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Fragmented FBX ASCII emdedded resource

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This commit is contained in:
Mike Samsonov
2019-05-14 14:43:16 +01:00
parent 524d8c281e
commit c84ac7a135
6 changed files with 812 additions and 41 deletions
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42
code/FBXMaterial.cpp
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@@ -326,16 +326,40 @@ Video::Video(uint64_t id, const Element& element, const Document& doc, const std
DOMError("embedded content is not surrounded by quotation marks", &element);
}
else {
const char* encodedData = data + 1;
size_t encodedDataLen = static_cast<size_t>(token.end() - token.begin());
// search for last quotation mark
while (encodedDataLen > 1 && encodedData[encodedDataLen] != '"')
encodedDataLen--;
if (encodedDataLen % 4 != 0) {
DOMError("embedded content is invalid, needs to be in base64", &element);
size_t targetLength = 0;
auto numTokens = Content->Tokens().size();
// First time compute size (it could be large like 64Gb and it is good to allocate it once)
for (uint32_t tokenIdx = 0; tokenIdx < numTokens; ++tokenIdx)
{
const Token& dataToken = GetRequiredToken(*Content, tokenIdx);
size_t tokenLength = dataToken.end() - dataToken.begin() - 2; // ignore double quotes
const char* base64data = dataToken.begin() + 1;
const size_t outLength = Util::ComputeDecodedSizeBase64(base64data, tokenLength);
if (outLength == 0)
{
DOMError("Corrupted embedded content found", &element);
}
targetLength += outLength;
}
else {
contentLength = Util::DecodeBase64(encodedData, encodedDataLen, content);
if (targetLength == 0)
{
DOMError("Corrupted embedded content found", &element);
}
content = new uint8_t[targetLength];
contentLength = static_cast<uint64_t>(targetLength);
size_t dst_offset = 0;
for (uint32_t tokenIdx = 0; tokenIdx < numTokens; ++tokenIdx)
{
const Token& dataToken = GetRequiredToken(*Content, tokenIdx);
size_t tokenLength = dataToken.end() - dataToken.begin() - 2; // ignore double quotes
const char* base64data = dataToken.begin() + 1;
dst_offset += Util::DecodeBase64(base64data, tokenLength, content + dst_offset, targetLength - dst_offset);
}
if (targetLength != dst_offset)
{
delete[] content;
contentLength = 0;
DOMError("Corrupted embedded content found", &element);
}
}
}