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liblzma: Improve documentation for stream_flags.h

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Standardizing each function to always specify parameters and return
values. Also moved the parameters and return values to the end of each
function description.

A few small things were reworded and long sentences broken up.
This commit is contained in:
Jia Tan 2023-02-16 21:04:54 +08:00
parent 2796bb4736
commit d83da006b3
1 changed files with 46 additions and 30 deletions
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76
src/liblzma/api/lzma/stream_flags.h
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@ -68,7 +68,15 @@ typedef struct {
* Footer have been decoded.
*/
lzma_vli backward_size;
/**
* \brief Minimum size of the backward_size field
*/
# define LZMA_BACKWARD_SIZE_MIN 4
/**
* \brief Maximum size of the backward_size field
*/
# define LZMA_BACKWARD_SIZE_MAX (LZMA_VLI_C(1) << 34)
/**
@ -140,10 +148,11 @@ typedef struct {
* \param options Stream Header options to be encoded.
* options->backward_size is ignored and doesn't
* need to be initialized.
* \param out Beginning of the output buffer of
* \param[out] out Beginning of the output buffer of
* LZMA_STREAM_HEADER_SIZE bytes.
*
* \return - LZMA_OK: Encoding was successful.
* \return Possible lzma_ret values:
* - LZMA_OK: Encoding was successful.
* - LZMA_OPTIONS_ERROR: options->version is not supported by
* this liblzma version.
* - LZMA_PROG_ERROR: Invalid options.
@ -157,10 +166,11 @@ extern LZMA_API(lzma_ret) lzma_stream_header_encode(
* \brief Encode Stream Footer
*
* \param options Stream Footer options to be encoded.
* \param out Beginning of the output buffer of
* \param[out] out Beginning of the output buffer of
* LZMA_STREAM_HEADER_SIZE bytes.
*
* \return - LZMA_OK: Encoding was successful.
* \return Possible lzma_ret values:
* - LZMA_OK: Encoding was successful.
* - LZMA_OPTIONS_ERROR: options->version is not supported by
* this liblzma version.
* - LZMA_PROG_ERROR: Invalid options.
@ -173,32 +183,33 @@ extern LZMA_API(lzma_ret) lzma_stream_footer_encode(
/**
* \brief Decode Stream Header
*
* \param options Target for the decoded Stream Header options.
* \param in Beginning of the input buffer of
* LZMA_STREAM_HEADER_SIZE bytes.
*
* options->backward_size is always set to LZMA_VLI_UNKNOWN. This is to
* help comparing Stream Flags from Stream Header and Stream Footer with
* lzma_stream_flags_compare().
*
* \return - LZMA_OK: Decoding was successful.
* \note When decoding .xz files that contain multiple Streams, it may
* make sense to print "file format not recognized" only if
* decoding of the Stream Header of the \a first Stream gives
* LZMA_FORMAT_ERROR. If non-first Stream Header gives
* LZMA_FORMAT_ERROR, the message used for LZMA_DATA_ERROR is
* probably more appropriate.
* For example, the Stream decoder in liblzma uses
* LZMA_DATA_ERROR if LZMA_FORMAT_ERROR is returned by
* lzma_stream_header_decode() when decoding non-first Stream.
*
* \param[out] options Target for the decoded Stream Header options.
* \param in Beginning of the input buffer of
* LZMA_STREAM_HEADER_SIZE bytes.
*
*
* \return Possible lzma_ret values:
* - LZMA_OK: Decoding was successful.
* - LZMA_FORMAT_ERROR: Magic bytes don't match, thus the given
* buffer cannot be Stream Header.
* - LZMA_DATA_ERROR: CRC32 doesn't match, thus the header
* is corrupt.
* - LZMA_OPTIONS_ERROR: Unsupported options are present
* in the header.
*
* \note When decoding .xz files that contain multiple Streams, it may
* make sense to print "file format not recognized" only if
* decoding of the Stream Header of the _first_ Stream gives
* LZMA_FORMAT_ERROR. If non-first Stream Header gives
* LZMA_FORMAT_ERROR, the message used for LZMA_DATA_ERROR is
* probably more appropriate.
*
* For example, Stream decoder in liblzma uses LZMA_DATA_ERROR if
* LZMA_FORMAT_ERROR is returned by lzma_stream_header_decode()
* when decoding non-first Stream.
*/
extern LZMA_API(lzma_ret) lzma_stream_header_decode(
lzma_stream_flags *options, const uint8_t *in)
@ -208,24 +219,25 @@ extern LZMA_API(lzma_ret) lzma_stream_header_decode(
/**
* \brief Decode Stream Footer
*
* \param options Target for the decoded Stream Header options.
* \note If Stream Header was already decoded successfully, but
* decoding Stream Footer returns LZMA_FORMAT_ERROR, the
* application should probably report some other error message
* than "file format not recognized". The file likely
* is corrupt (possibly truncated). The Stream decoder in liblzma
* uses LZMA_DATA_ERROR in this situation.
*
* \param[out] options Target for the decoded Stream Footer options.
* \param in Beginning of the input buffer of
* LZMA_STREAM_HEADER_SIZE bytes.
*
* \return - LZMA_OK: Decoding was successful.
* \return Possible lzma_ret values:
* - LZMA_OK: Decoding was successful.
* - LZMA_FORMAT_ERROR: Magic bytes don't match, thus the given
* buffer cannot be Stream Footer.
* - LZMA_DATA_ERROR: CRC32 doesn't match, thus the Stream Footer
* is corrupt.
* - LZMA_OPTIONS_ERROR: Unsupported options are present
* in Stream Footer.
*
* \note If Stream Header was already decoded successfully, but
* decoding Stream Footer returns LZMA_FORMAT_ERROR, the
* application should probably report some other error message
* than "file format not recognized", since the file more likely
* is corrupt (possibly truncated). Stream decoder in liblzma
* uses LZMA_DATA_ERROR in this situation.
*/
extern LZMA_API(lzma_ret) lzma_stream_footer_decode(
lzma_stream_flags *options, const uint8_t *in)
@ -238,7 +250,11 @@ extern LZMA_API(lzma_ret) lzma_stream_footer_decode(
* backward_size values are compared only if both are not
* LZMA_VLI_UNKNOWN.
*
* \return - LZMA_OK: Both are equal. If either had backward_size set
* \param a Pointer to lzma_stream_flags structure
* \param b Pointer to lzma_stream_flags structure
*
* \return Possible lzma_ret values:
* - LZMA_OK: Both are equal. If either had backward_size set
* to LZMA_VLI_UNKNOWN, backward_size values were not
* compared or validated.
* - LZMA_DATA_ERROR: The structures differ.