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rply.c
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rply.c
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/* ----------------------------------------------------------------------
* RPly library, read/write PLY files
* Diego Nehab, IMPA
* http://www.impa.br/~diego/software/rply
*
* This library is distributed under the MIT License. See notice
* at the end of this file.
* ---------------------------------------------------------------------- */
#include <stdio.h>
#include <ctype.h>
#include <assert.h>
#include <string.h>
#include <limits.h>
#include <float.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stddef.h>
#include "rply.h"
#define _CRT_SECURE_NO_DEPRECATE
/* ----------------------------------------------------------------------
* Make sure we get our integer types right
* ---------------------------------------------------------------------- */
#if defined(_MSC_VER) && (_MSC_VER < 1600)
/* C99 stdint.h only supported in MSVC++ 10.0 and up */
typedef __int8 t_ply_int8;
typedef __int16 t_ply_int16;
typedef __int32 t_ply_int32;
typedef unsigned __int8 t_ply_uint8;
typedef unsigned __int16 t_ply_uint16;
typedef unsigned __int32 t_ply_uint32;
#define PLY_INT8_MAX (127)
#define PLY_INT8_MIN (-PLY_INT8_MAX-1)
#define PLY_INT16_MAX (32767)
#define PLY_INT16_MIN (-PLY_INT16_MAX-1)
#define PLY_INT32_MAX (2147483647)
#define PLY_INT32_MIN (-PLY_INT32_MAX-1)
#define PLY_UINT8_MAX (255)
#define PLY_UINT16_MAX (65535)
#define PLY_UINT32_MAX (4294967295)
#else
#include <stdint.h>
typedef int8_t t_ply_int8;
typedef int16_t t_ply_int16;
typedef int32_t t_ply_int32;
typedef uint8_t t_ply_uint8;
typedef uint16_t t_ply_uint16;
typedef uint32_t t_ply_uint32;
#define PLY_INT8_MIN INT8_MIN
#define PLY_INT8_MAX INT8_MAX
#define PLY_INT16_MIN INT16_MIN
#define PLY_INT16_MAX INT16_MAX
#define PLY_INT32_MIN INT32_MIN
#define PLY_INT32_MAX INT32_MAX
#define PLY_UINT8_MAX UINT8_MAX
#define PLY_UINT16_MAX UINT16_MAX
#define PLY_UINT32_MAX UINT32_MAX
#endif
/* ----------------------------------------------------------------------
* Constants
* ---------------------------------------------------------------------- */
#define WORDSIZE 256
#define LINESIZE 1024
#define BUFFERSIZE (8*1024)
typedef enum e_ply_io_mode_ {
PLY_READ,
PLY_WRITE
} e_ply_io_mode;
static const char *const ply_storage_mode_list[] = {
"binary_big_endian", "binary_little_endian", "ascii", NULL
}; /* order matches e_ply_storage_mode enum */
static const char *const ply_type_list[] = {
"int8", "uint8", "int16", "uint16",
"int32", "uint32", "float32", "float64",
"char", "uchar", "short", "ushort",
"int", "uint", "float", "double",
"list", NULL
}; /* order matches e_ply_type enum */
/* ----------------------------------------------------------------------
* Property reading callback argument
*
* element: name of element being processed
* property: name of property being processed
* nelements: number of elements of this kind in file
* instance_index: index current element of this kind being processed
* length: number of values in current list (or 1 for scalars)
* value_index: index of current value int this list (or 0 for scalars)
* value: value of property
* pdata/idata: user data defined with ply_set_cb
*
* Returns handle to PLY file if succesful, NULL otherwise.
* ---------------------------------------------------------------------- */
typedef struct t_ply_argument_ {
p_ply_element element;
long instance_index;
p_ply_property property;
long length, value_index;
double value;
void *pdata;
long idata;
} t_ply_argument;
/* ----------------------------------------------------------------------
* Property information
*
* name: name of this property
* type: type of this property (list or type of scalar value)
* length_type, value_type: type of list property count and values
* read_cb: function to be called when this property is called
*
* Returns 1 if should continue processing file, 0 if should abort.
* ---------------------------------------------------------------------- */
typedef struct t_ply_property_ {
char name[WORDSIZE];
e_ply_type type, value_type, length_type;
p_ply_read_cb read_cb;
void *pdata;
long idata;
} t_ply_property;
/* ----------------------------------------------------------------------
* Element information
*
* name: name of this property
* ninstances: number of elements of this type in file
* property: property descriptions for this element
* nproperty: number of properties in this element
*
* Returns 1 if should continue processing file, 0 if should abort.
* ---------------------------------------------------------------------- */
typedef struct t_ply_element_ {
char name[WORDSIZE];
long ninstances;
p_ply_property property;
long nproperties;
} t_ply_element;
/* ----------------------------------------------------------------------
* Input/output driver
*
* Depending on file mode, different functions are used to read/write
* property fields. The drivers make it transparent to read/write in ascii,
* big endian or little endian cases.
* ---------------------------------------------------------------------- */
typedef int (*p_ply_ihandler)(p_ply ply, double *value);
typedef int (*p_ply_ichunk)(p_ply ply, void *anydata, size_t size);
typedef struct t_ply_idriver_ {
p_ply_ihandler ihandler[16];
p_ply_ichunk ichunk;
const char *name;
} t_ply_idriver;
typedef t_ply_idriver *p_ply_idriver;
typedef int (*p_ply_ohandler)(p_ply ply, double value);
typedef int (*p_ply_ochunk)(p_ply ply, void *anydata, size_t size);
typedef struct t_ply_odriver_ {
p_ply_ohandler ohandler[16];
p_ply_ochunk ochunk;
const char *name;
} t_ply_odriver;
typedef t_ply_odriver *p_ply_odriver;
/* ----------------------------------------------------------------------
* Ply file handle.
*
* io_mode: read or write (from e_ply_io_mode)
* storage_mode: mode of file associated with handle (from e_ply_storage_mode)
* element: elements description for this file
* nelement: number of different elements in file
* comment: comments for this file
* ncomments: number of comments in file
* obj_info: obj_info items for this file
* nobj_infos: number of obj_info items in file
* fp: file pointer associated with ply file
* rn: skip extra char after end_header?
* buffer: last word/chunck of data read from ply file
* buffer_first, buffer_last: interval of untouched good data in buffer
* buffer_token: start of parsed token (line or word) in buffer
* idriver, odriver: input driver used to get property fields from file
* argument: storage space for callback arguments
* welement, wproperty: element/property type being written
* winstance_index: index of instance of current element being written
* wvalue_index: index of list property value being written
* wlength: number of values in list property being written
* error_cb: error callback
* pdata/idata: user data defined with ply_open/ply_create
* ---------------------------------------------------------------------- */
typedef struct t_ply_ {
e_ply_io_mode io_mode;
e_ply_storage_mode storage_mode;
p_ply_element element;
long nelements;
char *comment;
long ncomments;
char *obj_info;
long nobj_infos;
FILE *fp;
int rn;
char buffer[BUFFERSIZE];
size_t buffer_first, buffer_token, buffer_last;
p_ply_idriver idriver;
p_ply_odriver odriver;
t_ply_argument argument;
long welement, wproperty;
long winstance_index, wvalue_index, wlength;
p_ply_error_cb error_cb;
void *pdata;
long idata;
} t_ply;
/* ----------------------------------------------------------------------
* I/O functions and drivers
* ---------------------------------------------------------------------- */
static t_ply_idriver ply_idriver_ascii;
static t_ply_idriver ply_idriver_binary;
static t_ply_idriver ply_idriver_binary_reverse;
static t_ply_odriver ply_odriver_ascii;
static t_ply_odriver ply_odriver_binary;
static t_ply_odriver ply_odriver_binary_reverse;
static int ply_read_word(p_ply ply);
static int ply_check_word(p_ply ply);
static void ply_finish_word(p_ply ply, size_t size);
static int ply_read_line(p_ply ply);
static int ply_check_line(p_ply ply);
static int ply_read_chunk(p_ply ply, void *anybuffer, size_t size);
static int ply_read_chunk_reverse(p_ply ply, void *anybuffer, size_t size);
static int ply_write_chunk(p_ply ply, void *anybuffer, size_t size);
static int ply_write_chunk_reverse(p_ply ply, void *anybuffer, size_t size);
static void ply_reverse(void *anydata, size_t size);
/* ----------------------------------------------------------------------
* String functions
* ---------------------------------------------------------------------- */
static int ply_find_string(const char *item, const char* const list[]);
static p_ply_element ply_find_element(p_ply ply, const char *name);
static p_ply_property ply_find_property(p_ply_element element,
const char *name);
/* ----------------------------------------------------------------------
* Header parsing
* ---------------------------------------------------------------------- */
static int ply_read_header_magic(p_ply ply);
static int ply_read_header_format(p_ply ply);
static int ply_read_header_comment(p_ply ply);
static int ply_read_header_obj_info(p_ply ply);
static int ply_read_header_property(p_ply ply);
static int ply_read_header_element(p_ply ply);
/* ----------------------------------------------------------------------
* Error handling
* ---------------------------------------------------------------------- */
static void ply_error_cb(p_ply ply, const char *message);
static void ply_ferror(p_ply ply, const char *fmt, ...);
/* ----------------------------------------------------------------------
* Memory allocation and initialization
* ---------------------------------------------------------------------- */
static void ply_init(p_ply ply);
static void ply_element_init(p_ply_element element);
static void ply_property_init(p_ply_property property);
static p_ply ply_alloc(void);
static p_ply_element ply_grow_element(p_ply ply);
static p_ply_property ply_grow_property(p_ply ply, p_ply_element element);
static void *ply_grow_array(p_ply ply, void **pointer, long *nmemb, long size);
/* ----------------------------------------------------------------------
* Special functions
* ---------------------------------------------------------------------- */
static e_ply_storage_mode ply_arch_endian(void);
static int ply_type_check(void);
/* ----------------------------------------------------------------------
* Auxiliary read functions
* ---------------------------------------------------------------------- */
static int ply_read_element(p_ply ply, p_ply_element element,
p_ply_argument argument);
static int ply_read_property(p_ply ply, p_ply_element element,
p_ply_property property, p_ply_argument argument);
static int ply_read_list_property(p_ply ply, p_ply_element element,
p_ply_property property, p_ply_argument argument);
static int ply_read_scalar_property(p_ply ply, p_ply_element element,
p_ply_property property, p_ply_argument argument);
/* ----------------------------------------------------------------------
* Buffer support functions
* ---------------------------------------------------------------------- */
/* pointers to tokenized word and line in buffer */
#define BWORD(p) (p->buffer + p->buffer_token)
#define BLINE(p) (p->buffer + p->buffer_token)
/* pointer to start of untouched bytes in buffer */
#define BFIRST(p) (p->buffer + p->buffer_first)
/* number of bytes untouched in buffer */
#define BSIZE(p) (p->buffer_last - p->buffer_first)
/* consumes data from buffer */
#define BSKIP(p, s) (p->buffer_first += s)
/* refills the buffer */
static int BREFILL(p_ply ply) {
/* move untouched data to beginning of buffer */
size_t size = BSIZE(ply);
memmove(ply->buffer, BFIRST(ply), size);
ply->buffer_last = size;
ply->buffer_first = ply->buffer_token = 0;
/* fill remaining with new data */
size = fread(ply->buffer+size, 1, BUFFERSIZE-size-1, ply->fp);
/* place sentinel so we can use str* functions with buffer */
ply->buffer[BUFFERSIZE-1] = '\0';
/* check if read failed */
if (size <= 0) return 0;
/* increase size to account for new data */
ply->buffer_last += size;
return 1;
}
/* We don't care about end-of-line, generally, because we
* separate words by any white-space character.
* Unfortunately, in binary mode, right after 'end_header',
* we have to know *exactly* how many characters to skip */
/* We use the end-of-line marker after the 'ply' magic
* number to figure out what to do */
static int ply_read_header_magic(p_ply ply) {
char *magic = ply->buffer;
if (!BREFILL(ply)) {
ply->error_cb(ply, "Unable to read magic number from file");
return 0;
}
/* check if it is ply */
if (magic[0] != 'p' || magic[1] != 'l' || magic[2] != 'y'
|| !isspace(magic[3])) {
ply->error_cb(ply, "Wrong magic number. Expected 'ply'");
return 0;
}
/* figure out if we have to skip the extra character
* after header when we reach the binary part of file */
ply->rn = magic[3] == '\r' && magic[4] == '\n';
BSKIP(ply, 3);
return 1;
}
/* ----------------------------------------------------------------------
* Exported functions
* ---------------------------------------------------------------------- */
/* ----------------------------------------------------------------------
* Read support functions
* ---------------------------------------------------------------------- */
p_ply ply_open(const char *name, p_ply_error_cb error_cb,
long idata, void *pdata) {
FILE *fp = NULL;
p_ply ply = ply_alloc();
if (error_cb == NULL) error_cb = ply_error_cb;
if (!ply) {
error_cb(NULL, "Out of memory");
return NULL;
}
ply->idata = idata;
ply->pdata = pdata;
ply->io_mode = PLY_READ;
ply->error_cb = error_cb;
if (!ply_type_check()) {
error_cb(ply, "Incompatible type system");
free(ply);
return NULL;
}
assert(name);
fp = fopen(name, "rb");
if (!fp) {
error_cb(ply, "Unable to open file");
free(ply);
return NULL;
}
ply->fp = fp;
return ply;
}
int ply_read_header(p_ply ply) {
assert(ply && ply->fp && ply->io_mode == PLY_READ);
if (!ply_read_header_magic(ply)) return 0;
if (!ply_read_word(ply)) return 0;
/* parse file format */
if (!ply_read_header_format(ply)) {
ply_ferror(ply, "Invalid file format");
return 0;
}
/* parse elements, comments or obj_infos until the end of header */
while (strcmp(BWORD(ply), "end_header")) {
if (!ply_read_header_comment(ply) &&
!ply_read_header_element(ply) &&
!ply_read_header_obj_info(ply)) {
ply_ferror(ply, "Unexpected token '%s'", BWORD(ply));
return 0;
}
}
/* skip extra character? */
if (ply->rn) {
if (BSIZE(ply) < 1 && !BREFILL(ply)) {
ply_ferror(ply, "Unexpected end of file");
return 0;
}
BSKIP(ply, 1);
}
return 1;
}
long ply_set_read_cb(p_ply ply, const char *element_name,
const char* property_name, p_ply_read_cb read_cb,
void *pdata, long idata) {
p_ply_element element = NULL;
p_ply_property property = NULL;
assert(ply && element_name && property_name);
element = ply_find_element(ply, element_name);
if (!element) return 0;
property = ply_find_property(element, property_name);
if (!property) return 0;
property->read_cb = read_cb;
property->pdata = pdata;
property->idata = idata;
return (int) element->ninstances;
}
int ply_read(p_ply ply) {
long i;
p_ply_argument argument;
assert(ply && ply->fp && ply->io_mode == PLY_READ);
argument = &ply->argument;
/* for each element type */
for (i = 0; i < ply->nelements; i++) {
p_ply_element element = &ply->element[i];
argument->element = element;
if (!ply_read_element(ply, element, argument))
return 0;
}
return 1;
}
/* ----------------------------------------------------------------------
* Write support functions
* ---------------------------------------------------------------------- */
p_ply ply_create(const char *name, e_ply_storage_mode storage_mode,
p_ply_error_cb error_cb, long idata, void *pdata) {
FILE *fp = NULL;
p_ply ply = ply_alloc();
if (error_cb == NULL) error_cb = ply_error_cb;
if (!ply) {
error_cb(NULL, "Out of memory");
return NULL;
}
if (!ply_type_check()) {
error_cb(ply, "Incompatible type system");
free(ply);
return NULL;
}
assert(name && storage_mode <= PLY_DEFAULT);
fp = fopen(name, "wb");
if (!fp) {
error_cb(ply, "Unable to create file");
free(ply);
return NULL;
}
ply->idata = idata;
ply->pdata = pdata;
ply->io_mode = PLY_WRITE;
if (storage_mode == PLY_DEFAULT) storage_mode = ply_arch_endian();
if (storage_mode == PLY_ASCII) ply->odriver = &ply_odriver_ascii;
else if (storage_mode == ply_arch_endian())
ply->odriver = &ply_odriver_binary;
else ply->odriver = &ply_odriver_binary_reverse;
ply->storage_mode = storage_mode;
ply->fp = fp;
ply->error_cb = error_cb;
return ply;
}
int ply_add_element(p_ply ply, const char *name, long ninstances) {
p_ply_element element = NULL;
assert(ply && ply->fp && ply->io_mode == PLY_WRITE);
assert(name && strlen(name) < WORDSIZE && ninstances >= 0);
if (strlen(name) >= WORDSIZE || ninstances < 0) {
ply_ferror(ply, "Invalid arguments");
return 0;
}
element = ply_grow_element(ply);
if (!element) return 0;
strcpy(element->name, name);
element->ninstances = ninstances;
return 1;
}
int ply_add_scalar_property(p_ply ply, const char *name, e_ply_type type) {
p_ply_element element = NULL;
p_ply_property property = NULL;
assert(ply && ply->fp && ply->io_mode == PLY_WRITE);
assert(name && strlen(name) < WORDSIZE);
assert(type < PLY_LIST);
if (strlen(name) >= WORDSIZE || type >= PLY_LIST) {
ply_ferror(ply, "Invalid arguments");
return 0;
}
element = &ply->element[ply->nelements-1];
property = ply_grow_property(ply, element);
if (!property) return 0;
strcpy(property->name, name);
property->type = type;
return 1;
}
int ply_add_list_property(p_ply ply, const char *name,
e_ply_type length_type, e_ply_type value_type) {
p_ply_element element = NULL;
p_ply_property property = NULL;
assert(ply && ply->fp && ply->io_mode == PLY_WRITE);
assert(name && strlen(name) < WORDSIZE);
if (strlen(name) >= WORDSIZE) {
ply_ferror(ply, "Invalid arguments");
return 0;
}
assert(length_type < PLY_LIST);
assert(value_type < PLY_LIST);
if (length_type >= PLY_LIST || value_type >= PLY_LIST) {
ply_ferror(ply, "Invalid arguments");
return 0;
}
element = &ply->element[ply->nelements-1];
property = ply_grow_property(ply, element);
if (!property) return 0;
strcpy(property->name, name);
property->type = PLY_LIST;
property->length_type = length_type;
property->value_type = value_type;
return 1;
}
int ply_add_property(p_ply ply, const char *name, e_ply_type type,
e_ply_type length_type, e_ply_type value_type) {
if (type == PLY_LIST)
return ply_add_list_property(ply, name, length_type, value_type);
else
return ply_add_scalar_property(ply, name, type);
}
int ply_add_comment(p_ply ply, const char *comment) {
char *new_comment = NULL;
assert(ply && comment && strlen(comment) < LINESIZE);
if (!comment || strlen(comment) >= LINESIZE) {
ply_ferror(ply, "Invalid arguments");
return 0;
}
new_comment = (char *) ply_grow_array(ply, (void **) &ply->comment,
&ply->ncomments, LINESIZE);
if (!new_comment) return 0;
strcpy(new_comment, comment);
return 1;
}
int ply_add_obj_info(p_ply ply, const char *obj_info) {
char *new_obj_info = NULL;
assert(ply && obj_info && strlen(obj_info) < LINESIZE);
if (!obj_info || strlen(obj_info) >= LINESIZE) {
ply_ferror(ply, "Invalid arguments");
return 0;
}
new_obj_info = (char *) ply_grow_array(ply, (void **) &ply->obj_info,
&ply->nobj_infos, LINESIZE);
if (!new_obj_info) return 0;
strcpy(new_obj_info, obj_info);
return 1;
}
int ply_write_header(p_ply ply) {
long i, j;
assert(ply && ply->fp && ply->io_mode == PLY_WRITE);
assert(ply->element || ply->nelements == 0);
assert(!ply->element || ply->nelements > 0);
if (fprintf(ply->fp, "ply\nformat %s 1.0\n",
ply_storage_mode_list[ply->storage_mode]) <= 0) goto error;
for (i = 0; i < ply->ncomments; i++)
if (fprintf(ply->fp, "comment %s\n", ply->comment + LINESIZE*i) <= 0)
goto error;
for (i = 0; i < ply->nobj_infos; i++)
if (fprintf(ply->fp, "obj_info %s\n", ply->obj_info + LINESIZE*i) <= 0)
goto error;
for (i = 0; i < ply->nelements; i++) {
p_ply_element element = &ply->element[i];
assert(element->property || element->nproperties == 0);
assert(!element->property || element->nproperties > 0);
if (fprintf(ply->fp, "element %s %ld\n", element->name,
element->ninstances) <= 0) goto error;
for (j = 0; j < element->nproperties; j++) {
p_ply_property property = &element->property[j];
if (property->type == PLY_LIST) {
if (fprintf(ply->fp, "property list %s %s %s\n",
ply_type_list[property->length_type],
ply_type_list[property->value_type],
property->name) <= 0) goto error;
} else {
if (fprintf(ply->fp, "property %s %s\n",
ply_type_list[property->type],
property->name) <= 0) goto error;
}
}
}
return fprintf(ply->fp, "end_header\n") > 0;
error:
ply_ferror(ply, "Error writing to file");
return 0;
}
int ply_write(p_ply ply, double value) {
p_ply_element element = NULL;
p_ply_property property = NULL;
int type = -1;
int breakafter = 0;
int spaceafter = 1;
if (ply->welement > ply->nelements) return 0;
element = &ply->element[ply->welement];
if (ply->wproperty > element->nproperties) return 0;
property = &element->property[ply->wproperty];
if (property->type == PLY_LIST) {
if (ply->wvalue_index == 0) {
type = property->length_type;
ply->wlength = (long) value;
} else type = property->value_type;
} else {
type = property->type;
ply->wlength = 0;
}
if (!ply->odriver->ohandler[type](ply, value)) {
ply_ferror(ply, "Failed writing %s of %s %d (%s: %s)",
property->name, element->name,
ply->winstance_index,
ply->odriver->name, ply_type_list[type]);
return 0;
}
ply->wvalue_index++;
if (ply->wvalue_index > ply->wlength) {
ply->wvalue_index = 0;
ply->wproperty++;
}
if (ply->wproperty >= element->nproperties) {
ply->wproperty = 0;
ply->winstance_index++;
breakafter = 1;
spaceafter = 0;
}
if (ply->winstance_index >= element->ninstances) {
ply->winstance_index = 0;
do {
ply->welement++;
element = &ply->element[ply->welement];
} while (ply->welement < ply->nelements && !element->ninstances);
}
if (ply->storage_mode == PLY_ASCII) {
return (!spaceafter || putc(' ', ply->fp) > 0) &&
(!breakafter || putc('\n', ply->fp) > 0);
} else {
return 1;
}
}
int ply_close(p_ply ply) {
long i;
assert(ply && ply->fp);
assert(ply->element || ply->nelements == 0);
assert(!ply->element || ply->nelements > 0);
/* write last chunk to file */
if (ply->io_mode == PLY_WRITE &&
fwrite(ply->buffer, 1, ply->buffer_last, ply->fp) < ply->buffer_last) {
ply_ferror(ply, "Error closing up");
return 0;
}
fclose(ply->fp);
/* free all memory used by handle */
if (ply->element) {
for (i = 0; i < ply->nelements; i++) {
p_ply_element element = &ply->element[i];
if (element->property) free(element->property);
}
free(ply->element);
}
if (ply->obj_info) free(ply->obj_info);
if (ply->comment) free(ply->comment);
free(ply);
return 1;
}
/* ----------------------------------------------------------------------
* Query support functions
* ---------------------------------------------------------------------- */
p_ply_element ply_get_next_element(p_ply ply,
p_ply_element last) {
assert(ply);
if (!last) return ply->element;
last++;
if (last < ply->element + ply->nelements) return last;
else return NULL;
}
int ply_get_element_info(p_ply_element element, const char** name,
long *ninstances) {
assert(element);
if (name) *name = element->name;
if (ninstances) *ninstances = (long) element->ninstances;
return 1;
}
p_ply_property ply_get_next_property(p_ply_element element,
p_ply_property last) {
assert(element);
if (!last) return element->property;
last++;
if (last < element->property + element->nproperties) return last;
else return NULL;
}
int ply_get_property_info(p_ply_property property, const char** name,
e_ply_type *type, e_ply_type *length_type, e_ply_type *value_type) {
assert(property);
if (name) *name = property->name;
if (type) *type = property->type;
if (length_type) *length_type = property->length_type;
if (value_type) *value_type = property->value_type;
return 1;
}
const char *ply_get_next_comment(p_ply ply, const char *last) {
assert(ply);
if (!last) return ply->comment;
last += LINESIZE;
if (last < ply->comment + LINESIZE*ply->ncomments) return last;
else return NULL;
}
const char *ply_get_next_obj_info(p_ply ply, const char *last) {
assert(ply);
if (!last) return ply->obj_info;
last += LINESIZE;
if (last < ply->obj_info + LINESIZE*ply->nobj_infos) return last;
else return NULL;
}
/* ----------------------------------------------------------------------
* Callback argument support functions
* ---------------------------------------------------------------------- */
int ply_get_argument_element(p_ply_argument argument,
p_ply_element *element, long *instance_index) {
assert(argument);
if (!argument) return 0;
if (element) *element = argument->element;
if (instance_index) *instance_index = argument->instance_index;
return 1;
}
int ply_get_argument_property(p_ply_argument argument,
p_ply_property *property, long *length, long *value_index) {
assert(argument);
if (!argument) return 0;
if (property) *property = argument->property;
if (length) *length = argument->length;
if (value_index) *value_index = argument->value_index;
return 1;
}
int ply_get_argument_user_data(p_ply_argument argument, void **pdata,
long *idata) {
assert(argument);
if (!argument) return 0;
if (pdata) *pdata = argument->pdata;
if (idata) *idata = argument->idata;
return 1;
}
double ply_get_argument_value(p_ply_argument argument) {
assert(argument);
if (!argument) return 0.0;
return argument->value;
}
int ply_get_ply_user_data(p_ply ply, void **pdata, long *idata) {
assert(ply);
if (!ply) return 0;
if (pdata) *pdata = ply->pdata;
if (idata) *idata = ply->idata;
return 1;
}
/* ----------------------------------------------------------------------
* Internal functions
* ---------------------------------------------------------------------- */
static int ply_read_list_property(p_ply ply, p_ply_element element,
p_ply_property property, p_ply_argument argument) {
int l;
p_ply_read_cb read_cb = property->read_cb;
p_ply_ihandler *driver = ply->idriver->ihandler;
/* get list length */
p_ply_ihandler handler = driver[property->length_type];
double length;
if (!handler(ply, &length)) {
ply_ferror(ply, "Error reading '%s' of '%s' number %d",
property->name, element->name, argument->instance_index);
return 0;
}
/* invoke callback to pass length in value field */
argument->length = (long) length;
argument->value_index = -1;
argument->value = length;
if (read_cb && !read_cb(argument)) {
ply_ferror(ply, "Aborted by user");
return 0;
}
/* read list values */
handler = driver[property->value_type];
/* for each value in list */
for (l = 0; l < (long) length; l++) {
/* read value from file */
argument->value_index = l;
if (!handler(ply, &argument->value)) {
ply_ferror(ply, "Error reading value number %d of '%s' of "
"'%s' number %d", l+1, property->name,
element->name, argument->instance_index);
return 0;
}
/* invoke callback to pass value */
if (read_cb && !read_cb(argument)) {
ply_ferror(ply, "Aborted by user");
return 0;
}
}
return 1;
}
static int ply_read_scalar_property(p_ply ply, p_ply_element element,
p_ply_property property, p_ply_argument argument) {
p_ply_read_cb read_cb = property->read_cb;
p_ply_ihandler *driver = ply->idriver->ihandler;
p_ply_ihandler handler = driver[property->type];
argument->length = 1;
argument->value_index = 0;
if (!handler(ply, &argument->value)) {
ply_ferror(ply, "Error reading '%s' of '%s' number %d",
property->name, element->name, argument->instance_index);
return 0;
}
if (read_cb && !read_cb(argument)) {
ply_ferror(ply, "Aborted by user");
return 0;
}
return 1;
}
static int ply_read_property(p_ply ply, p_ply_element element,
p_ply_property property, p_ply_argument argument) {
if (property->type == PLY_LIST)
return ply_read_list_property(ply, element, property, argument);
else
return ply_read_scalar_property(ply, element, property, argument);
}
static int ply_read_element(p_ply ply, p_ply_element element,
p_ply_argument argument) {
long j, k;
/* for each element of this type */
for (j = 0; j < element->ninstances; j++) {
argument->instance_index = j;
/* for each property */
for (k = 0; k < element->nproperties; k++) {
p_ply_property property = &element->property[k];
argument->property = property;
argument->pdata = property->pdata;
argument->idata = property->idata;
if (!ply_read_property(ply, element, property, argument))
return 0;
}
}
return 1;
}
static int ply_find_string(const char *item, const char* const list[]) {
int i;
assert(item && list);
for (i = 0; list[i]; i++)
if (!strcmp(list[i], item)) return i;
return -1;
}
static p_ply_element ply_find_element(p_ply ply, const char *name) {
p_ply_element element;
int i, nelements;
assert(ply && name);
element = ply->element;
nelements = ply->nelements;
assert(element || nelements == 0);
assert(!element || nelements > 0);
for (i = 0; i < nelements; i++)
if (!strcmp(element[i].name, name)) return &element[i];
return NULL;
}
static p_ply_property ply_find_property(p_ply_element element,
const char *name) {
p_ply_property property;
int i, nproperties;
assert(element && name);
property = element->property;
nproperties = element->nproperties;
assert(property || nproperties == 0);
assert(!property || nproperties > 0);
for (i = 0; i < nproperties; i++)
if (!strcmp(property[i].name, name)) return &property[i];
return NULL;
}
static int ply_check_word(p_ply ply) {
size_t size = strlen(BWORD(ply));
if (size >= WORDSIZE) {
ply_ferror(ply, "Word too long");
return 0;
} else if (size == 0) {
ply_ferror(ply, "Unexpected end of file");
return 0;
}
return 1;
}
static int ply_read_word(p_ply ply) {
size_t t = 0;
assert(ply && ply->fp && ply->io_mode == PLY_READ);
/* skip leading blanks */
while (1) {
t = strspn(BFIRST(ply), " \n\r\t");
/* check if all buffer was made of blanks */
if (t >= BSIZE(ply)) {
if (!BREFILL(ply)) {
ply_ferror(ply, "Unexpected end of file");
return 0;
}
} else break;
}
BSKIP(ply, t);
/* look for a space after the current word */
t = strcspn(BFIRST(ply), " \n\r\t");
/* if we didn't reach the end of the buffer, we are done */
if (t < BSIZE(ply)) {
ply_finish_word(ply, t);
return ply_check_word(ply);
}
/* otherwise, try to refill buffer */
if (!BREFILL(ply)) {
/* if we reached the end of file, try to do with what we have */
ply_finish_word(ply, t);
return ply_check_word(ply);
/* ply_ferror(ply, "Unexpected end of file"); */
/* return 0; */
}
/* keep looking from where we left */
t += strcspn(BFIRST(ply) + t, " \n\r\t");
/* check if the token is too large for our buffer */
if (t >= BSIZE(ply)) {
ply_ferror(ply, "Token too large");
return 0;
}
/* we are done */
ply_finish_word(ply, t);
return ply_check_word(ply);
}
static void ply_finish_word(p_ply ply, size_t size) {
ply->buffer_token = ply->buffer_first;
BSKIP(ply, size);
*BFIRST(ply) = '\0';
BSKIP(ply, 1);
}
static int ply_check_line(p_ply ply) {
if (strlen(BLINE(ply)) >= LINESIZE) {
ply_ferror(ply, "Line too long");
return 0;
}
return 1;
}
static int ply_read_line(p_ply ply) {
const char *end = NULL;
assert(ply && ply->fp && ply->io_mode == PLY_READ);
/* look for a end of line */
end = strchr(BFIRST(ply), '\n');
/* if we didn't reach the end of the buffer, we are done */
if (end) {
ply->buffer_token = ply->buffer_first;
BSKIP(ply, end - BFIRST(ply));