+++ /dev/null
-
-#include "main.h"
-#include "jpeg_parser.h"
-
-gboolean jpeg_segment_find(guchar *data, guint size,
- guchar app_marker, const gchar *magic, guint magic_len,
- guint *seg_offset, guint *seg_length)
-{
- guchar marker = 0;
- guint offset = 0;
- guint length = 0;
-
- while (marker != app_marker &&
- marker != JPEG_MARKER_EOI)
- {
- offset += length;
- length = 2;
-
- if (offset + 2 >= size ||
- data[offset] != JPEG_MARKER) return FALSE;
-
- marker = data[offset + 1];
- if (marker != JPEG_MARKER_SOI &&
- marker != JPEG_MARKER_EOI)
- {
- 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
-
-
-
-guint16 tiff_byte_get_int16(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(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)
- {
- align_buf = GUINT16_TO_LE(n);
- }
- else
- {
- align_buf = GUINT16_TO_BE(n);
- }
-
- 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(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)(guchar *tiff, guint offset,
- guint size, TiffByteOrder bo,
- gpointer data);
-
-
-gint tiff_parse_IFD_table(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;
-printf("count %d\n", count);
- /* 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);
-printf("next %d\n", next);
- if (next_offset) *next_offset = next;
-
- return 0;
-}
-
-static gint mpo_parse_Index_IFD_entry(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);
-printf("tag %x format %x count %x data_val %x\n", tag, format, count, data_val);
-
- if (tag == 0xb000)
- {
- mpo->version = data_val;
- }
- else if (tag == 0xb001)
- {
- mpo->num_images = data_val;
- }
- 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;
- }
-
- printf("img %x %x %x\n", image_attr, mpo->images[i].length, mpo->images[i].offset);
- }
- }
-
- return 0;
-}
-
-MPOData *jpeg_get_mpo_data(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;
- TiffByteOrder bo;
- MPOData *mpo;
- guint i;
-
- printf("mpo signature found at %x\n", seg_offset);
- data += seg_offset + 4;
- seg_size -= 4;
-
- if (!tiff_directory_offset(data, seg_size, &offset, &bo)) return NULL;
-
- mpo = g_new0(MPOData, 1);
- mpo->mpo_offset = seg_offset + 4;
-
- tiff_parse_IFD_table(data, offset , seg_size, bo, NULL, 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", i);
- break;
- }
- }
- return mpo;
- }
- return NULL;
-}
projects / geeqie.git / blobdiff