static OSMPBF__Blob *
read_blob(OSMPBF__BlobHeader *header, FILE *f, unsigned char *buffer)
{
int len=header->datasize;
SANITY_CHECK_LENGTH(len, MAX_BLOB_LENGTH)
if (fread(buffer, len, 1, f) != 1)
return NULL;
return osmpbf__blob__unpack(&protobuf_c_system_allocator, len, buffer);
}
OSMPBF__Blob* parse_blob_body(struct Parser* const p, const OSMPBF__BlobHeader* const bh) {
OSMPBF__Blob* b = 0;
b = osmpbf__blob__unpack(0, bh->datasize, p->cur);
if (b == 0)
fprintf(stderr, "%s:%d error parsing blob of type %s\n",
__FILE__, __LINE__, bh->type);
else {
fprintf(stderr, "osm_blob: has_raw %d, has_raw_size %d, has_zlib_data %d, has_lzma_data %d\n",
b->has_raw, b->has_raw_size, b->has_zlib_data, b->has_lzma_data);
p->cur += bh->datasize;
}
return b;
}
static void *read_blob(FILE *input, size_t length, size_t *raw_length)
{
VALUE exc = Qnil;
void *buffer = NULL;
OSMPBF__Blob *blob = NULL;
if(length < 1 || length > MAX_BLOB_SIZE)
rb_raise(rb_eIOError, "Invalid blob size");
if(!(buffer = malloc(length)))
rb_raise(rb_eNoMemError, "Unable to allocate memory for the blob");
if(fread(buffer, length, 1, input))
blob = osmpbf__blob__unpack(NULL, length, buffer);
free(buffer);
if(blob == NULL)
rb_raise(rb_eIOError, "Unable to read the blob");
void *data = NULL;
if(blob->has_raw)
{
if(!(data = malloc(blob->raw.len)))
{
exc = rb_exc_new2(rb_eNoMemError, "Unable to allocate memory for the data");
goto exit_nicely;
}
memcpy(data, blob->raw.data, blob->raw.len);
*raw_length = blob->raw.len;
}
else if(blob->has_zlib_data)
{
if(!(data = malloc(MAX_BLOB_SIZE)))
{
exc = rb_exc_new2(rb_eNoMemError, "Unable to allocate memory for the data");
goto exit_nicely;
}
int ret;
z_stream strm;
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.avail_in = (unsigned int)blob->zlib_data.len;
strm.next_in = blob->zlib_data.data;
strm.avail_out = blob->raw_size;
strm.next_out = data;
ret = inflateInit(&strm);
if (ret != Z_OK)
{
exc = rb_exc_new2(rb_eRuntimeError, "Zlib init failed");
goto exit_nicely;
}
ret = inflate(&strm, Z_NO_FLUSH);
(void)inflateEnd(&strm);
if (ret != Z_STREAM_END)
{
exc = rb_exc_new2(rb_eRuntimeError, "Zlib compression failed");
goto exit_nicely;
}
*raw_length = blob->raw_size;
}
else if(blob->has_lzma_data)
{
exc = rb_exc_new2(rb_eNotImpError, "LZMA compression is not supported");
goto exit_nicely;
}
else
{
exc = rb_exc_new2(rb_eNotImpError, "Unknown blob format");
goto exit_nicely;
}
exit_nicely:
if(blob) osmpbf__blob__free_unpacked(blob, NULL);
if(!data) free(data);
if(exc != Qnil) rb_exc_raise(exc);
return data;
}