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-
-============================================================================
-LZO -- a real-time data compression library LIBRARY REFERENCE
-============================================================================
-
-
-[ please read LZO.FAQ first ]
-
-
-Table of Contents
-=================
-
-1 Introduction to the LZO Library Reference
-1.1 Preliminary notes
-1.2 Headers
-2 General
-2.1 The memory model
-2.2 Public integral types
-2.3 Public pointer types
-2.4 Public function types
-3 Function reference
-3.1 Initialization
-3.2 Compression
-3.3 Decompression
-3.4 Optimization
-3.5 String functions
-3.6 Checksum functions
-3.7 Version functions
-4 Variable reference
-
-
-
-1 Introduction to the LZO Library Reference
-=============================================
-
-
-1.1 Preliminary notes
----------------------
-
-- 'C90' is short for ISO 9899-1990, the ANSI/ISO standard for the C
- programming language
-
-
-1.2 Headers
------------
-
-This section briefly describes the headers.
-
-<lzo/lzoconf.h>
-
- Contains definitions for the basic integral and pointer types,
- provides wrappers for the library calling conventions, defines
- error codes and contains prototypes for the generic functions.
- This file is automatically included by all LZO headers.
-
-<lzo/lzo1.h>
-<lzo/lzo1a.h>
-<lzo/lzo1b.h>
-<lzo/lzo1c.h>
-<lzo/lzo1f.h>
-<lzo/lzo1x.h>
-<lzo/lzo1y.h>
-<lzo/lzo1z.h>
-<lzo/lzo2a.h>
-
- These files provide definitions and prototypes for the
- actual (de-)compression functions.
-
-
-
-2 General
-=========
-
-
-2.1 The memory model
---------------------
-
-LZO requires a flat 32-bit or 64-bit memory model.
-
-
-2.2 Public integral types
--------------------------
-
-lzo_uint
-
- must match size_t
-
-lzo_bool
-
- can store the values 0 ("false") and 1 ("true")
-
-
-2.3 Public pointer types
-------------------------
-
-lzo_voidp
-
- pointer to void
-
-lzo_bytep
-
- pointer to unsigned char
-
-
-2.4 Public function types
--------------------------
-
-lzo_compress_t
-
-lzo_decompress_t
-
-lzo_optimize_t
-
-lzo_callback_t
-
-
-
-3 Function reference
-====================
-
-
-3.1 Initialization
-------------------
-
-int lzo_init ( void );
-
- This function initializes the LZO library. It must be the first LZO
- function you call, and you cannot use any of the other LZO library
- functions if the call fails.
-
- Return value:
- Returns LZO_E_OK on success, error code otherwise.
-
- Note:
- This function is actually implemented using a macro.
-
-
-3.2 Compression
----------------
-
-All compressors compress the memory block at 'src' with the uncompressed
-length 'src_len' to the address given by 'dst'.
-The length of the compressed blocked will be returned in the variable
-pointed by 'dst_len'.
-
-The two blocks may overlap under certain conditions (see examples/overlap.c),
-thereby allowing "in-place" compression.
-
-
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-#include <lzo/lzo1x.h>
-
-int lzo1x_1_compress ( const lzo_bytep src, lzo_uint src_len,
- lzo_bytep dst, lzo_uintp dst_len,
- lzo_voidp wrkmem );
-
- Algorithm: LZO1X
- Compression level: LZO1X-1
- Memory requirements: LZO1X_1_MEM_COMPRESS (64 KiB on 32-bit machines)
-
- This compressor is pretty fast.
-
- Return value:
- Always returns LZO_E_OK (this function can never fail).
-
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-#include <lzo/lzo1x.h>
-
-int lzo1x_999_compress ( const lzo_bytep src, lzo_uint src_len,
- lzo_bytep dst, lzo_uintp dst_len,
- lzo_voidp wrkmem );
-
- Algorithm: LZO1X
- Compression level: LZO1X-999
- Memory requirements: LZO1X_999_MEM_COMPRESS (448 KiB on 32-bit machines)
-
- This compressor is quite slow but achieves a good compression
- ratio. It is mainly intended for generating pre-compressed data.
-
- Return value:
- Always returns LZO_E_OK (this function can never fail).
-
-
-[ ... lots of other compressors which all follow the same principle ... ]
-
-
-
-3.3 Decompression
------------------
-
-All decompressors decompress the memory block at 'src' with the compressed
-length 'src_len' to the address given by 'dst'.
-The length of the decompressed block will be returned in the variable
-pointed by 'dst_len' - on error the number of bytes that have
-been decompressed so far will be returned.
-
-The safe decompressors expect that the number of bytes available in
-the 'dst' block is passed via the variable pointed by 'dst_len'.
-
-The two blocks may overlap under certain conditions (see examples/overlap.c),
-thereby allowing "in-place" decompression.
-
-
-Description of return values:
-
- LZO_E_OK
- Success.
-
- LZO_E_INPUT_NOT_CONSUMED
- The end of the compressed block has been detected before all
- bytes in the compressed block have been used.
- This may actually not be an error (if 'src_len' is too large).
-
- LZO_E_INPUT_OVERRUN
- The decompressor requested more bytes from the compressed
- block than available.
- Your data is corrupted (or 'src_len' is too small).
-
- LZO_E_OUTPUT_OVERRUN
- The decompressor requested to write more bytes to the uncompressed
- block than available.
- Either your data is corrupted, or you should increase the number of
- available bytes passed in the variable pointed by 'dst_len'.
-
- LZO_E_LOOKBEHIND_OVERRUN
- Your data is corrupted.
-
- LZO_E_EOF_NOT_FOUND
- No EOF code was found in the compressed block.
- Your data is corrupted (or 'src_len' is too small).
-
- LZO_E_ERROR
- Any other error (data corrupted).
-
-
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-#include <lzo1x.h>
-
-int lzo1x_decompress ( const lzo_bytep src, lzo_uint src_len,
- lzo_bytep dst, lzo_uintp dst_len,
- lzo_voidp wrkmem );
-
- Algorithm: LZO1X
- Memory requirements: 0
-
-
-[ ... lots of other decompressors which all follow the same principle ... ]
-
-
-
-4 Variable reference
-====================
-
-The variables are listed alphabetically.
-
-[ no public variables yet ]
-
-
-
---------------------------- END OF LZOAPI.TXT ------------------------------
-