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libsysprof: ensure we always have trailing \0 on bytes

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This is needed so that our invariants elsewhere are maintained.
This commit is contained in:
Christian Hergert
2023-07-28 11:59:32 -07:00
parent afe71d7562
commit dd4686404c
1 changed files with 14 additions and 3 deletions
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17
src/libsysprof/sysprof-document-file.c
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@ -160,6 +160,7 @@ sysprof_document_file_get_path (SysprofDocumentFile *self)
GBytes *
sysprof_document_file_dup_bytes (SysprofDocumentFile *self)
{
static const char zero = 0;
GArray *ar;
guint len;
@ -184,16 +185,26 @@ sysprof_document_file_dup_bytes (SysprofDocumentFile *self)
g_autoptr(GOutputStream) memory_output = g_memory_output_stream_new_resizable ();
g_autoptr(GZlibDecompressor) zlib = g_zlib_decompressor_new (G_ZLIB_COMPRESSOR_FORMAT_GZIP);
g_autoptr(GOutputStream) zlib_output = g_converter_output_stream_new (memory_output, G_CONVERTER (zlib));
g_autoptr(GBytes) bytes = NULL;
g_output_stream_splice (zlib_output,
input,
(G_OUTPUT_STREAM_SPLICE_CLOSE_SOURCE |
G_OUTPUT_STREAM_SPLICE_CLOSE_TARGET),
G_OUTPUT_STREAM_SPLICE_CLOSE_SOURCE,
NULL, NULL);
g_output_stream_write (memory_output, &zero, 1, NULL, NULL);
g_output_stream_close (memory_output, NULL, NULL);
bytes = g_memory_output_stream_steal_as_bytes (G_MEMORY_OUTPUT_STREAM (memory_output));
return g_memory_output_stream_steal_as_bytes (G_MEMORY_OUTPUT_STREAM (memory_output));
g_assert (bytes != NULL);
g_assert (g_bytes_get_size (bytes) > 0);
g_assert (((char *)g_bytes_get_data (bytes, NULL))[g_bytes_get_size (bytes)-1] == 0);
return g_bytes_new_from_bytes (bytes, 0, g_bytes_get_size (bytes) - 1);
}
g_array_append_val (ar, zero);
g_assert (ar->data[len] == 0);
return g_bytes_new_take (g_array_free (ar, FALSE), len);
}