generated from bep/golibtemplate
-
-
Notifications
You must be signed in to change notification settings - Fork 1
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Add TIFF support, XMP support for JPEGs etc.
- Loading branch information
Showing
11 changed files
with
369 additions
and
177 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,75 @@ | ||
package imagemeta | ||
|
||
import ( | ||
"encoding/binary" | ||
"io" | ||
) | ||
|
||
type imageDecoderTIF struct { | ||
*baseStreamingDecoder | ||
} | ||
|
||
func (e *imageDecoderTIF) decode() error { | ||
const ( | ||
xmpMarker = 0x02bc | ||
meaningOfLife = 42 | ||
) | ||
|
||
// These are the sources we currently support in TIFF. | ||
sourceSet := TagSourceXMP | ||
// Remove sources that are not requested. | ||
sourceSet = sourceSet & e.opts.Sources | ||
|
||
if sourceSet.IsZero() { | ||
// Done. | ||
return nil | ||
} | ||
|
||
byteOrderTag := e.read2() | ||
switch byteOrderTag { | ||
case byteOrderBigEndian: | ||
e.byteOrder = binary.BigEndian | ||
case byteOrderLittleEndian: | ||
e.byteOrder = binary.LittleEndian | ||
default: | ||
return ErrInvalidFormat | ||
} | ||
|
||
if id := e.read2(); id != meaningOfLife { | ||
return ErrInvalidFormat | ||
} | ||
|
||
ifdOffset := e.read4() | ||
|
||
if ifdOffset < 8 { | ||
return ErrInvalidFormat | ||
} | ||
|
||
e.skip(int64(ifdOffset - 8)) | ||
|
||
entryCount := e.read2() | ||
|
||
for i := 0; i < int(entryCount); i++ { | ||
tag := e.read2() | ||
// Skip type | ||
e.skip(2) | ||
count := e.read4() | ||
valueOffset := e.read4() // Offset relative to the start of the file. | ||
if tag == xmpMarker { | ||
pos := e.pos() | ||
e.seek(int(valueOffset)) | ||
r := io.LimitReader(e.r, int64(count)) | ||
if err := decodeXMP(r, e.opts.HandleTag); err != nil { | ||
return err | ||
} | ||
sourceSet = sourceSet.Remove(TagSourceXMP) | ||
if sourceSet.IsZero() { | ||
return nil | ||
} | ||
e.seek(pos) | ||
} | ||
} | ||
|
||
return nil | ||
|
||
} |
Oops, something went wrong.