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author | mm <mm@FreeBSD.org> | 2010-05-10 06:59:50 +0000 |
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committer | mm <mm@FreeBSD.org> | 2010-05-10 06:59:50 +0000 |
commit | 5c358d45429b654efa9c8177ecd370a7965ec1a7 (patch) | |
tree | d2d916954c6a66a3168ee356b5f24da01c2017d6 /contrib/xz/src/liblzma/common/alone_encoder.c | |
parent | 3e09decd1986826f54af1a47be97bb87c1220783 (diff) | |
parent | 1008b7c6744a190c5b15aaf8cab1054671e4c7c3 (diff) | |
download | FreeBSD-src-5c358d45429b654efa9c8177ecd370a7965ec1a7.zip FreeBSD-src-5c358d45429b654efa9c8177ecd370a7965ec1a7.tar.gz |
Import of liblzma, xz, xzdec, lzmainfo from vendor branch
Add support for xz and lzma to lesspipe.sh (xzless, lzless)
Bump __FreeBSD_version
Approved by: delphij (mentor)
MFC after: 2 weeks
Diffstat (limited to 'contrib/xz/src/liblzma/common/alone_encoder.c')
-rw-r--r-- | contrib/xz/src/liblzma/common/alone_encoder.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/contrib/xz/src/liblzma/common/alone_encoder.c b/contrib/xz/src/liblzma/common/alone_encoder.c new file mode 100644 index 0000000..d8c0170 --- /dev/null +++ b/contrib/xz/src/liblzma/common/alone_encoder.c @@ -0,0 +1,157 @@ +/////////////////////////////////////////////////////////////////////////////// +// +/// \file alone_decoder.c +/// \brief Decoder for LZMA_Alone files +// +// Author: Lasse Collin +// +// This file has been put into the public domain. +// You can do whatever you want with this file. +// +/////////////////////////////////////////////////////////////////////////////// + +#include "common.h" +#include "lzma_encoder.h" + + +#define ALONE_HEADER_SIZE (1 + 4 + 8) + + +struct lzma_coder_s { + lzma_next_coder next; + + enum { + SEQ_HEADER, + SEQ_CODE, + } sequence; + + size_t header_pos; + uint8_t header[ALONE_HEADER_SIZE]; +}; + + +static lzma_ret +alone_encode(lzma_coder *coder, + lzma_allocator *allocator lzma_attribute((unused)), + 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) +{ + while (*out_pos < out_size) + switch (coder->sequence) { + case SEQ_HEADER: + lzma_bufcpy(coder->header, &coder->header_pos, + ALONE_HEADER_SIZE, + out, out_pos, out_size); + if (coder->header_pos < ALONE_HEADER_SIZE) + return LZMA_OK; + + coder->sequence = SEQ_CODE; + break; + + case SEQ_CODE: + return coder->next.code(coder->next.coder, + allocator, in, in_pos, in_size, + out, out_pos, out_size, action); + + default: + assert(0); + return LZMA_PROG_ERROR; + } + + return LZMA_OK; +} + + +static void +alone_encoder_end(lzma_coder *coder, lzma_allocator *allocator) +{ + lzma_next_end(&coder->next, allocator); + lzma_free(coder, allocator); + return; +} + + +// At least for now, this is not used by any internal function. +static lzma_ret +alone_encoder_init(lzma_next_coder *next, lzma_allocator *allocator, + const lzma_options_lzma *options) +{ + lzma_next_coder_init(&alone_encoder_init, next, allocator); + + if (next->coder == NULL) { + next->coder = lzma_alloc(sizeof(lzma_coder), allocator); + if (next->coder == NULL) + return LZMA_MEM_ERROR; + + next->code = &alone_encode; + next->end = &alone_encoder_end; + next->coder->next = LZMA_NEXT_CODER_INIT; + } + + // Basic initializations + next->coder->sequence = SEQ_HEADER; + next->coder->header_pos = 0; + + // Encode the header: + // - Properties (1 byte) + if (lzma_lzma_lclppb_encode(options, next->coder->header)) + return LZMA_OPTIONS_ERROR; + + // - Dictionary size (4 bytes) + if (options->dict_size < LZMA_DICT_SIZE_MIN) + return LZMA_OPTIONS_ERROR; + + // Round up to to the next 2^n or 2^n + 2^(n - 1) depending on which + // one is the next unless it is UINT32_MAX. While the header would + // allow any 32-bit integer, we do this to keep the decoder of liblzma + // accepting the resulting files. + uint32_t d = options->dict_size - 1; + d |= d >> 2; + d |= d >> 3; + d |= d >> 4; + d |= d >> 8; + d |= d >> 16; + if (d != UINT32_MAX) + ++d; + + unaligned_write32le(next->coder->header + 1, d); + + // - Uncompressed size (always unknown and using EOPM) + memset(next->coder->header + 1 + 4, 0xFF, 8); + + // Initialize the LZMA encoder. + const lzma_filter_info filters[2] = { + { + .init = &lzma_lzma_encoder_init, + .options = (void *)(options), + }, { + .init = NULL, + } + }; + + return lzma_next_filter_init(&next->coder->next, allocator, filters); +} + + +/* +extern lzma_ret +lzma_alone_encoder_init(lzma_next_coder *next, lzma_allocator *allocator, + const lzma_options_alone *options) +{ + lzma_next_coder_init(&alone_encoder_init, next, allocator, options); +} +*/ + + +extern LZMA_API(lzma_ret) +lzma_alone_encoder(lzma_stream *strm, const lzma_options_lzma *options) +{ + lzma_next_strm_init(alone_encoder_init, strm, options); + + strm->internal->supported_actions[LZMA_RUN] = true; + strm->internal->supported_actions[LZMA_FINISH] = true; + + return LZMA_OK; +} |