diff options
Diffstat (limited to 'vcs-svn/svndiff.c')
| -rw-r--r-- | vcs-svn/svndiff.c | 46 |
1 files changed, 35 insertions, 11 deletions
diff --git a/vcs-svn/svndiff.c b/vcs-svn/svndiff.c index b7c2c8b..175168f 100644 --- a/vcs-svn/svndiff.c +++ b/vcs-svn/svndiff.c @@ -24,6 +24,17 @@ #define VLI_DIGIT_MASK 0x7f #define VLI_BITS_PER_DIGIT 7 +struct window { + struct strbuf data; +}; + +#define WINDOW_INIT { STRBUF_INIT } + +static void window_release(struct window *ctx) +{ + strbuf_release(&ctx->data); +} + static int error_short_read(struct line_buffer *input) { if (buffer_ferror(input)) @@ -31,24 +42,30 @@ static int error_short_read(struct line_buffer *input) return error("invalid delta: unexpected end of file"); } +static int read_chunk(struct line_buffer *delta, off_t *delta_len, + struct strbuf *buf, size_t len) +{ + strbuf_reset(buf); + if (len > *delta_len || + buffer_read_binary(delta, buf, len) != len) + return error_short_read(delta); + *delta_len -= buf->len; + return 0; +} + static int read_magic(struct line_buffer *in, off_t *len) { static const char magic[] = {'S', 'V', 'N', '\0'}; struct strbuf sb = STRBUF_INIT; - if (*len < sizeof(magic) || - buffer_read_binary(in, &sb, sizeof(magic)) != sizeof(magic)) { - error_short_read(in); + if (read_chunk(in, len, &sb, sizeof(magic))) { strbuf_release(&sb); return -1; } - if (memcmp(sb.buf, magic, sizeof(magic))) { strbuf_release(&sb); return error("invalid delta: unrecognized file type"); } - - *len -= sizeof(magic); strbuf_release(&sb); return 0; } @@ -98,6 +115,7 @@ static int read_length(struct line_buffer *in, size_t *result, off_t *len) static int apply_one_window(struct line_buffer *delta, off_t *delta_len) { + struct window ctx = WINDOW_INIT; size_t out_len; size_t instructions_len; size_t data_len; @@ -107,12 +125,18 @@ static int apply_one_window(struct line_buffer *delta, off_t *delta_len) if (read_length(delta, &out_len, delta_len) || read_length(delta, &instructions_len, delta_len) || read_length(delta, &data_len, delta_len)) - return -1; - if (instructions_len) - return error("What do you think I am? A delta applier?"); - if (data_len) - return error("No support for inline data yet"); + goto error_out; + if (instructions_len) { + error("What do you think I am? A delta applier?"); + goto error_out; + } + if (read_chunk(delta, delta_len, &ctx.data, data_len)) + goto error_out; + window_release(&ctx); return 0; +error_out: + window_release(&ctx); + return -1; } int svndiff0_apply(struct line_buffer *delta, off_t delta_len, |