35 // Uuid of uuid box under the moov box.
39 // Uuid of uuid box containing PRVW box.
62 // Convenience class for a box.
63 class Box {  class
65   Box()  in Box()  function in piex::__anon2af2df940111::Box
71   Box(const BoxTag& tag, size_t offset, size_t header_length, size_t length)  in Box()  function in piex::__anon2af2df940111::Box
83   // Returns offset from start of file, including box's header.
85   // Returns offset from start of file of the next box, accounting for size of
86   // this box.
104 // ISO/IEC 14496-12 specification that all box fields are big endian.
110 // ISO/IEC 14496-12 specification that all box fields are big endian.
115 // Always big endian, based on ISO/IEC 14496-12 specification that all box
131 // Jpeg box offsets based on the box tag. The expected layout is as follows:
133 //                  0 [long]   size of box
134 //                  4 [char[]] box tag
146 // Processes box w/ JPEG data. Box must be PRVW and THMB boxes.
147 bool ProcessJpegBox(StreamInterface* stream, const Box& box, Image* image) {  in ProcessJpegBox()  argument
150   if (box.tag() != kPrvwTag && box.tag() != kThmbTag) {  in ProcessJpegBox()
154       box.tag() == kPrvwTag ? kPrvwJpegOffsets : kThmbJpegOffsets;  in ProcessJpegBox()
157   if (!Get16u(stream, box.offset() + offsets.width, &width)) {  in ProcessJpegBox()
160   if (!Get16u(stream, box.offset() + offsets.height, &height)) {  in ProcessJpegBox()
163   if (!Get32u(stream, box.offset() + offsets.jpeg_size, &jpeg_size)) {  in ProcessJpegBox()
169   image->offset = box.offset() + offsets.jpeg_data;  in ProcessJpegBox()
221 // Returns the next box or an invalid box.
224 // can be compact (32-bits) or extended (64-bit, e.g. mdat box).
228 // Fields in a box are big-endian.
229 Box GetNextBox(StreamInterface* stream, size_t offset) {  in GetNextBox()
232     return Box();  in GetNextBox()
238     return Box();  in GetNextBox()
246       return Box();  in GetNextBox()
254   return Box(tag, offset, header_offset, length);  in GetNextBox()
257 // Searches for the next box with the given tag.
258 Box GetNextBoxWithTag(StreamInterface* stream, size_t offset,  in GetNextBoxWithTag()
261     Box box = GetNextBox(stream, offset);  in GetNextBoxWithTag()  local
262     if (!box.IsValid() || box.tag() == expected_tag) {  in GetNextBoxWithTag()
263       return box;  in GetNextBoxWithTag()
265     offset = box.next_box_offset();  in GetNextBoxWithTag()
269 // Returns the width, height, and content type from the CRAW box.
270 bool ProcessCrawBox(StreamInterface* stream, const Box& craw_box,  in ProcessCrawBox()
289 // stsz box offset:
291 //                  0 [long]   size of box
292 //                  4 [char[]] box tag
297 bool ProcessStszBox(StreamInterface* stream, const Box& stsz_box,  in ProcessStszBox()
320 // co64 box offsets:
322 //                  0 [long]   size of box
323 //                  4 [char[]] box tag
327 bool ProcessCo64(StreamInterface* stream, const Box& co64_box,  in ProcessCo64()
339 // Process the stbl box. Expected box layout:
346 //   co64 (offset of embedded image, relative to mdat box)
347 bool ProcessStblBox(StreamInterface* stream, const Box& stbl_box,  in ProcessStblBox()
349   Box stsd_box = GetNextBoxWithTag(stream, stbl_box.header_offset(), kStsdTag);  in ProcessStblBox()
354   Box craw_box = GetNextBox(stream, stsd_box.header_offset() + 8);  in ProcessStblBox()
361   // CRAW contains info about the full-size image embedded in the mdat box.  in ProcessStblBox()
378   Box stsz_box =  in ProcessStblBox()
389   Box co64_box =  in ProcessStblBox()
406   // This offset is relative to the position of the mdat box. The value will  in ProcessStblBox()
412 // Returns true if we should parse the children of the box.
419 // Processes box and returns offset of the next box to process.
430 //     THMB (160x120 JPEG thumbnail, embedded in this box)
440 //                 image data is found in mdat box, below.)
447 //   PRVW (1620x1080 JPEG preview, embedded in this box)
451 size_t ProcessBox(StreamInterface* stream, const Box& box, ProcessData* data) {  in ProcessBox()  argument
453   if (box.tag() == kUuidTag) {  in ProcessBox()
454     // Uuid box have extended box types.  in ProcessBox()
456     if (stream->GetData(box.header_offset(), uuid.size(), uuid.data()) != kOk) {  in ProcessBox()
460       return box.header_offset() + uuid.size() + 8;  in ProcessBox()
462       return box.header_offset() + uuid.size();  in ProcessBox()
463     }  // else skip the box, below.  in ProcessBox()
464   } else if (DoProcessChildren(box.tag())) {  in ProcessBox()
465     return box.header_offset();  in ProcessBox()
468   // Potentially process the data contained in the box.  in ProcessBox()
470   if (box.tag() == kMdatTag) {  in ProcessBox()
473     data->mdat_image.offset += box.header_offset();  in ProcessBox()
475   } else if (box.tag() == kStblTag) {  in ProcessBox()
476     success = ProcessStblBox(stream, box, data);  in ProcessBox()
477   } else if (box.tag() == kPrvwTag) {  in ProcessBox()
479     success = ProcessJpegBox(stream, box, &data->prvw_image);  in ProcessBox()
480   } else if (box.tag() == kThmbTag) {  in ProcessBox()
482     success = ProcessJpegBox(stream, box, &data->preview_image_data->thumbnail);  in ProcessBox()
483   } else if (box.tag() == kCmt1Tag) {  in ProcessBox()
485         ParseExifIfd0(stream, box.header_offset(), data->preview_image_data);  in ProcessBox()
486   } else if (box.tag() == kCmt2Tag) {  in ProcessBox()
488         ParseExifExifIfd(stream, box.header_offset(), data->preview_image_data);  in ProcessBox()
490     // This box isn't interesting, skip it.  in ProcessBox()
493   return success ? box.next_box_offset() : 0;  in ProcessBox()
500     Box box = GetNextBox(stream, offset);  in ProcessStream()  local
501     if (!box.IsValid()) {  in ProcessStream()
504     size_t new_offset = ProcessBox(stream, box, data);  in ProcessStream()
508     if (box.tag() == last_chunk) {  in ProcessStream()
538   // Prefer image in mdata box, as spec ensures it is the largest image.  in Cr3GetPreviewData()