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Fix pdfioFileGetAuthor, etc. APIs (Issue #33)

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This commit is contained in:
Michael R Sweet
2022-07-12 18:36:08 -04:00
parent 26d485cfc5
commit a3f3bbfe11
4 changed files with 164 additions and 8 deletions
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29
pdfio-value.c
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@ -219,7 +219,6 @@ _pdfioValueRead(pdfio_file_t *pdf, // I - PDF file
PDFIO_DEBUG("_pdfioValueRead(pdf=%p, obj=%p, v=%p)\n", pdf, obj, v);
(void)obj; // TODO: Implement decryption
if (!_pdfioTokenGet(tb, token, sizeof(token)))
return (NULL);
@ -284,6 +283,7 @@ _pdfioValueRead(pdfio_file_t *pdf, // I - PDF file
}
}
}
if (token[i])
{
// Just a string...
@ -367,6 +367,33 @@ _pdfioValueRead(pdfio_file_t *pdf, // I - PDF file
*dataptr++ = (unsigned char)d;
}
if (obj && pdf->encryption)
{
// Decrypt the string...
_pdfio_crypto_ctx_t ctx; // Decryption context
_pdfio_crypto_cb_t cb; // Decryption callback
size_t ivlen; // Number of initialization vector bytes
uint8_t temp[32768]; // Temporary buffer for decryption
size_t templen; // Number of actual data bytes
if (v->value.binary.datalen > (sizeof(temp) - 32))
{
_pdfioFileError(pdf, "Unable to read encrypted binary string - too long.");
return (false);
}
cb = _pdfioCryptoMakeReader(pdf, obj, &ctx, v->value.binary.data, &ivlen);
templen = (cb)(&ctx, temp, v->value.binary.data + ivlen, v->value.binary.datalen - ivlen);
// Copy the decrypted string back to the value and adjust the length...
memcpy(v->value.binary.data, temp, templen);
if (pdf->encryption >= PDFIO_ENCRYPTION_AES_128)
v->value.binary.datalen = templen - temp[templen - 1];
else
v->value.binary.datalen = templen;
}
}
else if (strchr("0123456789-+.", token[0]) != NULL)
{