-/* Decompress a section that was compressed using zlib. Store the
- decompressed buffer, and its size, in DESCRIPTOR. */
-
-static void
-zlib_decompress_section (asection *sectp,
- struct gdb_bfd_section_data *descriptor)
-{
- bfd *abfd = sectp->owner;
-#ifndef HAVE_ZLIB_H
- error (_("Support for zlib-compressed data (from '%s', section '%s') "
- "is disabled in this copy of GDB"),
- bfd_get_filename (abfd),
- bfd_get_section_name (abfd, sectp));
-#else
- bfd_size_type compressed_size = bfd_get_section_size (sectp);
- gdb_byte *compressed_buffer = xmalloc (compressed_size);
- struct cleanup *cleanup = make_cleanup (xfree, compressed_buffer);
- struct cleanup *inner_cleanup;
- bfd_size_type uncompressed_size;
- gdb_byte *uncompressed_buffer;
- z_stream strm;
- int rc;
- int header_size = 12;
- struct dwarf2_per_bfd_section *section_data;
-
- if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0
- || bfd_bread (compressed_buffer,
- compressed_size, abfd) != compressed_size)
- error (_("can't read data from '%s', section '%s'"),
- bfd_get_filename (abfd),
- bfd_get_section_name (abfd, sectp));
-
- /* Read the zlib header. In this case, it should be "ZLIB" followed
- by the uncompressed section size, 8 bytes in big-endian order. */
- if (compressed_size < header_size
- || strncmp (compressed_buffer, "ZLIB", 4) != 0)
- error (_("corrupt ZLIB header from '%s', section '%s'"),
- bfd_get_filename (abfd),
- bfd_get_section_name (abfd, sectp));
- uncompressed_size = compressed_buffer[4]; uncompressed_size <<= 8;
- uncompressed_size += compressed_buffer[5]; uncompressed_size <<= 8;
- uncompressed_size += compressed_buffer[6]; uncompressed_size <<= 8;
- uncompressed_size += compressed_buffer[7]; uncompressed_size <<= 8;
- uncompressed_size += compressed_buffer[8]; uncompressed_size <<= 8;
- uncompressed_size += compressed_buffer[9]; uncompressed_size <<= 8;
- uncompressed_size += compressed_buffer[10]; uncompressed_size <<= 8;
- uncompressed_size += compressed_buffer[11];
-
- /* It is possible the section consists of several compressed
- buffers concatenated together, so we uncompress in a loop. */
- strm.zalloc = NULL;
- strm.zfree = NULL;
- strm.opaque = NULL;
- strm.avail_in = compressed_size - header_size;
- strm.next_in = (Bytef*) compressed_buffer + header_size;
- strm.avail_out = uncompressed_size;
- uncompressed_buffer = xmalloc (uncompressed_size);
- inner_cleanup = make_cleanup (xfree, uncompressed_buffer);
- rc = inflateInit (&strm);
- while (strm.avail_in > 0)
- {
- if (rc != Z_OK)
- error (_("setting up uncompression in '%s', section '%s': %d"),
- bfd_get_filename (abfd),
- bfd_get_section_name (abfd, sectp),
- rc);
- strm.next_out = ((Bytef*) uncompressed_buffer
- + (uncompressed_size - strm.avail_out));
- rc = inflate (&strm, Z_FINISH);
- if (rc != Z_STREAM_END)
- error (_("zlib error uncompressing from '%s', section '%s': %d"),
- bfd_get_filename (abfd),
- bfd_get_section_name (abfd, sectp),
- rc);
- rc = inflateReset (&strm);
- }
- rc = inflateEnd (&strm);
- if (rc != Z_OK
- || strm.avail_out != 0)
- error (_("concluding uncompression in '%s', section '%s': %d"),
- bfd_get_filename (abfd),
- bfd_get_section_name (abfd, sectp),
- rc);
-
- discard_cleanups (inner_cleanup);
- do_cleanups (cleanup);
-
- /* Attach the data to the BFD section. */
- descriptor->data = uncompressed_buffer;
- descriptor->size = uncompressed_size;
-#endif
-}
-