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Create zlib_parse_file_init

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This commit is contained in:
twinaphex 2015-05-27 00:28:32 +02:00
parent 33ba65075f
commit 512edb1474
1 changed files with 37 additions and 28 deletions
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65
libretro-common/file/file_extract.c
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@ -557,6 +557,42 @@ int zlib_parse_file_iterate_step(zlib_transfer_t *state,
return 1;
}
int zlib_parse_file_init(zlib_transfer_t *state,
const char *file)
{
state->backend = zlib_get_default_file_backend();
if (!state->backend)
return -1;
state->handle = state->backend->open(file);
if (!state->handle)
return -1;
state->zip_size = state->backend->size(state->handle);
if (state->zip_size < 22)
return -1;
state->data = state->backend->data(state->handle);
state->footer = state->data + state->zip_size - 22;
for (;; state->footer--)
{
if (state->footer <= state->data + 22)
return -1;
if (read_le(state->footer, 4) == END_OF_CENTRAL_DIR_SIGNATURE)
{
unsigned comment_len = read_le(state->footer + 20, 2);
if (state->footer + 22 + comment_len == state->data + state->zip_size)
break;
}
}
state->directory = state->data + read_le(state->footer + 16, 4);
return 0;
}
/**
* zlib_parse_file:
* @file : filename path of archive
@ -576,36 +612,9 @@ bool zlib_parse_file(const char *file, const char *valid_exts,
zlib_transfer_t state = {0};
bool ret = true;
state.backend = zlib_get_default_file_backend();
if (!state.backend)
return false;
state.handle = state.backend->open(file);
if (!state.handle)
if (zlib_parse_file_init(&state, file) != 0)
GOTO_END_ERROR();
state.zip_size = state.backend->size(state.handle);
if (state.zip_size < 22)
GOTO_END_ERROR();
state.data = state.backend->data(state.handle);
state.footer = state.data + state.zip_size - 22;
for (;; state.footer--)
{
if (state.footer <= state.data + 22)
GOTO_END_ERROR();
if (read_le(state.footer, 4) == END_OF_CENTRAL_DIR_SIGNATURE)
{
unsigned comment_len = read_le(state.footer + 20, 2);
if (state.footer + 22 + comment_len == state.data + state.zip_size)
break;
}
}
state.directory = state.data + read_le(state.footer + 16, 4);
for (;;)
{
int ret2 = zlib_parse_file_iterate_step(&state,