n_tiff.c File Reference

Reading the tags of a TIFF structured buffer. More...

#include "nilorea/n_tiff.h"
#include "nilorea/n_common.h"
#include "nilorea/n_log.h"
#include <string.h>

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Macros
#define	N_TIFF_MAX_ENTRIES   4096
	Most entries a directory is read for: a real TIFF directory holds tens, a DCP a few dozen; a count past this is a corrupt or hostile file.

Functions
static size_t	_n_tiff_type_size (uint16_t type)
	Bytes one value of a field type takes.
static uint16_t	_n_tiff_u16 (const N_TIFF *tiff, const unsigned char *p)
	Read a 16 bit value in the buffer's byte order.
static uint32_t	_n_tiff_u32 (const N_TIFF *tiff, const unsigned char *p)
	Read a 32 bit value in the buffer's byte order.
static uint64_t	_n_tiff_u64 (const N_TIFF *tiff, const unsigned char *p)
	Read a 64 bit value in the buffer's byte order.
size_t	n_tiff_count (const N_TIFF *tiff, uint16_t tag)
	How many values a tag has.
const N_TIFF_ENTRY *	n_tiff_find (const N_TIFF *tiff, uint16_t tag)
	Find an entry by tag.
void	n_tiff_free (N_TIFF **tiff)
	Release a parse, and set the pointer to NULL.
int	n_tiff_get_ascii (const N_TIFF *tiff, uint16_t tag, char *out, size_t out_len)
	Read an ASCII tag.
size_t	n_tiff_get_doubles (const N_TIFF *tiff, uint16_t tag, double *out, size_t max)
	Read a numeric tag as doubles.
N_TIFF *	n_tiff_parse (const unsigned char *data, size_t len)
	Parse the first directory of a TIFF structured buffer.

Detailed Description

Reading the tags of a TIFF structured buffer.

Author

Castagnier Mickael

Version

1.0

Date

28/09/2026

Definition in file n_tiff.c.

Macro Definition Documentation

N_TIFF_MAX_ENTRIES

#define N_TIFF_MAX_ENTRIES   4096

Most entries a directory is read for: a real TIFF directory holds tens, a DCP a few dozen; a count past this is a corrupt or hostile file.

Definition at line 36 of file n_tiff.c.

Referenced by n_tiff_parse().

Function Documentation

_n_tiff_type_size()

size_t _n_tiff_type_size ( uint16_t type )

static

Bytes one value of a field type takes.

Parameters

type	TIFF field type

Returns

its size, 0 for a type this reader does not know

Definition at line 41 of file n_tiff.c.

References type().

Referenced by n_tiff_get_doubles(), and n_tiff_parse().

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_n_tiff_u16()

uint16_t _n_tiff_u16 ( const N_TIFF * tiff, const unsigned char * p )

static

Read a 16 bit value in the buffer's byte order.

Parameters

tiff	the parse, for the byte order
p	where, already checked to be inside the buffer

Returns

the value

Definition at line 68 of file n_tiff.c.

References N_TIFF::big_endian.

Referenced by n_tiff_get_doubles(), and n_tiff_parse().

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_n_tiff_u32()

uint32_t _n_tiff_u32 ( const N_TIFF * tiff, const unsigned char * p )

static

Read a 32 bit value in the buffer's byte order.

Parameters

tiff	the parse, for the byte order
p	where, already checked to be inside the buffer

Returns

the value

Definition at line 78 of file n_tiff.c.

References N_TIFF::big_endian.

Referenced by _n_tiff_u64(), n_tiff_get_doubles(), and n_tiff_parse().

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_n_tiff_u64()

uint64_t _n_tiff_u64 ( const N_TIFF * tiff, const unsigned char * p )

static

Read a 64 bit value in the buffer's byte order.

Parameters

tiff	the parse, for the byte order
p	where, already checked to be inside the buffer

Returns

the value

Definition at line 88 of file n_tiff.c.

References _n_tiff_u32(), and N_TIFF::big_endian.

Referenced by n_tiff_get_doubles().

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