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https://github.com/michaelrsweet/pdfio.git
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Add ToUnicode map.
This commit is contained in:
Michael R Sweet
parent
088646e1cf
commit
97934ab995
@ -8,6 +8,7 @@ v1.1.4 (Month DD, YYYY)
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- Fixed detection of encrypted strings that are too short (Issue #52)
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- Fixed a TrueType CMAP decoding bug.
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- Fixed a text rendering issue for Asian text.
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- Added a ToUnicode map for Unicode text to support text copying.
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v1.1.3 (November 15, 2023)
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209
pdfio-content.c
209
pdfio-content.c
@ -1289,13 +1289,13 @@ pdfioFileCreateFontObjFromFile(
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pdfio_dict_t *dict, // Font dictionary
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*desc, // Font descriptor
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*file; // Font file dictionary
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pdfio_obj_t *obj, // Font object
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pdfio_obj_t *obj = NULL, // Font object
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*desc_obj, // Font descriptor object
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*file_obj; // Font file object
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const char *basefont; // Base font name
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pdfio_array_t *bbox; // Font bounding box array
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pdfio_stream_t *st; // Font stream
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int fd; // File
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int fd = -1; // File
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unsigned char buffer[16384]; // Read buffer
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ssize_t bytes; // Bytes read
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@ -1324,48 +1324,32 @@ pdfioFileCreateFontObjFromFile(
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// Create the font file dictionary and object...
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if ((file = pdfioDictCreate(pdf)) == NULL)
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{
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ttfDelete(font);
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close(fd);
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return (NULL);
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}
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goto done;
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pdfioDictSetName(file, "Filter", "FlateDecode");
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if ((file_obj = pdfioFileCreateObj(pdf, file)) == NULL)
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{
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ttfDelete(font);
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close(fd);
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return (NULL);
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}
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goto done;
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if ((st = pdfioObjCreateStream(file_obj, PDFIO_FILTER_FLATE)) == NULL)
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{
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ttfDelete(font);
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close(fd);
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return (NULL);
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}
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goto done;
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while ((bytes = read(fd, buffer, sizeof(buffer))) > 0)
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{
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if (!pdfioStreamWrite(st, buffer, (size_t)bytes))
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{
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ttfDelete(font);
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close(fd);
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pdfioStreamClose(st);
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return (NULL);
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goto done;
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}
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}
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close(fd);
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fd = -1;
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pdfioStreamClose(st);
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// Create the font descriptor dictionary and object...
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if ((bbox = pdfioArrayCreate(pdf)) == NULL)
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{
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ttfDelete(font);
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return (NULL);
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}
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goto done;
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ttfGetBounds(font, &bounds);
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@ -1375,10 +1359,7 @@ pdfioFileCreateFontObjFromFile(
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pdfioArrayAppendNumber(bbox, bounds.top);
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if ((desc = pdfioDictCreate(pdf)) == NULL)
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{
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ttfDelete(font);
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return (NULL);
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}
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goto done;
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basefont = pdfioStringCreate(pdf, ttfGetPostScriptName(font));
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@ -1397,22 +1378,25 @@ pdfioFileCreateFontObjFromFile(
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pdfioDictSetNumber(desc, "StemV", ttfGetWeight(font) / 4 + 25);
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if ((desc_obj = pdfioFileCreateObj(pdf, desc)) == NULL)
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{
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ttfDelete(font);
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return (NULL);
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}
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goto done;
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pdfioObjClose(desc_obj);
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if (unicode)
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{
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// Unicode (CID) font...
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pdfio_dict_t *cid2gid; // CIDToGIDMap dictionary
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pdfio_obj_t *cid2gid_obj; // CIDToGIDMap object
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pdfio_dict_t *cid2gid, // CIDToGIDMap dictionary
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*to_unicode; // ToUnicode dictionary
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pdfio_obj_t *cid2gid_obj, // CIDToGIDMap object
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*to_unicode_obj;// ToUnicode object
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size_t i, // Looping var
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start, // Start character
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num_cmap; // Number of CMap entries
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const int *cmap; // CMap entries
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int glyph, // Current glyph
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min_glyph, // First glyph
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max_glyph; // Last glyph
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unsigned short glyphs[65536]; // Glyph to Unicode mapping
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unsigned char *bufptr, // Pointer into buffer
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*bufend; // End of buffer
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pdfio_dict_t *type2; // CIDFontType2 font dictionary
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@ -1423,34 +1407,36 @@ pdfioFileCreateFontObjFromFile(
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*temp_array; // Temporary width sub-array
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int w0, w1; // Widths
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// Create a CIDSystemInfo mapping to Adobe UCS2 v0 (Unicode)
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if ((sidict = pdfioDictCreate(pdf)) == NULL)
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goto done;
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pdfioDictSetString(sidict, "Registry", "Adobe");
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pdfioDictSetString(sidict, "Ordering", "Identity");
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pdfioDictSetNumber(sidict, "Supplement", 0);
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// Create a CIDToGIDMap object for the Unicode font...
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if ((cid2gid = pdfioDictCreate(pdf)) == NULL)
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{
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ttfDelete(font);
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return (NULL);
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}
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goto done;
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#ifndef DEBUG
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pdfioDictSetName(cid2gid, "Filter", "FlateDecode");
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#endif // !DEBUG
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if ((cid2gid_obj = pdfioFileCreateObj(pdf, cid2gid)) == NULL)
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{
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ttfDelete(font);
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return (NULL);
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}
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goto done;
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#ifdef DEBUG
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if ((st = pdfioObjCreateStream(cid2gid_obj, PDFIO_FILTER_NONE)) == NULL)
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#else
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if ((st = pdfioObjCreateStream(cid2gid_obj, PDFIO_FILTER_FLATE)) == NULL)
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#endif // DEBUG
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{
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ttfDelete(font);
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return (NULL);
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}
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goto done;
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cmap = ttfGetCMap(font, &num_cmap);
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cmap = ttfGetCMap(font, &num_cmap);
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min_glyph = 65536;
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max_glyph = 0;
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memset(glyphs, 0, sizeof(glyphs));
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PDFIO_DEBUG("pdfioFileCreateFontObjFromFile: num_cmap=%u\n", (unsigned)num_cmap);
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@ -1468,6 +1454,12 @@ pdfioFileCreateFontObjFromFile(
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// Map to specified glyph...
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*bufptr++ = (unsigned char)(cmap[i] >> 8);
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*bufptr++ = (unsigned char)(cmap[i] & 255);
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glyphs[cmap[i]] = i;
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if (cmap[i] < min_glyph)
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min_glyph = cmap[i];
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if (cmap[i] > max_glyph)
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max_glyph = cmap[i];
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}
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if (bufptr >= bufend)
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@ -1476,8 +1468,7 @@ pdfioFileCreateFontObjFromFile(
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if (!pdfioStreamWrite(st, buffer, (size_t)(bufptr - buffer)))
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{
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pdfioStreamClose(st);
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ttfDelete(font);
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return (NULL);
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goto done;
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}
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bufptr = buffer;
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@ -1490,32 +1481,64 @@ pdfioFileCreateFontObjFromFile(
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if (!pdfioStreamWrite(st, buffer, (size_t)(bufptr - buffer)))
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{
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pdfioStreamClose(st);
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ttfDelete(font);
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return (NULL);
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goto done;
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}
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}
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pdfioStreamClose(st);
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// ToUnicode mapping object
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to_unicode = pdfioDictCreate(pdf);
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pdfioDictSetName(to_unicode, "Type", "CMap");
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pdfioDictSetName(to_unicode, "CMapName", "Adobe-Identity-UCS2");
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pdfioDictSetDict(to_unicode, "CIDSystemInfo", sidict);
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#ifndef DEBUG
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pdfioDictSetName(to_unicode, "Filter", "FlateDecode");
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#endif // !DEBUG
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if ((to_unicode_obj = pdfioFileCreateObj(pdf, to_unicode)) == NULL)
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goto done;
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#ifdef DEBUG
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if ((st = pdfioObjCreateStream(to_unicode_obj, PDFIO_FILTER_NONE)) == NULL)
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#else
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if ((st = pdfioObjCreateStream(to_unicode_obj, PDFIO_FILTER_FLATE)) == NULL)
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#endif // DEBUG
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goto done;
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pdfioStreamPuts(st,
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"stream\n"
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"/CIDInit /ProcSet findresource begin\n"
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"12 dict begin\n"
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"begincmap\n"
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"/CIDSystemInfo<<\n"
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"/Registry (Adobe)\n"
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"/Ordering (UCS2)\n"
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"/Supplement 0\n"
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">> def\n"
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"/CMapName /Adobe-Identity-UCS2 def\n"
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"/CMapType 2 def\n"
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"1 begincodespacerange\n"
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"<0000> <FFFF>\n"
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"endcodespacerange\n"
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"1 beginbfrange\n"
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"<0000> <FFFF> <0000>\n"
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"endbfrange\n"
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"endcmap\n"
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"CMapName currentdict /CMap defineresource pop\n"
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"end\n"
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"end\n");
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pdfioStreamClose(st);
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// Create a CIDFontType2 dictionary for the Unicode font...
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if ((type2 = pdfioDictCreate(pdf)) == NULL)
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{
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ttfDelete(font);
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return (NULL);
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}
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if ((sidict = pdfioDictCreate(pdf)) == NULL)
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{
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ttfDelete(font);
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return (NULL);
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}
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goto done;
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// Width array
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if ((w_array = pdfioArrayCreate(pdf)) == NULL)
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{
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ttfDelete(font);
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return (NULL);
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}
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goto done;
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for (start = 0, w0 = ttfGetWidth(font, 0), i = 1; i < 65536; start = i, w0 = w1, i ++)
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{
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@ -1535,10 +1558,7 @@ pdfioFileCreateFontObjFromFile(
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pdfioArrayAppendNumber(w_array, start);
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if ((temp_array = pdfioArrayCreate(pdf)) == NULL)
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{
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ttfDelete(font);
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return (NULL);
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}
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goto done;
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pdfioArrayAppendNumber(temp_array, w0);
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for (w0 = w1, i ++; i < 65536; w0 = w1, i ++)
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@ -1558,11 +1578,6 @@ pdfioFileCreateFontObjFromFile(
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}
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}
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// CIDSystemInfo mapping to Adobe UCS2 v0 (Unicode)
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pdfioDictSetString(sidict, "Registry", "Adobe");
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pdfioDictSetString(sidict, "Ordering", "Identity");
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pdfioDictSetNumber(sidict, "Supplement", 0);
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// Then the dictionary for the CID base font...
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pdfioDictSetName(type2, "Type", "Font");
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pdfioDictSetName(type2, "Subtype", "CIDFontType2");
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@ -1573,54 +1588,38 @@ pdfioFileCreateFontObjFromFile(
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pdfioDictSetArray(type2, "W", w_array);
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if ((type2_obj = pdfioFileCreateObj(pdf, type2)) == NULL)
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{
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ttfDelete(font);
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return (NULL);
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}
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goto done;
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pdfioObjClose(type2_obj);
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// Create a Type 0 font object...
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if ((descendants = pdfioArrayCreate(pdf)) == NULL)
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{
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ttfDelete(font);
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return (NULL);
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}
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goto done;
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pdfioArrayAppendObj(descendants, type2_obj);
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if ((dict = pdfioDictCreate(pdf)) == NULL)
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{
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ttfDelete(font);
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return (NULL);
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}
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goto done;
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pdfioDictSetName(dict, "Type", "Font");
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pdfioDictSetName(dict, "Subtype", "Type0");
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pdfioDictSetName(dict, "BaseFont", basefont);
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pdfioDictSetArray(dict, "DescendantFonts", descendants);
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pdfioDictSetName(dict, "Encoding", "Identity-H");
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pdfioDictSetObj(dict, "ToUnicode", to_unicode_obj);
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if ((obj = pdfioFileCreateObj(pdf, dict)) == NULL)
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return (NULL);
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pdfioObjClose(obj);
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if ((obj = pdfioFileCreateObj(pdf, dict)) != NULL)
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pdfioObjClose(obj);
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}
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else
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{
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// Simple (CP1282 or custom encoding) 8-bit font...
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if (ttfGetMaxChar(font) >= 255 && !pdf->cp1252_obj && !create_cp1252(pdf))
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{
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ttfDelete(font);
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return (NULL);
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}
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goto done;
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// Create a TrueType font object...
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if ((dict = pdfioDictCreate(pdf)) == NULL)
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{
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ttfDelete(font);
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return (NULL);
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}
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goto done;
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pdfioDictSetName(dict, "Type", "Font");
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pdfioDictSetName(dict, "Subtype", "TrueType");
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@ -1630,15 +1629,15 @@ pdfioFileCreateFontObjFromFile(
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pdfioDictSetObj(dict, "FontDescriptor", desc_obj);
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if ((obj = pdfioFileCreateObj(pdf, dict)) == NULL)
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{
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ttfDelete(font);
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return (NULL);
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}
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pdfioObjClose(obj);
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if ((obj = pdfioFileCreateObj(pdf, dict)) != NULL)
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pdfioObjClose(obj);
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}
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done:
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if (fd >= 0)
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close(fd);
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ttfDelete(font);
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return (obj);
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