+/*
+ * Geeqie
+ * (C) 2004 John Ellis
+ * Copyright (C) 2008 - 2011 The Geeqie Team
+ *
+ * Author: Vladimir Nadvornik
+ *
+ * This software is released under the GNU General Public License (GNU GPL).
+ * Please read the included file COPYING for more information.
+ * This software comes with no warranty of any kind, use at your own risk!
+ */
-#include "main.h"
+#include "main.h"
#include "jpeg_parser.h"
-gboolean jpeg_segment_find(guchar *data, guint size,
+gboolean jpeg_segment_find(const guchar *data, guint size,
guchar app_marker, const gchar *magic, guint magic_len,
guint *seg_offset, guint *seg_length)
{
guint offset = 0;
guint length = 0;
- while (marker != app_marker &&
- marker != JPEG_MARKER_EOI)
+ while (marker != JPEG_MARKER_EOI)
{
offset += length;
length = 2;
{
if (offset + 4 >= size) return FALSE;
length += ((guint)data[offset + 2] << 8) + data[offset + 3];
+
+ if (marker == app_marker &&
+ offset + length < size &&
+ length >= 4 + magic_len &&
+ memcmp(data + offset + 4, magic, magic_len) == 0)
+ {
+ *seg_offset = offset + 4;
+ *seg_length = length - 4;
+ return TRUE;
+ }
}
}
+ return FALSE;
+}
+
+
+typedef enum {
+ TIFF_BYTE_ORDER_INTEL,
+ TIFF_BYTE_ORDER_MOTOROLA
+} TiffByteOrder;
+
+#define TIFF_TIFD_OFFSET_TAG 0
+#define TIFF_TIFD_OFFSET_FORMAT 2
+#define TIFF_TIFD_OFFSET_COUNT 4
+#define TIFF_TIFD_OFFSET_DATA 8
+#define TIFF_TIFD_SIZE 12
+
- if (marker == app_marker &&
- offset + length < size &&
- length >= 4 + magic_len &&
- memcmp(data + offset + 4, magic, magic_len) == 0)
+
+guint16 tiff_byte_get_int16(const guchar *f, TiffByteOrder bo)
+{
+ guint16 align_buf;
+
+ memcpy(&align_buf, f, sizeof(guint16));
+
+ if (bo == TIFF_BYTE_ORDER_INTEL)
+ return GUINT16_FROM_LE(align_buf);
+ else
+ return GUINT16_FROM_BE(align_buf);
+}
+
+guint32 tiff_byte_get_int32(const guchar *f, TiffByteOrder bo)
+{
+ guint32 align_buf;
+
+ memcpy(&align_buf, f, sizeof(guint32));
+
+ if (bo == TIFF_BYTE_ORDER_INTEL)
+ return GUINT32_FROM_LE(align_buf);
+ else
+ return GUINT32_FROM_BE(align_buf);
+}
+
+void tiff_byte_put_int16(guchar *f, guint16 n, TiffByteOrder bo)
+{
+ guint16 align_buf;
+
+ if (bo == TIFF_BYTE_ORDER_INTEL)
{
- *seg_offset = offset + 4;
- *seg_length = length - 4;
- return TRUE;
+ align_buf = GUINT16_TO_LE(n);
+ }
+ else
+ {
+ align_buf = GUINT16_TO_BE(n);
}
- return FALSE;
+ memcpy(f, &align_buf, sizeof(guint16));
}
+
+void tiff_byte_put_int32(guchar *f, guint32 n, TiffByteOrder bo)
+{
+ guint32 align_buf;
+
+ if (bo == TIFF_BYTE_ORDER_INTEL)
+ {
+ align_buf = GUINT32_TO_LE(n);
+ }
+ else
+ {
+ align_buf = GUINT32_TO_BE(n);
+ }
+
+ memcpy(f, &align_buf, sizeof(guint32));
+}
+
+gint tiff_directory_offset(const guchar *data, const guint len,
+ guint *offset, TiffByteOrder *bo)
+{
+ if (len < 8) return FALSE;
+
+ if (memcmp(data, "II", 2) == 0)
+ {
+ *bo = TIFF_BYTE_ORDER_INTEL;
+ }
+ else if (memcmp(data, "MM", 2) == 0)
+ {
+ *bo = TIFF_BYTE_ORDER_MOTOROLA;
+ }
+ else
+ {
+ return FALSE;
+ }
+
+ if (tiff_byte_get_int16(data + 2, *bo) != 0x002A)
+ {
+ return FALSE;
+ }
+
+ *offset = tiff_byte_get_int32(data + 4, *bo);
+
+ return (*offset < len);
+}
+
+typedef gint (* FuncParseIFDEntry)(const guchar *tiff, guint offset,
+ guint size, TiffByteOrder bo,
+ gpointer data);
+
+
+gint tiff_parse_IFD_table(const guchar *tiff, guint offset,
+ guint size, TiffByteOrder bo,
+ guint *next_offset,
+ FuncParseIFDEntry parse_entry, gpointer data)
+{
+ guint count;
+ guint i;
+ guint next;
+
+
+ /* We should be able to read number of entries in IFD0) */
+ if (size < offset + 2) return -1;
+
+ count = tiff_byte_get_int16(tiff + offset, bo);
+ offset += 2;
+ /* Entries and next IFD offset must be readable */
+ if (size < offset + count * TIFF_TIFD_SIZE + 4) return -1;
+
+ for (i = 0; i < count; i++)
+ {
+ parse_entry(tiff, offset + i * TIFF_TIFD_SIZE, size, bo, data);
+ }
+
+ next = tiff_byte_get_int32(tiff + offset + count * TIFF_TIFD_SIZE, bo);
+ if (next_offset) *next_offset = next;
+
+ return 0;
+}
+
+static gint mpo_parse_Index_IFD_entry(const guchar *tiff, guint offset,
+ guint size, TiffByteOrder bo,
+ gpointer data)
+{
+ guint tag;
+ guint format;
+ guint count;
+ guint data_val;
+ guint data_offset;
+ guint data_length;
+
+ MPOData *mpo = data;
+
+ tag = tiff_byte_get_int16(tiff + offset + TIFF_TIFD_OFFSET_TAG, bo);
+ format = tiff_byte_get_int16(tiff + offset + TIFF_TIFD_OFFSET_FORMAT, bo);
+ count = tiff_byte_get_int32(tiff + offset + TIFF_TIFD_OFFSET_COUNT, bo);
+ data_val = tiff_byte_get_int32(tiff + offset + TIFF_TIFD_OFFSET_DATA, bo);
+ DEBUG_1(" tag %x format %x count %x data_val %x", tag, format, count, data_val);
+
+ if (tag == 0xb000)
+ {
+ mpo->version = data_val;
+ DEBUG_1(" mpo version %x", mpo->version);
+ }
+ else if (tag == 0xb001)
+ {
+ mpo->num_images = data_val;
+ DEBUG_1(" num images %x", mpo->num_images);
+ }
+ else if (tag == 0xb002)
+ {
+ guint i;
+ data_offset = data_val;
+ data_length = count;
+ if (size < data_offset || size < data_offset + data_length)
+ {
+ return -1;
+ }
+ if (count != mpo->num_images * 16)
+ {
+ return -1;
+ }
+
+ mpo->images = g_new0(MPOEntry, mpo->num_images);
+
+ for (i = 0; i < mpo->num_images; i++) {
+ guint image_attr = tiff_byte_get_int32(tiff + data_offset + i * 16, bo);
+ mpo->images[i].type_code = image_attr & 0xffffff;
+ mpo->images[i].representative = !!(image_attr & 0x20000000);
+ mpo->images[i].dependent_child = !!(image_attr & 0x40000000);
+ mpo->images[i].dependent_parent = !!(image_attr & 0x80000000);
+ mpo->images[i].length = tiff_byte_get_int32(tiff + data_offset + i * 16 + 4, bo);
+ mpo->images[i].offset = tiff_byte_get_int32(tiff + data_offset + i * 16 + 8, bo);
+ mpo->images[i].dep1 = tiff_byte_get_int16(tiff + data_offset + i * 16 + 12, bo);
+ mpo->images[i].dep2 = tiff_byte_get_int16(tiff + data_offset + i * 16 + 14, bo);
+
+ if (i == 0)
+ {
+ mpo->images[i].offset = 0;
+ }
+ else
+ {
+ mpo->images[i].offset += mpo->mpo_offset;
+ }
+
+ DEBUG_1(" image %x %x %x", image_attr, mpo->images[i].length, mpo->images[i].offset);
+ }
+ }
+
+ return 0;
+}
+
+static gint mpo_parse_Attributes_IFD_entry(const guchar *tiff, guint offset,
+ guint size, TiffByteOrder bo,
+ gpointer data)
+{
+ guint tag;
+ guint format;
+ guint count;
+ guint data_val;
+
+ MPOEntry *mpe = data;
+
+ tag = tiff_byte_get_int16(tiff + offset + TIFF_TIFD_OFFSET_TAG, bo);
+ format = tiff_byte_get_int16(tiff + offset + TIFF_TIFD_OFFSET_FORMAT, bo);
+ count = tiff_byte_get_int32(tiff + offset + TIFF_TIFD_OFFSET_COUNT, bo);
+ data_val = tiff_byte_get_int32(tiff + offset + TIFF_TIFD_OFFSET_DATA, bo);
+ DEBUG_1(" tag %x format %x count %x data_val %x", tag, format, count, data_val);
+
+ switch (tag)
+ {
+ case 0xb000:
+ mpe->MPFVersion = data_val;
+ DEBUG_1(" mpo version %x", data_val);
+ break;
+ case 0xb101:
+ mpe->MPIndividualNum = data_val;
+ DEBUG_1(" Individual Image Number %x", mpe->MPIndividualNum);
+ break;
+ case 0xb201:
+ mpe->PanOrientation = data_val;
+ break;
+/*
+
+FIXME:
+Panorama Scanning Orientation PanOrientation 45569 B201 LONG 1
+Panorama Horizontal Overlap PanOverlap_H 45570 B202 RATIONAL 1
+Panorama Vertical Overlap PanOverlap_V 45571 B203 RATIONAL 1
+Base Viewpoint Number BaseViewpointNum 45572 B204 LONG 1
+Convergence Angle ConvergenceAngle 45573 B205 SRATIONAL 1
+Baseline Length BaselineLength 45574 B206 RATIONAL 1
+Divergence Angle VerticalDivergence 45575 B207 SRATIONAL 1
+Horizontal Axis Distance AxisDistance_X 45576 B208 SRATIONAL 1
+Vertical Axis Distance AxisDistance_Y 45577 B209 SRATIONAL 1
+Collimation Axis Distance AxisDistance_Z 45578 B20A SRATIONAL 1
+Yaw Angle YawAngle 45579 B20B SRATIONAL 1
+Pitch Angle PitchAngle 45580 B20C SRATIONAL 1
+Roll Angle RollAngle 45581 B20D
+ */
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+MPOData *jpeg_get_mpo_data(const guchar *data, guint size)
+{
+ guint seg_offset;
+ guint seg_size;
+ if (jpeg_segment_find(data, size, JPEG_MARKER_APP2, "MPF\x00", 4, &seg_offset, &seg_size) && seg_size >16)
+ {
+ guint offset;
+ guint next_offset;
+ TiffByteOrder bo;
+ MPOData *mpo;
+ guint i;
+
+ DEBUG_1("mpo signature found at %x", seg_offset);
+ seg_offset += 4;
+ seg_size -= 4;
+
+ if (!tiff_directory_offset(data + seg_offset, seg_size, &offset, &bo)) return NULL;
+
+ mpo = g_new0(MPOData, 1);
+ mpo->mpo_offset = seg_offset;
+
+ tiff_parse_IFD_table(data + seg_offset, offset , seg_size, bo, &next_offset, mpo_parse_Index_IFD_entry, (gpointer)mpo);
+ if (!mpo->images) mpo->num_images = 0;
+
+
+ for (i = 0; i < mpo->num_images; i++)
+ {
+ if (mpo->images[i].offset + mpo->images[i].length > size)
+ {
+ mpo->num_images = i;
+ DEBUG_1("MPO file truncated to %d valid images, %d %d", i, mpo->images[i].offset + mpo->images[i].length, size);
+ break;
+ }
+ }
+
+ for (i = 0; i < mpo->num_images; i++)
+ {
+ if (i == 0)
+ {
+ offset = next_offset;
+ }
+ else
+ {
+ 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)
+ {
+ DEBUG_1("MPO image %d: MPO signature not found", i);
+ continue;
+ }
+
+ seg_offset += 4;
+ seg_size -= 4;
+ if (!tiff_directory_offset(data + mpo->images[i].offset + seg_offset, seg_size, &offset, &bo))
+ {
+ DEBUG_1("MPO image %d: invalid directory offset", i);
+ continue;
+ }
+
+ }
+ 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]);
+ }
+
+ return mpo;
+ }
+ return NULL;
+}
+
+void jpeg_mpo_data_free(MPOData *mpo)
+{
+ if (mpo)
+ {
+ if (mpo->images) g_free(mpo->images);
+ g_free(mpo);
+ }
+}
+
+
+/* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */
projects / geeqie.git / blobdiff