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common: add SpiceBuffer - based on qemu-vnc Buffer

Browse Source 
https://bugs.freedesktop.org/show_bug.cgi?id=34795
This commit is contained in:
Marc-André Lureau 2011-02-09 15:11:22 +01:00
parent 2ced8996c8
commit 2bbb4fca0c
2 changed files with 70 additions and 0 deletions
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53
common/mem.c
View File

@ -237,3 +237,56 @@ void spice_chunks_linearize(SpiceChunks *chunks)
chunks->chunk[0].len = chunks->data_size;
}
}
void spice_buffer_reserve(SpiceBuffer *buffer, size_t len)
{
if ((buffer->capacity - buffer->offset) < len) {
buffer->capacity += (len + 1024);
buffer->buffer = (uint8_t*)spice_realloc(buffer->buffer, buffer->capacity);
}
}
int spice_buffer_empty(SpiceBuffer *buffer)
{
return buffer->offset == 0;
}
uint8_t *spice_buffer_end(SpiceBuffer *buffer)
{
return buffer->buffer + buffer->offset;
}
void spice_buffer_reset(SpiceBuffer *buffer)
{
buffer->offset = 0;
}
void spice_buffer_free(SpiceBuffer *buffer)
{
free(buffer->buffer);
buffer->offset = 0;
buffer->capacity = 0;
buffer->buffer = NULL;
}
void spice_buffer_append(SpiceBuffer *buffer, const void *data, size_t len)
{
spice_buffer_reserve(buffer, len);
memcpy(buffer->buffer + buffer->offset, data, len);
buffer->offset += len;
}
size_t spice_buffer_copy(SpiceBuffer *buffer, void *dest, size_t len)
{
len = MIN(buffer->offset, len);
memcpy(dest, buffer->buffer, len);
return len;
}
size_t spice_buffer_remove(SpiceBuffer *buffer, size_t len)
{
len = MIN(buffer->offset, len);
memmove(buffer->buffer, buffer->buffer + len, buffer->offset - len);
buffer->offset -= len;
return len;
}

17
common/mem.h
View File

@ -39,6 +39,13 @@ typedef struct SpiceChunks {
SpiceChunk chunk[0];
} SpiceChunks;
typedef struct SpiceBuffer
{
size_t capacity;
size_t offset;
uint8_t *buffer;
} SpiceBuffer;
char *spice_strdup(const char *str) SPICE_GNUC_MALLOC;
char *spice_strndup(const char *str, size_t n_bytes) SPICE_GNUC_MALLOC;
void *spice_memdup(const void *mem, size_t n_bytes) SPICE_GNUC_MALLOC;
@ -103,4 +110,14 @@ size_t spice_strnlen(const char *str, size_t max_len);
#define spice_new0(struct_type, n_structs) _SPICE_NEW(struct_type, n_structs, malloc0)
#define spice_renew(struct_type, mem, n_structs) _SPICE_RENEW(struct_type, mem, n_structs, realloc)
/* Buffer management */
void spice_buffer_reserve(SpiceBuffer *buffer, size_t len);
int spice_buffer_empty(SpiceBuffer *buffer);
uint8_t *spice_buffer_end(SpiceBuffer *buffer);
void spice_buffer_reset(SpiceBuffer *buffer);
void spice_buffer_free(SpiceBuffer *buffer);
void spice_buffer_append(SpiceBuffer *buffer, const void *data, size_t len);
size_t spice_buffer_copy(SpiceBuffer *buffer, void *dest, size_t len);
size_t spice_buffer_remove(SpiceBuffer *buffer, size_t len);
#endif