diff options
author | bungeman <bungeman@google.com> | 2015-10-09 13:45:50 -0700 |
---|---|---|
committer | Commit bot <commit-bot@chromium.org> | 2015-10-09 13:45:50 -0700 |
commit | 21f99b7733c5d468deee9f8dadd59e77ed33d5ca (patch) | |
tree | c56a97b123e22e8088d834fe10909a6584668dfc /src/pdf/SkPDFMetadata.cpp | |
parent | f276ac5c16d39a2b877300d760041f0291bb5ec9 (diff) |
Revert of SkPDF: Optionally output PDF/A-2b archive format. (patchset #5 id:80001 of https://codereview.chromium.org/1394263003/ )
Reason for revert:
SkMD5 is not really part of the Skia library. This is breaking the roll by using it, since Chromium doesn't build it.
Original issue's description:
> SkPDF: Optionally output PDF/A-2b archive format.
>
> Note: this format does not yet pass validation tests.
>
> Add skia_pdf_generate_pdfa GYP flag. Default to off for now.
> PDF/A files are not reproducable, so they make correctness
> testing harder.
>
> Turn the Metadata struct into te SkPDFMetadata struct. This
> splits out a lot of functionality around both kinds of metadata.
>
> When PDF/A is used, add an ID entry to the trailer.
>
> Add SkPDFObjNumMap::addObjectRecursively.
>
> Test with
>
> GYP_DEFINES=skia_pdf_generate_pdfa=1 bin/sync-and-gyp
> ninja -C out/Release dm
> out/Release/dm --config pdf --src skp gm -w /tmp/dm
>
> With skia_pdf_generate_pdfa=0, all PDFs generated from GMs and
> SKPs are identical. With skia_pdf_generate_pdfa=1, all PDFs
> generated from GMs and SKPs render identically in Pdfium.
>
> BUG=skia:3110
>
> Committed: https://skia.googlesource.com/skia/+/939c0fe51f157104758bcb268643c8b6d317a530
TBR=tomhudson@google.com,halcanary@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:3110
Review URL: https://codereview.chromium.org/1398193002
Diffstat (limited to 'src/pdf/SkPDFMetadata.cpp')
-rw-r--r-- | src/pdf/SkPDFMetadata.cpp | 347 |
1 files changed, 0 insertions, 347 deletions
diff --git a/src/pdf/SkPDFMetadata.cpp b/src/pdf/SkPDFMetadata.cpp deleted file mode 100644 index 6a68a487b8..0000000000 --- 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("&") - strlen("&") - } else if (input[i] == '<') { - extra += 3; // strlen("<") - strlen("<") - } - } - return extra; -} - -const SkString escape_xml(const SkString& input, - const char* before = nullptr, - const char* after = nullptr) { - if (input.size() == 0) { - return input; - } - // "&" --> "&" and "<" --> "<" - // 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[] = "&"; - static const char kLt[] = "<"; - 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 |