/* * ImageInfo.java * * Version 1.7 * * A Java class to determine image width, height and color depth for a number of image file formats. * * Written by Marco Schmidt * * Contributed to the Public Domain. */ import java.io.DataInput; import java.io.FileInputStream; import java.io.InputStream; import java.io.IOException; import java.net.URL; import java.util.Vector; /** * Get file format, image resolution, number of bits per pixel and optionally * number of images, comments and physical resolution from * JPEG, GIF, BMP, PCX, PNG, IFF, RAS, PBM, PGM, PPM and PSD files (or input streams). *

* Use the class like this: * 

 * ImageInfo ii = new ImageInfo();
 * ii.setInput(in); // in can be InputStream or RandomAccessFile
 * ii.setDetermineImageNumber(true); // default is false
 * ii.setCollectComments(true); // default is false
 * if (!ii.check()) {
 *   System.err.println("Not a supported image file format.");
 *   return;
 * }
 * System.out.println(ii.getFormatName() + ", " + ii.getMimeType() + 
 *   ", " + ii.getWidth() + " x " + ii.getHeight() + " pixels, " + 
 *   ii.getBitsPerPixel() + " bits per pixel, " + ii.getNumberOfImages() +
 *   " image(s), " + ii.getNumberOfComments() + " comment(s).");
 *  // there are other properties, check out the API documentation
 *
* You can also use this class as a command line program. * Call it with a number of image file names and URLs as parameters: * 
 *   java ImageInfo *.jpg *.png *.gif http://somesite.tld/image.jpg
 *
* or call it without parameters and pipe data to it: * 
 *   java ImageInfo < image.jpg  
 *
*

* Known limitations: *

*

* Requirements: *

*

* The latest version can be found at http://schmidt.devlib.org/image-info/. *

* Written by Marco Schmidt. *

* This class is contributed to the Public Domain. * Use it at your own risk. *

* Last modification 2005-07-26. *

* History: *

* @author Marco Schmidt */ public class ImageInfo { /** * Return value of {@link #getFormat()} for JPEG streams. * ImageInfo can extract physical resolution and comments * from JPEGs (only from APP0 headers). * Only one image can be stored in a file. * It is determined whether the JPEG stream is progressive * (see {@link #isProgressive()}). */ public static final int FORMAT_JPEG = 0; /** * Return value of {@link #getFormat()} for GIF streams. * ImageInfo can extract comments from GIFs and count the number * of images (GIFs with more than one image are animations). * It is determined whether the GIF stream is interlaced (see {@link #isProgressive()}). */ public static final int FORMAT_GIF = 1; /** * Return value of {@link #getFormat()} for PNG streams. * PNG only supports one image per file. * Both physical resolution and comments can be stored with PNG, * but ImageInfo is currently not able to extract those. * It is determined whether the PNG stream is interlaced (see {@link #isProgressive()}). */ public static final int FORMAT_PNG = 2; /** * Return value of {@link #getFormat()} for BMP streams. * BMP only supports one image per file. * BMP does not allow for comments. * The physical resolution can be stored. */ public static final int FORMAT_BMP = 3; /** * Return value of {@link #getFormat()} for PCX streams. * PCX does not allow for comments or more than one image per file. * However, the physical resolution can be stored. */ public static final int FORMAT_PCX = 4; /** * Return value of {@link #getFormat()} for IFF streams. */ public static final int FORMAT_IFF = 5; /** * Return value of {@link #getFormat()} for RAS streams. * Sun Raster allows for one image per file only and is not able to * store physical resolution or comments. */ public static final int FORMAT_RAS = 6; /** Return value of {@link #getFormat()} for PBM streams. */ public static final int FORMAT_PBM = 7; /** Return value of {@link #getFormat()} for PGM streams. */ public static final int FORMAT_PGM = 8; /** Return value of {@link #getFormat()} for PPM streams. */ public static final int FORMAT_PPM = 9; /** Return value of {@link #getFormat()} for PSD streams. */ public static final int FORMAT_PSD = 10; /* public static final int COLOR_TYPE_UNKNOWN = -1; public static final int COLOR_TYPE_TRUECOLOR_RGB = 0; public static final int COLOR_TYPE_PALETTED = 1; public static final int COLOR_TYPE_GRAYSCALE= 2; public static final int COLOR_TYPE_BLACK_AND_WHITE = 3;*/ /** * The names of all supported file formats. * The FORMAT_xyz int constants can be used as index values for this array. */ private static final String[] FORMAT_NAMES = {"JPEG", "GIF", "PNG", "BMP", "PCX", "IFF", "RAS", "PBM", "PGM", "PPM", "PSD"}; /** * The names of the MIME types for all supported file formats. * The FORMAT_xyz int constants can be used as index values for this array. */ private static final String[] MIME_TYPE_STRINGS = {"image/jpeg", "image/gif", "image/png", "image/bmp", "image/pcx", "image/iff", "image/ras", "image/x-portable-bitmap", "image/x-portable-graymap", "image/x-portable-pixmap", "image/psd"}; private int width; private int height; private int bitsPerPixel; //private int colorType = COLOR_TYPE_UNKNOWN; private boolean progressive; private int format; private InputStream in; private DataInput din; private boolean collectComments = true; private Vector comments; private boolean determineNumberOfImages; private int numberOfImages; private int physicalHeightDpi; private int physicalWidthDpi; private int bitBuf; private int bitPos; private void addComment(String s) { if (comments == null) { comments = new Vector(); } comments.addElement(s); } /** * Call this method after you have provided an input stream or file * using {@link #setInput(InputStream)} or {@link #setInput(DataInput)}. * If true is returned, the file format was known and information * on the file's content can be retrieved using the various getXyz methods. * @return if information could be retrieved from input */ public boolean check() { format = -1; width = -1; height = -1; bitsPerPixel = -1; numberOfImages = 1; physicalHeightDpi = -1; physicalWidthDpi = -1; comments = null; try { int b1 = read() & 0xff; int b2 = read() & 0xff; if (b1 == 0x47 && b2 == 0x49) { return checkGif(); } else if (b1 == 0x89 && b2 == 0x50) { return checkPng(); } else if (b1 == 0xff && b2 == 0xd8) { return checkJpeg(); } else if (b1 == 0x42 && b2 == 0x4d) { return checkBmp(); } else if (b1 == 0x0a && b2 < 0x06) { return checkPcx(); } else if (b1 == 0x46 && b2 == 0x4f) { return checkIff(); } else if (b1 == 0x59 && b2 == 0xa6) { return checkRas(); } else if (b1 == 0x50 && b2 >= 0x31 && b2 <= 0x36) { return checkPnm(b2 - '0'); } else if (b1 == 0x38 && b2 == 0x42) { return checkPsd(); } else { return false; } } catch (IOException ioe) { return false; } } private boolean checkBmp() throws IOException { byte[] a = new byte[44]; if (read(a) != a.length) { return false; } width = getIntLittleEndian(a, 16); height = getIntLittleEndian(a, 20); if (width < 1 || height < 1) { return false; } bitsPerPixel = getShortLittleEndian(a, 26); if (bitsPerPixel != 1 && bitsPerPixel != 4 && bitsPerPixel != 8 && bitsPerPixel != 16 && bitsPerPixel != 24 && bitsPerPixel != 32) { return false; } int x = (int)(getIntLittleEndian(a, 36) * 0.0254); if (x > 0) { setPhysicalWidthDpi(x); } int y = (int)(getIntLittleEndian(a, 40) * 0.0254); if (y > 0) { setPhysicalHeightDpi(y); } format = FORMAT_BMP; return true; } private boolean checkGif() throws IOException { final byte[] GIF_MAGIC_87A = {0x46, 0x38, 0x37, 0x61}; final byte[] GIF_MAGIC_89A = {0x46, 0x38, 0x39, 0x61}; byte[] a = new byte[11]; // 4 from the GIF signature + 7 from the global header if (read(a) != 11) { return false; } if ((!equals(a, 0, GIF_MAGIC_89A, 0, 4)) && (!equals(a, 0, GIF_MAGIC_87A, 0, 4))) { return false; } format = FORMAT_GIF; width = getShortLittleEndian(a, 4); height = getShortLittleEndian(a, 6); int flags = a[8] & 0xff; bitsPerPixel = ((flags >> 4) & 0x07) + 1; //progressive = (flags & 0x02) != 0; if (!determineNumberOfImages) { return true; } // skip global color palette if ((flags & 0x80) != 0) { int tableSize = (1 << ((flags & 7) + 1)) * 3; skip(tableSize); } numberOfImages = 0; int blockType; do { blockType = read(); switch(blockType) { case(0x2c): // image separator { if (read(a, 0, 9) != 9) { return false; } flags = a[8] & 0xff; progressive = (flags & 0x40) != 0; /*int locWidth = getShortLittleEndian(a, 4); int locHeight = getShortLittleEndian(a, 6); System.out.println("LOCAL: " + locWidth + " x " + locHeight);*/ int localBitsPerPixel = (flags & 0x07) + 1; if (localBitsPerPixel > bitsPerPixel) { bitsPerPixel = localBitsPerPixel; } if ((flags & 0x80) != 0) { skip((1 << localBitsPerPixel) * 3); } skip(1); // initial code length int n; do { n = read(); if (n > 0) { skip(n); } else if (n == -1) { return false; } } while (n > 0); numberOfImages++; break; } case(0x21): // extension { int extensionType = read(); if (collectComments && extensionType == 0xfe) { StringBuffer sb = new StringBuffer(); int n; do { n = read(); if (n == -1) { return false; } if (n > 0) { for (int i = 0; i < n; i++) { int ch = read(); if (ch == -1) { return false; } sb.append((char)ch); } } } while (n > 0); } else { int n; do { n = read(); if (n > 0) { skip(n); } else if (n == -1) { return false; } } while (n > 0); } break; } case(0x3b): // end of file { break; } default: { return false; } } } while (blockType != 0x3b); return true; } private boolean checkIff() throws IOException { byte[] a = new byte[10]; // read remaining 2 bytes of file id, 4 bytes file size and 4 bytes IFF subformat if (read(a, 0, 10) != 10) { return false; } final byte[] IFF_RM = {0x52, 0x4d}; if (!equals(a, 0, IFF_RM, 0, 2)) { return false; } int type = getIntBigEndian(a, 6); if (type != 0x494c424d && // type must be ILBM... type != 0x50424d20) { // ...or PBM return false; } // loop chunks to find BMHD chunk do { if (read(a, 0, 8) != 8) { return false; } int chunkId = getIntBigEndian(a, 0); int size = getIntBigEndian(a, 4); if ((size & 1) == 1) { size++; } if (chunkId == 0x424d4844) { // BMHD chunk if (read(a, 0, 9) != 9) { return false; } format = FORMAT_IFF; width = getShortBigEndian(a, 0); height = getShortBigEndian(a, 2); bitsPerPixel = a[8] & 0xff; return (width > 0 && height > 0 && bitsPerPixel > 0 && bitsPerPixel < 33); } else { skip(size); } } while (true); } private boolean checkJpeg() throws IOException { byte[] data = new byte[12]; while (true) { if (read(data, 0, 4) != 4) { return false; } int marker = getShortBigEndian(data, 0); int size = getShortBigEndian(data, 2); if ((marker & 0xff00) != 0xff00) { return false; // not a valid marker } if (marker == 0xffe0) { // APPx if (size < 14) { return false; // APPx header must be >= 14 bytes } if (read(data, 0, 12) != 12) { return false; } final byte[] APP0_ID = {0x4a, 0x46, 0x49, 0x46, 0x00}; if (equals(APP0_ID, 0, data, 0, 5)) { //System.out.println("data 7=" + data[7]); if (data[7] == 1) { setPhysicalWidthDpi(getShortBigEndian(data, 8)); setPhysicalHeightDpi(getShortBigEndian(data, 10)); } else if (data[7] == 2) { int x = getShortBigEndian(data, 8); int y = getShortBigEndian(data, 10); setPhysicalWidthDpi((int)(x * 2.54f)); setPhysicalHeightDpi((int)(y * 2.54f)); } } skip(size - 14); } else if (collectComments && size > 2 && marker == 0xfffe) { // comment size -= 2; byte[] chars = new byte[size]; if (read(chars, 0, size) != size) { return false; } String comment = new String(chars, "iso-8859-1"); comment = comment.trim(); addComment(comment); } else if (marker >= 0xffc0 && marker <= 0xffcf && marker != 0xffc4 && marker != 0xffc8) { if (read(data, 0, 6) != 6) { return false; } format = FORMAT_JPEG; bitsPerPixel = (data[0] & 0xff) * (data[5] & 0xff); progressive = marker == 0xffc2 || marker == 0xffc6 || marker == 0xffca || marker == 0xffce; width = getShortBigEndian(data, 3); height = getShortBigEndian(data, 1); return true; } else { skip(size - 2); } } } private boolean checkPcx() throws IOException { byte[] a = new byte[64]; if (read(a) != a.length) { return false; } if (a[0] != 1) { // encoding, 1=RLE is only valid value return false; } // width / height int x1 = getShortLittleEndian(a, 2); int y1 = getShortLittleEndian(a, 4); int x2 = getShortLittleEndian(a, 6); int y2 = getShortLittleEndian(a, 8); if (x1 < 0 || x2 < x1 || y1 < 0 || y2 < y1) { return false; } width = x2 - x1 + 1; height = y2 - y1 + 1; // color depth int bits = a[1]; int planes = a[63]; if (planes == 1 && (bits == 1 || bits == 2 || bits == 4 || bits == 8)) { // paletted bitsPerPixel = bits; } else if (planes == 3 && bits == 8) { // RGB truecolor bitsPerPixel = 24; } else { return false; } setPhysicalWidthDpi(getShortLittleEndian(a, 10)); setPhysicalHeightDpi(getShortLittleEndian(a, 10)); format = FORMAT_PCX; return true; } private boolean checkPng() throws IOException { final byte[] PNG_MAGIC = {0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a}; byte[] a = new byte[27]; if (read(a) != 27) { return false; } if (!equals(a, 0, PNG_MAGIC, 0, 6)) { return false; } format = FORMAT_PNG; width = getIntBigEndian(a, 14); height = getIntBigEndian(a, 18); bitsPerPixel = a[22] & 0xff; int colorType = a[23] & 0xff; if (colorType == 2 || colorType == 6) { bitsPerPixel *= 3; } progressive = (a[26] & 0xff) != 0; return true; } private boolean checkPnm(int id) throws IOException { if (id < 1 || id > 6) { return false; } final int[] PNM_FORMATS = {FORMAT_PBM, FORMAT_PGM, FORMAT_PPM}; format = PNM_FORMATS[(id - 1) % 3]; boolean hasPixelResolution = false; String s; while (true) { s = readLine(); if (s != null) { s = s.trim(); } if (s == null || s.length() < 1) { continue; } if (s.charAt(0) == '#') { // comment if (collectComments && s.length() > 1) { addComment(s.substring(1)); } continue; } if (!hasPixelResolution) { // split "343 966" into width=343, height=966 int spaceIndex = s.indexOf(' '); if (spaceIndex == -1) { return false; } String widthString = s.substring(0, spaceIndex); spaceIndex = s.lastIndexOf(' '); if (spaceIndex == -1) { return false; } String heightString = s.substring(spaceIndex + 1); try { width = Integer.parseInt(widthString); height = Integer.parseInt(heightString); } catch (NumberFormatException nfe) { return false; } if (width < 1 || height < 1) { return false; } if (format == FORMAT_PBM) { bitsPerPixel = 1; return true; } hasPixelResolution = true; } else { int maxSample; try { maxSample = Integer.parseInt(s); } catch (NumberFormatException nfe) { return false; } if (maxSample < 0) { return false; } for (int i = 0; i < 25; i++) { if (maxSample < (1 << (i + 1))) { bitsPerPixel = i + 1; if (format == FORMAT_PPM) { bitsPerPixel *= 3; } return true; } } return false; } } } private boolean checkPsd() throws IOException { byte[] a = new byte[24]; if (read(a) != a.length) { return false; } final byte[] PSD_MAGIC = {0x50, 0x53}; if (!equals(a, 0, PSD_MAGIC, 0, 2)) { return false; } format = FORMAT_PSD; width = getIntBigEndian(a, 16); height = getIntBigEndian(a, 12); int channels = getShortBigEndian(a, 10); int depth = getShortBigEndian(a, 20); bitsPerPixel = channels * depth; return (width > 0 && height > 0 && bitsPerPixel > 0 && bitsPerPixel <= 64); } private boolean checkRas() throws IOException { byte[] a = new byte[14]; if (read(a) != a.length) { return false; } final byte[] RAS_MAGIC = {0x6a, (byte)0x95}; if (!equals(a, 0, RAS_MAGIC, 0, 2)) { return false; } format = FORMAT_RAS; width = getIntBigEndian(a, 2); height = getIntBigEndian(a, 6); bitsPerPixel = getIntBigEndian(a, 10); return (width > 0 && height > 0 && bitsPerPixel > 0 && bitsPerPixel <= 24); } /** * Run over String list, return false iff at least one of the arguments equals -c. * @param args string list to check */ private static boolean determineVerbosity(String[] args) { if (args != null && args.length > 0) { for (int i = 0; i < args.length; i++) { if ("-c".equals(args[i])) { return false; } } } return true; } private static boolean equals(byte[] a1, int offs1, byte[] a2, int offs2, int num) { while (num-- > 0) { if (a1[offs1++] != a2[offs2++]) { return false; } } return true; } /** * If {@link #check()} was successful, returns the image's number of bits per pixel. * Does not include transparency information like the alpha channel. * @return number of bits per image pixel */ public int getBitsPerPixel() { return bitsPerPixel; } /** * Returns the index'th comment retrieved from the file. * @param index int index of comment to return * @throws IllegalArgumentException if index is smaller than 0 or larger than or equal * to the number of comments retrieved * @see #getNumberOfComments */ public String getComment(int index) { if (comments == null || index < 0 || index >= comments.size()) { throw new IllegalArgumentException("Not a valid comment index: " + index); } return (String)comments.elementAt(index); } /** * If {@link #check()} was successful, returns the image format as one * of the FORMAT_xyz constants from this class. * Use {@link #getFormatName()} to get a textual description of the file format. * @return file format as a FORMAT_xyz constant */ public int getFormat() { return format; } /** * If {@link #check()} was successful, returns the image format's name. * Use {@link #getFormat()} to get a unique number. * @return file format name */ public String getFormatName() { if (format >= 0 && format < FORMAT_NAMES.length) { return FORMAT_NAMES[format]; } else { return "?"; } } /** * If {@link #check()} was successful, returns one the image's vertical resolution in pixels. * @return image height in pixels */ public int getHeight() { return height; } private static int getIntBigEndian(byte[] a, int offs) { return (a[offs] & 0xff) << 24 | (a[offs + 1] & 0xff) << 16 | (a[offs + 2] & 0xff) << 8 | a[offs + 3] & 0xff; } private static int getIntLittleEndian(byte[] a, int offs) { return (a[offs + 3] & 0xff) << 24 | (a[offs + 2] & 0xff) << 16 | (a[offs + 1] & 0xff) << 8 | a[offs] & 0xff; } /** * If {@link #check()} was successful, returns a String with the MIME type of the format. * @return MIME type, e.g. image/jpeg */ public String getMimeType() { if (format >= 0 && format < MIME_TYPE_STRINGS.length) { if (format == FORMAT_JPEG && progressive) { return "image/pjpeg"; } return MIME_TYPE_STRINGS[format]; } else { return null; } } /** * If {@link #check()} was successful and {@link #setCollectComments(boolean)} was called with * true as argument, returns the number of comments retrieved * from the input image stream / file. * Any number >= 0 and smaller than this number of comments is then a * valid argument for the {@link #getComment(int)} method. * @return number of comments retrieved from input image */ public int getNumberOfComments() { if (comments == null) { return 0; } else { return comments.size(); } } /** * Returns the number of images in the examined file. * Assumes that setDetermineImageNumber(true); was called before * a successful call to {@link #check()}. * This value can currently be only different from 1 for GIF images. * @return number of images in file */ public int getNumberOfImages() { return numberOfImages; } /** * Returns the physical height of this image in dots per inch (dpi). * Assumes that {@link #check()} was successful. * Returns -1 on failure. * @return physical height (in dpi) * @see #getPhysicalWidthDpi() * @see #getPhysicalHeightInch() */ public int getPhysicalHeightDpi() { return physicalHeightDpi; } /** * If {@link #check()} was successful, returns the physical width of this image in dpi (dots per inch) * or -1 if no value could be found. * @return physical height (in dpi) * @see #getPhysicalHeightDpi() * @see #getPhysicalWidthDpi() * @see #getPhysicalWidthInch() */ public float getPhysicalHeightInch() { int h = getHeight(); int ph = getPhysicalHeightDpi(); if (h > 0 && ph > 0) { return ((float)h) / ((float)ph); } else { return -1.0f; } } /** * If {@link #check()} was successful, returns the physical width of this image in dpi (dots per inch) * or -1 if no value could be found. * @return physical width (in dpi) * @see #getPhysicalHeightDpi() * @see #getPhysicalWidthInch() * @see #getPhysicalHeightInch() */ public int getPhysicalWidthDpi() { return physicalWidthDpi; } /** * Returns the physical width of an image in inches, or * -1.0f if width information is not available. * Assumes that {@link #check} has been called successfully. * @return physical width in inches or -1.0f on failure * @see #getPhysicalWidthDpi * @see #getPhysicalHeightInch */ public float getPhysicalWidthInch() { int w = getWidth(); int pw = getPhysicalWidthDpi(); if (w > 0 && pw > 0) { return ((float)w) / ((float)pw); } else { return -1.0f; } } private static int getShortBigEndian(byte[] a, int offs) { return (a[offs] & 0xff) << 8 | (a[offs + 1] & 0xff); } private static int getShortLittleEndian(byte[] a, int offs) { return (a[offs] & 0xff) | (a[offs + 1] & 0xff) << 8; } /** * If {@link #check()} was successful, returns one the image's horizontal resolution in pixels. * @return image width in pixels */ public int getWidth() { return width; } /** * Returns whether the image is stored in a progressive (also called: interlaced) way. * @return true for progressive/interlaced, false otherwise */ public boolean isProgressive() { return progressive; } /** * To use this class as a command line application, give it either * some file names as parameters (information on them will be * printed to standard output, one line per file) or call * it with no parameters. It will then check data given to it via standard input. * @param args the program arguments which must be file names */ public static void main(String[] args) { ImageInfo imageInfo = new ImageInfo(); imageInfo.setDetermineImageNumber(true); boolean verbose = determineVerbosity(args); if (args.length == 0) { run(null, System.in, imageInfo, verbose); } else { int index = 0; while (index < args.length) { InputStream in = null; try { String name = args[index++]; System.out.print(name + ";"); if (name.startsWith("http://")) { in = new URL(name).openConnection().getInputStream(); } else { in = new FileInputStream(name); } run(name, in, imageInfo, verbose); in.close(); } catch (IOException e) { System.out.println(e); try { in.close(); } catch (IOException ee) { } } } } } private static void print(String sourceName, ImageInfo ii, boolean verbose) { if (verbose) { printVerbose(sourceName, ii); } else { printCompact(sourceName, ii); } } private static void printCompact(String sourceName, ImageInfo imageInfo) { final String SEP = "\t"; System.out.println( sourceName + SEP + imageInfo.getFormatName() + SEP + imageInfo.getMimeType() + SEP + imageInfo.getWidth() + SEP + imageInfo.getHeight() + SEP + imageInfo.getBitsPerPixel() + SEP + imageInfo.getNumberOfImages() + SEP + imageInfo.getPhysicalWidthDpi() + SEP + imageInfo.getPhysicalHeightDpi() + SEP + imageInfo.getPhysicalWidthInch() + SEP + imageInfo.getPhysicalHeightInch() + SEP + imageInfo.isProgressive() ); } private static void printLine(int indentLevels, String text, float value, float minValidValue) { if (value < minValidValue) { return; } printLine(indentLevels, text, Float.toString(value)); } private static void printLine(int indentLevels, String text, int value, int minValidValue) { if (value >= minValidValue) { printLine(indentLevels, text, Integer.toString(value)); } } private static void printLine(int indentLevels, String text, String value) { if (value == null || value.length() == 0) { return; } while (indentLevels-- > 0) { System.out.print("\t"); } if (text != null && text.length() > 0) { System.out.print(text); System.out.print(" "); } System.out.println(value); } private static void printVerbose(String sourceName, ImageInfo ii) { printLine(0, null, sourceName); printLine(1, "File format: ", ii.getFormatName()); printLine(1, "MIME type: ", ii.getMimeType()); printLine(1, "Width (pixels): ", ii.getWidth(), 1); printLine(1, "Height (pixels): ", ii.getHeight(), 1); printLine(1, "Bits per pixel: ", ii.getBitsPerPixel(), 1); printLine(1, "Progressive: ", ii.isProgressive() ? "yes" : "no"); printLine(1, "Number of images: ", ii.getNumberOfImages(), 1); printLine(1, "Physical width (dpi): ", ii.getPhysicalWidthDpi(), 1); printLine(1, "Physical height (dpi): ", ii.getPhysicalHeightDpi(), 1); printLine(1, "Physical width (inches): ", ii.getPhysicalWidthInch(), 1.0f); printLine(1, "Physical height (inches): ", ii.getPhysicalHeightInch(), 1.0f); int numComments = ii.getNumberOfComments(); printLine(1, "Number of textual comments: ", numComments, 1); if (numComments > 0) { for (int i = 0; i < numComments; i++) { printLine(2, null, ii.getComment(i)); } } } private int read() throws IOException { if (in != null) { return in.read(); } else { return din.readByte(); } } private int read(byte[] a) throws IOException { if (in != null) { return in.read(a); } else { din.readFully(a); return a.length; } } private int read(byte[] a, int offset, int num) throws IOException { if (in != null) { return in.read(a, offset, num); } else { din.readFully(a, offset, num); return num; } } private String readLine() throws IOException { return readLine(new StringBuffer()); } private String readLine(StringBuffer sb) throws IOException { boolean finished; do { int value = read(); finished = (value == -1 || value == 10); if (!finished) { sb.append((char)value); } } while (!finished); return sb.toString(); } private long readUBits( int numBits ) throws IOException { if (numBits == 0) { return 0; } int bitsLeft = numBits; long result = 0; if (bitPos == 0) { //no value in the buffer - read a byte if (in != null) { bitBuf = in.read(); } else { bitBuf = din.readByte(); } bitPos = 8; } while( true ) { int shift = bitsLeft - bitPos; if( shift > 0 ) { // Consume the entire buffer result |= bitBuf << shift; bitsLeft -= bitPos; // Get the next byte from the input stream if (in != null) { bitBuf = in.read(); } else { bitBuf = din.readByte(); } bitPos = 8; } else { // Consume a portion of the buffer result |= bitBuf >> -shift; bitPos -= bitsLeft; bitBuf &= 0xff >> (8 - bitPos); // mask off the consumed bits return result; } } } /** * Read a signed integer value from input. * @param numBits number of bits to read */ private int readSBits(int numBits) throws IOException { // Get the number as an unsigned value. long uBits = readUBits( numBits ); // Is the number negative? if( ( uBits & (1L << (numBits - 1))) != 0 ) { // Yes. Extend the sign. uBits |= -1L << numBits; } return (int)uBits; } /* private void synchBits() { bitBuf = 0; bitPos = 0; }*/ /* private String readLine(int firstChar) throws IOException { StringBuffer result = new StringBuffer(); result.append((char)firstChar); return readLine(result); }*/ private static void run(String sourceName, InputStream in, ImageInfo imageInfo, boolean verbose) { imageInfo.setInput(in); imageInfo.setDetermineImageNumber(true); imageInfo.setCollectComments(verbose); if (imageInfo.check()) { print(sourceName, imageInfo, verbose); } } /** * Specify whether textual comments are supposed to be extracted from input. * Default is false. * If enabled, comments will be added to an internal list. * @param newValue if true, this class will read comments * @see #getNumberOfComments * @see #getComment */ public void setCollectComments(boolean newValue) { collectComments = newValue; } /** * Specify whether the number of images in a file is to be * determined - default is false. * This is a special option because some file formats require running over * the entire file to find out the number of images, a rather time-consuming task. * Not all file formats support more than one image. * If this method is called with true as argument, * the actual number of images can be queried via * {@link #getNumberOfImages()} after a successful call to {@link #check()}. * @param newValue will the number of images be determined? * @see #getNumberOfImages */ public void setDetermineImageNumber(boolean newValue) { determineNumberOfImages = newValue; } /** * Set the input stream to the argument stream (or file). * Note that {@link java.io.RandomAccessFile} implements {@link java.io.DataInput}. * @param dataInput the input stream to read from */ public void setInput(DataInput dataInput) { din = dataInput; in = null; } /** * Set the input stream to the argument stream (or file). * @param inputStream the input stream to read from */ public void setInput(InputStream inputStream) { in = inputStream; din = null; } private void setPhysicalHeightDpi(int newValue) { physicalWidthDpi = newValue; } private void setPhysicalWidthDpi(int newValue) { physicalHeightDpi = newValue; } private void skip(int num) throws IOException { while (num > 0) { long result; if (in != null) { result = in.skip(num); } else { result = din.skipBytes(num); } if (result > 0) { num -= result; } } } }