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Diffstat (limited to 'src/liblzma/common/copy_coder.c')
| -rw-r--r-- | src/liblzma/common/copy_coder.c | 144 |
1 files changed, 0 insertions, 144 deletions
diff --git a/src/liblzma/common/copy_coder.c b/src/liblzma/common/copy_coder.c deleted file mode 100644 index 0bd674f6..00000000 --- a/src/liblzma/common/copy_coder.c +++ /dev/null @@ -1,144 +0,0 @@ -/////////////////////////////////////////////////////////////////////////////// -// -/// \file copy_coder.c -/// \brief The Copy filter 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 "copy_coder.h" - - -struct lzma_coder_s { - lzma_next_coder next; - lzma_vli uncompressed_size; -}; - - -#ifdef HAVE_ENCODER -static lzma_ret -copy_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 we aren't the last filter in the chain, the Copy filter - // is totally useless. Note that it is job of the next coder to - // take care of Uncompressed Size, so we don't need to update our - // coder->uncompressed_size at all. - if (coder->next.code != NULL) - return coder->next.code(coder->next.coder, allocator, - in, in_pos, in_size, out, out_pos, out_size, - action); - - // We are the last coder in the chain. - // Just copy as much data as possible. - bufcpy(in, in_pos, in_size, out, out_pos, out_size); - - // LZMA_SYNC_FLUSH and LZMA_FINISH are the same thing for us. - if (action != LZMA_RUN && *in_pos == in_size) - return LZMA_STREAM_END; - - return LZMA_OK; -} -#endif - - -#ifdef HAVE_DECODER -static lzma_ret -copy_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) -{ - if (coder->next.code != NULL) - return coder->next.code(coder->next.coder, allocator, - in, in_pos, in_size, out, out_pos, out_size, - action); - - assert(coder->uncompressed_size <= LZMA_VLI_VALUE_MAX); - - const size_t in_avail = in_size - *in_pos; - - // Limit in_size so that we don't copy too much. - if ((lzma_vli)(in_avail) > coder->uncompressed_size) - in_size = *in_pos + (size_t)(coder->uncompressed_size); - - // We are the last coder in the chain. - // Just copy as much data as possible. - const size_t in_used = bufcpy( - in, in_pos, in_size, out, out_pos, out_size); - - // Update uncompressed_size if it is known. - if (coder->uncompressed_size != LZMA_VLI_VALUE_UNKNOWN) - coder->uncompressed_size -= in_used; - - return coder->uncompressed_size == 0 ? LZMA_STREAM_END : LZMA_OK; -} -#endif - - -static void -copy_coder_end(lzma_coder *coder, lzma_allocator *allocator) -{ - lzma_next_coder_end(&coder->next, allocator); - lzma_free(coder, allocator); - return; -} - - -static lzma_ret -copy_coder_init(lzma_next_coder *next, lzma_allocator *allocator, - const lzma_filter_info *filters, lzma_code_function encode) -{ - // 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 = encode; - next->end = ©_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; - - // 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_copy_encoder_init(lzma_next_coder *next, lzma_allocator *allocator, - const lzma_filter_info *filters) -{ - lzma_next_coder_init(copy_coder_init, next, allocator, filters, - ©_encode); -} -#endif - - -#ifdef HAVE_DECODER -extern lzma_ret -lzma_copy_decoder_init(lzma_next_coder *next, lzma_allocator *allocator, - const lzma_filter_info *filters) -{ - lzma_next_coder_init(copy_coder_init, next, allocator, filters, - ©_decode); -} -#endif |