update libretro-common

desmume/src/libretro-common/file/archive_file.c

@@ -216,9 +216,6 @@ static int file_archive_get_file_list_cb(
    (void)csize;
    (void)size;
    (void)checksum;
-   (void)valid_exts;
-   (void)file_ext;
-   (void)ext_list;
 
    memset(&attr, 0, sizeof(attr));
 
@@ -538,10 +535,8 @@ static bool file_archive_parse_file(const char *file, const char *valid_exts,
 
    for (;;)
    {
-      int ret = file_archive_parse_file_iterate(&state, &returnerr, file,
+      if (file_archive_parse_file_iterate(&state, &returnerr, file,
-            valid_exts, file_cb, userdata);
+            valid_exts, file_cb, userdata) != 0)
-
-      if (ret != 0)
          break;
    }
 
@@ -656,7 +651,7 @@ bool file_archive_perform_mode(const char *path, const char *valid_exts,
    {
       case ZLIB_MODE_UNCOMPRESSED:
          if (!filestream_write_file(path, cdata, size))
-            return false;
+            goto error;
          break;
 
       case ZLIB_MODE_DEFLATE:
@@ -667,7 +662,7 @@ bool file_archive_perform_mode(const char *path, const char *valid_exts,
 
             if (!handle.backend->stream_decompress_data_to_file_init(&handle,
                      cdata, csize, size))
-               return false;
+               goto error;
 
             do{
                ret = handle.backend->stream_decompress_data_to_file_iterate(
@@ -677,14 +672,17 @@ bool file_archive_perform_mode(const char *path, const char *valid_exts,
             if (!file_archive_decompress_data_to_file(&handle,
                      ret, path, valid_exts,
                      cdata, csize, size, crc32))
-               return false;
+               goto error;
          }
          break;
       default:
-         return false;
+         goto error;
    }
 
    return true;
+
+error:
+   return false;
 }
 
 const struct file_archive_file_backend *file_archive_get_default_file_backend(void)

desmume/src/libretro-common/file/archive_file_zlib.c

@@ -167,7 +167,7 @@ static int zlib_stream_decompress_data_to_file_iterate(void *data)
    z_stream *stream = (z_stream*)data;
 
    if (!stream)
-      return -1;
+      goto error;
 
    zstatus = inflate(stream, Z_NO_FLUSH);
 
@@ -175,9 +175,12 @@ static int zlib_stream_decompress_data_to_file_iterate(void *data)
       return 1;
 
    if (zstatus != Z_OK && zstatus != Z_BUF_ERROR)
-      return -1;
+      goto error;
 
    return 0;
+
+error:
+   return -1;
 }
 
 static void zlib_stream_compress_init(void *data, int level)

desmume/src/libretro-common/glsm/glsm.c

@@ -421,6 +421,15 @@ void rglLinkProgram(GLuint program)
    glLinkProgram(program);
 }
 
+void rglFramebufferTexture(GLenum target, GLenum attachment,
+  	GLuint texture, GLint level)
+{
+#if defined(HAVE_OPENGLES) && !defined(HAVE_OPENGLES32)
+#else
+   glFramebufferTexture(target, attachment, texture, level);
+#endif
+}
+
 void rglFramebufferTexture2D(GLenum target, GLenum attachment,
       GLenum textarget, GLuint texture, GLint level)
 {
@@ -446,7 +455,7 @@ void rglFramebufferRenderbuffer(GLenum target, GLenum attachment,
    glFramebufferRenderbuffer(target, attachment, renderbuffertarget, renderbuffer);
 }
 
-void rglDeleteFramebuffers(GLsizei n, GLuint *framebuffers)
+void rglDeleteFramebuffers(GLsizei n, const GLuint *framebuffers)
 {
    glDeleteFramebuffers(n, framebuffers);
 }
@@ -703,6 +712,12 @@ void rglUniform4fv(GLint location, GLsizei count, const GLfloat *value)
    glUniform4fv(location, count, value);
 }
 
+void rglTexStorage2D(GLenum target, GLsizei levels, GLenum internalFormat,
+      GLsizei width, GLsizei height)
+{
+   glTexStorage2D(target, levels, internalFormat, width, height);
+}
+
 void rglPolygonOffset(GLfloat factor, GLfloat units)
 {
    glsm_ctl(GLSM_CTL_IMM_VBO_DRAW, NULL);
@@ -712,6 +727,41 @@ void rglPolygonOffset(GLfloat factor, GLfloat units)
    gl_state.polygonoffset.units  = units;
 }
 
+void rglDrawBuffers(GLsizei n, const GLenum *bufs)
+{
+#if defined(HAVE_OPENGLES) && !defined(HAVE_OPENGLES3) && !defined(HAVE_OPENGLES31)
+#else
+   glDrawBuffers(n, bufs);
+#endif
+}
+
+void rglBlendEquation(GLenum mode)
+{
+   glBlendEquation(mode);
+}
+
+void rglBlendColor(GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha)
+{
+   glBlendColor(red, green, blue, alpha);
+}
+
+
+void rglBindVertexArray(GLuint array)
+{
+#if defined(HAVE_OPENGLES) && !defined(HAVE_OPENGLES3) && !defined(HAVE_OPENGLES31)
+#else
+   glBindVertexArray(array);
+#endif
+}
+
+void rglGenVertexArrays(GLsizei n, GLuint *arrays)
+{
+#if defined(HAVE_OPENGLES) && !defined(HAVE_OPENGLES3) && !defined(HAVE_OPENGLES31)
+#else
+   glGenVertexArrays(n, arrays);
+#endif
+}
+
 /* GLSM-side */
 
 static void glsm_state_setup(void)

desmume/src/libretro-common/include/glsm/glsmsym.h

@@ -41,6 +41,7 @@ extern "C" {
 #define glCompressedTexImage2D      rglCompressedTexImage2D
 #define glBindTexture               rglBindTexture
 #define glActiveTexture             rglActiveTexture
+#define glFramebufferTexture        rglFramebufferTexture
 #define glFramebufferTexture2D      rglFramebufferTexture2D
 #define glFramebufferRenderbuffer   rglFramebufferRenderbuffer
 #define glDeleteFramebuffers        rglDeleteFramebuffers
@@ -112,22 +113,35 @@ extern "C" {
 #define glReadBuffer                rglReadBuffer
 #define glUniformMatrix4fv          rglUniformMatrix4fv
 #define glGetAttribLocation         rglGetAttribLocation
+#define glTexStorage2D              rglTexStorage2D
+#define glDrawBuffers               rglDrawBuffers
+#define glGenVertexArrays           rglGenVertexArrays
+#define glBindVertexArray           rglBindVertexArray
+#define glBlendEquation             rglBlendEquation
+#define glBlendColor                rglBlendColor
 
+void rglBlendColor(GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha);
+void rglBlendEquation(GLenum mode);
+void rglGenVertexArrays(GLsizei n, GLuint *arrays);
 void rglReadBuffer(GLenum mode);
 void rglPixelStorei(GLenum pname, GLint param);
 void rglTexCoord2f(GLfloat s, GLfloat t);
 void rglDrawElements(GLenum mode, GLsizei count, GLenum type,
                            const GLvoid * indices);
+void rglTexStorage2D(GLenum target, GLsizei levels, GLenum internalFormat,
+      GLsizei width, GLsizei height);
 void rglCompressedTexImage2D(GLenum target, GLint level,
       GLenum internalformat, GLsizei width, GLsizei height,
       GLint border, GLsizei imageSize, const GLvoid *data);
 void glBindTexture(GLenum target, GLuint texture);
 void glActiveTexture(GLenum texture);
+void rglFramebufferTexture(GLenum target, GLenum attachment,
+  	GLuint texture, GLint level);
 void rglFramebufferTexture2D(GLenum target, GLenum attachment,
       GLenum textarget, GLuint texture, GLint level);
 void rglFramebufferRenderbuffer(GLenum target, GLenum attachment,
       GLenum renderbuffertarget, GLuint renderbuffer);
-void rglDeleteFramebuffers(GLsizei n, GLuint *framebuffers);
+void rglDeleteFramebuffers(GLsizei n, const GLuint *framebuffers);
 void rglRenderbufferStorage(GLenum target, GLenum internalFormat,
       GLsizei width, GLsizei height);
 void rglDeleteTextures(GLsizei n, const GLuint *textures);
@@ -214,6 +228,8 @@ void rglDetachShader(GLuint program, GLuint shader);
 void rglUniformMatrix4fv(GLint location, GLsizei count, GLboolean transpose,
       const GLfloat *value);
 GLint rglGetAttribLocation(GLuint program, const GLchar *name);
+void rglDrawBuffers(GLsizei n, const GLenum *bufs);
+void rglBindVertexArray(GLuint array);
 
 #ifdef __cplusplus
 }

desmume/src/libretro-common/include/lists/file_list.h

@@ -65,6 +65,11 @@ bool file_list_append(file_list_t *userdata, const char *path,
       const char *label, unsigned type, size_t current_directory_ptr,
       size_t entry_index);
 
+bool file_list_prepend(file_list_t *list,
+      const char *path, const char *label,
+      unsigned type, size_t directory_ptr,
+      size_t entry_idx);
+
 void file_list_pop(file_list_t *list, size_t *directory_ptr);
 
 void file_list_clear(file_list_t *list);

desmume/src/libretro-common/include/rthreads/rsemaphore.h

@@ -23,6 +23,10 @@
 #ifndef __LIBRETRO_SDK_SEMAPHORE_H
 #define __LIBRETRO_SDK_SEMAPHORE_H
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef struct ssem ssem_t;
 
 /**
@@ -37,8 +41,14 @@ ssem_t *ssem_new(int value);
 
 void ssem_free(ssem_t *semaphore);
 
+int ssem_get(ssem_t *semaphore);
+
 void ssem_wait(ssem_t *semaphore);
 
 void ssem_signal(ssem_t *semaphore);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* __LIBRETRO_SDK_SEMAPHORE_H */

desmume/src/libretro-common/include/streams/file_stream.h

@@ -66,6 +66,8 @@ int filestream_read_file(const char *path, void **buf, ssize_t *len);
 
 bool filestream_write_file(const char *path, const void *data, ssize_t size);
 
+int filestream_putc(RFILE *stream, int c);
+
 int filestream_get_fd(RFILE *stream);
 
 #ifdef __cplusplus

desmume/src/libretro-common/include/streams/interface_stream.h

@@ -0,0 +1,85 @@
+/* Copyright  (C) 2010-2015 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (interface_stream.h).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef _LIBRETRO_SDK_INTERFACE_STREAM_H
+#define _LIBRETRO_SDK_INTERFACE_STREAM_H
+
+#include <stdint.h>
+#include <stddef.h>
+
+#include <boolean.h>
+
+enum intfstream_type
+{
+   INTFSTREAM_FILE = 0,
+   INTFSTREAM_MEMORY
+};
+
+typedef struct intfstream_internal intfstream_internal_t;
+
+typedef struct intfstream intfstream_t;
+
+typedef struct intfstream_info
+{
+   struct
+   {
+      struct
+      {
+         uint8_t *data;
+         unsigned size;
+      } buf;
+      bool writable;
+   } memory;
+   enum intfstream_type type;
+} intfstream_info_t;
+
+void *intfstream_init(intfstream_info_t *info);
+
+bool intfstream_resize(intfstream_internal_t *intf,
+      intfstream_info_t *info);
+
+bool intfstream_open(intfstream_internal_t *intf,
+      const char *path, unsigned mode, ssize_t len);
+
+ssize_t intfstream_read(intfstream_internal_t *intf,
+      void *s, size_t len);
+
+ssize_t intfstream_write(intfstream_internal_t *intf,
+      const void *s, size_t len);
+
+char *intfstream_gets(intfstream_internal_t *intf,
+      char *buffer, size_t len);
+
+int intfstream_getc(intfstream_internal_t *intf);
+
+int intfstream_seek(intfstream_internal_t *intf,
+      int offset, int whence);
+
+void intfstream_rewind(intfstream_internal_t *intf);
+
+int intfstream_tell(intfstream_internal_t *intf);
+
+void intfstream_putc(intfstream_internal_t *intf, int c);
+
+int intfstream_close(intfstream_internal_t *intf);
+
+#endif

desmume/src/libretro-common/include/streams/memory_stream.h

@@ -28,7 +28,7 @@
 
 typedef struct memstream memstream_t;
 
-memstream_t *memstream_open(void);
+memstream_t *memstream_open(unsigned writing);
 
 void memstream_close(memstream_t *stream);
 
@@ -38,10 +38,14 @@ size_t memstream_write(memstream_t *stream, const void *data, size_t bytes);
 
 int memstream_getc(memstream_t *stream);
 
+void memstream_putc(memstream_t *stream, int c);
+
 char *memstream_gets(memstream_t *stream, char *buffer, size_t len);
 
 size_t memstream_pos(memstream_t *stream);
 
+void memstream_rewind(memstream_t *stream);
+
 int memstream_seek(memstream_t *stream, int offset, int whence);
 
 void memstream_set_buffer(uint8_t *buffer, size_t size);

desmume/src/libretro-common/libco/amd64.c

@@ -24,7 +24,7 @@ static void (*co_swap)(cothread_t, cothread_t) = 0;
 #endif
 
 #ifdef _WIN32
-//ABI: Win64
+/* ABI: Win64 */
 static unsigned char co_swap_function[] = {
   0x48, 0x89, 0x22,                                 /* mov    [rdx],rsp        */
   0x48, 0x8b, 0x21,                                 /* mov    rsp,[rcx]        */
@@ -81,7 +81,7 @@ void co_init(void)
          sizeof(co_swap_function), PAGE_EXECUTE_READWRITE, &old_privileges);
 }
 #else
-//ABI: SystemV
+/* ABI: SystemV */
 #ifndef CO_USE_INLINE_ASM
 static unsigned char co_swap_function[] = {
   0x48, 0x89, 0x26,                                 /* mov    [rsi],rsp      */

desmume/src/libretro-common/lists/file_list.c

@@ -59,6 +59,49 @@ static bool file_list_capacity(file_list_t *list, size_t cap)
    return true;
 }
 
+bool file_list_prepend(file_list_t *list,
+      const char *path, const char *label,
+      unsigned type, size_t directory_ptr,
+      size_t entry_idx)
+{
+   unsigned i;
+   if (list->size >= list->capacity &&
+      !file_list_capacity(list, list->capacity * 2 + 1))
+         return false;
+
+   list->size++;
+
+   for (i = list->size -1; i > 0; i--)
+   {
+      struct item_file *copy = calloc(1, sizeof(struct item_file));
+      
+      memcpy(copy, &list->list[i-1], sizeof(struct item_file));
+
+      memcpy(&list->list[i-1], &list->list[i], sizeof(struct item_file));
+      memcpy(&list->list[i],             copy, sizeof(struct item_file));
+
+      free(copy);
+   }
+
+   memset(&list->list[0], 0, sizeof(file_list_t));
+
+   list->list[0].label         = NULL;
+   list->list[0].path          = NULL;
+   list->list[0].alt           = NULL;
+   list->list[0].userdata      = NULL;
+   list->list[0].actiondata    = NULL;
+   list->list[0].type          = type;
+   list->list[0].directory_ptr = directory_ptr;
+   list->list[0].entry_idx     = entry_idx;
+
+   if (label)
+      list->list[0].label      = strdup(label);
+   if (path)
+      list->list[0].path       = strdup(path);
+
+   return true;
+}
+
 bool file_list_append(file_list_t *list,
       const char *path, const char *label,
       unsigned type, size_t directory_ptr,

desmume/src/libretro-common/queues/message_queue.c

@@ -175,12 +175,9 @@ void msg_queue_clear(msg_queue_t *queue)
  **/
 const char *msg_queue_pull(msg_queue_t *queue)
 {
-   struct queue_elem *front  = NULL, *last = NULL,
+   struct queue_elem *front  = NULL, *last = NULL;
-                     *parent = NULL, *child = NULL;
    size_t tmp_ptr = 1;
     
-   (void)parent;
-   (void)child;
    (void)tmp_ptr;
     
    /* Nothing in queue. */
@@ -203,6 +200,8 @@ const char *msg_queue_pull(msg_queue_t *queue)
 
    for (;;)
    {
+      struct queue_elem *parent = NULL;
+      struct queue_elem *child  = NULL;
       size_t switch_index       = tmp_ptr;
       bool left                 = (tmp_ptr * 2 <= queue->ptr)
          && (queue->elems[tmp_ptr] < queue->elems[tmp_ptr * 2]);

desmume/src/libretro-common/rthreads/rsemaphore.c

@@ -20,6 +20,10 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
+#ifdef __unix__
+#define _POSIX_C_SOURCE 199309
+#endif
+
 #include <stdlib.h>
 
 #include <rthreads/rthreads.h>
@@ -73,6 +77,21 @@ void ssem_free(ssem_t *semaphore)
    free((void*)semaphore);
 }
 
+int ssem_get(ssem_t *semaphore)
+{
+   int val = 0;
+   if (!semaphore)
+      return 0;
+
+   slock_lock(semaphore->mutex);
+
+   val = semaphore->value;
+
+   slock_unlock(semaphore->mutex);
+
+   return val;
+}
+
 void ssem_wait(ssem_t *semaphore)
 {
    if (!semaphore)

desmume/src/libretro-common/rthreads/rthreads.c

@@ -20,6 +20,10 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
+#ifdef __unix__
+#define _POSIX_C_SOURCE 199309
+#endif
+
 #include <stdlib.h>
 
 #include <boolean.h>

desmume/src/libretro-common/streams/file_stream.c

@@ -66,10 +66,6 @@
 #include <streams/file_stream.h>
 #include <memmap.h>
 
-#if 1
-#define HAVE_BUFFERED_IO 1
-#endif
-
 struct RFILE
 {
    unsigned hints;
@@ -78,6 +74,9 @@ struct RFILE
 #elif defined(__CELLOS_LV2__)
    int fd;
 #else
+
+#define HAVE_BUFFERED_IO 1
+
 #if defined(HAVE_BUFFERED_IO)
    FILE *fp;
 #endif
@@ -94,28 +93,25 @@ int filestream_get_fd(RFILE *stream)
 {
    if (!stream)
       return -1;
-#if defined(VITA) || defined(PSP) || defined(__CELLOS_LV2__)
-   return stream->fd;
-#else
 #if defined(HAVE_BUFFERED_IO)
    if ((stream->hints & RFILE_HINT_UNBUFFERED) == 0)
       return fileno(stream->fp);
 #endif
    return stream->fd;
-#endif
 }
 
 RFILE *filestream_open(const char *path, unsigned mode, ssize_t len)
 {
    int            flags = 0;
    int         mode_int = 0;
+#if defined(HAVE_BUFFERED_IO)
    const char *mode_str = NULL;
+#endif
    RFILE        *stream = (RFILE*)calloc(1, sizeof(*stream));
 
    if (!stream)
       return NULL;
 
-   (void)mode_str;
    (void)mode_int;
    (void)flags;
 
@@ -220,7 +216,8 @@ RFILE *filestream_open(const char *path, unsigned mode, ssize_t len)
 
          filestream_rewind(stream);
 
-         stream->mapped = (uint8_t*)mmap((void*)0, stream->mapsize, PROT_READ,  MAP_SHARED, stream->fd, 0);
+         stream->mapped = (uint8_t*)mmap((void*)0,
+               stream->mapsize, PROT_READ,  MAP_SHARED, stream->fd, 0);
 
          if (stream->mapped == MAP_FAILED)
             stream->hints &= ~RFILE_HINT_MMAP;
@@ -243,28 +240,25 @@ error:
 
 ssize_t filestream_seek(RFILE *stream, ssize_t offset, int whence)
 {
-   int ret = 0;
+#if defined(__CELLOS_LV2__)
+   uint64_t pos = 0;
+#endif
    if (!stream)
-      return -1;
+      goto error;
-
-   (void)ret;
 
 #if defined(VITA) || defined(PSP)
-   ret = sceIoLseek(stream->fd, (SceOff)offset, whence);
+   if (sceIoLseek(stream->fd, (SceOff)offset, whence) == -1)
-   if (ret == -1)
+      goto error;
-      return -1;
-   return 0;
 #elif defined(__CELLOS_LV2__)
-   uint64_t pos = 0;
    if (cellFsLseek(stream->fd, offset, whence, &pos) != CELL_FS_SUCCEEDED)
-      return -1;
+      goto error;
-   return 0;
 #else
+
 #if defined(HAVE_BUFFERED_IO)
    if ((stream->hints & RFILE_HINT_UNBUFFERED) == 0)
       return fseek(stream->fp, (long)offset, whence);
-   else
 #endif
+
 #ifdef HAVE_MMAP
    /* Need to check stream->mapped because this function is 
     * called in filestream_open() */
@@ -276,7 +270,7 @@ ssize_t filestream_seek(RFILE *stream, ssize_t offset, int whence)
       {
          case SEEK_SET:
             if (offset < 0)
-                  return -1;
+               goto error;
 
             stream->mappos = offset;
             break;
@@ -284,57 +278,65 @@ ssize_t filestream_seek(RFILE *stream, ssize_t offset, int whence)
          case SEEK_CUR:
             if ((offset < 0 && stream->mappos + offset > stream->mappos) ||
                   (offset > 0 && stream->mappos + offset < stream->mappos))
-                  return -1;
+               goto error;
 
             stream->mappos += offset;
             break;
 
          case SEEK_END:
             if (stream->mapsize + offset < stream->mapsize)
-                  return -1;
+               goto error;
 
             stream->mappos = stream->mapsize + offset;
-
             break;
       }
-
       return stream->mappos;
    }
-      else
 #endif
-      {
+
-         ret = lseek(stream->fd, offset, whence);
+   if (lseek(stream->fd, offset, whence) < 0)
-         return ret < 0 ? -1 : ret;
+      goto error;
-      }
+
 #endif
+
+   return 0;
+
+error:
+   return -1;
 }
 
 ssize_t filestream_tell(RFILE *stream)
 {
-   if (!stream)
+#if defined(__CELLOS_LV2__)
-      return -1;
-#if defined(VITA) || defined(PSP)
-   return sceIoLseek(stream->fd, 0, SEEK_CUR);
-#elif defined(__CELLOS_LV2__)
    uint64_t pos = 0;
+#endif
+   if (!stream)
+      goto error;
+#if defined(VITA) || defined(PSP)
+  if (sceIoLseek(stream->fd, 0, SEEK_CUR) < 0)
+     goto error;
+#elif defined(__CELLOS_LV2__)
    if (cellFsLseek(stream->fd, 0, CELL_FS_SEEK_CUR, &pos) != CELL_FS_SUCCEEDED)
-      return -1;
+      goto error;
-   return 0;
 #else
 #if defined(HAVE_BUFFERED_IO)
    if ((stream->hints & RFILE_HINT_UNBUFFERED) == 0)
       return ftell(stream->fp);
-   else
 #endif
 #ifdef HAVE_MMAP
    /* Need to check stream->mapped because this function 
     * is called in filestream_open() */
    if (stream->mapped && stream->hints & RFILE_HINT_MMAP)
       return stream->mappos;
-      else
 #endif
-         return lseek(stream->fd, 0, SEEK_CUR);
+   if (lseek(stream->fd, 0, SEEK_CUR) < 0)
+      goto error;
 #endif
+
+   return 0;
+
+error:
+   return -1;
 }
 
 void filestream_rewind(RFILE *stream)
@@ -345,25 +347,24 @@ void filestream_rewind(RFILE *stream)
 ssize_t filestream_read(RFILE *stream, void *s, size_t len)
 {
    if (!stream || !s)
-      return -1;
+      goto error;
 #if defined(VITA) || defined(PSP)
    return sceIoRead(stream->fd, s, len);
 #elif defined(__CELLOS_LV2__)
    uint64_t bytes_written;
    if (cellFsRead(stream->fd, s, len, &bytes_written) != CELL_FS_SUCCEEDED)
-      return -1;
+      goto error;
    return bytes_written;
 #else
 #if defined(HAVE_BUFFERED_IO)
    if ((stream->hints & RFILE_HINT_UNBUFFERED) == 0)
       return fread(s, 1, len, stream->fp);
-   else
 #endif
 #ifdef HAVE_MMAP
    if (stream->hints & RFILE_HINT_MMAP)
    {
       if (stream->mappos > stream->mapsize)
-            return -1;
+         goto error;
 
       if (stream->mappos + len > stream->mapsize)
          len = stream->mapsize - stream->mappos;
@@ -373,42 +374,58 @@ ssize_t filestream_read(RFILE *stream, void *s, size_t len)
 
       return len;
    }
-      else
 #endif
    return read(stream->fd, s, len);
 #endif
+
+error:
+   return -1;
 }
 
 ssize_t filestream_write(RFILE *stream, const void *s, size_t len)
 {
    if (!stream)
-      return -1;
+      goto error;
 #if defined(VITA) || defined(PSP)
    return sceIoWrite(stream->fd, s, len);
 #elif defined(__CELLOS_LV2__)
    uint64_t bytes_written;
    if (cellFsWrite(stream->fd, s, len, &bytes_written) != CELL_FS_SUCCEEDED)
-      return -1;
+      goto error;
    return bytes_written;
 #else
 #if defined(HAVE_BUFFERED_IO)
    if ((stream->hints & RFILE_HINT_UNBUFFERED) == 0)
       return fwrite(s, 1, len, stream->fp);
-   else
 #endif
 #ifdef HAVE_MMAP
    if (stream->hints & RFILE_HINT_MMAP)
-         return -1;
+      goto error;
-      else
 #endif
    return write(stream->fd, s, len);
 #endif
+
+error:
+   return -1;
+}
+
+int filestream_putc(RFILE *stream, int c)
+{
+   if (!stream)
+      return EOF;
+
+#if defined(HAVE_BUFFERED_IO)
+   return fputc(c, stream->fp);
+#else
+   /* unimplemented */
+   return EOF;
+#endif
 }
 
 int filestream_close(RFILE *stream)
 {
    if (!stream)
-      return -1;
+      goto error;
 
 #if defined(VITA) || defined(PSP)
    if (stream->fd > 0)
@@ -436,6 +453,9 @@ int filestream_close(RFILE *stream)
    free(stream);
 
    return 0;
+
+error:
+   return -1;
 }
 
 /**
@@ -534,5 +554,8 @@ bool filestream_write_file(const char *path, const void *data, ssize_t size)
    ret = filestream_write(file, data, size);
    filestream_close(file);
 
-   return (ret == size);
+   if (ret != size)
+      return false;
+
+   return true;
 }

desmume/src/libretro-common/streams/interface_stream.c

@@ -0,0 +1,270 @@
+/* Copyright  (C) 2010-2016 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (interface_stream.c).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdlib.h>
+
+#include <streams/interface_stream.h>
+#include <streams/file_stream.h>
+#include <streams/memory_stream.h>
+
+struct intfstream_internal
+{
+   enum intfstream_type type;
+
+   struct
+   {
+      RFILE *fp;
+   } file;
+
+   struct
+   {
+      struct
+      {
+         uint8_t *data;
+         unsigned size;
+      } buf;
+      memstream_t *fp;
+      bool writable;
+   } memory;
+};
+
+bool intfstream_resize(intfstream_internal_t *intf, intfstream_info_t *info)
+{
+   if (!intf || !info)
+      return false;
+
+   switch (intf->type)
+   {
+      case INTFSTREAM_FILE:
+         break;
+      case INTFSTREAM_MEMORY:
+         intf->memory.buf.data = info->memory.buf.data;
+         intf->memory.buf.size = info->memory.buf.size;
+
+         memstream_set_buffer(intf->memory.buf.data,
+               intf->memory.buf.size);
+         break;
+   }
+
+   return true;
+}
+
+bool intfstream_open(intfstream_internal_t *intf, const char *path,
+      unsigned mode, ssize_t len)
+{
+   if (!intf)
+      return false;
+
+   switch (intf->type)
+   {
+      case INTFSTREAM_FILE:
+         intf->file.fp = filestream_open(path, mode, len);
+         if (!intf->file.fp)
+            return false;
+         break;
+      case INTFSTREAM_MEMORY:
+         intf->memory.fp = memstream_open(intf->memory.writable);
+         if (!intf->memory.fp)
+            return false;
+         break;
+   }
+
+   return true;
+}
+
+int intfstream_close(intfstream_internal_t *intf)
+{
+   if (!intf)
+      return -1;
+
+   switch (intf->type)
+   {
+      case INTFSTREAM_FILE:
+         return filestream_close(intf->file.fp);
+      case INTFSTREAM_MEMORY:
+         memstream_close(intf->memory.fp);
+         return 0;
+   }
+
+   return -1;
+}
+
+void *intfstream_init(intfstream_info_t *info)
+{
+   intfstream_internal_t *intf = NULL;
+   if (!info)
+      goto error;
+
+   intf = (intfstream_internal_t*)calloc(1, sizeof(*intf));
+
+   if (!intf)
+      goto error;
+
+   intf->type = info->type;
+
+   switch (intf->type)
+   {
+      case INTFSTREAM_FILE:
+         break;
+      case INTFSTREAM_MEMORY:
+         intf->memory.writable = info->memory.writable;
+         if (!intfstream_resize(intf, info))
+            goto error;
+         break;
+   }
+
+   return intf;
+
+error:
+   if (intf)
+      free(intf);
+   return NULL;
+}
+
+int intfstream_seek(intfstream_internal_t *intf, int offset, int whence)
+{
+   if (!intf)
+      return -1;
+
+   switch (intf->type)
+   {
+      case INTFSTREAM_FILE:
+         return filestream_seek(intf->file.fp, offset, whence);
+      case INTFSTREAM_MEMORY:
+         return memstream_seek(intf->memory.fp, offset, whence);
+   }
+
+   return -1;
+}
+
+ssize_t intfstream_read(intfstream_internal_t *intf, void *s, size_t len)
+{
+   if (!intf)
+      return 0;
+
+   switch (intf->type)
+   {
+      case INTFSTREAM_FILE:
+         return filestream_read(intf->file.fp, s, len);
+      case INTFSTREAM_MEMORY:
+         return memstream_read(intf->memory.fp, s, len);
+   }
+
+   return 0;
+}
+
+ssize_t intfstream_write(intfstream_internal_t *intf,
+      const void *s, size_t len)
+{
+   if (!intf)
+      return 0;
+
+   switch (intf->type)
+   {
+      case INTFSTREAM_FILE:
+         return filestream_write(intf->file.fp, s, len);
+      case INTFSTREAM_MEMORY:
+         return memstream_write(intf->memory.fp, s, len);
+   }
+
+   return 0;
+}
+
+char *intfstream_gets(intfstream_internal_t *intf,
+      char *buffer, size_t len)
+{
+   if (!intf)
+      return NULL;
+
+   switch (intf->type)
+   {
+      case INTFSTREAM_FILE:
+         /* unimplemented */
+         break;
+      case INTFSTREAM_MEMORY:
+         return memstream_gets(intf->memory.fp, buffer, len);
+   }
+
+   return NULL;
+}
+
+int intfstream_getc(intfstream_internal_t *intf)
+{
+   if (!intf)
+      return 0;
+
+   switch (intf->type)
+   {
+      case INTFSTREAM_FILE:
+         /* unimplemented */
+         break;
+      case INTFSTREAM_MEMORY:
+         return memstream_getc(intf->memory.fp);
+   }
+
+   return 0;
+}
+
+int intfstream_tell(intfstream_internal_t *intf)
+{
+   if (!intf)
+      return -1;
+
+   switch (intf->type)
+   {
+      case INTFSTREAM_FILE:
+         return filestream_tell(intf->file.fp);
+      case INTFSTREAM_MEMORY:
+         return memstream_pos(intf->memory.fp);
+   }
+
+   return -1;
+}
+
+void intfstream_rewind(intfstream_internal_t *intf)
+{
+   switch (intf->type)
+   {
+      case INTFSTREAM_FILE:
+         filestream_rewind(intf->file.fp);
+         break;
+      case INTFSTREAM_MEMORY:
+         memstream_rewind(intf->memory.fp);
+         break;
+   }
+}
+
+void intfstream_putc(intfstream_internal_t *intf, int c)
+{
+   if (!intf)
+      return;
+
+   switch (intf->type)
+   {
+      case INTFSTREAM_FILE:
+         filestream_putc(intf->file.fp, c);
+         break;
+      case INTFSTREAM_MEMORY:
+         memstream_putc(intf->memory.fp, c);
+         break;
+   }
+}

desmume/src/libretro-common/streams/memory_stream.c

@@ -32,11 +32,19 @@ static size_t last_file_size = 0;
 
 struct memstream
 {
-   uint8_t *m_buf;
+   uint8_t *buf;
-   size_t m_size;
+   size_t size;
-   size_t m_ptr;
+   size_t ptr;
+   size_t max_ptr;
+   unsigned writing;
 };
 
+static void memstream_update_pos(memstream_t *stream)
+{
+   if (stream->ptr > stream->max_ptr)
+      stream->max_ptr = stream->ptr;
+}
+
 void memstream_set_buffer(uint8_t *buffer, size_t size)
 {
    g_buffer = buffer;
@@ -48,21 +56,27 @@ size_t memstream_get_last_size(void)
    return last_file_size;
 }
 
-static void memstream_init(memstream_t *stream, uint8_t *buffer, size_t max_size)
+static void memstream_init(memstream_t *stream,
+      uint8_t *buffer, size_t max_size, unsigned writing)
 {
-   stream->m_buf = buffer;
+   if (!stream)
-   stream->m_size = max_size;
+      return;
-   stream->m_ptr = 0;
+
+   stream->buf     = buffer;
+   stream->size    = max_size;
+   stream->ptr     = 0;
+   stream->max_ptr = 0;
+   stream->writing = writing;
 }
 
-memstream_t *memstream_open(void)
+memstream_t *memstream_open(unsigned writing)
 {
 	memstream_t *stream;
    if (!g_buffer || !g_size)
       return NULL;
 
    stream = (memstream_t*)calloc(1, sizeof(*stream));
-   memstream_init(stream, g_buffer, g_size);
+   memstream_init(stream, g_buffer, g_size, writing);
 
    g_buffer = NULL;
    g_size = 0;
@@ -71,29 +85,44 @@ memstream_t *memstream_open(void)
 
 void memstream_close(memstream_t *stream)
 {
-   last_file_size = stream->m_ptr;
+   if (!stream)
+      return;
+
+   last_file_size = stream->writing ? stream->max_ptr : stream->size;
    free(stream);
 }
 
 size_t memstream_read(memstream_t *stream, void *data, size_t bytes)
 {
-   size_t avail = stream->m_size - stream->m_ptr;
+   size_t avail = 0;
+
+   if (!stream)
+      return 0;
+   
+   avail = stream->size - stream->ptr;
    if (bytes > avail)
       bytes = avail;
 
-   memcpy(data, stream->m_buf + stream->m_ptr, bytes);
+   memcpy(data, stream->buf + stream->ptr, bytes);
-   stream->m_ptr += bytes;
+   stream->ptr += bytes;
+   memstream_update_pos(stream);
    return bytes;
 }
 
 size_t memstream_write(memstream_t *stream, const void *data, size_t bytes)
 {
-   size_t avail = stream->m_size - stream->m_ptr;
+   size_t avail = 0;
+
+   if (!stream)
+      return 0;
+   
+   avail = stream->size - stream->ptr;
    if (bytes > avail)
       bytes = avail;
 
-   memcpy(stream->m_buf + stream->m_ptr, data, bytes);
+   memcpy(stream->buf + stream->ptr, data, bytes);
-   stream->m_ptr += bytes;
+   stream->ptr += bytes;
+   memstream_update_pos(stream);
    return bytes;
 }
 
@@ -107,26 +136,32 @@ int memstream_seek(memstream_t *stream, int offset, int whence)
          ptr = offset;
          break;
       case SEEK_CUR:
-         ptr = stream->m_ptr + offset;
+         ptr = stream->ptr + offset;
          break;
       case SEEK_END:
-         ptr = stream->m_size + offset;
+         ptr = (stream->writing ? stream->max_ptr : stream->size) + offset;
          break;
       default:
          return -1;
    }
 
-   if (ptr <= stream->m_size)
+   if (ptr <= stream->size)
    {
-      stream->m_ptr = ptr;
+      stream->ptr = ptr;
       return 0;
    }
+
    return -1;
 }
 
+void memstream_rewind(memstream_t *stream)
+{
+   memstream_seek(stream, 0L, SEEK_SET);
+}
+
 size_t memstream_pos(memstream_t *stream)
 {
-   return stream->m_ptr;
+   return stream->ptr;
 }
 
 char *memstream_gets(memstream_t *stream, char *buffer, size_t len)
@@ -136,7 +171,20 @@ char *memstream_gets(memstream_t *stream, char *buffer, size_t len)
 
 int memstream_getc(memstream_t *stream)
 {
-   if (stream->m_ptr >= stream->m_size)
+   int ret = 0;
+   if (stream->ptr >= stream->size)
       return EOF;
-   return stream->m_buf[stream->m_ptr++];
+   ret = stream->buf[stream->ptr++];
+
+   memstream_update_pos(stream);
+
+   return ret;
+}
+
+void memstream_putc(memstream_t *stream, int c)
+{
+   if (stream->ptr < stream->size)
+      stream->buf[stream->ptr++] = c;
+
+   memstream_update_pos(stream);
 }