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start adding buffered input

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This commit is contained in:
John Cupitt 2019-10-30 17:34:04 +00:00
parent 36ed7e7ef3
commit 1ea58f6edb
2 changed files with 50 additions and 1 deletions
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49
libvips/include/vips/stream.h
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@ -216,6 +216,54 @@ int vips_streami_rewind( VipsStreami *streami );
unsigned char *vips_streami_sniff( VipsStreami *streami, size_t length );
gint64 vips_streami_size( VipsStreami *streami );
#define VIPS_TYPE_STREAMIB (vips_streamib_get_type())
#define VIPS_STREAMIB( obj ) \
(G_TYPE_CHECK_INSTANCE_CAST( (obj), \
VIPS_TYPE_STREAMIB, VipsStreamib ))
#define VIPS_STREAMIB_CLASS( klass ) \
(G_TYPE_CHECK_CLASS_CAST( (klass), \
VIPS_TYPE_STREAMIB, VipsStreamibClass))
#define VIPS_IS_STREAMIB( obj ) \
(G_TYPE_CHECK_INSTANCE_TYPE( (obj), VIPS_TYPE_STREAMIB ))
#define VIPS_IS_STREAMIB_CLASS( klass ) \
(G_TYPE_CHECK_CLASS_TYPE( (klass), VIPS_TYPE_STREAMIB ))
#define VIPS_STREAMIB_GET_CLASS( obj ) \
(G_TYPE_INSTANCE_GET_CLASS( (obj), \
VIPS_TYPE_STREAMIB, VipsStreamibClass ))
#define VIPS_STREAMIB_BUFFER_SIZE (4096)
/* Layer over streami: read with an input buffer.
*
* Libraries like libjpeg do their own input buffering and need raw IO, but
* others, like radiance, need to parse the input into lines. A buffered read
* class is very convenient.
*/
typedef struct _VipsStreamib {
VipsStreami parent_object;
unsigned char input_buffer[VIPS_STREAMIB_BUFFER_SIZE];
unsigned char *read_point;
int bytes_remaining;
} VipsStreamib;
typedef struct _VipsStreamibClass {
VipsStreamiClass parent_class;
} VipsStreamibClass;
GType vips_streamib_get_type( void );
VipsStreamib *vips_streamib_new_from_descriptor( int descriptor );
VipsStreamib *vips_streamib_new_from_filename( const char *filename );
VipsStreamib *vips_streamib_new_from_blob( VipsBlob *blob );
VipsStreamib *vips_streamib_new_from_memory( const void *data, size_t size );
VipsStreamib *vips_streamib_new_from_options( const char *options );
unsigned char *vips_streamib_get_line( VipsStreamib *streamib,
void *data, size_t length );
#define VIPS_TYPE_STREAMO (vips_streamo_get_type())
#define VIPS_STREAMO( obj ) \
(G_TYPE_CHECK_INSTANCE_CAST( (obj), \
@ -280,7 +328,6 @@ void vips_streamo_finish( VipsStreamo *streamo );
int vips_streamo_writef( VipsStreamo *streamo, const char *fmt, ... )
__attribute__((format(printf, 2, 3)));
int vips_streamo_write_amp( VipsStreamo *streamo, const char *str );
#ifdef __cplusplus
}

2
libvips/iofuncs/streami.c
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@ -1043,3 +1043,5 @@ vips_streami_sniff( VipsStreami *streami, size_t length )
return( streami->sniff->data );
}