You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
92 lines
2.7 KiB
92 lines
2.7 KiB
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
/// \file stream_buffer_decoder.c
|
|
/// \brief Single-call .xz Stream decoder
|
|
//
|
|
// Author: Lasse Collin
|
|
//
|
|
// This file has been put into the public domain.
|
|
// You can do whatever you want with this file.
|
|
//
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
#include "stream_decoder.h"
|
|
|
|
|
|
extern LZMA_API(lzma_ret)
|
|
lzma_stream_buffer_decode(uint64_t *memlimit, uint32_t flags,
|
|
const lzma_allocator *allocator,
|
|
const uint8_t *in, size_t *in_pos, size_t in_size,
|
|
uint8_t *out, size_t *out_pos, size_t out_size)
|
|
{
|
|
// Sanity checks
|
|
if (in_pos == NULL || (in == NULL && *in_pos != in_size)
|
|
|| *in_pos > in_size || out_pos == NULL
|
|
|| (out == NULL && *out_pos != out_size)
|
|
|| *out_pos > out_size)
|
|
return LZMA_PROG_ERROR;
|
|
|
|
// Catch flags that are not allowed in buffer-to-buffer decoding.
|
|
if (flags & LZMA_TELL_ANY_CHECK)
|
|
return LZMA_PROG_ERROR;
|
|
|
|
// Initialize the Stream decoder.
|
|
// TODO: We need something to tell the decoder that it can use the
|
|
// output buffer as workspace, and thus save significant amount of RAM.
|
|
lzma_next_coder stream_decoder = LZMA_NEXT_CODER_INIT;
|
|
lzma_ret ret = lzma_stream_decoder_init(
|
|
&stream_decoder, allocator, *memlimit, flags);
|
|
|
|
if (ret == LZMA_OK) {
|
|
// Save the positions so that we can restore them in case
|
|
// an error occurs.
|
|
const size_t in_start = *in_pos;
|
|
const size_t out_start = *out_pos;
|
|
|
|
// Do the actual decoding.
|
|
ret = stream_decoder.code(stream_decoder.coder, allocator,
|
|
in, in_pos, in_size, out, out_pos, out_size,
|
|
LZMA_FINISH);
|
|
|
|
if (ret == LZMA_STREAM_END) {
|
|
ret = LZMA_OK;
|
|
} else {
|
|
// Something went wrong, restore the positions.
|
|
*in_pos = in_start;
|
|
*out_pos = out_start;
|
|
|
|
if (ret == LZMA_OK) {
|
|
// Either the input was truncated or the
|
|
// output buffer was too small.
|
|
assert(*in_pos == in_size
|
|
|| *out_pos == out_size);
|
|
|
|
// If all the input was consumed, then the
|
|
// input is truncated, even if the output
|
|
// buffer is also full. This is because
|
|
// processing the last byte of the Stream
|
|
// never produces output.
|
|
if (*in_pos == in_size)
|
|
ret = LZMA_DATA_ERROR;
|
|
else
|
|
ret = LZMA_BUF_ERROR;
|
|
|
|
} else if (ret == LZMA_MEMLIMIT_ERROR) {
|
|
// Let the caller know how much memory would
|
|
// have been needed.
|
|
uint64_t memusage;
|
|
(void)stream_decoder.memconfig(
|
|
stream_decoder.coder,
|
|
memlimit, &memusage, 0);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Free the decoder memory. This needs to be done even if
|
|
// initialization fails, because the internal API doesn't
|
|
// require the initialization function to free its memory on error.
|
|
lzma_next_end(&stream_decoder, allocator);
|
|
|
|
return ret;
|
|
}
|