diff options
author | Waldemar Brodkorb <wbx@openadk.org> | 2010-07-29 15:25:12 +0200 |
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committer | Waldemar Brodkorb <wbx@openadk.org> | 2010-07-29 15:25:12 +0200 |
commit | fd6481d82ff407139157e53df28563d40bb3ad3b (patch) | |
tree | ed2ae9e08c31d1eed424793272a60c25cdec6c00 /tools/cpio/src/expand.c | |
parent | 14804005d5b33beb6f52d4a72034acb00c00eb90 (diff) |
add a cpio implementation to tools directory
cpio utility is a mess in point of portability.
For example NetBSD cpio implementation does not support
userid and groupid changes for the archive. This
feature is required for initramfs filesystem targets.
This cpio is from the Heirloom project.
Fix needed rebuild of tools, when changing targets.
Diffstat (limited to 'tools/cpio/src/expand.c')
-rw-r--r-- | tools/cpio/src/expand.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/tools/cpio/src/expand.c b/tools/cpio/src/expand.c new file mode 100644 index 000000000..5a5233f3e --- /dev/null +++ b/tools/cpio/src/expand.c @@ -0,0 +1,193 @@ +/* + * cpio - copy file archives in and out + * + * Gunnar Ritter, Freiburg i. Br., Germany, April 2003. + */ +/* + * Copyright (c) 2003 Gunnar Ritter + * + * This software is provided 'as-is', without any express or implied + * warranty. In no event will the authors be held liable for any damages + * arising from the use of this software. + * + * Permission is granted to anyone to use this software for any purpose, + * including commercial applications, and to alter it and redistribute + * it freely, subject to the following restrictions: + * + * 1. The origin of this software must not be misrepresented; you must not + * claim that you wrote the original software. If you use this software + * in a product, an acknowledgment in the product documentation would be + * appreciated but is not required. + * + * 2. Altered source versions must be plainly marked as such, and must not be + * misrepresented as being the original software. + * + * 3. This notice may not be removed or altered from any source distribution. + */ + +/* Sccsid @(#)expand.c 1.6 (gritter) 12/15/03 */ + +#include <sys/types.h> +#include <sys/stat.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include "cpio.h" + +#define DLE 144 + +static void +zexread(char *data, size_t size, int doswap) +{ + if (bread(data, size) != size) + unexeoa(); + if (doswap) + swap(data, size, bflag || sflag, bflag || Sflag); +} + +#define nextbyte() ( \ + ipos >= sizeof ibuf && isize > 0 ? ( \ + zexread(ibuf, isize>sizeof ibuf?sizeof ibuf:isize, doswap), \ + ipos = 0 \ + ) : 0, \ + isize--, \ + ibuf[ipos++] & 0377 \ +) + +#define nextbit() ( \ + ibit = ibit >= 7 ? (ibyte = nextbyte(), 0) : ibit + 1, \ + isize < 0 ? (ieof = 1, -1) : (ibyte & (1<<ibit)) >> ibit \ +) + +#define sixbits(n) { \ + int t; \ + (n) = 0; \ + for (t = 0; t < 6; t++) \ + (n) |= nextbit() << t; \ +} + +#define eightbits(n) { \ + int t; \ + (n) = 0; \ + for (t = 0; t < 8; t++) \ + (n) |= nextbit() << t; \ +} + +static void +zexwrite(int *tfd, char *data, size_t size, uint32_t *crc, int *val, + const char *tgt, long long *nsize) +{ + if (size) { + if (size > *nsize) + size = *nsize; + if (*tfd >= 0 && write(*tfd, data, size) != size) { + emsg(3, "Cannot write \"%s\"", tgt); + *tfd = -1; + *val = -1; + } + *crc = zipcrc(*crc, (unsigned char *)data, size); + *nsize -= size; + } +} + +#define wadd(c) ( \ + wpos >= sizeof wbuf ? ( \ + zexwrite(&tfd, wbuf, sizeof wbuf, crc, &val, tgt, &nsize), \ + wpos = 0 \ + ) : 0, \ + wsize++, \ + wbuf[wpos++] = (c) \ +) + +#define zex_L(x) ( \ + f->f_cmethod == C_REDUCED1 ? (x) & 0177 : \ + f->f_cmethod == C_REDUCED2 ? (x) & 077 : \ + f->f_cmethod == C_REDUCED3 ? (x) & 037 : \ + /* f->f_cmethod == C_REDUCED4 */ (x) & 017 \ +) + +#define zex_F(x) ( \ + f->f_cmethod == C_REDUCED1 ? (x) == 0177 ? 2 : 3 : \ + f->f_cmethod == C_REDUCED2 ? (x) == 077 ? 2 : 3 : \ + f->f_cmethod == C_REDUCED3 ? (x) == 037 ? 2 : 3 : \ + /* f->f_cmethod == C_REDUCED4 */ (x) == 017 ? 2 : 3 \ +) + +#define zex_D(x, y) ( \ + f->f_cmethod == C_REDUCED1 ? (((x)&0200)>>7) * 0400 + (y) + 1 : \ + f->f_cmethod == C_REDUCED2 ? (((x)&0300)>>6) * 0400 + (y) + 1 : \ + f->f_cmethod == C_REDUCED3 ? (((x)&0340)>>5) * 0400 + (y) + 1 : \ + /* f->f_cmethod == C_REDUCED4 */ (((x)&0360)>>4) * 0400 + (y) + 1 \ +) + +int +zipexpand(struct file *f, const char *tgt, int tfd, int doswap, uint32_t *crc) +{ + char fset[256][33]; + char ibuf[4096], ibyte = 0, wbuf[8192]; + long ipos = sizeof ibuf, wpos = 0, isize = f->f_csize, wsize = 0; + int val = 0, ieof = 0; + int c = 0, i, j, k, n, ibit = 7, lastc, state, v = 0, len = 0; + long long nsize = f->f_st.st_size; + + *crc = 0; + memset(fset, 0, sizeof fset); + for (j = 255; j >= 0; j--) { + sixbits(n); + for (i = 0; i < n; i++) { + eightbits(fset[j][i]); + } + fset[j][32] = n<1?0:n<3?1:n<5?2:n<9?3:n<17?4:n<37?5:n<65?6:7; + } + lastc = 0; + state = 0; + while (ieof == 0) { + if (fset[lastc][32] == 0) { + eightbits(c); + } else { + if (nextbit() != 0) { + eightbits(c); + } else { + i = 0; + for (k = 0; k < fset[lastc][32]; k++) + i |= nextbit() << k; + c = fset[lastc][i] & 0377; + } + } + lastc = c; + switch (state) { + case 0: + if (c != DLE) + wadd(c); + else + state = 1; + break; + case 1: + if (c != 0) { + v = c; + len = zex_L(v); + state = zex_F(len); + } else { + wadd(DLE); + state = 0; + } + break; + case 2: + len += c; + state = 3; + break; + case 3: + n = wsize - zex_D(v, c); + for (i = 0; i < len + 3; i++) { + c = n+i >= 0 ? wbuf[n+i&sizeof wbuf-1]&0377 : 0; + wadd(c); + } + state = 0; + } + } + zexwrite(&tfd, wbuf, wpos, crc, &val, tgt, &nsize); + while (isize >= 0) + nextbyte(); + return val; +} |