Spencer/PNG_CC
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2021-10-14 01:27:38 -04:00
parent 7534150326
commit 6166af2b41
4 changed files with 104 additions and 9 deletions
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32
include/crc_util.h
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@@ -1,15 +1,29 @@
#include <stdio.h>
// PNG File Struct
struct PNG_FILE_STRUCT {
struct PNG_START_FILE_STRUCT {
unsigned char file_sig[8];
int file_width;
int file_height;
int bit_depth;
int color_type;
int compression_method;
int filter_method;
int interlace_method;
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 {
unsigned char idat_length[4];
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;
};
extern const long png_signature[8];
@@ -18,3 +32,5 @@ 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);