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Mst::loadXML(): Load the differential offset table.

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unescapeDiffOffTbl(): Unescape the XML-compatible differential offset
table and load it into a std::vector<uint8_t>.

TODO: Make use of the differential offset table in saveMST().
This commit is contained in:
David Korth 2019-05-27 20:08:21 -04:00
parent 0721a0213c
commit a6bcd60216
2 changed files with 87 additions and 2 deletions
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81
src/Mst.cpp
View File

@ -13,6 +13,7 @@
// C includes. (C++ namespace) // C includes. (C++ namespace)
#include <cassert> #include <cassert>
#include <cctype>
#include <cerrno> #include <cerrno>
#include <cstdio> #include <cstdio>
#include <cstring> #include <cstring>
@ -404,8 +405,6 @@ int Mst::loadXML(FILE *fp, std::vector<std::string> *pVecErrs)
return xml.ErrorID(); return xml.ErrorID();
} }
// TODO: Load m_vDiffOffTbl.
// Get the root element: "mst06" // Get the root element: "mst06"
XMLElement *const xml_mst06 = xml.FirstChildElement("mst06"); XMLElement *const xml_mst06 = xml.FirstChildElement("mst06");
if (!xml_mst06) { if (!xml_mst06) {
@ -559,6 +558,13 @@ int Mst::loadXML(FILE *fp, std::vector<std::string> *pVecErrs)
// TODO: Check for missing message indexes. // TODO: Check for missing message indexes.
// Load the differential offset table.
// TODO: Error message if not found?
XMLElement *const xml_diffOffTbl = xml_mst06->FirstChildElement("DiffOffTbl");
if (xml_diffOffTbl) {
unescapeDiffOffTbl(m_vDiffOffTbl, xml_diffOffTbl->GetText());
}
// Document processed. // Document processed.
return 0; return 0;
} }
@ -1167,3 +1173,74 @@ string Mst::escapeDiffOffTbl(const uint8_t *diffOffTbl, size_t len)
} }
return ret; return ret;
} }
/**
* Unescape an XML-compatible differential offset table.
* @param vDiffOffTbl [out] Vector for the unescaped table.
* @param s_diffOffTbl [in] Differential offset table string.
* @return 0 on success; non-zero on error.
*/
int Mst::unescapeDiffOffTbl(std::vector<uint8_t> &vDiffOffTbl, const char *s_diffOffTbl)
{
vDiffOffTbl.clear();
if (!s_diffOffTbl) {
return -EINVAL;
}
// TODO: Default reservation size instead of strlen()?
vDiffOffTbl.reserve(strlen(s_diffOffTbl));
for (; s_diffOffTbl[0] != '\0'; s_diffOffTbl++) {
// Check for an escape sequence.
if (s_diffOffTbl[0] == '\\') {
// Found a backslash.
switch (s_diffOffTbl[1]) {
case '\\':
vDiffOffTbl.push_back('\\');
s_diffOffTbl++;
break;
case 'n':
vDiffOffTbl.push_back('\n');
s_diffOffTbl++;
break;
case 'f':
vDiffOffTbl.push_back('\f');
s_diffOffTbl++;
break;
case 'x':
// Next two characters must be hexadecimal digits.
if (!isxdigit(s_diffOffTbl[2]) || !isxdigit(s_diffOffTbl[3])) {
// Invalid sequence.
// Skip over the "\\x" and continue.
// TODO: Return an error?
s_diffOffTbl++;
} else {
// Valid sequence. Convert to uint8_t.
char buf[3];
buf[0] = s_diffOffTbl[2];
buf[1] = s_diffOffTbl[3];
buf[2] = 0;
vDiffOffTbl.push_back(strtoul(buf, nullptr, 16));
s_diffOffTbl += 3;
}
break;
default:
// Unrecognized escape character.
// Handle the escape as a regular backslash.
// TODO: Return an error?
vDiffOffTbl.push_back('\\');
break;
}
} else {
// Regular character.
vDiffOffTbl.push_back(static_cast<uint8_t>(s_diffOffTbl[0]));
}
}
// Make sure the table is DWORD-aligned.
if (vDiffOffTbl.size() & 3) {
vDiffOffTbl.resize((vDiffOffTbl.size() + 4) & ~(3ULL));
}
return 0;
}

8
src/Mst.hpp
View File

@ -209,6 +209,14 @@ class Mst
*/ */
static std::string escapeDiffOffTbl(const uint8_t *diffTbl, size_t len); static std::string escapeDiffOffTbl(const uint8_t *diffTbl, size_t len);
/**
* Unescape an XML-compatible differential offset table.
* @param vDiffOffTbl [out] Vector for the unescaped table.
* @param s_diffOffTbl [in] Differential offset table string.
* @return 0 on success; non-zero on error.
*/
static int unescapeDiffOffTbl(std::vector<uint8_t> &vDiffOffTbl, const char *s_diffOffTbl);
private: private:
// MST information. // MST information.
char m_version; // MST version number. ('1') char m_version; // MST version number. ('1')