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liblzma: Improve documentation for container.h 

Standardizing each function to always specify parameters and return
values. Also moved the parameters and return values to the end of each
function description.
This commit is contained in:
Jia Tan 2023-01-26 23:16:34 +08:00
parent b9a3511bb6
commit b8331077c6
1 changed files with 93 additions and 53 deletions
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146
src/liblzma/api/lzma/container.h
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@ -294,6 +294,15 @@ extern LZMA_API(uint64_t) lzma_easy_decoder_memusage(uint32_t preset)
* This function is intended for those who just want to use the basic features * This function is intended for those who just want to use the basic features
* if liblzma (that is, most developers out there). * if liblzma (that is, most developers out there).
* *
* If initialization fails (return value is not LZMA_OK), all the memory
* allocated for *strm by liblzma is always freed. Thus, there is no need
* to call lzma_end() after failed initialization.
*
* If initialization succeeds, use lzma_code() to do the actual encoding.
* Valid values for `action' (the second argument of lzma_code()) are
* LZMA_RUN, LZMA_SYNC_FLUSH, LZMA_FULL_FLUSH, and LZMA_FINISH. In future,
* there may be compression levels or flags that don't support LZMA_SYNC_FLUSH.
*
* \param strm Pointer to lzma_stream that is at least initialized * \param strm Pointer to lzma_stream that is at least initialized
* with LZMA_STREAM_INIT. * with LZMA_STREAM_INIT.
* \param preset Compression preset to use. A preset consist of level * \param preset Compression preset to use. A preset consist of level
@ -308,7 +317,8 @@ extern LZMA_API(uint64_t) lzma_easy_decoder_memusage(uint32_t preset)
* unsure. LZMA_CHECK_CRC32 is good too as long as the * unsure. LZMA_CHECK_CRC32 is good too as long as the
* uncompressed file is not many gigabytes. * uncompressed file is not many gigabytes.
* *
* \return - LZMA_OK: Initialization succeeded. Use lzma_code() to * \return Possible lzma_ret values:
* - LZMA_OK: Initialization succeeded. Use lzma_code() to
* encode your data. * encode your data.
* - LZMA_MEM_ERROR: Memory allocation failed. * - LZMA_MEM_ERROR: Memory allocation failed.
* - LZMA_OPTIONS_ERROR: The given compression preset is not * - LZMA_OPTIONS_ERROR: The given compression preset is not
@ -317,15 +327,6 @@ extern LZMA_API(uint64_t) lzma_easy_decoder_memusage(uint32_t preset)
* supported by this liblzma build. * supported by this liblzma build.
* - LZMA_PROG_ERROR: One or more of the parameters have values * - LZMA_PROG_ERROR: One or more of the parameters have values
* that will never be valid. For example, strm == NULL. * that will never be valid. For example, strm == NULL.
*
* If initialization fails (return value is not LZMA_OK), all the memory
* allocated for *strm by liblzma is always freed. Thus, there is no need
* to call lzma_end() after failed initialization.
*
* If initialization succeeds, use lzma_code() to do the actual encoding.
* Valid values for `action' (the second argument of lzma_code()) are
* LZMA_RUN, LZMA_SYNC_FLUSH, LZMA_FULL_FLUSH, and LZMA_FINISH. In future,
* there may be compression levels or flags that don't support LZMA_SYNC_FLUSH.
*/ */
extern LZMA_API(lzma_ret) lzma_easy_encoder( extern LZMA_API(lzma_ret) lzma_easy_encoder(
lzma_stream *strm, uint32_t preset, lzma_check check) lzma_stream *strm, uint32_t preset, lzma_check check)
@ -346,13 +347,14 @@ extern LZMA_API(lzma_ret) lzma_easy_encoder(
* Set to NULL to use malloc() and free(). * Set to NULL to use malloc() and free().
* \param in Beginning of the input buffer * \param in Beginning of the input buffer
* \param in_size Size of the input buffer * \param in_size Size of the input buffer
* \param out Beginning of the output buffer * \param[out] out Beginning of the output buffer
* \param out_pos The next byte will be written to out[*out_pos]. * \param[out] out_pos The next byte will be written to out[*out_pos].
* *out_pos is updated only if encoding succeeds. * *out_pos is updated only if encoding succeeds.
* \param out_size Size of the out buffer; the first byte into * \param out_size Size of the out buffer; the first byte into
* which no data is written to is out[out_size]. * which no data is written to is out[out_size].
* *
* \return - LZMA_OK: Encoding was successful. * \return Possible lzma_ret values:
* - LZMA_OK: Encoding was successful.
* - LZMA_BUF_ERROR: Not enough output buffer space. * - LZMA_BUF_ERROR: Not enough output buffer space.
* - LZMA_UNSUPPORTED_CHECK * - LZMA_UNSUPPORTED_CHECK
* - LZMA_OPTIONS_ERROR * - LZMA_OPTIONS_ERROR
@ -370,14 +372,16 @@ extern LZMA_API(lzma_ret) lzma_easy_buffer_encode(
/** /**
* \brief Initialize .xz Stream encoder using a custom filter chain * \brief Initialize .xz Stream encoder using a custom filter chain
* *
* \param strm Pointer to properly prepared lzma_stream * \param strm Pointer to lzma_stream that is at least initialized
* with LZMA_STREAM_INIT.
* \param filters Array of filters. This must be terminated with * \param filters Array of filters. This must be terminated with
* filters[n].id = LZMA_VLI_UNKNOWN. See filter.h for * filters[n].id = LZMA_VLI_UNKNOWN. See filter.h for
* more information. * more information.
* \param check Type of the integrity check to calculate from * \param check Type of the integrity check to calculate from
* uncompressed data. * uncompressed data.
* *
* \return - LZMA_OK: Initialization was successful. * \return Possible lzma_ret values:
* - LZMA_OK: Initialization was successful.
* - LZMA_MEM_ERROR * - LZMA_MEM_ERROR
* - LZMA_UNSUPPORTED_CHECK * - LZMA_UNSUPPORTED_CHECK
* - LZMA_OPTIONS_ERROR * - LZMA_OPTIONS_ERROR
@ -417,10 +421,12 @@ extern LZMA_API(uint64_t) lzma_stream_encoder_mt_memusage(
* LZMA_FULL_BARRIER, and LZMA_FINISH. Support for LZMA_SYNC_FLUSH might be * LZMA_FULL_BARRIER, and LZMA_FINISH. Support for LZMA_SYNC_FLUSH might be
* added in the future. * added in the future.
* *
* \param strm Pointer to properly prepared lzma_stream * \param strm Pointer to lzma_stream that is at least initialized
* with LZMA_STREAM_INIT.
* \param options Pointer to multithreaded compression options * \param options Pointer to multithreaded compression options
* *
* \return - LZMA_OK * \return Possible lzma_ret values:
* - LZMA_OK
* - LZMA_MEM_ERROR * - LZMA_MEM_ERROR
* - LZMA_UNSUPPORTED_CHECK * - LZMA_UNSUPPORTED_CHECK
* - LZMA_OPTIONS_ERROR * - LZMA_OPTIONS_ERROR
@ -446,7 +452,12 @@ extern LZMA_API(lzma_ret) lzma_stream_encoder_mt(
* No kind of flushing is supported, because the file format doesn't make * No kind of flushing is supported, because the file format doesn't make
* it possible. * it possible.
* *
* \return - LZMA_OK * \param strm Pointer to lzma_stream that is at least initialized
* with LZMA_STREAM_INIT.
* \param options Pointer to encoder options
*
* \return Possible lzma_ret values:
* - LZMA_OK
* - LZMA_MEM_ERROR * - LZMA_MEM_ERROR
* - LZMA_OPTIONS_ERROR * - LZMA_OPTIONS_ERROR
* - LZMA_PROG_ERROR * - LZMA_PROG_ERROR
@ -477,6 +488,11 @@ extern LZMA_API(lzma_ret) lzma_alone_encoder(
* will) have larger maximum expansion when encoding * will) have larger maximum expansion when encoding
* uncompressible data. Currently there is no function to * uncompressible data. Currently there is no function to
* calculate the maximum expansion of multi-call encoding. * calculate the maximum expansion of multi-call encoding.
*
* \param uncompressed_size Size in bytes of the uncompressed
* input data
*
* \return Maximum number of bytes needed to store the compressed data.
*/ */
extern LZMA_API(size_t) lzma_stream_buffer_bound(size_t uncompressed_size) extern LZMA_API(size_t) lzma_stream_buffer_bound(size_t uncompressed_size)
lzma_nothrow; lzma_nothrow;
@ -494,13 +510,14 @@ extern LZMA_API(size_t) lzma_stream_buffer_bound(size_t uncompressed_size)
* Set to NULL to use malloc() and free(). * Set to NULL to use malloc() and free().
* \param in Beginning of the input buffer * \param in Beginning of the input buffer
* \param in_size Size of the input buffer * \param in_size Size of the input buffer
* \param out Beginning of the output buffer * \param[out] out Beginning of the output buffer
* \param out_pos The next byte will be written to out[*out_pos]. * \param[out] out_pos The next byte will be written to out[*out_pos].
* *out_pos is updated only if encoding succeeds. * *out_pos is updated only if encoding succeeds.
* \param out_size Size of the out buffer; the first byte into * \param out_size Size of the out buffer; the first byte into
* which no data is written to is out[out_size]. * which no data is written to is out[out_size].
* *
* \return - LZMA_OK: Encoding was successful. * \return Possible lzma_ret values:
* - LZMA_OK: Encoding was successful.
* - LZMA_BUF_ERROR: Not enough output buffer space. * - LZMA_BUF_ERROR: Not enough output buffer space.
* - LZMA_UNSUPPORTED_CHECK * - LZMA_UNSUPPORTED_CHECK
* - LZMA_OPTIONS_ERROR * - LZMA_OPTIONS_ERROR
@ -556,7 +573,12 @@ extern LZMA_API(lzma_ret) lzma_stream_buffer_encode(
* uses too where many small streams are needed. XZ Embedded includes a * uses too where many small streams are needed. XZ Embedded includes a
* decoder for this format. * decoder for this format.
* *
* \return - LZMA_STREAM_END: All good. Check the amounts of input used * \param strm Pointer to lzma_stream that is at least initialized
* with LZMA_STREAM_INIT.
* \param options Pointer to encoder options
*
* \return Possible lzma_ret values:
* - LZMA_STREAM_END: All good. Check the amounts of input used
* and output produced. Store the amount of input used * and output produced. Store the amount of input used
* (uncompressed size) as it needs to be known to decompress * (uncompressed size) as it needs to be known to decompress
* the data. * the data.
@ -673,7 +695,8 @@ extern LZMA_API(lzma_ret) lzma_microlzma_encoder(
/** /**
* \brief Initialize .xz Stream decoder * \brief Initialize .xz Stream decoder
* *
* \param strm Pointer to properly prepared lzma_stream * \param strm Pointer to lzma_stream that is at least initialized
* with LZMA_STREAM_INIT.
* \param memlimit Memory usage limit as bytes. Use UINT64_MAX * \param memlimit Memory usage limit as bytes. Use UINT64_MAX
* to effectively disable the limiter. liblzma * to effectively disable the limiter. liblzma
* 5.2.3 and earlier don't allow 0 here and return * 5.2.3 and earlier don't allow 0 here and return
@ -684,7 +707,8 @@ extern LZMA_API(lzma_ret) lzma_microlzma_encoder(
* LZMA_TELL_ANY_CHECK, LZMA_IGNORE_CHECK, * LZMA_TELL_ANY_CHECK, LZMA_IGNORE_CHECK,
* LZMA_CONCATENATED, LZMA_FAIL_FAST * LZMA_CONCATENATED, LZMA_FAIL_FAST
* *
* \return - LZMA_OK: Initialization was successful. * \return Possible lzma_ret values:
* - LZMA_OK: Initialization was successful.
* - LZMA_MEM_ERROR: Cannot allocate memory. * - LZMA_MEM_ERROR: Cannot allocate memory.
* - LZMA_OPTIONS_ERROR: Unsupported flags * - LZMA_OPTIONS_ERROR: Unsupported flags
* - LZMA_PROG_ERROR * - LZMA_PROG_ERROR
@ -697,9 +721,6 @@ extern LZMA_API(lzma_ret) lzma_stream_decoder(
/** /**
* \brief Initialize multithreaded .xz Stream decoder * \brief Initialize multithreaded .xz Stream decoder
* *
* \param strm Pointer to properly prepared lzma_stream
* \param options Pointer to multithreaded compression options
*
* The decoder can decode multiple Blocks in parallel. This requires that each * The decoder can decode multiple Blocks in parallel. This requires that each
* Block Header contains the Compressed Size and Uncompressed size fields * Block Header contains the Compressed Size and Uncompressed size fields
* which are added by the multi-threaded encoder, see lzma_stream_encoder_mt(). * which are added by the multi-threaded encoder, see lzma_stream_encoder_mt().
@ -713,7 +734,12 @@ extern LZMA_API(lzma_ret) lzma_stream_decoder(
* This function behaves like lzma_stream_decoder() when options->threads == 1 * This function behaves like lzma_stream_decoder() when options->threads == 1
* and options->memlimit_threading <= 1. * and options->memlimit_threading <= 1.
* *
* \return - LZMA_OK: Initialization was successful. * \param strm Pointer to lzma_stream that is at least initialized
* with LZMA_STREAM_INIT.
* \param options Pointer to multithreaded compression options
*
* \return Possible lzma_ret values:
* - LZMA_OK: Initialization was successful.
* - LZMA_MEM_ERROR: Cannot allocate memory. * - LZMA_MEM_ERROR: Cannot allocate memory.
* - LZMA_MEMLIMIT_ERROR: Memory usage limit was reached. * - LZMA_MEMLIMIT_ERROR: Memory usage limit was reached.
* - LZMA_OPTIONS_ERROR: Unsupported flags. * - LZMA_OPTIONS_ERROR: Unsupported flags.
@ -740,7 +766,8 @@ extern LZMA_API(lzma_ret) lzma_stream_decoder_mt(
* as it doesn't support any decoder flags. It will return LZMA_STREAM_END * as it doesn't support any decoder flags. It will return LZMA_STREAM_END
* after one .lzma stream.) * after one .lzma stream.)
* *
* \param strm Pointer to properly prepared lzma_stream * \param strm Pointer to lzma_stream that is at least initialized
* with LZMA_STREAM_INIT.
* \param memlimit Memory usage limit as bytes. Use UINT64_MAX * \param memlimit Memory usage limit as bytes. Use UINT64_MAX
* to effectively disable the limiter. liblzma * to effectively disable the limiter. liblzma
* 5.2.3 and earlier don't allow 0 here and return * 5.2.3 and earlier don't allow 0 here and return
@ -751,7 +778,8 @@ extern LZMA_API(lzma_ret) lzma_stream_decoder_mt(
* LZMA_TELL_ANY_CHECK, LZMA_IGNORE_CHECK, * LZMA_TELL_ANY_CHECK, LZMA_IGNORE_CHECK,
* LZMA_CONCATENATED, LZMA_FAIL_FAST * LZMA_CONCATENATED, LZMA_FAIL_FAST
* *
* \return - LZMA_OK: Initialization was successful. * \return Possible lzma_ret values:
* - LZMA_OK: Initialization was successful.
* - LZMA_MEM_ERROR: Cannot allocate memory. * - LZMA_MEM_ERROR: Cannot allocate memory.
* - LZMA_OPTIONS_ERROR: Unsupported flags * - LZMA_OPTIONS_ERROR: Unsupported flags
* - LZMA_PROG_ERROR * - LZMA_PROG_ERROR
@ -764,18 +792,20 @@ extern LZMA_API(lzma_ret) lzma_auto_decoder(
/** /**
* \brief Initialize .lzma decoder (legacy file format) * \brief Initialize .lzma decoder (legacy file format)
* *
* \param strm Pointer to properly prepared lzma_stream * Valid `action' arguments to lzma_code() are LZMA_RUN and LZMA_FINISH.
* There is no need to use LZMA_FINISH, but it's allowed because it may
* simplify certain types of applications.
*
* \param strm Pointer to lzma_stream that is at least initialized
* with LZMA_STREAM_INIT.
* \param memlimit Memory usage limit as bytes. Use UINT64_MAX * \param memlimit Memory usage limit as bytes. Use UINT64_MAX
* to effectively disable the limiter. liblzma * to effectively disable the limiter. liblzma
* 5.2.3 and earlier don't allow 0 here and return * 5.2.3 and earlier don't allow 0 here and return
* LZMA_PROG_ERROR; later versions treat 0 as if 1 * LZMA_PROG_ERROR; later versions treat 0 as if 1
* had been specified. * had been specified.
* *
* Valid `action' arguments to lzma_code() are LZMA_RUN and LZMA_FINISH. * \return Possible lzma_ret values:
* There is no need to use LZMA_FINISH, but it's allowed because it may * - LZMA_OK
* simplify certain types of applications.
*
* \return - LZMA_OK
* - LZMA_MEM_ERROR * - LZMA_MEM_ERROR
* - LZMA_PROG_ERROR * - LZMA_PROG_ERROR
*/ */
@ -787,18 +817,6 @@ extern LZMA_API(lzma_ret) lzma_alone_decoder(
/** /**
* \brief Initialize .lz (lzip) decoder (a foreign file format) * \brief Initialize .lz (lzip) decoder (a foreign file format)
* *
* \param strm Pointer to properly prepared lzma_stream
* \param memlimit Memory usage limit as bytes. Use UINT64_MAX
* to effectively disable the limiter.
* \param flags Bitwise-or of flags, or zero for no flags.
* All decoder flags listed above are supported
* although only LZMA_CONCATENATED and (in very rare
* cases) LZMA_IGNORE_CHECK are actually useful.
* LZMA_TELL_NO_CHECK, LZMA_TELL_UNSUPPORTED_CHECK,
* and LZMA_FAIL_FAST do nothing. LZMA_TELL_ANY_CHECK
* is supported for consistency only as CRC32 is
* always used in the .lz format.
*
* This decoder supports the .lz format version 0 and the unextended .lz * This decoder supports the .lz format version 0 and the unextended .lz
* format version 1: * format version 1:
* *
@ -832,7 +850,21 @@ extern LZMA_API(lzma_ret) lzma_alone_decoder(
* one should ensure that none of the first four bytes of trailing data are * one should ensure that none of the first four bytes of trailing data are
* equal to the magic bytes because lzip >= 1.20 requires it by default. * equal to the magic bytes because lzip >= 1.20 requires it by default.
* *
* \return - LZMA_OK: Initialization was successful. * \param strm Pointer to lzma_stream that is at least initialized
* with LZMA_STREAM_INIT.
* \param memlimit Memory usage limit as bytes. Use UINT64_MAX
* to effectively disable the limiter.
* \param flags Bitwise-or of flags, or zero for no flags.
* All decoder flags listed above are supported
* although only LZMA_CONCATENATED and (in very rare
* cases) LZMA_IGNORE_CHECK are actually useful.
* LZMA_TELL_NO_CHECK, LZMA_TELL_UNSUPPORTED_CHECK,
* and LZMA_FAIL_FAST do nothing. LZMA_TELL_ANY_CHECK
* is supported for consistency only as CRC32 is
* always used in the .lz format.
*
* \return Possible lzma_ret values:
* - LZMA_OK: Initialization was successful.
* - LZMA_MEM_ERROR: Cannot allocate memory. * - LZMA_MEM_ERROR: Cannot allocate memory.
* - LZMA_OPTIONS_ERROR: Unsupported flags * - LZMA_OPTIONS_ERROR: Unsupported flags
* - LZMA_PROG_ERROR * - LZMA_PROG_ERROR
@ -861,13 +893,14 @@ extern LZMA_API(lzma_ret) lzma_lzip_decoder(
* *in_pos is updated only if decoding succeeds. * *in_pos is updated only if decoding succeeds.
* \param in_size Size of the input buffer; the first byte that * \param in_size Size of the input buffer; the first byte that
* won't be read is in[in_size]. * won't be read is in[in_size].
* \param out Beginning of the output buffer * \param[out] out Beginning of the output buffer
* \param out_pos The next byte will be written to out[*out_pos]. * \param[out] out_pos The next byte will be written to out[*out_pos].
* *out_pos is updated only if decoding succeeds. * *out_pos is updated only if decoding succeeds.
* \param out_size Size of the out buffer; the first byte into * \param out_size Size of the out buffer; the first byte into
* which no data is written to is out[out_size]. * which no data is written to is out[out_size].
* *
* \return - LZMA_OK: Decoding was successful. * \return Possible lzma_ret values:
* - LZMA_OK: Decoding was successful.
* - LZMA_FORMAT_ERROR * - LZMA_FORMAT_ERROR
* - LZMA_OPTIONS_ERROR * - LZMA_OPTIONS_ERROR
* - LZMA_DATA_ERROR * - LZMA_DATA_ERROR
@ -897,7 +930,8 @@ extern LZMA_API(lzma_ret) lzma_stream_buffer_decode(
* The lzma_code() usage with this decoder is completely normal. The * The lzma_code() usage with this decoder is completely normal. The
* special behavior of lzma_code() applies to lzma_microlzma_encoder() only. * special behavior of lzma_code() applies to lzma_microlzma_encoder() only.
* *
* \param strm Pointer to properly prepared lzma_stream * \param strm Pointer to lzma_stream that is at least initialized
* with LZMA_STREAM_INIT.
* \param comp_size Compressed size of the MicroLZMA stream. * \param comp_size Compressed size of the MicroLZMA stream.
* The caller must somehow know this exactly. * The caller must somehow know this exactly.
* \param uncomp_size Uncompressed size of the MicroLZMA stream. * \param uncomp_size Uncompressed size of the MicroLZMA stream.
@ -922,6 +956,12 @@ extern LZMA_API(lzma_ret) lzma_stream_buffer_decode(
* the implementation in XZ Embedded it doesn't * the implementation in XZ Embedded it doesn't
* affect the memory usage if one specifies bigger * affect the memory usage if one specifies bigger
* dictionary than actually required.) * dictionary than actually required.)
*
* \return Possible lzma_ret values:
* - LZMA_OK
* - LZMA_MEM_ERROR
* - LZMA_OPTIONS_ERROR
* - LZMA_PROG_ERROR
*/ */
extern LZMA_API(lzma_ret) lzma_microlzma_decoder( extern LZMA_API(lzma_ret) lzma_microlzma_decoder(
lzma_stream *strm, uint64_t comp_size, lzma_stream *strm, uint64_t comp_size,