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Unified Diff: src/pdf/SkPDFMetadata.cpp

Issue 1398193002: Revert of SkPDF: Optionally output PDF/A-2b archive format. (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: Created 5 years, 2 months ago
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Index: src/pdf/SkPDFMetadata.cpp
diff --git a/src/pdf/SkPDFMetadata.cpp b/src/pdf/SkPDFMetadata.cpp
deleted file mode 100644
index 6a68a487b84fc4243f3318f2cbfa09fc96550b64..0000000000000000000000000000000000000000
--- a/src/pdf/SkPDFMetadata.cpp
+++ /dev/null
@@ -1,347 +0,0 @@
-/*
- * Copyright 2015 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "SkPDFMetadata.h"
-#include "SkMD5.h"
-#include "SkPDFTypes.h"
-
-SkPDFMetadata::UUID SkPDFMetadata::uuid() const {
- // The main requirement is for the UUID to be unique; the exact
- // format of the data that will be hashed is not important.
- SkMD5 md5;
- const char uuidNamespace[] = "org.skia.pdf\n";
- md5.write(uuidNamespace, strlen(uuidNamespace));
- SkMSec msec = SkTime::GetMSecs();
- md5.write(&msec, sizeof(msec));
- SkTime::DateTime dateTime;
- SkTime::GetDateTime(&dateTime);
- md5.write(&dateTime, sizeof(dateTime));
- if (fCreation) {
- md5.write(fCreation.get(), sizeof(fCreation));
- }
- if (fModified) {
- md5.write(fModified.get(), sizeof(fModified));
- }
- for (const auto& kv : fInfo) {
- md5.write(kv.fKey.c_str(), kv.fKey.size());
- md5.write("\037", 1);
- md5.write(kv.fValue.c_str(), kv.fValue.size());
- md5.write("\036", 1);
- }
- SkMD5::Digest digest;
- md5.finish(digest);
- // See RFC 4122, page 6-7.
- digest.data[6] = (digest.data[6] & 0x0F) | 0x30;
- digest.data[8] = (digest.data[6] & 0x3F) | 0x80;
- static_assert(sizeof(digest) == sizeof(UUID), "uuid_size");
- SkPDFMetadata::UUID uuid;
- memcpy(&uuid, &digest, sizeof(digest));
- return uuid;
-}
-
-SkPDFObject* SkPDFMetadata::CreatePdfId(const UUID& doc, const UUID& instance) {
- // /ID [ <81b14aafa313db63dbd6f981e49f94f4>
- // <81b14aafa313db63dbd6f981e49f94f4> ]
- SkAutoTUnref<SkPDFArray> array(new SkPDFArray);
- static_assert(sizeof(UUID) == 16, "uuid_size");
- array->appendString(
- SkString(reinterpret_cast<const char*>(&doc), sizeof(UUID)));
- array->appendString(
- SkString(reinterpret_cast<const char*>(&instance), sizeof(UUID)));
- return array.detach();
-}
-
-static SkString pdf_date(const SkTime::DateTime& dt) {
- int timeZoneMinutes = SkToInt(dt.fTimeZoneMinutes);
- char timezoneSign = timeZoneMinutes >= 0 ? '+' : '-';
- int timeZoneHours = SkTAbs(timeZoneMinutes) / 60;
- timeZoneMinutes = SkTAbs(timeZoneMinutes) % 60;
- return SkStringPrintf(
- "D:%04u%02u%02u%02u%02u%02u%c%02d'%02d'",
- static_cast<unsigned>(dt.fYear), static_cast<unsigned>(dt.fMonth),
- static_cast<unsigned>(dt.fDay), static_cast<unsigned>(dt.fHour),
- static_cast<unsigned>(dt.fMinute),
- static_cast<unsigned>(dt.fSecond), timezoneSign, timeZoneHours,
- timeZoneMinutes);
-}
-
-SkPDFObject* SkPDFMetadata::createDocumentInformationDict() const {
- SkAutoTUnref<SkPDFDict> dict(new SkPDFDict);
- static const char* keys[] = {
- "Title", "Author", "Subject", "Keywords", "Creator"};
- for (const char* key : keys) {
- for (const SkDocument::Attribute& keyValue : fInfo) {
- if (keyValue.fKey.equals(key)) {
- dict->insertString(key, keyValue.fValue);
- }
- }
- }
- dict->insertString("Producer", "Skia/PDF");
- if (fCreation) {
- dict->insertString("CreationDate", pdf_date(*fCreation.get()));
- }
- if (fModified) {
- dict->insertString("ModDate", pdf_date(*fModified.get()));
- }
- return dict.detach();
-}
-
-#ifdef SK_PDF_GENERATE_PDFA
-// Improvement on SkStringPrintf to allow for arbitrarily long output.
-// TODO: replace SkStringPrintf.
-static SkString sk_string_printf(const char* format, ...) {
-#ifdef SK_BUILD_FOR_WIN
- va_list args;
- va_start(args, format);
- char buffer[1024];
- int length = _vsnprintf_s(buffer, sizeof(buffer), _TRUNCATE, format, args);
- va_end(args);
- if (length >= 0 && length < (int)sizeof(buffer)) {
- return SkString(buffer, length);
- }
- va_start(args, format);
- length = _vscprintf(format, args);
- va_end(args);
-
- SkString string((size_t)length);
- va_start(args, format);
- SkDEBUGCODE(int check = ) _vsnprintf_s(string.writable_str(), length + 1,
- _TRUNCATE, format, args);
- va_end(args);
- SkASSERT(check == length);
- SkASSERT(string[length] == '\0');
- return skstd::move(string);
-#else // C99/C++11 standard vsnprintf
- // TODO: When all compilers support this, remove windows-specific code.
- va_list args;
- va_start(args, format);
- char buffer[1024];
- int length = vsnprintf(buffer, sizeof(buffer), format, args);
- va_end(args);
- if (length < 0) {
- return SkString();
- }
- if (length < (int)sizeof(buffer)) {
- return SkString(buffer, length);
- }
- SkString string((size_t)length);
- va_start(args, format);
- SkDEBUGCODE(int check = )
- vsnprintf(string.writable_str(), length + 1, format, args);
- va_end(args);
- SkASSERT(check == length);
- SkASSERT(string[length] == '\0');
- return skstd::move(string);
-#endif
-}
-
-static const SkString get(const SkTArray<SkDocument::Attribute>& info,
- const char* key) {
- for (const auto& keyValue : info) {
- if (keyValue.fKey.equals(key)) {
- return keyValue.fValue;
- }
- }
- return SkString();
-}
-
-#define HEXIFY(INPUT_PTR, OUTPUT_PTR, HEX_STRING, BYTE_COUNT) \
- do { \
- for (int i = 0; i < (BYTE_COUNT); ++i) { \
- uint8_t value = *(INPUT_PTR)++; \
- *(OUTPUT_PTR)++ = (HEX_STRING)[value >> 4]; \
- *(OUTPUT_PTR)++ = (HEX_STRING)[value & 0xF]; \
- } \
- } while (false)
-static SkString uuid_to_string(const SkPDFMetadata::UUID& uuid) {
- // 8-4-4-4-12
- char buffer[36]; // [32 + 4]
- static const char gHex[] = "0123456789abcdef";
- SkASSERT(strlen(gHex) == 16);
- char* ptr = buffer;
- const uint8_t* data = uuid.fData;
- HEXIFY(data, ptr, gHex, 4);
- *ptr++ = '-';
- HEXIFY(data, ptr, gHex, 2);
- *ptr++ = '-';
- HEXIFY(data, ptr, gHex, 2);
- *ptr++ = '-';
- HEXIFY(data, ptr, gHex, 2);
- *ptr++ = '-';
- HEXIFY(data, ptr, gHex, 6);
- SkASSERT(ptr == buffer + 36);
- SkASSERT(data == uuid.fData + 16);
- return SkString(buffer, 36);
-}
-#undef HEXIFY
-
-namespace {
-class PDFXMLObject : public SkPDFObject {
-public:
- PDFXMLObject(SkString xml) : fXML(skstd::move(xml)) {}
- void emitObject(SkWStream* stream,
- const SkPDFObjNumMap& omap,
- const SkPDFSubstituteMap& smap) const override {
- SkPDFDict dict("Metadata");
- dict.insertName("Subtype", "XML");
- dict.insertInt("Length", fXML.size());
- dict.emitObject(stream, omap, smap);
- static const char streamBegin[] = " stream\n";
- stream->write(streamBegin, strlen(streamBegin));
- // Do not compress this. The standard requires that a
- // program that does not understand PDF can grep for
- // "<?xpacket" and extracť the entire XML.
- stream->write(fXML.c_str(), fXML.size());
- static const char streamEnd[] = "\nendstream";
- stream->write(streamEnd, strlen(streamEnd));
- }
-
-private:
- const SkString fXML;
-};
-} // namespace
-
-static int count_xml_escape_size(const SkString& input) {
- int extra = 0;
- for (size_t i = 0; i < input.size(); ++i) {
- if (input[i] == '&') {
- extra += 4; // strlen("&amp;") - strlen("&")
- } else if (input[i] == '<') {
- extra += 3; // strlen("&lt;") - strlen("<")
- }
- }
- return extra;
-}
-
-const SkString escape_xml(const SkString& input,
- const char* before = nullptr,
- const char* after = nullptr) {
- if (input.size() == 0) {
- return input;
- }
- // "&" --> "&amp;" and "<" --> "&lt;"
- // text is assumed to be in UTF-8
- // all strings are xml content, not attribute values.
- size_t beforeLen = before ? strlen(before) : 0;
- size_t afterLen = after ? strlen(after) : 0;
- int extra = count_xml_escape_size(input);
- SkString output(input.size() + extra + beforeLen + afterLen);
- char* out = output.writable_str();
- if (before) {
- strncpy(out, before, beforeLen);
- out += beforeLen;
- }
- static const char kAmp[] = "&amp;";
- static const char kLt[] = "&lt;";
- for (size_t i = 0; i < input.size(); ++i) {
- if (input[i] == '&') {
- strncpy(out, kAmp, strlen(kAmp));
- out += strlen(kAmp);
- } else if (input[i] == '<') {
- strncpy(out, kLt, strlen(kLt));
- out += strlen(kLt);
- } else {
- *out++ = input[i];
- }
- }
- if (after) {
- strncpy(out, after, afterLen);
- out += afterLen;
- }
- // Validate that we haven't written outside of our string.
- SkASSERT(out == &output.writable_str()[output.size()]);
- *out = '\0';
- return skstd::move(output);
-}
-
-SkPDFObject* SkPDFMetadata::createXMPObject(const UUID& doc,
- const UUID& instance) const {
- static const char templateString[] =
- "<?xpacket begin=\"\" id=\"W5M0MpCehiHzreSzNTczkc9d\"?>\n"
- "<x:xmpmeta xmlns:x=\"adobe:ns:meta/\"\n"
- " x:xmptk=\"Adobe XMP Core 5.4-c005 78.147326, "
- "2012/08/23-13:03:03\">\n"
- "<rdf:RDF "
- "xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\">\n"
- "<rdf:Description rdf:about=\"\"\n"
- " xmlns:xmp=\"http://ns.adobe.com/xap/1.0/\"\n"
- " xmlns:dc=\"http://purl.org/dc/elements/1.1/\"\n"
- " xmlns:xmpMM=\"http://ns.adobe.com/xap/1.0/mm/\"\n"
- " xmlns:pdf=\"http://ns.adobe.com/pdf/1.3/\"\n"
- " xmlns:pdfaid=\"http://www.aiim.org/pdfa/ns/id/\">\n"
- "<pdfaid:part>2</pdfaid:part>\n"
- "<pdfaid:conformance>B</pdfaid:conformance>\n"
- "%s" // ModifyDate
- "%s" // CreateDate
- "%s" // MetadataDate
- "%s" // xmp:CreatorTool
- "<dc:format>application/pdf</dc:format>\n"
- "%s" // dc:title
- "%s" // dc:description
- "%s" // author
- "%s" // keywords
- "<xmpMM:DocumentID>uuid:%s</xmpMM:DocumentID>\n"
- "<xmpMM:InstanceID>uuid:%s</xmpMM:InstanceID>\n"
- "<pdf:Producer>Skia/PDF</pdf:Producer>\n"
- "%s" // pdf:Keywords
- "</rdf:Description>\n"
- "</rdf:RDF>\n"
- "</x:xmpmeta>\n" // Note: the standard suggests 4k of padding.
- "<?xpacket end=\"w\"?>\n";
-
- SkString creationDate;
- SkString modificationDate;
- SkString metadataDate;
- if (fCreation) {
- SkString tmp;
- fCreation->toISO8601(&tmp);
- SkASSERT(0 == count_xml_escape_size(tmp));
- // YYYY-mm-ddTHH:MM:SS[+|-]ZZ:ZZ; no need to escape
- creationDate = sk_string_printf("<xmp:CreateDate>%s</xmp:CreateDate>\n",
- tmp.c_str());
- }
- if (fModified) {
- SkString tmp;
- fModified->toISO8601(&tmp);
- SkASSERT(0 == count_xml_escape_size(tmp));
- modificationDate = sk_string_printf(
- "<xmp:ModifyDate>%s</xmp:ModifyDate>\n", tmp.c_str());
- metadataDate = sk_string_printf(
- "<xmp:MetadataDate>%s</xmp:MetadataDate>\n", tmp.c_str());
- }
-
- SkString title =
- escape_xml(get(fInfo, "Title"), "<dc:title><rdf:Alt><rdf:li>",
- "</rdf:li></rdf:Alt></dc:title>\n");
- SkString author =
- escape_xml(get(fInfo, "Author"), "<dc:creator><rdf:Bag><rdf:li>",
- "</rdf:li></rdf:Bag></dc:creator>\n");
- // TODO: in theory, XMP can support multiple authors. Split on a delimiter?
- SkString subject = escape_xml(get(fInfo, "Subject"),
- "<dc:description><rdf:Alt><rdf:li>",
- "</rdf:li></rdf:Alt></dc:description>\n");
- SkString keywords1 =
- escape_xml(get(fInfo, "Keywords"), "<dc:subject><rdf:Bag><rdf:li>",
- "</rdf:li></rdf:Bag></dc:subject>\n");
- SkString keywords2 = escape_xml(get(fInfo, "Keywords"), "<pdf:Keywords>",
- "</pdf:Keywords>\n");
-
- // TODO: in theory, keywords can be a list too.
- SkString creator = escape_xml(get(fInfo, "Creator"), "<xmp:CreatorTool>",
- "</xmp:CreatorTool>\n");
- SkString documentID = uuid_to_string(doc); // no need to escape
- SkASSERT(0 == count_xml_escape_size(documentID));
- SkString instanceID = uuid_to_string(instance);
- SkASSERT(0 == count_xml_escape_size(instanceID));
- return new PDFXMLObject(sk_string_printf(
- templateString, modificationDate.c_str(), creationDate.c_str(),
- metadataDate.c_str(), creator.c_str(), title.c_str(),
- subject.c_str(), author.c_str(), keywords1.c_str(),
- documentID.c_str(), instanceID.c_str(), keywords2.c_str()));
-}
-
-#endif // SK_PDF_GENERATE_PDFA
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