/* SPDX-License-Identifier: GPL-2.0-only */ #include <commonlib/endian.h> #include <commonlib/iobuf.h> #include <string.h> static int ibuf_check_size(const struct ibuf *ib, size_t sz) { if (ibuf_remaining(ib) < sz) return -1; return 0; } void ibuf_init(struct ibuf *ib, const void *b, size_t sz) { ib->b = b; ib->n_read = 0; ib->capacity = sz; } void ibuf_from_obuf(struct ibuf *ib, const struct obuf *ob) { ibuf_init(ib, ob->b, ob->n_written); } int ibuf_splice(const struct ibuf *src, struct ibuf *dst, size_t off, size_t sz) { size_t end = off + sz; size_t capacity = ibuf_capacity(src); size_t nr_read = ibuf_nr_read(src); if (end < off || end < sz || end > capacity) return -1; ibuf_init(dst, &src->b[off], sz); /* Handle previously read data in src. */ if (off < nr_read) dst->n_read = nr_read - off; return 0; } int ibuf_splice_current(const struct ibuf *src, struct ibuf *dst, size_t sz) { return ibuf_splice(src, dst, ibuf_nr_read(src), sz); } int ibuf_split(const struct ibuf *src, struct ibuf *a, struct ibuf *b, size_t boundary) { if (ibuf_splice(src, a, 0, boundary)) return -1; return ibuf_splice(src, b, boundary, ibuf_capacity(src) - boundary); } const void *ibuf_oob_drain(struct ibuf *ib, size_t sz) { const void *b; if (ibuf_check_size(ib, sz)) return NULL; b = &ib->b[ib->n_read]; ib->n_read += sz; return b; } int ibuf_read(struct ibuf *ib, void *data, size_t sz) { const void *b = ibuf_oob_drain(ib, sz); if (b == NULL) return -1; memcpy(data, b, sz); return 0; } int ibuf_read_be8(struct ibuf *ib, uint8_t *v) { size_t sz = sizeof(*v); if (ibuf_check_size(ib, sz)) return -1; *v = read_at_be8(ib->b, ib->n_read); ib->n_read += sz; return 0; } int ibuf_read_be16(struct ibuf *ib, uint16_t *v) { size_t sz = sizeof(*v); if (ibuf_check_size(ib, sz)) return -1; *v = read_at_be16(ib->b, ib->n_read); ib->n_read += sz; return 0; } int ibuf_read_be32(struct ibuf *ib, uint32_t *v) { size_t sz = sizeof(*v); if (ibuf_check_size(ib, sz)) return -1; *v = read_at_be32(ib->b, ib->n_read); ib->n_read += sz; return 0; } int ibuf_read_be64(struct ibuf *ib, uint64_t *v) { size_t sz = sizeof(*v); if (ibuf_check_size(ib, sz)) return -1; *v = read_at_be64(ib->b, ib->n_read); ib->n_read += sz; return 0; } int ibuf_read_le8(struct ibuf *ib, uint8_t *v) { size_t sz = sizeof(*v); if (ibuf_check_size(ib, sz)) return -1; *v = read_at_le8(ib->b, ib->n_read); ib->n_read += sz; return 0; } int ibuf_read_le16(struct ibuf *ib, uint16_t *v) { size_t sz = sizeof(*v); if (ibuf_check_size(ib, sz)) return -1; *v = read_at_le16(ib->b, ib->n_read); ib->n_read += sz; return 0; } int ibuf_read_le32(struct ibuf *ib, uint32_t *v) { size_t sz = sizeof(*v); if (ibuf_check_size(ib, sz)) return -1; *v = read_at_le32(ib->b, ib->n_read); ib->n_read += sz; return 0; } int ibuf_read_le64(struct ibuf *ib, uint64_t *v) { size_t sz = sizeof(*v); if (ibuf_check_size(ib, sz)) return -1; *v = read_at_le64(ib->b, ib->n_read); ib->n_read += sz; return 0; } int ibuf_read_n8(struct ibuf *ib, uint8_t *v) { return ibuf_read(ib, v, sizeof(*v)); } int ibuf_read_n16(struct ibuf *ib, uint16_t *v) { return ibuf_read(ib, v, sizeof(*v)); } int ibuf_read_n32(struct ibuf *ib, uint32_t *v) { return ibuf_read(ib, v, sizeof(*v)); } int ibuf_read_n64(struct ibuf *ib, uint64_t *v) { return ibuf_read(ib, v, sizeof(*v)); } static int obuf_check_size(const struct obuf *ob, size_t sz) { if (obuf_remaining(ob) < sz) return -1; return 0; } void obuf_init(struct obuf *ob, void *b, size_t sz) { ob->b = b; ob->n_written = 0; ob->capacity = sz; } int obuf_splice(const struct obuf *src, struct obuf *dst, size_t off, size_t sz) { size_t end = off + sz; size_t capacity = obuf_capacity(src); size_t nr_written = obuf_nr_written(src); if (end < off || end < sz || end > capacity) return -1; obuf_init(dst, &src->b[off], sz); /* Handle previously written data in src. */ if (off < nr_written) dst->n_written = nr_written - off; return 0; } int obuf_splice_current(const struct obuf *src, struct obuf *dst, size_t sz) { return obuf_splice(src, dst, obuf_nr_written(src), sz); } int obuf_split(const struct obuf *src, struct obuf *a, struct obuf *b, size_t boundary) { if (obuf_splice(src, a, 0, boundary)) return -1; return obuf_splice(src, b, boundary, obuf_capacity(src) - boundary); } void *obuf_oob_fill(struct obuf *ob, size_t sz) { void *b; if (obuf_check_size(ob, sz)) return NULL; b = &ob->b[ob->n_written]; ob->n_written += sz; return b; } int obuf_write(struct obuf *ob, const void *data, size_t sz) { void *b; b = obuf_oob_fill(ob, sz); if (b == NULL) return -1; memcpy(b, data, sz); return 0; } int obuf_write_be8(struct obuf *ob, uint8_t v) { size_t sz = sizeof(v); if (obuf_check_size(ob, sz)) return -1; write_at_be8(ob->b, v, ob->n_written); ob->n_written += sz; return 0; } int obuf_write_be16(struct obuf *ob, uint16_t v) { size_t sz = sizeof(v); if (obuf_check_size(ob, sz)) return -1; write_at_be16(ob->b, v, ob->n_written); ob->n_written += sz; return 0; } int obuf_write_be32(struct obuf *ob, uint32_t v) { size_t sz = sizeof(v); if (obuf_check_size(ob, sz)) return -1; write_at_be32(ob->b, v, ob->n_written); ob->n_written += sz; return 0; } int obuf_write_be64(struct obuf *ob, uint64_t v) { size_t sz = sizeof(v); if (obuf_check_size(ob, sz)) return -1; write_at_be64(ob->b, v, ob->n_written); ob->n_written += sz; return 0; } int obuf_write_le8(struct obuf *ob, uint8_t v) { size_t sz = sizeof(v); if (obuf_check_size(ob, sz)) return -1; write_at_le8(ob->b, v, ob->n_written); ob->n_written += sz; return 0; } int obuf_write_le16(struct obuf *ob, uint16_t v) { size_t sz = sizeof(v); if (obuf_check_size(ob, sz)) return -1; write_at_le16(ob->b, v, ob->n_written); ob->n_written += sz; return 0; } int obuf_write_le32(struct obuf *ob, uint32_t v) { size_t sz = sizeof(v); if (obuf_check_size(ob, sz)) return -1; write_at_le32(ob->b, v, ob->n_written); ob->n_written += sz; return 0; } int obuf_write_le64(struct obuf *ob, uint64_t v) { size_t sz = sizeof(v); if (obuf_check_size(ob, sz)) return -1; write_at_le64(ob->b, v, ob->n_written); ob->n_written += sz; return 0; } int obuf_write_n8(struct obuf *ob, uint8_t v) { return obuf_write(ob, &v, sizeof(v)); } int obuf_write_n16(struct obuf *ob, uint16_t v) { return obuf_write(ob, &v, sizeof(v)); } int obuf_write_n32(struct obuf *ob, uint32_t v) { return obuf_write(ob, &v, sizeof(v)); } int obuf_write_n64(struct obuf *ob, uint64_t v) { return obuf_write(ob, &v, sizeof(v)); } const void *obuf_contents(const struct obuf *ob, size_t *sz) { *sz = obuf_nr_written(ob); return ob->b; }