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///////////////////////////////////////////////////////////////////////////////
//
/// \file code.c
/// \brief zlib-like API wrapper for liblzma's internal API
//
// 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 "common.h"
LZMA_API const lzma_stream LZMA_STREAM_INIT_VAR = {
.next_in = NULL,
.avail_in = 0,
.total_in = 0,
.next_out = NULL,
.avail_out = 0,
.total_out = 0,
.allocator = NULL,
.internal = NULL,
};
extern lzma_ret
lzma_strm_init(lzma_stream *strm)
{
if (strm == NULL)
return LZMA_PROG_ERROR;
if (strm->internal == NULL) {
strm->internal = lzma_alloc(sizeof(lzma_internal),
strm->allocator);
if (strm->internal == NULL)
return LZMA_MEM_ERROR;
strm->internal->next = LZMA_NEXT_CODER_INIT;
}
strm->internal->supported_actions[LZMA_RUN] = false;
strm->internal->supported_actions[LZMA_SYNC_FLUSH] = false;
strm->internal->supported_actions[LZMA_FULL_FLUSH] = false;
strm->internal->supported_actions[LZMA_FINISH] = false;
strm->internal->sequence = ISEQ_RUN;
strm->total_in = 0;
strm->total_out = 0;
return LZMA_OK;
}
extern LZMA_API lzma_ret
lzma_code(lzma_stream *strm, lzma_action action)
{
// Sanity checks
if ((strm->next_in == NULL && strm->avail_in != 0)
|| (strm->next_out == NULL && strm->avail_out != 0)
|| strm->internal == NULL
|| strm->internal->next.code == NULL
|| (unsigned int)(action) > LZMA_FINISH
|| !strm->internal->supported_actions[action])
return LZMA_PROG_ERROR;
switch (strm->internal->sequence) {
case ISEQ_RUN:
switch (action) {
case LZMA_RUN:
break;
case LZMA_SYNC_FLUSH:
strm->internal->sequence = ISEQ_SYNC_FLUSH;
break;
case LZMA_FULL_FLUSH:
strm->internal->sequence = ISEQ_FULL_FLUSH;
break;
case LZMA_FINISH:
strm->internal->sequence = ISEQ_FINISH;
break;
}
break;
case ISEQ_SYNC_FLUSH:
if (action != LZMA_SYNC_FLUSH)
return LZMA_PROG_ERROR;
// Check that application doesn't change avail_in once
// LZMA_SYNC_FLUSH has been used.
if (strm->internal->avail_in != strm->avail_in)
return LZMA_DATA_ERROR;
break;
case ISEQ_FULL_FLUSH:
if (action != LZMA_FULL_FLUSH)
return LZMA_PROG_ERROR;
// Check that application doesn't change avail_in once
// LZMA_FULL_FLUSH has been used.
if (strm->internal->avail_in != strm->avail_in)
return LZMA_DATA_ERROR;
break;
case ISEQ_FINISH:
if (action != LZMA_FINISH)
return LZMA_PROG_ERROR;
if (strm->internal->avail_in != strm->avail_in)
return LZMA_DATA_ERROR;
break;
case ISEQ_END:
return LZMA_STREAM_END;
case ISEQ_ERROR:
default:
return LZMA_PROG_ERROR;
}
size_t in_pos = 0;
size_t out_pos = 0;
lzma_ret ret = strm->internal->next.code(
strm->internal->next.coder, strm->allocator,
strm->next_in, &in_pos, strm->avail_in,
strm->next_out, &out_pos, strm->avail_out, action);
strm->next_in += in_pos;
strm->avail_in -= in_pos;
strm->total_in += in_pos;
strm->next_out += out_pos;
strm->avail_out -= out_pos;
strm->total_out += out_pos;
strm->internal->avail_in = strm->avail_in;
switch (ret) {
case LZMA_OK:
// Don't return LZMA_BUF_ERROR when it happens the first time.
// This is to avoid returning LZMA_BUF_ERROR when avail_out
// was zero but still there was no more data left to written
// to next_out.
if (out_pos == 0 && in_pos == 0) {
if (strm->internal->allow_buf_error)
ret = LZMA_BUF_ERROR;
else
strm->internal->allow_buf_error = true;
} else {
strm->internal->allow_buf_error = false;
}
break;
case LZMA_STREAM_END:
if (strm->internal->sequence == ISEQ_SYNC_FLUSH
|| strm->internal->sequence == ISEQ_FULL_FLUSH)
strm->internal->sequence = ISEQ_RUN;
else
strm->internal->sequence = ISEQ_END;
break;
case LZMA_UNSUPPORTED_CHECK:
strm->internal->allow_buf_error = false;
break;
default:
// All the other errors are fatal; coding cannot be continued.
strm->internal->sequence = ISEQ_ERROR;
break;
}
return ret;
}
extern LZMA_API void
lzma_end(lzma_stream *strm)
{
if (strm != NULL && strm->internal != NULL) {
if (strm->internal->next.end != NULL)
strm->internal->next.end(strm->internal->next.coder,
strm->allocator);
lzma_free(strm->internal, strm->allocator);
strm->internal = NULL;
}
return;
}
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