11be35a165
To do so, a few dependencies have been imported: * external/bsd/lutok * external/mit/lua * external/public-domain/sqlite * external/public-domain/xz The Kyua framework is the new generation of ATF (Automated Test Framework), it is composed of: * external/bsd/atf * external/bsd/kyua-atf-compat * external/bsd/kyua-cli * external/bsd/kyua-tester * tests Kyua/ATF being written in C++, it depends on libstdc++ which is provided by GCC. As this is not part of the sources, Kyua is only compiled when the native GCC utils are installed. To install Kyua do the following: * In a cross-build enviromnent, add the following to the build.sh commandline: -V MKBINUTILS=yes -V MKGCCCMDS=yes WARNING: At this point the import is still experimental, and not supported on native builds (a.k.a make build). Change-Id: I26aee23c5bbd2d64adcb7c1beb98fe0d479d7ada
122 lines
3.3 KiB
C
122 lines
3.3 KiB
C
///////////////////////////////////////////////////////////////////////////////
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//
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/// \file delta_encoder.c
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/// \brief Delta filter encoder
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//
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// Author: Lasse Collin
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//
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// This file has been put into the public domain.
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// You can do whatever you want with this file.
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//
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///////////////////////////////////////////////////////////////////////////////
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#include "delta_encoder.h"
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#include "delta_private.h"
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/// Copies and encodes the data at the same time. This is used when Delta
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/// is the first filter in the chain (and thus the last filter in the
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/// encoder's filter stack).
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static void
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copy_and_encode(lzma_coder *coder,
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const uint8_t *restrict in, uint8_t *restrict out, size_t size)
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{
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const size_t distance = coder->distance;
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for (size_t i = 0; i < size; ++i) {
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const uint8_t tmp = coder->history[
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(distance + coder->pos) & 0xFF];
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coder->history[coder->pos-- & 0xFF] = in[i];
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out[i] = in[i] - tmp;
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}
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}
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/// Encodes the data in place. This is used when we are the last filter
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/// in the chain (and thus non-last filter in the encoder's filter stack).
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static void
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encode_in_place(lzma_coder *coder, uint8_t *buffer, size_t size)
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{
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const size_t distance = coder->distance;
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for (size_t i = 0; i < size; ++i) {
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const uint8_t tmp = coder->history[
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(distance + coder->pos) & 0xFF];
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coder->history[coder->pos-- & 0xFF] = buffer[i];
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buffer[i] -= tmp;
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}
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}
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static lzma_ret
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delta_encode(lzma_coder *coder, lzma_allocator *allocator,
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const uint8_t *restrict in, size_t *restrict in_pos,
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size_t in_size, uint8_t *restrict out,
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size_t *restrict out_pos, size_t out_size, lzma_action action)
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{
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lzma_ret ret;
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if (coder->next.code == NULL) {
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const size_t in_avail = in_size - *in_pos;
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const size_t out_avail = out_size - *out_pos;
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const size_t size = my_min(in_avail, out_avail);
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copy_and_encode(coder, in + *in_pos, out + *out_pos, size);
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*in_pos += size;
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*out_pos += size;
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ret = action != LZMA_RUN && *in_pos == in_size
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? LZMA_STREAM_END : LZMA_OK;
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} else {
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const size_t out_start = *out_pos;
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ret = coder->next.code(coder->next.coder, allocator,
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in, in_pos, in_size, out, out_pos, out_size,
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action);
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encode_in_place(coder, out + out_start, *out_pos - out_start);
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}
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return ret;
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}
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static lzma_ret
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delta_encoder_update(lzma_coder *coder, lzma_allocator *allocator,
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const lzma_filter *filters_null lzma_attribute((__unused__)),
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const lzma_filter *reversed_filters)
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{
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// Delta doesn't and will never support changing the options in
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// the middle of encoding. If the app tries to change them, we
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// simply ignore them.
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return lzma_next_filter_update(
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&coder->next, allocator, reversed_filters + 1);
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}
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extern lzma_ret
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lzma_delta_encoder_init(lzma_next_coder *next, lzma_allocator *allocator,
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const lzma_filter_info *filters)
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{
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next->code = &delta_encode;
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next->update = &delta_encoder_update;
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return lzma_delta_coder_init(next, allocator, filters);
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}
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extern lzma_ret
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lzma_delta_props_encode(const void *options, uint8_t *out)
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{
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// The caller must have already validated the options, so it's
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// LZMA_PROG_ERROR if they are invalid.
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if (lzma_delta_coder_memusage(options) == UINT64_MAX)
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return LZMA_PROG_ERROR;
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const lzma_options_delta *opt = options;
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out[0] = opt->dist - LZMA_DELTA_DIST_MIN;
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return LZMA_OK;
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}
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