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< title > 1.8.3 Manual< / title >
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< / head >
< body >
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< h1 > 1.8.3 Manual< / h1 >
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< hr >
< a name = "Contents" > < / a > < h2 > Contents< / h2 >
< ol >
< li > < a href = "#Chapter1" > Introduction< / a > < / li >
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< li > < a href = "#Chapter2" > Compiler specifics< / a > < / li >
< li > < a href = "#Chapter3" > Error management< / a > < / li >
< li > < a href = "#Chapter4" > Frame compression types< / a > < / li >
< li > < a href = "#Chapter5" > Simple compression function< / a > < / li >
< li > < a href = "#Chapter6" > Advanced compression functions< / a > < / li >
< li > < a href = "#Chapter7" > Resource Management< / a > < / li >
< li > < a href = "#Chapter8" > Compression< / a > < / li >
< li > < a href = "#Chapter9" > Decompression functions< / a > < / li >
< li > < a href = "#Chapter10" > Streaming decompression functions< / a > < / li >
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< li > < a href = "#Chapter11" > Bulk processing dictionary API< / a > < / li >
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< / ol >
< hr >
< a name = "Chapter1" > < / a > < h2 > Introduction< / h2 > < pre >
lz4frame.h implements LZ4 frame specification (doc/lz4_Frame_format.md).
lz4frame.h provides frame compression functions that take care
of encoding standard metadata alongside LZ4-compressed blocks.
< BR > < / pre >
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< a name = "Chapter2" > < / a > < h2 > Compiler specifics< / h2 > < pre > < / pre >
< a name = "Chapter3" > < / a > < h2 > Error management< / h2 > < pre > < / pre >
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< pre > < b > unsigned LZ4F_isError(LZ4F_errorCode_t code); < / b > /**< tells when a function result is an error code * / < b >
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< / b > < / pre > < BR >
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< pre > < b > const char* LZ4F_getErrorName(LZ4F_errorCode_t code); < / b > /**< return error code string ; for debugging * / < b >
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< / b > < / pre > < BR >
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< a name = "Chapter4" > < / a > < h2 > Frame compression types< / h2 > < pre > < / pre >
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< pre > < b > typedef enum {
LZ4F_default=0,
LZ4F_max64KB=4,
LZ4F_max256KB=5,
LZ4F_max1MB=6,
LZ4F_max4MB=7
LZ4F_OBSOLETE_ENUM(max64KB)
LZ4F_OBSOLETE_ENUM(max256KB)
LZ4F_OBSOLETE_ENUM(max1MB)
LZ4F_OBSOLETE_ENUM(max4MB)
} LZ4F_blockSizeID_t;
< / b > < / pre > < BR >
< pre > < b > typedef enum {
LZ4F_blockLinked=0,
LZ4F_blockIndependent
LZ4F_OBSOLETE_ENUM(blockLinked)
LZ4F_OBSOLETE_ENUM(blockIndependent)
} LZ4F_blockMode_t;
< / b > < / pre > < BR >
< pre > < b > typedef enum {
LZ4F_noContentChecksum=0,
LZ4F_contentChecksumEnabled
LZ4F_OBSOLETE_ENUM(noContentChecksum)
LZ4F_OBSOLETE_ENUM(contentChecksumEnabled)
} LZ4F_contentChecksum_t;
< / b > < / pre > < BR >
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< pre > < b > typedef enum {
LZ4F_noBlockChecksum=0,
LZ4F_blockChecksumEnabled
} LZ4F_blockChecksum_t;
< / b > < / pre > < BR >
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< pre > < b > typedef enum {
LZ4F_frame=0,
LZ4F_skippableFrame
LZ4F_OBSOLETE_ENUM(skippableFrame)
} LZ4F_frameType_t;
< / b > < / pre > < BR >
< pre > < b > typedef struct {
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LZ4F_blockSizeID_t blockSizeID; < / b > /* max64KB, max256KB, max1MB, max4MB; 0 == default */< b >
LZ4F_blockMode_t blockMode; < / b > /* LZ4F_blockLinked, LZ4F_blockIndependent; 0 == default */< b >
LZ4F_contentChecksum_t contentChecksumFlag; < / b > /* 1: frame terminated with 32-bit checksum of decompressed data; 0: disabled (default) */< b >
LZ4F_frameType_t frameType; < / b > /* read-only field : LZ4F_frame or LZ4F_skippableFrame */< b >
unsigned long long contentSize; < / b > /* Size of uncompressed content ; 0 == unknown */< b >
unsigned dictID; < / b > /* Dictionary ID, sent by compressor to help decoder select correct dictionary; 0 == no dictID provided */< b >
LZ4F_blockChecksum_t blockChecksumFlag; < / b > /* 1: each block followed by a checksum of block's compressed data; 0: disabled (default) */< b >
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} LZ4F_frameInfo_t;
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< / b > < p > makes it possible to set or read frame parameters.
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Structure must be first init to 0, using memset() or LZ4F_INIT_FRAMEINFO,
setting all parameters to default.
It's then possible to update selectively some parameters
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< / p > < / pre > < BR >
< pre > < b > typedef struct {
LZ4F_frameInfo_t frameInfo;
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int compressionLevel; < / b > /* 0: default (fast mode); values > LZ4HC_CLEVEL_MAX count as LZ4HC_CLEVEL_MAX; values < 0 trigger " fast acceleration " * / < b >
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unsigned autoFlush; < / b > /* 1: always flush; reduces usage of internal buffers */< b >
unsigned favorDecSpeed; < / b > /* 1: parser favors decompression speed vs compression ratio. Only works for high compression modes (>= LZ4HC_CLEVEL_OPT_MIN) */ /* v1.8.2+ */< b >
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unsigned reserved[3]; < / b > /* must be zero for forward compatibility */< b >
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} LZ4F_preferences_t;
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< / b > < p > makes it possible to supply advanced compression instructions to streaming interface.
Structure must be first init to 0, using memset() or LZ4F_INIT_PREFERENCES,
setting all parameters to default.
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All reserved fields must be set to zero.
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< / p > < / pre > < BR >
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< a name = "Chapter5" > < / a > < h2 > Simple compression function< / h2 > < pre > < / pre >
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< pre > < b > size_t LZ4F_compressFrameBound(size_t srcSize, const LZ4F_preferences_t* preferencesPtr);
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< / b > < p > Returns the maximum possible compressed size with LZ4F_compressFrame() given srcSize and preferences.
`preferencesPtr` is optional. It can be replaced by NULL, in which case, the function will assume default preferences.
Note : this result is only usable with LZ4F_compressFrame().
It may also be used with LZ4F_compressUpdate() _if no flush() operation_ is performed.
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< / p > < / pre > < BR >
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< pre > < b > size_t LZ4F_compressFrame(void* dstBuffer, size_t dstCapacity,
const void* srcBuffer, size_t srcSize,
const LZ4F_preferences_t* preferencesPtr);
< / b > < p > Compress an entire srcBuffer into a valid LZ4 frame.
dstCapacity MUST be >= LZ4F_compressFrameBound(srcSize, preferencesPtr).
The LZ4F_preferences_t structure is optional : you can provide NULL as argument. All preferences will be set to default.
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@return : number of bytes written into dstBuffer.
or an error code if it fails (can be tested using LZ4F_isError())
< / p > < / pre > < BR >
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< a name = "Chapter6" > < / a > < h2 > Advanced compression functions< / h2 > < pre > < / pre >
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< pre > < b > typedef struct {
unsigned stableSrc; < / b > /* 1 == src content will remain present on future calls to LZ4F_compress(); skip copying src content within tmp buffer */< b >
unsigned reserved[3];
} LZ4F_compressOptions_t;
< / b > < / pre > < BR >
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< a name = "Chapter7" > < / a > < h2 > Resource Management< / h2 > < pre > < / pre >
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< pre > < b > LZ4F_errorCode_t LZ4F_createCompressionContext(LZ4F_cctx** cctxPtr, unsigned version);
LZ4F_errorCode_t LZ4F_freeCompressionContext(LZ4F_cctx* cctx);
< / b > < p > The first thing to do is to create a compressionContext object, which will be used in all compression operations.
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This is achieved using LZ4F_createCompressionContext(), which takes as argument a version.
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The version provided MUST be LZ4F_VERSION. It is intended to track potential version mismatch, notably when using DLL.
The function will provide a pointer to a fully allocated LZ4F_cctx object.
If @return != zero, there was an error during context creation.
Object can release its memory using LZ4F_freeCompressionContext();
< / p > < / pre > < BR >
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< a name = "Chapter8" > < / a > < h2 > Compression< / h2 > < pre > < / pre >
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< pre > < b > size_t LZ4F_compressBegin(LZ4F_cctx* cctx,
void* dstBuffer, size_t dstCapacity,
const LZ4F_preferences_t* prefsPtr);
< / b > < p > will write the frame header into dstBuffer.
dstCapacity must be >= LZ4F_HEADER_SIZE_MAX bytes.
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`prefsPtr` is optional : you can provide NULL as argument, all preferences will then be set to default.
@return : number of bytes written into dstBuffer for the header
or an error code (which can be tested using LZ4F_isError())
< / p > < / pre > < BR >
< pre > < b > size_t LZ4F_compressBound(size_t srcSize, const LZ4F_preferences_t* prefsPtr);
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< / b > < p > Provides minimum dstCapacity required to guarantee success of
LZ4F_compressUpdate(), given a srcSize and preferences, for a worst case scenario.
When srcSize==0, LZ4F_compressBound() provides an upper bound for LZ4F_flush() and LZ4F_compressEnd() instead.
Note that the result is only valid for a single invocation of LZ4F_compressUpdate().
When invoking LZ4F_compressUpdate() multiple times,
if the output buffer is gradually filled up instead of emptied and re-used from its start,
one must check if there is enough remaining capacity before each invocation, using LZ4F_compressBound().
@return is always the same for a srcSize and prefsPtr.
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prefsPtr is optional : when NULL is provided, preferences will be set to cover worst case scenario.
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tech details :
@return includes the possibility that internal buffer might already be filled by up to (blockSize-1) bytes.
It also includes frame footer (ending + checksum), since it might be generated by LZ4F_compressEnd().
@return doesn't include frame header, as it was already generated by LZ4F_compressBegin().
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< / p > < / pre > < BR >
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< pre > < b > size_t LZ4F_compressUpdate(LZ4F_cctx* cctx,
void* dstBuffer, size_t dstCapacity,
const void* srcBuffer, size_t srcSize,
const LZ4F_compressOptions_t* cOptPtr);
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< / b > < p > LZ4F_compressUpdate() can be called repetitively to compress as much data as necessary.
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Important rule: dstCapacity MUST be large enough to ensure operation success even in worst case situations.
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This value is provided by LZ4F_compressBound().
If this condition is not respected, LZ4F_compress() will fail (result is an errorCode).
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LZ4F_compressUpdate() doesn't guarantee error recovery.
When an error occurs, compression context must be freed or resized.
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`cOptPtr` is optional : NULL can be provided, in which case all options are set to default.
@return : number of bytes written into `dstBuffer` (it can be zero, meaning input data was just buffered).
or an error code if it fails (which can be tested using LZ4F_isError())
< / p > < / pre > < BR >
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< pre > < b > size_t LZ4F_flush(LZ4F_cctx* cctx,
void* dstBuffer, size_t dstCapacity,
const LZ4F_compressOptions_t* cOptPtr);
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< / b > < p > When data must be generated and sent immediately, without waiting for a block to be completely filled,
it's possible to call LZ4_flush(). It will immediately compress any data buffered within cctx.
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`dstCapacity` must be large enough to ensure the operation will be successful.
`cOptPtr` is optional : it's possible to provide NULL, all options will be set to default.
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@return : nb of bytes written into dstBuffer (can be zero, when there is no data stored within cctx)
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or an error code if it fails (which can be tested using LZ4F_isError())
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Note : LZ4F_flush() is guaranteed to be successful when dstCapacity >= LZ4F_compressBound(0, prefsPtr).
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< / p > < / pre > < BR >
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< pre > < b > size_t LZ4F_compressEnd(LZ4F_cctx* cctx,
void* dstBuffer, size_t dstCapacity,
const LZ4F_compressOptions_t* cOptPtr);
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< / b > < p > To properly finish an LZ4 frame, invoke LZ4F_compressEnd().
It will flush whatever data remained within `cctx` (like LZ4_flush())
and properly finalize the frame, with an endMark and a checksum.
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`cOptPtr` is optional : NULL can be provided, in which case all options will be set to default.
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@return : nb of bytes written into dstBuffer, necessarily >= 4 (endMark),
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or an error code if it fails (which can be tested using LZ4F_isError())
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Note : LZ4F_compressEnd() is guaranteed to be successful when dstCapacity >= LZ4F_compressBound(0, prefsPtr).
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A successful call to LZ4F_compressEnd() makes `cctx` available again for another compression task.
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< / p > < / pre > < BR >
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< a name = "Chapter9" > < / a > < h2 > Decompression functions< / h2 > < pre > < / pre >
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< pre > < b > typedef struct {
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unsigned stableDst; < / b > /* pledges that last 64KB decompressed data will remain available unmodified. This optimization skips storage operations in tmp buffers. */< b >
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unsigned reserved[3]; < / b > /* must be set to zero for forward compatibility */< b >
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} LZ4F_decompressOptions_t;
< / b > < / pre > < BR >
< pre > < b > LZ4F_errorCode_t LZ4F_createDecompressionContext(LZ4F_dctx** dctxPtr, unsigned version);
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LZ4F_errorCode_t LZ4F_freeDecompressionContext(LZ4F_dctx* dctx);
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< / b > < p > Create an LZ4F_dctx object, to track all decompression operations.
The version provided MUST be LZ4F_VERSION.
The function provides a pointer to an allocated and initialized LZ4F_dctx object.
The result is an errorCode, which can be tested using LZ4F_isError().
dctx memory can be released using LZ4F_freeDecompressionContext();
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Result of LZ4F_freeDecompressionContext() indicates current state of decompressionContext when being released.
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That is, it should be == 0 if decompression has been completed fully and correctly.
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< / p > < / pre > < BR >
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< a name = "Chapter10" > < / a > < h2 > Streaming decompression functions< / h2 > < pre > < / pre >
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< pre > < b > size_t LZ4F_getFrameInfo(LZ4F_dctx* dctx,
LZ4F_frameInfo_t* frameInfoPtr,
const void* srcBuffer, size_t* srcSizePtr);
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< / b > < p > This function extracts frame parameters (max blockSize, dictID, etc.).
Its usage is optional.
Extracted information is typically useful for allocation and dictionary.
This function works in 2 situations :
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- At the beginning of a new frame, in which case
it will decode information from `srcBuffer`, starting the decoding process.
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Input size must be large enough to successfully decode the entire frame header.
Frame header size is variable, but is guaranteed to be < = LZ4F_HEADER_SIZE_MAX bytes.
It's allowed to provide more input data than this minimum.
- After decoding has been started.
In which case, no input is read, frame parameters are extracted from dctx.
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- If decoding has barely started, but not yet extracted information from header,
LZ4F_getFrameInfo() will fail.
The number of bytes consumed from srcBuffer will be updated within *srcSizePtr (necessarily < = original value).
Decompression must resume from (srcBuffer + *srcSizePtr).
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@return : an hint about how many srcSize bytes LZ4F_decompress() expects for next call,
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or an error code which can be tested using LZ4F_isError().
note 1 : in case of error, dctx is not modified. Decoding operation can resume from beginning safely.
note 2 : frame parameters are *copied into* an already allocated LZ4F_frameInfo_t structure.
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< / p > < / pre > < BR >
< pre > < b > size_t LZ4F_decompress(LZ4F_dctx* dctx,
void* dstBuffer, size_t* dstSizePtr,
const void* srcBuffer, size_t* srcSizePtr,
const LZ4F_decompressOptions_t* dOptPtr);
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< / b > < p > Call this function repetitively to regenerate compressed data from `srcBuffer`.
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The function will read up to *srcSizePtr bytes from srcBuffer,
and decompress data into dstBuffer, of capacity *dstSizePtr.
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The nb of bytes consumed from srcBuffer will be written into *srcSizePtr (necessarily < = original value).
The nb of bytes decompressed into dstBuffer will be written into *dstSizePtr (necessarily < = original value).
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The function does not necessarily read all input bytes, so always check value in *srcSizePtr.
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Unconsumed source data must be presented again in subsequent invocations.
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`dstBuffer` can freely change between each consecutive function invocation.
`dstBuffer` content will be overwritten.
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@return : an hint of how many `srcSize` bytes LZ4F_decompress() expects for next call.
Schematically, it's the size of the current (or remaining) compressed block + header of next block.
Respecting the hint provides some small speed benefit, because it skips intermediate buffers.
This is just a hint though, it's always possible to provide any srcSize.
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When a frame is fully decoded, @return will be 0 (no more data expected).
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When provided with more bytes than necessary to decode a frame,
LZ4F_decompress() will stop reading exactly at end of current frame, and @return 0.
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If decompression failed, @return is an error code, which can be tested using LZ4F_isError().
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After a decompression error, the `dctx` context is not resumable.
Use LZ4F_resetDecompressionContext() to return to clean state.
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After a frame is fully decoded, dctx can be used again to decompress another frame.
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< / p > < / pre > < BR >
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< pre > < b > void LZ4F_resetDecompressionContext(LZ4F_dctx* dctx); < / b > /* always successful */< b >
< / b > < p > In case of an error, the context is left in "undefined" state.
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In which case, it's necessary to reset it, before re-using it.
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This method can also be used to abruptly stop any unfinished decompression,
and start a new one using same context resources.
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< / p > < / pre > < BR >
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< pre > < b > typedef enum { LZ4F_LIST_ERRORS(LZ4F_GENERATE_ENUM)
_LZ4F_dummy_error_enum_for_c89_never_used } LZ4F_errorCodes;
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< / b > < / pre > < BR >
< a name = "Chapter11" > < / a > < h2 > Bulk processing dictionary API< / h2 > < pre > < / pre >
< pre > < b > LZ4FLIB_STATIC_API LZ4F_CDict* LZ4F_createCDict(const void* dictBuffer, size_t dictSize);
LZ4FLIB_STATIC_API void LZ4F_freeCDict(LZ4F_CDict* CDict);
< / b > < p > When compressing multiple messages / blocks with the same dictionary, it's recommended to load it just once.
LZ4_createCDict() will create a digested dictionary, ready to start future compression operations without startup delay.
LZ4_CDict can be created once and shared by multiple threads concurrently, since its usage is read-only.
`dictBuffer` can be released after LZ4_CDict creation, since its content is copied within CDict
< / p > < / pre > < BR >
< pre > < b > LZ4FLIB_STATIC_API size_t LZ4F_compressFrame_usingCDict(
LZ4F_cctx* cctx,
void* dst, size_t dstCapacity,
const void* src, size_t srcSize,
const LZ4F_CDict* cdict,
const LZ4F_preferences_t* preferencesPtr);
< / b > < p > Compress an entire srcBuffer into a valid LZ4 frame using a digested Dictionary.
cctx must point to a context created by LZ4F_createCompressionContext().
If cdict==NULL, compress without a dictionary.
dstBuffer MUST be >= LZ4F_compressFrameBound(srcSize, preferencesPtr).
If this condition is not respected, function will fail (@return an errorCode).
The LZ4F_preferences_t structure is optional : you may provide NULL as argument,
but it's not recommended, as it's the only way to provide dictID in the frame header.
@return : number of bytes written into dstBuffer.
or an error code if it fails (can be tested using LZ4F_isError())
< / p > < / pre > < BR >
< pre > < b > LZ4FLIB_STATIC_API size_t LZ4F_compressBegin_usingCDict(
LZ4F_cctx* cctx,
void* dstBuffer, size_t dstCapacity,
const LZ4F_CDict* cdict,
const LZ4F_preferences_t* prefsPtr);
< / b > < p > Inits streaming dictionary compression, and writes the frame header into dstBuffer.
dstCapacity must be >= LZ4F_HEADER_SIZE_MAX bytes.
`prefsPtr` is optional : you may provide NULL as argument,
however, it's the only way to provide dictID in the frame header.
@return : number of bytes written into dstBuffer for the header,
or an error code (which can be tested using LZ4F_isError())
< / p > < / pre > < BR >
< pre > < b > LZ4FLIB_STATIC_API size_t LZ4F_decompress_usingDict(
LZ4F_dctx* dctxPtr,
void* dstBuffer, size_t* dstSizePtr,
const void* srcBuffer, size_t* srcSizePtr,
const void* dict, size_t dictSize,
const LZ4F_decompressOptions_t* decompressOptionsPtr);
< / b > < p > Same as LZ4F_decompress(), using a predefined dictionary.
Dictionary is used "in place", without any preprocessing.
It must remain accessible throughout the entire frame decoding.
< / p > < / pre > < BR >
2017-01-23 15:31:42 +00:00
< / html >
< / body >
