/* This function takes in the file, reads the header, utilizes * functions in compute40 module to perform the decompress, completes the * decompressed ppm, and calls ppmwrite() to write the image to the * stdout */ void decompress40(FILE *input) { unsigned height, width; int read = fscanf(input, "COMP40 Compressed image format 2\n%u %u", &width, &height); assert(read == 2); int c = getc(input); assert(c == '\n'); A2Methods_T methods = uarray2_methods_blocked; A2 array = methods->new_with_blocksize(width / 2, height / 2, sizeof(uint64_t), 1); assert(array); A2 result = methods->new_with_blocksize(width, height, sizeof(struct Pnm_rgb), 2); assert(result); methods->map_block_major(array, read_compressed, input); methods->map_block_major(array, decompress, result); assert(result); struct Pnm_ppm pixmap = { .width = width, .height = height, .denominator = DENOMINATOR, .pixels = result, .methods = uarray2_methods_blocked}; Pnm_ppmwrite(stdout, &pixmap); methods->free(&result); methods->free(&array); }
/* This function takes in the file and utilizes functions in compute40 * module to perform the compression and outputing, and frees the memory */ void compress40(FILE *input) { A2Methods_T methods = uarray2_methods_blocked; Pnm_ppm image = Pnm_ppmread(input, methods); assert(image); assert(image->width > 1 && image->height > 1); image->pixels = image_trimmer(image); A2 result = methods->new_with_blocksize(image->width / BLOCKSIZE, image->height / BLOCKSIZE, sizeof(uint64_t), 1); methods->map_block_major(result, compress, image); assert(result); print_result(result, methods); methods->free(&result); FREE(result); Pnm_ppmfree(&image); }