diff options
| -rw-r--r-- | archival/lzop.c | 101 |
1 files changed, 49 insertions, 52 deletions
diff --git a/archival/lzop.c b/archival/lzop.c index 419e1e2..e724b9e 100644 --- a/archival/lzop.c +++ b/archival/lzop.c @@ -448,7 +448,7 @@ typedef struct header_t { uint16_t version_needed_to_extract_be16; uint8_t method; uint8_t level; - uint32_t flags32; /* be32 on disk, but we keep them in native order */ + uint32_t flags32; /* be32 on disk, but we keep this field in native order */ uint32_t mode_be32; uint32_t mtime_be32; uint32_t gmtdiff_be32; @@ -577,18 +577,18 @@ static void f_read(void* buf, int cnt) xread(0, buf, cnt); add_bytes_to_chksum(buf, cnt); } -static int f_read8(void) -{ - uint8_t v; - f_read(&v, 1); - return v; -} -static unsigned f_read16(void) -{ - uint16_t v; - f_read(&v, 2); - return ntohs(v); -} +//static int f_read8(void) +//{ +// uint8_t v; +// f_read(&v, 1); +// return v; +//} +//static unsigned f_read16(void) +//{ +// uint16_t v; +// f_read(&v, 2); +// return ntohs(v); +//} static uint32_t f_read32(void) { uint32_t v; @@ -928,66 +928,62 @@ static int read_header(header_t *h) { int l; uint32_t checksum; + /* As it stands now, only h->flags32 is used by our caller. + * Therefore we don't store many fields in h->FIELD. + */ unsigned h_version; - uint8_t h_method, h_level; + unsigned h_version_needed_to_extract; init_chksum(); - /* As it stands now, only h->flags32 is used by our caller. - * Therefore we don't store many fields in h->field. + /* We don't support versions < 0.94, since 0.94 + * came only 2 months after 0.90: + * 0.90 (10 Aug 1997): First public release of lzop + * 0.94 (15 Oct 1997): Header format change */ - h_version = f_read16(); - if (h_version < 0x0900) + + /* Read up to and including name length byte */ + f_read(&h->version_be16, ((char*)&h->len_and_name[1]) - ((char*)&h->version_be16)); + + h_version = htons(h->version_be16); + if (h_version < 0x0940) + return 3; + h_version_needed_to_extract = htons(h->version_needed_to_extract_be16); + if (h_version_needed_to_extract > LZOP_VERSION) + return 16; + if (h_version_needed_to_extract < 0x0940) return 3; - /* UNUSED h->lib_version_be16 = */ f_read16(); - if (h_version >= 0x0940) { - unsigned h_version_needed_to_extract = f_read16(); - if (h_version_needed_to_extract > LZOP_VERSION) - return 16; - if (h_version_needed_to_extract < 0x0900) /* first lzop version */ - return 3; - } - h_method = f_read8(); - if (h_method <= 0) + if (h->method <= 0) return 14; - h_level = 0; - if (h_version >= 0x0940) - h_level = f_read8(); /* former lzo_get_method(h): */ - if (h_method == M_LZO1X_1) { - if (h_level == 0) - h_level = 3; - } else if (h_method == M_LZO1X_1_15) { - if (h_level == 0) - h_level = 1; - } else if (h_method == M_LZO1X_999) { - if (h_level == 0) - h_level = 9; + if (h->method == M_LZO1X_1) { + if (h->level == 0) + h->level = 3; + } else if (h->method == M_LZO1X_1_15) { + if (h->level == 0) + h->level = 1; + } else if (h->method == M_LZO1X_999) { + if (h->level == 0) + h->level = 9; } else return -1; /* not a LZO method */ /* check compression level */ - if (h_level < 1 || h_level > 9) + if (h->level < 1 || h->level > 9) return 15; - h->flags32 = f_read32(); + h->flags32 = ntohl(h->flags32); if (h->flags32 & F_H_FILTER) return 16; /* filter not supported */ /* check reserved flags */ if (h->flags32 & F_RESERVED) return -13; - /* UNUSED h->mode = */ f_read32(); - /* UNUSED h->mtime = */ f_read32(); - if (h_version >= 0x0940) - /* UNUSED h->gmtdiff = */ f_read32(); - - l = f_read8(); - /* UNUSED h->len_and_name[0] = l; */ - /* UNUSED h->len_and_name[1+l] = 0; */ + l = h->len_and_name[0]; if (l > 0) - f_read(h->len_and_name+1, l); + /* UNUSED */ f_read(h->len_and_name+1, l); + /* UNUSED h->len_and_name[1+l] = 0; */ checksum = chksum_getresult(h->flags32); if (f_read32() != checksum) @@ -998,12 +994,13 @@ static int read_header(header_t *h) uint32_t extra_field_len; uint32_t extra_field_checksum; uint32_t k; + char dummy; /* note: the checksum also covers the length */ init_chksum(); extra_field_len = f_read32(); for (k = 0; k < extra_field_len; k++) - f_read8(); + f_read(&dummy, 1); checksum = chksum_getresult(h->flags32); extra_field_checksum = f_read32(); if (extra_field_checksum != checksum) |