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Diffstat (limited to '')
| -rw-r--r-- | src/liblzma/subblock/subblock_encoder.c | 984 |
1 files changed, 0 insertions, 984 deletions
diff --git a/src/liblzma/subblock/subblock_encoder.c b/src/liblzma/subblock/subblock_encoder.c deleted file mode 100644 index 4f71f99c..00000000 --- a/src/liblzma/subblock/subblock_encoder.c +++ /dev/null @@ -1,984 +0,0 @@ -/////////////////////////////////////////////////////////////////////////////// -// -/// \file subblock_encoder.c -/// \brief Encoder of the Subblock filter -// -// Author: Lasse Collin -// -// This file has been put into the public domain. -// You can do whatever you want with this file. -// -/////////////////////////////////////////////////////////////////////////////// - -#include "subblock_encoder.h" -#include "filter_encoder.h" - - -/// Maximum number of repeats that a single Repeating Data can indicate. -/// This is directly from the file format specification. -#define REPEAT_COUNT_MAX (1U << 28) - -/// Number of bytes the data chunk (not including the header part) must be -/// before we care about alignment. This is somewhat arbitrary. It just -/// doesn't make sense to waste bytes for alignment when the data chunk -/// is very small. -#define MIN_CHUNK_SIZE_FOR_ALIGN 4 - -/// Number of bytes of the header part of Subblock Type `Data'. This is -/// used as the `skew' argument for subblock_align(). -#define ALIGN_SKEW_DATA 4 - -/// Like above but for Repeating Data. -#define ALIGN_SKEW_REPEATING_DATA 5 - -/// Writes one byte to output buffer and updates the alignment counter. -#define write_byte(b) \ -do { \ - assert(*out_pos < out_size); \ - out[*out_pos] = b; \ - ++*out_pos; \ - ++coder->alignment.out_pos; \ -} while (0) - - -struct lzma_coder_s { - lzma_next_coder next; - bool next_finished; - - enum { - SEQ_FILL, - SEQ_FLUSH, - SEQ_RLE_COUNT_0, - SEQ_RLE_COUNT_1, - SEQ_RLE_COUNT_2, - SEQ_RLE_COUNT_3, - SEQ_RLE_SIZE, - SEQ_RLE_DATA, - SEQ_DATA_SIZE_0, - SEQ_DATA_SIZE_1, - SEQ_DATA_SIZE_2, - SEQ_DATA_SIZE_3, - SEQ_DATA, - SEQ_SUBFILTER_INIT, - SEQ_SUBFILTER_FLAGS, - } sequence; - - /// Pointer to the options given by the application. This is used - /// for two-way communication with the application. - lzma_options_subblock *options; - - /// Position in various arrays. - size_t pos; - - /// Holds subblock.size - 1 or rle.size - 1 when encoding size - /// of Data or Repeat Count. - uint32_t tmp; - - struct { - /// This is a copy of options->alignment, or - /// LZMA_SUBBLOCK_ALIGNMENT_DEFAULT if options is NULL. - uint32_t multiple; - - /// Number of input bytes which we have processed and started - /// writing out. 32-bit integer is enough since we care only - /// about the lowest bits when fixing alignment. - uint32_t in_pos; - - /// Number of bytes written out. - uint32_t out_pos; - } alignment; - - struct { - /// Pointer to allocated buffer holding the Data field - /// of Subblock Type "Data". - uint8_t *data; - - /// Number of bytes in the buffer. - size_t size; - - /// Allocated size of the buffer. - size_t limit; - - /// Number of input bytes that we have already read but - /// not yet started writing out. This can be different - /// to `size' when using Subfilter. That's why we track - /// in_pending separately for RLE (see below). - uint32_t in_pending; - } subblock; - - struct { - /// Buffer to hold the data that may be coded with - /// Subblock Type `Repeating Data'. - uint8_t buffer[LZMA_SUBBLOCK_RLE_MAX]; - - /// Number of bytes in buffer[]. - size_t size; - - /// Number of times the first `size' bytes of buffer[] - /// will be repeated. - uint64_t count; - - /// Like subblock.in_pending above, but for RLE. - uint32_t in_pending; - } rle; - - struct { - enum { - SUB_NONE, - SUB_SET, - SUB_RUN, - SUB_FLUSH, - SUB_FINISH, - SUB_END_MARKER, - } mode; - - /// This is a copy of options->allow_subfilters. We use - /// this to verify that the application doesn't change - /// the value of allow_subfilters. - bool allow; - - /// When this is true, application is not allowed to modify - /// options->subblock_mode. We may still modify it here. - bool mode_locked; - - /// True if we have encoded at least one byte of data with - /// the Subfilter. - bool got_input; - - /// Track the amount of input available once - /// LZMA_SUBFILTER_FINISH has been enabled. - /// This is needed for sanity checking (kind - /// of duplicating what common/code.c does). - size_t in_avail; - - /// Buffer for the Filter Flags field written after - /// the `Set Subfilter' indicator. - uint8_t *flags; - - /// Size of Filter Flags field. - uint32_t flags_size; - - /// Pointers to Subfilter. - lzma_next_coder subcoder; - - } subfilter; - - /// Temporary buffer used when we are not the last filter in the chain. - struct { - size_t pos; - size_t size; - uint8_t buffer[LZMA_BUFFER_SIZE]; - } temp; -}; - - -/// \brief Aligns the output buffer -/// -/// Aligns the output buffer so that after skew bytes the output position is -/// a multiple of coder->alignment.multiple. -static bool -subblock_align(lzma_coder *coder, uint8_t *restrict out, - size_t *restrict out_pos, size_t out_size, - size_t chunk_size, uint32_t skew) -{ - assert(*out_pos < out_size); - - // Fix the alignment only if it makes sense at least a little. - if (chunk_size >= MIN_CHUNK_SIZE_FOR_ALIGN) { - const uint32_t target = coder->alignment.in_pos - % coder->alignment.multiple; - - while ((coder->alignment.out_pos + skew) - % coder->alignment.multiple != target) { - // Zero indicates padding. - write_byte(0x00); - - // Check if output buffer got full and indicate it to - // the caller. - if (*out_pos == out_size) - return true; - } - } - - // Output buffer is not full. - return false; -} - - -/// \brief Checks if buffer contains repeated data -/// -/// \param needle Buffer containing a single repeat chunk -/// \param needle_size Size of needle in bytes -/// \param buf Buffer to search for repeated needles -/// \param buf_chunks Buffer size is buf_chunks * needle_size. -/// -/// \return True if the whole buf is filled with repeated needles. -/// -static bool -is_repeating(const uint8_t *restrict needle, size_t needle_size, - const uint8_t *restrict buf, size_t buf_chunks) -{ - while (buf_chunks-- != 0) { - if (memcmp(buf, needle, needle_size) != 0) - return false; - - buf += needle_size; - } - - return true; -} - - -/// \brief Optimizes the repeating style and updates coder->sequence -static void -subblock_rle_flush(lzma_coder *coder) -{ - // The Subblock decoder can use memset() when the size of the data - // being repeated is one byte, so we check if the RLE buffer is - // filled with a single repeating byte. - if (coder->rle.size > 1) { - const uint8_t b = coder->rle.buffer[0]; - size_t i = 0; - while (true) { - if (coder->rle.buffer[i] != b) - break; - - if (++i == coder->rle.size) { - // TODO Integer overflow check maybe, - // although this needs at least 2**63 bytes - // of input until it gets triggered... - coder->rle.count *= coder->rle.size; - coder->rle.size = 1; - break; - } - } - } - - if (coder->rle.count == 1) { - // The buffer should be repeated only once. It is - // waste of space to use Repeating Data. Instead, - // write a regular Data Subblock. See SEQ_RLE_COUNT_0 - // in subblock_buffer() for more info. - coder->tmp = coder->rle.size - 1; - } else if (coder->rle.count > REPEAT_COUNT_MAX) { - // There's so much to repeat that it doesn't fit into - // 28-bit integer. We will write two or more Subblocks - // of type Repeating Data. - coder->tmp = REPEAT_COUNT_MAX - 1; - } else { - coder->tmp = coder->rle.count - 1; - } - - coder->sequence = SEQ_RLE_COUNT_0; - - return; -} - - -/// \brief Resizes coder->subblock.data for a new size limit -static lzma_ret -subblock_data_size(lzma_coder *coder, lzma_allocator *allocator, - size_t new_limit) -{ - // Verify that the new limit is valid. - if (new_limit < LZMA_SUBBLOCK_DATA_SIZE_MIN - || new_limit > LZMA_SUBBLOCK_DATA_SIZE_MAX) - return LZMA_OPTIONS_ERROR; - - // Ff the new limit is different than the previous one, we need - // to reallocate the data buffer. - if (new_limit != coder->subblock.limit) { - lzma_free(coder->subblock.data, allocator); - coder->subblock.data = lzma_alloc(new_limit, allocator); - if (coder->subblock.data == NULL) - return LZMA_MEM_ERROR; - } - - coder->subblock.limit = new_limit; - - return LZMA_OK; -} - - -static lzma_ret -subblock_buffer(lzma_coder *coder, 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) -{ - // Changing allow_subfilter is not allowed. - if (coder->options != NULL && coder->subfilter.allow - != coder->options->allow_subfilters) - return LZMA_PROG_ERROR; - - // Check if we need to do something special with the Subfilter. - if (coder->subfilter.allow) { - assert(coder->options != NULL); - - // See if subfilter_mode has been changed. - switch (coder->options->subfilter_mode) { - case LZMA_SUBFILTER_NONE: - if (coder->subfilter.mode != SUB_NONE) - return LZMA_PROG_ERROR; - break; - - case LZMA_SUBFILTER_SET: - if (coder->subfilter.mode_locked - || coder->subfilter.mode != SUB_NONE) - return LZMA_PROG_ERROR; - - coder->subfilter.mode = SUB_SET; - coder->subfilter.got_input = false; - - if (coder->sequence == SEQ_FILL) - coder->sequence = SEQ_FLUSH; - - break; - - case LZMA_SUBFILTER_RUN: - if (coder->subfilter.mode != SUB_RUN) - return LZMA_PROG_ERROR; - - break; - - case LZMA_SUBFILTER_FINISH: { - const size_t in_avail = in_size - *in_pos; - - if (coder->subfilter.mode == SUB_RUN) { - if (coder->subfilter.mode_locked) - return LZMA_PROG_ERROR; - - coder->subfilter.mode = SUB_FINISH; - coder->subfilter.in_avail = in_avail; - - } else if (coder->subfilter.mode != SUB_FINISH - || coder->subfilter.in_avail - != in_avail) { - return LZMA_PROG_ERROR; - } - - break; - } - - default: - return LZMA_OPTIONS_ERROR; - } - - // If we are sync-flushing or finishing, the application may - // no longer change subfilter_mode. Note that this check is - // done after checking the new subfilter_mode above; this - // way the application may e.g. set LZMA_SUBFILTER_SET and - // LZMA_SYNC_FLUSH at the same time, but it cannot modify - // subfilter_mode on the later lzma_code() calls before - // we have returned LZMA_STREAM_END. - if (action != LZMA_RUN) - coder->subfilter.mode_locked = true; - } - - // Main loop - while (*out_pos < out_size) - switch (coder->sequence) { - case SEQ_FILL: - // Grab the new Subblock Data Size and reallocate the buffer. - if (coder->subblock.size == 0 && coder->options != NULL - && coder->options->subblock_data_size - != coder->subblock.limit) - return_if_error(subblock_data_size(coder, - allocator, coder->options - ->subblock_data_size)); - - if (coder->subfilter.mode == SUB_NONE) { - assert(coder->subfilter.subcoder.code == NULL); - - // No Subfilter is enabled, just copy the data as is. - coder->subblock.in_pending += lzma_bufcpy( - in, in_pos, in_size, - coder->subblock.data, - &coder->subblock.size, - coder->subblock.limit); - - // If we ran out of input before the whole buffer - // was filled, return to application. - if (coder->subblock.size < coder->subblock.limit - && action == LZMA_RUN) - return LZMA_OK; - - } else { - assert(coder->options->subfilter_mode - != LZMA_SUBFILTER_SET); - - // Using LZMA_FINISH automatically toggles - // LZMA_SUBFILTER_FINISH. - // - // NOTE: It is possible that application had set - // LZMA_SUBFILTER_SET and LZMA_FINISH at the same - // time. In that case it is possible that we will - // cycle to LZMA_SUBFILTER_RUN, LZMA_SUBFILTER_FINISH, - // and back to LZMA_SUBFILTER_NONE in a single - // Subblock encoder function call. - if (action == LZMA_FINISH) { - coder->options->subfilter_mode - = LZMA_SUBFILTER_FINISH; - coder->subfilter.mode = SUB_FINISH; - } - - const size_t in_start = *in_pos; - - const lzma_ret ret = coder->subfilter.subcoder.code( - coder->subfilter.subcoder.coder, - allocator, in, in_pos, in_size, - coder->subblock.data, - &coder->subblock.size, - coder->subblock.limit, - coder->subfilter.mode == SUB_FINISH - ? LZMA_FINISH : action); - - const size_t in_used = *in_pos - in_start; - coder->subblock.in_pending += in_used; - if (in_used > 0) - coder->subfilter.got_input = true; - - coder->subfilter.in_avail = in_size - *in_pos; - - if (ret == LZMA_STREAM_END) { - // All currently available input must have - // been processed. - assert(*in_pos == in_size); - - // Flush now. Even if coder->subblock.size - // happened to be zero, we still need to go - // to SEQ_FLUSH to possibly finish RLE or - // write the Subfilter Unset indicator. - coder->sequence = SEQ_FLUSH; - - if (coder->subfilter.mode == SUB_RUN) { - // Flushing with Subfilter enabled. - assert(action == LZMA_SYNC_FLUSH); - coder->subfilter.mode = SUB_FLUSH; - break; - } - - // Subfilter finished its job. - assert(coder->subfilter.mode == SUB_FINISH - || action == LZMA_FINISH); - - // At least one byte of input must have been - // encoded with the Subfilter. This is - // required by the file format specification. - if (!coder->subfilter.got_input) - return LZMA_PROG_ERROR; - - // We don't strictly need to do this, but - // doing it sounds like a good idea, because - // otherwise the Subfilter's memory could be - // left allocated for long time, and would - // just waste memory. - lzma_next_end(&coder->subfilter.subcoder, - allocator); - - // We need to flush the currently buffered - // data and write Unset Subfilter marker. - // Note that we cannot set - // coder->options->subfilter_mode to - // LZMA_SUBFILTER_NONE yet, because we - // haven't written the Unset Subfilter - // marker yet. - coder->subfilter.mode = SUB_END_MARKER; - coder->sequence = SEQ_FLUSH; - break; - } - - // Return if we couldn't fill the buffer or - // if an error occurred. - if (coder->subblock.size < coder->subblock.limit - || ret != LZMA_OK) - return ret; - } - - coder->sequence = SEQ_FLUSH; - - // SEQ_FILL doesn't produce any output so falling through - // to SEQ_FLUSH is safe. - assert(*out_pos < out_size); - - // Fall through - - case SEQ_FLUSH: - if (coder->options != NULL) { - // Update the alignment variable. - coder->alignment.multiple = coder->options->alignment; - if (coder->alignment.multiple - < LZMA_SUBBLOCK_ALIGNMENT_MIN - || coder->alignment.multiple - > LZMA_SUBBLOCK_ALIGNMENT_MAX) - return LZMA_OPTIONS_ERROR; - - // Run-length encoder - // - // First check if there is some data pending and we - // have an obvious need to flush it immediately. - if (coder->rle.count > 0 - && (coder->rle.size - != coder->options->rle - || coder->subblock.size - % coder->rle.size)) { - subblock_rle_flush(coder); - break; - } - - // Grab the (possibly new) RLE chunk size and - // validate it. - coder->rle.size = coder->options->rle; - if (coder->rle.size > LZMA_SUBBLOCK_RLE_MAX) - return LZMA_OPTIONS_ERROR; - - if (coder->subblock.size != 0 - && coder->rle.size - != LZMA_SUBBLOCK_RLE_OFF - && coder->subblock.size - % coder->rle.size == 0) { - - // Initialize coder->rle.buffer if we don't - // have RLE already running. - if (coder->rle.count == 0) - memcpy(coder->rle.buffer, - coder->subblock.data, - coder->rle.size); - - // Test if coder->subblock.data is repeating. - // If coder->rle.count would overflow, we - // force flushing. Forced flushing shouldn't - // really happen in real-world situations. - const size_t count = coder->subblock.size - / coder->rle.size; - if (UINT64_MAX - count > coder->rle.count - && is_repeating( - coder->rle.buffer, - coder->rle.size, - coder->subblock.data, - count)) { - coder->rle.count += count; - coder->rle.in_pending += coder - ->subblock.in_pending; - coder->subblock.in_pending = 0; - coder->subblock.size = 0; - - } else if (coder->rle.count > 0) { - // It's not repeating or at least not - // with the same byte sequence as the - // earlier Subblock Data buffers. We - // have some data pending in the RLE - // buffer already, so do a flush. - // Once flushed, we will check again - // if the Subblock Data happens to - // contain a different repeating - // sequence. - subblock_rle_flush(coder); - break; - } - } - } - - // If we now have some data left in coder->subblock, the RLE - // buffer is empty and we must write a regular Subblock Data. - if (coder->subblock.size > 0) { - assert(coder->rle.count == 0); - coder->tmp = coder->subblock.size - 1; - coder->sequence = SEQ_DATA_SIZE_0; - break; - } - - // Check if we should enable Subfilter. - if (coder->subfilter.mode == SUB_SET) { - if (coder->rle.count > 0) - subblock_rle_flush(coder); - else - coder->sequence = SEQ_SUBFILTER_INIT; - break; - } - - // Check if we have just finished Subfiltering. - if (coder->subfilter.mode == SUB_END_MARKER) { - if (coder->rle.count > 0) { - subblock_rle_flush(coder); - break; - } - - coder->options->subfilter_mode = LZMA_SUBFILTER_NONE; - coder->subfilter.mode = SUB_NONE; - - write_byte(0x50); - if (*out_pos == out_size) - return LZMA_OK; - } - - // Check if we have already written everything. - if (action != LZMA_RUN && *in_pos == in_size - && (coder->subfilter.mode == SUB_NONE - || coder->subfilter.mode == SUB_FLUSH)) { - if (coder->rle.count > 0) { - subblock_rle_flush(coder); - break; - } - - if (action == LZMA_SYNC_FLUSH) { - if (coder->subfilter.mode == SUB_FLUSH) - coder->subfilter.mode = SUB_RUN; - - coder->subfilter.mode_locked = false; - coder->sequence = SEQ_FILL; - - } else { - assert(action == LZMA_FINISH); - - // Write EOPM. - // NOTE: No need to use write_byte() here - // since we are finishing. - out[*out_pos] = 0x10; - ++*out_pos; - } - - return LZMA_STREAM_END; - } - - // Otherwise we have more work to do. - coder->sequence = SEQ_FILL; - break; - - case SEQ_RLE_COUNT_0: - assert(coder->rle.count > 0); - - if (coder->rle.count == 1) { - // The buffer should be repeated only once. Fix - // the alignment and write the first byte of - // Subblock Type `Data'. - if (subblock_align(coder, out, out_pos, out_size, - coder->rle.size, ALIGN_SKEW_DATA)) - return LZMA_OK; - - write_byte(0x20 | (coder->tmp & 0x0F)); - - } else { - // We have something to actually repeat, which should - // mean that it takes less space with run-length - // encoding. - if (subblock_align(coder, out, out_pos, out_size, - coder->rle.size, - ALIGN_SKEW_REPEATING_DATA)) - return LZMA_OK; - - write_byte(0x30 | (coder->tmp & 0x0F)); - } - - // NOTE: If we have to write more than one Repeating Data - // due to rle.count > REPEAT_COUNT_MAX, the subsequent - // Repeating Data Subblocks may get wrong alignment, because - // we add rle.in_pending to alignment.in_pos at once instead - // of adding only as much as this particular Repeating Data - // consumed input data. Correct alignment is always restored - // after all the required Repeating Data Subblocks have been - // written. This problem occurs in such a weird cases that - // it's not worth fixing. - coder->alignment.out_pos += coder->rle.size; - coder->alignment.in_pos += coder->rle.in_pending; - coder->rle.in_pending = 0; - - coder->sequence = SEQ_RLE_COUNT_1; - break; - - case SEQ_RLE_COUNT_1: - write_byte(coder->tmp >> 4); - coder->sequence = SEQ_RLE_COUNT_2; - break; - - case SEQ_RLE_COUNT_2: - write_byte(coder->tmp >> 12); - coder->sequence = SEQ_RLE_COUNT_3; - break; - - case SEQ_RLE_COUNT_3: - write_byte(coder->tmp >> 20); - - // Again, see if we are writing regular Data or Repeating Data. - // In the former case, we skip SEQ_RLE_SIZE. - if (coder->rle.count == 1) - coder->sequence = SEQ_RLE_DATA; - else - coder->sequence = SEQ_RLE_SIZE; - - if (coder->rle.count > REPEAT_COUNT_MAX) - coder->rle.count -= REPEAT_COUNT_MAX; - else - coder->rle.count = 0; - - break; - - case SEQ_RLE_SIZE: - assert(coder->rle.size >= LZMA_SUBBLOCK_RLE_MIN); - assert(coder->rle.size <= LZMA_SUBBLOCK_RLE_MAX); - write_byte(coder->rle.size - 1); - coder->sequence = SEQ_RLE_DATA; - break; - - case SEQ_RLE_DATA: - lzma_bufcpy(coder->rle.buffer, &coder->pos, coder->rle.size, - out, out_pos, out_size); - if (coder->pos < coder->rle.size) - return LZMA_OK; - - coder->pos = 0; - coder->sequence = SEQ_FLUSH; - break; - - case SEQ_DATA_SIZE_0: - // We need four bytes for the Size field. - if (subblock_align(coder, out, out_pos, out_size, - coder->subblock.size, ALIGN_SKEW_DATA)) - return LZMA_OK; - - coder->alignment.out_pos += coder->subblock.size; - coder->alignment.in_pos += coder->subblock.in_pending; - coder->subblock.in_pending = 0; - - write_byte(0x20 | (coder->tmp & 0x0F)); - coder->sequence = SEQ_DATA_SIZE_1; - break; - - case SEQ_DATA_SIZE_1: - write_byte(coder->tmp >> 4); - coder->sequence = SEQ_DATA_SIZE_2; - break; - - case SEQ_DATA_SIZE_2: - write_byte(coder->tmp >> 12); - coder->sequence = SEQ_DATA_SIZE_3; - break; - - case SEQ_DATA_SIZE_3: - write_byte(coder->tmp >> 20); - coder->sequence = SEQ_DATA; - break; - - case SEQ_DATA: - lzma_bufcpy(coder->subblock.data, &coder->pos, - coder->subblock.size, out, out_pos, out_size); - if (coder->pos < coder->subblock.size) - return LZMA_OK; - - coder->subblock.size = 0; - coder->pos = 0; - coder->sequence = SEQ_FLUSH; - break; - - case SEQ_SUBFILTER_INIT: { - assert(coder->subblock.size == 0); - assert(coder->subblock.in_pending == 0); - assert(coder->rle.count == 0); - assert(coder->rle.in_pending == 0); - assert(coder->subfilter.mode == SUB_SET); - assert(coder->options != NULL); - - // There must be a filter specified. - if (coder->options->subfilter_options.id == LZMA_VLI_UNKNOWN) - return LZMA_OPTIONS_ERROR; - - // Initialize a raw encoder to work as a Subfilter. - lzma_filter options[2]; - options[0] = coder->options->subfilter_options; - options[1].id = LZMA_VLI_UNKNOWN; - - return_if_error(lzma_raw_encoder_init( - &coder->subfilter.subcoder, allocator, - options)); - - // Encode the Filter Flags field into a buffer. This should - // never fail since we have already successfully initialized - // the Subfilter itself. Check it still, and return - // LZMA_PROG_ERROR instead of whatever the ret would say. - lzma_ret ret = lzma_filter_flags_size( - &coder->subfilter.flags_size, options); - assert(ret == LZMA_OK); - if (ret != LZMA_OK) - return LZMA_PROG_ERROR; - - coder->subfilter.flags = lzma_alloc( - coder->subfilter.flags_size, allocator); - if (coder->subfilter.flags == NULL) - return LZMA_MEM_ERROR; - - // Now we have a big-enough buffer. Encode the Filter Flags. - // Like above, this should never fail. - size_t dummy = 0; - ret = lzma_filter_flags_encode(options, coder->subfilter.flags, - &dummy, coder->subfilter.flags_size); - assert(ret == LZMA_OK); - assert(dummy == coder->subfilter.flags_size); - if (ret != LZMA_OK || dummy != coder->subfilter.flags_size) - return LZMA_PROG_ERROR; - - // Write a Subblock indicating a new Subfilter. - write_byte(0x40); - - coder->options->subfilter_mode = LZMA_SUBFILTER_RUN; - coder->subfilter.mode = SUB_RUN; - coder->alignment.out_pos += coder->subfilter.flags_size; - coder->sequence = SEQ_SUBFILTER_FLAGS; - - // It is safe to fall through because SEQ_SUBFILTER_FLAGS - // uses lzma_bufcpy() which doesn't write unless there is - // output space. - } - - // Fall through - - case SEQ_SUBFILTER_FLAGS: - // Copy the Filter Flags to the output stream. - lzma_bufcpy(coder->subfilter.flags, &coder->pos, - coder->subfilter.flags_size, - out, out_pos, out_size); - if (coder->pos < coder->subfilter.flags_size) - return LZMA_OK; - - lzma_free(coder->subfilter.flags, allocator); - coder->subfilter.flags = NULL; - - coder->pos = 0; - coder->sequence = SEQ_FILL; - break; - - default: - return LZMA_PROG_ERROR; - } - - return LZMA_OK; -} - - -static lzma_ret -subblock_encode(lzma_coder *coder, 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) -{ - if (coder->next.code == NULL) - return subblock_buffer(coder, allocator, in, in_pos, in_size, - out, out_pos, out_size, action); - - while (*out_pos < out_size - && (*in_pos < in_size || action != LZMA_RUN)) { - if (!coder->next_finished - && coder->temp.pos == coder->temp.size) { - coder->temp.pos = 0; - coder->temp.size = 0; - - const lzma_ret ret = coder->next.code(coder->next.coder, - allocator, in, in_pos, in_size, - coder->temp.buffer, &coder->temp.size, - LZMA_BUFFER_SIZE, action); - if (ret == LZMA_STREAM_END) { - assert(action != LZMA_RUN); - coder->next_finished = true; - } else if (coder->temp.size == 0 || ret != LZMA_OK) { - return ret; - } - } - - const lzma_ret ret = subblock_buffer(coder, allocator, - coder->temp.buffer, &coder->temp.pos, - coder->temp.size, out, out_pos, out_size, - coder->next_finished ? LZMA_FINISH : LZMA_RUN); - if (ret == LZMA_STREAM_END) { - assert(action != LZMA_RUN); - assert(coder->next_finished); - return LZMA_STREAM_END; - } - - if (ret != LZMA_OK) - return ret; - } - - return LZMA_OK; -} - - -static void -subblock_encoder_end(lzma_coder *coder, lzma_allocator *allocator) -{ - lzma_next_end(&coder->next, allocator); - lzma_next_end(&coder->subfilter.subcoder, allocator); - lzma_free(coder->subblock.data, allocator); - lzma_free(coder->subfilter.flags, allocator); - lzma_free(coder, allocator); - return; -} - - -extern lzma_ret -lzma_subblock_encoder_init(lzma_next_coder *next, lzma_allocator *allocator, - const lzma_filter_info *filters) -{ - if (next->coder == NULL) { - next->coder = lzma_alloc(sizeof(lzma_coder), allocator); - if (next->coder == NULL) - return LZMA_MEM_ERROR; - - next->code = &subblock_encode; - next->end = &subblock_encoder_end; - - next->coder->next = LZMA_NEXT_CODER_INIT; - next->coder->subblock.data = NULL; - next->coder->subblock.limit = 0; - next->coder->subfilter.subcoder = LZMA_NEXT_CODER_INIT; - } else { - lzma_next_end(&next->coder->subfilter.subcoder, - allocator); - lzma_free(next->coder->subfilter.flags, allocator); - } - - next->coder->subfilter.flags = NULL; - - next->coder->next_finished = false; - next->coder->sequence = SEQ_FILL; - next->coder->options = filters[0].options; - next->coder->pos = 0; - - next->coder->alignment.in_pos = 0; - next->coder->alignment.out_pos = 0; - next->coder->subblock.size = 0; - next->coder->subblock.in_pending = 0; - next->coder->rle.count = 0; - next->coder->rle.in_pending = 0; - next->coder->subfilter.mode = SUB_NONE; - next->coder->subfilter.mode_locked = false; - - next->coder->temp.pos = 0; - next->coder->temp.size = 0; - - // Grab some values from the options structure if it is available. - size_t subblock_size_limit; - if (next->coder->options != NULL) { - if (next->coder->options->alignment - < LZMA_SUBBLOCK_ALIGNMENT_MIN - || next->coder->options->alignment - > LZMA_SUBBLOCK_ALIGNMENT_MAX) { - subblock_encoder_end(next->coder, allocator); - return LZMA_OPTIONS_ERROR; - } - next->coder->alignment.multiple - = next->coder->options->alignment; - next->coder->subfilter.allow - = next->coder->options->allow_subfilters; - subblock_size_limit = next->coder->options->subblock_data_size; - } else { - next->coder->alignment.multiple - = LZMA_SUBBLOCK_ALIGNMENT_DEFAULT; - next->coder->subfilter.allow = false; - subblock_size_limit = LZMA_SUBBLOCK_DATA_SIZE_DEFAULT; - } - - return_if_error(subblock_data_size(next->coder, allocator, - subblock_size_limit)); - - return lzma_next_filter_init( - &next->coder->next, allocator, filters + 1); -} |