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start looking at xml parse use in vips.c

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This commit is contained in:
John Cupitt 2017-02-24 14:57:20 +00:00
parent 420a918cbf
commit dc2b567ee2
2 changed files with 43 additions and 0 deletions
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42
TODO
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@ -1,5 +1,47 @@
- added expat to required packages in configure.ac - added expat to required packages in configure.ac
try moving iofuncs/vips.c to expat
sample XML for us to parse
$ vipsheader -f getext babe.v
<?xml version="1.0"?>
<root xmlns="http://www.vips.ecs.soton.ac.uk/vips/7.39.0">
<header>
<field type="VipsRefString" name="Hist"/>
</header>
<meta>
<field type="VipsRefString" name="vips-loader">jpegload</field>
<field type="gint" name="jpeg-multiscan">0</field>
<field type="VipsRefString" name="exif-ifd0-X-Resolution">4294966289/169093161 (25.399999998, Rational, 1 components, 8 bytes)</field>
<field type="VipsRefString" name="exif-ifd0-Y-Resolution">4294966289/169093161 (25.399999998, Rational, 1 components, 8 bytes)</field>
<field type="VipsRefString" name="exif-ifd0-Resolution Unit">2 (Inch, Short, 1 components, 2 bytes)</field>
<field type="VipsRefString" name="exif-ifd2-Exif Version">Exif Version 2.1 (Exif Version 2.1, Undefined, 4 components, 4 bytes)</field>
<field type="VipsRefString" name="exif-ifd2-FlashPixVersion">FlashPix Version 1.0 (FlashPix Version 1.0, Undefined, 4 components, 4 bytes)</field>
<field type="VipsRefString" name="exif-ifd2-Colour Space">65535 (Internal error (unknown value 65535), Short, 1 components, 2 bytes)</field>
<field type="VipsRefString" name="resolution-unit">in</field><field type="VipsBlob" name="exif-data">
RXhpZgAATU0AKgAAAAgABAEaAAUAAAABAAAAPgEbAAUAAAABAAAARgEoAAMAAAABAAIAAIdpAAQA
AAABAAAATgAAAAD///wRChQoKf///BEKFCgpAAOQAAAHAAAABDAyMTCgAAAHAAAABDAxMDCgAQAD
AAAAAf//AAAAAAAA
</field>
</meta>
</root>
currently works like this
read_xml is called on image load
- loads extension bytes into memory
- calls libxml to parse it to an xmlDoc
- saves xmlDoc to VIPS_META_XML in header
rebuild_header called next
- gets xmlDoc from header
- gets "header" node
calls rebuild_header_builtin() for every field node
- gets "meta" field
calls rebuild_header_meta() for every field node
- vips linecache has access there twice! - vips linecache has access there twice!

1
libvips/iofuncs/vips.c
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@ -78,6 +78,7 @@
#include <io.h> #include <io.h>
#endif /*HAVE_IO_H*/ #endif /*HAVE_IO_H*/
#include <libxml/parser.h> #include <libxml/parser.h>
#include <expat.h>
#include <errno.h> #include <errno.h>
#ifdef OS_WIN32 #ifdef OS_WIN32