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#ifndef PBM_H_INCLUDED
#define PBM_H_INCLUDED
#include <netpbm/pm.h>
#ifdef __cplusplus
extern "C" {
#endif
#if 0
} /* to fake out automatic code indenters */
#endif
typedef unsigned char bit;
#define PBM_WHITE 0
#define PBM_BLACK 1
/* Magic constants. */
#define PBM_MAGIC1 'P'
#define PBM_MAGIC2 '1'
#define RPBM_MAGIC2 '4'
#define PBM_FORMAT (PBM_MAGIC1 * 256 + PBM_MAGIC2)
#define RPBM_FORMAT (PBM_MAGIC1 * 256 + RPBM_MAGIC2)
#define PBM_TYPE PBM_FORMAT
/* Macro for turning a format number into a type number. */
#define PBM_FORMAT_TYPE(f) \
((f) == PBM_FORMAT || (f) == RPBM_FORMAT ? PBM_TYPE : -1)
/* Declarations of routines. */
void
pbm_init(int * const argcP,
char ** const argv);
void
pbm_nextimage(FILE *file, int * const eofP);
bit *
pbm_allocrow(unsigned int const cols);
#define pbm_allocarray(cols, rows) \
((bit**) pm_allocarray(cols, rows, sizeof(bit)))
#define pbm_freearray(bits, rows) pm_freearray((char**) bits, rows)
#define pbm_freerow(bitrow) pm_freerow((char*) bitrow)
/* Beware of arithmetic overflows when using pbm_packed_bytes(),
pbm_allocrow_packed() and pbm_allocarray_packed().
When cols is signed int, pbm_packed_bytes(cols + 8) overflows
with large values. Same with pamP->width which is always signed int.
Function validateComputableSize() called by pbm_readpbminit()
provides a margin of 10, but the "+7" uses much of it.
To prevent overflows, cast cols or pamP->width to unsigned int
like this: pbm_packed_bytes((unsigned int) cols +8))
*/
#define pbm_packed_bytes(cols) (((cols)+7)/8)
#define pbm_allocrow_packed(cols) \
((unsigned char *) pm_allocrow(pbm_packed_bytes(cols), \
sizeof(unsigned char)))
#define pbm_freerow_packed(packed_bits) \
pm_freerow((char *) packed_bits)
#define pbm_allocarray_packed(cols, rows) ((unsigned char **) \
pm_allocarray(pbm_packed_bytes(cols), rows, sizeof(unsigned char)))
#define pbm_freearray_packed(packed_bits, rows) \
pm_freearray((char **) packed_bits, rows)
bit**
pbm_readpbm(FILE * const file,
int * const colsP,
int * const rowsP);
void
pbm_readpbminit(FILE * const file,
int * const colsP,
int * const rowsP, int * const formatP);
void
pbm_readpbmrow(FILE * const file,
bit * const bitrow,
int const cols,
int const format);
void
pbm_readpbmrow_packed(FILE * const file,
unsigned char * const packedBits,
int const cols,
int const format);
void
pbm_readpbmrow_bitoffset(FILE * const fileP,
unsigned char * const packedBits,
int const cols,
int const format,
unsigned int const offset);
void
pbm_cleanrowend_packed(unsigned char * const packedBits,
unsigned int const cols);
void
pbm_writepbminit(FILE * const fileP,
int const cols,
int const rows,
int const forceplain);
void
pbm_writepbm(FILE * const fileP,
bit ** const bits,
int const cols,
int const rows,
int const forceplain);
void
pbm_writepbmrow(FILE * const fileP,
const bit * const bitrow,
int const cols,
int const forceplain);
void
pbm_writepbmrow_packed(FILE * const fileP,
const unsigned char * const packed_bits,
int const cols,
int const forceplain);
void
pbm_writepbmrow_bitoffset(FILE * const ifP,
unsigned char * const packedBits,
unsigned int const cols,
int const format,
unsigned int const offset);
void
pbm_check(FILE * file, const enum pm_check_type check_type,
const int format, const int cols, const int rows,
enum pm_check_code * const retval_p);
bit
pbm_backgroundbitrow(const unsigned char * const packedBits,
unsigned int const cols,
unsigned int const offset);
#ifdef __cplusplus
}
#endif
#endif
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