/* exif-mnote-data-olympus.c * * Copyright (c) 2002, 2003 Lutz Mueller * * 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 #include "exif-mnote-data-olympus.h" #include #include #include #include #include #define DEBUG /* Uncomment this to fix a problem with Sanyo MakerNotes. It's probably best * not to in most cases because it seems to only affect the thumbnail tag * which is duplicated in IFD 1, and fixing the offset could actually cause * problems with other software that expects the broken form. */ /*#define EXIF_OVERCOME_SANYO_OFFSET_BUG */ static void exif_mnote_data_olympus_clear (ExifMnoteDataOlympus *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_olympus_free (ExifMnoteData *n) { if (!n) return; exif_mnote_data_olympus_clear ((ExifMnoteDataOlympus *) n); } static char * exif_mnote_data_olympus_get_value (ExifMnoteData *d, unsigned int i, char *val, unsigned int maxlen) { ExifMnoteDataOlympus *n = (ExifMnoteDataOlympus *) d; if (!d || !val) return NULL; if (i > n->count -1) return NULL; exif_log (d->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataOlympus", "Querying value for tag '%s'...", mnote_olympus_tag_get_name (n->entries[i].tag)); return mnote_olympus_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 size of the buffer */ static void exif_mnote_data_olympus_save (ExifMnoteData *ne, unsigned char **buf, unsigned int *buf_size) { ExifMnoteDataOlympus *n = (ExifMnoteDataOlympus *) ne; size_t i, o, s, doff, base = 0, o2 = 6 + 2; size_t datao = 0; 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 = 6 + 2 + 2 + n->count * 12; switch (n->version) { case olympusV1: case sanyoV1: case epsonV1: *buf = exif_mem_alloc (ne->mem, *buf_size); if (!*buf) { EXIF_LOG_NO_MEMORY(ne->log, "ExifMnoteDataOlympus", *buf_size); return; } /* Write the header and the number of entries. */ strcpy ((char *)*buf, n->version==sanyoV1?"SANYO": (n->version==epsonV1?"EPSON":"OLYMP")); exif_set_short (*buf + 6, n->order, (ExifShort) 1); datao = n->offset; break; case olympusV2: *buf_size += 8-6 + 4; *buf = exif_mem_alloc (ne->mem, *buf_size); if (!*buf) { EXIF_LOG_NO_MEMORY(ne->log, "ExifMnoteDataOlympus", *buf_size); return; } /* Write the header and the number of entries. */ strcpy ((char *)*buf, "OLYMPUS"); exif_set_short (*buf + 8, n->order, (ExifShort) ( (n->order == EXIF_BYTE_ORDER_INTEL) ? ('I' << 8) | 'I' : ('M' << 8) | 'M')); exif_set_short (*buf + 10, n->order, (ExifShort) 3); o2 += 4; break; case nikonV1: base = MNOTE_NIKON1_TAG_BASE; /* v1 has offsets based to main IFD, not makernote IFD */ datao += n->offset + 10; /* subtract the size here, so the increment in the next case will not harm us */ *buf_size -= 8 + 2; /* Fall through */ case nikonV2: *buf_size += 8 + 2; *buf_size += 4; /* Next IFD pointer */ *buf = exif_mem_alloc (ne->mem, *buf_size); if (!*buf) { EXIF_LOG_NO_MEMORY(ne->log, "ExifMnoteDataOlympus", *buf_size); return; } /* Write the header and the number of entries. */ strcpy ((char *)*buf, "Nikon"); (*buf)[6] = n->version; if (n->version == nikonV2) { exif_set_short (*buf + 10, n->order, (ExifShort) ( (n->order == EXIF_BYTE_ORDER_INTEL) ? ('I' << 8) | 'I' : ('M' << 8) | 'M')); exif_set_short (*buf + 12, n->order, (ExifShort) 0x2A); exif_set_long (*buf + 14, n->order, (ExifShort) 8); o2 += 2 + 8; } datao -= 10; /* Reset next IFD pointer */ exif_set_long (*buf + o2 + 2 + n->count * 12, n->order, 0); break; default: return; } exif_set_short (*buf + o2, n->order, (ExifShort) n->count); o2 += 2; /* Save each entry */ for (i = 0; i < n->count; i++) { o = o2 + i * 12; 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) { doff = *buf_size; ts = *buf_size + s; t = exif_mem_realloc (ne->mem, *buf, sizeof (char) * ts); if (!t) { EXIF_LOG_NO_MEMORY(ne->log, "ExifMnoteDataOlympus", 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); } } } static void exif_mnote_data_olympus_load (ExifMnoteData *en, const unsigned char *buf, unsigned int buf_size) { ExifMnoteDataOlympus *n = (ExifMnoteDataOlympus *) en; ExifShort c; size_t i, tcount, o, o2, datao = 6, base = 0; if (!n || !buf || !buf_size) { exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifMnoteDataOlympus", "Short MakerNote"); return; } o2 = 6 + n->offset; /* Start of interesting data */ if ((o2 + 10 < o2) || (o2 + 10 < 10) || (o2 + 10 > buf_size)) { exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifMnoteDataOlympus", "Short MakerNote"); return; } /* * Olympus headers start with "OLYMP" and need to have at least * a size of 22 bytes (6 for 'OLYMP', 2 other bytes, 2 for the * number of entries, and 12 for one entry. * * Sanyo format is identical and uses identical tags except that * header starts with "SANYO". * * Epson format is identical and uses identical tags except that * header starts with "EPSON". * * Nikon headers start with "Nikon" (6 bytes including '\0'), * version number (1 or 2). * * Version 1 continues with 0, 1, 0, number_of_tags, * or just with number_of_tags (models D1H, D1X...). * * Version 2 continues with an unknown byte (0 or 10), * two unknown bytes (0), "MM" or "II", another byte 0 and * lastly 0x2A. */ if (!memcmp (buf + o2, "OLYMP", 6) || !memcmp (buf + o2, "SANYO", 6) || !memcmp (buf + o2, "EPSON", 6)) { exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataOlympus", "Parsing Olympus/Sanyo/Epson maker note v1..."); /* The number of entries is at position 8. */ if (!memcmp (buf + o2, "SANYO", 6)) n->version = sanyoV1; else if (!memcmp (buf + o2, "EPSON", 6)) n->version = epsonV1; else n->version = olympusV1; if (buf[o2 + 6] == 1) n->order = EXIF_BYTE_ORDER_INTEL; else if (buf[o2 + 6 + 1] == 1) n->order = EXIF_BYTE_ORDER_MOTOROLA; o2 += 8; if (o2 + 2 > buf_size) return; c = exif_get_short (buf + o2, n->order); if ((!(c & 0xFF)) && (c > 0x500)) { if (n->order == EXIF_BYTE_ORDER_INTEL) { n->order = EXIF_BYTE_ORDER_MOTOROLA; } else { n->order = EXIF_BYTE_ORDER_INTEL; } } } else if (!memcmp (buf + o2, "OLYMPUS", 8)) { /* Olympus S760, S770 */ datao = o2; o2 += 8; exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataOlympus", "Parsing Olympus maker note v2 (0x%02x, %02x, %02x, %02x)...", buf[o2], buf[o2 + 1], buf[o2 + 2], buf[o2 + 3]); if ((buf[o2] == 'I') && (buf[o2 + 1] == 'I')) n->order = EXIF_BYTE_ORDER_INTEL; else if ((buf[o2] == 'M') && (buf[o2 + 1] == 'M')) n->order = EXIF_BYTE_ORDER_MOTOROLA; /* The number of entries is at position 8+4. */ n->version = olympusV2; o2 += 4; } else if (!memcmp (buf + o2, "Nikon", 6)) { o2 += 6; exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataOlympus", "Parsing Nikon maker note (0x%02x, %02x, %02x, " "%02x, %02x, %02x, %02x, %02x)...", buf[o2 + 0], buf[o2 + 1], buf[o2 + 2], buf[o2 + 3], buf[o2 + 4], buf[o2 + 5], buf[o2 + 6], buf[o2 + 7]); /* The first byte is the version. */ if (o2 >= buf_size) return; n->version = buf[o2]; o2 += 1; /* Skip an unknown byte (00 or 0A). */ o2 += 1; switch (n->version) { case nikonV1: base = MNOTE_NIKON1_TAG_BASE; /* Fix endianness, if needed */ if (o2 + 2 > buf_size) return; c = exif_get_short (buf + o2, n->order); if ((!(c & 0xFF)) && (c > 0x500)) { if (n->order == EXIF_BYTE_ORDER_INTEL) { n->order = EXIF_BYTE_ORDER_MOTOROLA; } else { n->order = EXIF_BYTE_ORDER_INTEL; } } break; case nikonV2: /* Skip 2 unknown bytes (00 00). */ o2 += 2; /* * Byte order. From here the data offset * gets calculated. */ datao = o2; if (o2 >= buf_size) return; if (!strncmp ((char *)&buf[o2], "II", 2)) n->order = EXIF_BYTE_ORDER_INTEL; else if (!strncmp ((char *)&buf[o2], "MM", 2)) n->order = EXIF_BYTE_ORDER_MOTOROLA; else { exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDatalympus", "Unknown " "byte order '%c%c'", buf[o2], buf[o2 + 1]); return; } o2 += 2; /* Skip 2 unknown bytes (00 2A). */ o2 += 2; /* Go to where the number of entries is. */ if (o2 + 4 > buf_size) return; o2 = datao + exif_get_long (buf + o2, n->order); break; default: exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataOlympus", "Unknown version " "number %i.", n->version); return; } } else if (!memcmp (buf + o2, "\0\x1b", 2)) { n->version = nikonV2; /* 00 1b is # of entries in Motorola order - the rest should also be in MM order */ n->order = EXIF_BYTE_ORDER_MOTOROLA; } else { return; } /* Sanity check the offset */ if ((o2 + 2 < o2) || (o2 + 2 < 2) || (o2 + 2 > buf_size)) { exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifMnoteOlympus", "Short MakerNote"); return; } /* Read the number of tags */ c = exif_get_short (buf + o2, n->order); o2 += 2; /* Remove any old entries */ exif_mnote_data_olympus_clear (n); /* Reserve enough space for all the possible MakerNote tags */ n->entries = exif_mem_alloc (en->mem, sizeof (MnoteOlympusEntry) * c); if (!n->entries) { EXIF_LOG_NO_MEMORY(en->log, "ExifMnoteOlympus", sizeof (MnoteOlympusEntry) * c); return; } /* Parse all c entries, storing ones that are successfully parsed */ tcount = 0; for (i = c, o = o2; 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, "ExifMnoteOlympus", "Short MakerNote"); break; } n->entries[tcount].tag = exif_get_short (buf + o, 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, "ExifMnoteOlympus", "Loading entry 0x%x ('%s')...", n->entries[tcount].tag, mnote_olympus_tag_get_name (n->entries[tcount].tag)); /* exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteOlympus", "0x%x %d %ld*(%d)", n->entries[tcount].tag, n->entries[tcount].format, n->entries[tcount].components, (int)exif_format_get_size(n->entries[tcount].format)); */ /* * 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) + datao; #ifdef EXIF_OVERCOME_SANYO_OFFSET_BUG /* Some Sanyo models (e.g. VPC-C5, C40) suffer from a bug when * writing the offset for the MNOTE_OLYMPUS_TAG_THUMBNAILIMAGE * tag in its MakerNote. The offset is actually the absolute * position in the file instead of the position within the IFD. */ if (dataofs + s > buf_size && n->version == sanyoV1) { /* fix pointer */ dataofs -= datao + 6; exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteOlympus", "Inconsistent thumbnail tag offset; attempting to recover"); } #endif } if ((dataofs + s < dataofs) || (dataofs + s < s) || (dataofs + s > buf_size)) { exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteOlympus", "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, "ExifMnoteOlympus", 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_olympus_count (ExifMnoteData *n) { return n ? ((ExifMnoteDataOlympus *) n)->count : 0; } static unsigned int exif_mnote_data_olympus_get_id (ExifMnoteData *d, unsigned int n) { ExifMnoteDataOlympus *note = (ExifMnoteDataOlympus *) d; if (!note) return 0; if (note->count <= n) return 0; return note->entries[n].tag; } static const char * exif_mnote_data_olympus_get_name (ExifMnoteData *d, unsigned int i) { ExifMnoteDataOlympus *n = (ExifMnoteDataOlympus *) d; if (!n) return NULL; if (i >= n->count) return NULL; return mnote_olympus_tag_get_name (n->entries[i].tag); } static const char * exif_mnote_data_olympus_get_title (ExifMnoteData *d, unsigned int i) { ExifMnoteDataOlympus *n = (ExifMnoteDataOlympus *) d; if (!n) return NULL; if (i >= n->count) return NULL; return mnote_olympus_tag_get_title (n->entries[i].tag); } static const char * exif_mnote_data_olympus_get_description (ExifMnoteData *d, unsigned int i) { ExifMnoteDataOlympus *n = (ExifMnoteDataOlympus *) d; if (!n) return NULL; if (i >= n->count) return NULL; return mnote_olympus_tag_get_description (n->entries[i].tag); } static void exif_mnote_data_olympus_set_byte_order (ExifMnoteData *d, ExifByteOrder o) { ExifByteOrder o_orig; ExifMnoteDataOlympus *n = (ExifMnoteDataOlympus *) 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_olympus_set_offset (ExifMnoteData *n, unsigned int o) { if (n) ((ExifMnoteDataOlympus *) n)->offset = o; } ExifMnoteData * exif_mnote_data_olympus_new (ExifMem *mem) { ExifMnoteData *d; if (!mem) return NULL; d = exif_mem_alloc (mem, sizeof (ExifMnoteDataOlympus)); if (!d) return NULL; exif_mnote_data_construct (d, mem); /* Set up function pointers */ d->methods.free = exif_mnote_data_olympus_free; d->methods.set_byte_order = exif_mnote_data_olympus_set_byte_order; d->methods.set_offset = exif_mnote_data_olympus_set_offset; d->methods.load = exif_mnote_data_olympus_load; d->methods.save = exif_mnote_data_olympus_save; d->methods.count = exif_mnote_data_olympus_count; d->methods.get_id = exif_mnote_data_olympus_get_id; d->methods.get_name = exif_mnote_data_olympus_get_name; d->methods.get_title = exif_mnote_data_olympus_get_title; d->methods.get_description = exif_mnote_data_olympus_get_description; d->methods.get_value = exif_mnote_data_olympus_get_value; return d; }