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gnujpdf - various CMAP subtable formats support for drawing text
This commit is contained in:
Jindra Petřík
@@ -198,15 +198,84 @@ public class TtfParser {
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int version = readUnsignedShort(input);
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int numberSubtables = readUnsignedShort(input);
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for (int i = 0; i < numberSubtables; i++) {
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int platFormId = readUnsignedShort(input);
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int platFormSpecificId = readUnsignedShort(input);
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long offset = readUnsignedLong(input);
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seek(input, tableOffsets.get("cmap") + offset);
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List<Integer> platFormIds = new ArrayList<>();
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List<Integer> platFormSpecificIds = new ArrayList<>();
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List<Long> offsets = new ArrayList<>();
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for (int i = 0; i < numberSubtables; i++) {
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platFormIds.add(readUnsignedShort(input));
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platFormSpecificIds.add(readUnsignedShort(input));
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offsets.add(readUnsignedLong(input));
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}
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for (int i = 0; i < numberSubtables; i++) {
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long offset = offsets.get(i);
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seek(input, tableOffsets.get("cmap") + offset);
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int format = readUnsignedShort(input);
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switch (format) {
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case 4:
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case 0: //byte enconding table
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{
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int length = readUnsignedShort(input);
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int languageCode = readUnsignedShort(input);
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for (int c = 0; c < 256; c++) {
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ctg.put(c, readUnsignedByte(input));
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}
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break;
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}
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case 2: //high byte mapping through table
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{
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int length = readUnsignedShort(input);
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int languageCode = readUnsignedShort(input);
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int subHeaderKeys[] = new int[256];
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int maxSubHeaderIndex = 0;
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for (int c = 0; c < 256; c++) {
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subHeaderKeys[c] = readUnsignedShort(input);
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maxSubHeaderIndex = Math.max(maxSubHeaderIndex, subHeaderKeys[i] / 8);
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}
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List<Integer> firstCodes = new ArrayList<>();
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List<Integer> entryCountCodes = new ArrayList<>();
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List<Short> idDeltas = new ArrayList<>();
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List<Integer> idRangeOffsets = new ArrayList<>();
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for (int c = 0; c <= maxSubHeaderIndex; c++) {
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firstCodes.add(readUnsignedShort(input));
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entryCountCodes.add(readUnsignedShort(input));
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idDeltas.add(readShort(input));
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idRangeOffsets.add(readUnsignedShort(input) - (maxSubHeaderIndex + 1 - i - 1) * 8 - 2);
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}
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long startGlyphIndexOffset = input.getFilePointer();
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for (int c = 0; c <= maxSubHeaderIndex; c++) {
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int firstCode = firstCodes.get(c);
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int idRangeOffset = idRangeOffsets.get(c);
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int idDelta = idDeltas.get(c);
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int entryCount = entryCountCodes.get(c);
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input.seek(startGlyphIndexOffset + idRangeOffset);
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for (int j = 0; j < entryCount; ++j) {
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int charCode = i;
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charCode = (charCode << 8) + (firstCode + j);
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int p = readUnsignedShort(input);
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if (p > 0) {
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p = (p + idDelta) % 65536;
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if (p < 0) {
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p += 65536;
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}
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}
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if (p >= numGlyphs) {
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continue;
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}
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ctg.put(charCode, p);
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}
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}
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break;
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}
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case 4: //segment mapping to delta values
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{
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int length = readUnsignedShort(input);
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int languageCode = readUnsignedShort(input);
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int segCountX2 = readUnsignedShort(input);
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@@ -263,9 +332,172 @@ public class TtfParser {
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}
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}
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break;
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}
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}
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case 6: {
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int length = readUnsignedShort(input);
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int languageCode = readUnsignedShort(input);
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int firstCode = readUnsignedShort(input);
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int entryCount = readUnsignedShort(input);
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if (entryCount == 0) {
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break;
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}
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int[] glyphIdArray = readUnsignedShortArray(entryCount, input);
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for (int c = 0; c < entryCount; c++) {
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ctg.put(firstCode + c, glyphIdArray[c]);
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}
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break;
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}
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case 8: { //mixed 16-bit and 32-bit coverage
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readUnsignedShort(input); //reserved, set to 0
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long length = readUnsignedLong(input);
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long languageCode = readUnsignedLong(input);
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final long LEAD_OFFSET = 0xD800l - (0x10000 >> 10);
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final long SURROGATE_OFFSET = 0x10000l - (0xD800 << 10) - 0xDC00;
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int[] is32 = readUnsignedByteArray(8192, input);
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long nbGroups = readUnsignedLong(input);
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break;
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if (nbGroups > 65536) {
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throw new IOException("CMap ( Subtype8 ) is invalid");
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}
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for (long c = 0; c < nbGroups; c++) {
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long firstCode = readUnsignedLong(input);
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long endCode = readUnsignedLong(input);
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long startGlyph = readUnsignedLong(input);
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if (firstCode > endCode || 0 > firstCode) {
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throw new IOException("Range invalid");
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}
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for (long j = firstCode; j <= endCode; ++j) {
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// -- Convert the Character code in decimal
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if (j > Integer.MAX_VALUE) {
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throw new IOException("[Sub Format 8] Invalid character code " + j);
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}
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if ((int) j / 8 >= is32.length) {
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throw new IOException("[Sub Format 8] Invalid character code " + j);
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}
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int currentCharCode;
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if ((is32[(int) j / 8] & (1 << ((int) j % 8))) == 0) {
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currentCharCode = (int) j;
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} else {
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long lead = LEAD_OFFSET + (j >> 10);
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long trail = 0xDC00 + (j & 0x3FF);
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long codepoint = (lead << 10) + trail + SURROGATE_OFFSET;
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if (codepoint > Integer.MAX_VALUE) {
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throw new IOException("[Sub Format 8] Invalid character code " + codepoint);
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}
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currentCharCode = (int) codepoint;
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}
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long glyphIndex = startGlyph + (j - firstCode);
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if (glyphIndex > numGlyphs || glyphIndex > Integer.MAX_VALUE) {
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throw new IOException("CMap contains an invalid glyph index");
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}
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ctg.put(currentCharCode, (int) glyphIndex);
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}
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}
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break;
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}
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case 10: { //trimmed array
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readUnsignedShort(input); //reserved, set to 10
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long length = readUnsignedLong(input);
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long languageCode = readUnsignedLong(input);
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long startCode = readUnsignedLong(input);
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long numChars = readUnsignedLong(input);
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if (numChars > Integer.MAX_VALUE) {
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//throw new IOException("Invalid number of Characters");
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}
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if (startCode < 0 || startCode > 0x0010FFFF || (startCode + numChars) > 0x0010FFFF
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|| ((startCode + numChars) >= 0x0000D800 && (startCode + numChars) <= 0x0000DFFF)) {
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//throw new IOException("Invalid Characters codes");
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}
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for (long c = startCode; c < startCode + numChars; c++) {
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ctg.put((int) c, readUnsignedShort(input));
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}
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break;
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}
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case 12: { //segmented coverage
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readUnsignedShort(input); //reserved, set to 0
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long length = readUnsignedLong(input);
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long languageCode = readUnsignedLong(input);
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long nbGroups = readUnsignedLong(input);
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for (long c = 0; c < nbGroups; ++c) {
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long firstCode = readUnsignedLong(input);
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long endCode = readUnsignedLong(input);
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long startGlyph = readUnsignedLong(input);
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if (firstCode < 0 || firstCode > 0x0010FFFF
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|| firstCode >= 0x0000D800 && firstCode <= 0x0000DFFF) {
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throw new IOException("Invalid characters codes");
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}
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if (endCode > 0 && endCode < firstCode
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|| endCode > 0x0010FFFF
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|| endCode >= 0x0000D800 && endCode <= 0x0000DFFF) {
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throw new IOException("Invalid characters codes");
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}
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for (long j = 0; j <= endCode - firstCode; ++j) {
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long glyphIndex = startGlyph + j;
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if (glyphIndex >= numGlyphs) {
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//warn("Format 12 cmap contains an invalid glyph index");
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break;
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}
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if (firstCode + j > 0x10FFFF) {
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//warn("Format 12 cmap contains character beyond UCS-4");
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}
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ctg.put((int) (firstCode + j), (int) glyphIndex);
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}
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}
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break;
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}
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case 13: { //many-to-one mappings
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readUnsignedShort(input); //reserved, set to 0
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long length = readUnsignedLong(input);
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long languageCode = readUnsignedLong(input);
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long nbGroups = readUnsignedLong(input);
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for (long c = 0; c < nbGroups; c++) {
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long firstCode = readUnsignedLong(input);
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long endCode = readUnsignedLong(input);
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long glyphId = readUnsignedLong(input);
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if (glyphId > numGlyphs) {
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//warn("Format 13 cmap contains an invalid glyph index");
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break;
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}
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if (firstCode < 0 || firstCode > 0x0010FFFF || (firstCode >= 0x0000D800 && firstCode <= 0x0000DFFF)) {
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throw new IOException("Invalid Characters codes");
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}
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if ((endCode > 0 && endCode < firstCode) || endCode > 0x0010FFFF
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|| (endCode >= 0x0000D800 && endCode <= 0x0000DFFF)) {
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throw new IOException("Invalid Characters codes");
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}
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for (long j = 0; j <= endCode - firstCode; ++j) {
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if (firstCode + j > Integer.MAX_VALUE) {
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throw new IOException("Character Code greater than Integer.MAX_VALUE");
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}
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if (firstCode + j > 0x10FFFF) {
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//warn("Format 13 cmap contains character beyond UCS-4");
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}
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ctg.put((int) (firstCode + j), (int) glyphId);
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}
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}
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break;
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}
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}
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}
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if (!ctg.containsKey(0)) {
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ctg.put(0, 0);
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@@ -471,6 +703,22 @@ public class TtfParser {
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return b;
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}
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private int[] readUnsignedByteArray(int size, RandomAccessFile input) throws IOException {
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int ret[] = new int[size];
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for (int i = 0; i < size; i++) {
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ret[i] = readUnsignedByte(input);
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}
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return ret;
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}
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private int[] readUnsignedShortArray(int size, RandomAccessFile input) throws IOException {
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int ret[] = new int[size];
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for (int i = 0; i < size; i++) {
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ret[i] = readUnsignedShort(input);
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}
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return ret;
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}
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private byte readByte(RandomAccessFile input) throws IOException {
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return (byte) readUnsignedByte(input);
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}
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