static int __init alloc_workspace(void) { lzo_mem = vmalloc(LZO1X_MEM_COMPRESS); lzo_compress_buf = vmalloc(lzo1x_worst_compress(PAGE_SIZE)); if (!lzo_mem || !lzo_compress_buf) { free_workspace(); return -ENOMEM; } return 0; }
static int __init alloc_workspace(void) { lzo_mem = vmalloc(LZO1X_MEM_COMPRESS); lzo_compress_buf = vmalloc(lzo1x_worst_compress(PAGE_SIZE)); if (!lzo_mem || !lzo_compress_buf) { printk(KERN_WARNING "Failed to allocate lzo deflate workspace\n"); free_workspace(); return -ENOMEM; } return 0; }
static int decompress_lzo(unsigned char *inbuf, char *outbuf, u64 compress_len, u64 *decompress_len) { size_t new_len; size_t in_len; size_t out_len = 0; size_t tot_len; size_t tot_in; int ret; ret = lzo_init(); if (ret != LZO_E_OK) { fprintf(stderr, "lzo init returned %d\n", ret); return -1; } tot_len = read_compress_length(inbuf); inbuf += LZO_LEN; tot_in = LZO_LEN; while (tot_in < tot_len) { in_len = read_compress_length(inbuf); if ((tot_in + LZO_LEN + in_len) > tot_len) { fprintf(stderr, "bad compress length %lu\n", (unsigned long)in_len); return -1; } inbuf += LZO_LEN; tot_in += LZO_LEN; new_len = lzo1x_worst_compress(PAGE_CACHE_SIZE); ret = lzo1x_decompress_safe((const unsigned char *)inbuf, in_len, (unsigned char *)outbuf, (void *)&new_len, NULL); if (ret != LZO_E_OK) { fprintf(stderr, "failed to inflate: %d\n", ret); return -1; } out_len += new_len; outbuf += new_len; inbuf += in_len; tot_in += in_len; } *decompress_len = out_len; return 0; }
static void allocate_lzo(void) { big_oops_buf_sz = lzo1x_worst_compress(psinfo->bufsize); big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL); if (big_oops_buf) { workspace = kmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL); if (!workspace) { pr_err("No memory for compression workspace; skipping compression\n"); kfree(big_oops_buf); big_oops_buf = NULL; } } else { pr_err("No memory for uncompressed data; skipping compression\n"); workspace = NULL; } }
STATIC inline int INIT unlzo(u8 *input, int in_len, int (*fill) (void *, unsigned int), int (*flush) (void *, unsigned int), u8 *output, int *posp, void (*error_fn) (char *x)) { u8 skip = 0, r = 0; u32 src_len, dst_len; size_t tmp; u8 *in_buf, *in_buf_save, *out_buf; int ret = -1; set_error_fn(error_fn); if (output) { out_buf = output; } else if (!flush) { error("NULL output pointer and no flush function provided"); goto exit; } else { out_buf = malloc(LZO_BLOCK_SIZE); if (!out_buf) { error("Could not allocate output buffer"); goto exit; } } if (input && fill) { error("Both input pointer and fill function provided, don't know what to do"); goto exit_1; } else if (input) { in_buf = input; } else if (!fill || !posp) { error("NULL input pointer and missing position pointer or fill function"); goto exit_1; } else { in_buf = malloc(lzo1x_worst_compress(LZO_BLOCK_SIZE)); if (!in_buf) { error("Could not allocate input buffer"); goto exit_1; } } in_buf_save = in_buf; if (posp) *posp = 0; if (fill) fill(in_buf, lzo1x_worst_compress(LZO_BLOCK_SIZE)); if (!parse_header(input, &skip)) { error("invalid header"); goto exit_2; } in_buf += skip; if (posp) *posp = skip; for (;;) { /* read uncompressed block size */ dst_len = get_unaligned_be32(in_buf); in_buf += 4; /* exit if last block */ if (dst_len == 0) { if (posp) *posp += 4; break; } if (dst_len > LZO_BLOCK_SIZE) { error("dest len longer than block size"); goto exit_2; } /* read compressed block size, and skip block checksum info */ src_len = get_unaligned_be32(in_buf); in_buf += 8; if (src_len <= 0 || src_len > dst_len) { error("file corrupted"); goto exit_2; } /* decompress */ tmp = dst_len; /* When the input data is not compressed at all, * lzo1x_decompress_safe will fail, so call memcpy() * instead */ if (unlikely(dst_len == src_len)) memcpy(out_buf, in_buf, src_len); else { r = lzo1x_decompress_safe((u8 *) in_buf, src_len, out_buf, &tmp); if (r != LZO_E_OK || dst_len != tmp) { error("Compressed data violation"); goto exit_2; } } if (flush) flush(out_buf, dst_len); if (output) out_buf += dst_len; if (posp) *posp += src_len + 12; if (fill) { in_buf = in_buf_save; fill(in_buf, lzo1x_worst_compress(LZO_BLOCK_SIZE)); } else in_buf += src_len; } ret = 0; exit_2: if (!input) free(in_buf); exit_1: if (!output) free(out_buf); exit: return ret; }
static int zbufsize_lzo(size_t size) { return lzo1x_worst_compress(size); }
static int decompress_lzo(unsigned char *inbuf, char *outbuf, u64 compress_len, u64 *decompress_len) { size_t new_len; size_t in_len; size_t out_len = 0; size_t tot_len; size_t tot_in; int ret; ret = lzo_init(); if (ret != LZO_E_OK) { fprintf(stderr, "lzo init returned %d\n", ret); return -1; } tot_len = read_compress_length(inbuf); inbuf += LZO_LEN; tot_in = LZO_LEN; while (tot_in < tot_len) { size_t mod_page; size_t rem_page; in_len = read_compress_length(inbuf); if ((tot_in + LZO_LEN + in_len) > tot_len) { fprintf(stderr, "bad compress length %lu\n", (unsigned long)in_len); return -1; } inbuf += LZO_LEN; tot_in += LZO_LEN; new_len = lzo1x_worst_compress(PAGE_CACHE_SIZE); ret = lzo1x_decompress_safe((const unsigned char *)inbuf, in_len, (unsigned char *)outbuf, (void *)&new_len, NULL); if (ret != LZO_E_OK) { fprintf(stderr, "failed to inflate: %d\n", ret); return -1; } out_len += new_len; outbuf += new_len; inbuf += in_len; tot_in += in_len; /* * If the 4 byte header does not fit to the rest of the page we * have to move to the next one, unless we read some garbage */ mod_page = tot_in % PAGE_CACHE_SIZE; rem_page = PAGE_CACHE_SIZE - mod_page; if (rem_page < LZO_LEN) { inbuf += rem_page; tot_in += rem_page; } } *decompress_len = out_len; return 0; }
int decompress_unlzo(u8 *input, int in_len, int (*fill) (void *, unsigned int), int (*flush) (void *, unsigned int), u8 *output, int *posp, void (*error) (char *x)) { u8 r = 0; int skip = 0; u32 src_len, dst_len; size_t tmp; u8 *in_buf, *in_buf_save, *out_buf; int ret = -1; if (output) { out_buf = output; } else if (!flush) { error("NULL output pointer and no flush function provided"); goto exit; } else { out_buf = malloc(LZO_BLOCK_SIZE); if (!out_buf) { error("Could not allocate output buffer"); goto exit; } } if (input && fill) { error("Both input pointer and fill function provided, don't know what to do"); goto exit_1; } else if (input) { in_buf = input; } else if (!fill) { error("NULL input pointer and missing fill function"); goto exit_1; } else { in_buf = malloc(lzo1x_worst_compress(LZO_BLOCK_SIZE)); if (!in_buf) { error("Could not allocate input buffer"); goto exit_1; } } in_buf_save = in_buf; if (posp) *posp = 0; if (fill) { /* * Start from in_buf + HEADER_SIZE_MAX to make it possible * to use memcpy() to copy the unused data to the beginning * of the buffer. This way memmove() isn't needed which * is missing from pre-boot environments of most archs. */ in_buf += HEADER_SIZE_MAX; in_len = fill(in_buf, HEADER_SIZE_MAX); } if (!parse_header(in_buf, &skip, in_len)) { error("invalid header"); goto exit_2; } in_buf += skip; in_len -= skip; if (fill) { /* Move the unused data to the beginning of the buffer. */ memcpy(in_buf_save, in_buf, in_len); in_buf = in_buf_save; } if (posp) *posp = skip; for (;;) { /* read uncompressed block size */ if (fill && in_len < 4) { skip = fill(in_buf + in_len, 4 - in_len); if (skip > 0) in_len += skip; } if (in_len < 4) { error("file corrupted"); goto exit_2; } dst_len = get_unaligned_be32(in_buf); in_buf += 4; in_len -= 4; /* exit if last block */ if (dst_len == 0) { if (posp) *posp += 4; break; } if (dst_len > LZO_BLOCK_SIZE) { error("dest len longer than block size"); goto exit_2; } /* read compressed block size, and skip block checksum info */ if (fill && in_len < 8) { skip = fill(in_buf + in_len, 8 - in_len); if (skip > 0) in_len += skip; } if (in_len < 8) { error("file corrupted"); goto exit_2; } src_len = get_unaligned_be32(in_buf); in_buf += 8; in_len -= 8; if (src_len <= 0 || src_len > dst_len) { error("file corrupted"); goto exit_2; } /* decompress */ if (fill && in_len < src_len) { skip = fill(in_buf + in_len, src_len - in_len); if (skip > 0) in_len += skip; } if (in_len < src_len) { error("file corrupted"); goto exit_2; } tmp = dst_len; /* When the input data is not compressed at all, * lzo1x_decompress_safe will fail, so call memcpy() * instead */ if (unlikely(dst_len == src_len)) memcpy(out_buf, in_buf, src_len); else { r = lzo1x_decompress_safe((u8 *) in_buf, src_len, out_buf, &tmp); if (r != LZO_E_OK || dst_len != tmp) { error("Compressed data violation"); goto exit_2; } } if (flush && flush(out_buf, dst_len) != dst_len) goto exit_2; if (output) out_buf += dst_len; if (posp) *posp += src_len + 12; in_buf += src_len; in_len -= src_len; if (fill) { /* * If there happens to still be unused data left in * in_buf, move it to the beginning of the buffer. * Use a loop to avoid memmove() dependency. */ if (in_len > 0) for (skip = 0; skip < in_len; ++skip) in_buf_save[skip] = in_buf[skip]; in_buf = in_buf_save; } } ret = 0; exit_2: if (!input) free(in_buf_save); exit_1: if (!output) free(out_buf); exit: return ret; }
static int decompress_lzo(struct btrfs_root *root, unsigned char *inbuf, char *outbuf, u64 compress_len, u64 *decompress_len) { size_t new_len; size_t in_len; size_t out_len = 0; size_t tot_len; size_t tot_in; int ret; ret = lzo_init(); if (ret != LZO_E_OK) { error("lzo init returned %d", ret); return -1; } tot_len = read_compress_length(inbuf); inbuf += LZO_LEN; tot_in = LZO_LEN; while (tot_in < tot_len) { size_t mod_page; size_t rem_page; in_len = read_compress_length(inbuf); if ((tot_in + LZO_LEN + in_len) > tot_len) { error("bad compress length %lu", (unsigned long)in_len); return -1; } inbuf += LZO_LEN; tot_in += LZO_LEN; new_len = lzo1x_worst_compress(root->fs_info->sectorsize); ret = lzo1x_decompress_safe((const unsigned char *)inbuf, in_len, (unsigned char *)outbuf, (void *)&new_len, NULL); if (ret != LZO_E_OK) { error("lzo decompress failed: %d", ret); return -1; } out_len += new_len; outbuf += new_len; inbuf += in_len; tot_in += in_len; /* * If the 4 byte header does not fit to the rest of the page we * have to move to the next one, unless we read some garbage */ mod_page = tot_in % root->fs_info->sectorsize; rem_page = root->fs_info->sectorsize - mod_page; if (rem_page < LZO_LEN) { inbuf += rem_page; tot_in += rem_page; } } *decompress_len = out_len; return 0; }
STATIC inline int INIT unlzo(u8 *input, int in_len, int (*fill) (void *, unsigned int), int (*flush) (void *, unsigned int), u8 *output, int *posp, void (*error) (char *x)) { u8 r = 0; int skip = 0; u32 src_len, dst_len; size_t tmp; u8 *in_buf, *in_buf_save, *out_buf; int ret = -1; if (output) { out_buf = output; } else if (!flush) { error("NULL output pointer and no flush function provided"); goto exit; } else { out_buf = malloc(LZO_BLOCK_SIZE); if (!out_buf) { error("Could not allocate output buffer"); goto exit; } } if (input && fill) { error("Both input pointer and fill function provided, don't know what to do"); goto exit_1; } else if (input) { in_buf = input; } else if (!fill) { error("NULL input pointer and missing fill function"); goto exit_1; } else { in_buf = malloc(lzo1x_worst_compress(LZO_BLOCK_SIZE)); if (!in_buf) { error("Could not allocate input buffer"); goto exit_1; } } in_buf_save = in_buf; if (posp) *posp = 0; if (fill) { /* */ in_buf += HEADER_SIZE_MAX; in_len = fill(in_buf, HEADER_SIZE_MAX); } if (!parse_header(in_buf, &skip, in_len)) { error("invalid header"); goto exit_2; } in_buf += skip; in_len -= skip; if (fill) { /* */ memcpy(in_buf_save, in_buf, in_len); in_buf = in_buf_save; } if (posp) *posp = skip; for (;;) { /* */ if (fill && in_len < 4) { skip = fill(in_buf + in_len, 4 - in_len); if (skip > 0) in_len += skip; } if (in_len < 4) { error("file corrupted"); goto exit_2; } dst_len = get_unaligned_be32(in_buf); in_buf += 4; in_len -= 4; /* */ if (dst_len == 0) { if (posp) *posp += 4; break; } if (dst_len > LZO_BLOCK_SIZE) { error("dest len longer than block size"); goto exit_2; } /* */ if (fill && in_len < 8) { skip = fill(in_buf + in_len, 8 - in_len); if (skip > 0) in_len += skip; } if (in_len < 8) { error("file corrupted"); goto exit_2; } src_len = get_unaligned_be32(in_buf); in_buf += 8; in_len -= 8; if (src_len <= 0 || src_len > dst_len) { error("file corrupted"); goto exit_2; } /* */ if (fill && in_len < src_len) { skip = fill(in_buf + in_len, src_len - in_len); if (skip > 0) in_len += skip; } if (in_len < src_len) { error("file corrupted"); goto exit_2; } tmp = dst_len; /* */ if (unlikely(dst_len == src_len)) memcpy(out_buf, in_buf, src_len); else { r = lzo1x_decompress_safe((u8 *) in_buf, src_len, out_buf, &tmp); if (r != LZO_E_OK || dst_len != tmp) { error("Compressed data violation"); goto exit_2; } } if (flush && flush(out_buf, dst_len) != dst_len) goto exit_2; if (output) out_buf += dst_len; if (posp) *posp += src_len + 12; in_buf += src_len; in_len -= src_len; if (fill) { /* */ if (in_len > 0) for (skip = 0; skip < in_len; ++skip) in_buf_save[skip] = in_buf[skip]; in_buf = in_buf_save; } } ret = 0; exit_2: if (!input) free(in_buf_save); exit_1: if (!output) free(out_buf); exit: return ret; }