+#include "safe-ctype.h"
+
+#define MAX_COMPRESSION_HEADER_SIZE 24
+
+static bfd_boolean
+decompress_contents (bfd_byte *compressed_buffer,
+ bfd_size_type compressed_size,
+ bfd_byte *uncompressed_buffer,
+ bfd_size_type uncompressed_size)
+{
+ z_stream strm;
+ int rc;
+
+ /* It is possible the section consists of several compressed
+ buffers concatenated together, so we uncompress in a loop. */
+ /* PR 18313: The state field in the z_stream structure is supposed
+ to be invisible to the user (ie us), but some compilers will
+ still complain about it being used without initialisation. So
+ we first zero the entire z_stream structure and then set the fields
+ that we need. */
+ memset (& strm, 0, sizeof strm);
+ strm.avail_in = compressed_size;
+ strm.next_in = (Bytef*) compressed_buffer;
+ strm.avail_out = uncompressed_size;
+
+ BFD_ASSERT (Z_OK == 0);
+ rc = inflateInit (&strm);
+ while (strm.avail_in > 0 && strm.avail_out > 0)
+ {
+ if (rc != Z_OK)
+ break;
+ strm.next_out = ((Bytef*) uncompressed_buffer
+ + (uncompressed_size - strm.avail_out));
+ rc = inflate (&strm, Z_FINISH);
+ if (rc != Z_STREAM_END)
+ break;
+ rc = inflateReset (&strm);
+ }
+ rc |= inflateEnd (&strm);
+ return rc == Z_OK && strm.avail_out == 0;
+}
+
+/* Compress data of the size specified in @var{uncompressed_size}
+ and pointed to by @var{uncompressed_buffer} using zlib and store
+ as the contents field. This function assumes the contents
+ field was allocated using bfd_malloc() or equivalent.
+
+ Return the uncompressed size if the full section contents is
+ compressed successfully. Otherwise return 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;
+ int zlib_size = 0;
+ int orig_compression_header_size;
+ bfd_size_type orig_uncompressed_size;
+ unsigned int orig_uncompressed_alignment_pow;
+ 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,
+ &orig_uncompressed_alignment_pow);
+
+ /* 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 subtract 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);
+ bfd_set_section_alignment (sec, orig_uncompressed_alignment_pow);
+
+ 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;
+}
+
+/*
+FUNCTION
+ bfd_get_full_section_contents
+
+SYNOPSIS
+ bfd_boolean bfd_get_full_section_contents
+ (bfd *abfd, asection *section, bfd_byte **ptr);
+
+DESCRIPTION
+ Read all data from @var{section} in BFD @var{abfd}, decompress
+ if needed, and store in @var{*ptr}. If @var{*ptr} is NULL,
+ return @var{*ptr} with memory malloc'd by this function.
+
+ Return @code{TRUE} if the full section contents is retrieved
+ successfully. If the section has no contents then this function
+ returns @code{TRUE} but @var{*ptr} is set to NULL.
+*/
+
+bfd_boolean
+bfd_get_full_section_contents (bfd *abfd, sec_ptr sec, bfd_byte **ptr)
+{
+ bfd_size_type sz;
+ bfd_byte *p = *ptr;
+ bfd_boolean ret;
+ bfd_size_type save_size;
+ bfd_size_type save_rawsize;
+ bfd_byte *compressed_buffer;
+ unsigned int compression_header_size;
+
+ if (abfd->direction != write_direction && sec->rawsize != 0)
+ sz = sec->rawsize;
+ else
+ sz = sec->size;
+ if (sz == 0)
+ {
+ *ptr = NULL;
+ return TRUE;
+ }
+
+ switch (sec->compress_status)
+ {
+ case COMPRESS_SECTION_NONE:
+ if (p == NULL)
+ {
+ ufile_ptr filesize = bfd_get_file_size (abfd);
+ if (filesize > 0
+ && filesize < sz
+ /* PR 24753: Linker created sections can be larger than
+ the file size, eg if they are being used to hold stubs. */
+ && (bfd_section_flags (sec) & SEC_LINKER_CREATED) == 0
+ /* PR 24753: Sections which have no content should also be
+ excluded as they contain no size on disk. */
+ && (bfd_section_flags (sec) & SEC_HAS_CONTENTS) != 0
+ /* The MMO file format supports its own special compression
+ technique, but it uses COMPRESS_SECTION_NONE when loading
+ a section's contents. */
+ && bfd_get_flavour (abfd) != bfd_target_mmo_flavour)
+ {
+ /* PR 24708: Avoid attempts to allocate a ridiculous amount
+ of memory. */
+ bfd_set_error (bfd_error_no_memory);
+ _bfd_error_handler
+ /* xgettext:c-format */
+ (_("error: %pB(%pA) section size (%#" PRIx64 " bytes) is larger than file size (%#" PRIx64 " bytes)"),
+ abfd, sec, (uint64_t) sz, (uint64_t) filesize);
+ return FALSE;
+ }
+ p = (bfd_byte *) bfd_malloc (sz);
+ if (p == NULL)
+ {
+ /* PR 20801: Provide a more helpful error message. */
+ if (bfd_get_error () == bfd_error_no_memory)
+ _bfd_error_handler
+ /* xgettext:c-format */
+ (_("error: %pB(%pA) is too large (%#" PRIx64 " bytes)"),
+ abfd, sec, (uint64_t) sz);
+ return FALSE;
+ }
+ }
+
+ if (!bfd_get_section_contents (abfd, sec, p, 0, sz))
+ {
+ if (*ptr != p)
+ free (p);
+ return FALSE;
+ }
+ *ptr = p;
+ return TRUE;
+
+ case DECOMPRESS_SECTION_SIZED:
+ /* Read in the full compressed section contents. */
+ compressed_buffer = (bfd_byte *) bfd_malloc (sec->compressed_size);
+ if (compressed_buffer == NULL)
+ return FALSE;
+ save_rawsize = sec->rawsize;
+ save_size = sec->size;
+ /* Clear rawsize, set size to compressed size and set compress_status
+ to COMPRESS_SECTION_NONE. If the compressed size is bigger than
+ the uncompressed size, bfd_get_section_contents will fail. */
+ sec->rawsize = 0;
+ sec->size = sec->compressed_size;
+ sec->compress_status = COMPRESS_SECTION_NONE;
+ ret = bfd_get_section_contents (abfd, sec, compressed_buffer,
+ 0, sec->compressed_size);
+ /* Restore rawsize and size. */
+ sec->rawsize = save_rawsize;
+ sec->size = save_size;
+ sec->compress_status = DECOMPRESS_SECTION_SIZED;
+ if (!ret)
+ goto fail_compressed;
+
+ if (p == NULL)
+ p = (bfd_byte *) bfd_malloc (sz);
+ if (p == NULL)
+ goto fail_compressed;
+
+ compression_header_size = bfd_get_compression_header_size (abfd, sec);
+ if (compression_header_size == 0)
+ /* Set header size to the zlib header size if it is a
+ SHF_COMPRESSED section. */
+ compression_header_size = 12;
+ if (!decompress_contents (compressed_buffer + compression_header_size,
+ sec->compressed_size - compression_header_size, p, sz))
+ {
+ bfd_set_error (bfd_error_bad_value);
+ if (p != *ptr)
+ free (p);
+ fail_compressed:
+ free (compressed_buffer);
+ return FALSE;
+ }
+
+ free (compressed_buffer);
+ *ptr = p;
+ return TRUE;
+
+ case COMPRESS_SECTION_DONE:
+ if (sec->contents == NULL)
+ return FALSE;
+ if (p == NULL)
+ {
+ p = (bfd_byte *) bfd_malloc (sz);
+ if (p == NULL)
+ return FALSE;
+ *ptr = p;
+ }
+ /* PR 17512; file: 5bc29788. */
+ if (p != sec->contents)
+ memcpy (p, sec->contents, sz);
+ return TRUE;
+
+ default:
+ abort ();
+ }
+}
projects / deliverable / binutils-gdb.git / blobdiff