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Diffstat (limited to 'package/heirloom-cpio/src/unzip.h')
| -rw-r--r-- | package/heirloom-cpio/src/unzip.h | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/package/heirloom-cpio/src/unzip.h b/package/heirloom-cpio/src/unzip.h new file mode 100644 index 000000000..d53f81024 --- /dev/null +++ b/package/heirloom-cpio/src/unzip.h @@ -0,0 +1,121 @@ +/* + * Changes by Gunnar Ritter, Freiburg i. Br., Germany, May 2003. + * + * Derived from unzip 5.40. + * + * Sccsid @(#)unzip.h 1.5 (gritter) 7/16/04 + */ + +#include <inttypes.h> + +#define Trace(a) + +#define MAX_BITS 13 +#define HSIZE (1 << MAX_BITS) +#define WSIZE 65536L /* at least 64K for enhanced deflate */ + +#define redirSlide G.area.Slide + +#define NEXTBYTE (--G.incnt >= 0 ? (int)(*G.inptr++) : readbyte(&G)) + +#define READBITS(nbits, zdest) { \ + if (nbits > G.bits_left) { \ + int temp; \ + G.zipeof = 1; \ + while (G.bits_left <= 8 * (int)(sizeof G.bitbuf - 1) && \ + (temp = NEXTBYTE) != EOF) { \ + G.bitbuf |= (uint32_t)temp << G.bits_left; \ + G.bits_left += 8; \ + G.zipeof = 0; \ + } \ + } \ + zdest = (int16_t)((uint16_t)G.bitbuf & mask_bits[nbits]); \ + G.bitbuf >>= nbits; \ + G.bits_left -= nbits; \ +} + +#undef FALSE +#undef TRUE +enum { + FALSE = 0, + TRUE = 1 +}; + +union work { + struct { + int16_t Parent[HSIZE]; + uint8_t value[HSIZE]; + uint8_t Stack[HSIZE]; + } shrink; + uint8_t Slide[WSIZE]; +}; + +#define OUTBUFSIZ 4096 + +struct globals { + union work area; + uint8_t inbuf[4096]; + long long zsize; + long long uzsize; + uint8_t *inptr; + const char *tgt; + struct huft *fixed_tl; + struct huft *fixed_td; + struct huft *fixed_tl64; + struct huft *fixed_td64; + struct huft *fixed_tl32; + struct huft *fixed_td32; + const uint16_t *cplens; + const uint8_t *cplext; + const uint8_t *cpdext; + long csize; + long ucsize; + uint8_t outbuf[OUTBUFSIZ]; + uint8_t *outptr; + uint32_t *crc; + uint32_t bitbuf; + uint32_t wp; + uint32_t bb; + uint32_t bk; + unsigned outcnt; + int tfd; + int doswap; + int incnt; + int bits_left; + int zipeof; + int fixed_bl; + int fixed_bd; + int fixed_bl64; + int fixed_bd64; + int fixed_bl32; + int fixed_bd32; + int status; +}; + +/* Huffman code lookup table entry--this entry is four bytes for machines + that have 16-bit pointers (e.g. PC's in the small or medium model). + Valid extra bits are 0..13. e == 15 is EOB (end of block), e == 16 + means that v is a literal, 16 < e < 32 means that v is a pointer to + the next table, which codes e - 16 bits, and lastly e == 99 indicates + an unused code. If a code with e == 99 is looked up, this implies an + error in the data. */ + +struct huft { + uint8_t e; /* number of extra bits or operation */ + uint8_t b; /* number of bits in this code or subcode */ + union { + uint16_t n; /* literal, length base, or distance base */ + struct huft *t; /* pointer to next level of table */ + } v; +}; + +extern const uint16_t mask_bits[]; + +extern void flush(struct globals *, const void *, size_t); +extern int readbyte(struct globals *); + +extern int huft_build(const unsigned *b, unsigned n, unsigned s, + const uint16_t *d, const uint8_t *e, + struct huft **t, int *m, + int bits, int nob, int eob); +extern void huft_free(struct huft *); |