (const ExifData *ed, const ExifEntry *e)
+{
+        return ((e->size >= 12) && !memcmp (e->data, "FUJIFILM", 8));
+}
+
+ExifMnoteData *
+exif_mnote_data_fuji_new (ExifMem *mem)
+{
+        ExifMnoteData *d;
+
+        if (!mem) return NULL;
+
+        d = exif_mem_alloc (mem, sizeof (ExifMnoteDataFuji));
+        if (!d) return NULL;
+
+        exif_mnote_data_construct (d, mem);
+
+        /* Set up function pointers */
+        d->methods.free            = exif_mnote_data_fuji_free;
+        d->methods.set_byte_order  = exif_mnote_data_fuji_set_byte_order;
+        d->methods.set_offset      = exif_mnote_data_fuji_set_offset;
+        d->methods.load            = exif_mnote_data_fuji_load;
+        d->methods.save            = exif_mnote_data_fuji_save;
+        d->methods.count           = exif_mnote_data_fuji_count;
+        d->methods.get_id          = exif_mnote_data_fuji_get_id;
+        d->methods.get_name        = exif_mnote_data_fuji_get_name;
+        d->methods.get_title       = exif_mnote_data_fuji_get_title;
+        d->methods.get_description = exif_mnote_data_fuji_get_description;
+        d->methods.get_value       = exif_mnote_data_fuji_get_value;
+
+        return d;
+}