src/third_party/libwebp/imageio/tiffdec.c - cobalt - Git at Google

 // Copyright 2012 Google Inc. All Rights Reserved.
 //
 // Use of this source code is governed by a BSD-style license
 // that can be found in the COPYING file in the root of the source
 // tree. An additional intellectual property rights grant can be found
 // in the file PATENTS. All contributing project authors may
 // be found in the AUTHORS file in the root of the source tree.
 // -----------------------------------------------------------------------------
 //
 // TIFF decode.

 #include "./tiffdec.h"

 #ifdef HAVE_CONFIG_H
 #include "webp/config.h"
 #endif

 #include <limits.h>
 #include <stdio.h>
 #include <string.h>

 #ifdef WEBP_HAVE_TIFF
 #include <tiffio.h>

 #include "webp/encode.h"
 #include "./imageio_util.h"
 #include "./metadata.h"

 static const struct {
   ttag_t tag;
   size_t storage_offset;
 } kTIFFMetadataMap[] = {
   { TIFFTAG_ICCPROFILE, METADATA_OFFSET(iccp) },
   { TIFFTAG_XMLPACKET,  METADATA_OFFSET(xmp) },
   { 0, 0 },
 };

 // Returns true on success. The caller must use MetadataFree() on 'metadata' in
 // all cases.
 static int ExtractMetadataFromTIFF(TIFF* const tif, Metadata* const metadata) {
   int i;
   toff_t exif_ifd_offset;

   for (i = 0; kTIFFMetadataMap[i].tag != 0; ++i) {
     MetadataPayload* const payload =
         (MetadataPayload*)((uint8_t*)metadata +
                            kTIFFMetadataMap[i].storage_offset);
     void* tag_data;
     uint32 tag_data_len;

     if (TIFFGetField(tif, kTIFFMetadataMap[i].tag, &tag_data_len, &tag_data) &&
         !MetadataCopy((const char*)tag_data, tag_data_len, payload)) {
       return 0;
     }
   }

   // TODO(jzern): To extract the raw EXIF directory some parsing of it would be
   // necessary to determine the overall size. In addition, value offsets in
   // individual directory entries may need to be updated as, depending on the
   // type, they are file based.
   // Exif 2.2 Section 4.6.2 Tag Structure
   // TIFF Revision 6.0 Part 1 Section 2 TIFF Structure #Image File Directory
   if (TIFFGetField(tif, TIFFTAG_EXIFIFD, &exif_ifd_offset)) {
     fprintf(stderr, "Warning: EXIF extraction from TIFF is unsupported.\n");
   }
   return 1;
 }

 // Ad-hoc structure to supply read-from-memory functionalities.
 typedef struct {
   const uint8_t* data;
   toff_t size;
   toff_t pos;
 } MyData;

 static int MyClose(thandle_t opaque) {
   (void)opaque;
   return 0;
 }

 static toff_t MySize(thandle_t opaque) {
   const MyData* const my_data = (MyData*)opaque;
   return my_data->size;
 }

 static toff_t MySeek(thandle_t opaque, toff_t offset, int whence) {
   MyData* const my_data = (MyData*)opaque;
   offset += (whence == SEEK_CUR) ? my_data->pos
           : (whence == SEEK_SET) ? 0
           : my_data->size;
   if (offset > my_data->size) return (toff_t)-1;
   my_data->pos = offset;
   return offset;
 }

 static int MyMapFile(thandle_t opaque, void** base, toff_t* size) {
   (void)opaque;
   (void)base;
   (void)size;
   return 0;
 }
 static void MyUnmapFile(thandle_t opaque, void* base, toff_t size) {
   (void)opaque;
   (void)base;
   (void)size;
 }

 static tsize_t MyRead(thandle_t opaque, void* dst, tsize_t size) {
   MyData* const my_data = (MyData*)opaque;
   if (my_data->pos + size > my_data->size) {
     size = (tsize_t)(my_data->size - my_data->pos);
   }
   if (size > 0) {
     memcpy(dst, my_data->data + my_data->pos, size);
     my_data->pos += size;
   }
   return size;
 }

 // Unmultiply Argb data. Taken from dsp/alpha_processing
 // (we don't want to force a dependency to a libdspdec library).
 #define MFIX 24    // 24bit fixed-point arithmetic
 #define HALF ((1u << MFIX) >> 1)
 #define KINV_255 ((1u << MFIX) / 255u)

 static uint32_t Unmult(uint8_t x, uint32_t mult) {
   const uint32_t v = (x * mult + HALF) >> MFIX;
   return (v > 255u) ? 255u : v;
 }

 static WEBP_INLINE uint32_t GetScale(uint32_t a) {
   return (255u << MFIX) / a;
 }

 static void MultARGBRow(uint8_t* ptr, int width) {
   int x;
   for (x = 0; x < width; ++x, ptr += 4) {
     const uint32_t alpha = ptr[3];
     if (alpha < 255) {
       if (alpha == 0) {   // alpha == 0
         ptr[0] = ptr[1] = ptr[2] = 0;
       } else {
         const uint32_t scale = GetScale(alpha);
         ptr[0] = Unmult(ptr[0], scale);
         ptr[1] = Unmult(ptr[1], scale);
         ptr[2] = Unmult(ptr[2], scale);
       }
     }
   }
 }

 int ReadTIFF(const uint8_t* const data, size_t data_size,
              WebPPicture* const pic, int keep_alpha,
              Metadata* const metadata) {
   MyData my_data = { data, (toff_t)data_size, 0 };
   TIFF* tif;
   uint32_t width, height;
   uint16_t samples_per_px = 0;
   uint16_t extra_samples = 0;
   uint16_t* extra_samples_ptr = NULL;
   uint32_t* raster;
   int64_t alloc_size;
   int ok = 0;
   tdir_t dircount;

   if (data == NULL || data_size == 0 || data_size > INT_MAX || pic == NULL) {
     return 0;
   }

   tif = TIFFClientOpen("Memory", "r", &my_data,
                        MyRead, MyRead, MySeek, MyClose,
                        MySize, MyMapFile, MyUnmapFile);
   if (tif == NULL) {
     fprintf(stderr, "Error! Cannot parse TIFF file\n");
     return 0;
   }

   dircount = TIFFNumberOfDirectories(tif);
   if (dircount > 1) {
     fprintf(stderr, "Warning: multi-directory TIFF files are not supported.\n"
                     "Only the first will be used, %d will be ignored.\n",
                     dircount - 1);
   }
   if (!TIFFGetFieldDefaulted(tif, TIFFTAG_SAMPLESPERPIXEL, &samples_per_px)) {
     fprintf(stderr, "Error! Cannot retrieve TIFF samples-per-pixel info.\n");
     goto End;
   }
   if (samples_per_px < 3 || samples_per_px > 4) goto End;  // not supported

   if (!(TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &width) &&
         TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &height))) {
     fprintf(stderr, "Error! Cannot retrieve TIFF image dimensions.\n");
     goto End;
   }
   if (!ImgIoUtilCheckSizeArgumentsOverflow((uint64_t)width * height,
                                            sizeof(*raster))) {
     goto End;
   }
   if (samples_per_px > 3 && !TIFFGetField(tif, TIFFTAG_EXTRASAMPLES,
                                           &extra_samples, &extra_samples_ptr)) {
     fprintf(stderr, "Error! Cannot retrieve TIFF ExtraSamples info.\n");
     goto End;
   }

   // _Tiffmalloc uses a signed type for size.
   alloc_size = (int64_t)((uint64_t)width * height * sizeof(*raster));
   if (alloc_size < 0 || alloc_size != (tsize_t)alloc_size) goto End;

   raster = (uint32*)_TIFFmalloc((tsize_t)alloc_size);
   if (raster != NULL) {
     if (TIFFReadRGBAImageOriented(tif, width, height, raster,
                                   ORIENTATION_TOPLEFT, 1)) {
       const int stride = width * sizeof(*raster);
       pic->width = width;
       pic->height = height;
       // TIFF data is ABGR
 #ifdef WORDS_BIGENDIAN
       TIFFSwabArrayOfLong(raster, width * height);
 #endif
       // if we have an alpha channel, we must un-multiply from rgbA to RGBA
       if (extra_samples == 1 && extra_samples_ptr != NULL &&
           extra_samples_ptr[0] == EXTRASAMPLE_ASSOCALPHA) {
         uint32_t y;
         uint8_t* tmp = (uint8_t*)raster;
         for (y = 0; y < height; ++y) {
           MultARGBRow(tmp, width);
           tmp += stride;
         }
       }
       ok = keep_alpha
          ? WebPPictureImportRGBA(pic, (const uint8_t*)raster, stride)
          : WebPPictureImportRGBX(pic, (const uint8_t*)raster, stride);
     }
     _TIFFfree(raster);
   } else {
     fprintf(stderr, "Error allocating TIFF RGBA memory!\n");
   }

   if (ok) {
     if (metadata != NULL) {
       ok = ExtractMetadataFromTIFF(tif, metadata);
       if (!ok) {
         fprintf(stderr, "Error extracting TIFF metadata!\n");
         MetadataFree(metadata);
         WebPPictureFree(pic);
       }
     }
   }
  End:
   TIFFClose(tif);
   return ok;
 }
 #else  // !WEBP_HAVE_TIFF
 int ReadTIFF(const uint8_t* const data, size_t data_size,
              struct WebPPicture* const pic, int keep_alpha,
              struct Metadata* const metadata) {
   (void)data;
   (void)data_size;
   (void)pic;
   (void)keep_alpha;
   (void)metadata;
   fprintf(stderr, "TIFF support not compiled. Please install the libtiff "
           "development package before building.\n");
   return 0;
 }
 #endif  // WEBP_HAVE_TIFF

 // -----------------------------------------------------------------------------
	// Copyright 2012 Google Inc. All Rights Reserved.
	//
	// Use of this source code is governed by a BSD-style license
	// that can be found in the COPYING file in the root of the source
	// tree. An additional intellectual property rights grant can be found
	// in the file PATENTS. All contributing project authors may
	// be found in the AUTHORS file in the root of the source tree.
	// -----------------------------------------------------------------------------
	//
	// TIFF decode.

	#include "./tiffdec.h"

	#ifdef HAVE_CONFIG_H
	#include "webp/config.h"
	#endif

	#include <limits.h>
	#include <stdio.h>
	#include <string.h>

	#ifdef WEBP_HAVE_TIFF
	#include <tiffio.h>

	#include "webp/encode.h"
	#include "./imageio_util.h"
	#include "./metadata.h"

	static const struct {
	ttag_t tag;
	size_t storage_offset;
	} kTIFFMetadataMap[] = {
	{ TIFFTAG_ICCPROFILE, METADATA_OFFSET(iccp) },
	{ TIFFTAG_XMLPACKET, METADATA_OFFSET(xmp) },
	{ 0, 0 },
	};

	// Returns true on success. The caller must use MetadataFree() on 'metadata' in
	// all cases.
	static int ExtractMetadataFromTIFF(TIFF* const tif, Metadata* const metadata) {
	int i;
	toff_t exif_ifd_offset;

	for (i = 0; kTIFFMetadataMap[i].tag != 0; ++i) {
	MetadataPayload* const payload =
	(MetadataPayload)((uint8_t)metadata +
	kTIFFMetadataMap[i].storage_offset);
	void* tag_data;
	uint32 tag_data_len;

	if (TIFFGetField(tif, kTIFFMetadataMap[i].tag, &tag_data_len, &tag_data) &&
	!MetadataCopy((const char*)tag_data, tag_data_len, payload)) {
	return 0;
	}
	}

	// TODO(jzern): To extract the raw EXIF directory some parsing of it would be
	// necessary to determine the overall size. In addition, value offsets in
	// individual directory entries may need to be updated as, depending on the
	// type, they are file based.
	// Exif 2.2 Section 4.6.2 Tag Structure
	// TIFF Revision 6.0 Part 1 Section 2 TIFF Structure #Image File Directory
	if (TIFFGetField(tif, TIFFTAG_EXIFIFD, &exif_ifd_offset)) {
	fprintf(stderr, "Warning: EXIF extraction from TIFF is unsupported.\n");
	}
	return 1;
	}

	// Ad-hoc structure to supply read-from-memory functionalities.
	typedef struct {
	const uint8_t* data;
	toff_t size;
	toff_t pos;
	} MyData;

	static int MyClose(thandle_t opaque) {
	(void)opaque;
	return 0;
	}

	static toff_t MySize(thandle_t opaque) {
	const MyData* const my_data = (MyData*)opaque;
	return my_data->size;
	}

	static toff_t MySeek(thandle_t opaque, toff_t offset, int whence) {
	MyData* const my_data = (MyData*)opaque;
	offset += (whence == SEEK_CUR) ? my_data->pos
	: (whence == SEEK_SET) ? 0
	: my_data->size;
	if (offset > my_data->size) return (toff_t)-1;
	my_data->pos = offset;
	return offset;
	}

	static int MyMapFile(thandle_t opaque, void** base, toff_t* size) {
	(void)opaque;
	(void)base;
	(void)size;
	return 0;
	}
	static void MyUnmapFile(thandle_t opaque, void* base, toff_t size) {
	(void)opaque;
	(void)base;
	(void)size;
	}

	static tsize_t MyRead(thandle_t opaque, void* dst, tsize_t size) {
	MyData* const my_data = (MyData*)opaque;
	if (my_data->pos + size > my_data->size) {
	size = (tsize_t)(my_data->size - my_data->pos);
	}
	if (size > 0) {
	memcpy(dst, my_data->data + my_data->pos, size);
	my_data->pos += size;
	}
	return size;
	}

	// Unmultiply Argb data. Taken from dsp/alpha_processing
	// (we don't want to force a dependency to a libdspdec library).
	#define MFIX 24 // 24bit fixed-point arithmetic
	#define HALF ((1u << MFIX) >> 1)
	#define KINV_255 ((1u << MFIX) / 255u)

	static uint32_t Unmult(uint8_t x, uint32_t mult) {
	const uint32_t v = (x * mult + HALF) >> MFIX;
	return (v > 255u) ? 255u : v;
	}

	static WEBP_INLINE uint32_t GetScale(uint32_t a) {
	return (255u << MFIX) / a;
	}

	static void MultARGBRow(uint8_t* ptr, int width) {
	int x;
	for (x = 0; x < width; ++x, ptr += 4) {
	const uint32_t alpha = ptr[3];
	if (alpha < 255) {
	if (alpha == 0) { // alpha == 0
	ptr[0] = ptr[1] = ptr[2] = 0;
	} else {
	const uint32_t scale = GetScale(alpha);
	ptr[0] = Unmult(ptr[0], scale);
	ptr[1] = Unmult(ptr[1], scale);
	ptr[2] = Unmult(ptr[2], scale);
	}
	}
	}
	}

	int ReadTIFF(const uint8_t* const data, size_t data_size,
	WebPPicture* const pic, int keep_alpha,
	Metadata* const metadata) {
	MyData my_data = { data, (toff_t)data_size, 0 };
	TIFF* tif;
	uint32_t width, height;
	uint16_t samples_per_px = 0;
	uint16_t extra_samples = 0;
	uint16_t* extra_samples_ptr = NULL;
	uint32_t* raster;
	int64_t alloc_size;
	int ok = 0;
	tdir_t dircount;

	if (data == NULL \|\| data_size == 0 \|\| data_size > INT_MAX \|\| pic == NULL) {
	return 0;
	}

	tif = TIFFClientOpen("Memory", "r", &my_data,
	MyRead, MyRead, MySeek, MyClose,
	MySize, MyMapFile, MyUnmapFile);
	if (tif == NULL) {
	fprintf(stderr, "Error! Cannot parse TIFF file\n");
	return 0;
	}

	dircount = TIFFNumberOfDirectories(tif);
	if (dircount > 1) {
	fprintf(stderr, "Warning: multi-directory TIFF files are not supported.\n"
	"Only the first will be used, %d will be ignored.\n",
	dircount - 1);
	}
	if (!TIFFGetFieldDefaulted(tif, TIFFTAG_SAMPLESPERPIXEL, &samples_per_px)) {
	fprintf(stderr, "Error! Cannot retrieve TIFF samples-per-pixel info.\n");
	goto End;
	}
	if (samples_per_px < 3 \|\| samples_per_px > 4) goto End; // not supported

	if (!(TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &width) &&
	TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &height))) {
	fprintf(stderr, "Error! Cannot retrieve TIFF image dimensions.\n");
	goto End;
	}
	if (!ImgIoUtilCheckSizeArgumentsOverflow((uint64_t)width * height,
	sizeof(*raster))) {
	goto End;
	}
	if (samples_per_px > 3 && !TIFFGetField(tif, TIFFTAG_EXTRASAMPLES,
	&extra_samples, &extra_samples_ptr)) {
	fprintf(stderr, "Error! Cannot retrieve TIFF ExtraSamples info.\n");
	goto End;
	}

	// _Tiffmalloc uses a signed type for size.
	alloc_size = (int64_t)((uint64_t)width * height * sizeof(*raster));
	if (alloc_size < 0 \|\| alloc_size != (tsize_t)alloc_size) goto End;

	raster = (uint32*)_TIFFmalloc((tsize_t)alloc_size);
	if (raster != NULL) {
	if (TIFFReadRGBAImageOriented(tif, width, height, raster,
	ORIENTATION_TOPLEFT, 1)) {
	const int stride = width * sizeof(*raster);
	pic->width = width;
	pic->height = height;
	// TIFF data is ABGR
	#ifdef WORDS_BIGENDIAN
	TIFFSwabArrayOfLong(raster, width * height);
	#endif
	// if we have an alpha channel, we must un-multiply from rgbA to RGBA
	if (extra_samples == 1 && extra_samples_ptr != NULL &&
	extra_samples_ptr[0] == EXTRASAMPLE_ASSOCALPHA) {
	uint32_t y;
	uint8_t* tmp = (uint8_t*)raster;
	for (y = 0; y < height; ++y) {
	MultARGBRow(tmp, width);
	tmp += stride;
	}
	}
	ok = keep_alpha
	? WebPPictureImportRGBA(pic, (const uint8_t*)raster, stride)
	: WebPPictureImportRGBX(pic, (const uint8_t*)raster, stride);
	}
	_TIFFfree(raster);
	} else {
	fprintf(stderr, "Error allocating TIFF RGBA memory!\n");
	}

	if (ok) {
	if (metadata != NULL) {
	ok = ExtractMetadataFromTIFF(tif, metadata);
	if (!ok) {
	fprintf(stderr, "Error extracting TIFF metadata!\n");
	MetadataFree(metadata);
	WebPPictureFree(pic);
	}
	}
	}
	End:
	TIFFClose(tif);
	return ok;
	}
	#else // !WEBP_HAVE_TIFF
	int ReadTIFF(const uint8_t* const data, size_t data_size,
	struct WebPPicture* const pic, int keep_alpha,
	struct Metadata* const metadata) {
	(void)data;
	(void)data_size;
	(void)pic;
	(void)keep_alpha;
	(void)metadata;
	fprintf(stderr, "TIFF support not compiled. Please install the libtiff "
	"development package before building.\n");
	return 0;
	}
	#endif // WEBP_HAVE_TIFF

	// -----------------------------------------------------------------------------