gzip: new GZIP_BIG_MEM option

[platform/upstream/busybox.git] / archival / rpm2cpio.c

diff --git a/archival/rpm2cpio.c b/archival/rpm2cpio.c
index 566a9f2..ff4a0d1 100644 (file)
--- a/archival/rpm2cpio.c
+++ b/archival/rpm2cpio.c
@@ -4,38 +4,24 @@
  *
  * Copyright (C) 2001 by Laurence Anderson
  *
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  */
+
+//usage:#define rpm2cpio_trivial_usage
+//usage:       "package.rpm"
+//usage:#define rpm2cpio_full_usage "\n\n"
+//usage:       "Output a cpio archive of the rpm file"
+
 #include "libbb.h"
-#include "unarchive.h"
-
-#define RPM_MAGIC            0xedabeedb
-#define RPM_MAGIC_STR        "\355\253\356\333"
-
-struct rpm_lead {
-       uint32_t magic;
-       uint8_t major, minor;
-       uint16_t type;
-       uint16_t archnum;
-       char name[66];
-       uint16_t osnum;
-       uint16_t signature_type;
-       char reserved[16];
-};
-
-#define RPM_HEADER_VERnMAGIC 0x8eade801
-#define RPM_HEADER_MAGIC_STR "\216\255\350"
-
-struct rpm_header {
-       uint32_t magic_and_ver; /* 3 byte magic: 0x8e 0xad 0xe8; 1 byte version */
-       uint32_t reserved; /* 4 bytes reserved */
-       uint32_t entries; /* Number of entries in header (4 bytes) */
-       uint32_t size; /* Size of store (4 bytes) */
-};
-
-static off_t skip_header(int rpm_fd)
+#include "archive.h"
+#include "rpm.h"
+
+enum { rpm_fd = STDIN_FILENO };
+
+static unsigned skip_header(void)
 {
        struct rpm_header header;
+       unsigned len;
 
        xread(rpm_fd, &header, sizeof(header));
 //     if (strncmp((char *) &header.magic, RPM_HEADER_MAGIC_STR, 3) != 0) {
@@ -44,14 +30,16 @@ static off_t skip_header(int rpm_fd)
 //     if (header.version != 1) {
 //             bb_error_msg_and_die("unsupported RPM header version");
 //     }
-       if (header.magic_and_ver != htonl(RPM_HEADER_VERnMAGIC)) {
+       if (header.magic_and_ver != htonl(RPM_HEADER_MAGICnVER)) {
                bb_error_msg_and_die("invalid RPM header magic or unsupported version");
-               // ": %x != %x", header.magic_and_ver, htonl(RPM_HEADER_VERnMAGIC));
+               // ": %x != %x", header.magic_and_ver, htonl(RPM_HEADER_MAGICnVER));
        }
-       /* Seek past index entries */
-       lseek(rpm_fd, 16 * ntohl(header.entries), SEEK_CUR);
-       /* Seek past store */
-       return lseek(rpm_fd, ntohl(header.size), SEEK_CUR);
+
+       /* Seek past index entries, and past store */
+       len = 16 * ntohl(header.entries) + ntohl(header.size);
+       seek_by_jump(rpm_fd, len);
+
+       return sizeof(header) + len;
 }
 
 /* No getopt required */
@@ -59,46 +47,69 @@ int rpm2cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int rpm2cpio_main(int argc UNUSED_PARAM, char **argv)
 {
        struct rpm_lead lead;
-       int rpm_fd;
-       off_t pos;
-       unsigned char magic[2];
-       IF_DESKTOP(long long) int FAST_FUNC (*unpack)(int src_fd, int dst_fd);
-
-       if (!argv[1]) {
-               rpm_fd = STDIN_FILENO;
-       } else {
-               rpm_fd = xopen(argv[1], O_RDONLY);
+       unsigned pos;
+
+       if (argv[1]) {
+               xmove_fd(xopen(argv[1], O_RDONLY), rpm_fd);
        }
        xread(rpm_fd, &lead, sizeof(lead));
 
        /* Just check the magic, the rest is irrelevant */
-       if (lead.magic != htonl(RPM_MAGIC)) {
+       if (lead.magic != htonl(RPM_LEAD_MAGIC)) {
                bb_error_msg_and_die("invalid RPM magic");
        }
 
        /* Skip the signature header, align to 8 bytes */
-       pos = skip_header(rpm_fd);
-       lseek(rpm_fd, (8 - (unsigned)pos) & 7, SEEK_CUR);
+       pos = skip_header();
+       seek_by_jump(rpm_fd, (-(int)pos) & 7);
 
        /* Skip the main header */
-       skip_header(rpm_fd);
+       skip_header();
 
-       xread(rpm_fd, &magic, 2);
-       unpack = unpack_gz_stream;
-       if (magic[0] != 0x1f || magic[1] != 0x8b) {
-               if (!ENABLE_FEATURE_SEAMLESS_BZ2
-                || magic[0] != 'B' || magic[1] != 'Z'
+#if 0
+       /* This works, but doesn't report uncompress errors (they happen in child) */
+       setup_unzip_on_fd(rpm_fd /*fail_if_not_detected: 1*/);
+       if (bb_copyfd_eof(rpm_fd, STDOUT_FILENO) < 0)
+               bb_error_msg_and_die("error unpacking");
+#else
+       /* BLOAT */
+       {
+               union {
+                       uint8_t b[4];
+                       uint16_t b16[2];
+                       uint32_t b32[1];
+               } magic;
+               IF_DESKTOP(long long) int FAST_FUNC (*unpack)(int src_fd, int dst_fd);
+
+               xread(rpm_fd, magic.b16, sizeof(magic.b16[0]));
+               if (magic.b16[0] == GZIP_MAGIC) {
+                       unpack = unpack_gz_stream;
+               } else
+               if (ENABLE_FEATURE_SEAMLESS_BZ2
+                && magic.b16[0] == BZIP2_MAGIC
+               ) {
+                       unpack = unpack_bz2_stream;
+               } else
+               if (ENABLE_FEATURE_SEAMLESS_XZ
+                && magic.b16[0] == XZ_MAGIC1
                ) {
-                       bb_error_msg_and_die("invalid gzip"
+                       xread(rpm_fd, magic.b32, sizeof(magic.b32[0]));
+                       if (magic.b32[0] != XZ_MAGIC2)
+                               goto no_magic;
+                       /* unpack_xz_stream wants fd at position 6, no need to seek */
+                       //xlseek(rpm_fd, -6, SEEK_CUR);
+                       unpack = unpack_xz_stream;
+               } else {
+ no_magic:
+                       bb_error_msg_and_die("no gzip"
                                        IF_FEATURE_SEAMLESS_BZ2("/bzip2")
+                                       IF_FEATURE_SEAMLESS_XZ("/xz")
                                        " magic");
                }
-               unpack = unpack_bz2_stream;
-       }
-
-       if (unpack(rpm_fd, STDOUT_FILENO) < 0) {
-               bb_error_msg_and_die("error unpacking");
+               if (unpack(rpm_fd, STDOUT_FILENO) < 0)
+                       bb_error_msg_and_die("error unpacking");
        }
+#endif
 
        if (ENABLE_FEATURE_CLEAN_UP) {
                close(rpm_fd);