1 files changed, 43 insertions(+), 0 deletions(-)

M cbits/transcode.c

@@ 382,3 382,46 @@ bool encodeFontSet(cmp_ctx_t *bytes, FcFontSet *data) {
     }
     return true;
 }
+
+struct bytes {
+    uint8_t *start;
+    size_t offset;
+    size_t length;
+};
+
+bool bytes_reader(struct cmp_ctx_s *ctx, void *data, size_t limit) {
+    struct bytes *bytes = ctx->buf;
+    if (bytes->offset + limit > bytes->length) return false;
+    data = bytes->start + bytes->offset;
+    bytes->offset += limit;
+    return true;
+}
+
+bool bytes_skipper(struct cmp_ctx_s *ctx, size_t count) {
+    struct bytes *bytes = ctx->buf;
+    if (bytes->offset + count > bytes->length) return false;
+    bytes->offset += count;
+    return true;
+}
+
+size_t bytes_writer(struct cmp_ctx_s *ctx, const void *data, size_t count) {
+    struct bytes *bytes = ctx->buf;
+    if (bytes->offset + count > bytes->length) return 0;
+    memcpy(bytes->start + bytes->offset, data, count);
+    bytes->offset += count;
+    return count;
+}
+
+void cmp_bytes_init(cmp_ctx_t *ctx, uint8_t *buf, size_t length) {
+    struct bytes *inner = malloc(sizeof(struct bytes));
+    inner->start = buf;
+    inner->offset = 0;
+    inner->length = length;
+    cmp_init(ctx, inner, bytes_reader, bytes_skipper, bytes_writer);
+}
+
+void cmp_bytes_free(cmp_ctx_t *ctx) {
+    struct bytes *bytes = ctx->buf;
+    free(bytes->start);
+    free(bytes);
+}