diff options
Diffstat (limited to '')
| -rw-r--r-- | src/liblzma/api/lzma/lzma12.h | 123 | ||||
| -rw-r--r-- | src/liblzma/common/filter_common.c | 7 | ||||
| -rw-r--r-- | src/liblzma/common/filter_decoder.c | 6 | ||||
| -rw-r--r-- | src/liblzma/common/filter_encoder.c | 9 | ||||
| -rw-r--r-- | src/liblzma/lzma/lzma2_encoder.c | 2 | ||||
| -rw-r--r-- | src/liblzma/lzma/lzma_decoder.c | 26 | ||||
| -rw-r--r-- | src/liblzma/lzma/lzma_encoder.c | 40 | ||||
| -rw-r--r-- | src/liblzma/lzma/lzma_encoder.h | 3 | ||||
| -rw-r--r-- | src/liblzma/lzma/lzma_encoder_private.h | 3 |
9 files changed, 204 insertions, 15 deletions
diff --git a/src/liblzma/api/lzma/lzma12.h b/src/liblzma/api/lzma/lzma12.h index df5f23b6..d34e7839 100644 --- a/src/liblzma/api/lzma/lzma12.h +++ b/src/liblzma/api/lzma/lzma12.h @@ -18,18 +18,41 @@ /** - * \brief LZMA1 Filter ID + * \brief LZMA1 Filter ID (for raw encoder/decoder only, not in .xz) * * LZMA1 is the very same thing as what was called just LZMA in LZMA Utils, * 7-Zip, and LZMA SDK. It's called LZMA1 here to prevent developers from * accidentally using LZMA when they actually want LZMA2. - * - * LZMA1 shouldn't be used for new applications unless you _really_ know - * what you are doing. LZMA2 is almost always a better choice. */ #define LZMA_FILTER_LZMA1 LZMA_VLI_C(0x4000000000000001) /** + * \brief LZMA1 Filter ID with extended options (for raw encoder/decoder) + * + * This is like LZMA_FILTER_LZMA1 but with this ID a few extra options + * are supported in the lzma_options_lzma structure: + * + * - A flag to tell the encoder if the end of payload marker (EOPM) alias + * end of stream (EOS) marker must be written at the end of the stream. + * In contrast, LZMA_FILTER_LZMA1 always writes the end marker. + * + * - Decoder needs to be told the uncompressed size of the stream + * or that it is unknown (using the special value UINT64_MAX). + * If the size is known, a flag can be set to allow the presence of + * the end marker anyway. In contrast, LZMA_FILTER_LZMA1 always + * behaves as if the uncompressed size was unknown. + * + * This allows handling file formats where LZMA1 streams are used but where + * the end marker isn't allowed or where it might not (always) be present. + * This extended LZMA1 functionality is provided as a Filter ID for raw + * encoder and decoder instead of adding new encoder and decoder initialization + * functions because this way it is possible to also use extra filters, + * for example, LZMA_FILTER_X86 in a filter chain with LZMA_FILTER_LZMA1EXT, + * which might be needed to handle some file formats. + */ +#define LZMA_FILTER_LZMA1EXT LZMA_VLI_C(0x4000000000000002) + +/** * \brief LZMA2 Filter ID * * Usually you want this instead of LZMA1. Compared to LZMA1, LZMA2 adds @@ -374,6 +397,82 @@ typedef struct { */ uint32_t depth; + /** + * \brief For LZMA_FILTER_LZMA1EXT: Extended flags + * + * This is used only with LZMA_FILTER_LZMA1EXT. + * + * Currently only one flag is supported, LZMA_LZMA1EXT_ALLOW_EOPM: + * + * - Encoder: If the flag is set, then end marker is written just + * like it is with LZMA_FILTER_LZMA1. Without this flag the + * end marker isn't written and the application has to store + * the uncompressed size somewhere outside the compressed stream. + * To decompress streams without the end marker, the appliation + * has to set the correct uncompressed size in ext_size_low and + * ext_size_high. + * + * - Decoder: If the uncompressed size in ext_size_low and + * ext_size_high is set to the special value UINT64_MAX + * (indicating unknown uncompressed size) then this flag is + * ignored and the end marker must always be present, that is, + * the behavior is identical to LZMA_FILTER_LZMA1. + * + * Otherwise, if this flag isn't set, then the input stream + * must not have the end marker; if the end marker is detected + * then it will result in LZMA_DATA_ERROR. This is useful when + * it is known that the stream must not have the end marker and + * strict validation is wanted. + * + * If this flag is set, then it is autodetected if the end marker + * is present after the specified number of uncompressed bytes + * has been decompressed (ext_size_low and ext_size_high). The + * end marker isn't allowed in any other position. This behavior + * is useful when uncompressed size is known but the end marker + * may or may not be present. This is the case, for example, + * in .7z files (valid .7z files that have the end marker in + * LZMA1 streams are rare but they do exist). + */ + uint32_t ext_flags; +# define LZMA_LZMA1EXT_ALLOW_EOPM UINT32_C(0x01) + + /** + * \brief For LZMA_FILTER_LZMA1EXT: Uncompressed size (low bits) + * + * The 64-bit uncompressed size is needed for decompression with + * LZMA_FILTER_LZMA1EXT. The size is ignored by the encoder. + * + * The special value UINT64_MAX indicates that the uncompressed size + * is unknown and that the end of payload marker (also known as + * end of stream marker) must be present to indicate the end of + * the LZMA1 stream. Any other value indicates the expected + * uncompressed size of the LZMA1 stream. (If LZMA1 was used together + * with filters that change the size of the data then the uncompressed + * size of the LZMA1 stream could be different than the final + * uncompressed size of the filtered stream.) + * + * ext_size_low holds the least significant 32 bits of the + * uncompressed size. The most significant 32 bits must be set + * in ext_size_high. The macro lzma_ext_size_set(opt_lzma, u64size) + * can be used to set these members. + * + * The 64-bit uncompressed size is split into two uint32_t variables + * because there were no reserved uint64_t members and using the + * same options structure for LZMA_FILTER_LZMA1, LZMA_FILTER_LZMA1EXT, + * and LZMA_FILTER_LZMA2 was otherwise more convenient than having + * a new options structure for LZMA_FILTER_LZMA1EXT. (Replacing two + * uint32_t members with one uint64_t changes the ABI on some systems + * as the alignment of this struct can increase from 4 bytes to 8.) + */ + uint32_t ext_size_low; + + /** + * \brief For LZMA_FILTER_LZMA1EXT: Uncompressed size (high bits) + * + * This holds the most significant 32 bits of the uncompressed size. + */ + uint32_t ext_size_high; + /* * Reserved space to allow possible future extensions without * breaking the ABI. You should not touch these, because the names @@ -381,9 +480,6 @@ typedef struct { * with the currently supported options, so it is safe to leave these * uninitialized. */ - uint32_t reserved_int1; - uint32_t reserved_int2; - uint32_t reserved_int3; uint32_t reserved_int4; uint32_t reserved_int5; uint32_t reserved_int6; @@ -400,6 +496,19 @@ typedef struct { /** + * \brief Macro to set the 64-bit uncompressed size in ext_size_* + * + * This might be convenient when decoding using LZMA_FILTER_LZMA1EXT. + * This isn't used with LZMA_FILTER_LZMA1 or LZMA_FILTER_LZMA2. + */ +#define lzma_set_ext_size(opt_lzma2, u64size) \ +do { \ + (opt_lzma2).ext_size_low = (uint32_t)(u64size); \ + (opt_lzma2).ext_size_high = (uint32_t)((uint64_t)(u64size) >> 32); \ +} while (0) + + +/** * \brief Set a compression preset to lzma_options_lzma structure * * 0 is the fastest and 9 is the slowest. These match the switches -0 .. -9 diff --git a/src/liblzma/common/filter_common.c b/src/liblzma/common/filter_common.c index a803b4c2..c8694e2c 100644 --- a/src/liblzma/common/filter_common.c +++ b/src/liblzma/common/filter_common.c @@ -42,6 +42,13 @@ static const struct { .last_ok = true, .changes_size = true, }, + { + .id = LZMA_FILTER_LZMA1EXT, + .options_size = sizeof(lzma_options_lzma), + .non_last_ok = false, + .last_ok = true, + .changes_size = true, + }, #endif #if defined(HAVE_ENCODER_LZMA2) || defined(HAVE_DECODER_LZMA2) { diff --git a/src/liblzma/common/filter_decoder.c b/src/liblzma/common/filter_decoder.c index b031ac62..fa53f5bd 100644 --- a/src/liblzma/common/filter_decoder.c +++ b/src/liblzma/common/filter_decoder.c @@ -50,6 +50,12 @@ static const lzma_filter_decoder decoders[] = { .memusage = &lzma_lzma_decoder_memusage, .props_decode = &lzma_lzma_props_decode, }, + { + .id = LZMA_FILTER_LZMA1EXT, + .init = &lzma_lzma_decoder_init, + .memusage = &lzma_lzma_decoder_memusage, + .props_decode = &lzma_lzma_props_decode, + }, #endif #ifdef HAVE_DECODER_LZMA2 { diff --git a/src/liblzma/common/filter_encoder.c b/src/liblzma/common/filter_encoder.c index 5d6c1a7e..978b7a6b 100644 --- a/src/liblzma/common/filter_encoder.c +++ b/src/liblzma/common/filter_encoder.c @@ -64,6 +64,15 @@ static const lzma_filter_encoder encoders[] = { .props_size_fixed = 5, .props_encode = &lzma_lzma_props_encode, }, + { + .id = LZMA_FILTER_LZMA1EXT, + .init = &lzma_lzma_encoder_init, + .memusage = &lzma_lzma_encoder_memusage, + .block_size = NULL, // Not needed for LZMA1 + .props_size_get = NULL, + .props_size_fixed = 5, + .props_encode = &lzma_lzma_props_encode, + }, #endif #ifdef HAVE_ENCODER_LZMA2 { diff --git a/src/liblzma/lzma/lzma2_encoder.c b/src/liblzma/lzma/lzma2_encoder.c index f1252c57..4b6b2311 100644 --- a/src/liblzma/lzma/lzma2_encoder.c +++ b/src/liblzma/lzma/lzma2_encoder.c @@ -341,7 +341,7 @@ lzma2_encoder_init(lzma_lz_encoder *lz, const lzma_allocator *allocator, // Initialize LZMA encoder return_if_error(lzma_lzma_encoder_create(&coder->lzma, allocator, - &coder->opt_cur, lz_options)); + LZMA_FILTER_LZMA2, &coder->opt_cur, lz_options)); // Make sure that we will always have enough history available in // case we need to use uncompressed chunks. They are used when the diff --git a/src/liblzma/lzma/lzma_decoder.c b/src/liblzma/lzma/lzma_decoder.c index 550963d1..26c148a9 100644 --- a/src/liblzma/lzma/lzma_decoder.c +++ b/src/liblzma/lzma/lzma_decoder.c @@ -1018,11 +1018,35 @@ lzma_decoder_init(lzma_lz_decoder *lz, const lzma_allocator *allocator, if (!is_lclppb_valid(options)) return LZMA_PROG_ERROR; + lzma_vli uncomp_size = LZMA_VLI_UNKNOWN; + bool allow_eopm = true; + + if (id == LZMA_FILTER_LZMA1EXT) { + const lzma_options_lzma *opt = options; + + // Only one flag is supported. + if (opt->ext_flags & ~LZMA_LZMA1EXT_ALLOW_EOPM) + return LZMA_OPTIONS_ERROR; + + // FIXME? Using lzma_vli instead of uint64_t is weird because + // this has nothing to do with .xz headers and variable-length + // integer encoding. On the other hand, using LZMA_VLI_UNKNOWN + // instead of UINT64_MAX is clearer when unknown size is + // meant. A problem with using lzma_vli is that now we + // allow > LZMA_VLI_MAX which is fine in this file but + // it's still confusing. Note that alone_decoder.c also + // allows > LZMA_VLI_MAX when setting uncompressed size. + uncomp_size = opt->ext_size_low + + ((uint64_t)(opt->ext_size_high) << 32); + allow_eopm = (opt->ext_flags & LZMA_LZMA1EXT_ALLOW_EOPM) != 0 + || uncomp_size == LZMA_VLI_UNKNOWN; + } + return_if_error(lzma_lzma_decoder_create( lz, allocator, options, lz_options)); lzma_decoder_reset(lz->coder, options); - lzma_decoder_uncompressed(lz->coder, LZMA_VLI_UNKNOWN, true); + lzma_decoder_uncompressed(lz->coder, uncomp_size, allow_eopm); return LZMA_OK; } diff --git a/src/liblzma/lzma/lzma_encoder.c b/src/liblzma/lzma/lzma_encoder.c index e2dbbc03..dc62f44f 100644 --- a/src/liblzma/lzma/lzma_encoder.c +++ b/src/liblzma/lzma/lzma_encoder.c @@ -416,7 +416,7 @@ lzma_lzma_encode(lzma_lzma1_encoder *restrict coder, lzma_mf *restrict mf, // // Plain LZMA streams without EOPM aren't supported except when // output size limiting is enabled. - if (limit == UINT32_MAX && coder->out_limit == 0) + if (coder->use_eopm) encode_eopm(coder, (uint32_t)(coder->uncomp_size)); // Flush the remaining bytes from the range encoder. @@ -462,6 +462,7 @@ lzma_lzma_set_out_limit( lzma_lzma1_encoder *coder = coder_ptr; coder->out_limit = out_limit; coder->uncomp_size_ptr = uncomp_size; + coder->use_eopm = false; return LZMA_OK; } @@ -599,10 +600,13 @@ lzma_lzma_encoder_reset(lzma_lzma1_encoder *coder, extern lzma_ret -lzma_lzma_encoder_create(void **coder_ptr, - const lzma_allocator *allocator, - const lzma_options_lzma *options, lzma_lz_options *lz_options) +lzma_lzma_encoder_create(void **coder_ptr, const lzma_allocator *allocator, + lzma_vli id, const lzma_options_lzma *options, + lzma_lz_options *lz_options) { + assert(id == LZMA_FILTER_LZMA1 || id == LZMA_FILTER_LZMA1EXT + || id == LZMA_FILTER_LZMA2); + // Allocate lzma_lzma1_encoder if it wasn't already allocated. if (*coder_ptr == NULL) { *coder_ptr = lzma_alloc(sizeof(lzma_lzma1_encoder), allocator); @@ -672,6 +676,32 @@ lzma_lzma_encoder_create(void **coder_ptr, // Output size limitting is disabled by default. coder->out_limit = 0; + // Determine if end marker is wanted: + // - It is never used with LZMA2. + // - It is always used with LZMA_FILTER_LZMA1 (unless + // lzma_lzma_set_out_limit() is called later). + // - LZMA_FILTER_LZMA1EXT has a flag for it in the options. + coder->use_eopm = (id == LZMA_FILTER_LZMA1); + if (id == LZMA_FILTER_LZMA1EXT) { + // Check if unsupported flags are present. + if (options->ext_flags & ~LZMA_LZMA1EXT_ALLOW_EOPM) + return LZMA_OPTIONS_ERROR; + + coder->use_eopm = (options->ext_flags + & LZMA_LZMA1EXT_ALLOW_EOPM) != 0; + + // TODO? As long as there are no filters that change the size + // of the data, it is enough to look at lzma_stream.total_in + // after encoding has been finished to know the uncompressed + // size of the LZMA1 stream. But in the future there could be + // filters that change the size of the data and then total_in + // doesn't work as the LZMA1 stream size might be different + // due to another filter in the chain. The problem is simple + // to solve: Add another flag to ext_flags and then set + // coder->uncomp_size_ptr to the address stored in + // lzma_options_lzma.reserved_ptr2 (or _ptr1). + } + set_lz_options(lz_options, options); return lzma_lzma_encoder_reset(coder, options); @@ -685,7 +715,7 @@ lzma_encoder_init(lzma_lz_encoder *lz, const lzma_allocator *allocator, lz->code = &lzma_encode; lz->set_out_limit = &lzma_lzma_set_out_limit; return lzma_lzma_encoder_create( - &lz->coder, allocator, options, lz_options); + &lz->coder, allocator, id, options, lz_options); } diff --git a/src/liblzma/lzma/lzma_encoder.h b/src/liblzma/lzma/lzma_encoder.h index 6cfdf228..84d8c916 100644 --- a/src/liblzma/lzma/lzma_encoder.h +++ b/src/liblzma/lzma/lzma_encoder.h @@ -40,7 +40,8 @@ extern bool lzma_lzma_lclppb_encode( /// Initializes raw LZMA encoder; this is used by LZMA2. extern lzma_ret lzma_lzma_encoder_create( void **coder_ptr, const lzma_allocator *allocator, - const lzma_options_lzma *options, lzma_lz_options *lz_options); + lzma_vli id, const lzma_options_lzma *options, + lzma_lz_options *lz_options); /// Resets an already initialized LZMA encoder; this is used by LZMA2. diff --git a/src/liblzma/lzma/lzma_encoder_private.h b/src/liblzma/lzma/lzma_encoder_private.h index 8960c52c..b228c577 100644 --- a/src/liblzma/lzma/lzma_encoder_private.h +++ b/src/liblzma/lzma/lzma_encoder_private.h @@ -111,6 +111,9 @@ struct lzma_lzma1_encoder_s { /// have been written to the output buffer yet. bool is_flushed; + /// True if end of payload marker will be written. + bool use_eopm; + uint32_t pos_mask; ///< (1 << pos_bits) - 1 uint32_t literal_context_bits; uint32_t literal_pos_mask; |