mirror of
https://github.com/qpdf/qpdf.git
synced 2024-12-31 14:01:59 +00:00
Push QPDFTokenizer members into a nested structure
This is for protection against future ABI breaking changes.
This commit is contained in:
Jay Berkenbilt
parent
d97474868d
commit
2699ecf13e
@ -165,31 +165,53 @@ class QPDFTokenizer
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size_t max_len = 0);
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private:
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void reset();
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// Do not implement copy or assignment
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QPDFTokenizer(QPDFTokenizer const&);
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QPDFTokenizer& operator=(QPDFTokenizer const&);
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void resolveLiteral();
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bool isSpace(char);
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// Lexer state
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enum { st_top, st_in_space, st_in_comment, st_in_string, st_lt, st_gt,
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st_literal, st_in_hexstring, st_token_ready } state;
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enum state_e {
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st_top, st_in_space, st_in_comment, st_in_string, st_lt, st_gt,
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st_literal, st_in_hexstring, st_token_ready
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};
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bool pound_special_in_name;
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bool allow_eof;
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bool include_ignorable;
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class Members
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{
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friend class QPDFTokenizer;
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// Current token accumulation
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token_type_e type;
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std::string val;
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std::string raw_val;
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std::string error_message;
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bool unread_char;
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char char_to_unread;
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public:
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QPDF_DLL
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~Members();
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// State for strings
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int string_depth;
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bool string_ignoring_newline;
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char bs_num_register[4];
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bool last_char_was_bs;
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private:
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Members();
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Members(Members const&);
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void reset();
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// Lexer state
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state_e state;
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bool pound_special_in_name;
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bool allow_eof;
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bool include_ignorable;
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// Current token accumulation
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token_type_e type;
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std::string val;
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std::string raw_val;
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std::string error_message;
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bool unread_char;
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char char_to_unread;
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// State for strings
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int string_depth;
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bool string_ignoring_newline;
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char bs_num_register[4];
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bool last_char_was_bs;
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};
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PointerHolder<Members> m;
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};
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#endif // __QPDFTOKENIZER_HH__
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@ -12,7 +12,7 @@
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#include <string.h>
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#include <cstdlib>
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QPDFTokenizer::QPDFTokenizer() :
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QPDFTokenizer::Members::Members() :
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pound_special_in_name(true),
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allow_eof(false),
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include_ignorable(false)
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@ -21,32 +21,7 @@ QPDFTokenizer::QPDFTokenizer() :
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}
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void
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QPDFTokenizer::allowPoundAnywhereInName()
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{
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QTC::TC("qpdf", "QPDFTokenizer allow pound anywhere in name");
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this->pound_special_in_name = false;
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}
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void
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QPDFTokenizer::allowEOF()
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{
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this->allow_eof = true;
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}
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void
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QPDFTokenizer::includeIgnorable()
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{
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this->include_ignorable = true;
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}
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bool
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QPDFTokenizer::isSpace(char ch)
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{
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return ((ch == '\0') || QUtil::is_space(ch));
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}
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void
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QPDFTokenizer::reset()
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QPDFTokenizer::Members::reset()
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{
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state = st_top;
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type = tt_bad;
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@ -60,20 +35,54 @@ QPDFTokenizer::reset()
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last_char_was_bs = false;
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}
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QPDFTokenizer::Members::~Members()
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{
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}
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QPDFTokenizer::QPDFTokenizer() :
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m(new Members())
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{
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}
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void
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QPDFTokenizer::allowPoundAnywhereInName()
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{
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QTC::TC("qpdf", "QPDFTokenizer allow pound anywhere in name");
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this->m->pound_special_in_name = false;
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}
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void
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QPDFTokenizer::allowEOF()
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{
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this->m->allow_eof = true;
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}
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void
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QPDFTokenizer::includeIgnorable()
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{
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this->m->include_ignorable = true;
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}
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bool
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QPDFTokenizer::isSpace(char ch)
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{
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return ((ch == '\0') || QUtil::is_space(ch));
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}
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void
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QPDFTokenizer::resolveLiteral()
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{
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if ((val.length() > 0) && (val.at(0) == '/'))
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if ((this->m->val.length() > 0) && (this->m->val.at(0) == '/'))
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{
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type = tt_name;
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this->m->type = tt_name;
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// Deal with # in name token. Note: '/' by itself is a
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// valid name, so don't strip leading /. That way we
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// don't have to deal with the empty string as a name.
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std::string nval = "/";
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char const* valstr = val.c_str() + 1;
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char const* valstr = this->m->val.c_str() + 1;
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for (char const* p = valstr; *p; ++p)
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{
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if ((*p == '#') && this->pound_special_in_name)
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if ((*p == '#') && this->m->pound_special_in_name)
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{
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if (p[1] && p[2] &&
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QUtil::is_hex_digit(p[1]) && QUtil::is_hex_digit(p[2]))
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@ -85,9 +94,9 @@ QPDFTokenizer::resolveLiteral()
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char ch = static_cast<char>(strtol(num, 0, 16));
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if (ch == '\0')
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{
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type = tt_bad;
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this->m->type = tt_bad;
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QTC::TC("qpdf", "QPDF_Tokenizer null in name");
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error_message =
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this->m->error_message =
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"null character not allowed in name token";
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nval += "#00";
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}
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@ -100,8 +109,8 @@ QPDFTokenizer::resolveLiteral()
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else
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{
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QTC::TC("qpdf", "QPDF_Tokenizer bad name");
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type = tt_bad;
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error_message = "invalid name token";
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this->m->type = tt_bad;
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this->m->error_message = "invalid name token";
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nval += *p;
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}
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}
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@ -110,40 +119,40 @@ QPDFTokenizer::resolveLiteral()
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nval += *p;
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}
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}
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val = nval;
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this->m->val = nval;
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}
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else if (QUtil::is_number(val.c_str()))
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else if (QUtil::is_number(this->m->val.c_str()))
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{
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if (val.find('.') != std::string::npos)
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if (this->m->val.find('.') != std::string::npos)
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{
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type = tt_real;
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this->m->type = tt_real;
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}
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else
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{
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type = tt_integer;
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this->m->type = tt_integer;
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}
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}
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else if ((val == "true") || (val == "false"))
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else if ((this->m->val == "true") || (this->m->val == "false"))
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{
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type = tt_bool;
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this->m->type = tt_bool;
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}
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else if (val == "null")
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else if (this->m->val == "null")
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{
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type = tt_null;
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this->m->type = tt_null;
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}
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else
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{
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// I don't really know what it is, so leave it as tt_word.
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// Lots of cases ($, #, etc.) other than actual words fall
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// into this category, but that's okay at least for now.
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type = tt_word;
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this->m->type = tt_word;
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}
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}
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void
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QPDFTokenizer::presentCharacter(char ch)
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{
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if (state == st_token_ready)
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if (this->m->state == st_token_ready)
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{
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throw std::logic_error(
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"INTERNAL ERROR: QPDF tokenizer presented character "
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@ -157,205 +166,210 @@ QPDFTokenizer::presentCharacter(char ch)
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// the character that caused a state change in the new state.
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bool handled = true;
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if (state == st_top)
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if (this->m->state == st_top)
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{
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// Note: we specifically do not use ctype here. It is
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// locale-dependent.
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if (isSpace(ch))
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{
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if (this->include_ignorable)
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if (this->m->include_ignorable)
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{
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state = st_in_space;
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val += ch;
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this->m->state = st_in_space;
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this->m->val += ch;
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}
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}
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else if (ch == '%')
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{
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state = st_in_comment;
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if (this->include_ignorable)
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this->m->state = st_in_comment;
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if (this->m->include_ignorable)
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{
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val += ch;
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this->m->val += ch;
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}
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}
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else if (ch == '(')
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{
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string_depth = 1;
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string_ignoring_newline = false;
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memset(bs_num_register, '\0', sizeof(bs_num_register));
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last_char_was_bs = false;
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state = st_in_string;
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this->m->string_depth = 1;
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this->m->string_ignoring_newline = false;
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memset(this->m->bs_num_register, '\0',
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sizeof(this->m->bs_num_register));
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this->m->last_char_was_bs = false;
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this->m->state = st_in_string;
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}
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else if (ch == '<')
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{
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state = st_lt;
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this->m->state = st_lt;
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}
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else if (ch == '>')
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{
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state = st_gt;
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this->m->state = st_gt;
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}
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else
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{
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val += ch;
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this->m->val += ch;
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if (ch == ')')
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{
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type = tt_bad;
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this->m->type = tt_bad;
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QTC::TC("qpdf", "QPDF_Tokenizer bad )");
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error_message = "unexpected )";
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state = st_token_ready;
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this->m->error_message = "unexpected )";
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this->m->state = st_token_ready;
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}
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else if (ch == '[')
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{
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type = tt_array_open;
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state = st_token_ready;
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this->m->type = tt_array_open;
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this->m->state = st_token_ready;
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}
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else if (ch == ']')
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{
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type = tt_array_close;
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state = st_token_ready;
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this->m->type = tt_array_close;
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this->m->state = st_token_ready;
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}
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else if (ch == '{')
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{
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type = tt_brace_open;
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state = st_token_ready;
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this->m->type = tt_brace_open;
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this->m->state = st_token_ready;
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}
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else if (ch == '}')
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{
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type = tt_brace_close;
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state = st_token_ready;
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this->m->type = tt_brace_close;
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this->m->state = st_token_ready;
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}
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else
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{
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state = st_literal;
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this->m->state = st_literal;
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}
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}
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}
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else if (state == st_in_space)
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else if (this->m->state == st_in_space)
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{
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// We only enter this state if include_ignorable is true.
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if (! isSpace(ch))
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{
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type = tt_space;
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unread_char = true;
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char_to_unread = ch;
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state = st_token_ready;
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this->m->type = tt_space;
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this->m->unread_char = true;
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this->m->char_to_unread = ch;
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this->m->state = st_token_ready;
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}
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else
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{
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val += ch;
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this->m->val += ch;
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}
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}
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else if (state == st_in_comment)
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else if (this->m->state == st_in_comment)
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{
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if ((ch == '\r') || (ch == '\n'))
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{
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if (this->include_ignorable)
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if (this->m->include_ignorable)
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{
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type = tt_comment;
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unread_char = true;
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char_to_unread = ch;
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state = st_token_ready;
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this->m->type = tt_comment;
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this->m->unread_char = true;
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this->m->char_to_unread = ch;
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this->m->state = st_token_ready;
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}
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else
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{
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state = st_top;
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this->m->state = st_top;
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}
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}
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else if (this->include_ignorable)
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else if (this->m->include_ignorable)
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{
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val += ch;
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this->m->val += ch;
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}
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}
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else if (state == st_lt)
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else if (this->m->state == st_lt)
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{
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if (ch == '<')
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{
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val = "<<";
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type = tt_dict_open;
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state = st_token_ready;
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this->m->val = "<<";
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this->m->type = tt_dict_open;
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this->m->state = st_token_ready;
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}
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else
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{
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handled = false;
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state = st_in_hexstring;
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this->m->state = st_in_hexstring;
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}
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}
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else if (state == st_gt)
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else if (this->m->state == st_gt)
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{
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if (ch == '>')
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{
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val = ">>";
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type = tt_dict_close;
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state = st_token_ready;
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this->m->val = ">>";
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this->m->type = tt_dict_close;
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this->m->state = st_token_ready;
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}
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else
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{
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val = ">";
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type = tt_bad;
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this->m->val = ">";
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this->m->type = tt_bad;
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QTC::TC("qpdf", "QPDF_Tokenizer bad >");
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error_message = "unexpected >";
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unread_char = true;
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char_to_unread = ch;
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state = st_token_ready;
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this->m->error_message = "unexpected >";
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this->m->unread_char = true;
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this->m->char_to_unread = ch;
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this->m->state = st_token_ready;
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}
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}
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else if (state == st_in_string)
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else if (this->m->state == st_in_string)
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{
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if (string_ignoring_newline && (! ((ch == '\r') || (ch == '\n'))))
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if (this->m->string_ignoring_newline &&
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(! ((ch == '\r') || (ch == '\n'))))
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{
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string_ignoring_newline = false;
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this->m->string_ignoring_newline = false;
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}
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size_t bs_num_count = strlen(bs_num_register);
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size_t bs_num_count = strlen(this->m->bs_num_register);
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bool ch_is_octal = ((ch >= '0') && (ch <= '7'));
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if ((bs_num_count == 3) || ((bs_num_count > 0) && (! ch_is_octal)))
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{
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// We've accumulated \ddd. PDF Spec says to ignore
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// high-order overflow.
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val += static_cast<char>(strtol(bs_num_register, 0, 8));
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memset(bs_num_register, '\0', sizeof(bs_num_register));
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this->m->val += static_cast<char>(
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strtol(this->m->bs_num_register, 0, 8));
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memset(this->m->bs_num_register, '\0',
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sizeof(this->m->bs_num_register));
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bs_num_count = 0;
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}
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if (string_ignoring_newline && ((ch == '\r') || (ch == '\n')))
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if (this->m->string_ignoring_newline && ((ch == '\r') || (ch == '\n')))
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{
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// ignore
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}
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else if (ch_is_octal && (last_char_was_bs || (bs_num_count > 0)))
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else if (ch_is_octal &&
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(this->m->last_char_was_bs || (bs_num_count > 0)))
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{
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bs_num_register[bs_num_count++] = ch;
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this->m->bs_num_register[bs_num_count++] = ch;
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}
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else if (last_char_was_bs)
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else if (this->m->last_char_was_bs)
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{
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switch (ch)
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{
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case 'n':
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val += '\n';
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this->m->val += '\n';
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break;
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||||
|
||||
case 'r':
|
||||
val += '\r';
|
||||
this->m->val += '\r';
|
||||
break;
|
||||
|
||||
case 't':
|
||||
val += '\t';
|
||||
this->m->val += '\t';
|
||||
break;
|
||||
|
||||
case 'b':
|
||||
val += '\b';
|
||||
this->m->val += '\b';
|
||||
break;
|
||||
|
||||
case 'f':
|
||||
val += '\f';
|
||||
this->m->val += '\f';
|
||||
break;
|
||||
|
||||
case '\r':
|
||||
case '\n':
|
||||
string_ignoring_newline = true;
|
||||
this->m->string_ignoring_newline = true;
|
||||
break;
|
||||
|
||||
default:
|
||||
// PDF spec says backslash is ignored before anything else
|
||||
val += ch;
|
||||
this->m->val += ch;
|
||||
break;
|
||||
}
|
||||
}
|
||||
@ -371,22 +385,23 @@ QPDFTokenizer::presentCharacter(char ch)
|
||||
}
|
||||
else if (ch == '(')
|
||||
{
|
||||
val += ch;
|
||||
++string_depth;
|
||||
this->m->val += ch;
|
||||
++this->m->string_depth;
|
||||
}
|
||||
else if ((ch == ')') && (--string_depth == 0))
|
||||
else if ((ch == ')') && (--this->m->string_depth == 0))
|
||||
{
|
||||
type = tt_string;
|
||||
state = st_token_ready;
|
||||
this->m->type = tt_string;
|
||||
this->m->state = st_token_ready;
|
||||
}
|
||||
else
|
||||
{
|
||||
val += ch;
|
||||
this->m->val += ch;
|
||||
}
|
||||
|
||||
last_char_was_bs = ((! last_char_was_bs) && (ch == '\\'));
|
||||
this->m->last_char_was_bs =
|
||||
((! this->m->last_char_was_bs) && (ch == '\\'));
|
||||
}
|
||||
else if (state == st_literal)
|
||||
else if (this->m->state == st_literal)
|
||||
{
|
||||
if (strchr(" \t\n\v\f\r()<>[]{}/%", ch) != 0)
|
||||
{
|
||||
@ -398,14 +413,14 @@ QPDFTokenizer::presentCharacter(char ch)
|
||||
// though not on any files in the test suite as of this
|
||||
// writing.
|
||||
|
||||
type = tt_word;
|
||||
unread_char = true;
|
||||
char_to_unread = ch;
|
||||
state = st_token_ready;
|
||||
this->m->type = tt_word;
|
||||
this->m->unread_char = true;
|
||||
this->m->char_to_unread = ch;
|
||||
this->m->state = st_token_ready;
|
||||
}
|
||||
else
|
||||
{
|
||||
val += ch;
|
||||
this->m->val += ch;
|
||||
}
|
||||
}
|
||||
else
|
||||
@ -418,33 +433,33 @@ QPDFTokenizer::presentCharacter(char ch)
|
||||
{
|
||||
// okay
|
||||
}
|
||||
else if (state == st_in_hexstring)
|
||||
else if (this->m->state == st_in_hexstring)
|
||||
{
|
||||
if (ch == '>')
|
||||
{
|
||||
type = tt_string;
|
||||
state = st_token_ready;
|
||||
if (val.length() % 2)
|
||||
this->m->type = tt_string;
|
||||
this->m->state = st_token_ready;
|
||||
if (this->m->val.length() % 2)
|
||||
{
|
||||
// PDF spec says odd hexstrings have implicit
|
||||
// trailing 0.
|
||||
val += '0';
|
||||
this->m->val += '0';
|
||||
}
|
||||
char num[3];
|
||||
num[2] = '\0';
|
||||
std::string nval;
|
||||
for (unsigned int i = 0; i < val.length(); i += 2)
|
||||
for (unsigned int i = 0; i < this->m->val.length(); i += 2)
|
||||
{
|
||||
num[0] = val.at(i);
|
||||
num[1] = val.at(i+1);
|
||||
num[0] = this->m->val.at(i);
|
||||
num[1] = this->m->val.at(i+1);
|
||||
char nch = static_cast<char>(strtol(num, 0, 16));
|
||||
nval += nch;
|
||||
}
|
||||
val = nval;
|
||||
this->m->val = nval;
|
||||
}
|
||||
else if (QUtil::is_hex_digit(ch))
|
||||
{
|
||||
val += ch;
|
||||
this->m->val += ch;
|
||||
}
|
||||
else if (isSpace(ch))
|
||||
{
|
||||
@ -452,11 +467,11 @@ QPDFTokenizer::presentCharacter(char ch)
|
||||
}
|
||||
else
|
||||
{
|
||||
type = tt_bad;
|
||||
this->m->type = tt_bad;
|
||||
QTC::TC("qpdf", "QPDF_Tokenizer bad hexstring character");
|
||||
error_message = std::string("invalid character (") +
|
||||
this->m->error_message = std::string("invalid character (") +
|
||||
ch + ") in hexstring";
|
||||
state = st_token_ready;
|
||||
this->m->state = st_token_ready;
|
||||
}
|
||||
}
|
||||
else
|
||||
@ -465,61 +480,63 @@ QPDFTokenizer::presentCharacter(char ch)
|
||||
"INTERNAL ERROR: invalid state while reading token");
|
||||
}
|
||||
|
||||
if ((state == st_token_ready) && (type == tt_word))
|
||||
if ((this->m->state == st_token_ready) && (this->m->type == tt_word))
|
||||
{
|
||||
resolveLiteral();
|
||||
}
|
||||
|
||||
if (! (betweenTokens() || ((state == st_token_ready) && unread_char)))
|
||||
if (! (betweenTokens() ||
|
||||
((this->m->state == st_token_ready) && this->m->unread_char)))
|
||||
{
|
||||
this->raw_val += orig_ch;
|
||||
this->m->raw_val += orig_ch;
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
QPDFTokenizer::presentEOF()
|
||||
{
|
||||
if (state == st_literal)
|
||||
if (this->m->state == st_literal)
|
||||
{
|
||||
QTC::TC("qpdf", "QPDF_Tokenizer EOF reading appendable token");
|
||||
resolveLiteral();
|
||||
}
|
||||
else if ((this->include_ignorable) && (state == st_in_space))
|
||||
else if ((this->m->include_ignorable) && (this->m->state == st_in_space))
|
||||
{
|
||||
type = tt_space;
|
||||
this->m->type = tt_space;
|
||||
}
|
||||
else if ((this->include_ignorable) && (state == st_in_comment))
|
||||
else if ((this->m->include_ignorable) && (this->m->state == st_in_comment))
|
||||
{
|
||||
type = tt_comment;
|
||||
this->m->type = tt_comment;
|
||||
}
|
||||
else if (betweenTokens())
|
||||
{
|
||||
type = tt_eof;
|
||||
this->m->type = tt_eof;
|
||||
}
|
||||
else if (state != st_token_ready)
|
||||
else if (this->m->state != st_token_ready)
|
||||
{
|
||||
QTC::TC("qpdf", "QPDF_Tokenizer EOF reading token");
|
||||
type = tt_bad;
|
||||
error_message = "EOF while reading token";
|
||||
this->m->type = tt_bad;
|
||||
this->m->error_message = "EOF while reading token";
|
||||
}
|
||||
|
||||
state = st_token_ready;
|
||||
this->m->state = st_token_ready;
|
||||
}
|
||||
|
||||
bool
|
||||
QPDFTokenizer::getToken(Token& token, bool& unread_char, char& ch)
|
||||
{
|
||||
bool ready = (this->state == st_token_ready);
|
||||
unread_char = this->unread_char;
|
||||
ch = this->char_to_unread;
|
||||
bool ready = (this->m->state == st_token_ready);
|
||||
unread_char = this->m->unread_char;
|
||||
ch = this->m->char_to_unread;
|
||||
if (ready)
|
||||
{
|
||||
if (type == tt_bad)
|
||||
if (this->m->type == tt_bad)
|
||||
{
|
||||
val = raw_val;
|
||||
this->m->val = this->m->raw_val;
|
||||
}
|
||||
token = Token(type, val, raw_val, error_message);
|
||||
reset();
|
||||
token = Token(this->m->type, this->m->val,
|
||||
this->m->raw_val, this->m->error_message);
|
||||
this->m->reset();
|
||||
}
|
||||
return ready;
|
||||
}
|
||||
@ -527,10 +544,10 @@ QPDFTokenizer::getToken(Token& token, bool& unread_char, char& ch)
|
||||
bool
|
||||
QPDFTokenizer::betweenTokens()
|
||||
{
|
||||
return ((state == st_top) ||
|
||||
((! this->include_ignorable) &&
|
||||
((state == st_in_comment) ||
|
||||
(state == st_in_space))));
|
||||
return ((this->m->state == st_top) ||
|
||||
((! this->m->include_ignorable) &&
|
||||
((this->m->state == st_in_comment) ||
|
||||
(this->m->state == st_in_space))));
|
||||
}
|
||||
|
||||
QPDFTokenizer::Token
|
||||
@ -553,11 +570,11 @@ QPDFTokenizer::readToken(PointerHolder<InputSource> input,
|
||||
{
|
||||
presentEOF();
|
||||
presented_eof = true;
|
||||
if ((type == tt_eof) && (! this->allow_eof))
|
||||
if ((this->m->type == tt_eof) && (! this->m->allow_eof))
|
||||
{
|
||||
QTC::TC("qpdf", "QPDF_Tokenizer EOF when not allowed");
|
||||
type = tt_bad;
|
||||
error_message = "unexpected EOF";
|
||||
this->m->type = tt_bad;
|
||||
this->m->error_message = "unexpected EOF";
|
||||
offset = input->getLastOffset();
|
||||
}
|
||||
}
|
||||
@ -574,14 +591,14 @@ QPDFTokenizer::readToken(PointerHolder<InputSource> input,
|
||||
{
|
||||
++offset;
|
||||
}
|
||||
if (max_len && (raw_val.length() >= max_len) &&
|
||||
(this->state != st_token_ready))
|
||||
if (max_len && (this->m->raw_val.length() >= max_len) &&
|
||||
(this->m->state != st_token_ready))
|
||||
{
|
||||
// terminate this token now
|
||||
QTC::TC("qpdf", "QPDFTokenizer block long token");
|
||||
this->type = tt_bad;
|
||||
this->state = st_token_ready;
|
||||
error_message =
|
||||
this->m->type = tt_bad;
|
||||
this->m->state = st_token_ready;
|
||||
this->m->error_message =
|
||||
"exceeded allowable length while reading token";
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user