start_bunzip

Name:Allocate the structure, read file header. If in_fd ==-1, inbuf must containa complete bunzip file (len bytes long). If in_fd!=-1, inbuf and len areignored, and data is read from file handle into temporary buffer.

Proto:static int __attribute__((__section__(".init.text"))) __attribute__((__cold__))start_bunzip(struct bunzip_data **bdp, void *inbuf, long len, long (*fill)(void *, unsigned long ))

Type:int

Parameter:

Type	Parameter	Name
struct bunzip_data **	bdp
void *	inbuf
long	len
long (*	fill

634

BZh0 = ('B' << 24) + ('Z' << 16) + ('h' << 8) + '0'

639

i = sizeof(structbunzip_data)

642

bd = bdp = Use defines rather than static inline in order to avoid spurious* warnings when not needed (indeed large_malloc / large_free are not* needed by inflate (i)

643

If Not bd Then Return RETVAL_OUT_OF_MEMORY

645

memset(bd, 0, sizeof(structbunzip_data))

647

,*outbuf = inbuf

648

inbufCount = len

649

If (fill != NULL) Then fill = fill

651

Else fill = nofill

655

When i < 256 cycle

656

c = i << 24

657

When j cycle c = If c & 0x80000000 Then c << 1 ^ CRC32_POLY_BE Else c << 1

659

The CRC values stored in the block header and calculated from thedata [i] = c

663

i = Return the next nnn bits of input. All reads from the compressed inputare done through this function. All reads are big endian

664

If i - BZh0 - 1 >= 9 Then Return RETVAL_NOT_BZIP_DATA

669

Intermediate buffer and its size (in bytes) = 100000 * (i - BZh0)

671

Intermediate buffer and its size (in bytes) = large_malloc(Intermediate buffer and its size (in bytes) * sizeof(int))

672

If Not Intermediate buffer and its size (in bytes) Then Return RETVAL_OUT_OF_MEMORY

674

Return Status return values

**Caller**
Name	Describe
bunzip2	Example usage: decompress src_fd to dst_fd. (Stops at end of bzip2 data,not end of file.)

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