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TSAGE: Implemented method for getting a resource section entry

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This will be needed for streaming data directly from the resource file without fully loading the resource.
This commit is contained in:
Paul Gilbert 2012-02-20 22:30:46 +11:00
parent d77253fbe5
commit 0f3614b043
2 changed files with 56 additions and 11 deletions
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62
engines/tsage/resources.cpp
View File

@ -135,7 +135,7 @@ uint16 BitReader::readToken() {
/*-------------------------------------------------------------------------*/
TLib::TLib(MemoryManager &memManager, const Common::String &filename) :
_memoryManager(memManager) {
_filename(filename), _memoryManager(memManager) {
// If the resource strings list isn't yet loaded, load them
if (_resStrings.size() == 0) {
@ -158,25 +158,35 @@ TLib::~TLib() {
_resStrings.clear();
}
/**
* Load a section index from the given position in the file
*/
void TLib::loadSection(uint32 fileOffset) {
_resources.clear();
_file.seek(fileOffset);
_sections.fileOffset = fileOffset;
if (_file.readUint32BE() != 0x544D492D)
loadSection(_file, _resources);
}
/**
* Inner logic for decoding a section index into a passed resource list object
*/
void TLib::loadSection(Common::File &f, ResourceList &resources) {
if (f.readUint32BE() != 0x544D492D)
error("Data block is not valid Rlb data");
/*uint8 unknown1 = */_file.readByte();
uint16 numEntries = _file.readByte();
/*uint8 unknown1 = */f.readByte();
uint16 numEntries = f.readByte();
for (uint i = 0; i < numEntries; ++i) {
uint16 id = _file.readUint16LE();
uint16 size = _file.readUint16LE();
uint16 uncSize = _file.readUint16LE();
uint8 sizeHi = _file.readByte();
uint8 type = _file.readByte() >> 5;
uint16 id = f.readUint16LE();
uint16 size = f.readUint16LE();
uint16 uncSize = f.readUint16LE();
uint8 sizeHi = f.readByte();
uint8 type = f.readByte() >> 5;
assert(type <= 1);
uint32 offset = _file.readUint32LE();
uint32 offset = f.readUint32LE();
ResourceEntry re;
re.id = id;
@ -185,7 +195,7 @@ void TLib::loadSection(uint32 fileOffset) {
re.size = ((sizeHi & 0xF) << 16) | size;
re.uncompressedSize = ((sizeHi & 0xF0) << 12) | uncSize;
_resources.push_back(re);
resources.push_back(re);
}
}
@ -443,6 +453,36 @@ bool TLib::getMessage(int resNum, int lineNum, Common::String &result, bool supp
/*--------------------------------------------------------------------------*/
/**
* Open up the main resource file and get an entry from the root section
*/
bool TLib::getSectionEntry(Common::File &f, ResourceType resType, int rlbNum, int resNum,
ResourceEntry &resEntry) {
// Try and open the resource file
if (!f.open(_filename))
return false;
// Load the root section index
ResourceList resList;
loadSection(f, resList);
// Loop through the index for the desired entry
ResourceList::iterator iter;
for (iter = _resources.begin(); iter != _resources.end(); ++iter) {
ResourceEntry &re = *iter;
if (re.id == resNum) {
// Found it, so exit
resEntry = re;
return true;
}
}
// No matching entry found
return false;
}
/*--------------------------------------------------------------------------*/
ResourceManager::~ResourceManager() {
for (uint idx = 0; idx < _libList.size(); ++idx)
delete _libList[idx];

5
engines/tsage/resources.h
View File

@ -145,10 +145,12 @@ private:
MemoryManager &_memoryManager;
private:
Common::File _file;
Common::String _filename;
ResourceList _resources;
SectionList _sections;
void loadSection(uint32 fileOffset);
void loadSection(Common::File &f, ResourceList &resources);
void loadIndex();
public:
TLib(MemoryManager &memManager, const Common::String &filename);
@ -159,6 +161,8 @@ public:
bool getPalette(int paletteNum, byte *palData, uint *startNum, uint *numEntries);
byte *getSubResource(int resNum, int rlbNum, int index, uint *size, bool suppressErrors = false);
bool getMessage(int resNum, int lineNum, Common::String &result, bool suppressErrors = false);
bool getSectionEntry(Common::File &f, ResourceType resType, int rlbNum, int resNum, ResourceEntry &resEntry);
};
class ResourceManager {
@ -174,6 +178,7 @@ public:
void getPalette(int paletteNum, byte *palData, uint *startNum, uint *numEntries, bool suppressErrors = false);
byte *getSubResource(int resNum, int rlbNum, int index, uint *size, bool suppressErrors = false);
Common::String getMessage(int resNum, int lineNum, bool suppressErrors = false);
TLib &first() { return **_libList.begin(); }
};