Externals: Update minizip to minizip-ng version 3.0.4.

Externals/minizip/mz_strm_mem.c

@@ -0,0 +1,272 @@
+/* mz_strm_mem.c -- Stream for memory access
+   part of the minizip-ng project
+
+   This interface is designed to access memory rather than files.
+   We do use a region of memory to put data in to and take it out of.
+
+   Based on Unzip ioapi.c version 0.22, May 19th, 2003
+
+   Copyright (C) 2010-2021 Nathan Moinvaziri
+     https://github.com/zlib-ng/minizip-ng
+   Copyright (C) 2003 Justin Fletcher
+   Copyright (C) 1998-2003 Gilles Vollant
+     https://www.winimage.com/zLibDll/minizip.html
+
+   This program is distributed under the terms of the same license as zlib.
+   See the accompanying LICENSE file for the full text of the license.
+*/
+
+
+#include "mz.h"
+#include "mz_strm.h"
+#include "mz_strm_mem.h"
+
+/***************************************************************************/
+
+static mz_stream_vtbl mz_stream_mem_vtbl = {
+    mz_stream_mem_open,
+    mz_stream_mem_is_open,
+    mz_stream_mem_read,
+    mz_stream_mem_write,
+    mz_stream_mem_tell,
+    mz_stream_mem_seek,
+    mz_stream_mem_close,
+    mz_stream_mem_error,
+    mz_stream_mem_create,
+    mz_stream_mem_delete,
+    NULL,
+    NULL
+};
+
+/***************************************************************************/
+
+typedef struct mz_stream_mem_s {
+    mz_stream   stream;
+    int32_t     mode;
+    uint8_t     *buffer;    /* Memory buffer pointer */
+    int32_t     size;       /* Size of the memory buffer */
+    int32_t     limit;      /* Furthest we've written */
+    int32_t     position;   /* Current position in the memory */
+    int32_t     grow_size;  /* Size to grow when full */
+} mz_stream_mem;
+
+/***************************************************************************/
+
+static int32_t mz_stream_mem_set_size(void *stream, int32_t size) {
+    mz_stream_mem *mem = (mz_stream_mem *)stream;
+    int32_t new_size = size;
+    uint8_t *new_buf = NULL;
+
+
+    new_buf = (uint8_t *)MZ_ALLOC((uint32_t)new_size);
+    if (new_buf == NULL)
+        return MZ_BUF_ERROR;
+
+    if (mem->buffer) {
+        memcpy(new_buf, mem->buffer, mem->size);
+        MZ_FREE(mem->buffer);
+    }
+
+    mem->buffer = new_buf;
+    mem->size = new_size;
+    return MZ_OK;
+}
+
+int32_t mz_stream_mem_open(void *stream, const char *path, int32_t mode) {
+    mz_stream_mem *mem = (mz_stream_mem *)stream;
+    int32_t err = MZ_OK;
+
+    MZ_UNUSED(path);
+
+    mem->mode = mode;
+    mem->limit = 0;
+    mem->position = 0;
+
+    if (mem->mode & MZ_OPEN_MODE_CREATE)
+        err = mz_stream_mem_set_size(stream, mem->grow_size);
+    else
+        mem->limit = mem->size;
+
+    return err;
+}
+
+int32_t mz_stream_mem_is_open(void *stream) {
+    mz_stream_mem *mem = (mz_stream_mem *)stream;
+    if (mem->buffer == NULL)
+        return MZ_OPEN_ERROR;
+    return MZ_OK;
+}
+
+int32_t mz_stream_mem_read(void *stream, void *buf, int32_t size) {
+    mz_stream_mem *mem = (mz_stream_mem *)stream;
+
+    if (size > mem->size - mem->position)
+        size = mem->size - mem->position;
+    if (mem->position + size > mem->limit)
+        size = mem->limit - mem->position;
+
+    if (size <= 0)
+        return 0;
+
+    memcpy(buf, mem->buffer + mem->position, size);
+    mem->position += size;
+
+    return size;
+}
+
+int32_t mz_stream_mem_write(void *stream, const void *buf, int32_t size) {
+    mz_stream_mem *mem = (mz_stream_mem *)stream;
+    int32_t new_size = 0;
+    int32_t err = MZ_OK;
+
+    if (size == 0)
+        return size;
+
+    if (size > mem->size - mem->position) {
+        if (mem->mode & MZ_OPEN_MODE_CREATE) {
+            new_size = mem->size;
+            if (size < mem->grow_size)
+                new_size += mem->grow_size;
+            else
+                new_size += size;
+
+            err = mz_stream_mem_set_size(stream, new_size);
+            if (err != MZ_OK)
+                return err;
+        } else {
+            size = mem->size - mem->position;
+        }
+    }
+
+    memcpy(mem->buffer + mem->position, buf, size);
+
+    mem->position += size;
+    if (mem->position > mem->limit)
+        mem->limit = mem->position;
+
+    return size;
+}
+
+int64_t mz_stream_mem_tell(void *stream) {
+    mz_stream_mem *mem = (mz_stream_mem *)stream;
+    return mem->position;
+}
+
+int32_t mz_stream_mem_seek(void *stream, int64_t offset, int32_t origin) {
+    mz_stream_mem *mem = (mz_stream_mem *)stream;
+    int64_t new_pos = 0;
+    int32_t err = MZ_OK;
+
+    switch (origin) {
+    case MZ_SEEK_CUR:
+        new_pos = mem->position + offset;
+        break;
+    case MZ_SEEK_END:
+        new_pos = mem->limit + offset;
+        break;
+    case MZ_SEEK_SET:
+        new_pos = offset;
+        break;
+    default:
+        return MZ_SEEK_ERROR;
+    }
+
+    if (new_pos > mem->size) {
+        if ((mem->mode & MZ_OPEN_MODE_CREATE) == 0)
+            return MZ_SEEK_ERROR;
+
+        err = mz_stream_mem_set_size(stream, (int32_t)new_pos);
+        if (err != MZ_OK)
+            return err;
+    } else if (new_pos < 0) {
+        return MZ_SEEK_ERROR;
+    }
+
+    mem->position = (int32_t)new_pos;
+    return MZ_OK;
+}
+
+int32_t mz_stream_mem_close(void *stream) {
+    MZ_UNUSED(stream);
+
+    /* We never return errors */
+    return MZ_OK;
+}
+
+int32_t mz_stream_mem_error(void *stream) {
+    MZ_UNUSED(stream);
+
+    /* We never return errors */
+    return MZ_OK;
+}
+
+void mz_stream_mem_set_buffer(void *stream, void *buf, int32_t size) {
+    mz_stream_mem *mem = (mz_stream_mem *)stream;
+    mem->buffer = (uint8_t *)buf;
+    mem->size = size;
+    mem->limit = size;
+}
+
+int32_t mz_stream_mem_get_buffer(void *stream, const void **buf) {
+    return mz_stream_mem_get_buffer_at(stream, 0, buf);
+}
+
+int32_t mz_stream_mem_get_buffer_at(void *stream, int64_t position, const void **buf) {
+    mz_stream_mem *mem = (mz_stream_mem *)stream;
+    if (buf == NULL || position < 0 || mem->size < position || mem->buffer == NULL)
+        return MZ_SEEK_ERROR;
+    *buf = mem->buffer + position;
+    return MZ_OK;
+}
+
+int32_t mz_stream_mem_get_buffer_at_current(void *stream, const void **buf) {
+    mz_stream_mem *mem = (mz_stream_mem *)stream;
+    return mz_stream_mem_get_buffer_at(stream, mem->position, buf);
+}
+
+void mz_stream_mem_get_buffer_length(void *stream, int32_t *length) {
+    mz_stream_mem *mem = (mz_stream_mem *)stream;
+    *length = mem->limit;
+}
+
+void mz_stream_mem_set_buffer_limit(void *stream, int32_t limit) {
+    mz_stream_mem *mem = (mz_stream_mem *)stream;
+    mem->limit = limit;
+}
+
+void mz_stream_mem_set_grow_size(void *stream, int32_t grow_size) {
+    mz_stream_mem *mem = (mz_stream_mem *)stream;
+    mem->grow_size = grow_size;
+}
+
+void *mz_stream_mem_create(void **stream) {
+    mz_stream_mem *mem = NULL;
+
+    mem = (mz_stream_mem *)MZ_ALLOC(sizeof(mz_stream_mem));
+    if (mem != NULL) {
+        memset(mem, 0, sizeof(mz_stream_mem));
+        mem->stream.vtbl = &mz_stream_mem_vtbl;
+        mem->grow_size = 4096;
+    }
+    if (stream != NULL)
+        *stream = mem;
+
+    return mem;
+}
+
+void mz_stream_mem_delete(void **stream) {
+    mz_stream_mem *mem = NULL;
+    if (stream == NULL)
+        return;
+    mem = (mz_stream_mem *)*stream;
+    if (mem != NULL) {
+        if ((mem->mode & MZ_OPEN_MODE_CREATE) && (mem->buffer != NULL))
+            MZ_FREE(mem->buffer);
+        MZ_FREE(mem);
+    }
+    *stream = NULL;
+}
+
+void *mz_stream_mem_get_interface(void) {
+    return (void *)&mz_stream_mem_vtbl;
+}