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Adapt MemoryIOSystem to delegate unhandled calls to shadowed IO system

pull/2306/head
Adrian Perez 2019-01-18 16:43:39 -08:00
parent 40a1c1ed07
commit 8191080986
2 changed files with 25 additions and 14 deletions
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2
code/Importer.cpp
View File

@ -483,7 +483,7 @@ const aiScene* Importer::ReadFileFromMemory( const void* pBuffer,
IOSystem* io = pimpl->mIOHandler;
pimpl->mIOHandler = NULL;
SetIOHandler(new MemoryIOSystem((const uint8_t*)pBuffer,pLength));
SetIOHandler(new MemoryIOSystem((const uint8_t*)pBuffer,pLength,io));
// read the file and recover the previous IOSystem
static const size_t BufSize(Importer::MaxLenHint + 28);

35
include/assimp/MemoryIOWrapper.h
View File

@ -151,9 +151,8 @@ class MemoryIOSystem : public IOSystem
{
public:
/** Constructor. */
MemoryIOSystem (const uint8_t* buff, size_t len)
: buffer (buff), length(len) {
}
MemoryIOSystem(const uint8_t* buff, size_t len, IOSystem* io)
: buffer(buff), length(len), existing_io(io), created_stream(NULL) {}
/** Destructor. */
~MemoryIOSystem() {
@ -161,40 +160,52 @@ public:
// -------------------------------------------------------------------
/** Tests for the existence of a file at the given path. */
bool Exists( const char* pFile) const {
return !strncmp(pFile,AI_MEMORYIO_MAGIC_FILENAME,AI_MEMORYIO_MAGIC_FILENAME_LENGTH);
bool Exists(const char* pFile) const {
if (!strncmp(pFile,AI_MEMORYIO_MAGIC_FILENAME,AI_MEMORYIO_MAGIC_FILENAME_LENGTH)) {
return true;
}
return existing_io ? existing_io->Exists(pFile) : false;
}
// -------------------------------------------------------------------
/** Returns the directory separator. */
char getOsSeparator() const {
return '/'; // why not? it doesn't care
return existing_io ? existing_io->getOsSeparator()
: '/'; // why not? it doesn't care
}
// -------------------------------------------------------------------
/** Open a new file with a given path. */
IOStream* Open( const char* pFile, const char* /*pMode*/ = "rb") {
if (strncmp(pFile,AI_MEMORYIO_MAGIC_FILENAME,AI_MEMORYIO_MAGIC_FILENAME_LENGTH)) {
return NULL;
IOStream* Open(const char* pFile, const char* pMode = "rb") {
if (!strncmp(pFile,AI_MEMORYIO_MAGIC_FILENAME,AI_MEMORYIO_MAGIC_FILENAME_LENGTH)) {
created_stream = new MemoryIOStream(buffer, length);
return created_stream;
}
return new MemoryIOStream(buffer,length);
return existing_io ? existing_io->Open(pFile, pMode) : NULL;
}
// -------------------------------------------------------------------
/** Closes the given file and releases all resources associated with it. */
void Close( IOStream* pFile) {
if (pFile == created_stream) {
delete pFile;
created_stream = NULL;
} else if (existing_io) {
existing_io->Close(pFile);
}
}
// -------------------------------------------------------------------
/** Compare two paths */
bool ComparePaths (const char* /*one*/, const char* /*second*/) const {
return false;
bool ComparePaths(const char* one, const char* second) const {
return existing_io ? existing_io->ComparePaths(one, second) : false;
}
private:
const uint8_t* buffer;
size_t length;
IOSystem* existing_io;
IOStream* created_stream;
};
} // end namespace Assimp