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///////////////////////////////////////////////////////////////////////////////
//
/// \file stream_encoder_single.c
/// \brief Encodes Single-Block .lzma files
//
// 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 "stream_common.h"
#include "block_encoder.h"
struct lzma_coder_s {
/// Uncompressed Size, Backward Size, and Footer Magic Bytes are
/// part of Block in the file format specification, but it is simpler
/// to implement them as part of Stream.
enum {
SEQ_HEADERS,
SEQ_DATA,
SEQ_FOOTER,
} sequence;
/// Block encoder
lzma_next_coder block_encoder;
/// Block encoder options
lzma_options_block block_options;
/// Stream Flags; we need to have these in this struct so that we
/// can encode Stream Footer.
lzma_stream_flags stream_flags;
/// Stream Header + Block Header, or Stream Footer
uint8_t *header;
size_t header_pos;
size_t header_size;
};
static lzma_ret
stream_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 *out_pos,
size_t out_size, lzma_action action)
{
// NOTE: We don't check if the amount of input is in the proper limits,
// because the Block encoder will do it for us.
while (*out_pos < out_size)
switch (coder->sequence) {
case SEQ_HEADERS:
bufcpy(coder->header, &coder->header_pos, coder->header_size,
out, out_pos, out_size);
if (coder->header_pos == coder->header_size) {
coder->header_pos = 0;
coder->sequence = SEQ_DATA;
}
break;
case SEQ_DATA: {
lzma_ret ret = coder->block_encoder.code(
coder->block_encoder.coder, allocator,
in, in_pos, in_size,
out, out_pos, out_size, action);
if (ret != LZMA_STREAM_END || action == LZMA_SYNC_FLUSH)
return ret;
assert(*in_pos == in_size);
assert(coder->header_size >= LZMA_STREAM_TAIL_SIZE);
coder->header_size = LZMA_STREAM_TAIL_SIZE;
ret = lzma_stream_tail_encode(
coder->header, &coder->stream_flags);
if (ret != LZMA_OK)
return ret;
coder->sequence = SEQ_FOOTER;
break;
}
case SEQ_FOOTER:
bufcpy(coder->header, &coder->header_pos, coder->header_size,
out, out_pos, out_size);
return coder->header_pos == coder->header_size
? LZMA_STREAM_END : LZMA_OK;
default:
return LZMA_PROG_ERROR;
}
return LZMA_OK;
}
static void
stream_encoder_end(lzma_coder *coder, lzma_allocator *allocator)
{
lzma_next_coder_end(&coder->block_encoder, allocator);
lzma_free(coder->header, allocator);
lzma_free(coder, allocator);
return;
}
static lzma_ret
stream_encoder_init(lzma_next_coder *next,
lzma_allocator *allocator, const lzma_options_stream *options)
{
if (options == NULL)
return LZMA_PROG_ERROR;
if (next->coder == NULL) {
next->coder = lzma_alloc(sizeof(lzma_coder), allocator);
if (next->coder == NULL)
return LZMA_MEM_ERROR;
next->code = &stream_encode;
next->end = &stream_encoder_end;
next->coder->block_encoder = LZMA_NEXT_CODER_INIT;
} else {
// Free the previous buffer, if any.
lzma_free(next->coder->header, allocator);
}
// At this point, next->coder->header points to nothing useful.
next->coder->header = NULL;
// Basic initializations
next->coder->sequence = SEQ_HEADERS;
next->coder->header_pos = 0;
// Initialize next->coder->stream_flags.
next->coder->stream_flags = (lzma_stream_flags){
.check = options->check,
.has_crc32 = options->has_crc32,
.is_multi = false,
};
// Initialize next->coder->block_options.
next->coder->block_options = (lzma_options_block){
.check = options->check,
.has_crc32 = options->has_crc32,
.has_eopm = options->uncompressed_size
== LZMA_VLI_VALUE_UNKNOWN,
.is_metadata = false,
.has_uncompressed_size_in_footer = options->uncompressed_size
== LZMA_VLI_VALUE_UNKNOWN,
.has_backward_size = true,
.handle_padding = false,
.compressed_size = LZMA_VLI_VALUE_UNKNOWN,
.uncompressed_size = options->uncompressed_size,
.compressed_reserve = 0,
.uncompressed_reserve = 0,
.total_size = LZMA_VLI_VALUE_UNKNOWN,
.total_limit = LZMA_VLI_VALUE_UNKNOWN,
.uncompressed_limit = LZMA_VLI_VALUE_UNKNOWN,
.padding = LZMA_BLOCK_HEADER_PADDING_AUTO,
.alignment = options->alignment + LZMA_STREAM_HEADER_SIZE,
};
memcpy(next->coder->block_options.filters, options->filters,
sizeof(options->filters));
return_if_error(lzma_block_header_size(&next->coder->block_options));
// Encode Stream Flags and Block Header into next->coder->header.
next->coder->header_size = (size_t)(LZMA_STREAM_HEADER_SIZE)
+ next->coder->block_options.header_size;
next->coder->header = lzma_alloc(next->coder->header_size, allocator);
if (next->coder->header == NULL)
return LZMA_MEM_ERROR;
return_if_error(lzma_stream_header_encode(next->coder->header,
&next->coder->stream_flags));
return_if_error(lzma_block_header_encode(
next->coder->header + LZMA_STREAM_HEADER_SIZE,
&next->coder->block_options));
// Initialize the Block encoder.
return lzma_block_encoder_init(&next->coder->block_encoder, allocator,
&next->coder->block_options);
}
/*
extern lzma_ret
lzma_stream_encoder_single_init(lzma_next_coder *next,
lzma_allocator *allocator, const lzma_options_stream *options)
{
lzma_next_coder_init(stream_encoder_init, allocator, options);
}
*/
extern LZMA_API lzma_ret
lzma_stream_encoder_single(
lzma_stream *strm, const lzma_options_stream *options)
{
lzma_next_strm_init(strm, stream_encoder_init, options);
strm->internal->supported_actions[LZMA_RUN] = true;
strm->internal->supported_actions[LZMA_FINISH] = true;
return LZMA_OK;
}
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