c744f5a467
git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@1437 8e941d3f-bd1b-0410-a28a-d453659cc2b4
134 lines
3.9 KiB
ObjectPascal
134 lines
3.9 KiB
ObjectPascal
{*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*}
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unit asset_manager;
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interface
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uses ctypes;
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type
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PAAssetManager = ^AAssetManager;
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AAssetManager = record end;
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AAssetDir = record end;
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AAsset = record end;
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PAAssetDir = ^AAssetDir;
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PAAsset = ^AAsset;
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Poff_t = ^coff_t;
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(* Available modes for opening assets *)
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const
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AASSET_MODE_UNKNOWN = 0;
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AASSET_MODE_RANDOM = 1;
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AASSET_MODE_STREAMING = 2;
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AASSET_MODE_BUFFER = 3;
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(**
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* Open the named directory within the asset hierarchy. The directory can then
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* be inspected with the AAssetDir functions. To open the top-level directory,
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* pass in "" as the dirName.
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*
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* The object returned here should be freed by calling AAssetDir_close().
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*)
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function AAssetManager_openDir(mgr: PAAssetManager; dirName: Pchar): PAAssetDir; cdecl; external;
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(**
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* Open an asset.
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*
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* The object returned here should be freed by calling AAsset_close().
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*)
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function AAssetManager_open(mgr: PAAssetManager; filename: Pchar; mode: cint): PAAsset; cdecl; external;
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(**
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* Iterate over the files in an asset directory. A NULL string is returned
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* when all the file names have been returned.
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*
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* The returned file name is suitable for passing to AAssetManager_open().
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*
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* The string returned here is owned by the AssetDir implementation and is not
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* guaranteed to remain valid if any other calls are made on this AAssetDir
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* instance.
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*)
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function AAssetDir_getNextFileName(assetDir: PAAssetDir): Pchar; cdecl; external;
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(**
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* Reset the iteration state of AAssetDir_getNextFileName() to the beginning.
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*)
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procedure AAssetDir_rewind(assetDir: PAAssetDir); cdecl; external;
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(**
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* Close an opened AAssetDir, freeing any related resources.
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*)
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procedure AAssetDir_close(assetDir: PAAssetDir); cdecl; external;
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(**
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* Attempt to read 'count' bytes of data from the current offset.
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*
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* Returns the number of bytes read, zero on EOF, or < 0 on error.
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*)
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function AAsset_read(asset: PAAsset; buf: Pointer; count: csize_t): cint; cdecl; external;
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(**
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* Seek to the specified offset within the asset data. 'whence' uses the
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* same constants as lseek()/fseek().
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*
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* Returns the new position on success, or (off_t) -1 on error.
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*)
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function AAsset_seek(asset: PAAsset; offset: coff_t; whence: cint): coff_t; cdecl; external;
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(**
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* Close the asset, freeing all associated resources.
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*)
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procedure AAsset_close(asset: PAAsset); cdecl; external;
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(**
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* Get a pointer to a buffer holding the entire contents of the assset.
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*
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* Returns NULL on failure.
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*)
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function AAsset_getBuffer(asset: PAAsset): Pointer; cdecl; external;
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(**
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* Report the total size of the asset data.
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*)
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function AAsset_getLength(asset: PAAsset): coff_t; cdecl; external;
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(**
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* Report the total amount of asset data that can be read from the current position.
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*)
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function AAsset_getRemainingLength(asset: PAAsset): coff_t; cdecl; external;
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(**
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* Open a new file descriptor that can be used to read the asset data.
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*
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* Returns < 0 if direct fd access is not possible (for example, if the asset is
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* compressed).
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*)
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function AAsset_openFileDescriptor(asset: PAAsset; outStart, outLength: Poff_t): cint; cdecl; external;
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(**
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* Returns whether this asset's internal buffer is allocated in ordinary RAM (i.e. not
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* mmapped).
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*)
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function AAsset_isAllocated(asset: PAAsset): cint; cdecl; external;
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implementation
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end.
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