Spencer/PNG_CC
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2021-10-16 00:38:10 -04:00
parent 184fc5fac4
commit 677c34d367
1 changed files with 2 additions and 8 deletions
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10
cmd/crc.c
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@@ -68,8 +68,6 @@ void random_data_change(unsigned char *color_data, int width, int length) {
int color_range = 3;
unsigned char temp_color_data[length];
//memcpy(temp_color_data, color_data, length);
do {
rounds++;
// Creating temporary data set
@@ -120,7 +118,7 @@ void build_png_file(struct PNG_FILE_STRUCT *png_file, char *out_file_name) {
start_data.png_data = png_file->png_start_data;
// IHDR Data
for(int i = 0; i < sizeof(struct PNG_START_FILE_STRUCT); i++) {
for(int i = 0; i < sizeof(start_data.data); i++) {
fputc(start_data.data[i], fp);
}
// IDAT Data
@@ -149,13 +147,11 @@ void build_png_file(struct PNG_FILE_STRUCT *png_file, char *out_file_name) {
new_crc[i] = int_crc >> (8*(3-i)) & 0xFF;
fputc(new_crc[i], fp);
}
// IEND Data
unsigned char IEND_DATA[12] = { 0x00, 0x00, 0x00, 0x00, 0x49, 0x45, 0x4E, 0x44, 0xAE, 0x42, 0x60, 0x82};
for(int i = 0; i < 12; i++) {
fputc(IEND_DATA[i], fp);
}
fclose(fp);
}
@@ -204,8 +200,7 @@ int change_idat_content(unsigned char *addr, struct PNG_FILE_STRUCT *png_file, c
png_file->png_idat_data.idat_data = calloc(com_data_size, sizeof(unsigned char));
// TEMP FIX FOR IDAT SIZE ISSUES
png_file->png_idat_data.idat_length[3] = (unsigned char)com_data_size;
png_file->png_idat_data.idat_data_length = be32toh(com_data_size);
for(size_t i = 0; i < com_data_size; i++) {
png_file->png_idat_data.idat_data[i] = com_data_buff[i];
@@ -298,7 +293,6 @@ int main(int argc, char **argv) {
populate_start_png(file_data, &png_file_data.png_start_data);
offset = first_idat(file_data);
printf("Off: %ld\n", offset);
populate_idat_png(file_data, &png_file_data.png_idat_data, offset);