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iio.c
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// IIO: a library for reading small images {{{1
//
// Goal: load an image (of unknown format) from a given FILE*
//
// Technique: read the first few bytes of the file to identify the format, and
// call the appropriate image library (lipng, lipjpeg, libtiff, etc). For
// simple, uncompressed formats, write the loading code by hand. For formats
// having a library with a nice API, call the library functions. For other or
// unrecognized formats use an external program (convert, anytopnm,
// gm convert...) to convert them into a readable format. If anything else
// fails, assume that the image is in headings+raw format, and try to extract
// its dimensions and headings using some heuristics (file name containing
// "%dx%d", headings containing ascii numbers, etc.)
//
// Difficulties: most image libraries expect to be fed a whole file, not a
// beheaded file. Thus, some hackery is necessary.
//
// See file "iio.txt" for slightly more detailed documentation, and "iio.h" for
// the API
//
// #includes {{{1
#include <assert.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include "iio.h" // only for IIO_MAX_DIMENSION
#ifdef I_CAN_HAS_LIBPNG
// ugly "feature" in png.h forces this header to be included first
# include <png.h>
#endif
// #defines {{{1
//
// configuration
//
#if _POSIX_C_SOURCE >= 200809L
# define I_CAN_HAS_FMEMOPEN 1
#endif
#if _POSIX_C_SOURCE >= 200112L
# define I_CAN_HAS_MKSTEMP 1
#endif
//
// enum-like, only used internally
//
#define IIO_TYPE_INT8 1
#define IIO_TYPE_UINT8 2
#define IIO_TYPE_INT16 3
#define IIO_TYPE_UINT16 4
#define IIO_TYPE_INT32 5
#define IIO_TYPE_UINT32 6
#define IIO_TYPE_FLOAT 7
#define IIO_TYPE_DOUBLE 8
#define IIO_TYPE_LONGDOUBLE 9
#define IIO_TYPE_INT64 10
#define IIO_TYPE_UINT64 11
#define IIO_TYPE_HALF 12
#define IIO_TYPE_UINT1 13
#define IIO_TYPE_UINT2 14
#define IIO_TYPE_UINT4 15
#define IIO_TYPE_CHAR 16
#define IIO_TYPE_SHORT 17
#define IIO_TYPE_INT 18
#define IIO_TYPE_LONG 19
#define IIO_TYPE_LONGLONG 20
#define IIO_FORMAT_WHATEVER 0
#define IIO_FORMAT_QNM 1
#define IIO_FORMAT_PNG 2
#define IIO_FORMAT_JPEG 3
#define IIO_FORMAT_TIFF 4
#define IIO_FORMAT_RIM 5
#define IIO_FORMAT_BMP 6
#define IIO_FORMAT_EXR 7
#define IIO_FORMAT_JP2 8
#define IIO_FORMAT_VTK 9
#define IIO_FORMAT_CIMG 10
#define IIO_FORMAT_PAU 11
#define IIO_FORMAT_DICOM 12
#define IIO_FORMAT_PFM 13
#define IIO_FORMAT_NIFTI 14
#define IIO_FORMAT_PCX 15
#define IIO_FORMAT_GIF 16
#define IIO_FORMAT_XPM 17
#define IIO_FORMAT_RAFA 18
#define IIO_FORMAT_FLO 19
#define IIO_FORMAT_JUV 20
#define IIO_FORMAT_LUM 21
#define IIO_FORMAT_PCM 22
#define IIO_FORMAT_ASC 23
#define IIO_FORMAT_UNRECOGNIZED (-1)
//
// sugar
//
#define FORI(n) for(int i=0;i<(int)(n);i++)
#define FORJ(n) for(int j=0;j<(int)(n);j++)
#define FORK(n) for(int k=0;k<(int)(n);k++)
#define FORL(n) for(int l=0;l<(int)(n);l++)
#ifdef IIO_SHOW_DEBUG_MESSAGES
# define IIO_DEBUG(...) do {\
fprintf(stderr,"DEBUG(%s:%d:%s): ",__FILE__,__LINE__,__PRETTY_FUNCTION__);\
fprintf(stderr,__VA_ARGS__);} while(0)
#else//IIO_SHOW_DEBUG_MESSAGES
# define IIO_DEBUG(...) do { do_nop(__VA_ARGS__); } while(0) /* nothing */
#endif//IIO_SHOW_DEBUG_MESSAGES
//
// hacks
//
#ifndef __attribute__
# ifndef __GNUC__
# define __attribute__(x) /*NOTHING*/
# endif
#endif
// typedefs {{{1
typedef long long longlong;
typedef long double longdouble;
// utility functions {{{1
#ifndef IIO_ABORT_ON_ERROR
// NOTE: libpng has a nasty "feature" whereby you have to include libpng.h
// before setjmp.h if you want to use both. This induces the following
// hackery:
# ifndef I_CAN_HAS_LIBPNG
# include <setjmp.h>
# endif//I_CAN_HAS_LIBPNG
static jmp_buf global_jump_buffer;
#endif//IIO_ABORT_ON_ERROR
//#include <errno.h> // only for errno
#include <ctype.h> // for isspace
#include <math.h> // for floorf
#include <stdlib.h>
#ifdef I_CAN_HAS_LINUX
# include <unistd.h>
static const char *emptystring = "";
static const char *myname(void)
{
# define n 0x29a
static char buf[n];
pid_t p = getpid();
snprintf(buf, n, "/proc/%d/cmdline", p);
FILE *f = fopen(buf, "r");
if (!f) return emptystring;
int c, i = 0;
while ((c = fgetc(f)) != EOF && i < n) {
# undef n
buf[i] = c ? c : ' ';
i += 1;
}
if (i) buf[i-1] = '\0';
fclose(f);
return buf;
}
#else
static const char *myname(void) { return ""; }
#endif//I_CAN_HAS_LINUX
static void fail(const char *fmt, ...) __attribute__((noreturn,format(printf,1,2)));
static void fail(const char *fmt, ...)
{
va_list argp;
fprintf(stderr, "\nERROR(\"%s\"): ", myname());
va_start(argp, fmt);
vfprintf(stderr, fmt, argp);
va_end(argp);
fprintf(stderr, "\n\n");
fflush(NULL);
// if (global_hack_to_never_fail)
// {
// IIO_DEBUG("now wave a dead chicken and press enter\n");
// getchar();
// return;
// }
// exit(43);
#ifndef IIO_ABORT_ON_ERROR
longjmp(global_jump_buffer, 1);
//iio_single_jmpstuff(true, false);
#else//IIO_ABORT_ON_ERROR
# ifdef NDEBUG
exit(-1);
# else//NDEBUG
//print_trace(stderr);
exit(*(int *)0x43);
# endif//NDEBUG
#endif//IIO_ABORT_ON_ERROR
}
static void do_nop(void *p, ...)
{
va_list argp;
va_start(argp, p);
va_end(argp);
}
static void *xmalloc(size_t size)
{
if (size == 0)
fail("xmalloc: zero size");
void *p = malloc(size);
if (!p)
{
double sm = size / (0x100000 * 1.0);
fail("xmalloc: out of memory when requesting "
"%zu bytes (%gMB)",//:\"%s\"",
size, sm);//, strerror(errno));
}
return p;
}
static void *xrealloc(void *p, size_t s)
{
void *r = realloc(p, s);
if (!r) fail("realloc failed");
return r;
}
static void xfree(void *p)
{
if (!p)
fail("thou shalt not free a null pointer!");
free(p);
}
static const
char *global_variable_containing_the_name_of_the_last_opened_file = NULL;
static FILE *xfopen(const char *s, const char *p)
{
global_variable_containing_the_name_of_the_last_opened_file = NULL;
FILE *f;
if (!s) fail("trying to open a file with NULL name");
if (0 == strcmp("-", s))
{
if (0 == strcmp("w", p))
return stdout;
else if (0 == strcmp("r", p))
return stdin;
else
fail("unknown fopen mode \"%s\"", p);
}
if (0 == strcmp("--", s) && 0 == strcmp("w", p)) return stderr;
f = fopen(s, p);
if (f == NULL)
fail("can not open file \"%s\" in mode \"%s\"",// (%s)",
s, p);//, strerror(errno));
global_variable_containing_the_name_of_the_last_opened_file = s;
return f;
}
static void xfclose(FILE *f)
{
global_variable_containing_the_name_of_the_last_opened_file = NULL;
if (f != stdout && f != stdin && f != stderr) {
int r = fclose(f);
if (r) fail("fclose error");// \"%s\"", strerror(errno));
}
}
static int pick_char_for_sure(FILE *f)
{
int c = getc(f);
if (EOF == c)
fail("input file ended before expected");
//IIO_DEBUG("pcs = '%c'\n", c);
return c;
}
static void eat_spaces(FILE *f)
{
//IIO_DEBUG("inside eat spaces\n");
int c;
do
c = pick_char_for_sure(f);
while (isspace(c));
ungetc(c, f);
}
static void eat_line(FILE *f)
{
//IIO_DEBUG("inside eat line\n");
while (pick_char_for_sure(f) != '\n')
;
}
static void eat_spaces_and_comments(FILE *f)
{
//IIO_DEBUG("inside eat spaces and comments\n");
int c, comment_char = '#';
eat_spaces(f);
uppsala:
c = pick_char_for_sure(f);
if (c == comment_char)
{
eat_line(f);
eat_spaces(f);
} else
ungetc(c, f);
if (c == comment_char) goto uppsala;
}
static void fill_temporary_filename(char *out)
{
#ifdef I_CAN_HAS_MKSTEMP
static char tfn[] = "/tmp/iio_temporary_file_XXXXXX\0";
int r = mkstemp(tfn);
if (r == -1) fail("caca [tfn]");
#else
static char buf[L_tmpnam+1];
char *tfn = tmpnam(buf);
#endif//I_CAN_HAS_MKSTEMP
strcpy(out, tfn);
}
// struct iio_image { ... }; {{{1
// This struct is used for exchanging image information between internal
// functions. It could be safely eliminated, and this information be passed as
// five or six variables.
struct iio_image {
int dimension; // 1, 2, 3 or 4, typically
int sizes[IIO_MAX_DIMENSION];
int pixel_dimension;
int type; // IIO_TYPE_*
int meta; // IIO_META_*
int format; // IIO_FORMAT_*
bool contiguous_data;
bool caca[3];
void *data;
};
// struct iio_image management {{{1
static void iio_image_assert_struct_consistency(struct iio_image *x)
{
assert(x->dimension > 0);
assert(x->dimension <= IIO_MAX_DIMENSION);
FORI(x->dimension) assert(x->sizes[i] > 0);
assert(x->pixel_dimension > 0);
switch(x->type) {
case IIO_TYPE_INT8: case IIO_TYPE_UINT8: case IIO_TYPE_INT16:
case IIO_TYPE_UINT16: case IIO_TYPE_INT32: case IIO_TYPE_UINT32:
case IIO_TYPE_FLOAT: case IIO_TYPE_DOUBLE: case IIO_TYPE_LONGDOUBLE:
case IIO_TYPE_INT64: case IIO_TYPE_UINT64: case IIO_TYPE_HALF:
case IIO_TYPE_CHAR: case IIO_TYPE_SHORT: case IIO_TYPE_INT:
case IIO_TYPE_LONG: case IIO_TYPE_LONGLONG: break;
default: assert(false);
}
//if (x->contiguous_data)
// assert(x->data == (void*)(x+1));
}
// API
static size_t iio_type_size(int type)
{
switch(type) {
case IIO_TYPE_INT8: return 1;
case IIO_TYPE_UINT8: return 1;
case IIO_TYPE_INT16: return 2;
case IIO_TYPE_UINT16: return 2;
case IIO_TYPE_INT32: return 4;
case IIO_TYPE_UINT32: return 4;
case IIO_TYPE_INT64: return 8;
case IIO_TYPE_UINT64: return 8;
case IIO_TYPE_CHAR: return sizeof(char); // 1
case IIO_TYPE_SHORT: return sizeof(short);
case IIO_TYPE_INT: return sizeof(int);
case IIO_TYPE_LONG: return sizeof(long);
case IIO_TYPE_LONGLONG: return sizeof(long long);
case IIO_TYPE_FLOAT: return sizeof(float);
case IIO_TYPE_DOUBLE: return sizeof(double);
case IIO_TYPE_LONGDOUBLE: return sizeof(long double);
case IIO_TYPE_HALF: return sizeof(float)/2;
default: fail("unrecognized type %d", type);
}
}
// XXX TODO FIXME: this is architecture dependent!
// this function actually requires A LOT of magic to be portable
// the present solution works well for the typical 32 and 64 bit platforms
static int normalize_type(int type_in)
{
int type_out;
switch(type_in) {
case IIO_TYPE_CHAR: type_out = IIO_TYPE_UINT8; break;
case IIO_TYPE_SHORT: type_out = IIO_TYPE_INT16; break;
case IIO_TYPE_INT: type_out = IIO_TYPE_UINT32; break;
default: type_out = type_in; break;
}
if (type_out != type_in) {
// the following assertion fails on many architectures
assert(iio_type_size(type_in) == iio_type_size(type_out));
}
return type_out;
}
// internal API
static
int iio_type_id(size_t sample_size, bool ieeefp_sample, bool signed_sample)
{
if (ieeefp_sample) {
if (signed_sample) fail("signed floats are a no-no!");
switch(sample_size) {
case sizeof(float): return IIO_TYPE_FLOAT;
case sizeof(double): return IIO_TYPE_DOUBLE;
case sizeof(long double): return IIO_TYPE_LONGDOUBLE;
case sizeof(float)/2: return IIO_TYPE_HALF;
default: fail("bad float size %zu", sample_size);
}
} else {
switch(sample_size) {
case 1: return signed_sample ? IIO_TYPE_INT8 : IIO_TYPE_UINT8;
case 2: return signed_sample ? IIO_TYPE_INT16 : IIO_TYPE_UINT16;
case 4: return signed_sample ? IIO_TYPE_INT32 : IIO_TYPE_UINT32;
case 8: return signed_sample ? IIO_TYPE_INT64 : IIO_TYPE_UINT64;
default: fail("bad integral size %zu", sample_size);
}
}
}
// internal API
static void iio_type_unid(int *size, bool *ieefp, bool *signedness, int type)
{
int t = normalize_type(type);
*size = iio_type_size(t);
*ieefp = (t==IIO_TYPE_HALF || t==IIO_TYPE_FLOAT
|| t==IIO_TYPE_DOUBLE || t==IIO_TYPE_LONGDOUBLE);
*signedness = (t==IIO_TYPE_INT8 || t==IIO_TYPE_INT16
|| t==IIO_TYPE_INT32 || t==IIO_TYPE_INT64);
}
// internal API
static int iio_image_number_of_elements(struct iio_image *x)
{
iio_image_assert_struct_consistency(x);
int r = 1;
FORI(x->dimension) r *= x->sizes[i];
return r;
}
// internal API
static int iio_image_number_of_samples(struct iio_image *x)
{
return iio_image_number_of_elements(x) * x->pixel_dimension;
}
// internal API
static size_t iio_image_sample_size(struct iio_image *x)
{
return iio_type_size(x->type);
}
static const char *iio_strtyp(int type)
{
#define M(t) case IIO_TYPE_ ## t: return #t
switch(type) {
M(INT8); M(UINT8); M(INT16); M(UINT16); M(INT32); M(UINT32); M(INT64);
M(UINT64); M(FLOAT); M(DOUBLE); M(LONGDOUBLE); M(HALF); M(UINT1);
M(UINT2); M(UINT4); M(CHAR); M(SHORT); M(INT); M(LONG); M(LONGLONG);
default: return "unrecognized";
}
#undef M
}
static int iio_inttyp(const char *typename)
{
int n = strlen(typename);
char utyp[n+1]; utyp[n] = '\0';
for (int i = 0; i < n; i++)
utyp[i] = toupper(typename[i]);
#define M(t) if(!strcmp(utyp,#t))return IIO_TYPE_ ## t
M(INT8); M(UINT8); M(INT16); M(UINT16); M(INT32); M(UINT32); M(INT64);
M(UINT64); M(FLOAT); M(DOUBLE); M(LONGDOUBLE); M(HALF); M(UINT1);
M(UINT2); M(UINT4); M(CHAR); M(SHORT); M(INT); M(LONG); M(LONGLONG);
#undef M
fail("unrecognized typename \"%s\"", typename);
}
static const char *iio_strfmt(int format)
{
#define M(f) case IIO_FORMAT_ ## f: return #f
switch(format) {
M(WHATEVER); M(QNM); M(PNG); M(JPEG);
M(TIFF); M(RIM); M(BMP); M(EXR); M(JP2);
M(VTK); M(CIMG); M(PAU); M(DICOM); M(PFM); M(NIFTI);
M(PCX); M(GIF); M(XPM); M(RAFA); M(FLO); M(LUM); M(JUV);
M(PCM); M(ASC);
M(UNRECOGNIZED);
default: fail("caca de la grossa");
}
#undef M
}
inline
static void iio_print_image_info(FILE *f, struct iio_image *x)
{
fprintf(f, "iio_print_image_info %p\n", (void *)x);
fprintf(f, "dimension = %d\n", x->dimension);
int *s = x->sizes;
switch(x->dimension) {
case 1: fprintf(f, "size = %d\n", s[0]); break;
case 2: fprintf(f, "sizes = %dx%d\n", s[0],s[1]); break;
case 3: fprintf(f, "sizes = %dx%dx%d\n", s[0],s[1],s[2]); break;
case 4: fprintf(f, "sizes = %dx%dx%dx%d\n", s[0],s[1],s[2],s[3]); break;
default: fail("unsupported dimension %d", x->dimension);
}
fprintf(f, "pixel_dimension = %d\n", x->pixel_dimension);
fprintf(f, "type = %s\n", iio_strtyp(x->type));
fprintf(f, "data = %p\n", (void *)x->data);
}
static void iio_image_fill(struct iio_image *x,
int dimension, int *sizes,
int type, int pixel_dimension)
{
x->dimension = dimension;
FORI(dimension) x->sizes[i] = sizes[i];
x->type = type;
x->pixel_dimension = pixel_dimension;
x->data = NULL;
x->format = -1;
x->meta = -1;
x->contiguous_data = false;
}
static void iio_wrap_image_struct_around_data(struct iio_image *x,
int dimension, int *sizes, int pixel_dimension,
int type, void *data)
{
assert(dimension < IIO_MAX_DIMENSION);
x->dimension = dimension;
FORI(x->dimension) x->sizes[i] = sizes[i];
x->pixel_dimension = pixel_dimension;
x->type = type;
x->data = data;
x->contiguous_data = false;
x->meta = -42;
x->format = -42;
}
static void iio_image_build_independent(struct iio_image *x,
int dimension, int *sizes, int type, int pixel_dimension)
{
assert(dimension > 0);
assert(dimension <= 4);
assert(pixel_dimension > 0);
iio_image_fill(x, dimension, sizes, type, pixel_dimension);
size_t datalength = 1; FORI(dimension) datalength *= sizes[i];
size_t datasize = datalength * iio_type_size(type) * pixel_dimension;
x->data = xmalloc(datasize);
}
// data conversion {{{1
// macros to crop a numeric value
#define T0(x) ((x)>0?(x):0)
#define T8(x) ((x)>0?((x)<0xff?(x):0xff):0)
#define T6(x) ((x)>0?((x)<0xffff?(x):0xffff):0)
#define CC(a,b) (77*(a)+(b)) // hash number of a conversion pair
#define I8 IIO_TYPE_INT8
#define U8 IIO_TYPE_UINT8
#define I6 IIO_TYPE_INT16
#define U6 IIO_TYPE_UINT16
#define I2 IIO_TYPE_INT32
#define U2 IIO_TYPE_UINT32
#define I4 IIO_TYPE_INT64
#define U4 IIO_TYPE_UINT64
#define F4 IIO_TYPE_FLOAT
#define F8 IIO_TYPE_DOUBLE
#define F6 IIO_TYPE_LONGDOUBLE
static void convert_datum(void *dest, void *src, int dest_fmt, int src_fmt)
{
// NOTE: verify that this switch is optimized outside of the loop in
// which it is contained. Otherwise, produce some self-modifying code
// here.
switch(CC(dest_fmt,src_fmt)) {
// change of sign (lossless, but changes interpretation)
case CC(I8,U8): *( int8_t*)dest = *( uint8_t*)src; break;
case CC(I6,U6): *( int16_t*)dest = *(uint16_t*)src; break;
case CC(I2,U2): *( int32_t*)dest = *(uint32_t*)src; break;
case CC(U8,I8): *( uint8_t*)dest = *( int8_t*)src; break;
case CC(U6,I6): *(uint16_t*)dest = *( int16_t*)src; break;
case CC(U2,I2): *(uint32_t*)dest = *( int32_t*)src; break;
// different size signed integers (3 lossy, 3 lossless)
case CC(I8,I6): *( int8_t*)dest = *( int16_t*)src; break;//iw810
case CC(I8,I2): *( int8_t*)dest = *( int32_t*)src; break;//iw810
case CC(I6,I2): *( int16_t*)dest = *( int32_t*)src; break;//iw810
case CC(I6,I8): *( int16_t*)dest = *( int8_t*)src; break;
case CC(I2,I8): *( int32_t*)dest = *( int8_t*)src; break;
case CC(I2,I6): *( int32_t*)dest = *( int16_t*)src; break;
// different size unsigned integers (3 lossy, 3 lossless)
case CC(U8,U6): *( uint8_t*)dest = *(uint16_t*)src; break;//iw810
case CC(U8,U2): *( uint8_t*)dest = *(uint32_t*)src; break;//iw810
case CC(U6,U2): *(uint16_t*)dest = *(uint32_t*)src; break;//iw810
case CC(U6,U8): *(uint16_t*)dest = *( uint8_t*)src; break;
case CC(U2,U8): *(uint32_t*)dest = *( uint8_t*)src; break;
case CC(U2,U6): *(uint32_t*)dest = *(uint16_t*)src; break;
// diferent size mixed integers, make signed (3 lossy, 3 lossless)
case CC(I8,U6): *( int8_t*)dest = *(uint16_t*)src; break;//iw810
case CC(I8,U2): *( int8_t*)dest = *(uint32_t*)src; break;//iw810
case CC(I6,U2): *( int16_t*)dest = *(uint32_t*)src; break;//iw810
case CC(I6,U8): *( int16_t*)dest = *( uint8_t*)src; break;
case CC(I2,U8): *( int32_t*)dest = *( uint8_t*)src; break;
case CC(I2,U6): *( int32_t*)dest = *(uint16_t*)src; break;
// diferent size mixed integers, make unsigned (3 lossy, 3 lossless)
case CC(U8,I6): *( uint8_t*)dest = *( int16_t*)src; break;//iw810
case CC(U8,I2): *( uint8_t*)dest = *( int32_t*)src; break;//iw810
case CC(U6,I2): *(uint16_t*)dest = *( int32_t*)src; break;//iw810
case CC(U6,I8): *(uint16_t*)dest = *( int8_t*)src; break;
case CC(U2,I8): *(uint32_t*)dest = *( int8_t*)src; break;
case CC(U2,I6): *(uint32_t*)dest = *( int16_t*)src; break;
// from float (typically lossy, except for small integers)
case CC(I8,F4): *( int8_t*)dest = *( float*)src; break;//iw810
case CC(I6,F4): *( int16_t*)dest = *( float*)src; break;//iw810
case CC(I2,F4): *( int32_t*)dest = *( float*)src; break;
case CC(I8,F8): *( int8_t*)dest = *(double*)src; break;//iw810
case CC(I6,F8): *( int16_t*)dest = *(double*)src; break;//iw810
case CC(I2,F8): *( int32_t*)dest = *(double*)src; break;//iw810
case CC(U8,F4): *( uint8_t*)dest = T8(0.5+*( float*)src); break;//iw810
case CC(U6,F4): *(uint16_t*)dest = T6(0.5+*( float*)src); break;//iw810
case CC(U2,F4): *(uint32_t*)dest = *( float*)src; break;
case CC(U8,F8): *( uint8_t*)dest = T8(0.5+*(double*)src); break;//iw810
case CC(U6,F8): *(uint16_t*)dest = T6(0.5+*(double*)src); break;//iw810
case CC(U2,F8): *(uint32_t*)dest = *(double*)src; break;//iw810
// to float (typically lossless, except for large integers)
case CC(F4,I8): *( float*)dest = *( int8_t*)src; break;
case CC(F4,I6): *( float*)dest = *( int16_t*)src; break;
case CC(F4,I2): *( float*)dest = *( int32_t*)src; break;//iw810
case CC(F8,I8): *(double*)dest = *( int8_t*)src; break;
case CC(F8,I6): *(double*)dest = *( int16_t*)src; break;
case CC(F8,I2): *(double*)dest = *( int32_t*)src; break;
case CC(F4,U8): *( float*)dest = *( uint8_t*)src; break;
case CC(F4,U6): *( float*)dest = *(uint16_t*)src; break;
case CC(F4,U2): *( float*)dest = *(uint32_t*)src; break;//iw810
case CC(F8,U8): *(double*)dest = *( uint8_t*)src; break;
case CC(F8,U6): *(double*)dest = *(uint16_t*)src; break;
case CC(F8,U2): *(double*)dest = *(uint32_t*)src; break;
case CC(F8,F4): *(double*)dest = *( float*)src; break;
case CC(F4,F8): *( float*)dest = *( double*)src; break;
#ifdef I_CAN_HAS_INT64
// to int64_t and uint64_t
case CC(I4,I8): *( int64_t*)dest = *( int8_t*)src; break;
case CC(I4,I6): *( int64_t*)dest = *( int16_t*)src; break;
case CC(I4,I2): *( int64_t*)dest = *( int32_t*)src; break;
case CC(I4,U8): *( int64_t*)dest = *( uint8_t*)src; break;
case CC(I4,U6): *( int64_t*)dest = *(uint16_t*)src; break;
case CC(I4,U2): *( int64_t*)dest = *(uint32_t*)src; break;
case CC(I4,F4): *( int64_t*)dest = *( float*)src; break;
case CC(I4,F8): *( int64_t*)dest = *( double*)src; break;
case CC(U4,I8): *(uint64_t*)dest = *( int8_t*)src; break;
case CC(U4,I6): *(uint64_t*)dest = *( int16_t*)src; break;
case CC(U4,I2): *(uint64_t*)dest = *( int32_t*)src; break;
case CC(U4,U8): *(uint64_t*)dest = *( uint8_t*)src; break;
case CC(U4,U6): *(uint64_t*)dest = *(uint16_t*)src; break;
case CC(U4,U2): *(uint64_t*)dest = *(uint32_t*)src; break;
case CC(U4,F4): *(uint64_t*)dest = *( float*)src; break;
case CC(U4,F8): *(uint64_t*)dest = *( double*)src; break;
// from int64_t and uint64_t
case CC(I8,I4): *( int8_t*)dest = *( int64_t*)src; break;
case CC(I6,I4): *( int16_t*)dest = *( int64_t*)src; break;
case CC(I2,I4): *( int32_t*)dest = *( int64_t*)src; break;
case CC(U8,I4): *( uint8_t*)dest = *( int64_t*)src; break;
case CC(U6,I4): *(uint16_t*)dest = *( int64_t*)src; break;
case CC(U2,I4): *(uint32_t*)dest = *( int64_t*)src; break;
case CC(F4,I4): *( float*)dest = *( int64_t*)src; break;
case CC(F8,I4): *( double*)dest = *( int64_t*)src; break;
case CC(I8,U4): *( int8_t*)dest = *(uint64_t*)src; break;
case CC(I6,U4): *( int16_t*)dest = *(uint64_t*)src; break;
case CC(I2,U4): *( int32_t*)dest = *(uint64_t*)src; break;
case CC(U8,U4): *( uint8_t*)dest = *(uint64_t*)src; break;
case CC(U6,U4): *(uint16_t*)dest = *(uint64_t*)src; break;
case CC(U2,U4): *(uint32_t*)dest = *(uint64_t*)src; break;
case CC(F4,U4): *( float*)dest = *(uint64_t*)src; break;
case CC(F8,U4): *( double*)dest = *(uint64_t*)src; break;
#endif//I_CAN_HAS_INT64
#ifdef I_CAN_HAS_LONGDOUBLE
// to longdouble
case CC(F6,I8): *(longdouble*)dest = *( int8_t*)src; break;
case CC(F6,I6): *(longdouble*)dest = *( int16_t*)src; break;
case CC(F6,I2): *(longdouble*)dest = *( int32_t*)src; break;
case CC(F6,U8): *(longdouble*)dest = *( uint8_t*)src; break;
case CC(F6,U6): *(longdouble*)dest = *(uint16_t*)src; break;
case CC(F6,U2): *(longdouble*)dest = *(uint32_t*)src; break;
case CC(F6,F4): *(longdouble*)dest = *( float*)src; break;
case CC(F6,F8): *(longdouble*)dest = *( double*)src; break;
// from longdouble
case CC(I8,F6): *( int8_t*)dest = *(longdouble*)src; break;
case CC(I6,F6): *( int16_t*)dest = *(longdouble*)src; break;
case CC(I2,F6): *( int32_t*)dest = *(longdouble*)src; break;
case CC(U8,F6): *( uint8_t*)dest = T8(0.5+*(longdouble*)src); break;
case CC(U6,F6): *(uint16_t*)dest = T6(0.5+*(longdouble*)src); break;
case CC(U2,F6): *(uint32_t*)dest = *(longdouble*)src; break;
case CC(F4,F6): *( float*)dest = *(longdouble*)src; break;
case CC(F8,F6): *( double*)dest = *(longdouble*)src; break;
#ifdef I_CAN_HAS_INT64 //(nested)
case CC(F6,I4): *(longdouble*)dest = *( int64_t*)src; break;
case CC(F6,U4): *(longdouble*)dest = *(uint64_t*)src; break;
case CC(I4,F6): *( int64_t*)dest = *(longdouble*)src; break;
case CC(U4,F6): *(uint64_t*)dest = *(longdouble*)src; break;
#endif//I_CAN_HAS_INT64 (nested)
#endif//I_CAN_HAS_LONGDOUBLE
default: fail("bad conversion from %d to %d", src_fmt, dest_fmt);
}
}
#undef CC
#undef I8
#undef U8
#undef I6
#undef U6
#undef I2
#undef U2
#undef F4
#undef F8
#undef F6
static void *convert_data(void *src, int n, int dest_fmt, int src_fmt)
{
if (src_fmt == IIO_TYPE_FLOAT)
IIO_DEBUG("first float sample = %g\n", *(float*)src);
size_t src_width = iio_type_size(src_fmt);
size_t dest_width = iio_type_size(dest_fmt);
IIO_DEBUG("converting %d samples from %s to %s\n", n, iio_strtyp(src_fmt), iio_strtyp(dest_fmt));
IIO_DEBUG("src width = %zu\n", src_width);
IIO_DEBUG("dest width = %zu\n", dest_width);
char *r = xmalloc(n * dest_width);
// NOTE: the switch inside "convert_datum" should be optimized
// outside of this loop
FORI(n) {
void *to = i * dest_width + r;
void *from = i * src_width + (char *)src;
convert_datum(to, from, dest_fmt, src_fmt);
}
xfree(src);
if (dest_fmt == IIO_TYPE_INT16)
IIO_DEBUG("first short sample = %d\n", *(int16_t*)r);
return r;
}
static void unpack_nibbles_to_bytes(uint8_t out[2], uint8_t in)
{
out[1] = (in & 0x0f); //0b00001111
out[0] = (in & 0xf0)>>4; //0b11110000
}
static void unpack_couples_to_bytes(uint8_t out[4], uint8_t in)
{
out[3] = (in & 0x03); //0b00000011
out[2] = (in & 0x0c)>>2; //0b00001100
out[1] = (in & 0x30)>>4; //0b00110000
out[0] = (in & 0xc0)>>6; //0b11000000
}
static void unpack_bits_to_bytes(uint8_t out[8], uint8_t in)
{
out[7] = (in & 1) ? 1 : 0;
out[6] = (in & 2) ? 1 : 0;
out[5] = (in & 4) ? 1 : 0;
out[4] = (in & 8) ? 1 : 0;
out[3] = (in & 16) ? 1 : 0;
out[2] = (in & 32) ? 1 : 0;
out[1] = (in & 64) ? 1 : 0;
out[0] = (in & 128) ? 1 : 0;
}
static void unpack_to_bytes_here(uint8_t *dest, uint8_t *src, int n, int bits)
{
fprintf(stderr, "unpacking %d bytes %d-fold\n", n, bits);
assert(bits==1 || bits==2 || bits==4);
//size_t unpack_factor = 8 / bits;
switch(bits) {
case 1: FORI(n) unpack_bits_to_bytes(dest + 8*i, src[i]); break;
case 2: FORI(n) unpack_couples_to_bytes(dest + 4*i, src[i]); break;
case 4: FORI(n) unpack_nibbles_to_bytes(dest + 2*i, src[i]); break;
default: fail("very strange error");
}
}
static void iio_convert_samples(struct iio_image *x, int desired_type)
{
assert(!x->contiguous_data);
int source_type = normalize_type(x->type);
if (source_type == desired_type) return;
IIO_DEBUG("converting from %s to %s\n", iio_strtyp(x->type), iio_strtyp(desired_type));
int n = iio_image_number_of_samples(x);
x->data = convert_data(x->data, n, desired_type, source_type);
x->type = desired_type;
}
static void iio_hacky_colorize(struct iio_image *x, int pd)
{
assert(!x->contiguous_data);
if (x->pixel_dimension != 1)
fail("please, do not colorize color stuff");
int n = iio_image_number_of_elements(x);
int ss = iio_image_sample_size(x);
void *rdata = xmalloc(n*ss*pd);
char *data_dest = rdata;
char *data_src = x->data;
FORI(n)
FORJ(pd)
memcpy(data_dest + (pd*i + j)*ss, data_src + i*ss, ss);
xfree(x->data);
x->data=rdata;
x->pixel_dimension = pd;
}
// uncolorize
static void iio_hacky_uncolorize(struct iio_image *x)
{
assert(!x->contiguous_data);
if (x->pixel_dimension != 3)
fail("please, do not uncolorize non-color stuff");
assert(x->pixel_dimension == 3);
int source_type = normalize_type(x->type);
int n = iio_image_number_of_elements(x);
switch(source_type) {
case IIO_TYPE_UINT8: {
uint8_t (*xd)[3] = x->data;
uint8_t *r = xmalloc(n*sizeof*r);
FORI(n)
r[i] = .299*xd[i][0] + .587*xd[i][1] + .114*xd[i][2];
xfree(x->data);
x->data = r;
}
break;
case IIO_TYPE_FLOAT: {
float (*xd)[3] = x->data;
float *r = xmalloc(n*sizeof*r);
FORI(n)
r[i] = .299*xd[i][0] + .587*xd[i][1] + .114*xd[i][2];
xfree(x->data);
x->data = r;
}
break;
default: fail("uncolorize type not supported");
}
x->pixel_dimension = 1;
}
// uncolorize
static void iio_hacky_uncolorizea(struct iio_image *x)
{
assert(!x->contiguous_data);
if (x->pixel_dimension != 4)
fail("please, do not uncolorizea non-colora stuff");
assert(x->pixel_dimension == 4);
int source_type = normalize_type(x->type);
int n = iio_image_number_of_elements(x);
switch(source_type) {
case IIO_TYPE_UINT8: {
uint8_t (*xd)[4] = x->data;
uint8_t *r = xmalloc(n*sizeof*r);
FORI(n)
r[i] = .299*xd[i][0] + .587*xd[i][1] + .114*xd[i][2];
xfree(x->data);
x->data = r;
}
break;
case IIO_TYPE_FLOAT: {
float (*xd)[4] = x->data;
float *r = xmalloc(n*sizeof*r);
FORI(n)
r[i] = .299*xd[i][0] + .587*xd[i][1] + .114*xd[i][2];
xfree(x->data);
x->data = r;
}
break;
default: fail("uncolorizea type not supported");
}
x->pixel_dimension = 1;
}
// general memory and file utilities {{{1
// Input: a partially read stream "f"
// (of which "bufn" bytes are already read into "buf")
//
// Output: a malloc'd block with the whole file content
//
// Implementation: re-invent the wheel
static void *load_rest_of_file(long *on, FILE *f, void *buf, size_t bufn)
{
size_t n = bufn, ntop = n + 0x3000;
char *t = xmalloc(ntop);
if (!t) fail("out of mem (%zu) while loading file", ntop);
memcpy(t, buf, bufn);
while (1) {
if (n >= ntop) {
ntop = 1000 + 2*(ntop + 1);
t = xrealloc(t, ntop);
if (!t) fail("out of mem (%zu) loading file", ntop);
}
int r = fgetc(f);
if (r == EOF)
break;
t[n] = r;//iw810
n += 1;
}
*on = n;
return t;
}
// Input: a pointer to raw data
//
// Output: the name of a temporary file containing the data
//
// Implementation: re-invent the wheel
static char *put_data_into_temporary_file(void *filedata, size_t filesize)
{
#ifdef I_CAN_HAS_MKSTEMP
static char filename[] = "/tmp/iio_temporal_file_XXXXXX\0";
int r = mkstemp(filename);
if (r == -1) fail("caca [pditf]");
#else
// WARNING XXX XXX XXX ERROR FIXME TODO WARNING:
// this function is not reentrant
// (this should not a problem unless reading images on a parallel loop)
static char buf[L_tmpnam+1];
//
// from TMPNAM(3):
//
//The tmpnam() function returns a pointer to a string that is a
//valid filename, and such that a file with this name did not exist
//at some point in time, so that naive programmers may think it a
//suitable name for a temporary file.
//
char *filename = tmpnam(buf);
// MULTIPLE RACE CONDITIONS HERE
#endif
FILE *f = xfopen(filename, "w");
int cx = fwrite(filedata, filesize, 1, f);
if (cx != 1) fail("fwrite to temporary file failed");
xfclose(f);
return filename;
}
static void delete_temporary_file(char *filename)
{
(void)filename;
#ifdef NDEBUG