145 lines
3.6 KiB
C
145 lines
3.6 KiB
C
/* Buffered inputput from a VipsSource
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*
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* J.Cupitt, 18/11/19
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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#ifndef VIPS_SBUF_H
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#define VIPS_SBUF_H
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#include <glib.h>
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#include <glib-object.h>
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#include <vips/object.h>
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#ifdef __cplusplus
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extern "C" {
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#endif /*__cplusplus*/
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#define VIPS_TYPE_SBUF (vips_sbuf_get_type())
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#define VIPS_SBUF( obj ) \
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(G_TYPE_CHECK_INSTANCE_CAST( (obj), \
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VIPS_TYPE_SBUF, VipsSbuf ))
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#define VIPS_SBUF_CLASS( klass ) \
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(G_TYPE_CHECK_CLASS_CAST( (klass), \
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VIPS_TYPE_SBUF, VipsSbufClass))
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#define VIPS_IS_SBUF( obj ) \
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(G_TYPE_CHECK_INSTANCE_TYPE( (obj), VIPS_TYPE_SBUF ))
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#define VIPS_IS_SBUF_CLASS( klass ) \
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(G_TYPE_CHECK_CLASS_TYPE( (klass), VIPS_TYPE_SBUF ))
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#define VIPS_SBUF_GET_CLASS( obj ) \
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(G_TYPE_INSTANCE_GET_CLASS( (obj), \
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VIPS_TYPE_SBUF, VipsSbufClass ))
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#define VIPS_SBUF_BUFFER_SIZE (4096)
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/* Layer over source: read with an input buffer.
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*
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* Libraries like libjpeg do their own input buffering and need raw IO, but
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* others, like radiance, need to parse the input into lines. A buffered read
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* class is very convenient.
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*/
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typedef struct _VipsSbuf {
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VipsObject parent_object;
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/*< private >*/
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/* The VipsSource we wrap.
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*/
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VipsSource *source;
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/* The +1 means there's always a \0 byte at the end.
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*
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* Unsigned char, since we don't want >127 to be -ve.
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*
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* chars_in_buffer is how many chars we have in input_buffer,
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* read_point is the current read position in that buffer.
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*/
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unsigned char input_buffer[VIPS_SBUF_BUFFER_SIZE + 1];
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int chars_in_buffer;
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int read_point;
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/* Build lines of text here.
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*/
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unsigned char line[VIPS_SBUF_BUFFER_SIZE + 1];
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} VipsSbuf;
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typedef struct _VipsSbufClass {
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VipsObjectClass parent_class;
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} VipsSbufClass;
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VIPS_API
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GType vips_sbuf_get_type( void );
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VIPS_API
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VipsSbuf *vips_sbuf_new_from_source( VipsSource *source );
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VIPS_API
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void vips_sbuf_unbuffer( VipsSbuf *sbuf );
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VIPS_API
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int vips_sbuf_getc( VipsSbuf *sbuf );
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#define VIPS_SBUF_GETC( S ) ( \
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(S)->read_point < (S)->chars_in_buffer ? \
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(S)->input_buffer[(S)->read_point++] : \
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vips_sbuf_getc( S ) \
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)
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VIPS_API
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void vips_sbuf_ungetc( VipsSbuf *sbuf );
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#define VIPS_SBUF_UNGETC( S ) { \
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if( (S)->read_point > 0 ) \
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(S)->read_point -= 1; \
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}
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VIPS_API
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int vips_sbuf_require( VipsSbuf *sbuf, int require );
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#define VIPS_SBUF_REQUIRE( S, R ) ( \
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(S)->read_point + (R) <= (S)->chars_in_buffer ? \
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0 : \
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vips_sbuf_require( (S), (R) ) \
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)
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#define VIPS_SBUF_PEEK( S ) ((S)->input_buffer + (S)->read_point)
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#define VIPS_SBUF_FETCH( S ) ((S)->input_buffer[(S)->read_point++])
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VIPS_API
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const char *vips_sbuf_get_line( VipsSbuf *sbuf );
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VIPS_API
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char *vips_sbuf_get_line_copy( VipsSbuf *sbuf );
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VIPS_API
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const char *vips_sbuf_get_non_whitespace( VipsSbuf *sbuf );
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VIPS_API
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int vips_sbuf_skip_whitespace( VipsSbuf *sbuf );
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#ifdef __cplusplus
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}
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#endif /*__cplusplus*/
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#endif /*VIPS_SBUF_H*/
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