Add libexif to deps/third_party.

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

+/* exif-mnote-data-pentax.c
+ *
+ * Copyright (c) 2002, 2003 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 "config.h"
+#include "exif-mnote-data-pentax.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+#include <libexif/exif-byte-order.h>
+#include <libexif/exif-utils.h>
+
+static void
+exif_mnote_data_pentax_clear (ExifMnoteDataPentax *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_pentax_free (ExifMnoteData *n)
+{
+        if (!n) return;
+
+        exif_mnote_data_pentax_clear ((ExifMnoteDataPentax *) n);
+}
+
+static char *
+exif_mnote_data_pentax_get_value (ExifMnoteData *d, unsigned int i, char *val, unsigned int maxlen)
+{
+        ExifMnoteDataPentax *n = (ExifMnoteDataPentax *) d;
+
+        if (!n) return NULL;
+        if (n->count <= i) return NULL;
+        return mnote_pentax_entry_get_value (&n->entries[i], val, maxlen);
+}
+
+/** 
+ * @brief save the MnoteData from ne to buf
+ * 
+ * @param ne extract the data from this structure 
+ * @param *buf write the mnoteData to this buffer (buffer will be allocated)
+ * @param buf_size the final size of the buffer
+ */
+static void
+exif_mnote_data_pentax_save (ExifMnoteData *ne,
+                unsigned char **buf, unsigned int *buf_size)
+{
+        ExifMnoteDataPentax *n = (ExifMnoteDataPentax *) ne;
+        size_t i,
+           base = 0,            /* internal MakerNote tag number offset */
+           o2 = 4 + 2;          /* offset to first tag entry, past header */
+        size_t datao = n->offset; /* this MakerNote style uses offsets
+                                  based on main IFD, not makernote IFD */
+
+        if (!n || !buf || !buf_size) return;
+
+        /*
+         * Allocate enough memory for header, the number of entries, entries,
+         * and next IFD pointer
+         */
+        *buf_size = o2 + 2 + n->count * 12 + 4;
+        switch (n->version) {
+        case casioV2:
+                base = MNOTE_PENTAX2_TAG_BASE;
+                *buf = exif_mem_alloc (ne->mem, *buf_size);
+                if (!*buf) {
+                        EXIF_LOG_NO_MEMORY(ne->log, "ExifMnoteDataPentax", *buf_size);
+                        return;
+                }
+                /* Write the magic header */
+                strcpy ((char *)*buf, "QVC");
+                exif_set_short (*buf + 4, n->order, (ExifShort) 0);
+
+                break;
+
+        case pentaxV3:
+                base = MNOTE_PENTAX2_TAG_BASE;
+                *buf = exif_mem_alloc (ne->mem, *buf_size);
+                if (!*buf) {
+                        EXIF_LOG_NO_MEMORY(ne->log, "ExifMnoteDataPentax", *buf_size);
+                        return;
+                }
+
+                /* Write the magic header */
+                strcpy ((char *)*buf, "AOC");
+                exif_set_short (*buf + 4, n->order, (ExifShort) (
+                        (n->order == EXIF_BYTE_ORDER_INTEL) ?
+                        ('I' << 8) | 'I' :
+                        ('M' << 8) | 'M'));
+                break;
+
+        case pentaxV2:
+                base = MNOTE_PENTAX2_TAG_BASE;
+                *buf = exif_mem_alloc (ne->mem, *buf_size);
+                if (!*buf) {
+                        EXIF_LOG_NO_MEMORY(ne->log, "ExifMnoteDataPentax", *buf_size);
+                        return;
+                }
+
+                /* Write the magic header */
+                strcpy ((char *)*buf, "AOC");
+                exif_set_short (*buf + 4, n->order, (ExifShort) 0);
+                break;
+
+        case pentaxV1:
+                /* It looks like this format doesn't have a magic header as
+                 * such, just has a fixed number of entries equal to 0x001b */
+                *buf_size -= 6;
+                o2 -= 6;
+                *buf = exif_mem_alloc (ne->mem, *buf_size);
+                if (!*buf) {
+                        EXIF_LOG_NO_MEMORY(ne->log, "ExifMnoteDataPentax", *buf_size);
+                        return;
+                }
+                break;
+
+        default:
+                /* internal error */
+                return;
+        }
+
+        /* Write the number of entries. */
+        exif_set_short (*buf + o2, n->order, (ExifShort) n->count);
+        o2 += 2;
+
+        /* Save each entry */
+        for (i = 0; i < n->count; i++) {
+                size_t doff;    /* offset to current data portion of tag */
+                size_t s;
+                unsigned char *t;
+                size_t o = o2 + i * 12;   /* current offset into output buffer */
+                exif_set_short (*buf + o + 0, n->order,
+                                (ExifShort) (n->entries[i].tag - base));
+                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) {
+                        size_t ts = *buf_size + s;
+                        doff = *buf_size;
+                        t = exif_mem_realloc (ne->mem, *buf,
+                                                 sizeof (char) * ts);
+                        if (!t) {
+                                EXIF_LOG_NO_MEMORY(ne->log, "ExifMnoteDataPentax", ts);
+                                return;
+                        }
+                        *buf = t;
+                        *buf_size = ts;
+                        exif_set_long (*buf + o, n->order, datao + doff);
+                } else
+                        doff = o;
+
+                /* Write the data. */
+                if (n->entries[i].data) {
+                        memcpy (*buf + doff, n->entries[i].data, s);
+                } else {
+                        /* Most certainly damaged input file */
+                        memset (*buf + doff, 0, s);
+                }
+        }
+
+        /* Sanity check the buffer size */
+        if (*buf_size < (o2 + n->count * 12 + 4)) {
+                exif_log (ne->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifMnoteDataPentax",
+                        "Buffer overflow");
+        }
+
+        /* Reset next IFD pointer */
+        exif_set_long (*buf + o2 + n->count * 12, n->order, 0);
+}
+
+static void
+exif_mnote_data_pentax_load (ExifMnoteData *en,
+                const unsigned char *buf, unsigned int buf_size)
+{
+        ExifMnoteDataPentax *n = (ExifMnoteDataPentax *) en;
+        size_t i, tcount, o, datao, base = 0;
+        ExifShort c;
+
+        if (!n || !buf || !buf_size) {
+                exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA,
+                          "ExifMnoteDataPentax", "Short MakerNote");
+                return;
+        }
+        datao = 6 + n->offset;
+        if ((datao + 8 < datao) || (datao + 8 < 8) || (datao + 8 > buf_size)) {
+                exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA,
+                          "ExifMnoteDataPentax", "Short MakerNote");
+                return;
+        }
+
+        /* Detect variant of Pentax/Casio MakerNote found */
+        if (!memcmp(buf + datao, "AOC", 4)) {
+                if ((buf[datao + 4] == 'I') && (buf[datao + 5] == 'I')) {
+                        n->version = pentaxV3;
+                        n->order = EXIF_BYTE_ORDER_INTEL;
+                } else if ((buf[datao + 4] == 'M') && (buf[datao + 5] == 'M')) {
+                        n->version = pentaxV3;
+                        n->order = EXIF_BYTE_ORDER_MOTOROLA;
+                } else {
+                        /* Uses Casio v2 tags */
+                        n->version = pentaxV2;
+                }
+                exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataPentax",
+                        "Parsing Pentax maker note v%d...", (int)n->version);
+                datao += 4 + 2;
+                base = MNOTE_PENTAX2_TAG_BASE;
+        } else if (!memcmp(buf + datao, "QVC", 4)) {
+                exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataPentax",
+                        "Parsing Casio maker note v2...");
+                n->version = casioV2;
+                base = MNOTE_CASIO2_TAG_BASE;
+                datao += 4 + 2;
+        } else {
+                /* probably assert(!memcmp(buf + datao, "\x00\x1b", 2)) */
+                exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataPentax",
+                        "Parsing Pentax maker note v1...");
+                n->version = pentaxV1;
+        }
+
+        /* Read the number of tags */
+        c = exif_get_short (buf + datao, n->order);
+        datao += 2;
+
+        /* Remove any old entries */
+        exif_mnote_data_pentax_clear (n);
+
+        /* Reserve enough space for all the possible MakerNote tags */
+        n->entries = exif_mem_alloc (en->mem, sizeof (MnotePentaxEntry) * c);
+        if (!n->entries) {
+                EXIF_LOG_NO_MEMORY(en->log, "ExifMnoteDataPentax", sizeof (MnotePentaxEntry) * 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,
+                                  "ExifMnoteDataPentax", "Short MakerNote");
+                        break;
+                }
+
+                n->entries[tcount].tag        = exif_get_short (buf + o + 0, n->order) + base;
+                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, "ExifMnotePentax",
+                          "Loading entry 0x%x ('%s')...", n->entries[tcount].tag,
+                          mnote_pentax_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;
+                        if ((dataofs + s < dataofs) || (dataofs + s < s) ||
+                                (dataofs + s > buf_size)) {
+                                exif_log (en->log, EXIF_LOG_CODE_DEBUG,
+                                                  "ExifMnoteDataPentax", "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, "ExifMnoteDataPentax", 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_pentax_count (ExifMnoteData *n)
+{
+        return n ? ((ExifMnoteDataPentax *) n)->count : 0;
+}
+
+static unsigned int
+exif_mnote_data_pentax_get_id (ExifMnoteData *d, unsigned int n)
+{
+        ExifMnoteDataPentax *note = (ExifMnoteDataPentax *) d;
+
+        if (!note) return 0;
+        if (note->count <= n) return 0;
+        return note->entries[n].tag;
+}
+
+static const char *
+exif_mnote_data_pentax_get_name (ExifMnoteData *d, unsigned int n)
+{
+        ExifMnoteDataPentax *note = (ExifMnoteDataPentax *) d;
+
+        if (!note) return NULL;
+        if (note->count <= n) return NULL;
+        return mnote_pentax_tag_get_name (note->entries[n].tag);
+}
+
+static const char *
+exif_mnote_data_pentax_get_title (ExifMnoteData *d, unsigned int n)
+{
+        ExifMnoteDataPentax *note = (ExifMnoteDataPentax *) d;
+
+        if (!note) return NULL;
+        if (note->count <= n) return NULL;
+        return mnote_pentax_tag_get_title (note->entries[n].tag);
+}
+
+static const char *
+exif_mnote_data_pentax_get_description (ExifMnoteData *d, unsigned int n)
+{
+        ExifMnoteDataPentax *note = (ExifMnoteDataPentax *) d;
+        
+        if (!note) return NULL;
+        if (note->count <= n) return NULL;
+        return mnote_pentax_tag_get_description (note->entries[n].tag);
+}
+
+static void
+exif_mnote_data_pentax_set_offset (ExifMnoteData *d, unsigned int o)
+{
+        if (d) ((ExifMnoteDataPentax *) d)->offset = o;
+}
+
+static void
+exif_mnote_data_pentax_set_byte_order (ExifMnoteData *d, ExifByteOrder o)
+{
+        ExifByteOrder o_orig;
+        ExifMnoteDataPentax *n = (ExifMnoteDataPentax *) 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);
+        }
+}
+
+int
+exif_mnote_data_pentax_identify (const ExifData *ed, const ExifEntry *e)
+{
+        if ((e->size >= 8) && !memcmp (e->data, "AOC", 4)) {
+                if (((e->data[4] == 'I') && (e->data[5] == 'I')) ||
+                    ((e->data[4] == 'M') && (e->data[5] == 'M')))
+                        return pentaxV3;
+                else
+                        /* Uses Casio v2 tags */
+                        return pentaxV2;
+        }
+
+        if ((e->size >= 8) && !memcmp (e->data, "QVC", 4))
+                return casioV2;
+
+        /* This isn't a very robust test, so make sure it's done last */
+        /* Maybe we should additionally check for a make of Asahi or Pentax */
+        if ((e->size >= 2) && (e->data[0] == 0x00) && (e->data[1] == 0x1b))
+                return pentaxV1;
+
+        return 0;
+}
+
+ExifMnoteData *
+exif_mnote_data_pentax_new (ExifMem *mem)
+{
+        ExifMnoteData *d;
+
+        if (!mem) return NULL;
+
+        d = exif_mem_alloc (mem, sizeof (ExifMnoteDataPentax));
+        if (!d) return NULL;
+
+        exif_mnote_data_construct (d, mem);
+
+        /* Set up function pointers */
+        d->methods.free            = exif_mnote_data_pentax_free;
+        d->methods.set_byte_order  = exif_mnote_data_pentax_set_byte_order;
+        d->methods.set_offset      = exif_mnote_data_pentax_set_offset;
+        d->methods.load            = exif_mnote_data_pentax_load;
+        d->methods.save            = exif_mnote_data_pentax_save;
+        d->methods.count           = exif_mnote_data_pentax_count;
+        d->methods.get_id          = exif_mnote_data_pentax_get_id;
+        d->methods.get_name        = exif_mnote_data_pentax_get_name;
+        d->methods.get_title       = exif_mnote_data_pentax_get_title;
+        d->methods.get_description = exif_mnote_data_pentax_get_description;
+        d->methods.get_value       = exif_mnote_data_pentax_get_value;
+
+        return d;
+}