stb_vorbis: Make static arrays const.

nothings/stb#1660

src/stb_vorbis.h

@@ -839,9 +839,9 @@ struct stb_vorbis
    int close_on_free;
 #endif
 
-   uint8 *stream;
-   uint8 *stream_start;
-   uint8 *stream_end;
+   const uint8 *stream;
+   const uint8 *stream_start;
+   const uint8 *stream_end;
 
    uint32 stream_len;
 
@@ -1081,7 +1081,7 @@ static float square(float x)
 // @OPTIMIZE: called multiple times per-packet with "constants"; move to setup
 static int ilog(int32 n)
 {
-   static signed char log2_4[16] = { 0,1,2,2,3,3,3,3,4,4,4,4,4,4,4,4 };
+   static const signed char log2_4[16] = { 0,1,2,2,3,3,3,3,4,4,4,4,4,4,4,4 };
 
    if (n < 0) return 0; // signed n returns 0
 
@@ -1218,8 +1218,8 @@ static void compute_accelerated_huffman(Codebook *c)
 
 static int STBV_CDECL uint32_compare(const void *p, const void *q)
 {
-   uint32 x = * (uint32 *) p;
-   uint32 y = * (uint32 *) q;
+   uint32 x = * (const uint32 *) p;
+   uint32 y = * (const uint32 *) q;
    return x < y ? -1 : x > y;
 }
 
@@ -1289,7 +1289,7 @@ static void compute_sorted_huffman(Codebook *c, uint8 *lengths, uint32 *values)
 // only run while parsing the header (3 times)
 static int vorbis_validate(uint8 *data)
 {
-   static uint8 vorbis[6] = { 'v', 'o', 'r', 'b', 'i', 's' };
+   static const uint8 vorbis[6] = { 'v', 'o', 'r', 'b', 'i', 's' };
    return memcmp(data, vorbis, 6) == 0;
 }
 
@@ -1380,8 +1380,8 @@ typedef struct
 
 static int STBV_CDECL point_compare(const void *p, const void *q)
 {
-   stbv__floor_ordering *a = (stbv__floor_ordering *) p;
-   stbv__floor_ordering *b = (stbv__floor_ordering *) q;
+   const stbv__floor_ordering *a = (const stbv__floor_ordering *) p;
+   const stbv__floor_ordering *b = (const stbv__floor_ordering *) q;
    return a->x < b->x ? -1 : a->x > b->x;
 }
 
@@ -1526,7 +1526,7 @@ static int set_file_offset(stb_vorbis *f, unsigned int loc)
 }
 
 
-static uint8 ogg_page_header[4] = { 0x4f, 0x67, 0x67, 0x53 };
+static const uint8 ogg_page_header[4] = { 0x4f, 0x67, 0x67, 0x53 };
 
 static int capture_pattern(vorb *f)
 {
@@ -2047,7 +2047,7 @@ static int predict_point(int x, int x0, int x1, int y0, int y1)
 }
 
 // the following table is block-copied from the specification
-static float inverse_db_table[256] =
+static const float inverse_db_table[256] =
 {
   1.0649863e-07f, 1.1341951e-07f, 1.2079015e-07f, 1.2863978e-07f,
   1.3699951e-07f, 1.4590251e-07f, 1.5538408e-07f, 1.6548181e-07f,
@@ -3310,7 +3310,7 @@ static int vorbis_decode_packet_rest(vorb *f, int *len, Mode *m, int left_start,
          if (get_bits(f, 1)) {
             short *finalY;
             uint8 step2_flag[256];
-            static int range_list[4] = { 256, 128, 86, 64 };
+            static const int range_list[4] = { 256, 128, 86, 64 };
             int range = range_list[g->floor1_multiplier-1];
             int offset = 2;
             finalY = f->finalY[i];
@@ -3633,7 +3633,7 @@ static int is_whole_packet_present(stb_vorbis *f)
    // of state to restore (primarily the page segment table)
 
    int s = f->next_seg, first = TRUE;
-   uint8 *p = f->stream;
+   const uint8 *p = f->stream;
 
    if (s != -1) { // if we're not starting the packet with a 'continue on next page' flag
       for (; s < f->segment_count; ++s) {
@@ -3648,7 +3648,7 @@ static int is_whole_packet_present(stb_vorbis *f)
       first = FALSE;
    }
    for (; s == -1;) {
-      uint8 *q;
+      const uint8 *q;
       int n;
 
       // check that we have the page header ready
@@ -4513,7 +4513,7 @@ void stb_vorbis_flush_pushdata(stb_vorbis *f)
    f->channel_buffer_end = 0;
 }
 
-static int vorbis_search_for_page_pushdata(vorb *f, uint8 *data, int data_len)
+static int vorbis_search_for_page_pushdata(vorb *f, const uint8 *data, int data_len)
 {
    int i,n;
    for (i=0; i < f->page_crc_tests; ++i)
@@ -4619,11 +4619,11 @@ int stb_vorbis_decode_frame_pushdata(
 
    if (f->page_crc_tests >= 0) {
       *samples = 0;
-      return vorbis_search_for_page_pushdata(f, (uint8 *) data, data_len);
+      return vorbis_search_for_page_pushdata(f, data, data_len);
    }
 
-   f->stream     = (uint8 *) data;
-   f->stream_end = (uint8 *) data + data_len;
+   f->stream     = (const uint8 *) data;
+   f->stream_end = (const uint8 *) data + data_len;
    f->error      = VORBIS__no_error;
 
    // check that we have the entire packet in memory
@@ -4681,8 +4681,8 @@ stb_vorbis *stb_vorbis_open_pushdata(
 {
    stb_vorbis *f, p;
    vorbis_init(&p, alloc);
-   p.stream     = (uint8 *) data;
-   p.stream_end = (uint8 *) data + data_len;
+   p.stream     = (const uint8 *) data;
+   p.stream_end = (const uint8 *) data + data_len;
    p.push_mode  = TRUE;
    if (!start_decoder(&p)) {
       if (p.eof)
@@ -5310,9 +5310,9 @@ stb_vorbis * stb_vorbis_open_memory(const unsigned char *data, int len, int *err
       return NULL;
    }
    vorbis_init(&p, alloc);
-   p.stream = (uint8 *) data;
-   p.stream_end = (uint8 *) data + len;
-   p.stream_start = (uint8 *) p.stream;
+   p.stream = (const uint8 *) data;
+   p.stream_end = (const uint8 *) data + len;
+   p.stream_start = (const uint8 *) p.stream;
    p.stream_len = len;
    p.push_mode = FALSE;
    if (start_decoder(&p)) {
@@ -5338,7 +5338,7 @@ stb_vorbis * stb_vorbis_open_memory(const unsigned char *data, int len, int *err
 #define C  (PLAYBACK_LEFT  | PLAYBACK_RIGHT | PLAYBACK_MONO)
 #define R  (PLAYBACK_RIGHT | PLAYBACK_MONO)
 
-static int8 channel_position[7][6] =
+static const int8 channel_position[7][6] =
 {
    { 0 },
    { C },
@@ -5453,7 +5453,7 @@ static void convert_samples_short(int buf_c, short **buffer, int b_offset, int d
 {
    int i;
    if (buf_c != data_c && buf_c <= 2 && data_c <= 6) {
-      static int channel_selector[3][2] = { {0}, {PLAYBACK_MONO}, {PLAYBACK_LEFT, PLAYBACK_RIGHT} };
+      static const int channel_selector[3][2] = { {0}, {PLAYBACK_MONO}, {PLAYBACK_LEFT, PLAYBACK_RIGHT} };
       for (i=0; i < buf_c; ++i)
          compute_samples(channel_selector[buf_c][i], buffer[i]+b_offset, data_c, data, d_offset, samples);
    } else {