git.imager.perl.org - imager.git/blame_incremental

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Commit	Line	Data
	1	#ifndef IMAGER_IOLAYERT_H
	2	#define IMAGER_IOLAYERT_H
	3
	4	#ifndef _MSC_VER
	5	#include <unistd.h>
	6	#endif
	7	#include <sys/types.h>
	8	#include <stddef.h>
	9	#include <stdio.h>
	10
	11	typedef enum { FDSEEK, FDNOSEEK, BUFFER, CBSEEK, CBNOSEEK, BUFCHAIN } io_type;
	12
	13	#ifdef _MSC_VER
	14	typedef int ssize_t;
	15	#endif
	16
	17	typedef struct i_io_glue_t i_io_glue_t;
	18
	19	/* compatibility for now */
	20	typedef i_io_glue_t io_glue;
	21
	22	/* Callbacks we give out */
	23
	24	typedef ssize_t(i_io_readp_t) (io_glue ig, void *buf, size_t count);
	25	typedef ssize_t(i_io_writep_t)(io_glue ig, const void *buf, size_t count);
	26	typedef off_t (i_io_seekp_t) (io_glue ig, off_t offset, int whence);
	27	typedef int (i_io_closep_t)(io_glue ig);
	28	typedef ssize_t(i_io_sizep_t) (io_glue ig);
	29
	30	typedef void (i_io_closebufp_t)(void p);
	31	typedef void (i_io_destroyp_t)(i_io_glue_t ig);
	32
	33
	34	/* Callbacks we get */
	35
	36	typedef ssize_t(i_io_readl_t) (void p, void *buf, size_t count);
	37	typedef ssize_t(i_io_writel_t)(void p, const void *buf, size_t count);
	38	typedef off_t (i_io_seekl_t) (void p, off_t offset, int whence);
	39	typedef int (i_io_closel_t)(void p);
	40	typedef void (i_io_destroyl_t)(void p);
	41	typedef ssize_t(i_io_sizel_t) (void p);
	42
	43	extern char *io_type_names[];
	44
	45
	46
	47	/* Structures to describe data sources */
	48
	49	struct i_io_glue_t {
	50	io_type type;
	51	void *exdata;
	52	i_io_readp_t readcb;
	53	i_io_writep_t writecb;
	54	i_io_seekp_t seekcb;
	55	i_io_closep_t closecb;
	56	i_io_sizep_t sizecb;
	57	i_io_destroyp_t destroycb;
	58	unsigned char *buffer;
	59	unsigned char *read_ptr;
	60	unsigned char *read_end;
	61	unsigned char *write_ptr;
	62	unsigned char *write_end;
	63	size_t buf_size;
	64
	65	/* non-zero if we encountered EOF */
	66	int buf_eof;
	67
	68	/* non-zero if we've seen an error */
	69	int error;
	70
	71	/* if non-zero we do write buffering (enabled by default) */
	72	int buffered;
	73
	74	im_context_t context;
	75	};
	76
	77	#define I_IO_DUMP_CALLBACKS 1
	78	#define I_IO_DUMP_BUFFER 2
	79	#define I_IO_DUMP_STATUS 4
	80	#define I_IO_DUMP_DEFAULT (I_IO_DUMP_BUFFER \| I_IO_DUMP_STATUS)
	81
	82	#define i_io_type(ig) ((ig)->source.ig_type)
	83	#define i_io_raw_read(ig, buf, size) ((ig)->readcb((ig), (buf), (size)))
	84	#define i_io_raw_write(ig, data, size) ((ig)->writecb((ig), (data), (size)))
	85	#define i_io_raw_seek(ig, offset, whence) ((ig)->seekcb((ig), (offset), (whence)))
	86	#define i_io_raw_close(ig) ((ig)->closecb(ig))
	87	#define i_io_is_buffered(ig) ((int)((ig)->buffered))
	88
	89	#define i_io_getc(ig) \
	90	((ig)->read_ptr < (ig)->read_end ? \
	91	*((ig)->read_ptr++) : \
	92	i_io_getc_imp(ig))
	93	#define i_io_nextc(ig) \
	94	((void)((ig)->read_ptr < (ig)->read_end ? \
	95	((ig)->read_ptr++, 0) : \
	96	i_io_getc_imp(ig)))
	97	#define i_io_peekc(ig) \
	98	((ig)->read_ptr < (ig)->read_end ? \
	99	*((ig)->read_ptr) : \
	100	i_io_peekc_imp(ig))
	101	#define i_io_putc(ig, c) \
	102	((ig)->write_ptr < (ig)->write_end && !(ig)->error ? \
	103	*(ig)->write_ptr++ = (c) : \
	104	i_io_putc_imp(ig, (c)))
	105	#define i_io_eof(ig) \
	106	((ig)->read_ptr == (ig)->read_end && (ig)->buf_eof)
	107	#define i_io_error(ig) \
	108	((ig)->read_ptr == (ig)->read_end && (ig)->error)
	109
	110	#endif