bfd_boolean bfd_is_section_compressed (bfd *abfd, sec_ptr sec) { int compression_header_size; return (bfd_is_section_compressed_with_header (abfd, sec, &compression_header_size) && compression_header_size >= 0); }
static bfd_size_type bfd_compress_section_contents (bfd *abfd, sec_ptr sec, bfd_byte *uncompressed_buffer, bfd_size_type uncompressed_size) { uLong compressed_size; bfd_byte *buffer; bfd_size_type buffer_size; bfd_boolean decompress; #if defined(__GNUC__) && GCC_VERSION < 4007 /* Work around a GCC uninitialized warning bug fixed in GCC 4.7. */ int zlib_size = 0; #else int zlib_size; #endif int orig_compression_header_size; int compression_header_size = bfd_get_compression_header_size (abfd, NULL); bfd_boolean compressed = bfd_is_section_compressed_with_header (abfd, sec, &orig_compression_header_size); if (compressed) { /* We shouldn't decompress unsupported compressed section. */ if (orig_compression_header_size < 0) abort (); /* Different compression schemes. Just move the compressed section contents to the right position. */ if (orig_compression_header_size == 0) { /* Convert it from .zdebug* section. Get the uncompressed size first. */ zlib_size = uncompressed_size; compressed_size = zlib_size + compression_header_size; uncompressed_size = bfd_getb64 (uncompressed_buffer + 4); } else { /* Convert it to .zdebug* section. */ zlib_size = uncompressed_size - orig_compression_header_size; compressed_size = zlib_size; } } else compressed_size = compressBound (uncompressed_size) + 12; /* When converting from .zdebug* section, uncompress if it leads to smaller size. */ if (compressed && orig_compression_header_size == 0 && compressed_size > uncompressed_size) { decompress = TRUE; buffer_size = uncompressed_size; } else { decompress = FALSE; buffer_size = compressed_size + compression_header_size; } buffer = (bfd_byte *) bfd_alloc (abfd, buffer_size); if (buffer == NULL) return 0; if (compressed) { sec->size = uncompressed_size; if (decompress) { if (!decompress_contents (uncompressed_buffer, zlib_size, buffer, uncompressed_size)) { bfd_set_error (bfd_error_bad_value); bfd_release (abfd, buffer); return 0; } free (uncompressed_buffer); sec->contents = buffer; sec->compress_status = COMPRESS_SECTION_DONE; return uncompressed_size; } else { bfd_update_compression_header (abfd, buffer, sec); memmove (buffer + compression_header_size, uncompressed_buffer + orig_compression_header_size, zlib_size); } } else { bfd_size_type size = uncompressed_size; int header_size = 12 + compression_header_size; if (compress ((Bytef*) buffer + header_size, &compressed_size, (const Bytef*) uncompressed_buffer, uncompressed_size) != Z_OK) { bfd_release (abfd, buffer); bfd_set_error (bfd_error_bad_value); return 0; } compressed_size += header_size; /* PR binutils/18087: If compression didn't make the section smaller, just keep it uncompressed. */ if (compressed_size < uncompressed_size) { bfd_update_compression_header (abfd, buffer, sec); /* Write the zlib header. In this case, it should be "ZLIB" followed by the uncompressed section size, 8 bytes in big-endian order. */ memcpy (buffer + compression_header_size, "ZLIB", 4); bfd_putb64 (size, buffer + compression_header_size + 4); } else { /* NOTE: There is a small memory leak here since uncompressed_buffer is malloced and won't be freed. */ bfd_release (abfd, buffer); sec->contents = uncompressed_buffer; sec->compress_status = COMPRESS_SECTION_NONE; return uncompressed_size; } } free (uncompressed_buffer); sec->contents = buffer; sec->size = compressed_size; sec->compress_status = COMPRESS_SECTION_DONE; return uncompressed_size; }
static bfd_size_type bfd_compress_section_contents (bfd *abfd, sec_ptr sec, bfd_byte *uncompressed_buffer, bfd_size_type uncompressed_size) { uLong compressed_size; bfd_byte *buffer; bfd_size_type buffer_size; bfd_boolean decompress; int zlib_size = 0; int orig_compression_header_size; bfd_size_type orig_uncompressed_size; int header_size = bfd_get_compression_header_size (abfd, NULL); bfd_boolean compressed = bfd_is_section_compressed_with_header (abfd, sec, &orig_compression_header_size, &orig_uncompressed_size); /* Either ELF compression header or the 12-byte, "ZLIB" + 8-byte size, overhead in .zdebug* section. */ if (!header_size) header_size = 12; if (compressed) { /* We shouldn't decompress unsupported compressed section. */ if (orig_compression_header_size < 0) abort (); /* Different compression schemes. Just move the compressed section contents to the right position. */ if (orig_compression_header_size == 0) { /* Convert it from .zdebug* section. Get the uncompressed size first. We need to substract the 12-byte overhead in .zdebug* section. Set orig_compression_header_size to the 12-bye overhead. */ orig_compression_header_size = 12; zlib_size = uncompressed_size - 12; } else { /* Convert it to .zdebug* section. */ zlib_size = uncompressed_size - orig_compression_header_size; } /* Add the header size. */ compressed_size = zlib_size + header_size; } else compressed_size = compressBound (uncompressed_size) + header_size; /* Uncompress if it leads to smaller size. */ if (compressed && compressed_size > orig_uncompressed_size) { decompress = TRUE; buffer_size = orig_uncompressed_size; } else { decompress = FALSE; buffer_size = compressed_size; } buffer = (bfd_byte *) bfd_alloc (abfd, buffer_size); if (buffer == NULL) return 0; if (compressed) { sec->size = orig_uncompressed_size; if (decompress) { if (!decompress_contents (uncompressed_buffer + orig_compression_header_size, zlib_size, buffer, buffer_size)) { bfd_set_error (bfd_error_bad_value); bfd_release (abfd, buffer); return 0; } free (uncompressed_buffer); sec->contents = buffer; sec->compress_status = COMPRESS_SECTION_DONE; return orig_uncompressed_size; } else { bfd_update_compression_header (abfd, buffer, sec); memmove (buffer + header_size, uncompressed_buffer + orig_compression_header_size, zlib_size); } } else { if (compress ((Bytef*) buffer + header_size, &compressed_size, (const Bytef*) uncompressed_buffer, uncompressed_size) != Z_OK) { bfd_release (abfd, buffer); bfd_set_error (bfd_error_bad_value); return 0; } compressed_size += header_size; /* PR binutils/18087: If compression didn't make the section smaller, just keep it uncompressed. */ if (compressed_size < uncompressed_size) bfd_update_compression_header (abfd, buffer, sec); else { /* NOTE: There is a small memory leak here since uncompressed_buffer is malloced and won't be freed. */ bfd_release (abfd, buffer); sec->contents = uncompressed_buffer; sec->compress_status = COMPRESS_SECTION_NONE; return uncompressed_size; } } free (uncompressed_buffer); sec->contents = buffer; sec->size = compressed_size; sec->compress_status = COMPRESS_SECTION_DONE; return uncompressed_size; }