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diff --git a/doc/lzlib.info b/doc/lzlib.info new file mode 100644 index 0000000..979c477 --- /dev/null +++ b/doc/lzlib.info @@ -0,0 +1,1336 @@ +This is lzlib.info, produced by makeinfo version 4.13+ from lzlib.texi. + +INFO-DIR-SECTION Compression +START-INFO-DIR-ENTRY +* Lzlib: (lzlib). Compression library for the lzip format +END-INFO-DIR-ENTRY + + +File: lzlib.info, Node: Top, Next: Introduction, Up: (dir) + +Lzlib Manual +************ + +This manual is for Lzlib (version 1.14, 20 January 2024). + +* Menu: + +* Introduction:: Purpose and features of lzlib +* Library version:: Checking library version +* Buffering:: Sizes of lzlib's buffers +* Parameter limits:: Min / max values for some parameters +* Compression functions:: Descriptions of the compression functions +* Decompression functions:: Descriptions of the decompression functions +* Error codes:: Meaning of codes returned by functions +* Error messages:: Error messages corresponding to error codes +* Invoking minilzip:: Command-line interface of the test program +* Data format:: Detailed format of the compressed data +* Examples:: A small tutorial with examples +* Problems:: Reporting bugs +* Concept index:: Index of concepts + + + Copyright (C) 2009-2024 Antonio Diaz Diaz. + + This manual is free documentation: you have unlimited permission to copy, +distribute, and modify it. + + +File: lzlib.info, Node: Introduction, Next: Library version, Prev: Top, Up: Top + +1 Introduction +************** + +Lzlib is a data compression library providing in-memory LZMA compression and +decompression functions, including integrity checking of the decompressed +data. The compressed data format used by the library is the lzip format. +Lzlib is written in C. + + The lzip file format is designed for data sharing and long-term +archiving, taking into account both data integrity and decoder availability: + + * The lzip format provides very safe integrity checking and some data + recovery means. The program lziprecover can repair bit flip errors + (one of the most common forms of data corruption) in lzip files, and + provides data recovery capabilities, including error-checked merging + of damaged copies of a file. *Note Data safety: (lziprecover)Data + safety. + + * The lzip format is as simple as possible (but not simpler). The lzip + manual provides the source code of a simple decompressor along with a + detailed explanation of how it works, so that with the only help of the + lzip manual it would be possible for a digital archaeologist to extract + the data from a lzip file long after quantum computers eventually + render LZMA obsolete. + + * Additionally the lzip reference implementation is copylefted, which + guarantees that it will remain free forever. + + A nice feature of the lzip format is that a corrupt byte is easier to +repair the nearer it is from the beginning of the file. Therefore, with the +help of lziprecover, losing an entire archive just because of a corrupt +byte near the beginning is a thing of the past. + + The functions and variables forming the interface of the compression +library are declared in the file 'lzlib.h'. Usage examples of the library +are given in the files 'bbexample.c', 'ffexample.c', and 'minilzip.c' from +the source distribution. + + As 'lzlib.h' can be used by C and C++ programs, it must not impose a +choice of system headers on the program by including one of them. Therefore +it is the responsibility of the program using lzlib to include before +'lzlib.h' some header that declares the type 'uint8_t'. There are at least +four such headers in C and C++: 'stdint.h', 'cstdint', 'inttypes.h', and +'cinttypes'. + + All the library functions are thread safe. The library does not install +any signal handler. The decoder checks the consistency of the compressed +data, so the library should never crash even in case of corrupted input. + + Compression/decompression is done by repeatedly calling a couple of +read/write functions until all the data have been processed by the library. +This interface is safer and less error prone than the traditional zlib +interface. + + Compression/decompression is done when the read function is called. This +means the value returned by the position functions is not updated until a +read call, even if a lot of data are written. If you want the data to be +compressed in advance, just call the read function with a SIZE equal to 0. + + If all the data to be compressed are written in advance, lzlib +automatically adjusts the header of the compressed data to use the largest +dictionary size that does not exceed neither the data size nor the limit +given to 'LZ_compress_open'. This feature reduces the amount of memory +needed for decompression and allows minilzip to produce identical +compressed output as lzip. + + Lzlib correctly decompresses a data stream which is the concatenation of +two or more compressed data streams. The result is the concatenation of the +corresponding decompressed data streams. Integrity testing of concatenated +compressed data streams is also supported. + + Lzlib is able to compress and decompress streams of unlimited size by +automatically creating multimember output. The members so created are large, +about 2 PiB each. + + In spite of its name (Lempel-Ziv-Markov chain-Algorithm), LZMA is not a +concrete algorithm; it is more like "any algorithm using the LZMA coding +scheme". For example, the option '-0' of lzip uses the scheme in almost the +simplest way possible; issuing the longest match it can find, or a literal +byte if it can't find a match. Inversely, a much more elaborated way of +finding coding sequences of minimum size than the one currently used by +lzip could be developed, and the resulting sequence could also be coded +using the LZMA coding scheme. + + Lzlib currently implements two variants of the LZMA algorithm: fast +(used by option '-0' of minilzip) and normal (used by all other compression +levels). + + The high compression of LZMA comes from combining two basic, well-proven +compression ideas: sliding dictionaries (LZ77) and markov models (the thing +used by every compression algorithm that uses a range encoder or similar +order-0 entropy coder as its last stage) with segregation of contexts +according to what the bits are used for. + + The ideas embodied in lzlib are due to (at least) the following people: +Abraham Lempel and Jacob Ziv (for the LZ algorithm), Andrei Markov (for the +definition of Markov chains), G.N.N. Martin (for the definition of range +encoding), Igor Pavlov (for putting all the above together in LZMA), and +Julian Seward (for bzip2's CLI). + + LANGUAGE NOTE: Uncompressed = not compressed = plain data; it may never +have been compressed. Decompressed is used to refer to data which have +undergone the process of decompression. + + +File: lzlib.info, Node: Library version, Next: Buffering, Prev: Introduction, Up: Top + +2 Library version +***************** + +One goal of lzlib is to keep perfect backward compatibility with older +versions of itself down to 1.0. Any application working with an older lzlib +should work with a newer lzlib. Installing a newer lzlib should not break +anything. This chapter describes the constants and functions that the +application can use to discover the version of the library being used. All +of them are declared in 'lzlib.h'. + + -- Constant: LZ_API_VERSION + This constant is defined in 'lzlib.h' and works as a version test + macro. The application should check at compile time that + LZ_API_VERSION is greater than or equal to the version required by the + application: + + #if !defined LZ_API_VERSION || LZ_API_VERSION < 1012 + #error "lzlib 1.12 or newer needed." + #endif + + Before version 1.8, lzlib didn't define LZ_API_VERSION. + LZ_API_VERSION was first defined in lzlib 1.8 to 1. + Since lzlib 1.12, LZ_API_VERSION is defined as (major * 1000 + minor). + + NOTE: Version test macros are the library's way of announcing +functionality to the application. They should not be confused with feature +test macros, which allow the application to announce to the library its +desire to have certain symbols and prototypes exposed. + + -- Function: int LZ_api_version ( void ) + If LZ_API_VERSION >= 1012, this function is declared in 'lzlib.h' (else + it doesn't exist). It returns the LZ_API_VERSION of the library object + code being used. The application should check at run time that the + value returned by 'LZ_api_version' is greater than or equal to the + version required by the application. An application may be dynamically + linked at run time with a different version of lzlib than the one it + was compiled for, and this should not break the application as long as + the library used provides the functionality required by the + application. + + #if defined LZ_API_VERSION && LZ_API_VERSION >= 1012 + if( LZ_api_version() < 1012 ) + show_error( "lzlib 1.12 or newer needed." ); + #endif + + -- Constant: const char * LZ_version_string + This string constant is defined in the header file 'lzlib.h' and + represents the version of the library being used at compile time. + + -- Function: const char * LZ_version ( void ) + This function returns a string representing the version of the library + being used at run time. + + +File: lzlib.info, Node: Buffering, Next: Parameter limits, Prev: Library version, Up: Top + +3 Buffering +*********** + +Lzlib internal functions need access to a memory chunk at least as large as +the dictionary size (sliding window). For efficiency reasons, the input +buffer for compression is twice or sixteen times as large as the dictionary +size. + + Finally, for safety reasons, lzlib uses two more internal buffers. + + These are the four buffers used by lzlib, and their guaranteed minimum +sizes: + + * Input compression buffer. Written to by the function + 'LZ_compress_write'. For the normal variant of LZMA, its size is two + times the dictionary size set with the function 'LZ_compress_open' or + 64 KiB, whichever is larger. For the fast variant, its size is 1 MiB. + + * Output compression buffer. Read from by the function + 'LZ_compress_read'. Its size is 64 KiB. + + * Input decompression buffer. Written to by the function + 'LZ_decompress_write'. Its size is 64 KiB. + + * Output decompression buffer. Read from by the function + 'LZ_decompress_read'. Its size is the dictionary size set in the header + of the member currently being decompressed or 64 KiB, whichever is + larger. + + +File: lzlib.info, Node: Parameter limits, Next: Compression functions, Prev: Buffering, Up: Top + +4 Parameter limits +****************** + +These functions provide minimum and maximum values for some parameters. +Current values are shown in square brackets. + + -- Function: int LZ_min_dictionary_bits ( void ) + Returns the base 2 logarithm of the smallest valid dictionary size + [12]. + + -- Function: int LZ_min_dictionary_size ( void ) + Returns the smallest valid dictionary size [4 KiB]. + + -- Function: int LZ_max_dictionary_bits ( void ) + Returns the base 2 logarithm of the largest valid dictionary size [29]. + + -- Function: int LZ_max_dictionary_size ( void ) + Returns the largest valid dictionary size [512 MiB]. + + -- Function: int LZ_min_match_len_limit ( void ) + Returns the smallest valid match length limit [5]. + + -- Function: int LZ_max_match_len_limit ( void ) + Returns the largest valid match length limit [273]. + + +File: lzlib.info, Node: Compression functions, Next: Decompression functions, Prev: Parameter limits, Up: Top + +5 Compression functions +*********************** + +These are the functions used to compress data. In case of error, all of +them return -1 or 0, for signed and unsigned return values respectively, +except 'LZ_compress_open' whose return value must be checked by calling +'LZ_compress_errno' before using it. + + -- Function: struct LZ_Encoder * LZ_compress_open ( const int + DICTIONARY_SIZE, const int MATCH_LEN_LIMIT, const unsigned long + long MEMBER_SIZE ) + Initializes the internal stream state for compression and returns a + pointer that can only be used as the ENCODER argument for the other + LZ_compress functions, or a null pointer if the encoder could not be + allocated. + + The returned pointer must be checked by calling 'LZ_compress_errno' + before using it. If 'LZ_compress_errno' does not return 'LZ_ok', the + returned pointer must not be used and should be freed with + 'LZ_compress_close' to avoid memory leaks. + + DICTIONARY_SIZE sets the dictionary size to be used, in bytes. Valid + values range from 4 KiB to 512 MiB. Note that dictionary sizes are + quantized. If the size specified does not match one of the valid + sizes, it is rounded upwards by adding up to (DICTIONARY_SIZE / 8) to + it. + + MATCH_LEN_LIMIT sets the match length limit in bytes. Valid values + range from 5 to 273. Larger values usually give better compression + ratios but longer compression times. + + If DICTIONARY_SIZE is 65535 and MATCH_LEN_LIMIT is 16, the fast + variant of LZMA is chosen, which produces identical compressed output + as 'lzip -0'. (The dictionary size used is rounded upwards to 64 KiB). + + MEMBER_SIZE sets the member size limit in bytes. Valid values range + from 4 KiB to 2 PiB. A small member size may degrade compression + ratio, so use it only when needed. To produce a single-member data + stream, give MEMBER_SIZE a value larger than the amount of data to be + produced. Values larger than 2 PiB are reduced to 2 PiB to prevent the + uncompressed size of the member from overflowing. + + -- Function: int LZ_compress_close ( struct LZ_Encoder * const ENCODER ) + Frees all dynamically allocated data structures for this stream. This + function discards any unprocessed input and does not flush any pending + output. After a call to 'LZ_compress_close', ENCODER can no longer be + used as an argument to any LZ_compress function. It is safe to call + 'LZ_compress_close' with a null argument. + + -- Function: int LZ_compress_finish ( struct LZ_Encoder * const ENCODER ) + Use this function to tell 'lzlib' that all the data for this member + have already been written (with the function 'LZ_compress_write'). It + is safe to call 'LZ_compress_finish' as many times as needed. After + all the compressed data have been read with 'LZ_compress_read' and + 'LZ_compress_member_finished' returns 1, a new member can be started + with 'LZ_compress_restart_member'. + + -- Function: int LZ_compress_restart_member ( struct LZ_Encoder * const + ENCODER, const unsigned long long MEMBER_SIZE ) + Use this function to start a new member in a multimember data stream. + Call this function only after 'LZ_compress_member_finished' indicates + that the current member has been fully read (with the function + 'LZ_compress_read'). *Note member_size::, for a description of + MEMBER_SIZE. + + -- Function: int LZ_compress_sync_flush ( struct LZ_Encoder * const + ENCODER ) + Use this function to make available to 'LZ_compress_read' all the data + already written with the function 'LZ_compress_write'. First call + 'LZ_compress_sync_flush'. Then call 'LZ_compress_read' until it + returns 0. + + This function writes at least one LZMA marker '3' ("Sync Flush" marker) + to the compressed output. Note that the sync flush marker is not + allowed in lzip files; it is a device for interactive communication + between applications using lzlib, but is useless and wasteful in a + file, and is excluded from the media type 'application/lzip'. The LZMA + marker '2' ("End Of Stream" marker) is the only marker allowed in lzip + files. *Note Data format::. + + Repeated use of 'LZ_compress_sync_flush' may degrade compression + ratio, so use it only when needed. If the interval between calls to + 'LZ_compress_sync_flush' is large (comparable to dictionary size), + creating a multimember data stream with 'LZ_compress_restart_member' + may be an alternative. + + Combining multimember stream creation with flushing may be tricky. If + there are more bytes available than those needed to complete + MEMBER_SIZE, 'LZ_compress_restart_member' needs to be called when + 'LZ_compress_member_finished' returns 1, followed by a new call to + 'LZ_compress_sync_flush'. + + -- Function: int LZ_compress_read ( struct LZ_Encoder * const ENCODER, + uint8_t * const BUFFER, const int SIZE ) + Reads up to SIZE bytes from the stream pointed to by ENCODER, storing + the results in BUFFER. If LZ_API_VERSION >= 1012, BUFFER may be a null + pointer, in which case the bytes read are discarded. + + Returns the number of bytes actually read. This might be less than + SIZE; for example, if there aren't that many bytes left in the stream + or if more bytes have to be yet written with the function + 'LZ_compress_write'. Note that reading less than SIZE bytes is not an + error. + + -- Function: int LZ_compress_write ( struct LZ_Encoder * const ENCODER, + uint8_t * const BUFFER, const int SIZE ) + Writes up to SIZE bytes from BUFFER to the stream pointed to by + ENCODER. Returns the number of bytes actually written. This might be + less than SIZE. Note that writing less than SIZE bytes is not an error. + + -- Function: int LZ_compress_write_size ( struct LZ_Encoder * const + ENCODER ) + Returns the maximum number of bytes that can be immediately written + through 'LZ_compress_write'. For efficiency reasons, once the input + buffer is full and 'LZ_compress_write_size' returns 0, almost all the + buffer must be compressed before a size greater than 0 is returned + again. (This is done to minimize the amount of data that must be + copied to the beginning of the buffer before new data can be accepted). + + It is guaranteed that an immediate call to 'LZ_compress_write' will + accept a SIZE up to the returned number of bytes. + + -- Function: enum LZ_Errno LZ_compress_errno ( struct LZ_Encoder * const + ENCODER ) + Returns the current error code for ENCODER. *Note Error codes::. It is + safe to call 'LZ_compress_errno' with a null argument, in which case + it returns 'LZ_bad_argument'. + + -- Function: int LZ_compress_finished ( struct LZ_Encoder * const ENCODER ) + Returns 1 if all the data have been read and 'LZ_compress_close' can + be safely called. Otherwise it returns 0. 'LZ_compress_finished' + implies 'LZ_compress_member_finished'. + + -- Function: int LZ_compress_member_finished ( struct LZ_Encoder * const + ENCODER ) + Returns 1 if the current member, in a multimember data stream, has been + fully read and 'LZ_compress_restart_member' can be safely called. + Otherwise it returns 0. + + -- Function: unsigned long long LZ_compress_data_position ( struct + LZ_Encoder * const ENCODER ) + Returns the number of input bytes already compressed in the current + member. + + -- Function: unsigned long long LZ_compress_member_position ( struct + LZ_Encoder * const ENCODER ) + Returns the number of compressed bytes already produced, but perhaps + not yet read, in the current member. + + -- Function: unsigned long long LZ_compress_total_in_size ( struct + LZ_Encoder * const ENCODER ) + Returns the total number of input bytes already compressed. + + -- Function: unsigned long long LZ_compress_total_out_size ( struct + LZ_Encoder * const ENCODER ) + Returns the total number of compressed bytes already produced, but + perhaps not yet read. + + +File: lzlib.info, Node: Decompression functions, Next: Error codes, Prev: Compression functions, Up: Top + +6 Decompression functions +************************* + +These are the functions used to decompress data. In case of error, all of +them return -1 or 0, for signed and unsigned return values respectively, +except 'LZ_decompress_open' whose return value must be checked by calling +'LZ_decompress_errno' before using it. + + -- Function: struct LZ_Decoder * LZ_decompress_open ( void ) + Initializes the internal stream state for decompression and returns a + pointer that can only be used as the DECODER argument for the other + LZ_decompress functions, or a null pointer if the decoder could not be + allocated. + + The returned pointer must be checked by calling 'LZ_decompress_errno' + before using it. If 'LZ_decompress_errno' does not return 'LZ_ok', the + returned pointer must not be used and should be freed with + 'LZ_decompress_close' to avoid memory leaks. + + -- Function: int LZ_decompress_close ( struct LZ_Decoder * const DECODER ) + Frees all dynamically allocated data structures for this stream. This + function discards any unprocessed input and does not flush any pending + output. After a call to 'LZ_decompress_close', DECODER can no longer + be used as an argument to any LZ_decompress function. It is safe to + call 'LZ_decompress_close' with a null argument. + + -- Function: int LZ_decompress_finish ( struct LZ_Decoder * const DECODER ) + Use this function to tell 'lzlib' that all the data for this stream + have already been written (with the function 'LZ_decompress_write'). + It is safe to call 'LZ_decompress_finish' as many times as needed. It + is not required to call 'LZ_decompress_finish' if the input stream + only contains whole members, but not calling it prevents lzlib from + detecting a truncated member. + + -- Function: int LZ_decompress_reset ( struct LZ_Decoder * const DECODER ) + Resets the internal state of DECODER as it was just after opening it + with the function 'LZ_decompress_open'. Data stored in the internal + buffers is discarded. Position counters are set to 0. + + -- Function: int LZ_decompress_sync_to_member ( struct LZ_Decoder * const + DECODER ) + Resets the error state of DECODER and enters a search state that lasts + until a new member header (or the end of the stream) is found. After a + successful call to 'LZ_decompress_sync_to_member', data written with + 'LZ_decompress_write' is consumed and 'LZ_decompress_read' returns 0 + until a header is found. + + This function is useful to discard any data preceding the first + member, or to discard the rest of the current member, for example in + case of a data error. If the decoder is already at the beginning of a + member, this function does nothing. + + -- Function: int LZ_decompress_read ( struct LZ_Decoder * const DECODER, + uint8_t * const BUFFER, const int SIZE ) + Reads up to SIZE bytes from the stream pointed to by DECODER, storing + the results in BUFFER. If LZ_API_VERSION >= 1012, BUFFER may be a null + pointer, in which case the bytes read are discarded. + + Returns the number of bytes actually read. This might be less than + SIZE; for example, if there aren't that many bytes left in the stream + or if more bytes have to be yet written with the function + 'LZ_decompress_write'. Note that reading less than SIZE bytes is not + an error. + + 'LZ_decompress_read' returns at least once per member so that + 'LZ_decompress_member_finished' can be called (and trailer data + retrieved) for each member, even for empty members. Therefore, + 'LZ_decompress_read' returning 0 does not mean that the end of the + stream has been reached. The increase in the value returned by + 'LZ_decompress_total_in_size' can be used to tell the end of the stream + from an empty member. + + In case of decompression error caused by corrupt or truncated data, + 'LZ_decompress_read' does not signal the error immediately to the + application, but waits until all the bytes decoded have been read. This + allows tools like tarlz to recover as much data as possible from each + damaged member. *Note tarlz manual: (tarlz)Top. + + -- Function: int LZ_decompress_write ( struct LZ_Decoder * const DECODER, + uint8_t * const BUFFER, const int SIZE ) + Writes up to SIZE bytes from BUFFER to the stream pointed to by + DECODER. Returns the number of bytes actually written. This might be + less than SIZE. Note that writing less than SIZE bytes is not an error. + + -- Function: int LZ_decompress_write_size ( struct LZ_Decoder * const + DECODER ) + Returns the maximum number of bytes that can be immediately written + through 'LZ_decompress_write'. This number varies smoothly; each + compressed byte consumed may be overwritten immediately, increasing by + 1 the value returned. + + It is guaranteed that an immediate call to 'LZ_decompress_write' will + accept a SIZE up to the returned number of bytes. + + -- Function: enum LZ_Errno LZ_decompress_errno ( struct LZ_Decoder * const + DECODER ) + Returns the current error code for DECODER. *Note Error codes::. It is + safe to call 'LZ_decompress_errno' with a null argument, in which case + it returns 'LZ_bad_argument'. + + -- Function: int LZ_decompress_finished ( struct LZ_Decoder * const + DECODER ) + Returns 1 if all the data have been read and 'LZ_decompress_close' can + be safely called. Otherwise it returns 0. 'LZ_decompress_finished' + does not imply 'LZ_decompress_member_finished'. + + -- Function: int LZ_decompress_member_finished ( struct LZ_Decoder * const + DECODER ) + Returns 1 if the previous call to 'LZ_decompress_read' finished reading + the current member, indicating that final values for the member are + available through 'LZ_decompress_data_crc', + 'LZ_decompress_data_position', and 'LZ_decompress_member_position'. + Otherwise it returns 0. + + -- Function: int LZ_decompress_member_version ( struct LZ_Decoder * const + DECODER ) + Returns the version of the current member, read from the member header. + + -- Function: int LZ_decompress_dictionary_size ( struct LZ_Decoder * const + DECODER ) + Returns the dictionary size of the current member, read from the + member header. + + -- Function: unsigned LZ_decompress_data_crc ( struct LZ_Decoder * const + DECODER ) + Returns the 32 bit Cyclic Redundancy Check of the data decompressed + from the current member. The value returned is valid only when + 'LZ_decompress_member_finished' returns 1. + + -- Function: unsigned long long LZ_decompress_data_position ( struct + LZ_Decoder * const DECODER ) + Returns the number of decompressed bytes already produced, but perhaps + not yet read, in the current member. + + -- Function: unsigned long long LZ_decompress_member_position ( struct + LZ_Decoder * const DECODER ) + Returns the number of input bytes already decompressed in the current + member. + + -- Function: unsigned long long LZ_decompress_total_in_size ( struct + LZ_Decoder * const DECODER ) + Returns the total number of input bytes already decompressed. + + -- Function: unsigned long long LZ_decompress_total_out_size ( struct + LZ_Decoder * const DECODER ) + Returns the total number of decompressed bytes already produced, but + perhaps not yet read. + + +File: lzlib.info, Node: Error codes, Next: Error messages, Prev: Decompression functions, Up: Top + +7 Error codes +************* + +Most library functions return -1 to indicate that they have failed. But +this return value only tells you that an error has occurred. To find out +what kind of error it was, you need to check the error code by calling +'LZ_(de)compress_errno'. + + Library functions don't change the value returned by +'LZ_(de)compress_errno' when they succeed; thus, the value returned by +'LZ_(de)compress_errno' after a successful call is not necessarily LZ_ok, +and you should not use 'LZ_(de)compress_errno' to determine whether a call +failed. If the call failed, then you can examine 'LZ_(de)compress_errno'. + + The error codes are defined in the header file 'lzlib.h'. + + -- Constant: enum LZ_Errno LZ_ok + The value of this constant is 0 and is used to indicate that there is + no error. + + -- Constant: enum LZ_Errno LZ_bad_argument + At least one of the arguments passed to the library function was + invalid. + + -- Constant: enum LZ_Errno LZ_mem_error + No memory available. The system cannot allocate more virtual memory + because its capacity is full. + + -- Constant: enum LZ_Errno LZ_sequence_error + A library function was called in the wrong order. For example + 'LZ_compress_restart_member' was called before + 'LZ_compress_member_finished' indicates that the current member is + finished. + + -- Constant: enum LZ_Errno LZ_header_error + An invalid member header (one with the wrong magic bytes) was read. If + this happens at the end of the data stream it may indicate trailing + data. + + -- Constant: enum LZ_Errno LZ_unexpected_eof + The end of the data stream was reached in the middle of a member. + + -- Constant: enum LZ_Errno LZ_data_error + The data stream is corrupt. If 'LZ_decompress_member_position' is 6 or + less, it indicates either a format version not supported, an invalid + dictionary size, a corrupt header in a multimember data stream, or + trailing data too similar to a valid lzip header. Lziprecover can be + used to remove conflicting trailing data from a file. + + -- Constant: enum LZ_Errno LZ_library_error + A bug was detected in the library. Please, report it. *Note Problems::. + + +File: lzlib.info, Node: Error messages, Next: Invoking minilzip, Prev: Error codes, Up: Top + +8 Error messages +**************** + + -- Function: const char * LZ_strerror ( const enum LZ_Errno LZ_ERRNO ) + Returns the standard error message for a given error code. The messages + are fairly short; there are no multi-line messages or embedded + newlines. This function makes it easy for your program to report + informative error messages about the failure of a library call. + + The value of LZ_ERRNO normally comes from a call to + 'LZ_(de)compress_errno'. + + +File: lzlib.info, Node: Invoking minilzip, Next: Data format, Prev: Error messages, Up: Top + +9 Invoking minilzip +******************* + +Minilzip is a test program for the compression library lzlib, compatible +with lzip 1.4 or newer. + + Lzip is a lossless data compressor with a user interface similar to the +one of gzip or bzip2. Lzip uses a simplified form of the 'Lempel-Ziv-Markov +chain-Algorithm' (LZMA) stream format to maximize interoperability. The +maximum dictionary size is 512 MiB so that any lzip file can be decompressed +on 32-bit machines. Lzip provides accurate and robust 3-factor integrity +checking. Lzip can compress about as fast as gzip (lzip -0) or compress most +files more than bzip2 (lzip -9). Decompression speed is intermediate between +gzip and bzip2. Lzip is better than gzip and bzip2 from a data recovery +perspective. Lzip has been designed, written, and tested with great care to +replace gzip and bzip2 as the standard general-purpose compressed format for +Unix-like systems. + +The format for running minilzip is: + + minilzip [OPTIONS] [FILES] + +If no file names are specified, minilzip compresses (or decompresses) from +standard input to standard output. A hyphen '-' used as a FILE argument +means standard input. It can be mixed with other FILES and is read just +once, the first time it appears in the command line. Remember to prepend +'./' to any file name beginning with a hyphen, or use '--'. + + minilzip supports the following options: *Note Argument syntax: +(arg_parser)Argument syntax. + +'-h' +'--help' + Print an informative help message describing the options and exit. + +'-V' +'--version' + Print the version number of minilzip on the standard output and exit. + This version number should be included in all bug reports. + +'-a' +'--trailing-error' + Exit with error status 2 if any remaining input is detected after + decompressing the last member. Such remaining input is usually trailing + garbage that can be safely ignored. + +'-b BYTES' +'--member-size=BYTES' + When compressing, set the member size limit to BYTES. It is advisable + to keep members smaller than RAM size so that they can be repaired with + lziprecover in case of corruption. A small member size may degrade + compression ratio, so use it only when needed. Valid values range from + 100 kB to 2 PiB. Defaults to 2 PiB. + +'-c' +'--stdout' + Compress or decompress to standard output; keep input files unchanged. + If compressing several files, each file is compressed independently. + (The output consists of a sequence of independently compressed + members). This option (or '-o') is needed when reading from a named + pipe (fifo) or from a device. Use it also to recover as much of the + decompressed data as possible when decompressing a corrupt file. '-c' + overrides '-o' and '-S'. '-c' has no effect when testing. + +'-d' +'--decompress' + Decompress the files specified. The integrity of the files specified is + checked. If a file does not exist, can't be opened, or the destination + file already exists and '--force' has not been specified, minilzip + continues decompressing the rest of the files and exits with error + status 1. If a file fails to decompress, or is a terminal, minilzip + exits immediately with error status 2 without decompressing the rest + of the files. A terminal is considered an uncompressed file, and + therefore invalid. + +'-f' +'--force' + Force overwrite of output files. + +'-F' +'--recompress' + When compressing, force re-compression of files whose name already has + the '.lz' or '.tlz' suffix. + +'-k' +'--keep' + Keep (don't delete) input files during compression or decompression. + +'-m BYTES' +'--match-length=BYTES' + When compressing, set the match length limit in bytes. After a match + this long is found, the search is finished. Valid values range from 5 + to 273. Larger values usually give better compression ratios but + longer compression times. + +'-o FILE' +'--output=FILE' + If '-c' has not been also specified, write the (de)compressed output + to FILE; keep input files unchanged. If compressing several files, + each file is compressed independently. (The output consists of a + sequence of independently compressed members). This option (or '-c') + is needed when reading from a named pipe (fifo) or from a device. + '-o -' is equivalent to '-c'. '-o' has no effect when testing. + + When compressing and splitting the output in volumes, FILE is used as + a prefix, and several files named 'FILE00001.lz', 'FILE00002.lz', etc, + are created. In this case, only one input file is allowed. + +'-q' +'--quiet' + Quiet operation. Suppress all messages. + +'-s BYTES' +'--dictionary-size=BYTES' + When compressing, set the dictionary size limit in bytes. Minilzip + uses for each file the largest dictionary size that does not exceed + neither the file size nor this limit. Valid values range from 4 KiB to + 512 MiB. Values 12 to 29 are interpreted as powers of two, meaning + 2^12 to 2^29 bytes. Dictionary sizes are quantized so that they can be + coded in just one byte (*note coded-dict-size::). If the size + specified does not match one of the valid sizes, it is rounded upwards + by adding up to (BYTES / 8) to it. + + For maximum compression you should use a dictionary size limit as large + as possible, but keep in mind that the decompression memory requirement + is affected at compression time by the choice of dictionary size limit. + +'-S BYTES' +'--volume-size=BYTES' + When compressing, and '-c' has not been also specified, split the + compressed output into several volume files with names + 'original_name00001.lz', 'original_name00002.lz', etc, and set the + volume size limit to BYTES. Input files are kept unchanged. Each + volume is a complete, maybe multimember, lzip file. A small volume + size may degrade compression ratio, so use it only when needed. Valid + values range from 100 kB to 4 EiB. + +'-t' +'--test' + Check integrity of the files specified, but don't decompress them. This + really performs a trial decompression and throws away the result. Use + it together with '-v' to see information about the files. If a file + fails the test, does not exist, can't be opened, or is a terminal, + minilzip continues testing the rest of the files. A final diagnostic + is shown at verbosity level 1 or higher if any file fails the test + when testing multiple files. + +'-v' +'--verbose' + Verbose mode. + When compressing, show the compression ratio and size for each file + processed. + When decompressing or testing, further -v's (up to 4) increase the + verbosity level, showing status, compression ratio, dictionary size, + and trailer contents (CRC, data size, member size). + +'-0 .. -9' + Compression level. Set the compression parameters (dictionary size and + match length limit) as shown in the table below. The default + compression level is '-6', equivalent to '-s8MiB -m36'. Note that '-9' + can be much slower than '-0'. These options have no effect when + decompressing or testing. + + The bidimensional parameter space of LZMA can't be mapped to a linear + scale optimal for all files. If your files are large, very repetitive, + etc, you may need to use the options '--dictionary-size' and + '--match-length' directly to achieve optimal performance. + + If several compression levels or '-s' or '-m' options are given, the + last setting is used. For example '-9 -s64MiB' is equivalent to + '-s64MiB -m273' + + Level Dictionary size (-s) Match length limit (-m) + -0 64 KiB 16 bytes + -1 1 MiB 5 bytes + -2 1.5 MiB 6 bytes + -3 2 MiB 8 bytes + -4 3 MiB 12 bytes + -5 4 MiB 20 bytes + -6 8 MiB 36 bytes + -7 16 MiB 68 bytes + -8 24 MiB 132 bytes + -9 32 MiB 273 bytes + +'--fast' +'--best' + Aliases for GNU gzip compatibility. + +'--loose-trailing' + When decompressing or testing, allow trailing data whose first bytes + are so similar to the magic bytes of a lzip header that they can be + confused with a corrupt header. Use this option if a file triggers a + "corrupt header" error and the cause is not indeed a corrupt header. + +'--check-lib' + Compare the version of lzlib used to compile minilzip with the version + actually being used at run time and exit. Report any differences + found. Exit with error status 1 if differences are found. A mismatch + may indicate that lzlib is not correctly installed or that a different + version of lzlib has been installed after compiling the shared version + of minilzip. Exit with error status 2 if LZ_API_VERSION and + LZ_version_string don't match. 'minilzip -v --check-lib' shows the + version of lzlib being used and the value of LZ_API_VERSION (if + defined). *Note Library version::. + + + Numbers given as arguments to options may be expressed in decimal, +hexadecimal, or octal (using the same syntax as integer constants in C++), +and may be followed by a multiplier and an optional 'B' for "byte". + + Table of SI and binary prefixes (unit multipliers): + +Prefix Value | Prefix Value +k kilobyte (10^3 = 1000) | Ki kibibyte (2^10 = 1024) +M megabyte (10^6) | Mi mebibyte (2^20) +G gigabyte (10^9) | Gi gibibyte (2^30) +T terabyte (10^12) | Ti tebibyte (2^40) +P petabyte (10^15) | Pi pebibyte (2^50) +E exabyte (10^18) | Ei exbibyte (2^60) +Z zettabyte (10^21) | Zi zebibyte (2^70) +Y yottabyte (10^24) | Yi yobibyte (2^80) +R ronnabyte (10^27) | Ri robibyte (2^90) +Q quettabyte (10^30) | Qi quebibyte (2^100) + + + Exit status: 0 for a normal exit, 1 for environmental problems (file not +found, invalid command-line options, I/O errors, etc), 2 to indicate a +corrupt or invalid input file, 3 for an internal consistency error (e.g., +bug) which caused minilzip to panic. + + +File: lzlib.info, Node: Data format, Next: Examples, Prev: Invoking minilzip, Up: Top + +10 Data format +************** + +Perfection is reached, not when there is no longer anything to add, but +when there is no longer anything to take away. +-- Antoine de Saint-Exupery + + + In the diagram below, a box like this: + ++---+ +| | <-- the vertical bars might be missing ++---+ + + represents one byte; a box like this: + ++==============+ +| | ++==============+ + + represents a variable number of bytes. + + + Lzip data consist of one or more independent "members" (compressed data +sets). The members simply appear one after another in the data stream, with +no additional information before, between, or after them. Each member can +encode in compressed form up to 16 EiB - 1 byte of uncompressed data. The +size of a multimember data stream is unlimited. + + Each member has the following structure: + ++--+--+--+--+----+----+=============+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +| ID string | VN | DS | LZMA stream | CRC32 | Data size | Member size | ++--+--+--+--+----+----+=============+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + All multibyte values are stored in little endian order. + +'ID string (the "magic" bytes)' + A four byte string, identifying the lzip format, with the value "LZIP" + (0x4C, 0x5A, 0x49, 0x50). + +'VN (version number, 1 byte)' + Just in case something needs to be modified in the future. 1 for now. + +'DS (coded dictionary size, 1 byte)' + The dictionary size is calculated by taking a power of 2 (the base + size) and subtracting from it a fraction between 0/16 and 7/16 of the + base size. + Bits 4-0 contain the base 2 logarithm of the base size (12 to 29). + Bits 7-5 contain the numerator of the fraction (0 to 7) to subtract + from the base size to obtain the dictionary size. + Example: 0xD3 = 2^19 - 6 * 2^15 = 512 KiB - 6 * 32 KiB = 320 KiB + Valid values for dictionary size range from 4 KiB to 512 MiB. + +'LZMA stream' + The LZMA stream, finished by an "End Of Stream" marker. Uses default + values for encoder properties. *Note Stream format: (lzip)Stream + format, for a complete description. + Lzip only uses the LZMA marker '2' ("End Of Stream" marker). Lzlib + also uses the LZMA marker '3' ("Sync Flush" marker). *Note + sync_flush::. + +'CRC32 (4 bytes)' + Cyclic Redundancy Check (CRC) of the original uncompressed data. + +'Data size (8 bytes)' + Size of the original uncompressed data. + +'Member size (8 bytes)' + Total size of the member, including header and trailer. This field acts + as a distributed index, improves the checking of stream integrity, and + facilitates the safe recovery of undamaged members from multimember + files. Lzip limits the member size to 2 PiB to prevent the data size + field from overflowing. + + + +File: lzlib.info, Node: Examples, Next: Problems, Prev: Data format, Up: Top + +11 A small tutorial with examples +********************************* + +This chapter provides real code examples for the most common uses of the +library. See these examples in context in the files 'bbexample.c' and +'ffexample.c' from the source distribution of lzlib. + + Note that the interface of lzlib is symmetrical. That is, the code for +normal compression and decompression is identical except because one calls +LZ_compress* functions while the other calls LZ_decompress* functions. + +* Menu: + +* Buffer compression:: Buffer-to-buffer single-member compression +* Buffer decompression:: Buffer-to-buffer decompression +* File compression:: File-to-file single-member compression +* File decompression:: File-to-file decompression +* File compression mm:: File-to-file multimember compression +* Skipping data errors:: Decompression with automatic resynchronization + + +File: lzlib.info, Node: Buffer compression, Next: Buffer decompression, Up: Examples + +11.1 Buffer compression +======================= + +Buffer-to-buffer single-member compression (MEMBER_SIZE > total output). + +/* Compress 'insize' bytes from 'inbuf' to 'outbuf'. + Return the size of the compressed data in '*outlenp'. + In case of error, or if 'outsize' is too small, return false and do not + modify '*outlenp'. +*/ +bool bbcompress( const uint8_t * const inbuf, const int insize, + const int dictionary_size, const int match_len_limit, + uint8_t * const outbuf, const int outsize, + int * const outlenp ) + { + int inpos = 0, outpos = 0; + bool error = false; + struct LZ_Encoder * const encoder = + LZ_compress_open( dictionary_size, match_len_limit, INT64_MAX ); + if( !encoder || LZ_compress_errno( encoder ) != LZ_ok ) + { LZ_compress_close( encoder ); return false; } + + while( true ) + { + int ret = LZ_compress_write( encoder, inbuf + inpos, insize - inpos ); + if( ret < 0 ) { error = true; break; } + inpos += ret; + if( inpos >= insize ) LZ_compress_finish( encoder ); + ret = LZ_compress_read( encoder, outbuf + outpos, outsize - outpos ); + if( ret < 0 ) { error = true; break; } + outpos += ret; + if( LZ_compress_finished( encoder ) == 1 ) break; + if( outpos >= outsize ) { error = true; break; } + } + + if( LZ_compress_close( encoder ) < 0 ) error = true; + if( error ) return false; + *outlenp = outpos; + return true; + } + + +File: lzlib.info, Node: Buffer decompression, Next: File compression, Prev: Buffer compression, Up: Examples + +11.2 Buffer decompression +========================= + +Buffer-to-buffer decompression. + +/* Decompress 'insize' bytes from 'inbuf' to 'outbuf'. + Return the size of the decompressed data in '*outlenp'. + In case of error, or if 'outsize' is too small, return false and do not + modify '*outlenp'. +*/ +bool bbdecompress( const uint8_t * const inbuf, const int insize, + uint8_t * const outbuf, const int outsize, + int * const outlenp ) + { + int inpos = 0, outpos = 0; + bool error = false; + struct LZ_Decoder * const decoder = LZ_decompress_open(); + if( !decoder || LZ_decompress_errno( decoder ) != LZ_ok ) + { LZ_decompress_close( decoder ); return false; } + + while( true ) + { + int ret = LZ_decompress_write( decoder, inbuf + inpos, insize - inpos ); + if( ret < 0 ) { error = true; break; } + inpos += ret; + if( inpos >= insize ) LZ_decompress_finish( decoder ); + ret = LZ_decompress_read( decoder, outbuf + outpos, outsize - outpos ); + if( ret < 0 ) { error = true; break; } + outpos += ret; + if( LZ_decompress_finished( decoder ) == 1 ) break; + if( outpos >= outsize ) { error = true; break; } + } + + if( LZ_decompress_close( decoder ) < 0 ) error = true; + if( error ) return false; + *outlenp = outpos; + return true; + } + + +File: lzlib.info, Node: File compression, Next: File decompression, Prev: Buffer decompression, Up: Examples + +11.3 File compression +===================== + +File-to-file compression using LZ_compress_write_size. + +int ffcompress( struct LZ_Encoder * const encoder, + FILE * const infile, FILE * const outfile ) + { + enum { buffer_size = 16384 }; + uint8_t buffer[buffer_size]; + while( true ) + { + int len, ret; + int size = min( buffer_size, LZ_compress_write_size( encoder ) ); + if( size > 0 ) + { + len = fread( buffer, 1, size, infile ); + ret = LZ_compress_write( encoder, buffer, len ); + if( ret < 0 || ferror( infile ) ) break; + if( feof( infile ) ) LZ_compress_finish( encoder ); + } + ret = LZ_compress_read( encoder, buffer, buffer_size ); + if( ret < 0 ) break; + len = fwrite( buffer, 1, ret, outfile ); + if( len < ret ) break; + if( LZ_compress_finished( encoder ) == 1 ) return 0; + } + return 1; + } + + +File: lzlib.info, Node: File decompression, Next: File compression mm, Prev: File compression, Up: Examples + +11.4 File decompression +======================= + +File-to-file decompression using LZ_decompress_write_size. + +int ffdecompress( struct LZ_Decoder * const decoder, + FILE * const infile, FILE * const outfile ) + { + enum { buffer_size = 16384 }; + uint8_t buffer[buffer_size]; + while( true ) + { + int len, ret; + int size = min( buffer_size, LZ_decompress_write_size( decoder ) ); + if( size > 0 ) + { + len = fread( buffer, 1, size, infile ); + ret = LZ_decompress_write( decoder, buffer, len ); + if( ret < 0 || ferror( infile ) ) break; + if( feof( infile ) ) LZ_decompress_finish( decoder ); + } + ret = LZ_decompress_read( decoder, buffer, buffer_size ); + if( ret < 0 ) break; + len = fwrite( buffer, 1, ret, outfile ); + if( len < ret ) break; + if( LZ_decompress_finished( decoder ) == 1 ) return 0; + } + return 1; + } + + +File: lzlib.info, Node: File compression mm, Next: Skipping data errors, Prev: File decompression, Up: Examples + +11.5 File-to-file multimember compression +========================================= + +Example 1: Multimember compression with members of fixed size +(MEMBER_SIZE < total output). + +int ffmmcompress( FILE * const infile, FILE * const outfile ) + { + enum { buffer_size = 16384, member_size = 4096 }; + uint8_t buffer[buffer_size]; + bool done = false; + struct LZ_Encoder * const encoder = + LZ_compress_open( 65535, 16, member_size ); + if( !encoder || LZ_compress_errno( encoder ) != LZ_ok ) + { fputs( "ffexample: Not enough memory.\n", stderr ); + LZ_compress_close( encoder ); return 1; } + while( true ) + { + int len, ret; + int size = min( buffer_size, LZ_compress_write_size( encoder ) ); + if( size > 0 ) + { + len = fread( buffer, 1, size, infile ); + ret = LZ_compress_write( encoder, buffer, len ); + if( ret < 0 || ferror( infile ) ) break; + if( feof( infile ) ) LZ_compress_finish( encoder ); + } + ret = LZ_compress_read( encoder, buffer, buffer_size ); + if( ret < 0 ) break; + len = fwrite( buffer, 1, ret, outfile ); + if( len < ret ) break; + if( LZ_compress_member_finished( encoder ) == 1 ) + { + if( LZ_compress_finished( encoder ) == 1 ) { done = true; break; } + if( LZ_compress_restart_member( encoder, member_size ) < 0 ) break; + } + } + if( LZ_compress_close( encoder ) < 0 ) done = false; + return done; + } + + +Example 2: Multimember compression (user-restarted members). (Call +LZ_compress_open with MEMBER_SIZE > largest member). + +/* Compress 'infile' to 'outfile' as a multimember stream with one member + for each line of text terminated by a newline character or by EOF. + Return 0 if success, 1 if error. +*/ +int fflfcompress( struct LZ_Encoder * const encoder, + FILE * const infile, FILE * const outfile ) + { + enum { buffer_size = 16384 }; + uint8_t buffer[buffer_size]; + while( true ) + { + int len, ret; + int size = min( buffer_size, LZ_compress_write_size( encoder ) ); + if( size > 0 ) + { + for( len = 0; len < size; ) + { + int ch = getc( infile ); + if( ch == EOF || ( buffer[len++] = ch ) == '\n' ) break; + } + /* avoid writing an empty member to outfile */ + if( len == 0 && LZ_compress_data_position( encoder ) == 0 ) return 0; + ret = LZ_compress_write( encoder, buffer, len ); + if( ret < 0 || ferror( infile ) ) break; + if( feof( infile ) || buffer[len-1] == '\n' ) + LZ_compress_finish( encoder ); + } + ret = LZ_compress_read( encoder, buffer, buffer_size ); + if( ret < 0 ) break; + len = fwrite( buffer, 1, ret, outfile ); + if( len < ret ) break; + if( LZ_compress_member_finished( encoder ) == 1 ) + { + if( feof( infile ) && LZ_compress_finished( encoder ) == 1 ) return 0; + if( LZ_compress_restart_member( encoder, INT64_MAX ) < 0 ) break; + } + } + return 1; + } + + +File: lzlib.info, Node: Skipping data errors, Prev: File compression mm, Up: Examples + +11.6 Skipping data errors +========================= + +/* Decompress 'infile' to 'outfile' with automatic resynchronization to + next member in case of data error, including the automatic removal of + leading garbage. +*/ +int ffrsdecompress( struct LZ_Decoder * const decoder, + FILE * const infile, FILE * const outfile ) + { + enum { buffer_size = 16384 }; + uint8_t buffer[buffer_size]; + while( true ) + { + int len, ret; + int size = min( buffer_size, LZ_decompress_write_size( decoder ) ); + if( size > 0 ) + { + len = fread( buffer, 1, size, infile ); + ret = LZ_decompress_write( decoder, buffer, len ); + if( ret < 0 || ferror( infile ) ) break; + if( feof( infile ) ) LZ_decompress_finish( decoder ); + } + ret = LZ_decompress_read( decoder, buffer, buffer_size ); + if( ret < 0 ) + { + if( LZ_decompress_errno( decoder ) == LZ_header_error || + LZ_decompress_errno( decoder ) == LZ_data_error ) + { LZ_decompress_sync_to_member( decoder ); continue; } + break; + } + len = fwrite( buffer, 1, ret, outfile ); + if( len < ret ) break; + if( LZ_decompress_finished( decoder ) == 1 ) return 0; + } + return 1; + } + + +File: lzlib.info, Node: Problems, Next: Concept index, Prev: Examples, Up: Top + +12 Reporting bugs +***************** + +There are probably bugs in lzlib. There are certainly errors and omissions +in this manual. If you report them, they will get fixed. If you don't, no +one will ever know about them and they will remain unfixed for all +eternity, if not longer. + + If you find a bug in lzlib, please send electronic mail to +<lzip-bug@nongnu.org>. Include the version number, which you can find by +running 'minilzip --version' and 'minilzip -v --check-lib'. + + +File: lzlib.info, Node: Concept index, Prev: Problems, Up: Top + +Concept index +************* + + +* Menu: + +* buffer compression: Buffer compression. (line 6) +* buffer decompression: Buffer decompression. (line 6) +* buffering: Buffering. (line 6) +* bugs: Problems. (line 6) +* compression functions: Compression functions. (line 6) +* data format: Data format. (line 6) +* decompression functions: Decompression functions. (line 6) +* error codes: Error codes. (line 6) +* error messages: Error messages. (line 6) +* examples: Examples. (line 6) +* file compression: File compression. (line 6) +* file decompression: File decompression. (line 6) +* getting help: Problems. (line 6) +* introduction: Introduction. (line 6) +* invoking: Invoking minilzip. (line 6) +* library version: Library version. (line 6) +* multimember compression: File compression mm. (line 6) +* options: Invoking minilzip. (line 6) +* parameter limits: Parameter limits. (line 6) +* skipping data errors: Skipping data errors. (line 6) + + + +Tag Table: +Node: Top215 +Node: Introduction1338 +Node: Library version6778 +Node: Buffering9329 +Node: Parameter limits10554 +Node: Compression functions11508 +Ref: member_size13301 +Ref: sync_flush15063 +Node: Decompression functions19751 +Node: Error codes27308 +Node: Error messages29598 +Node: Invoking minilzip30177 +Node: Data format40595 +Ref: coded-dict-size42041 +Node: Examples43446 +Node: Buffer compression44407 +Node: Buffer decompression45927 +Node: File compression47341 +Node: File decompression48324 +Node: File compression mm49328 +Node: Skipping data errors52357 +Node: Problems53662 +Node: Concept index54223 + +End Tag Table + + +Local Variables: +coding: iso-8859-15 +End: |