|
iPXE
|
DEFLATE decompression algorithm. More...
Go to the source code of this file.
Data Structures | |
| struct | deflate_huf_symbols |
| A Huffman-coded set of symbols of a given length. More... | |
| struct | deflate_alphabet |
| A Huffman-coded alphabet. More... | |
| struct | deflate_static_length_pattern |
| A static Huffman alphabet length pattern. More... | |
| struct | deflate |
| Decompressor. More... | |
| struct | deflate_chunk |
| A chunk of data. More... | |
Defines | |
| #define | DEFLATE_HEADER_BITS 3 |
| Block header length (in bits) | |
| #define | DEFLATE_HEADER_BFINAL_BIT 0 |
| Block header final block flags bit. | |
| #define | DEFLATE_HEADER_BTYPE_LSB 1 |
| Block header type LSB. | |
| #define | DEFLATE_HEADER_BTYPE_MASK 0x03 |
| Block header type mask. | |
| #define | DEFLATE_HEADER_BTYPE_LITERAL 0 |
| Block header type: literal data. | |
| #define | DEFLATE_HEADER_BTYPE_STATIC 1 |
| Block header type: static Huffman alphabet. | |
| #define | DEFLATE_HEADER_BTYPE_DYNAMIC 2 |
| Block header type: dynamic Huffman alphabet. | |
| #define | DEFLATE_LITERAL_LEN_BITS 16 |
| Literal header LEN/NLEN field length (in bits) | |
| #define | DEFLATE_DYNAMIC_BITS 14 |
| Dynamic header length (in bits) | |
| #define | DEFLATE_DYNAMIC_HLIT_LSB 0 |
| Dynamic header HLIT field LSB. | |
| #define | DEFLATE_DYNAMIC_HLIT_MASK 0x1f |
| Dynamic header HLIT field mask. | |
| #define | DEFLATE_DYNAMIC_HDIST_LSB 5 |
| Dynamic header HDIST field LSB. | |
| #define | DEFLATE_DYNAMIC_HDIST_MASK 0x1f |
| Dynamic header HDIST field mask. | |
| #define | DEFLATE_DYNAMIC_HCLEN_LSB 10 |
| Dynamic header HCLEN field LSB. | |
| #define | DEFLATE_DYNAMIC_HCLEN_MASK 0x0f |
| Dynamic header HCLEN field mask. | |
| #define | DEFLATE_CODELEN_BITS 3 |
| Dynamic header code length length (in bits) | |
| #define | DEFLATE_HUFFMAN_BITS 15 |
| Maximum length of a Huffman symbol (in bits) | |
| #define | DEFLATE_HUFFMAN_QL_BITS 7 |
| Quick lookup length for a Huffman symbol (in bits) | |
| #define | DEFLATE_HUFFMAN_QL_SHIFT ( 16 - DEFLATE_HUFFMAN_QL_BITS ) |
| Quick lookup shift. | |
| #define | DEFLATE_LITLEN_END 256 |
| Literal/length end of block code. | |
| #define | DEFLATE_LITLEN_MAX_CODE 287 |
| Maximum value of a literal/length code. | |
| #define | DEFLATE_DISTANCE_MAX_CODE 31 |
| Maximum value of a distance code. | |
| #define | DEFLATE_CODELEN_MAX_CODE 18 |
| Maximum value of a code length code. | |
| #define | ZLIB_HEADER_BITS 16 |
| ZLIB header length (in bits) | |
| #define | ZLIB_HEADER_CM_LSB 0 |
| ZLIB header compression method LSB. | |
| #define | ZLIB_HEADER_CM_MASK 0x0f |
| ZLIB header compression method mask. | |
| #define | ZLIB_HEADER_CM_DEFLATE 8 |
| ZLIB header compression method: DEFLATE. | |
| #define | ZLIB_HEADER_FDICT_BIT 13 |
| ZLIB header preset dictionary flag bit. | |
| #define | ZLIB_ADLER32_BITS 32 |
| ZLIB ADLER32 length (in bits) | |
Enumerations | |
| enum | deflate_format { DEFLATE_RAW, DEFLATE_ZLIB } |
| Compression formats. More... | |
Functions | |
| FILE_LICENCE (GPL2_OR_LATER_OR_UBDL) | |
| struct deflate_static_length_pattern | __attribute__ ((packed)) |
| static | __attribute__ ((always_inline)) void deflate_chunk_init(struct deflate_chunk *chunk |
| Initialise chunk of data. | |
| int | deflate_inflate (struct deflate *deflate, struct deflate_chunk *in, struct deflate_chunk *out) |
| Inflate compressed data. | |
Variables | |
| uint8_t | fill |
| Length pair. | |
| uint8_t | count |
| Repetition count. | |
| struct deflate | __attribute__ |
| static userptr_t | data |
| static userptr_t size_t | offset |
| Offset of the first segment within the content. | |
DEFLATE decompression algorithm.
Definition in file deflate.h.
| #define DEFLATE_HEADER_BITS 3 |
Block header length (in bits)
Definition at line 25 of file deflate.h.
Referenced by deflate_inflate().
| #define DEFLATE_HEADER_BFINAL_BIT 0 |
Block header final block flags bit.
Definition at line 28 of file deflate.h.
Referenced by deflate_inflate().
| #define DEFLATE_HEADER_BTYPE_LSB 1 |
| #define DEFLATE_HEADER_BTYPE_MASK 0x03 |
| #define DEFLATE_HEADER_BTYPE_LITERAL 0 |
Block header type: literal data.
Definition at line 37 of file deflate.h.
Referenced by deflate_inflate().
| #define DEFLATE_HEADER_BTYPE_STATIC 1 |
Block header type: static Huffman alphabet.
Definition at line 40 of file deflate.h.
Referenced by deflate_inflate().
| #define DEFLATE_HEADER_BTYPE_DYNAMIC 2 |
Block header type: dynamic Huffman alphabet.
Definition at line 43 of file deflate.h.
Referenced by deflate_inflate().
| #define DEFLATE_LITERAL_LEN_BITS 16 |
Literal header LEN/NLEN field length (in bits)
Definition at line 46 of file deflate.h.
Referenced by deflate_inflate().
| #define DEFLATE_DYNAMIC_BITS 14 |
Dynamic header length (in bits)
Definition at line 49 of file deflate.h.
Referenced by deflate_inflate().
| #define DEFLATE_DYNAMIC_HLIT_LSB 0 |
Dynamic header HLIT field LSB.
Definition at line 52 of file deflate.h.
Referenced by deflate_inflate().
| #define DEFLATE_DYNAMIC_HLIT_MASK 0x1f |
Dynamic header HLIT field mask.
Definition at line 55 of file deflate.h.
Referenced by deflate_inflate().
| #define DEFLATE_DYNAMIC_HDIST_LSB 5 |
Dynamic header HDIST field LSB.
Definition at line 58 of file deflate.h.
Referenced by deflate_inflate().
| #define DEFLATE_DYNAMIC_HDIST_MASK 0x1f |
Dynamic header HDIST field mask.
Definition at line 61 of file deflate.h.
Referenced by deflate_inflate().
| #define DEFLATE_DYNAMIC_HCLEN_LSB 10 |
Dynamic header HCLEN field LSB.
Definition at line 64 of file deflate.h.
Referenced by deflate_inflate().
| #define DEFLATE_DYNAMIC_HCLEN_MASK 0x0f |
Dynamic header HCLEN field mask.
Definition at line 67 of file deflate.h.
Referenced by deflate_inflate().
| #define DEFLATE_CODELEN_BITS 3 |
Dynamic header code length length (in bits)
Definition at line 70 of file deflate.h.
Referenced by deflate_inflate().
| #define DEFLATE_HUFFMAN_BITS 15 |
Maximum length of a Huffman symbol (in bits)
Definition at line 73 of file deflate.h.
Referenced by deflate_decode().
| #define DEFLATE_HUFFMAN_QL_BITS 7 |
Quick lookup length for a Huffman symbol (in bits)
This is a policy decision.
Definition at line 79 of file deflate.h.
Referenced by deflate_alphabet().
| #define DEFLATE_HUFFMAN_QL_SHIFT ( 16 - DEFLATE_HUFFMAN_QL_BITS ) |
Quick lookup shift.
Definition at line 82 of file deflate.h.
Referenced by deflate_alphabet(), and deflate_decode().
| #define DEFLATE_LITLEN_END 256 |
Literal/length end of block code.
Definition at line 85 of file deflate.h.
Referenced by deflate_inflate().
| #define DEFLATE_LITLEN_MAX_CODE 287 |
| #define DEFLATE_DISTANCE_MAX_CODE 31 |
| #define DEFLATE_CODELEN_MAX_CODE 18 |
Maximum value of a code length code.
Definition at line 94 of file deflate.h.
Referenced by deflate_inflate().
| #define ZLIB_HEADER_BITS 16 |
ZLIB header length (in bits)
Definition at line 97 of file deflate.h.
Referenced by deflate_inflate().
| #define ZLIB_HEADER_CM_LSB 0 |
ZLIB header compression method LSB.
Definition at line 100 of file deflate.h.
Referenced by deflate_inflate().
| #define ZLIB_HEADER_CM_MASK 0x0f |
ZLIB header compression method mask.
Definition at line 103 of file deflate.h.
Referenced by deflate_inflate().
| #define ZLIB_HEADER_CM_DEFLATE 8 |
ZLIB header compression method: DEFLATE.
Definition at line 106 of file deflate.h.
Referenced by deflate_inflate().
| #define ZLIB_HEADER_FDICT_BIT 13 |
ZLIB header preset dictionary flag bit.
Definition at line 109 of file deflate.h.
Referenced by deflate_inflate().
| #define ZLIB_ADLER32_BITS 32 |
ZLIB ADLER32 length (in bits)
Definition at line 112 of file deflate.h.
Referenced by deflate_inflate().
| enum deflate_format |
Compression formats.
Definition at line 17 of file deflate.h.
{
/** Raw DEFLATE data (no header or footer) */
DEFLATE_RAW,
/** ZLIB header and footer */
DEFLATE_ZLIB,
};
| FILE_LICENCE | ( | GPL2_OR_LATER_OR_UBDL | ) |
| struct deflate_static_length_pattern __attribute__ | ( | (packed) | ) |
| static __attribute__ | ( | (always_inline) | ) | [inline, static] |
Initialise chunk of data.
| chunk | Chunk of data to initialise |
| data | Data |
| offset | Starting offset |
| len | Length |
| int deflate_inflate | ( | struct deflate * | deflate, |
| struct deflate_chunk * | in, | ||
| struct deflate_chunk * | out | ||
| ) |
Inflate compressed data.
| deflate | Decompressor |
| in | Compressed input data |
| out | Output data buffer |
| rc | Return status code |
The caller can use deflate_finished() to determine whether a successful return indicates that the decompressor is merely waiting for more input.
Data will not be written beyond the specified end of the output data buffer, but the offset within the output data buffer will be updated to reflect the amount that should have been written. The caller can use this to find the length of the decompressed data before allocating the output data buffer.
Definition at line 492 of file deflate.c.
References assert, byte, cm, code, deflate_static_length_pattern::count, deflate_chunk::data, DBGC, DBGC2, DBGCP, deflate_accumulate(), DEFLATE_CODELEN_BITS, deflate_codelen_map, DEFLATE_CODELEN_MAX_CODE, deflate_copy(), deflate_decode(), deflate_discard_to_byte(), deflate_distance_base, DEFLATE_DYNAMIC_BITS, DEFLATE_DYNAMIC_HCLEN_LSB, DEFLATE_DYNAMIC_HCLEN_MASK, DEFLATE_DYNAMIC_HDIST_LSB, DEFLATE_DYNAMIC_HDIST_MASK, DEFLATE_DYNAMIC_HLIT_LSB, DEFLATE_DYNAMIC_HLIT_MASK, deflate_extract(), DEFLATE_HEADER_BFINAL_BIT, DEFLATE_HEADER_BITS, DEFLATE_HEADER_BTYPE_DYNAMIC, DEFLATE_HEADER_BTYPE_LITERAL, DEFLATE_HEADER_BTYPE_LSB, DEFLATE_HEADER_BTYPE_STATIC, DEFLATE_LITERAL_LEN_BITS, deflate_litlen_base, DEFLATE_LITLEN_END, DEFLATE_RAW, deflate_set_length(), DEFLATE_ZLIB, deflate::distance_codelen, deflate::distance_count, deflate::dup_distance, deflate::dup_len, EINVAL, ENOTSUP, deflate::extra_bits, deflate_static_length_pattern::fill, deflate::format, header, deflate::header, index, isprint(), deflate_chunk::len, len, deflate::length, deflate::length_index, deflate::length_target, deflate::lengths, deflate::litlen, deflate::litlen_count, memset(), NULL, deflate_chunk::offset, rc, deflate::remaining, deflate::resume, virt_to_user(), ZLIB_ADLER32_BITS, ZLIB_HEADER_BITS, ZLIB_HEADER_CM_DEFLATE, ZLIB_HEADER_CM_LSB, ZLIB_HEADER_CM_MASK, and ZLIB_HEADER_FDICT_BIT.
Referenced by deflate_okx(), and png_image_data().
{
/* This could be implemented more neatly if gcc offered a
* means for enforcing tail recursion.
*/
if ( deflate->resume ) {
goto *(deflate->resume);
} else switch ( deflate->format ) {
case DEFLATE_RAW: goto block_header;
case DEFLATE_ZLIB: goto zlib_header;
default: assert ( 0 );
}
zlib_header: {
int header;
int cm;
/* Extract header */
header = deflate_extract ( deflate, in, ZLIB_HEADER_BITS );
if ( header < 0 ) {
deflate->resume = &&zlib_header;
return 0;
}
/* Parse header */
cm = ( ( header >> ZLIB_HEADER_CM_LSB ) & ZLIB_HEADER_CM_MASK );
if ( cm != ZLIB_HEADER_CM_DEFLATE ) {
DBGC ( deflate, "DEFLATE %p unsupported ZLIB "
"compression method %d\n", deflate, cm );
return -ENOTSUP;
}
if ( header & ( 1 << ZLIB_HEADER_FDICT_BIT ) ) {
DBGC ( deflate, "DEFLATE %p unsupported ZLIB preset "
"dictionary\n", deflate );
return -ENOTSUP;
}
/* Process first block header */
goto block_header;
}
block_header: {
int header;
int bfinal;
int btype;
/* Extract block header */
header = deflate_extract ( deflate, in, DEFLATE_HEADER_BITS );
if ( header < 0 ) {
deflate->resume = &&block_header;
return 0;
}
/* Parse header */
deflate->header = header;
bfinal = ( header & ( 1 << DEFLATE_HEADER_BFINAL_BIT ) );
btype = ( header >> DEFLATE_HEADER_BTYPE_LSB );
DBGC ( deflate, "DEFLATE %p found %sblock type %#x\n",
deflate, ( bfinal ? "final " : "" ), btype );
switch ( btype ) {
case DEFLATE_HEADER_BTYPE_LITERAL:
goto literal_block;
case DEFLATE_HEADER_BTYPE_STATIC:
goto static_block;
case DEFLATE_HEADER_BTYPE_DYNAMIC:
goto dynamic_block;
default:
DBGC ( deflate, "DEFLATE %p unsupported block type "
"%#x\n", deflate, btype );
return -ENOTSUP;
}
}
literal_block: {
/* Discard any bits up to the next byte boundary */
deflate_discard_to_byte ( deflate );
}
literal_len: {
int len;
/* Extract LEN field */
len = deflate_extract ( deflate, in, DEFLATE_LITERAL_LEN_BITS );
if ( len < 0 ) {
deflate->resume = &&literal_len;
return 0;
}
/* Record length of literal data */
deflate->remaining = len;
DBGC2 ( deflate, "DEFLATE %p literal block length %#04zx\n",
deflate, deflate->remaining );
}
literal_nlen: {
int nlen;
/* Extract NLEN field */
nlen = deflate_extract ( deflate, in, DEFLATE_LITERAL_LEN_BITS);
if ( nlen < 0 ) {
deflate->resume = &&literal_nlen;
return 0;
}
/* Verify NLEN */
if ( ( ( deflate->remaining ^ ~nlen ) &
( ( 1 << DEFLATE_LITERAL_LEN_BITS ) - 1 ) ) != 0 ) {
DBGC ( deflate, "DEFLATE %p invalid len/nlen "
"%#04zx/%#04x\n", deflate,
deflate->remaining, nlen );
return -EINVAL;
}
}
literal_data: {
size_t in_remaining;
size_t len;
/* Calculate available amount of literal data */
in_remaining = ( in->len - in->offset );
len = deflate->remaining;
if ( len > in_remaining )
len = in_remaining;
/* Copy data to output buffer */
deflate_copy ( out, in->data, in->offset, len );
/* Consume data from input buffer */
in->offset += len;
deflate->remaining -= len;
/* Finish processing if we are blocked */
if ( deflate->remaining ) {
deflate->resume = &&literal_data;
return 0;
}
/* Otherwise, finish block */
goto block_done;
}
static_block: {
struct deflate_static_length_pattern *pattern;
uint8_t *lengths = deflate->lengths;
/* Construct static Huffman lengths as per RFC 1950 */
for ( pattern = deflate_static_length_patterns ;
pattern->count ; pattern++ ) {
memset ( lengths, pattern->fill, pattern->count );
lengths += pattern->count;
}
deflate->litlen_count = 288;
deflate->distance_count = 32;
goto construct_alphabets;
}
dynamic_block:
dynamic_header: {
int header;
unsigned int hlit;
unsigned int hdist;
unsigned int hclen;
/* Extract block header */
header = deflate_extract ( deflate, in, DEFLATE_DYNAMIC_BITS );
if ( header < 0 ) {
deflate->resume = &&dynamic_header;
return 0;
}
/* Parse header */
hlit = ( ( header >> DEFLATE_DYNAMIC_HLIT_LSB ) &
DEFLATE_DYNAMIC_HLIT_MASK );
hdist = ( ( header >> DEFLATE_DYNAMIC_HDIST_LSB ) &
DEFLATE_DYNAMIC_HDIST_MASK );
hclen = ( ( header >> DEFLATE_DYNAMIC_HCLEN_LSB ) &
DEFLATE_DYNAMIC_HCLEN_MASK );
deflate->litlen_count = ( hlit + 257 );
deflate->distance_count = ( hdist + 1 );
deflate->length_index = 0;
deflate->length_target = ( hclen + 4 );
DBGC2 ( deflate, "DEFLATE %p dynamic block %d codelen, %d "
"litlen, %d distance\n", deflate,
deflate->length_target, deflate->litlen_count,
deflate->distance_count );
/* Prepare for decoding code length code lengths */
memset ( &deflate->lengths, 0, sizeof ( deflate->lengths ) );
}
dynamic_codelen: {
int len;
unsigned int index;
int rc;
/* Extract all code lengths */
while ( deflate->length_index < deflate->length_target ) {
/* Extract code length length */
len = deflate_extract ( deflate, in,
DEFLATE_CODELEN_BITS );
if ( len < 0 ) {
deflate->resume = &&dynamic_codelen;
return 0;
}
/* Store code length */
index = deflate_codelen_map[deflate->length_index++];
deflate_set_length ( deflate, index, len );
DBGCP ( deflate, "DEFLATE %p codelen for %d is %d\n",
deflate, index, len );
}
/* Generate code length alphabet */
if ( ( rc = deflate_alphabet ( deflate,
&deflate->distance_codelen,
( DEFLATE_CODELEN_MAX_CODE + 1 ),
0 ) ) != 0 )
return rc;
/* Prepare for decoding literal/length/distance code lengths */
memset ( &deflate->lengths, 0, sizeof ( deflate->lengths ) );
deflate->length_index = 0;
deflate->length_target = ( deflate->litlen_count +
deflate->distance_count );
deflate->length = 0;
}
dynamic_litlen_distance: {
int len;
int index;
/* Decode literal/length/distance code length */
len = deflate_decode ( deflate, in, &deflate->distance_codelen);
if ( len < 0 ) {
deflate->resume = &&dynamic_litlen_distance;
return 0;
}
/* Prepare for extra bits */
if ( len < 16 ) {
deflate->length = len;
deflate->extra_bits = 0;
deflate->dup_len = 1;
} else {
static const uint8_t dup_len[3] = { 3, 3, 11 };
static const uint8_t extra_bits[3] = { 2, 3, 7 };
index = ( len - 16 );
deflate->dup_len = dup_len[index];
deflate->extra_bits = extra_bits[index];
if ( index )
deflate->length = 0;
}
}
dynamic_litlen_distance_extra: {
int extra;
unsigned int dup_len;
/* Extract extra bits */
extra = deflate_extract ( deflate, in, deflate->extra_bits );
if ( extra < 0 ) {
deflate->resume = &&dynamic_litlen_distance_extra;
return 0;
}
/* Store code lengths */
dup_len = ( deflate->dup_len + extra );
while ( ( deflate->length_index < deflate->length_target ) &&
dup_len-- ) {
deflate_set_length ( deflate, deflate->length_index++,
deflate->length );
}
/* Process next literal/length or distance code
* length, if more are required.
*/
if ( deflate->length_index < deflate->length_target )
goto dynamic_litlen_distance;
/* Construct alphabets */
goto construct_alphabets;
}
construct_alphabets: {
unsigned int distance_offset = deflate->litlen_count;
unsigned int distance_count = deflate->distance_count;
int rc;
/* Generate literal/length alphabet */
if ( ( rc = deflate_alphabet ( deflate, &deflate->litlen,
deflate->litlen_count, 0 ) ) !=0)
return rc;
/* Handle degenerate case of a single distance code
* (for which it is impossible to construct a valid,
* complete Huffman alphabet). RFC 1951 states:
*
* If only one distance code is used, it is encoded
* using one bit, not zero bits; in this case there
* is a single code length of one, with one unused
* code. One distance code of zero bits means that
* there are no distance codes used at all (the data
* is all literals).
*
* If we have only a single distance code, then we
* instead use two distance codes both with length 1.
* This results in a valid Huffman alphabet. The code
* "0" will mean distance code 0 (which is either
* correct or irrelevant), and the code "1" will mean
* distance code 1 (which is always irrelevant).
*/
if ( deflate->distance_count == 1 ) {
deflate->lengths[0] = 0x11;
distance_offset = 0;
distance_count = 2;
}
/* Generate distance alphabet */
if ( ( rc = deflate_alphabet ( deflate,
&deflate->distance_codelen,
distance_count,
distance_offset ) ) != 0 )
return rc;
}
lzhuf_litlen: {
int code;
uint8_t byte;
unsigned int extra;
unsigned int bits;
/* Decode Huffman codes */
while ( 1 ) {
/* Decode Huffman code */
code = deflate_decode ( deflate, in, &deflate->litlen );
if ( code < 0 ) {
deflate->resume = &&lzhuf_litlen;
return 0;
}
/* Handle according to code type */
if ( code < DEFLATE_LITLEN_END ) {
/* Literal value: copy to output buffer */
byte = code;
DBGCP ( deflate, "DEFLATE %p literal %#02x "
"('%c')\n", deflate, byte,
( isprint ( byte ) ? byte : '.' ) );
deflate_copy ( out, virt_to_user ( &byte ), 0,
sizeof ( byte ) );
} else if ( code == DEFLATE_LITLEN_END ) {
/* End of block */
goto block_done;
} else {
/* Length code: process extra bits */
extra = ( code - DEFLATE_LITLEN_END - 1 );
if ( extra < 28 ) {
bits = ( extra / 4 );
if ( bits )
bits--;
deflate->extra_bits = bits;
deflate->dup_len =
deflate_litlen_base[extra];
} else {
deflate->extra_bits = 0;
deflate->dup_len = 258;
}
goto lzhuf_litlen_extra;
}
}
}
lzhuf_litlen_extra: {
int extra;
/* Extract extra bits */
extra = deflate_extract ( deflate, in, deflate->extra_bits );
if ( extra < 0 ) {
deflate->resume = &&lzhuf_litlen_extra;
return 0;
}
/* Update duplicate length */
deflate->dup_len += extra;
}
lzhuf_distance: {
int code;
unsigned int extra;
unsigned int bits;
/* Decode Huffman code */
code = deflate_decode ( deflate, in,
&deflate->distance_codelen );
if ( code < 0 ) {
deflate->resume = &&lzhuf_distance;
return 0;
}
/* Process extra bits */
extra = code;
bits = ( extra / 2 );
if ( bits )
bits--;
deflate->extra_bits = bits;
deflate->dup_distance = deflate_distance_base[extra];
}
lzhuf_distance_extra: {
int extra;
size_t dup_len;
size_t dup_distance;
/* Extract extra bits */
extra = deflate_extract ( deflate, in, deflate->extra_bits );
if ( extra < 0 ) {
deflate->resume = &&lzhuf_distance_extra;
return 0;
}
/* Update duplicate distance */
dup_distance = ( deflate->dup_distance + extra );
dup_len = deflate->dup_len;
DBGCP ( deflate, "DEFLATE %p duplicate length %zd distance "
"%zd\n", deflate, dup_len, dup_distance );
/* Sanity check */
if ( dup_distance > out->offset ) {
DBGC ( deflate, "DEFLATE %p bad distance %zd (max "
"%zd)\n", deflate, dup_distance, out->offset );
return -EINVAL;
}
/* Copy data, allowing for overlap */
deflate_copy ( out, out->data, ( out->offset - dup_distance ),
dup_len );
/* Process next literal/length symbol */
goto lzhuf_litlen;
}
block_done: {
DBGCP ( deflate, "DEFLATE %p end of block\n", deflate );
/* If this was not the final block, process next block header */
if ( ! ( deflate->header & ( 1 << DEFLATE_HEADER_BFINAL_BIT ) ))
goto block_header;
/* Otherwise, process footer (if any) */
switch ( deflate->format ) {
case DEFLATE_RAW: goto finished;
case DEFLATE_ZLIB: goto zlib_footer;
default: assert ( 0 );
}
}
zlib_footer: {
/* Discard any bits up to the next byte boundary */
deflate_discard_to_byte ( deflate );
}
zlib_adler32: {
int excess;
/* Accumulate the 32 bits of checksum. We don't check
* the value, stop processing immediately afterwards,
* and so don't have to worry about the nasty corner
* cases involved in calling deflate_extract() to
* obtain a full 32 bits.
*/
excess = deflate_accumulate ( deflate, in, ZLIB_ADLER32_BITS );
if ( excess < 0 ) {
deflate->resume = &&zlib_adler32;
return 0;
}
/* Finish processing */
goto finished;
}
finished: {
/* Mark as finished and terminate */
DBGCP ( deflate, "DEFLATE %p finished\n", deflate );
deflate->resume = NULL;
return 0;
}
}
Length pair.
Definition at line 155 of file deflate.h.
Referenced by ehci_ring_fill(), ehci_ring_remaining(), net80211_probe_step(), uhci_ring_fill(), uhci_ring_remaining(), usb_prefill(), usbio_endpoint_enqueue(), usbio_interrupt_callback(), usbkbd_fill(), usbkbd_iskey(), vmbus_send(), vmxnet3_transmit(), xenstore_recv(), xenstore_send(), and xhci_ring_remaining().
| struct deflate __attribute__ |
Offset of the first segment within the content.
Definition at line 259 of file deflate.h.
Referenced by acpi_currticks(), acpi_settings_fetch(), acpi_sx_zsdt(), alloc_iob_raw(), ar9003_hw_tx_iq_cal_post_proc(), ar9285_hw_pa_cal(), ar9300_read_otp(), ar9300_uncompress_block(), asn1_okx(), ath5k_cal_data_offset_2413(), ath5k_eeprom_init_modes(), ath5k_eeprom_read_ants(), ath5k_eeprom_read_ctl_info(), ath5k_eeprom_read_freq_list(), ath5k_eeprom_read_mac(), ath5k_eeprom_read_modes(), ath5k_eeprom_read_pcal_info_2413(), ath5k_eeprom_read_pcal_info_5111(), ath5k_eeprom_read_pcal_info_5112(), ath5k_eeprom_read_target_rate_pwr_info(), ath5k_eeprom_read_turbo_modes(), ath5k_hw_rfb_op(), ath9k_olc_get_pdadcs(), atl1e_setup_ring_resources(), axge_in_complete(), base64_decode(), bios_currticks(), bnx2_init_context(), bofm_locate_section(), bzimage_load_initrd(), bzimage_load_initrds(), cert_exec(), check_bios_interrupts(), clear_b0_fpga_memories(), cms_digest(), day_of_week(), dbg_hex_dump_da(), deflate_okx(), dhcpopt_fetch(), dhcpopt_store(), dhcpopt_update_used_len(), digest_exec(), dns_decode(), dns_label(), dns_list_okx(), dns_skip(), dns_skip_search(), efifb_glyph(), efifb_glyphs(), ehci_enqueue(), ehci_extended_capability(), exanic_poll_rx(), exanic_transmit(), fbcon_clear(), fbcon_draw(), fbcon_draw_cursor(), fbcon_picture_init(), fbcon_redraw(), fbcon_store(), fcpcmd_recv_rddata(), find_dhcp_option_with_encap(), find_smbios_entry(), find_smbios_structure(), fragment_reassemble(), goto_find_label(), history_entry(), history_move(), hunt_mcdi_copyout(), ibft_install(), ibft_string(), inject_corruption_nonzero(), ioremap_pages(), iscsi_rx_data_in(), iscsi_start_data_out(), iscsi_tx_data_out(), linda_post_send(), linda_verify_uc_ram(), load_cpu_fw(), md4_update(), md5_update(), mlx_pci_gw_check_capability_id(), multiboot_find_header(), multiboot_load_raw(), natsemi_create_ring(), natsemi_hwaddr_insane(), ndp_fetch(), ndp_register_settings(), ndp_rx_options(), nodnic_port_thin_init(), ntlm_challenge(), ntlm_data_okx(), pci_backup(), pci_restore(), pciea_bar_value(), pciea_offset(), peerdist_info_v1_block_offset(), pem_asn1(), pem_image_probe(), pem_marker(), phantom_clp_cmd(), phantom_clp_fetch(), phantom_clp_store(), phantom_crb_access_128m(), phantom_crb_access_2m(), phantom_crb_access_32m(), phantom_dmesg(), phantom_get_macaddr(), phantom_read_test_mem(), phantom_readl(), phantom_writel(), png_palette(), png_unfilter_pass(), pnm_data(), pxenv_file_api_check(), qib7322_post_send(), read_smbios_string(), rsdp_find_rsdt_range(), set_dhcp_option(), sha1_update(), sha256_update(), sha512_update(), tcpip_bind(), tftp_rx_data(), txnic_poll_cq(), txnic_refill_rq(), txnic_send(), vesafb_glyph(), virtio_pci_map_capability(), vmbus_xfer_page_iobufs(), vxge_hw_ring_replenish(), xenstore_recv(), xenstore_send(), xfer_seek(), xhci_extended_capability(), and xhci_supported_protocol().
1.7.6.1