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Code Editor : jpegsize
#!/usr/bin/env slsh % This script prints the width and height of one or more jpeg image files. if (__argc < 2) { () = fprintf (stderr, "Usage: %s files....\n", path_basename (__argv[0])); exit (1); } private variable M_SOF0 = 0xC0; %/* Start Of Frame N */ private variable M_SOF1 = 0xC1; %/* N indicates which compression process */ private variable M_SOF2 = 0xC2; %/* Only SOF0-SOF2 are now in common use */ private variable M_SOF3 = 0xC3; % private variable M_SOF5 = 0xC5; %/* NB: codes C4 and CC are NOT SOF markers */ private variable M_SOF6 = 0xC6; % private variable M_SOF7 = 0xC7; % private variable M_SOF9 = 0xC9; % private variable M_SOF10 = 0xCA; % private variable M_SOF11 = 0xCB; % private variable M_SOF13 = 0xCD; % private variable M_SOF14 = 0xCE; % private variable M_SOF15 = 0xCF; % private variable M_SOI = 0xD8; %/* Start Of Image (beginning of datastream) */ private variable M_EOI = 0xD9; %/* End Of Image (end of datastream) */ private variable M_SOI = 0xD8; % Start Of Image (beginning of datastream) private define read_nbytes (fp, n) { variable b; if (n != fread_bytes (&b, n, fp)) throw ReadError, "Failed to read $n bytes"$; return b; } private define read_ushort (fp) { return unpack (">H", read_nbytes (fp, 2)); } private define open_jpg_file_for_read (file) { variable fp = fopen (file, "rb"); variable b = read_nbytes (fp, 2); if ((b[0] != 0xFF) or (b[1] != M_SOI)) return NULL; return fp; } private define next_marker (fp) { variable c = read_nbytes (fp, 1); while (c != 0xFF) c = read_nbytes (fp, 1); % Remove pad bytes do c = read_nbytes (fp, 1); while (c == 0xFF); return c; } private define skip_variable (fp) { variable len = read_ushort (fp); if (len < 2) throw DataError, "Erroneous JPEG marker length"; len -= 2; while (len > 512) { () = read_nbytes (fp, 512); len -= 512; } () = read_nbytes (fp, len); } public define jpeg_size (file, width, height) { variable fp = open_jpg_file_for_read (file); if (fp == NULL) return -1; variable is_sof = UChar_Type[256]; is_sof[M_SOF0] = 1; is_sof[M_SOF1] = 1; is_sof[M_SOF2] = 1; is_sof[M_SOF3] = 1; is_sof[M_SOF5] = 1; is_sof[M_SOF6] = 1; is_sof[M_SOF7] = 1; is_sof[M_SOF9] = 1; is_sof[M_SOF10] = 1; is_sof[M_SOF11] = 1; is_sof[M_SOF13] = 1; is_sof[M_SOF15] = 1; while (0 == is_sof[next_marker(fp)]) { skip_variable (fp); } variable len = read_ushort (fp); variable data_precision = read_nbytes (fp, 1); variable h = read_ushort (fp); variable w = read_ushort (fp); @width = w; @height = h; return 0; } private define main () { variable file; foreach file (__argv[[1:]]) { try { variable width, height; if (-1 == jpeg_size (file, &width, &height)) { () = fprintf (stderr, "%s is not a jpeg file\n", file); continue; } () = fprintf (stdout, "%s: %ux%u\n", file, width, height); } catch ReadError, DataError: () = fprintf (stderr, "Caught error processing %s ...skipped\n", file); } exit (0); } main ();
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