diff options
Diffstat (limited to 'Build/source/extra/xz/src/liblzma/delta/delta_encoder.c')
-rw-r--r-- | Build/source/extra/xz/src/liblzma/delta/delta_encoder.c | 121 |
1 files changed, 0 insertions, 121 deletions
diff --git a/Build/source/extra/xz/src/liblzma/delta/delta_encoder.c b/Build/source/extra/xz/src/liblzma/delta/delta_encoder.c deleted file mode 100644 index 15c7951e104..00000000000 --- a/Build/source/extra/xz/src/liblzma/delta/delta_encoder.c +++ /dev/null @@ -1,121 +0,0 @@ -/////////////////////////////////////////////////////////////////////////////// -// -/// \file delta_encoder.c -/// \brief Delta filter encoder -// -// Author: Lasse Collin -// -// This file has been put into the public domain. -// You can do whatever you want with this file. -// -/////////////////////////////////////////////////////////////////////////////// - -#include "delta_encoder.h" -#include "delta_private.h" - - -/// Copies and encodes the data at the same time. This is used when Delta -/// is the first filter in the chain (and thus the last filter in the -/// encoder's filter stack). -static void -copy_and_encode(lzma_coder *coder, - const uint8_t *restrict in, uint8_t *restrict out, size_t size) -{ - const size_t distance = coder->distance; - - for (size_t i = 0; i < size; ++i) { - const uint8_t tmp = coder->history[ - (distance + coder->pos) & 0xFF]; - coder->history[coder->pos-- & 0xFF] = in[i]; - out[i] = in[i] - tmp; - } -} - - -/// Encodes the data in place. This is used when we are the last filter -/// in the chain (and thus non-last filter in the encoder's filter stack). -static void -encode_in_place(lzma_coder *coder, uint8_t *buffer, size_t size) -{ - const size_t distance = coder->distance; - - for (size_t i = 0; i < size; ++i) { - const uint8_t tmp = coder->history[ - (distance + coder->pos) & 0xFF]; - coder->history[coder->pos-- & 0xFF] = buffer[i]; - buffer[i] -= tmp; - } -} - - -static lzma_ret -delta_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) -{ - lzma_ret ret; - - if (coder->next.code == NULL) { - const size_t in_avail = in_size - *in_pos; - const size_t out_avail = out_size - *out_pos; - const size_t size = my_min(in_avail, out_avail); - - copy_and_encode(coder, in + *in_pos, out + *out_pos, size); - - *in_pos += size; - *out_pos += size; - - ret = action != LZMA_RUN && *in_pos == in_size - ? LZMA_STREAM_END : LZMA_OK; - - } else { - const size_t out_start = *out_pos; - - ret = coder->next.code(coder->next.coder, allocator, - in, in_pos, in_size, out, out_pos, out_size, - action); - - encode_in_place(coder, out + out_start, *out_pos - out_start); - } - - return ret; -} - - -static lzma_ret -delta_encoder_update(lzma_coder *coder, lzma_allocator *allocator, - const lzma_filter *filters_null lzma_attribute((__unused__)), - const lzma_filter *reversed_filters) -{ - // Delta doesn't and will never support changing the options in - // the middle of encoding. If the app tries to change them, we - // simply ignore them. - return lzma_next_filter_update( - &coder->next, allocator, reversed_filters + 1); -} - - -extern lzma_ret -lzma_delta_encoder_init(lzma_next_coder *next, lzma_allocator *allocator, - const lzma_filter_info *filters) -{ - next->code = &delta_encode; - next->update = &delta_encoder_update; - return lzma_delta_coder_init(next, allocator, filters); -} - - -extern lzma_ret -lzma_delta_props_encode(const void *options, uint8_t *out) -{ - // The caller must have already validated the options, so it's - // LZMA_PROG_ERROR if they are invalid. - if (lzma_delta_coder_memusage(options) == UINT64_MAX) - return LZMA_PROG_ERROR; - - const lzma_options_delta *opt = options; - out[0] = opt->dist - LZMA_DELTA_DIST_MIN; - - return LZMA_OK; -} |