diff options
Diffstat (limited to '')
| -rw-r--r-- | src/liblzma/common/Makefile.am | 14 | ||||
| -rw-r--r-- | src/liblzma/common/delta_coder.c | 189 | ||||
| -rw-r--r-- | src/liblzma/common/delta_common.c | 70 | ||||
| -rw-r--r-- | src/liblzma/common/delta_common.h | 48 | ||||
| -rw-r--r-- | src/liblzma/common/delta_decoder.c | 102 | ||||
| -rw-r--r-- | src/liblzma/common/delta_decoder.h (renamed from src/liblzma/common/delta_coder.h) | 11 | ||||
| -rw-r--r-- | src/liblzma/common/delta_encoder.c | 97 | ||||
| -rw-r--r-- | src/liblzma/common/delta_encoder.h | 28 | ||||
| -rw-r--r-- | src/liblzma/common/raw_decoder.c | 2 | ||||
| -rw-r--r-- | src/liblzma/common/raw_encoder.c | 2 |
10 files changed, 363 insertions, 200 deletions
diff --git a/src/liblzma/common/Makefile.am b/src/liblzma/common/Makefile.am index a2eacfd8..048f4c73 100644 --- a/src/liblzma/common/Makefile.am +++ b/src/liblzma/common/Makefile.am @@ -48,8 +48,18 @@ endif if COND_FILTER_DELTA libcommon_la_SOURCES += \ - delta_coder.c \ - delta_coder.h + delta_common.c \ + delta_common.h +if COND_MAIN_ENCODER +libcommon_la_SOURCES += \ + delta_encoder.c \ + delta_encoder.h +endif +if COND_MAIN_DECODER +libcommon_la_SOURCES += \ + delta_decoder.c \ + delta_decoder.h +endif endif if COND_MAIN_ENCODER diff --git a/src/liblzma/common/delta_coder.c b/src/liblzma/common/delta_coder.c deleted file mode 100644 index 9b260a01..00000000 --- a/src/liblzma/common/delta_coder.c +++ /dev/null @@ -1,189 +0,0 @@ -/////////////////////////////////////////////////////////////////////////////// -// -/// \file delta_coder.c -/// \brief Encoder and decoder for the Delta filter -// -// Copyright (C) 2007 Lasse Collin -// -// This library is free software; you can redistribute it and/or -// modify it under the terms of the GNU Lesser General Public -// License as published by the Free Software Foundation; either -// version 2.1 of the License, or (at your option) any later version. -// -// This library is distributed in the hope that it will be useful, -// but WITHOUT ANY WARRANTY; without even the implied warranty of -// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -// Lesser General Public License for more details. -// -/////////////////////////////////////////////////////////////////////////////// - -#include "delta_coder.h" - - -struct lzma_coder_s { - /// Next coder in the chain - lzma_next_coder next; - - /// Uncompressed size - This is needed when we are the last - /// filter in the chain. - lzma_vli uncompressed_size; - - /// Delta distance - size_t distance; - - /// True if we are encoding; false if decoding - bool is_encoder; - - /// Position in history[] - uint8_t pos; - - /// Buffer to hold history of the original data - uint8_t history[LZMA_DELTA_DISTANCE_MAX]; -}; - - -static void -encode_buffer(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--] = buffer[i]; - buffer[i] -= tmp; - } - - return; -} - - -static void -decode_buffer(lzma_coder *coder, uint8_t *buffer, size_t size) -{ - const size_t distance = coder->distance; - - for (size_t i = 0; i < size; ++i) { - buffer[i] += coder->history[(distance + coder->pos) & 0xFF]; - coder->history[coder->pos--] = buffer[i]; - } - - return; -} - - -static lzma_ret -delta_code(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) -{ - const size_t out_start = *out_pos; - size_t size; - lzma_ret ret; - - if (coder->next.code == NULL) { - if (!coder->is_encoder) { - // Limit in_size so that we don't copy too much. - if ((lzma_vli)(in_size - *in_pos) - > coder->uncompressed_size) - in_size = *in_pos + (size_t)( - coder->uncompressed_size); - } - - size = bufcpy(in, in_pos, in_size, out, out_pos, out_size); - - if (coder->uncompressed_size != LZMA_VLI_VALUE_UNKNOWN) - coder->uncompressed_size -= size; - - // action can be LZMA_FINISH only in the encoder. - ret = (action == LZMA_FINISH && *in_pos == in_size) - || coder->uncompressed_size == 0 - ? LZMA_STREAM_END : LZMA_OK; - - } else { - ret = coder->next.code(coder->next.coder, allocator, - in, in_pos, in_size, out, out_pos, out_size, - action); - if (ret != LZMA_OK && ret != LZMA_STREAM_END) - return ret; - - size = *out_pos - out_start; - } - - if (coder->is_encoder) - encode_buffer(coder, out + out_start, size); - else - decode_buffer(coder, out + out_start, size); - - return ret; -} - - -static void -delta_coder_end(lzma_coder *coder, lzma_allocator *allocator) -{ - lzma_next_coder_end(&coder->next, allocator); - lzma_free(coder, allocator); - return; -} - - -static lzma_ret -delta_coder_init(lzma_next_coder *next, lzma_allocator *allocator, - const lzma_filter_info *filters, bool is_encoder) -{ - // Allocate memory for the decoder if needed. - if (next->coder == NULL) { - next->coder = lzma_alloc(sizeof(lzma_coder), allocator); - if (next->coder == NULL) - return LZMA_MEM_ERROR; - - next->code = &delta_code; - next->end = &delta_coder_end; - next->coder->next = LZMA_NEXT_CODER_INIT; - } - - // Copy Uncompressed Size which is used to limit the output size. - next->coder->uncompressed_size = filters[0].uncompressed_size; - - // The coder acts slightly differently as encoder and decoder. - next->coder->is_encoder = is_encoder; - - // Set the delta distance. - if (filters[0].options == NULL) - return LZMA_PROG_ERROR; - next->coder->distance = ((lzma_options_delta *)(filters[0].options)) - ->distance; - if (next->coder->distance < LZMA_DELTA_DISTANCE_MIN - || next->coder->distance > LZMA_DELTA_DISTANCE_MAX) - return LZMA_HEADER_ERROR; - - // Initialize the rest of the variables. - next->coder->pos = 0; - memzero(next->coder->history, LZMA_DELTA_DISTANCE_MAX); - - // Initialize the next decoder in the chain, if any. - return lzma_next_filter_init(&next->coder->next, - allocator, filters + 1); -} - - -#ifdef HAVE_ENCODER -extern lzma_ret -lzma_delta_encoder_init(lzma_next_coder *next, lzma_allocator *allocator, - const lzma_filter_info *filters) -{ - return delta_coder_init(next, allocator, filters, true); -} -#endif - - -#ifdef HAVE_DECODER -extern lzma_ret -lzma_delta_decoder_init(lzma_next_coder *next, lzma_allocator *allocator, - const lzma_filter_info *filters) -{ - return delta_coder_init(next, allocator, filters, false); -} -#endif diff --git a/src/liblzma/common/delta_common.c b/src/liblzma/common/delta_common.c new file mode 100644 index 00000000..de27b5a6 --- /dev/null +++ b/src/liblzma/common/delta_common.c @@ -0,0 +1,70 @@ +/////////////////////////////////////////////////////////////////////////////// +// +/// \file delta_common.c +/// \brief Common stuff for Delta encoder and decoder +// +// Copyright (C) 2007 Lasse Collin +// +// This library is free software; you can redistribute it and/or +// modify it under the terms of the GNU Lesser General Public +// License as published by the Free Software Foundation; either +// version 2.1 of the License, or (at your option) any later version. +// +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +// Lesser General Public License for more details. +// +/////////////////////////////////////////////////////////////////////////////// + +#include "delta_common.h" + + +static void +delta_coder_end(lzma_coder *coder, lzma_allocator *allocator) +{ + lzma_next_coder_end(&coder->next, allocator); + lzma_free(coder, allocator); + return; +} + + +extern lzma_ret +lzma_delta_coder_init(lzma_next_coder *next, lzma_allocator *allocator, + const lzma_filter_info *filters, lzma_code_function code) +{ + // Allocate memory for the decoder if needed. + if (next->coder == NULL) { + next->coder = lzma_alloc(sizeof(lzma_coder), allocator); + if (next->coder == NULL) + return LZMA_MEM_ERROR; + + // End function is the same for encoder and decoder. + next->end = &delta_coder_end; + next->coder->next = LZMA_NEXT_CODER_INIT; + } + + // Coding function is different for encoder and decoder. + next->code = code; + + // Copy Uncompressed Size which is used to limit the output size + // in the Delta decoder. + next->coder->uncompressed_size = filters[0].uncompressed_size; + + // Set the delta distance. + if (filters[0].options == NULL) + return LZMA_PROG_ERROR; + next->coder->distance = ((lzma_options_delta *)(filters[0].options)) + ->distance; + if (next->coder->distance < LZMA_DELTA_DISTANCE_MIN + || next->coder->distance > LZMA_DELTA_DISTANCE_MAX) + return LZMA_HEADER_ERROR; + + // Initialize the rest of the variables. + next->coder->pos = 0; + memzero(next->coder->history, LZMA_DELTA_DISTANCE_MAX); + + // Initialize the next decoder in the chain, if any. + return lzma_next_filter_init(&next->coder->next, + allocator, filters + 1); +} diff --git a/src/liblzma/common/delta_common.h b/src/liblzma/common/delta_common.h new file mode 100644 index 00000000..3ec955b7 --- /dev/null +++ b/src/liblzma/common/delta_common.h @@ -0,0 +1,48 @@ +/////////////////////////////////////////////////////////////////////////////// +// +/// \file delta_common.h +/// \brief Common stuff for Delta encoder and decoder +// +// Copyright (C) 2007 Lasse Collin +// +// This library is free software; you can redistribute it and/or +// modify it under the terms of the GNU Lesser General Public +// License as published by the Free Software Foundation; either +// version 2.1 of the License, or (at your option) any later version. +// +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +// Lesser General Public License for more details. +// +/////////////////////////////////////////////////////////////////////////////// + +#ifndef LZMA_DELTA_COMMON_H +#define LZMA_DELTA_COMMON_H + +#include "common.h" + +struct lzma_coder_s { + /// Next coder in the chain + lzma_next_coder next; + + /// Uncompressed size - This is needed when we are the last + /// filter in the chain. + lzma_vli uncompressed_size; + + /// Delta distance + size_t distance; + + /// Position in history[] + uint8_t pos; + + /// Buffer to hold history of the original data + uint8_t history[LZMA_DELTA_DISTANCE_MAX]; +}; + + +extern lzma_ret lzma_delta_coder_init( + lzma_next_coder *next, lzma_allocator *allocator, + const lzma_filter_info *filters, lzma_code_function code); + +#endif diff --git a/src/liblzma/common/delta_decoder.c b/src/liblzma/common/delta_decoder.c new file mode 100644 index 00000000..af2b840d --- /dev/null +++ b/src/liblzma/common/delta_decoder.c @@ -0,0 +1,102 @@ +/////////////////////////////////////////////////////////////////////////////// +// +/// \file delta_decoder.c +/// \brief Delta filter decoder +// +// Copyright (C) 2007, 2008 Lasse Collin +// +// This library is free software; you can redistribute it and/or +// modify it under the terms of the GNU Lesser General Public +// License as published by the Free Software Foundation; either +// version 2.1 of the License, or (at your option) any later version. +// +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +// Lesser General Public License for more details. +// +/////////////////////////////////////////////////////////////////////////////// + +#include "delta_decoder.h" +#include "delta_common.h" + + +/// Copies and decodes the data at the same time. This is used when Delta +/// is the last filter in the chain. +static void +copy_and_decode(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) { + out[i] = in[i] + coder->history[ + (distance + coder->pos) & 0xFF]; + coder->history[coder->pos-- & 0xFF] = out[i]; + } +} + + +/// Decodes the data in place. This is used when we are not the last filter +/// in the chain. +static void +decode_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) { + buffer[i] += coder->history[(distance + coder->pos) & 0xFF]; + coder->history[coder->pos-- & 0xFF] = buffer[i]; + } +} + + + +static lzma_ret +delta_decode(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) { + // Limit in_size so that we don't copy too much. + if ((lzma_vli)(in_size - *in_pos) > coder->uncompressed_size) + in_size = *in_pos + (size_t)(coder->uncompressed_size); + + const size_t in_avail = in_size - *in_pos; + const size_t out_avail = out_size - *out_pos; + const size_t size = MIN(in_avail, out_avail); + + copy_and_decode(coder, in + *in_pos, out + *out_pos, size); + + *in_pos += size; + *out_pos += size; + + assert(coder->uncompressed_size <= LZMA_VLI_VALUE_MAX); + coder->uncompressed_size -= size; + + ret = coder->uncompressed_size == 0 + ? 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); + + decode_in_place(coder, out + out_start, *out_pos - out_start); + } + + return ret; +} + + +extern lzma_ret +lzma_delta_decoder_init(lzma_next_coder *next, lzma_allocator *allocator, + const lzma_filter_info *filters) +{ + return lzma_delta_coder_init(next, allocator, filters, &delta_decode); +} diff --git a/src/liblzma/common/delta_coder.h b/src/liblzma/common/delta_decoder.h index 60cea95c..bef9f58a 100644 --- a/src/liblzma/common/delta_coder.h +++ b/src/liblzma/common/delta_decoder.h @@ -1,7 +1,7 @@ /////////////////////////////////////////////////////////////////////////////// // -/// \file delta_coder.h -/// \brief The Delta filter encoder and decoder +/// \file delta_decoder.h +/// \brief Delta filter decoder // // Copyright (C) 2007 Lasse Collin // @@ -17,14 +17,11 @@ // /////////////////////////////////////////////////////////////////////////////// -#ifndef LZMA_DELTA_CODER_H -#define LZMA_DELTA_CODER_H +#ifndef LZMA_DELTA_DECODER_H +#define LZMA_DELTA_DECODER_H #include "common.h" -extern lzma_ret lzma_delta_encoder_init(lzma_next_coder *next, - lzma_allocator *allocator, const lzma_filter_info *filters); - extern lzma_ret lzma_delta_decoder_init(lzma_next_coder *next, lzma_allocator *allocator, const lzma_filter_info *filters); diff --git a/src/liblzma/common/delta_encoder.c b/src/liblzma/common/delta_encoder.c new file mode 100644 index 00000000..b94f92de --- /dev/null +++ b/src/liblzma/common/delta_encoder.c @@ -0,0 +1,97 @@ +/////////////////////////////////////////////////////////////////////////////// +// +/// \file delta_encoder.c +/// \brief Delta filter encoder +// +// Copyright (C) 2007, 2008 Lasse Collin +// +// This library is free software; you can redistribute it and/or +// modify it under the terms of the GNU Lesser General Public +// License as published by the Free Software Foundation; either +// version 2.1 of the License, or (at your option) any later version. +// +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +// Lesser General Public License for more details. +// +/////////////////////////////////////////////////////////////////////////////// + +#include "delta_encoder.h" +#include "delta_common.h" + + +/// Copies and encodes the data at the same time. This is used when Delta +/// is the last filter in the chain. +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 not the last filter +/// in the chain. +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 = 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; +} + + +extern lzma_ret +lzma_delta_encoder_init(lzma_next_coder *next, lzma_allocator *allocator, + const lzma_filter_info *filters) +{ + return lzma_delta_coder_init(next, allocator, filters, &delta_encode); +} diff --git a/src/liblzma/common/delta_encoder.h b/src/liblzma/common/delta_encoder.h new file mode 100644 index 00000000..c669458d --- /dev/null +++ b/src/liblzma/common/delta_encoder.h @@ -0,0 +1,28 @@ +/////////////////////////////////////////////////////////////////////////////// +// +/// \file delta_encoder.h +/// \brief Delta filter encoder +// +// Copyright (C) 2007 Lasse Collin +// +// This library is free software; you can redistribute it and/or +// modify it under the terms of the GNU Lesser General Public +// License as published by the Free Software Foundation; either +// version 2.1 of the License, or (at your option) any later version. +// +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +// Lesser General Public License for more details. +// +/////////////////////////////////////////////////////////////////////////////// + +#ifndef LZMA_DELTA_ENCODER_H +#define LZMA_DELTA_ENCODER_H + +#include "common.h" + +extern lzma_ret lzma_delta_encoder_init(lzma_next_coder *next, + lzma_allocator *allocator, const lzma_filter_info *filters); + +#endif diff --git a/src/liblzma/common/raw_decoder.c b/src/liblzma/common/raw_decoder.c index a11cb5c4..03f1d847 100644 --- a/src/liblzma/common/raw_decoder.c +++ b/src/liblzma/common/raw_decoder.c @@ -22,7 +22,7 @@ #include "simple_coder.h" #include "subblock_decoder.h" #include "subblock_decoder_helper.h" -#include "delta_coder.h" +#include "delta_decoder.h" #include "lzma_decoder.h" #include "metadata_decoder.h" diff --git a/src/liblzma/common/raw_encoder.c b/src/liblzma/common/raw_encoder.c index c2cd0a51..cd1f34db 100644 --- a/src/liblzma/common/raw_encoder.c +++ b/src/liblzma/common/raw_encoder.c @@ -21,7 +21,7 @@ #include "copy_coder.h" #include "simple_coder.h" #include "subblock_encoder.h" -#include "delta_coder.h" +#include "delta_encoder.h" #include "lzma_encoder.h" |