diff options
author | Miles Bader <miles@gnu.org> | 1996-05-10 21:09:50 +0000 |
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committer | Miles Bader <miles@gnu.org> | 1996-05-10 21:09:50 +0000 |
commit | 671cdf2830e532856e674688a35f0ab6f2aff0e4 (patch) | |
tree | 88bea4f30ad2c5f952f211299db37d1f3e9e78eb /libstore | |
parent | caca9913c9aaf8f557028ad177b24c516044f281 (diff) |
(store_default_leaf_decode):
Convert the slice of the offset vector we're using into a vector of
store_runs to pass to CREATE.
Change type of CREATE accordingly.
Diffstat (limited to 'libstore')
-rw-r--r-- | libstore/decode.c | 43 |
1 files changed, 38 insertions, 5 deletions
diff --git a/libstore/decode.c b/libstore/decode.c index d3cc0d45..f16ace73 100644 --- a/libstore/decode.c +++ b/libstore/decode.c @@ -25,20 +25,23 @@ #include "store.h" +/* The maximum number of runs for which we allocate run vectors on the stack. */ +#define MAX_STACK_RUNS (16*1024 / sizeof (struct store_run)) + /* Decodes the standard leaf encoding that's common to various builtin formats, and calls CREATE to actually create the store. */ error_t store_default_leaf_decode (struct store_enc *enc, error_t (*create)(mach_port_t port, size_t block_size, - const off_t *runs, + const struct store_run *runs, size_t num_runs, struct store **store), struct store **store) { char *misc; error_t err; - int type, flags; + int type, flags, i; mach_port_t port; size_t block_size, num_runs, name_len, misc_len; @@ -69,9 +72,39 @@ store_default_leaf_decode (struct store_enc *enc, /* Read encoded ports (be careful to deallocate this if we barf). */ port = enc->ports[enc->cur_port++]; - err = - (*create)(port, block_size, enc->offsets + enc->cur_offset, num_runs, - store); + /* Since the runs are passed in an array of off_t pairs, and we use struct + store_run, we have to make a temporary array to hold the (probably + bitwise identical) converted representation to pass to CREATE. */ + if (num_runs <= MAX_STACK_RUNS) + { + struct store_run runs[num_runs]; + off_t *e = enc->offsets + enc->cur_offset; + for (i = 0; i < num_runs; i++) + { + runs[i].start = *e++; + runs[i].length = *e++; + } + err = (*create)(port, block_size, runs, num_runs, store); + } + else + /* Ack. Too many runs to allocate the temporary RUNS array on the stack. + This will probably never happen. */ + { + struct store_run *runs = malloc (num_runs * sizeof (struct store_run)); + if (runs) + { + off_t *e = enc->offsets + enc->cur_offset; + for (i = 0; i < num_runs; i++) + { + runs[i].start = *e++; + runs[i].length = *e++; + } + err = (*create)(port, block_size, runs, num_runs, store); + free (runs); + } + else + err = ENOMEM; + } if (err) { |