#include "config.h"
#include "libbb.h"
-#ifdef CONFIG_FEATURE_UNCOMPRESS
-
/* uncompress for busybox -- (c) 2002 Robert Griebl
*
* based on the original compress42.c source
#include <string.h>
#include <unistd.h>
-#define IBUFSIZ 2048 /* Defailt input buffer size */
-#define OBUFSIZ 2048 /* Default output buffer size */
+/* Defailt input buffer size */
+#define IBUFSIZ 2048
- /* Defines for third byte of header */
-#define MAGIC_1 (char_type)'\037'/* First byte of compressed file */
-#define MAGIC_2 (char_type)'\235'/* Second byte of compressed file */
-#define BIT_MASK 0x1f /* Mask for 'number of compresssion bits' */
- /* Masks 0x20 and 0x40 are free. */
- /* I think 0x20 should mean that there is */
- /* a fourth header byte (for expansion). */
-#define BLOCK_MODE 0x80 /* Block compresssion if table is full and */
- /* compression rate is dropping flush tables */
+/* Default output buffer size */
+#define OBUFSIZ 2048
- /* the next two codes should not be changed lightly, as they must not */
- /* lie within the contiguous general code space. */
-#define FIRST 257 /* first free entry */
-#define CLEAR 256 /* table clear output code */
+/* Defines for third byte of header */
+#define MAGIC_1 (char_type)'\037' /* First byte of compressed file */
+#define MAGIC_2 (char_type)'\235' /* Second byte of compressed file */
+#define BIT_MASK 0x1f /* Mask for 'number of compresssion bits' */
+ /* Masks 0x20 and 0x40 are free. */
+ /* I think 0x20 should mean that there is */
+ /* a fourth header byte (for expansion). */
+#define BLOCK_MODE 0x80 /* Block compresssion if table is full and */
+ /* compression rate is dropping flush tables */
+ /* the next two codes should not be changed lightly, as they must not */
+ /* lie within the contiguous general code space. */
+#define FIRST 257 /* first free entry */
+#define CLEAR 256 /* table clear output code */
-#define INIT_BITS 9 /* initial number of bits/code */
+#define INIT_BITS 9 /* initial number of bits/code */
-/*
- * machine variants which require cc -Dmachine: pdp11, z8000, DOS
- */
+/* machine variants which require cc -Dmachine: pdp11, z8000, DOS */
#define FAST
-#define HBITS 17 /* 50% occupancy */
+#define HBITS 17 /* 50% occupancy */
#define HSIZE (1<<HBITS)
#define HMASK (HSIZE-1)
#define HPRIME 9941
#define BITS 16
#undef MAXSEG_64K
-
-typedef long int code_int;
-
-typedef long int count_int;
-typedef long int cmp_code_int;
-
-typedef unsigned char char_type;
-
#define MAXCODE(n) (1L << (n))
+/* Block compress mode -C compatible with 2.0 */
+int block_mode = BLOCK_MODE;
+
+/* user settable max # bits/code */
+int maxbits = BITS;
+/* Exitcode of compress (-1 no file compressed) */
+int exit_code = -1;
-int block_mode = BLOCK_MODE;/* Block compress mode -C compatible with 2.0*/
-int maxbits = BITS; /* user settable max # bits/code */
-int exit_code = -1; /* Exitcode of compress (-1 no file compressed) */
+/* Input buffer */
+unsigned char inbuf[IBUFSIZ + 64];
-char_type inbuf[IBUFSIZ+64]; /* Input buffer */
-char_type outbuf[OBUFSIZ+2048];/* Output buffer */
+/* Output buffer */
+unsigned char outbuf[OBUFSIZ + 2048];
-count_int htab[HSIZE];
-unsigned short codetab[HSIZE];
+long int htab[HSIZE];
+unsigned short codetab[HSIZE];
#define htabof(i) htab[i]
#define codetabof(i) codetab[i]
#define tab_prefixof(i) codetabof(i)
-#define tab_suffixof(i) ((char_type *)(htab))[i]
-#define de_stack ((char_type *)&(htab[HSIZE-1]))
+#define tab_suffixof(i) ((unsigned char *)(htab))[i]
+#define de_stack ((unsigned char *)&(htab[HSIZE-1]))
#define clear_htab() memset(htab, -1, sizeof(htab))
#define clear_tab_prefixof() memset(codetab, 0, 256);
extern int uncompress(int fd_in, int fd_out)
{
- char_type *stackp;
- code_int code;
- int finchar;
- code_int oldcode;
- code_int incode;
- int inbits;
- int posbits;
- int outpos;
- int insize;
- int bitmask;
- code_int free_ent;
- code_int maxcode;
- code_int maxmaxcode;
- int n_bits;
- int rsize = 0;
+ unsigned char *stackp;
+ long int code;
+ int finchar;
+ long int oldcode;
+ long int incode;
+ int inbits;
+ int posbits;
+ int outpos;
+ int insize;
+ int bitmask;
+ long int free_ent;
+ long int maxcode;
+ long int maxmaxcode;
+ int n_bits;
+ int rsize = 0;
insize = 0;
- inbuf [0] = xread_char(fd_in);
+ inbuf[0] = bb_xread_char(fd_in);
maxbits = inbuf[0] & BIT_MASK;
block_mode = inbuf[0] & BLOCK_MODE;
maxmaxcode = MAXCODE(maxbits);
- if (maxbits > BITS)
- {
- fprintf(stderr, "compressed with %d bits, can only handle %d bits\n", maxbits, BITS);
+ if (maxbits > BITS) {
+ bb_error_msg("compressed with %d bits, can only handle %d bits", maxbits,
+ BITS);
return -1;
}
- //fprintf(stderr, "Bits: %d, block_mode: %d\n", maxbits, block_mode );
-
- maxcode = MAXCODE(n_bits = INIT_BITS)-1;
- bitmask = (1<<n_bits)-1;
+ maxcode = MAXCODE(n_bits = INIT_BITS) - 1;
+ bitmask = (1 << n_bits) - 1;
oldcode = -1;
finchar = 0;
outpos = 0;
- posbits = 0<<3;
+ posbits = 0 << 3;
- free_ent = ((block_mode) ? FIRST : 256);
+ free_ent = ((block_mode) ? FIRST : 256);
- clear_tab_prefixof(); /* As above, initialize the first
- 256 entries in the table. */
+ /* As above, initialize the first 256 entries in the table. */
+ clear_tab_prefixof();
- for (code = 255 ; code >= 0 ; --code)
- tab_suffixof(code) = (char_type)code;
+ for (code = 255; code >= 0; --code) {
+ tab_suffixof(code) = (unsigned char) code;
+ }
- do
- {
-resetbuf: ;
+ do {
+ resetbuf:;
{
- int i;
- int e;
- int o;
+ int i;
+ int e;
+ int o;
- e = insize-(o = (posbits>>3));
+ e = insize - (o = (posbits >> 3));
- for (i = 0 ; i < e ; ++i)
- inbuf[i] = inbuf[i+o];
+ for (i = 0; i < e; ++i)
+ inbuf[i] = inbuf[i + o];
insize = e;
posbits = 0;
}
- if (insize < (int) sizeof(inbuf)-IBUFSIZ)
- {
- rsize = read(fd_in, inbuf+insize, IBUFSIZ);
+ if (insize < (int) sizeof(inbuf) - IBUFSIZ) {
+ rsize = safe_read(fd_in, inbuf + insize, IBUFSIZ);
insize += rsize;
}
- inbits = ((rsize > 0) ? (insize - insize%n_bits)<<3 :
- (insize<<3)-(n_bits-1));
-
- while (inbits > posbits)
- {
- if (free_ent > maxcode)
- {
- posbits = ((posbits-1) + ((n_bits<<3) -
- (posbits-1+(n_bits<<3))%(n_bits<<3)));
+ inbits = ((rsize > 0) ? (insize - insize % n_bits) << 3 :
+ (insize << 3) - (n_bits - 1));
+ while (inbits > posbits) {
+ if (free_ent > maxcode) {
+ posbits =
+ ((posbits - 1) +
+ ((n_bits << 3) -
+ (posbits - 1 + (n_bits << 3)) % (n_bits << 3)));
++n_bits;
- if (n_bits == maxbits)
+ if (n_bits == maxbits) {
maxcode = maxmaxcode;
- else
- maxcode = MAXCODE(n_bits)-1;
-
- bitmask = (1<<n_bits)-1;
+ } else {
+ maxcode = MAXCODE(n_bits) - 1;
+ }
+ bitmask = (1 << n_bits) - 1;
goto resetbuf;
}
+ {
+ unsigned char *p = &inbuf[posbits >> 3];
-
- {
- char_type *p = &inbuf[posbits>>3];
- code = ((((long)(p[0]))|((long)(p[1])<<8)|((long)(p[2])<<16))>>(posbits&0x7))&bitmask;
+ code =
+ ((((long) (p[0])) | ((long) (p[1]) << 8) |
+ ((long) (p[2]) << 16)) >> (posbits & 0x7)) & bitmask;
}
posbits += n_bits;
-
- if (oldcode == -1)
- {
- outbuf[outpos++] = (char_type)(finchar = (int)(oldcode = code));
+
+ if (oldcode == -1) {
+ outbuf[outpos++] = (unsigned char) (finchar =
+ (int) (oldcode = code));
continue;
}
- if (code == CLEAR && block_mode)
- {
+ if (code == CLEAR && block_mode) {
clear_tab_prefixof();
- free_ent = FIRST - 1;
- posbits = ((posbits-1) + ((n_bits<<3) -
- (posbits-1+(n_bits<<3))%(n_bits<<3)));
- maxcode = MAXCODE(n_bits = INIT_BITS)-1;
- bitmask = (1<<n_bits)-1;
+ free_ent = FIRST - 1;
+ posbits =
+ ((posbits - 1) +
+ ((n_bits << 3) -
+ (posbits - 1 + (n_bits << 3)) % (n_bits << 3)));
+ maxcode = MAXCODE(n_bits = INIT_BITS) - 1;
+ bitmask = (1 << n_bits) - 1;
goto resetbuf;
}
incode = code;
- stackp = de_stack;
+ stackp = de_stack;
- if (code >= free_ent) /* Special case for KwKwK string. */
- {
- if (code > free_ent)
- {
- char_type *p;
+ /* Special case for KwKwK string. */
+ if (code >= free_ent) {
+ if (code > free_ent) {
+ unsigned char *p;
posbits -= n_bits;
- p = &inbuf[posbits>>3];
+ p = &inbuf[posbits >> 3];
- fprintf(stderr, "insize:%d posbits:%d inbuf:%02X %02X %02X %02X %02X (%d)\n", insize, posbits,
- p[-1],p[0],p[1],p[2],p[3], (posbits&07));
- fprintf(stderr, "uncompress: corrupt input\n");
+ bb_error_msg
+ ("insize:%d posbits:%d inbuf:%02X %02X %02X %02X %02X (%d)",
+ insize, posbits, p[-1], p[0], p[1], p[2], p[3],
+ (posbits & 07));
+ bb_error_msg("uncompress: corrupt input");
return -1;
}
- *--stackp = (char_type)finchar;
- code = oldcode;
+ *--stackp = (unsigned char) finchar;
+ code = oldcode;
}
- while ((cmp_code_int)code >= (cmp_code_int)256)
- { /* Generate output characters in reverse order */
- *--stackp = tab_suffixof(code);
- code = tab_prefixof(code);
+ /* Generate output characters in reverse order */
+ while ((long int) code >= (long int) 256) {
+ *--stackp = tab_suffixof(code);
+ code = tab_prefixof(code);
}
- *--stackp = (char_type)(finchar = tab_suffixof(code));
-
- /* And put them out in forward order */
+ *--stackp = (unsigned char) (finchar = tab_suffixof(code));
+ /* And put them out in forward order */
{
- int i;
+ int i;
- if (outpos+(i = (de_stack-stackp)) >= OBUFSIZ)
- {
- do
- {
- if (i > OBUFSIZ-outpos) i = OBUFSIZ-outpos;
+ if (outpos + (i = (de_stack - stackp)) >= OBUFSIZ) {
+ do {
+ if (i > OBUFSIZ - outpos) {
+ i = OBUFSIZ - outpos;
+ }
- if (i > 0)
- {
- memcpy(outbuf+outpos, stackp, i);
+ if (i > 0) {
+ memcpy(outbuf + outpos, stackp, i);
outpos += i;
}
- if (outpos >= OBUFSIZ)
- {
+ if (outpos >= OBUFSIZ) {
write(fd_out, outbuf, outpos);
outpos = 0;
}
- stackp+= i;
- }
- while ((i = (de_stack-stackp)) > 0);
- }
- else
- {
- memcpy(outbuf+outpos, stackp, i);
+ stackp += i;
+ } while ((i = (de_stack - stackp)) > 0);
+ } else {
+ memcpy(outbuf + outpos, stackp, i);
outpos += i;
}
}
- if ((code = free_ent) < maxmaxcode) /* Generate the new entry. */
- {
- tab_prefixof(code) = (unsigned short)oldcode;
- tab_suffixof(code) = (char_type)finchar;
- free_ent = code+1;
- }
+ /* Generate the new entry. */
+ if ((code = free_ent) < maxmaxcode) {
+ tab_prefixof(code) = (unsigned short) oldcode;
+ tab_suffixof(code) = (unsigned char) finchar;
+ free_ent = code + 1;
+ }
- oldcode = incode; /* Remember previous code. */
+ /* Remember previous code. */
+ oldcode = incode;
}
- }
- while (rsize > 0);
+ } while (rsize > 0);
if (outpos > 0) {
write(fd_out, outbuf, outpos);
return 0;
}
-
-
-#endif
projects / oweals / busybox.git / blobdiff