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mirror of https://github.com/qpdf/qpdf.git synced 2024-12-22 02:49:00 +00:00

Inline image token type

This commit is contained in:
Jay Berkenbilt 2018-01-29 20:57:04 -05:00
parent 2699ecf13e
commit fefe25030e
9 changed files with 982 additions and 851 deletions

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@ -1,34 +1,49 @@
2018-02-04 Jay Berkenbilt <ejb@ql.org>
* Significant lexer (tokenizer) enhancements. These are changes to
the QPDFTokenizer class. These changes are of concern only to
people who are operating with PDF files at the lexical layer
using qpdf. They have little or no impact on most high-level
interfaces or the command-line tool.
* New token types tt_space and tt_comment to recognize
whitespace and comments. this makes it possible to tokenize a
PDF file or stream and preserve everything about it.
* For backward compatibility, space and comment tokens are not
returned by the tokenizer unless
QPDFTokenizer.includeIgnorable() is called.
* Better handling of null bytes. These are now included in space
tokens rather than being their own "tt_word" tokens. This
should have no impact on any correct PDF file and has no
impact on output, but it may change offsets in some error
messages when trying to parse contents of bad files. Under
default operation, qpdf does not attempt to parse content
streams, so this change is mostly invisible.
* Bug fix to handling of bad tokens at ends of streams. Now,
when allowEOF() has been called, these are treated as bad tokens
(tt_bad or an exception, depending on invocation), and a
separate tt_eof token is returned. Before the bad token
contents were returned as the value of a tt_eof token. tt_eof
tokens are always empty now.
* Fix a bug that would, on rare occasions, report the offset in an
error message in the wrong space because of spaces or comments
adjacent to a bad token.
* Clarify in comments exactly where the input source is
positioned surrounding calls to readToken and getToken.
the QPDFTokenizer class. These changes are of concern only to
people who are operating with PDF files at the lexical layer using
qpdf. They have little or no impact on most high-level interfaces
or the command-line tool.
New token types tt_space and tt_comment to recognize whitespace
and comments. this makes it possible to tokenize a PDF file or
stream and preserve everything about it.
For backward compatibility, space and comment tokens are not
returned by the tokenizer unless QPDFTokenizer.includeIgnorable()
is called.
Better handling of null bytes. These are now included in space
tokens rather than being their own "tt_word" tokens. This should
have no impact on any correct PDF file and has no impact on
output, but it may change offsets in some error messages when
trying to parse contents of bad files. Under default operation,
qpdf does not attempt to parse content streams, so this change is
mostly invisible.
Bug fix to handling of bad tokens at ends of streams. Now, when
allowEOF() has been called, these are treated as bad tokens
(tt_bad or an exception, depending on invocation), and a
separate tt_eof token is returned. Before the bad token
contents were returned as the value of a tt_eof token. tt_eof
tokens are always empty now.
Fix a bug that would, on rare occasions, report the offset in an
error message in the wrong space because of spaces or comments
adjacent to a bad token.
Clarify in comments exactly where the input source is positioned
surrounding calls to readToken and getToken.
* Add a new token type for inline images. This token type is only
returned by QPDFTokenizer immediately following a call to
expectInlineImage(). This change includes internal refactoring of
a handful of places that all separately handled inline images, The
logic of detecting inline images in content streams is now handled
in one place in the code. Also we are more flexible about what
characters may surround the EI operator that marks the end of an
inline image.
2018-02-04 Jay Berkenbilt <ejb@ql.org>

View File

@ -34,7 +34,8 @@ class QPDFTokenizer
public:
// Token type tt_eof is only returned of allowEOF() is called on
// the tokenizer. tt_eof was introduced in QPDF version 4.1.
// tt_space and tt_comment were added in QPDF version 8.
// tt_space, tt_comment, and tt_inline_image were added in QPDF
// version 8.
enum token_type_e
{
tt_bad,
@ -54,6 +55,7 @@ class QPDFTokenizer
tt_eof,
tt_space,
tt_comment,
tt_inline_image,
};
class Token
@ -128,11 +130,17 @@ class QPDFTokenizer
QPDF_DLL
void includeIgnorable();
// Mode of operation:
// There are two modes of operation: push and pull. The pull
// method is easier but requires an input source. The push method
// is more complicated but can be used to tokenize a stream of
// incoming characters in a pipeline.
// Keep presenting characters and calling getToken() until
// getToken() returns true. When it does, be sure to check
// unread_ch and to unread ch if it is true.
// Push mode:
// Keep presenting characters with presentCharacter() and
// presentEOF() and calling getToken() until getToken() returns
// true. When it does, be sure to check unread_ch and to unread ch
// if it is true.
// It these are called when a token is available, an exception
// will be thrown.
@ -155,15 +163,30 @@ class QPDFTokenizer
QPDF_DLL
bool betweenTokens();
// Read a token from an input source. Context describes the
// Pull mode:
// Read a token from an input source. Context describes the
// context in which the token is being read and is used in the
// exception thrown if there is an error.
// exception thrown if there is an error. After a token is read,
// the position of the input source returned by input->tell()
// points to just after the token, and the input source's "last
// offset" as returned by input->getLastOffset() points to the
// beginning of the token.
QPDF_DLL
Token readToken(PointerHolder<InputSource> input,
std::string const& context,
bool allow_bad = false,
size_t max_len = 0);
// Calling this method puts the tokenizer in a state for reading
// inline images. In that state, it will return all data up to and
// including the next EI token. After you call this method, the
// next call to readToken (or the token created next time getToken
// returns true) will either be tt_inline_image or tt_bad. This is
// the only way readToken returns a tt_inline_image token.
QPDF_DLL
void expectInlineImage();
private:
// Do not implement copy or assignment
QPDFTokenizer(QPDFTokenizer const&);
@ -171,10 +194,11 @@ class QPDFTokenizer
void resolveLiteral();
bool isSpace(char);
bool isDelimiter(char);
enum state_e {
st_top, st_in_space, st_in_comment, st_in_string, st_lt, st_gt,
st_literal, st_in_hexstring, st_token_ready
st_literal, st_in_hexstring, st_inline_image, st_token_ready
};
class Members

View File

@ -69,6 +69,12 @@ QPDFTokenizer::isSpace(char ch)
return ((ch == '\0') || QUtil::is_space(ch));
}
bool
QPDFTokenizer::isDelimiter(char ch)
{
return (strchr(" \t\n\v\f\r()<>[]{}/%", ch) != 0);
}
void
QPDFTokenizer::resolveLiteral()
{
@ -95,7 +101,7 @@ QPDFTokenizer::resolveLiteral()
if (ch == '\0')
{
this->m->type = tt_bad;
QTC::TC("qpdf", "QPDF_Tokenizer null in name");
QTC::TC("qpdf", "QPDFTokenizer null in name");
this->m->error_message =
"null character not allowed in name token";
nval += "#00";
@ -108,7 +114,7 @@ QPDFTokenizer::resolveLiteral()
}
else
{
QTC::TC("qpdf", "QPDF_Tokenizer bad name");
QTC::TC("qpdf", "QPDFTokenizer bad name");
this->m->type = tt_bad;
this->m->error_message = "invalid name token";
nval += *p;
@ -209,7 +215,7 @@ QPDFTokenizer::presentCharacter(char ch)
if (ch == ')')
{
this->m->type = tt_bad;
QTC::TC("qpdf", "QPDF_Tokenizer bad )");
QTC::TC("qpdf", "QPDFTokenizer bad )");
this->m->error_message = "unexpected )";
this->m->state = st_token_ready;
}
@ -301,7 +307,7 @@ QPDFTokenizer::presentCharacter(char ch)
{
this->m->val = ">";
this->m->type = tt_bad;
QTC::TC("qpdf", "QPDF_Tokenizer bad >");
QTC::TC("qpdf", "QPDFTokenizer bad >");
this->m->error_message = "unexpected >";
this->m->unread_char = true;
this->m->char_to_unread = ch;
@ -403,7 +409,7 @@ QPDFTokenizer::presentCharacter(char ch)
}
else if (this->m->state == st_literal)
{
if (strchr(" \t\n\v\f\r()<>[]{}/%", ch) != 0)
if (isDelimiter(ch))
{
// A C-locale whitespace character or delimiter terminates
// token. It is important to unread the whitespace
@ -423,6 +429,25 @@ QPDFTokenizer::presentCharacter(char ch)
this->m->val += ch;
}
}
else if (this->m->state == st_inline_image)
{
size_t len = this->m->val.length();
if ((len >= 4) &&
isDelimiter(this->m->val.at(len-4)) &&
(this->m->val.at(len-3) == 'E') &&
(this->m->val.at(len-2) == 'I') &&
isDelimiter(this->m->val.at(len-1)))
{
this->m->type = tt_inline_image;
this->m->unread_char = true;
this->m->char_to_unread = ch;
this->m->state = st_token_ready;
}
else
{
this->m->val += ch;
}
}
else
{
handled = false;
@ -468,7 +493,7 @@ QPDFTokenizer::presentCharacter(char ch)
else
{
this->m->type = tt_bad;
QTC::TC("qpdf", "QPDF_Tokenizer bad hexstring character");
QTC::TC("qpdf", "QPDFTokenizer bad hexstring character");
this->m->error_message = std::string("invalid character (") +
ch + ") in hexstring";
this->m->state = st_token_ready;
@ -495,9 +520,23 @@ QPDFTokenizer::presentCharacter(char ch)
void
QPDFTokenizer::presentEOF()
{
if (this->m->state == st_inline_image)
{
size_t len = this->m->val.length();
if ((len >= 3) &&
isDelimiter(this->m->val.at(len-3)) &&
(this->m->val.at(len-2) == 'E') &&
(this->m->val.at(len-1) == 'I'))
{
QTC::TC("qpdf", "QPDFTokenizer inline image at EOF");
this->m->type = tt_inline_image;
this->m->state = st_token_ready;
}
}
if (this->m->state == st_literal)
{
QTC::TC("qpdf", "QPDF_Tokenizer EOF reading appendable token");
QTC::TC("qpdf", "QPDFTokenizer EOF reading appendable token");
resolveLiteral();
}
else if ((this->m->include_ignorable) && (this->m->state == st_in_space))
@ -514,7 +553,7 @@ QPDFTokenizer::presentEOF()
}
else if (this->m->state != st_token_ready)
{
QTC::TC("qpdf", "QPDF_Tokenizer EOF reading token");
QTC::TC("qpdf", "QPDFTokenizer EOF reading token");
this->m->type = tt_bad;
this->m->error_message = "EOF while reading token";
}
@ -522,6 +561,17 @@ QPDFTokenizer::presentEOF()
this->m->state = st_token_ready;
}
void
QPDFTokenizer::expectInlineImage()
{
if (this->m->state != st_top)
{
throw std::logic_error("QPDFTokenizer::expectInlineImage called"
" when tokenizer is in improper state");
}
this->m->state = st_inline_image;
}
bool
QPDFTokenizer::getToken(Token& token, bool& unread_char, char& ch)
{
@ -572,7 +622,7 @@ QPDFTokenizer::readToken(PointerHolder<InputSource> input,
presented_eof = true;
if ((this->m->type == tt_eof) && (! this->m->allow_eof))
{
QTC::TC("qpdf", "QPDF_Tokenizer EOF when not allowed");
QTC::TC("qpdf", "QPDFTokenizer EOF when not allowed");
this->m->type = tt_bad;
this->m->error_message = "unexpected EOF";
offset = input->getLastOffset();

View File

@ -64,11 +64,11 @@ QPDF stream length not integer 0
QPDF missing endstream 0
QPDFObjectHandle bad dictionary close 0
QPDF can't find xref 0
QPDF_Tokenizer bad ) 0
QPDF_Tokenizer bad > 0
QPDF_Tokenizer bad hexstring character 0
QPDF_Tokenizer null in name 0
QPDF_Tokenizer bad name 0
QPDFTokenizer bad ) 0
QPDFTokenizer bad > 0
QPDFTokenizer bad hexstring character 0
QPDFTokenizer null in name 0
QPDFTokenizer bad name 0
QPDF_Stream invalid filter 0
QPDF UseOutlines but no Outlines 0
QPDFObjectHandle clone bool 0
@ -233,8 +233,8 @@ QPDFWriter copy use_aes 1
QPDFObjectHandle indirect without context 0
QPDFObjectHandle trailing data in parse 0
qpdf pages encryption password 0
QPDF_Tokenizer EOF reading token 0
QPDF_Tokenizer EOF reading appendable token 0
QPDFTokenizer EOF reading token 0
QPDFTokenizer EOF reading appendable token 0
QPDFWriter extra header text no newline 0
QPDFWriter extra header text add newline 0
QPDF bogus 0 offset 0
@ -302,4 +302,5 @@ qpdf-c called qpdf_set_compress_streams 0
qpdf-c called qpdf_set_preserve_unreferenced_objects 0
qpdf-c called qpdf_set_newline_before_endstream 0
QPDF_Stream TIFF predictor 0
QPDF_Tokenizer EOF when not allowed 0
QPDFTokenizer EOF when not allowed 0
QPDFTokenizer inline image at EOF 0

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skipping to endstream
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8500: comment: %% Contents for page 11
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skipping to endstream
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8645: comment: %% Contents for page 10
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skipping to endstream
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9097: space: \x0a\x0a
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9113: space: \x0a
9114: comment: %%EOF
9119: space: \x0a
9120: eof
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8901: space: \x0a
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skipping to endstream
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9076: space:
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9112: string: \xed\xd6\x0f\xe8\xee\x87\xf8\x871\xa8o\x81\x9f\xe6Q\x99 (raw: <edd60fe8ee87f88731a86f819fe65199>)
9146: array_close: ]
9147: space: \x0a
9148: dict_close: >>
9150: space: \x0a
9151: word: stream
skipping to endstream
9399: word: endstream
9408: space: \x0a
9409: word: endobj
9415: space: \x0a\x0a
9417: word: startxref
9426: space: \x0a
9427: integer: 8991
9431: space: \x0a
9432: comment: %%EOF
9437: space: \x0a
9438: eof
--- END FILE ---
--- BEGIN PAGE 1 ---
0: word: BT
@ -595,9 +599,7 @@ skipping to endstream
103: dict_close: >>
105: space: \x0a
106: word: ID
skipping to EI
352: word: EI
354: space: \x0a
108: inline-image: x\x9c\xc5\xd6I\x0e\xc3 \x0c\x05P|\xffC;U\xc8`\xc0\xd37\x91Z\xa9\x0b\xa6\x17\x02\xc4\x98\xda\xe6\x8f\x1b}D\xf0\xef_\xb4\xf8\x1c\xc9W\xa9\x84\x9c\xc4-\x94\x88>\xff\x87\xc0\x8d>\x94^\x01&\xae\xa1u\xe2]\x80"!\x87\x95\x08\x96\x05*\xac&\x8fE|Sy\xae \xf0d-\x80<\x9d\x19B\x010B\x05\xfa@N\x11\xea+<\x1fhl\xe8K\xd0\xee/56L\xa0\x89\x90\xe3\x19\x1e \xa3\x96\xb9\xa6>0\x06>\x15Y\x81\xf9!c\xec\\x0eY\x0c\xd8\x0f%Y\xf0\x01\xa5\xd68?&\xa0\xd6\xeb\x88}j\x92\xfb\xe8\x1d;\xab\x8d3\x9d\xc2\xd6l\x14p\xdbsH\xf6\xfbt\xfa\x01Q\x02\xd8Tt*h\xccU\xfa\xe3w\x07\xcd\xd5\xd0%\xa8)p\x96\xb3"\x95DiRj\xb9\x96D\x18YNU\x11\xd3\xd9Av\x92F\xe0&\x0d\x90\xcd\xd4u#c\x95\xc6W\x09\xf4\xdf\x89\x03W\x93O\x0d\x0aEI\x0a
355: word: BT
357: space: \x0a
360: name: /F1
@ -743,13 +745,11 @@ skipping to EI
47: word: ET
49: space: \x0a\x00\x0a
52: name: /ThisMustBeLast
67: space: \x0a
68: eof
67: eof
--- END PAGE 5 ---
--- BEGIN PAGE 6 ---
0: word: ID
skipping to EI
EI not found
EI not found; resuming normal scanning
2: space: \x0a
5: name: /F1
8: space:
@ -772,27 +772,37 @@ EI not found
44: eof
--- END PAGE 6 ---
--- BEGIN PAGE 7 ---
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2: space: \x0a
5: name: /F1
8: space:
9: integer: 24
11: space:
12: word: Tf
14: space: \x0a
17: integer: 72
0: name: /potato
7: space: \x0a
8: word: BI
10: space: \x0a
11: name: /CS
14: space:
15: name: /G
17: name: /W
19: space:
20: integer: 720
23: space:
24: word: Td
26: space: \x0a
29: string: Potato (raw: (Potato))
37: space:
38: word: Tj
40: space: \x0a
41: word: ET
43: space: \x0a
44: eof
20: integer: 66
22: name: /H
24: space:
25: integer: 47
27: name: /BPC
31: space:
32: integer: 8
33: name: /F
35: name: /Fl
38: name: /DP
41: dict_open: <<
43: name: /Predictor
53: space:
54: integer: 15
56: name: /Columns
64: space:
65: integer: 66
67: dict_close: >>
69: space: \x0a
70: word: ID
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318: eof
--- END PAGE 7 ---
--- BEGIN PAGE 8 ---
0: word: BT

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@ -88,6 +88,8 @@ static char const* tokenTypeName(QPDFTokenizer::token_type_e ttype)
return "space";
case QPDFTokenizer::tt_comment:
return "comment";
case QPDFTokenizer::tt_inline_image:
return "inline-image";
}
return 0;
}
@ -131,7 +133,6 @@ dump_tokens(PointerHolder<InputSource> is, std::string const& label,
bool skip_streams, bool skip_inline_images)
{
Finder f1(is, "endstream");
Finder f2(is, "EI");
std::cout << "--- BEGIN " << label << " ---" << std::endl;
bool done = false;
QPDFTokenizer tokenizer;
@ -140,10 +141,20 @@ dump_tokens(PointerHolder<InputSource> is, std::string const& label,
{
tokenizer.includeIgnorable();
}
qpdf_offset_t inline_image_offset = 0;
while (! done)
{
QPDFTokenizer::Token token =
tokenizer.readToken(is, "test", true, max_len);
tokenizer.readToken(is, "test", true,
inline_image_offset ? 0 : max_len);
if (inline_image_offset && (token.getType() == QPDFTokenizer::tt_bad))
{
std::cout << "EI not found; resuming normal scanning" << std::endl;
is->seek(inline_image_offset, SEEK_SET);
inline_image_offset = 0;
continue;
}
inline_image_offset = 0;
qpdf_offset_t offset = is->getLastOffset();
std::cout << offset << ": "
@ -170,7 +181,8 @@ dump_tokens(PointerHolder<InputSource> is, std::string const& label,
else if (skip_inline_images &&
(token == QPDFTokenizer::Token(QPDFTokenizer::tt_word, "ID")))
{
try_skipping(tokenizer, is, max_len, "EI", f2);
tokenizer.expectInlineImage();
inline_image_offset = is->tell();
}
else if (token.getType() == QPDFTokenizer::tt_eof)
{