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Fix decryption of UTF-16 strings (Issue #42)

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Michael R Sweet
2025-04-13 09:05:02 -04:00
parent 20dd2a6d28
commit 2dcef0936e
5 changed files with 110 additions and 121 deletions
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21
pdfio-value.c
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@@ -205,7 +205,26 @@ _pdfioValueDecrypt(pdfio_file_t *pdf, // I - PDF file
temp[templen] = '\0';
if ((timeval = get_date_time((char *)temp)) != 0)
if ((templen & 1) == 0 && (!memcmp(temp, "\376\377", 2) || !memcmp(temp, "\377\376", 2)))
{
// Convert UTF-16 to UTF-8...
char utf8[4096]; // Temporary string
_pdfio_utf16cpy(utf8, temp, templen, sizeof(utf8));
if ((timeval = get_date_time((char *)utf8)) != 0)
{
// Change the type to date...
v->type = PDFIO_VALTYPE_DATE;
v->value.date = timeval;
}
else
{
// Copy the decrypted string back to the value...
v->value.string = pdfioStringCreate(pdf, utf8);
}
}
else if ((timeval = get_date_time((char *)temp)) != 0)
{
// Change the type to date...
v->type = PDFIO_VALTYPE_DATE;