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Initial PNG CC Implementation

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Signed-off-by: Pin <wf6DJd8a3xSSCZbn@protonmail.com>
This commit is contained in:
Pin
2021-09-21 01:15:03 -04:00
parent fafe5a4520
commit c86b56286c
9 changed files with 668 additions and 0 deletions
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43
include/crc_util.h Normal file
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#include <stdio.h>
#include <stdint.h>
#pragma once
// PNG File Struct
struct PNG_START_FILE_STRUCT {
unsigned char file_sig[8];
unsigned char ihdr_length[4];
unsigned char ihdr_header[4];
unsigned char file_width[4];
unsigned char file_height[4];
unsigned char bit_depth[1];
unsigned char color_type[1];
unsigned char compression_method[1];
unsigned char filter_method[1];
unsigned char interlace_method[1];
unsigned char ihdr_crc[4];
};
struct PNG_IDAT_FILE_STRUCT {
union{
unsigned char idat_length[4];
uint32_t idat_data_length;
};
unsigned char idat_header[4];
unsigned char idat_crc[4];
unsigned char *idat_data;
};
struct PNG_FILE_STRUCT {
struct PNG_START_FILE_STRUCT png_start_data;
struct PNG_IDAT_FILE_STRUCT png_idat_data;
};
extern const long png_signature[8];
int check_header_length(unsigned char *addr, long offset);
int check_file_header(char *addr);
int create_cc_file(unsigned char *addr, unsigned long file_length);
unsigned char* file_to_char_array(FILE *in_file, size_t* size);
void populate_start_png(unsigned char *addr, struct PNG_START_FILE_STRUCT *png_data);
void populate_idat_png(unsigned char *addr, struct PNG_IDAT_FILE_STRUCT *png_data, unsigned long offset);