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Initial implementation of the reader

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This commit is contained in:
Abdelrahman Said
2024-04-21 02:39:34 +01:00
parent 61f0182c3f
commit 0bd448a8a9
3 changed files with 503 additions and 30 deletions
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56
src/main.c
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@@ -1,44 +1,54 @@
#include "aliases.h"
#include "mem_allocator.h"
#include "mem_ctx.h"
#include "tiffread.h"
#include <netinet/in.h>
#include <stdio.h>
#include <string.h>
int main(int argc, char *argv[]) {
wapp_mem_ctx_init(10 * 1024 * 1024, 2 * 1024 * 1024);
Allocator ctx_main_allocator = wapp_mem_ctx_allocator(CTX_DEST_BUFFER_MAIN);
Allocator ctx_temp_allocator = wapp_mem_ctx_allocator(CTX_DEST_BUFFER_TEMP);
(void)(ctx_temp_allocator);
const char *file_to_open = argc > 1 ? argv[1] : "./resources/test.tif";
FILE *fp = fopen(file_to_open, "r");
read_baseline_tiff(file_to_open, &ctx_main_allocator);
TiffHdr header;
TiffIFD ifd = {0};
// FILE *fp = fopen(file_to_open, "rb");
fread(&header, sizeof(TiffHdr), 1, fp);
// TiffHdr header;
// fread(&header, sizeof(header), 1, fp);
printf("ORDER: %04x\n", header.order);
printf("MAGIC: %04x\n", header.magic);
// TiffIFD ifd = {0};
fseek(fp, header.first_ifd_offset, SEEK_SET);
// printf("ORDER: %04x\n", header.order);
// printf("MAGIC: %04x\n", header.magic);
fread(&(ifd.count), sizeof(ifd.count), 1, fp);
// fseek(fp, header.first_ifd_offset, SEEK_SET);
printf("COUNT: %u\n", ifd.count);
// fread(&(ifd.count), sizeof(ifd.count), 1, fp);
TiffField fields[ifd.count];
memset(fields, 0, sizeof(TiffField) * ifd.count);
// printf("COUNT: %u\n", ifd.count);
for (u32 i = 0; i < ifd.count; ++i) {
fread(fields + i, sizeof(TiffField), 1, fp);
printf("ENTRY %02u\n", i);
printf("\t TAG: %04u (%s)\n", fields[i].tag,
tag_names[fields[i].tag] ? tag_names[fields[i].tag] : "UNKNOWN");
printf("\t TYPE: 0x%04x (%s)\n", fields[i].type,
filed_types[fields[i].type].name ? filed_types[fields[i].type].name
: "UNKNOWN");
printf("\t COUNT: %04u\n", fields[i].count);
printf("\tVAL/OFF: %04u\n", fields[i].value_offset);
}
// TiffField fields[ifd.count];
// memset(fields, 0, sizeof(TiffField) * ifd.count);
fclose(fp);
// for (u32 i = 0; i < ifd.count; ++i) {
// fread(fields + i, sizeof(TiffField), 1, fp);
// printf("ENTRY %02u (%lu)\n", i, ftell(fp));
// printf("\t TAG: %04u (%s)\n", fields[i].tag,
// tag_names[fields[i].tag] ? tag_names[fields[i].tag] : "UNKNOWN");
// printf("\t TYPE: 0x%04x (%s)\n", fields[i].type,
// field_types[fields[i].type].name ?
// field_types[fields[i].type].name
// : "UNKNOWN");
// printf("\t COUNT: %04u\n", fields[i].count);
// printf("\tVAL/OFF: %04u\n", fields[i].value_offset);
// }
wapp_mem_ctx_free();
return 0;
}

455
src/tiffread.c Normal file
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@@ -0,0 +1,455 @@
#include "tiffread.h"
#include "aliases.h"
#include "endianness.h"
#include "image.h"
#include "mem_allocator.h"
#include "mem_ctx.h"
#include "mem_libc.h"
#include <math.h>
#include <netinet/in.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#define TIFF_MAGIC 0x002a
#define TIFF_FILENAME_MIN_LENGTH 6
#define TIFF_EXT_MAX_LENGTH 5
#define IS_TIFF_EXTENSION(EXT) \
(strncmp(EXT, ".tif", 4) == 0 || strncmp(EXT, ".tiff", 5) == 0)
#define NULL_TIFF_HEADER ((TiffHdr){0})
#define IS_NULL_HEADER(HDR) (HDR.order == 0)
#define NULL_TIFF_IFD ((TiffIFD){0})
#define IS_NULL_IFD(IFD) (IFD.count == 0)
enum tiff_image_types {
TIFF_IMAGE_BILEVEL,
TIFF_IMAGE_GRAYSCALE,
TIFF_IMAGE_PALETTE,
TIFF_IMAGE_RGB,
COUNT_TIFF_IMAGE,
};
// clang-format off
internal u16 tiff_image_identifiers[COUNT_TIFF_IMAGE] = {
[TIFF_IMAGE_BILEVEL] = 0,
[TIFF_IMAGE_GRAYSCALE] = TIFF_PUBLIC_TAG_BITS_PER_SAMPLE,
[TIFF_IMAGE_PALETTE] = TIFF_PUBLIC_TAG_BITS_PER_SAMPLE | TIFF_PUBLIC_TAG_COLOR_MAP,
[TIFF_IMAGE_RGB] = TIFF_PUBLIC_TAG_BITS_PER_SAMPLE | TIFF_PUBLIC_TAG_SAMPLES_PER_PIXEL,
};
// clang-format on
TiffHdr read_tiff_header(FILE *fp);
TiffIFD read_ifd(FILE *fp, const TiffHdr *header, u32 offset,
const Allocator *allocator);
Image *read_fields(FILE *fp, const TiffHdr *header, const TiffIFD *ifd,
const Allocator *allocator);
void read_from_file_with_offset(FILE *fp, void *dst, u64 count, u64 offset);
Image *read_baseline_tiff(const char *file, const Allocator *allocator) {
Image *img_out = NULL;
if (!file) {
goto RETURN_IMG;
}
u64 name_length = strlen(file);
if (name_length < TIFF_FILENAME_MIN_LENGTH) {
goto RETURN_IMG;
}
const char *ext = NULL;
for (u32 i = name_length - 1; i >= name_length - TIFF_FILENAME_MIN_LENGTH;
--i) {
if (file[i] == '.') {
ext = &(file[i]);
break;
}
}
if (!ext || !IS_TIFF_EXTENSION(ext)) {
goto RETURN_IMG;
}
FILE *fp = fopen(file, "rb");
if (!fp) {
goto RETURN_IMG;
}
TiffHdr header = read_tiff_header(fp);
if (IS_NULL_HEADER(header)) {
goto FILE_CLEANUP;
}
Allocator alloc;
if (!allocator) {
alloc = wapp_mem_libc_allocator();
} else {
alloc = *allocator;
}
TiffIFD ifd = read_ifd(fp, &header, header.first_ifd_offset, &alloc);
read_fields(fp, &header, &ifd, &alloc);
FILE_CLEANUP:
fclose(fp);
RETURN_IMG:
return img_out;
}
TiffHdr read_tiff_header(FILE *fp) {
if (!fp) {
return NULL_TIFF_HEADER;
}
fseek(fp, 0, SEEK_SET);
TiffHdr header = NULL_TIFF_HEADER;
fread((void *)&header, sizeof(TiffHdr), 1, fp);
switch (header.order) {
case TIFF_ORDER_LITTLE_ENDIAN:
if (IS_BIG_ENDIAN) {
header.magic = htons(header.magic);
header.first_ifd_offset = htonl(header.first_ifd_offset);
}
break;
case TIFF_ORDER_BIG_ENDIAN:
if (IS_LITTLE_ENDIAN) {
header.magic = ntohs(header.magic);
header.first_ifd_offset = ntohl(header.first_ifd_offset);
}
break;
default:
return NULL_TIFF_HEADER;
}
if (header.magic != TIFF_MAGIC) {
return NULL_TIFF_HEADER;
}
return header;
}
TiffIFD read_ifd(FILE *fp, const TiffHdr *header, u32 offset,
const Allocator *allocator) {
if (!fp || !header) {
return NULL_TIFF_IFD;
}
fseek(fp, offset, SEEK_SET);
TiffIFD ifd = NULL_TIFF_IFD;
fread(&(ifd.count), sizeof(ifd.count), 1, fp);
switch (header->order) {
case TIFF_ORDER_LITTLE_ENDIAN:
if (IS_BIG_ENDIAN) {
ifd.count = htons(ifd.count);
}
break;
case TIFF_ORDER_BIG_ENDIAN:
if (IS_LITTLE_ENDIAN) {
ifd.count = ntohs(ifd.count);
}
break;
}
u64 field_byte_count = sizeof(TiffField) * ifd.count;
ifd.fields =
(TiffField *)wapp_mem_allocator_alloc(allocator, field_byte_count);
fread(ifd.fields, field_byte_count, 1, fp);
fread(&(ifd.next_ifd), sizeof(ifd.next_ifd), 1, fp);
return ifd;
}
Image *read_fields(FILE *fp, const TiffHdr *header, const TiffIFD *ifd,
const Allocator *allocator) {
if (!fp || !header || !ifd) {
return NULL;
}
u16 identifier = 0;
u16 photometric_interpretation = TIFF_PHOTOMETRIC_INTERPRETATION_INVALID;
u16 samples_per_pixel = 1;
u16 *bits_per_sample = NULL;
u32 strip_count = 1;
u8 *strip_offsets = NULL;
u16 strip_offsets_type = TIFF_FIELD_TYPE_LONG;
u8 *strip_byte_counts = NULL;
u16 strip_byte_counts_type = TIFF_FIELD_TYPE_LONG;
u64 width = 0;
u64 height = 0;
for (u64 i = 0; i < ifd->count; ++i) {
TiffField *field = &(ifd->fields[i]);
switch (header->order) {
case TIFF_ORDER_LITTLE_ENDIAN:
if (IS_BIG_ENDIAN) {
field->tag = htons(field->tag);
field->type = htons(field->type);
field->count = htonl(field->count);
field->value_offset = htonl(field->value_offset);
}
break;
case TIFF_ORDER_BIG_ENDIAN:
if (IS_LITTLE_ENDIAN) {
field->tag = ntohs(field->tag);
field->type = ntohs(field->type);
field->count = ntohl(field->count);
field->value_offset = ntohl(field->value_offset);
}
break;
}
switch (field->tag) {
case TIFF_PUBLIC_TAG_IMAGE_WIDTH:
if (field->count != 1) {
return NULL;
}
width = field->value_offset;
break;
case TIFF_PUBLIC_TAG_IMAGE_LENGTH:
if (field->count != 1) {
return NULL;
}
height = field->value_offset;
break;
case TIFF_PUBLIC_TAG_BITS_PER_SAMPLE:
identifier |= field->tag;
u64 byte_count = field->count * sizeof(u16);
bits_per_sample = wapp_mem_ctx_alloc(CTX_DEST_BUFFER_TEMP, byte_count);
if (!bits_per_sample) {
break;
}
if (byte_count <= 4) {
bits_per_sample = (u16 *)&(field->value_offset);
} else {
read_from_file_with_offset(fp, bits_per_sample, byte_count,
field->value_offset);
for (u64 i = 0; i < field->count; ++i) {
switch (header->order) {
case TIFF_ORDER_LITTLE_ENDIAN:
if (IS_BIG_ENDIAN) {
bits_per_sample[i] = htons(bits_per_sample[i]);
}
break;
case TIFF_ORDER_BIG_ENDIAN:
if (IS_LITTLE_ENDIAN) {
bits_per_sample[i] = ntohs(bits_per_sample[i]);
}
break;
}
}
}
break;
case TIFF_PUBLIC_TAG_COMPRESSION:
if (field->count != 1) {
return NULL;
}
switch (field->value_offset) {
case TIFF_COMPRESSION_UNCOMPRESSED:
break;
case TIFF_COMPRESSION_CCITT_1D:
case TIFF_COMPRESSION_GROUP_3_FAX:
case TIFF_COMPRESSION_GROUP_4_FAX:
case TIFF_COMPRESSION_LZW:
case TIFF_COMPRESSION_JPEG:
case TIFF_COMPRESSION_PACK_BITS:
return NULL;
}
break;
case TIFF_PUBLIC_TAG_PHOTOMETRIC_INTERPRETATION:
photometric_interpretation = field->value_offset;
break;
case TIFF_PUBLIC_TAG_STRIP_OFFSETS: {
strip_offsets_type = field->type;
u16 field_type_byte_count = field_types[strip_offsets_type].byte_count;
u32 total_byte_count = field->count * field_type_byte_count;
strip_count = field->count;
strip_offsets =
(u8 *)wapp_mem_ctx_alloc(CTX_DEST_BUFFER_TEMP, total_byte_count);
if (!strip_offsets) {
return NULL;
}
if (total_byte_count <= 4) {
memcpy(strip_offsets, &(field->value_offset), 4);
switch (header->order) {
case TIFF_ORDER_LITTLE_ENDIAN:
if (IS_BIG_ENDIAN) {
u32 val = htonl(*(u32 *)strip_offsets);
strip_offsets = (u8 *)&val;
}
break;
case TIFF_ORDER_BIG_ENDIAN:
if (IS_LITTLE_ENDIAN) {
u32 val = ntohl(*(u32 *)strip_offsets);
strip_offsets = (u8 *)&val;
}
break;
}
} else {
read_from_file_with_offset(fp, strip_offsets, total_byte_count,
field->value_offset);
}
break;
}
case TIFF_PUBLIC_TAG_SAMPLES_PER_PIXEL:
if (field->count != 1) {
return NULL;
}
identifier |= field->tag;
samples_per_pixel = field->value_offset;
break;
case TIFF_PUBLIC_TAG_ROWS_PER_STRIP:
if (field->count != 1 || height == 0) {
return NULL;
}
strip_count =
floor((f64)(height + field->value_offset - 1) / field->value_offset);
break;
case TIFF_PUBLIC_TAG_STRIP_BYTE_COUNTS: {
strip_byte_counts_type = field->type;
u16 field_type_byte_count = field_types[strip_offsets_type].byte_count;
u32 total_byte_count = field->count * field_type_byte_count;
strip_count = field->count;
strip_byte_counts =
(u8 *)wapp_mem_ctx_alloc(CTX_DEST_BUFFER_TEMP, total_byte_count);
if (!strip_byte_counts) {
return NULL;
}
if (total_byte_count <= 4) {
memcpy(strip_byte_counts, &(field->value_offset), 4);
switch (header->order) {
case TIFF_ORDER_LITTLE_ENDIAN:
if (IS_BIG_ENDIAN) {
u32 val = htonl(*(u32 *)strip_byte_counts);
strip_byte_counts = (u8 *)&val;
}
break;
case TIFF_ORDER_BIG_ENDIAN:
if (IS_LITTLE_ENDIAN) {
u32 val = ntohl(*(u32 *)strip_byte_counts);
strip_byte_counts = (u8 *)&val;
}
break;
}
} else {
read_from_file_with_offset(fp, strip_byte_counts, total_byte_count,
field->value_offset);
}
break;
}
case TIFF_PUBLIC_TAG_PLANAR_CONFIGURATION:
if (field->count != 1 ||
field->value_offset != TIFF_PLANAR_CONFIG_CHUNKY) {
return NULL;
}
break;
case TIFF_PUBLIC_TAG_COLOR_MAP:
identifier |= field->tag;
break;
default:
break;
}
}
if (identifier == tiff_image_identifiers[TIFF_IMAGE_BILEVEL]) {
printf("BILEVEL\n");
} else if (identifier == tiff_image_identifiers[TIFF_IMAGE_GRAYSCALE]) {
printf("GRAYSCALE\n");
} else if (identifier == tiff_image_identifiers[TIFF_IMAGE_PALETTE]) {
printf("PALETTE\n");
} else if (identifier == tiff_image_identifiers[TIFF_IMAGE_RGB]) {
printf("RGB\n");
} else {
printf("UNKNOWN\n");
}
printf("WIDTH: %lu, HEIGHT: %lu\n", width, height);
printf("SAMPLES: %u\n", samples_per_pixel);
printf("STRIPS: %u\n", strip_count);
printf("PHOTOMETRIC INTERPRETATION: %u\n", photometric_interpretation);
for (u64 i = 0; i < samples_per_pixel; ++i) {
printf("%u\n", bits_per_sample[i]);
}
printf("OFFSETS: ");
for (u64 i = 0; i < strip_count; ++i) {
if (strip_offsets_type == TIFF_FIELD_TYPE_LONG) {
printf("%u ", ((u32 *)strip_offsets)[i]);
} else {
printf("%u ", ((u16 *)strip_offsets)[i]);
}
}
printf("\n");
printf("COUNTS: ");
for (u64 i = 0; i < strip_count; ++i) {
if (strip_byte_counts_type == TIFF_FIELD_TYPE_LONG) {
printf("%u ", ((u32 *)strip_byte_counts)[i]);
} else {
printf("%u ", ((u16 *)strip_byte_counts)[i]);
}
}
printf("\n");
return NULL;
}
void read_from_file_with_offset(FILE *fp, void *dst, u64 count, u64 offset) {
if (!fp || !dst) {
return;
}
fseek(fp, offset, SEEK_SET);
fread(dst, count, 1, fp);
}

22
src/tiffread.h
View File

@@ -6,6 +6,7 @@ extern "C" {
#endif // __cplusplus
#include "aliases.h"
#include "image.h"
#define TAG_MAX_COUNT (UINT16_MAX * sizeof(const char *))
// Technically, the type parameter is 2-bytes long, but there aren't so many
@@ -13,7 +14,7 @@ extern "C" {
#define TYPE_MAX_COUNT (UINT8_MAX * sizeof(const char *))
// clang-format off
enum {
enum tiff_byte_order {
TIFF_ORDER_LITTLE_ENDIAN = 0x4949,
TIFF_ORDER_BIG_ENDIAN = 0x4d4d,
};
@@ -31,7 +32,7 @@ enum tiff_public_tags {
#include "tiff_public_tags.inc"
};
const char *tag_names[TAG_MAX_COUNT] = {
internal const char *tag_names[TAG_MAX_COUNT] = {
#define TIFF_TAG_LOOKUP
#include "tiff_public_tags.inc"
#undef TIFF_TAG_LOOKUP
@@ -43,11 +44,11 @@ enum tiff_field_types {
typedef struct field_type TiffFieldType;
struct field_type {
const char *name;
u16 byte_count;
const char *name;
u16 byte_count;
};
TiffFieldType filed_types[TYPE_MAX_COUNT] = {
internal TiffFieldType field_types[TYPE_MAX_COUNT] = {
#define TIFF_TYPE_LOOKUP
#include "tiff_field_types.inc"
#undef TIFF_TYPE_LOOKUP
@@ -79,9 +80,7 @@ enum tiff_compression {
TIFF_COMPRESSION_JPEG = 0x0006,
TIFF_COMPRESSION_PACK_BITS = 0x8005,
};
// clang-format on
// clang-format off
enum tiff_photometric_interpretation {
TIFF_PHOTOMETRIC_INTERPRETATION_WHITE_IS_ZERO = 0x0000,
TIFF_PHOTOMETRIC_INTERPRETATION_BLACK_IS_ZERO = 0x0001,
@@ -91,9 +90,18 @@ enum tiff_photometric_interpretation {
TIFF_PHOTOMETRIC_INTERPRETATION_CMYK = 0x0005,
TIFF_PHOTOMETRIC_INTERPRETATION_YCbCr = 0x0006,
TIFF_PHOTOMETRIC_INTERPRETATION_CIELab = 0x0008,
TIFF_PHOTOMETRIC_INTERPRETATION_INVALID,
};
enum tiff_planar_configuration {
TIFF_PLANAR_CONFIG_CHUNKY = 0x0001,
TIFF_PLANAR_CONFIG_PLANAR = 0x0002,
};
// clang-format on
Image *read_baseline_tiff(const char *file, const Allocator *allocator);
#ifdef __cplusplus
}
#endif // __cplusplus