Mercurial > hg > dav / file diff

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/buffer.c	Fri Nov 30 21:18:13 2012 +0100
@@ -0,0 +1,204 @@
+#include "buffer.h"
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+
+UcxBuffer *ucx_buffer_new(void *space, size_t size, int flags) {
+    UcxBuffer *buffer = (UcxBuffer*) malloc(sizeof(UcxBuffer));
+    if (buffer) {
+        buffer->flags = flags;
+        if (!space) {
+            buffer->space = malloc(size);
+            if (!buffer->space) {
+                free(buffer);
+                return NULL;
+            }
+            memset(buffer->space, 0, size);
+            buffer->flags |= UCX_BUFFER_AUTOFREE;
+        } else {
+            buffer->space = space;
+        }
+        buffer->capacity = size;
+        buffer->size = 0;
+
+        buffer->pos = 0;
+    }
+
+    return buffer;
+}
+
+void ucx_buffer_free(UcxBuffer *buffer) {
+    if ((buffer->flags & UCX_BUFFER_AUTOFREE) == UCX_BUFFER_AUTOFREE) {
+        free(buffer->space);
+    }
+    free(buffer);
+}
+
+UcxBuffer* ucx_buffer_extract(
+        UcxBuffer *src, size_t start, size_t length, int flags) {
+    if(src->size == 0) {
+        return NULL;
+    }
+    if (length == 0) {
+        length = src->size - start;
+    }
+    if (start+length > src->size) {
+        return NULL;
+    }
+
+    UcxBuffer *dst = (UcxBuffer*) malloc(sizeof(UcxBuffer));
+    if (dst) {
+        dst->space = malloc(length);
+        if (!dst->space) {
+            free(dst);
+            return NULL;
+        }
+        dst->capacity = length;
+        dst->size = length;
+        dst->flags = flags | UCX_BUFFER_AUTOFREE;
+        dst->pos = 0;
+        memcpy(dst->space, src->space+start, length);
+    }
+    return dst;
+}
+
+int ucx_buffer_seek(UcxBuffer *buffer, off_t offset, int whence) {
+    off_t npos;
+    switch (whence) {
+    case SEEK_SET:
+        npos = 0;
+        break;
+    case SEEK_CUR:
+        npos = buffer->pos;
+        break;
+    case SEEK_END:
+        npos = buffer->size;
+        break;
+    }
+
+    npos += offset;
+    
+    if (npos < 0 || npos > buffer->size) {
+        return -1;
+    } else {
+        buffer->pos = npos;
+        return 0;
+    }
+
+}
+
+int ucx_buffer_eof(UcxBuffer *buffer) {
+    return buffer->pos >= buffer->size;
+}
+
+int ucx_buffer_extend(UcxBuffer *buffer, size_t len) {
+    size_t newcap = buffer->capacity;
+    while (buffer->pos + len > newcap) newcap <<= 1;
+    
+    char *newspace = realloc(buffer->space, newcap);
+    if (newspace) {
+        memset(newspace+buffer->size, 0, newcap-buffer->size);
+        buffer->space = newspace;
+        buffer->capacity = newcap;
+    } else {
+        return -1;
+    }
+    
+    return 0;
+}
+
+size_t ucx_buffer_write(const void *ptr, size_t size, size_t nitems,
+        UcxBuffer *buffer) {
+    size_t len = size * nitems;
+    if (buffer->pos + len > buffer->capacity) {
+        if ((buffer->flags & UCX_BUFFER_AUTOEXTEND) == UCX_BUFFER_AUTOEXTEND) {
+            if(ucx_buffer_extend(buffer, len)) {
+                return -1;
+            }
+        } else {
+            len = buffer->capacity - buffer->pos;
+            if (size > 1) len -= len%size;
+        }
+    }
+    
+    if (len <= 0) {
+        return len;
+    }
+    
+    memcpy(buffer->space + buffer->pos, ptr, len);
+    buffer->pos += len;
+    if(buffer->pos > buffer->size) {
+        buffer->size = buffer->pos;
+    }
+    
+    return len / size;
+}
+
+size_t ucx_buffer_read(void *ptr, size_t size, size_t nitems,
+        UcxBuffer *buffer) {
+    size_t len = size * nitems;
+    if (buffer->pos + len > buffer->size) {
+        len = buffer->size - buffer->pos;
+        if (size > 1) len -= len%size;
+    }
+    
+    if (len <= 0) {
+        return len;
+    }
+    
+    memcpy(ptr, buffer->space + buffer->pos, len);
+    buffer->pos += len;
+    
+    return len / size;
+}
+
+int ucx_buffer_putc(UcxBuffer *buffer, int c) {
+    if(buffer->pos >= buffer->capacity) {
+        if ((buffer->flags & UCX_BUFFER_AUTOEXTEND) == UCX_BUFFER_AUTOEXTEND) {
+            if(ucx_buffer_extend(buffer, 1)) {
+                return EOF;
+            }
+        } else {
+            return EOF;
+        }
+    }
+    
+    c &= 0xFF;
+    buffer->space[buffer->pos] = (char) c;
+    buffer->pos++;
+    if(buffer->pos > buffer->size) {
+        buffer->size = buffer->pos;
+    }
+    return c;
+}
+
+int ucx_buffer_getc(UcxBuffer *buffer) {
+    if (ucx_buffer_eof(buffer)) {
+        return EOF;
+    } else {
+        int c = buffer->space[buffer->pos];
+        buffer->pos++;
+        return c;
+    }
+}
+
+size_t ucx_buffer_generic_copy(void *s1, void *s2,
+        read_func readfnc, write_func writefnc, size_t bufsize) {
+    size_t ncp = 0;
+    char *buf = malloc(bufsize);
+    if(buf == NULL) {
+        return 0;
+    }
+    
+    size_t r;
+    while((r = readfnc(buf, 1, bufsize, s1)) != 0) {
+        r = writefnc(buf, 1, r, s2);
+        ncp += r;
+        if(r == 0) {
+            break;
+        }
+    }
+    
+    free(buf);
+    return ncp;
+}