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liblzma: Rename EROFS LZMA to MicroLZMA. 

It still exists primarily for EROFS but MicroLZMA is
a more generic name (that hopefully doesn't clash with
something that already exists).
This commit is contained in:
Lasse Collin 2021-09-05 20:38:12 +03:00
parent 3247e95115
commit d267d109c3
4 changed files with 52 additions and 47 deletions
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33
src/liblzma/api/lzma/container.h
View File

@ -445,18 +445,18 @@ extern LZMA_API(lzma_ret) lzma_stream_buffer_encode(
/**
* \brief EROFS LZMA encoder
* \brief MicroLZMA encoder
*
* The EROFS LZMA format is a raw LZMA stream whose first byte (always 0x00)
* The MicroLZMA format is a raw LZMA stream whose first byte (always 0x00)
* has been replaced with bitwise-negation of the LZMA properties (lc/lp/pb).
* This encoding ensures that the first byte of EROFS LZMA stream is never
* This encoding ensures that the first byte of MicroLZMA stream is never
* 0x00. There is no end of payload marker and thus the uncompressed size
* must be stored separately. For the best error detection the dictionary
* size should be stored separately as well but alternatively one may use
* the uncompressed size as the dictionary size when decoding.
*
* With the EROFS LZMA encoder, lzma_code() behaves slightly unusually.
* The action argument must be LZMA_FINISH and the return value cannot be
* With the MicroLZMA encoder, lzma_code() behaves slightly unusually.
* The action argument must be LZMA_FINISH and the return value will never be
* LZMA_OK. Thus the encoding is always done with a single lzma_code() after
* the initialization. The benefit of the combination of initialization
* function and lzma_code() is that memory allocations can be re-used for
@ -479,6 +479,11 @@ extern LZMA_API(lzma_ret) lzma_stream_buffer_encode(
* size is 4 KiB, dictionary size of 32 KiB or 64 KiB is good. If the
* data compresses extremely well, even 128 KiB may be useful.
*
* The MicroLZMA format and this encoder variant were made with the EROFS
* file system in mind. This format may be convenient in other embedded
* uses too where many small streams are needed. XZ Embedded includes a
* decoder for this format.
*
* \return - LZMA_STREAM_END: All good. Check the amounts of input used
* and output produced. Store the amount of input used
* (uncompressed size) as it needs to be known to decompress
@ -487,9 +492,9 @@ extern LZMA_API(lzma_ret) lzma_stream_buffer_encode(
* - LZMA_MEM_ERROR
* - LZMA_PROG_ERROR: In addition to the generic reasons for this
* error code, this may also be returned if there isn't enough
* output space (6 bytes) to create a valid EROFS LZMA stream.
* output space (6 bytes) to create a valid MicroLZMA stream.
*/
extern LZMA_API(lzma_ret) lzma_erofs_encoder(
extern LZMA_API(lzma_ret) lzma_microlzma_encoder(
lzma_stream *strm, const lzma_options_lzma *options);
@ -682,17 +687,17 @@ extern LZMA_API(lzma_ret) lzma_stream_buffer_decode(
/**
* \brief EROFS LZMA decoder
* \brief MicroLZMA decoder
*
* See lzma_erofs_decoder() for more information.
* See lzma_microlzma_decoder() for more information.
*
* The lzma_code() usage with this decoder is completely normal.
* The special behavior of lzma_code() applies to lzma_erofs_encoder() only.
* The lzma_code() usage with this decoder is completely normal. The
* special behavior of lzma_code() applies to lzma_microlzma_encoder() only.
*
* \param strm Pointer to properly prepared lzma_stream
* \param comp_size Compressed size of the EROFS LZMA stream.
* \param comp_size Compressed size of the MicroLZMA stream.
* The caller must somehow know this exactly.
* \param uncomp_size Uncompressed size of the EROFS LZMA stream.
* \param uncomp_size Uncompressed size of the MicroLZMA stream.
* If the exact uncompressed size isn't known, this
* can be set to a value that is at most as big as
* the exact uncompressed size would be, but then the
@ -715,7 +720,7 @@ extern LZMA_API(lzma_ret) lzma_stream_buffer_decode(
* affect the memory usage if one specifies bigger
* dictionary than actually required.)
*/
extern LZMA_API(lzma_ret) lzma_erofs_decoder(
extern LZMA_API(lzma_ret) lzma_microlzma_decoder(
lzma_stream *strm, uint64_t comp_size,
uint64_t uncomp_size, lzma_bool uncomp_size_is_exact,
uint32_t dict_size);

4
src/liblzma/common/Makefile.inc
View File

@ -36,7 +36,7 @@ liblzma_la_SOURCES += \
common/easy_buffer_encoder.c \
common/easy_encoder.c \
common/easy_encoder_memusage.c \
common/erofs_encoder.c \
common/microlzma_encoder.c \
common/filter_buffer_encoder.c \
common/filter_encoder.c \
common/filter_encoder.h \
@ -66,7 +66,7 @@ liblzma_la_SOURCES += \
common/block_decoder.h \
common/block_header_decoder.c \
common/easy_decoder_memusage.c \
common/erofs_decoder.c \
common/microlzma_decoder.c \
common/file_info.c \
common/filter_buffer_decoder.c \
common/filter_decoder.c \

32
src/liblzma/common/erofs_decoder.c → src/liblzma/common/microlzma_decoder.c
View File

@ -1,7 +1,7 @@
///////////////////////////////////////////////////////////////////////////////
//
/// \file erofs_decoder.c
/// \brief Decode EROFS LZMA format
/// \file microlzma_decoder.c
/// \brief Decode MicroLZMA format
//
// Author: Lasse Collin
//
@ -39,19 +39,19 @@ typedef struct {
/// uncomp_size may never be bigger than the real uncompressed size.
bool uncomp_size_is_exact;
/// True once the first byte of the EROFS LZMA stream
/// True once the first byte of the MicroLZMA stream
/// has been processed.
bool props_decoded;
} lzma_erofs_coder;
} lzma_microlzma_coder;
static lzma_ret
erofs_decode(void *coder_ptr, const lzma_allocator *allocator,
microlzma_decode(void *coder_ptr, const lzma_allocator *allocator,
const uint8_t *restrict in, size_t *restrict in_pos,
size_t in_size, uint8_t *restrict out,
size_t *restrict out_pos, size_t out_size, lzma_action action)
{
lzma_erofs_coder *coder = coder_ptr;
lzma_microlzma_coder *coder = coder_ptr;
// Remember the in start position so that we can update comp_size.
const size_t in_start = *in_pos;
@ -157,9 +157,9 @@ erofs_decode(void *coder_ptr, const lzma_allocator *allocator,
static void
erofs_decoder_end(void *coder_ptr, const lzma_allocator *allocator)
microlzma_decoder_end(void *coder_ptr, const lzma_allocator *allocator)
{
lzma_erofs_coder *coder = coder_ptr;
lzma_microlzma_coder *coder = coder_ptr;
lzma_next_end(&coder->lzma, allocator);
lzma_free(coder, allocator);
return;
@ -167,23 +167,23 @@ erofs_decoder_end(void *coder_ptr, const lzma_allocator *allocator)
static lzma_ret
erofs_decoder_init(lzma_next_coder *next, const lzma_allocator *allocator,
microlzma_decoder_init(lzma_next_coder *next, const lzma_allocator *allocator,
uint64_t comp_size,
uint64_t uncomp_size, bool uncomp_size_is_exact,
uint32_t dict_size)
{
lzma_next_coder_init(&erofs_decoder_init, next, allocator);
lzma_next_coder_init(&microlzma_decoder_init, next, allocator);
lzma_erofs_coder *coder = next->coder;
lzma_microlzma_coder *coder = next->coder;
if (coder == NULL) {
coder = lzma_alloc(sizeof(lzma_erofs_coder), allocator);
coder = lzma_alloc(sizeof(lzma_microlzma_coder), allocator);
if (coder == NULL)
return LZMA_MEM_ERROR;
next->coder = coder;
next->code = &erofs_decode;
next->end = &erofs_decoder_end;
next->code = &microlzma_decode;
next->end = &microlzma_decoder_end;
coder->lzma = LZMA_NEXT_CODER_INIT;
}
@ -205,11 +205,11 @@ erofs_decoder_init(lzma_next_coder *next, const lzma_allocator *allocator,
extern LZMA_API(lzma_ret)
lzma_erofs_decoder(lzma_stream *strm, uint64_t comp_size,
lzma_microlzma_decoder(lzma_stream *strm, uint64_t comp_size,
uint64_t uncomp_size, lzma_bool uncomp_size_is_exact,
uint32_t dict_size)
{
lzma_next_strm_init(erofs_decoder_init, strm, comp_size,
lzma_next_strm_init(microlzma_decoder_init, strm, comp_size,
uncomp_size, uncomp_size_is_exact, dict_size);
strm->internal->supported_actions[LZMA_RUN] = true;

30
src/liblzma/common/erofs_encoder.c → src/liblzma/common/microlzma_encoder.c
View File

@ -1,7 +1,7 @@
///////////////////////////////////////////////////////////////////////////////
//
/// \file erofs_encoder.c
/// \brief Encode into EROFS LZMA format
/// \file microlzma_encoder.c
/// \brief Encode into MicroLZMA format
//
// Author: Lasse Collin
//
@ -19,16 +19,16 @@ typedef struct {
/// LZMA properties byte (lc/lp/pb)
uint8_t props;
} lzma_erofs_coder;
} lzma_microlzma_coder;
static lzma_ret
erofs_encode(void *coder_ptr, const lzma_allocator *allocator,
microlzma_encode(void *coder_ptr, const lzma_allocator *allocator,
const uint8_t *restrict in, size_t *restrict in_pos,
size_t in_size, uint8_t *restrict out,
size_t *restrict out_pos, size_t out_size, lzma_action action)
{
lzma_erofs_coder *coder = coder_ptr;
lzma_microlzma_coder *coder = coder_ptr;
// Remember *out_pos so that we can overwrite the first byte with
// the LZMA properties byte.
@ -80,9 +80,9 @@ erofs_encode(void *coder_ptr, const lzma_allocator *allocator,
static void
erofs_encoder_end(void *coder_ptr, const lzma_allocator *allocator)
microlzma_encoder_end(void *coder_ptr, const lzma_allocator *allocator)
{
lzma_erofs_coder *coder = coder_ptr;
lzma_microlzma_coder *coder = coder_ptr;
lzma_next_end(&coder->lzma, allocator);
lzma_free(coder, allocator);
return;
@ -90,21 +90,21 @@ erofs_encoder_end(void *coder_ptr, const lzma_allocator *allocator)
static lzma_ret
erofs_encoder_init(lzma_next_coder *next, const lzma_allocator *allocator,
microlzma_encoder_init(lzma_next_coder *next, const lzma_allocator *allocator,
const lzma_options_lzma *options)
{
lzma_next_coder_init(&erofs_encoder_init, next, allocator);
lzma_next_coder_init(&microlzma_encoder_init, next, allocator);
lzma_erofs_coder *coder = next->coder;
lzma_microlzma_coder *coder = next->coder;
if (coder == NULL) {
coder = lzma_alloc(sizeof(lzma_erofs_coder), allocator);
coder = lzma_alloc(sizeof(lzma_microlzma_coder), allocator);
if (coder == NULL)
return LZMA_MEM_ERROR;
next->coder = coder;
next->code = &erofs_encode;
next->end = &erofs_encoder_end;
next->code = &microlzma_encode;
next->end = &microlzma_encoder_end;
coder->lzma = LZMA_NEXT_CODER_INIT;
}
@ -128,9 +128,9 @@ erofs_encoder_init(lzma_next_coder *next, const lzma_allocator *allocator,
extern LZMA_API(lzma_ret)
lzma_erofs_encoder(lzma_stream *strm, const lzma_options_lzma *options)
lzma_microlzma_encoder(lzma_stream *strm, const lzma_options_lzma *options)
{
lzma_next_strm_init(erofs_encoder_init, strm, options);
lzma_next_strm_init(microlzma_encoder_init, strm, options);
strm->internal->supported_actions[LZMA_FINISH] = true;