2a2773ea29
Change-Id: I5e069d6ea4da9d8c71be03ef99aad679dd1aad21
211 lines
6.1 KiB
C
211 lines
6.1 KiB
C
// Copyright 2012 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// TIFF decode.
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#include "./tiffdec.h"
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#ifdef HAVE_CONFIG_H
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#include "webp/config.h"
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#endif
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#include <stdio.h>
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#include <string.h>
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#ifdef WEBP_HAVE_TIFF
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#include <tiffio.h>
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#include "webp/encode.h"
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#include "./imageio_util.h"
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#include "./metadata.h"
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static const struct {
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ttag_t tag;
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size_t storage_offset;
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} kTIFFMetadataMap[] = {
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{ TIFFTAG_ICCPROFILE, METADATA_OFFSET(iccp) },
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{ TIFFTAG_XMLPACKET, METADATA_OFFSET(xmp) },
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{ 0, 0 },
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};
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// Returns true on success. The caller must use MetadataFree() on 'metadata' in
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// all cases.
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static int ExtractMetadataFromTIFF(TIFF* const tif, Metadata* const metadata) {
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int i;
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toff_t exif_ifd_offset;
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for (i = 0; kTIFFMetadataMap[i].tag != 0; ++i) {
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MetadataPayload* const payload =
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(MetadataPayload*)((uint8_t*)metadata +
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kTIFFMetadataMap[i].storage_offset);
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void* tag_data;
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uint32 tag_data_len;
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if (TIFFGetField(tif, kTIFFMetadataMap[i].tag, &tag_data_len, &tag_data) &&
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!MetadataCopy((const char*)tag_data, tag_data_len, payload)) {
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return 0;
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}
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}
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// TODO(jzern): To extract the raw EXIF directory some parsing of it would be
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// necessary to determine the overall size. In addition, value offsets in
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// individual directory entries may need to be updated as, depending on the
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// type, they are file based.
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// Exif 2.2 Section 4.6.2 Tag Structure
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// TIFF Revision 6.0 Part 1 Section 2 TIFF Structure #Image File Directory
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if (TIFFGetField(tif, TIFFTAG_EXIFIFD, &exif_ifd_offset)) {
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fprintf(stderr, "Warning: EXIF extraction from TIFF is unsupported.\n");
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}
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return 1;
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}
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// Ad-hoc structure to supply read-from-memory functionalities.
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typedef struct {
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const uint8_t* data;
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toff_t size;
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toff_t pos;
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} MyData;
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static int MyClose(thandle_t opaque) {
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(void)opaque;
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return 0;
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}
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static toff_t MySize(thandle_t opaque) {
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const MyData* const my_data = (MyData*)opaque;
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return my_data->size;
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}
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static toff_t MySeek(thandle_t opaque, toff_t offset, int whence) {
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MyData* const my_data = (MyData*)opaque;
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offset += (whence == SEEK_CUR) ? my_data->pos
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: (whence == SEEK_SET) ? 0
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: my_data->size;
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if (offset > my_data->size) return (toff_t)-1;
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my_data->pos = offset;
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return offset;
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}
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static int MyMapFile(thandle_t opaque, void** base, toff_t* size) {
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(void)opaque;
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(void)base;
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(void)size;
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return 0;
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}
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static void MyUnmapFile(thandle_t opaque, void* base, toff_t size) {
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(void)opaque;
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(void)base;
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(void)size;
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}
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static tsize_t MyRead(thandle_t opaque, void* dst, tsize_t size) {
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MyData* const my_data = (MyData*)opaque;
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if (my_data->pos + size > my_data->size) {
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size = my_data->size - my_data->pos;
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}
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if (size > 0) {
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memcpy(dst, my_data->data + my_data->pos, size);
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my_data->pos += size;
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}
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return size;
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}
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int ReadTIFF(const uint8_t* const data, size_t data_size,
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WebPPicture* const pic, int keep_alpha,
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Metadata* const metadata) {
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MyData my_data = { data, (toff_t)data_size, 0 };
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TIFF* tif;
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uint32 width, height;
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uint32* raster;
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int64_t alloc_size;
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int ok = 0;
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tdir_t dircount;
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if (data == NULL || data_size == 0 || pic == NULL) return 0;
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tif = TIFFClientOpen("Memory", "r", &my_data,
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MyRead, MyRead, MySeek, MyClose,
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MySize, MyMapFile, MyUnmapFile);
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if (tif == NULL) {
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fprintf(stderr, "Error! Cannot parse TIFF file\n");
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return 0;
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}
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dircount = TIFFNumberOfDirectories(tif);
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if (dircount > 1) {
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fprintf(stderr, "Warning: multi-directory TIFF files are not supported.\n"
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"Only the first will be used, %d will be ignored.\n",
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dircount - 1);
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}
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if (!(TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &width) &&
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TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &height))) {
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fprintf(stderr, "Error! Cannot retrieve TIFF image dimensions.\n");
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goto End;
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}
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if (!ImgIoUtilCheckSizeArgumentsOverflow((uint64_t)width * height,
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sizeof(*raster))) {
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goto End;
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}
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// _Tiffmalloc uses a signed type for size.
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alloc_size = (int64_t)((uint64_t)width * height * sizeof(*raster));
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if (alloc_size < 0 || alloc_size != (tmsize_t)alloc_size) goto End;
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raster = (uint32*)_TIFFmalloc((tmsize_t)alloc_size);
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if (raster != NULL) {
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if (TIFFReadRGBAImageOriented(tif, width, height, raster,
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ORIENTATION_TOPLEFT, 1)) {
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const int stride = width * sizeof(*raster);
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pic->width = width;
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pic->height = height;
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// TIFF data is ABGR
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#ifdef WORDS_BIGENDIAN
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TIFFSwabArrayOfLong(raster, width * height);
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#endif
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ok = keep_alpha
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? WebPPictureImportRGBA(pic, (const uint8_t*)raster, stride)
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: WebPPictureImportRGBX(pic, (const uint8_t*)raster, stride);
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}
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_TIFFfree(raster);
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} else {
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fprintf(stderr, "Error allocating TIFF RGBA memory!\n");
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}
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if (ok) {
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if (metadata != NULL) {
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ok = ExtractMetadataFromTIFF(tif, metadata);
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if (!ok) {
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fprintf(stderr, "Error extracting TIFF metadata!\n");
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MetadataFree(metadata);
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WebPPictureFree(pic);
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}
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}
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}
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End:
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TIFFClose(tif);
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return ok;
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}
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#else // !WEBP_HAVE_TIFF
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int ReadTIFF(const uint8_t* const data, size_t data_size,
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struct WebPPicture* const pic, int keep_alpha,
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struct Metadata* const metadata) {
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(void)data;
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(void)data_size;
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(void)pic;
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(void)keep_alpha;
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(void)metadata;
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fprintf(stderr, "TIFF support not compiled. Please install the libtiff "
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"development package before building.\n");
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return 0;
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}
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#endif // WEBP_HAVE_TIFF
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// -----------------------------------------------------------------------------
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