4 * Copyright (C) 2008 - 2011 The Geeqie Team
6 * Author: Vladimir Nadvornik
8 * This software is released under the GNU General Public License (GNU GPL).
9 * Please read the included file COPYING for more information.
10 * This software comes with no warranty of any kind, use at your own risk!
14 #include "jpeg_parser.h"
16 gboolean jpeg_segment_find(const guchar *data, guint size,
17 guchar app_marker, const gchar *magic, guint magic_len,
18 guint *seg_offset, guint *seg_length)
24 while (marker != JPEG_MARKER_EOI)
29 if (offset + 2 >= size ||
30 data[offset] != JPEG_MARKER) return FALSE;
32 marker = data[offset + 1];
33 if (marker != JPEG_MARKER_SOI &&
34 marker != JPEG_MARKER_EOI)
36 if (offset + 4 >= size) return FALSE;
37 length += ((guint)data[offset + 2] << 8) + data[offset + 3];
39 if (marker == app_marker &&
40 offset + length < size &&
41 length >= 4 + magic_len &&
42 memcmp(data + offset + 4, magic, magic_len) == 0)
44 *seg_offset = offset + 4;
45 *seg_length = length - 4;
55 TIFF_BYTE_ORDER_INTEL,
56 TIFF_BYTE_ORDER_MOTOROLA
59 #define TIFF_TIFD_OFFSET_TAG 0
60 #define TIFF_TIFD_OFFSET_FORMAT 2
61 #define TIFF_TIFD_OFFSET_COUNT 4
62 #define TIFF_TIFD_OFFSET_DATA 8
63 #define TIFF_TIFD_SIZE 12
67 guint16 tiff_byte_get_int16(const guchar *f, TiffByteOrder bo)
71 memcpy(&align_buf, f, sizeof(guint16));
73 if (bo == TIFF_BYTE_ORDER_INTEL)
74 return GUINT16_FROM_LE(align_buf);
76 return GUINT16_FROM_BE(align_buf);
79 guint32 tiff_byte_get_int32(const guchar *f, TiffByteOrder bo)
83 memcpy(&align_buf, f, sizeof(guint32));
85 if (bo == TIFF_BYTE_ORDER_INTEL)
86 return GUINT32_FROM_LE(align_buf);
88 return GUINT32_FROM_BE(align_buf);
91 void tiff_byte_put_int16(guchar *f, guint16 n, TiffByteOrder bo)
95 if (bo == TIFF_BYTE_ORDER_INTEL)
97 align_buf = GUINT16_TO_LE(n);
101 align_buf = GUINT16_TO_BE(n);
104 memcpy(f, &align_buf, sizeof(guint16));
107 void tiff_byte_put_int32(guchar *f, guint32 n, TiffByteOrder bo)
111 if (bo == TIFF_BYTE_ORDER_INTEL)
113 align_buf = GUINT32_TO_LE(n);
117 align_buf = GUINT32_TO_BE(n);
120 memcpy(f, &align_buf, sizeof(guint32));
123 gint tiff_directory_offset(const guchar *data, const guint len,
124 guint *offset, TiffByteOrder *bo)
126 if (len < 8) return FALSE;
128 if (memcmp(data, "II", 2) == 0)
130 *bo = TIFF_BYTE_ORDER_INTEL;
132 else if (memcmp(data, "MM", 2) == 0)
134 *bo = TIFF_BYTE_ORDER_MOTOROLA;
141 if (tiff_byte_get_int16(data + 2, *bo) != 0x002A)
146 *offset = tiff_byte_get_int32(data + 4, *bo);
148 return (*offset < len);
151 typedef gint (* FuncParseIFDEntry)(const guchar *tiff, guint offset,
152 guint size, TiffByteOrder bo,
156 gint tiff_parse_IFD_table(const guchar *tiff, guint offset,
157 guint size, TiffByteOrder bo,
159 FuncParseIFDEntry parse_entry, gpointer data)
166 /* We should be able to read number of entries in IFD0) */
167 if (size < offset + 2) return -1;
169 count = tiff_byte_get_int16(tiff + offset, bo);
171 /* Entries and next IFD offset must be readable */
172 if (size < offset + count * TIFF_TIFD_SIZE + 4) return -1;
174 for (i = 0; i < count; i++)
176 parse_entry(tiff, offset + i * TIFF_TIFD_SIZE, size, bo, data);
179 next = tiff_byte_get_int32(tiff + offset + count * TIFF_TIFD_SIZE, bo);
180 if (next_offset) *next_offset = next;
185 static gint mpo_parse_Index_IFD_entry(const guchar *tiff, guint offset,
186 guint size, TiffByteOrder bo,
198 tag = tiff_byte_get_int16(tiff + offset + TIFF_TIFD_OFFSET_TAG, bo);
199 format = tiff_byte_get_int16(tiff + offset + TIFF_TIFD_OFFSET_FORMAT, bo);
200 count = tiff_byte_get_int32(tiff + offset + TIFF_TIFD_OFFSET_COUNT, bo);
201 data_val = tiff_byte_get_int32(tiff + offset + TIFF_TIFD_OFFSET_DATA, bo);
202 DEBUG_1(" tag %x format %x count %x data_val %x", tag, format, count, data_val);
206 mpo->version = data_val;
207 DEBUG_1(" mpo version %x", mpo->version);
209 else if (tag == 0xb001)
211 mpo->num_images = data_val;
212 DEBUG_1(" num images %x", mpo->num_images);
214 else if (tag == 0xb002)
217 data_offset = data_val;
219 if (size < data_offset || size < data_offset + data_length)
223 if (count != mpo->num_images * 16)
228 mpo->images = g_new0(MPOEntry, mpo->num_images);
230 for (i = 0; i < mpo->num_images; i++) {
231 guint image_attr = tiff_byte_get_int32(tiff + data_offset + i * 16, bo);
232 mpo->images[i].type_code = image_attr & 0xffffff;
233 mpo->images[i].representative = !!(image_attr & 0x20000000);
234 mpo->images[i].dependent_child = !!(image_attr & 0x40000000);
235 mpo->images[i].dependent_parent = !!(image_attr & 0x80000000);
236 mpo->images[i].length = tiff_byte_get_int32(tiff + data_offset + i * 16 + 4, bo);
237 mpo->images[i].offset = tiff_byte_get_int32(tiff + data_offset + i * 16 + 8, bo);
238 mpo->images[i].dep1 = tiff_byte_get_int16(tiff + data_offset + i * 16 + 12, bo);
239 mpo->images[i].dep2 = tiff_byte_get_int16(tiff + data_offset + i * 16 + 14, bo);
243 mpo->images[i].offset = 0;
247 mpo->images[i].offset += mpo->mpo_offset;
250 DEBUG_1(" image %x %x %x", image_attr, mpo->images[i].length, mpo->images[i].offset);
257 static gint mpo_parse_Attributes_IFD_entry(const guchar *tiff, guint offset,
258 guint size, TiffByteOrder bo,
266 MPOEntry *mpe = data;
268 tag = tiff_byte_get_int16(tiff + offset + TIFF_TIFD_OFFSET_TAG, bo);
269 format = tiff_byte_get_int16(tiff + offset + TIFF_TIFD_OFFSET_FORMAT, bo);
270 count = tiff_byte_get_int32(tiff + offset + TIFF_TIFD_OFFSET_COUNT, bo);
271 data_val = tiff_byte_get_int32(tiff + offset + TIFF_TIFD_OFFSET_DATA, bo);
272 DEBUG_1(" tag %x format %x count %x data_val %x", tag, format, count, data_val);
277 mpe->MPFVersion = data_val;
278 DEBUG_1(" mpo version %x", data_val);
281 mpe->MPIndividualNum = data_val;
282 DEBUG_1(" Individual Image Number %x", mpe->MPIndividualNum);
285 mpe->PanOrientation = data_val;
290 Panorama Scanning Orientation PanOrientation 45569 B201 LONG 1
291 Panorama Horizontal Overlap PanOverlap_H 45570 B202 RATIONAL 1
292 Panorama Vertical Overlap PanOverlap_V 45571 B203 RATIONAL 1
293 Base Viewpoint Number BaseViewpointNum 45572 B204 LONG 1
294 Convergence Angle ConvergenceAngle 45573 B205 SRATIONAL 1
295 Baseline Length BaselineLength 45574 B206 RATIONAL 1
296 Divergence Angle VerticalDivergence 45575 B207 SRATIONAL 1
297 Horizontal Axis Distance AxisDistance_X 45576 B208 SRATIONAL 1
298 Vertical Axis Distance AxisDistance_Y 45577 B209 SRATIONAL 1
299 Collimation Axis Distance AxisDistance_Z 45578 B20A SRATIONAL 1
300 Yaw Angle YawAngle 45579 B20B SRATIONAL 1
301 Pitch Angle PitchAngle 45580 B20C SRATIONAL 1
302 Roll Angle RollAngle 45581 B20D
311 MPOData *jpeg_get_mpo_data(const guchar *data, guint size)
315 if (jpeg_segment_find(data, size, JPEG_MARKER_APP2, "MPF\x00", 4, &seg_offset, &seg_size) && seg_size >16)
323 DEBUG_1("mpo signature found at %x", seg_offset);
327 if (!tiff_directory_offset(data + seg_offset, seg_size, &offset, &bo)) return NULL;
329 mpo = g_new0(MPOData, 1);
330 mpo->mpo_offset = seg_offset;
332 tiff_parse_IFD_table(data + seg_offset, offset , seg_size, bo, &next_offset, mpo_parse_Index_IFD_entry, (gpointer)mpo);
333 if (!mpo->images) mpo->num_images = 0;
336 for (i = 0; i < mpo->num_images; i++)
338 if (mpo->images[i].offset + mpo->images[i].length > size)
341 DEBUG_1("MPO file truncated to %d valid images, %d %d", i, mpo->images[i].offset + mpo->images[i].length, size);
346 for (i = 0; i < mpo->num_images; i++)
350 offset = next_offset;
354 if (!jpeg_segment_find(data + mpo->images[i].offset, mpo->images[i].length, JPEG_MARKER_APP2, "MPF\x00", 4, &seg_offset, &seg_size) || seg_size <=16)
356 DEBUG_1("MPO image %d: MPO signature not found", i);
362 if (!tiff_directory_offset(data + mpo->images[i].offset + seg_offset, seg_size, &offset, &bo))
364 DEBUG_1("MPO image %d: invalid directory offset", i);
369 tiff_parse_IFD_table(data + mpo->images[i].offset + seg_offset, offset , seg_size, bo, NULL, mpo_parse_Attributes_IFD_entry, (gpointer)&mpo->images[i]);
377 void jpeg_mpo_data_free(MPOData *mpo)
381 if (mpo->images) g_free(mpo->images);
387 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */