* along with wimlib; if not, see http://www.gnu.org/licenses/.
*/
-/*
+/*
* This file has been modified from code taken from cabextract v0.5, which was,
* itself, a modified version of the lzx decompression code from unlzx. The
* code has been customized for wimlib.
*
*/
-/*
+/*
* Some more notes about errors in Microsoft's documentation:
*
* Microsoft's LZX document and their implementation of the com.ms.util.cab Java
/* Huffman decoding tables and maps from symbols to code lengths. */
struct lzx_tables {
- u16 maintree_decode_table[(1 << LZX_MAINTREE_TABLEBITS) +
+ u16 maintree_decode_table[(1 << LZX_MAINTREE_TABLEBITS) +
(LZX_MAINTREE_NUM_SYMBOLS * 2)];
u8 maintree_lens[LZX_MAINTREE_NUM_SYMBOLS];
- u16 lentree_decode_table[(1 << LZX_LENTREE_TABLEBITS) +
+ u16 lentree_decode_table[(1 << LZX_LENTREE_TABLEBITS) +
(LZX_LENTREE_NUM_SYMBOLS * 2)];
u8 lentree_lens[LZX_LENTREE_NUM_SYMBOLS];
- u16 alignedtree_decode_table[(1 << LZX_ALIGNEDTREE_TABLEBITS) +
+ u16 alignedtree_decode_table[(1 << LZX_ALIGNEDTREE_TABLEBITS) +
(LZX_ALIGNEDTREE_NUM_SYMBOLS * 2)];
u8 alignedtree_lens[LZX_ALIGNEDTREE_NUM_SYMBOLS];
};
-/*
- * Reads a Huffman-encoded symbol using the pre-tree.
+/*
+ * Reads a Huffman-encoded symbol using the pre-tree.
*/
-static inline int read_huffsym_using_pretree(struct input_bitstream *istream,
+static inline int read_huffsym_using_pretree(struct input_bitstream *istream,
const u16 pretree_decode_table[],
const u8 pretree_lens[], uint *n)
{
- return read_huffsym(istream, pretree_decode_table, pretree_lens,
+ return read_huffsym(istream, pretree_decode_table, pretree_lens,
LZX_PRETREE_NUM_SYMBOLS, LZX_PRETREE_TABLEBITS, n,
LZX_MAX_CODEWORD_LEN);
}
/* Reads a Huffman-encoded symbol using the main tree. */
-static inline int read_huffsym_using_maintree(struct input_bitstream *istream,
- const struct lzx_tables *tables,
+static inline int read_huffsym_using_maintree(struct input_bitstream *istream,
+ const struct lzx_tables *tables,
uint *n)
{
- return read_huffsym(istream, tables->maintree_decode_table,
+ return read_huffsym(istream, tables->maintree_decode_table,
tables->maintree_lens, LZX_MAINTREE_NUM_SYMBOLS,
LZX_MAINTREE_TABLEBITS, n, LZX_MAX_CODEWORD_LEN);
}
/* Reads a Huffman-encoded symbol using the length tree. */
-static inline int read_huffsym_using_lentree(struct input_bitstream *istream,
- const struct lzx_tables *tables,
+static inline int read_huffsym_using_lentree(struct input_bitstream *istream,
+ const struct lzx_tables *tables,
uint *n)
{
- return read_huffsym(istream, tables->lentree_decode_table,
- tables->lentree_lens, LZX_LENTREE_NUM_SYMBOLS,
+ return read_huffsym(istream, tables->lentree_decode_table,
+ tables->lentree_lens, LZX_LENTREE_NUM_SYMBOLS,
LZX_LENTREE_TABLEBITS, n, LZX_MAX_CODEWORD_LEN);
}
/* Reads a Huffman-encoded symbol using the aligned offset tree. */
-static inline int read_huffsym_using_alignedtree(struct input_bitstream *istream,
- const struct lzx_tables *tables,
+static inline int read_huffsym_using_alignedtree(struct input_bitstream *istream,
+ const struct lzx_tables *tables,
uint *n)
{
- return read_huffsym(istream, tables->alignedtree_decode_table,
+ return read_huffsym(istream, tables->alignedtree_decode_table,
tables->alignedtree_lens,
- LZX_ALIGNEDTREE_NUM_SYMBOLS,
+ LZX_ALIGNEDTREE_NUM_SYMBOLS,
LZX_ALIGNEDTREE_TABLEBITS, n, 8);
}
-/*
+/*
* Reads the pretree from the input, then uses the pretree to decode @num_lens
- * code length values from the input.
+ * code length values from the input.
*
* @istream: The bit stream for the input. It is positioned on the beginning
* of the pretree for the code length values.
* @lens: An array that contains the length values from the previous time
* the code lengths for this Huffman tree were read, or all
- * 0's if this is the first time.
+ * 0's if this is the first time.
* @num_lens: Number of length values to decode and return.
*
*/
-static int lzx_read_code_lens(struct input_bitstream *istream, u8 lens[],
+static int lzx_read_code_lens(struct input_bitstream *istream, u8 lens[],
uint num_lens)
{
/* Declare the decoding table and length table for the pretree. */
- u16 pretree_decode_table[(1 << LZX_PRETREE_TABLEBITS) +
+ u16 pretree_decode_table[(1 << LZX_PRETREE_TABLEBITS) +
(LZX_PRETREE_NUM_SYMBOLS * 2)];
u8 pretree_lens[LZX_PRETREE_NUM_SYMBOLS];
uint i;
/* Read the code lengths of the pretree codes. There are 20 lengths of
* 4 bits each. */
for (i = 0; i < LZX_PRETREE_NUM_SYMBOLS; i++) {
- ret = bitstream_read_bits(istream, LZX_PRETREE_ELEMENT_SIZE,
+ ret = bitstream_read_bits(istream, LZX_PRETREE_ELEMENT_SIZE,
&len);
if (ret != 0)
return ret;
}
/* Make the decoding table for the pretree. */
- ret = make_huffman_decode_table(pretree_decode_table,
- LZX_PRETREE_NUM_SYMBOLS,
- LZX_PRETREE_TABLEBITS,
- pretree_lens,
+ ret = make_huffman_decode_table(pretree_decode_table,
+ LZX_PRETREE_NUM_SYMBOLS,
+ LZX_PRETREE_TABLEBITS,
+ pretree_lens,
LZX_MAX_CODEWORD_LEN);
if (ret != 0)
return ret;
* input. */
uint tree_code;
uint num_zeroes;
- uint code;
+ uint code;
uint num_same;
char value;
- ret = read_huffsym_using_pretree(istream, pretree_decode_table,
+ ret = read_huffsym_using_pretree(istream, pretree_decode_table,
pretree_lens, &tree_code);
if (ret != 0)
return ret;
return ret;
num_same += 4;
- ret = read_huffsym_using_pretree(istream,
- pretree_decode_table,
+ ret = read_huffsym_using_pretree(istream,
+ pretree_decode_table,
pretree_lens, &code);
if (ret != 0)
return ret;
}
}
-/*
+/*
* Reads the header for an LZX-compressed block.
*
* @istream: The input bitstream.
* in bytes, will be returned.
* @block_type_ret: A pointer to an int into which the type of the block
* (LZX_BLOCKTYPE_*) will be returned.
- * @tables: A pointer to a lzx_tables structure in which the
+ * @tables: A pointer to a lzx_tables structure in which the
* main tree, the length tree, and possibly the
* aligned offset tree will be constructed.
* @queue: A pointer to the least-recently-used queue into which
* R0, R1, and R2 will be written (only for uncompressed
* blocks, which contain this information in the header)
*/
-static int lzx_read_block_header(struct input_bitstream *istream,
- int *block_size_ret, int *block_type_ret,
- struct lzx_tables *tables,
+static int lzx_read_block_header(struct input_bitstream *istream,
+ int *block_size_ret, int *block_type_ret,
+ struct lzx_tables *tables,
struct lru_queue *queue)
{
int ret;
ret = bitstream_read_bits(istream, 16, &block_size);
if (ret != 0)
return ret;
- block_size = to_le16(block_size);
+ block_size = le16_to_cpu(block_size);
}
switch (block_type) {
* then build it. */
for (i = 0; i < LZX_ALIGNEDTREE_NUM_SYMBOLS; i++) {
- ret = bitstream_read_bits(istream,
- LZX_ALIGNEDTREE_ELEMENT_SIZE,
+ ret = bitstream_read_bits(istream,
+ LZX_ALIGNEDTREE_ELEMENT_SIZE,
&len);
if (ret != 0)
return ret;
tables->alignedtree_lens[i] = len;
}
-
+
LZX_DEBUG("Building the aligned tree.");
ret = make_huffman_decode_table(tables->alignedtree_decode_table,
- LZX_ALIGNEDTREE_NUM_SYMBOLS,
+ LZX_ALIGNEDTREE_NUM_SYMBOLS,
LZX_ALIGNEDTREE_TABLEBITS,
tables->alignedtree_lens,
8);
LZX_DEBUG("Reading path lengths for main tree.");
/* Read the path lengths for the first 256 elements of the main
* tree. */
- ret = lzx_read_code_lens(istream, tables->maintree_lens,
+ ret = lzx_read_code_lens(istream, tables->maintree_lens,
LZX_NUM_CHARS);
if (ret != 0) {
ERROR("lzx_decompress(): Failed to read the code "
LZX_DEBUG("Reading path lengths for remaining elements of "
"main tree (%d elements).",
LZX_MAINTREE_NUM_SYMBOLS - LZX_NUM_CHARS);
- ret = lzx_read_code_lens(istream,
- tables->maintree_lens + LZX_NUM_CHARS,
+ ret = lzx_read_code_lens(istream,
+ tables->maintree_lens + LZX_NUM_CHARS,
LZX_MAINTREE_NUM_SYMBOLS - LZX_NUM_CHARS);
if (ret != 0) {
ERROR("lzx_decompress(): Failed to read the path "
ret = make_huffman_decode_table(tables->maintree_decode_table,
LZX_MAINTREE_NUM_SYMBOLS,
LZX_MAINTREE_TABLEBITS,
- tables->maintree_lens,
+ tables->maintree_lens,
LZX_MAX_CODEWORD_LEN);
if (ret != 0) {
ERROR("lzx_decompress(): Failed to make the decode "
}
LZX_DEBUG("Reading path lengths for the length tree.");
- ret = lzx_read_code_lens(istream, tables->lentree_lens,
+ ret = lzx_read_code_lens(istream, tables->lentree_lens,
LZX_LENTREE_NUM_SYMBOLS);
if (ret != 0) {
ERROR("lzx_decompress(): Failed to read the path "
LZX_DEBUG("Building the length tree.");
ret = make_huffman_decode_table(tables->lentree_decode_table,
- LZX_LENTREE_NUM_SYMBOLS,
+ LZX_LENTREE_NUM_SYMBOLS,
LZX_LENTREE_TABLEBITS,
- tables->lentree_lens,
+ tables->lentree_lens,
LZX_MAX_CODEWORD_LEN);
if (ret != 0) {
ERROR("lzx_decompress(): Failed to build the length "
ret = bitstream_read_bytes(istream, sizeof(R), R);
if (ret != 0)
return ret;
- array_to_le32(R, ARRAY_LEN(R));
- queue->R0 = R[0];
- queue->R1 = R[1];
- queue->R2 = R[2];
+ queue->R0 = le32_to_cpu(R[0]);
+ queue->R1 = le32_to_cpu(R[1]);
+ queue->R2 = le32_to_cpu(R[2]);
break;
default:
LZX_DEBUG("Found invalid block.");
return 0;
}
-/*
+/*
* Decodes a compressed literal match value. It refers to some match_offset to
* a point earlier in the window, and some match_len, for which the data is to
* be copied to the current position in the window.
* the amount of data needing to be uncompressed, or match refers to data before
* the window, or the input bitstream ended unexpectedly).
*/
-static int lzx_decode_match(int main_element, int block_type,
- int bytes_remaining, u8 *window, int window_pos,
- const struct lzx_tables *tables,
- struct lru_queue *queue,
+static int lzx_decode_match(int main_element, int block_type,
+ int bytes_remaining, u8 *window, int window_pos,
+ const struct lzx_tables *tables,
+ struct lru_queue *queue,
struct input_bitstream *istream)
{
uint length_header;
* tree, offset by 9 (LZX_MIN_MATCH + LZX_NUM_PRIMARY_LENS) */
match_len = LZX_MIN_MATCH + length_header;
if (length_header == LZX_NUM_PRIMARY_LENS) {
- ret = read_huffsym_using_lentree(istream, tables,
+ ret = read_huffsym_using_lentree(istream, tables,
&additional_len);
if (ret != 0)
return -1;
* equal to 3. (Note that in the case with
* num_extra_bits == 3, the assignment to verbatim_bits
* will just set it to 0. ) */
- ret = bitstream_read_bits(istream, num_extra_bits - 3,
+ ret = bitstream_read_bits(istream, num_extra_bits - 3,
&verbatim_bits);
if (ret != 0)
return -1;
verbatim_bits <<= 3;
- ret = read_huffsym_using_alignedtree(istream, tables,
+ ret = read_huffsym_using_alignedtree(istream, tables,
&aligned_bits);
if (ret != 0)
return -1;
* less than 3 extra bits, the extra bits are added
* directly to the match offset, and the correction for
* the alignment is taken to be 0. */
- ret = bitstream_read_bits(istream, num_extra_bits,
+ ret = bitstream_read_bits(istream, num_extra_bits,
&verbatim_bits);
if (ret != 0)
return -1;
}
/* Calculate the match offset. */
- match_offset = lzx_position_base[position_slot] + verbatim_bits +
+ match_offset = lzx_position_base[position_slot] + verbatim_bits +
aligned_bits - 2;
/* Update the LRU queue. */
* no bit to indicate that it actually is used, unlike in the LZX compressed
* format as used in other file formats, where a bit is reserved for that
* purpose. */
-static void undo_call_insn_preprocessing(u8 uncompressed_data[],
+static void undo_call_insn_preprocessing(u8 uncompressed_data[],
uint uncompressed_data_len)
{
int i = 0;
/* Not enabled in the last 6 bytes, which means the 5-byte call
* instruction cannot start in the last *10* bytes. */
- while (i < uncompressed_data_len - 10) {
+ while (i < uncompressed_data_len - 10) {
if (uncompressed_data[i] != 0xe8) {
i++;
continue;
}
- abs_offset = to_le32(*(int32_t*)(uncompressed_data + i + 1));
+ abs_offset = le32_to_cpu(*(int32_t*)(uncompressed_data + i + 1));
if (abs_offset >= -i && abs_offset < file_size) {
if (abs_offset >= 0) {
/* "compensating translation" */
rel_offset = abs_offset + file_size;
}
- *(int32_t*)(uncompressed_data + i + 1) =
- to_le32(rel_offset);
+ *(int32_t*)(uncompressed_data + i + 1) =
+ cpu_to_le32(rel_offset);
}
i += 5;
}
}
-/*
+/*
* Decompresses a compressed block of data from which the header has already
* been read.
*
* @block_size: The size of the block, in bytes.
* @window: Pointer to the decompression window.
* @window_pos: The current position in the window. Will be 0 for the first
- * block.
+ * block.
* @tables: The Huffman decoding tables for the block (main, length, and
* aligned offset, the latter only for LZX_BLOCKTYPE_ALIGNED)
* @queue: The least-recently-used queue for match offsets.
* @istream: The input bitstream for the compressed literals.
*/
-static int lzx_decompress_block(int block_type, int block_size, u8 *window,
- int window_pos,
- const struct lzx_tables *tables,
- struct lru_queue *queue,
+static int lzx_decompress_block(int block_type, int block_size, u8 *window,
+ int window_pos,
+ const struct lzx_tables *tables,
+ struct lru_queue *queue,
struct input_bitstream *istream)
{
uint bytes_remaining;
bytes_remaining = block_size;
while (bytes_remaining > 0) {
- ret = read_huffsym_using_maintree(istream, tables,
+ ret = read_huffsym_using_maintree(istream, tables,
&main_element);
if (ret != 0)
return ret;
if (main_element < LZX_NUM_CHARS) {
/* literal: 0 to LZX_NUM_CHARS - 1 */
- window[window_pos + block_size - bytes_remaining] =
+ window[window_pos + block_size - bytes_remaining] =
main_element;
bytes_remaining--;
} else {
/* match: LZX_NUM_CHARS to LZX_MAINTREE_NUM_SYMBOLS - 1 */
- match_len = lzx_decode_match(main_element,
+ match_len = lzx_decode_match(main_element,
block_type, bytes_remaining, window,
- block_size + window_pos -
+ block_size + window_pos -
bytes_remaining,
tables, queue, istream);
if (match_len == -1)
return 0;
}
-/*
+/*
* Decompresses a block of LZX-compressed data using a window size of 32768.
*
* @compressed_data: A pointer to the compressed data.
- * @compressed_len: The length of the compressed data, in bytes.
+ * @compressed_len: The length of the compressed data, in bytes.
* @uncompressed_data: A pointer to the buffer into which to write the
* uncompressed data.
* @uncompressed_len: The length of the uncompressed data.
*
* Return non-zero on failure.
*/
-int lzx_decompress(const void *compressed_data, uint compressed_len,
+int lzx_decompress(const void *compressed_data, uint compressed_len,
void *uncompressed_data, uint uncompressed_len)
{
struct lzx_tables tables;
while (bytes_remaining != 0) {
LZX_DEBUG("Reading block header.");
- ret = lzx_read_block_header(&istream, &block_size, &block_type,
+ ret = lzx_read_block_header(&istream, &block_size, &block_type,
&tables, &queue);
if (ret != 0)
return ret;
else
LZX_DEBUG("LZX_BLOCKTYPE_ALIGNED");
- ret = lzx_decompress_block(block_type,
+ ret = lzx_decompress_block(block_type,
block_size,
uncompressed_data,
uncompressed_len -
- bytes_remaining,
+ bytes_remaining,
&tables, &queue, &istream);
if (ret != 0)
return ret;
break;
case LZX_BLOCKTYPE_UNCOMPRESSED:
LZX_DEBUG("LZX_BLOCKTYPE_UNCOMPRESSED");
- ret = bitstream_read_bytes(&istream, block_size,
- uncompressed_data +
- uncompressed_len -
+ ret = bitstream_read_bytes(&istream, block_size,
+ uncompressed_data +
+ uncompressed_len -
bytes_remaining);
if (ret != 0)
return ret;
git://wimlib.net / wimlib / blobdiff